1 /* Common target dependent code for GDB on ARM systems.
3 Copyright (C) 1988-2018 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include <ctype.h> /* XXX for isupper (). */
29 #include "dis-asm.h" /* For register styles. */
32 #include "reggroups.h"
33 #include "target-float.h"
35 #include "arch-utils.h"
37 #include "frame-unwind.h"
38 #include "frame-base.h"
39 #include "trad-frame.h"
41 #include "dwarf2-frame.h"
43 #include "prologue-value.h"
45 #include "target-descriptions.h"
46 #include "user-regs.h"
47 #include "observable.h"
50 #include "arch/arm-get-next-pcs.h"
52 #include "gdb/sim-arm.h"
55 #include "coff/internal.h"
61 #include "record-full.h"
64 #include "features/arm/arm-with-m.c"
65 #include "features/arm/arm-with-m-fpa-layout.c"
66 #include "features/arm/arm-with-m-vfp-d16.c"
67 #include "features/arm/arm-with-iwmmxt.c"
68 #include "features/arm/arm-with-vfpv2.c"
69 #include "features/arm/arm-with-vfpv3.c"
70 #include "features/arm/arm-with-neon.c"
78 /* Macros for setting and testing a bit in a minimal symbol that marks
79 it as Thumb function. The MSB of the minimal symbol's "info" field
80 is used for this purpose.
82 MSYMBOL_SET_SPECIAL Actually sets the "special" bit.
83 MSYMBOL_IS_SPECIAL Tests the "special" bit in a minimal symbol. */
85 #define MSYMBOL_SET_SPECIAL(msym) \
86 MSYMBOL_TARGET_FLAG_1 (msym) = 1
88 #define MSYMBOL_IS_SPECIAL(msym) \
89 MSYMBOL_TARGET_FLAG_1 (msym)
91 /* Per-objfile data used for mapping symbols. */
92 static const struct objfile_data
*arm_objfile_data_key
;
94 struct arm_mapping_symbol
99 typedef struct arm_mapping_symbol arm_mapping_symbol_s
;
100 DEF_VEC_O(arm_mapping_symbol_s
);
102 struct arm_per_objfile
104 VEC(arm_mapping_symbol_s
) **section_maps
;
107 /* The list of available "set arm ..." and "show arm ..." commands. */
108 static struct cmd_list_element
*setarmcmdlist
= NULL
;
109 static struct cmd_list_element
*showarmcmdlist
= NULL
;
111 /* The type of floating-point to use. Keep this in sync with enum
112 arm_float_model, and the help string in _initialize_arm_tdep. */
113 static const char *const fp_model_strings
[] =
123 /* A variable that can be configured by the user. */
124 static enum arm_float_model arm_fp_model
= ARM_FLOAT_AUTO
;
125 static const char *current_fp_model
= "auto";
127 /* The ABI to use. Keep this in sync with arm_abi_kind. */
128 static const char *const arm_abi_strings
[] =
136 /* A variable that can be configured by the user. */
137 static enum arm_abi_kind arm_abi_global
= ARM_ABI_AUTO
;
138 static const char *arm_abi_string
= "auto";
140 /* The execution mode to assume. */
141 static const char *const arm_mode_strings
[] =
149 static const char *arm_fallback_mode_string
= "auto";
150 static const char *arm_force_mode_string
= "auto";
152 /* The standard register names, and all the valid aliases for them. Note
153 that `fp', `sp' and `pc' are not added in this alias list, because they
154 have been added as builtin user registers in
155 std-regs.c:_initialize_frame_reg. */
160 } arm_register_aliases
[] = {
161 /* Basic register numbers. */
178 /* Synonyms (argument and variable registers). */
191 /* Other platform-specific names for r9. */
197 /* Names used by GCC (not listed in the ARM EABI). */
199 /* A special name from the older ATPCS. */
203 static const char *const arm_register_names
[] =
204 {"r0", "r1", "r2", "r3", /* 0 1 2 3 */
205 "r4", "r5", "r6", "r7", /* 4 5 6 7 */
206 "r8", "r9", "r10", "r11", /* 8 9 10 11 */
207 "r12", "sp", "lr", "pc", /* 12 13 14 15 */
208 "f0", "f1", "f2", "f3", /* 16 17 18 19 */
209 "f4", "f5", "f6", "f7", /* 20 21 22 23 */
210 "fps", "cpsr" }; /* 24 25 */
212 /* Holds the current set of options to be passed to the disassembler. */
213 static char *arm_disassembler_options
;
215 /* Valid register name styles. */
216 static const char **valid_disassembly_styles
;
218 /* Disassembly style to use. Default to "std" register names. */
219 static const char *disassembly_style
;
221 /* This is used to keep the bfd arch_info in sync with the disassembly
223 static void set_disassembly_style_sfunc (const char *, int,
224 struct cmd_list_element
*);
225 static void show_disassembly_style_sfunc (struct ui_file
*, int,
226 struct cmd_list_element
*,
229 static enum register_status
arm_neon_quad_read (struct gdbarch
*gdbarch
,
230 readable_regcache
*regcache
,
231 int regnum
, gdb_byte
*buf
);
232 static void arm_neon_quad_write (struct gdbarch
*gdbarch
,
233 struct regcache
*regcache
,
234 int regnum
, const gdb_byte
*buf
);
237 arm_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs
*self
);
240 /* get_next_pcs operations. */
241 static struct arm_get_next_pcs_ops arm_get_next_pcs_ops
= {
242 arm_get_next_pcs_read_memory_unsigned_integer
,
243 arm_get_next_pcs_syscall_next_pc
,
244 arm_get_next_pcs_addr_bits_remove
,
245 arm_get_next_pcs_is_thumb
,
249 struct arm_prologue_cache
251 /* The stack pointer at the time this frame was created; i.e. the
252 caller's stack pointer when this function was called. It is used
253 to identify this frame. */
256 /* The frame base for this frame is just prev_sp - frame size.
257 FRAMESIZE is the distance from the frame pointer to the
258 initial stack pointer. */
262 /* The register used to hold the frame pointer for this frame. */
265 /* Saved register offsets. */
266 struct trad_frame_saved_reg
*saved_regs
;
269 static CORE_ADDR
arm_analyze_prologue (struct gdbarch
*gdbarch
,
270 CORE_ADDR prologue_start
,
271 CORE_ADDR prologue_end
,
272 struct arm_prologue_cache
*cache
);
274 /* Architecture version for displaced stepping. This effects the behaviour of
275 certain instructions, and really should not be hard-wired. */
277 #define DISPLACED_STEPPING_ARCH_VERSION 5
279 /* Set to true if the 32-bit mode is in use. */
283 /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */
286 arm_psr_thumb_bit (struct gdbarch
*gdbarch
)
288 if (gdbarch_tdep (gdbarch
)->is_m
)
294 /* Determine if the processor is currently executing in Thumb mode. */
297 arm_is_thumb (struct regcache
*regcache
)
300 ULONGEST t_bit
= arm_psr_thumb_bit (regcache
->arch ());
302 cpsr
= regcache_raw_get_unsigned (regcache
, ARM_PS_REGNUM
);
304 return (cpsr
& t_bit
) != 0;
307 /* Determine if FRAME is executing in Thumb mode. */
310 arm_frame_is_thumb (struct frame_info
*frame
)
313 ULONGEST t_bit
= arm_psr_thumb_bit (get_frame_arch (frame
));
315 /* Every ARM frame unwinder can unwind the T bit of the CPSR, either
316 directly (from a signal frame or dummy frame) or by interpreting
317 the saved LR (from a prologue or DWARF frame). So consult it and
318 trust the unwinders. */
319 cpsr
= get_frame_register_unsigned (frame
, ARM_PS_REGNUM
);
321 return (cpsr
& t_bit
) != 0;
324 /* Callback for VEC_lower_bound. */
327 arm_compare_mapping_symbols (const struct arm_mapping_symbol
*lhs
,
328 const struct arm_mapping_symbol
*rhs
)
330 return lhs
->value
< rhs
->value
;
333 /* Search for the mapping symbol covering MEMADDR. If one is found,
334 return its type. Otherwise, return 0. If START is non-NULL,
335 set *START to the location of the mapping symbol. */
338 arm_find_mapping_symbol (CORE_ADDR memaddr
, CORE_ADDR
*start
)
340 struct obj_section
*sec
;
342 /* If there are mapping symbols, consult them. */
343 sec
= find_pc_section (memaddr
);
346 struct arm_per_objfile
*data
;
347 VEC(arm_mapping_symbol_s
) *map
;
348 struct arm_mapping_symbol map_key
= { memaddr
- obj_section_addr (sec
),
352 data
= (struct arm_per_objfile
*) objfile_data (sec
->objfile
,
353 arm_objfile_data_key
);
356 map
= data
->section_maps
[sec
->the_bfd_section
->index
];
357 if (!VEC_empty (arm_mapping_symbol_s
, map
))
359 struct arm_mapping_symbol
*map_sym
;
361 idx
= VEC_lower_bound (arm_mapping_symbol_s
, map
, &map_key
,
362 arm_compare_mapping_symbols
);
364 /* VEC_lower_bound finds the earliest ordered insertion
365 point. If the following symbol starts at this exact
366 address, we use that; otherwise, the preceding
367 mapping symbol covers this address. */
368 if (idx
< VEC_length (arm_mapping_symbol_s
, map
))
370 map_sym
= VEC_index (arm_mapping_symbol_s
, map
, idx
);
371 if (map_sym
->value
== map_key
.value
)
374 *start
= map_sym
->value
+ obj_section_addr (sec
);
375 return map_sym
->type
;
381 map_sym
= VEC_index (arm_mapping_symbol_s
, map
, idx
- 1);
383 *start
= map_sym
->value
+ obj_section_addr (sec
);
384 return map_sym
->type
;
393 /* Determine if the program counter specified in MEMADDR is in a Thumb
394 function. This function should be called for addresses unrelated to
395 any executing frame; otherwise, prefer arm_frame_is_thumb. */
398 arm_pc_is_thumb (struct gdbarch
*gdbarch
, CORE_ADDR memaddr
)
400 struct bound_minimal_symbol sym
;
402 arm_displaced_step_closure
*dsc
403 = ((arm_displaced_step_closure
* )
404 get_displaced_step_closure_by_addr (memaddr
));
406 /* If checking the mode of displaced instruction in copy area, the mode
407 should be determined by instruction on the original address. */
411 fprintf_unfiltered (gdb_stdlog
,
412 "displaced: check mode of %.8lx instead of %.8lx\n",
413 (unsigned long) dsc
->insn_addr
,
414 (unsigned long) memaddr
);
415 memaddr
= dsc
->insn_addr
;
418 /* If bit 0 of the address is set, assume this is a Thumb address. */
419 if (IS_THUMB_ADDR (memaddr
))
422 /* If the user wants to override the symbol table, let him. */
423 if (strcmp (arm_force_mode_string
, "arm") == 0)
425 if (strcmp (arm_force_mode_string
, "thumb") == 0)
428 /* ARM v6-M and v7-M are always in Thumb mode. */
429 if (gdbarch_tdep (gdbarch
)->is_m
)
432 /* If there are mapping symbols, consult them. */
433 type
= arm_find_mapping_symbol (memaddr
, NULL
);
437 /* Thumb functions have a "special" bit set in minimal symbols. */
438 sym
= lookup_minimal_symbol_by_pc (memaddr
);
440 return (MSYMBOL_IS_SPECIAL (sym
.minsym
));
442 /* If the user wants to override the fallback mode, let them. */
443 if (strcmp (arm_fallback_mode_string
, "arm") == 0)
445 if (strcmp (arm_fallback_mode_string
, "thumb") == 0)
448 /* If we couldn't find any symbol, but we're talking to a running
449 target, then trust the current value of $cpsr. This lets
450 "display/i $pc" always show the correct mode (though if there is
451 a symbol table we will not reach here, so it still may not be
452 displayed in the mode it will be executed). */
453 if (target_has_registers
)
454 return arm_frame_is_thumb (get_current_frame ());
456 /* Otherwise we're out of luck; we assume ARM. */
460 /* Determine if the address specified equals any of these magic return
461 values, called EXC_RETURN, defined by the ARM v6-M and v7-M
464 From ARMv6-M Reference Manual B1.5.8
465 Table B1-5 Exception return behavior
467 EXC_RETURN Return To Return Stack
468 0xFFFFFFF1 Handler mode Main
469 0xFFFFFFF9 Thread mode Main
470 0xFFFFFFFD Thread mode Process
472 From ARMv7-M Reference Manual B1.5.8
473 Table B1-8 EXC_RETURN definition of exception return behavior, no FP
475 EXC_RETURN Return To Return Stack
476 0xFFFFFFF1 Handler mode Main
477 0xFFFFFFF9 Thread mode Main
478 0xFFFFFFFD Thread mode Process
480 Table B1-9 EXC_RETURN definition of exception return behavior, with
483 EXC_RETURN Return To Return Stack Frame Type
484 0xFFFFFFE1 Handler mode Main Extended
485 0xFFFFFFE9 Thread mode Main Extended
486 0xFFFFFFED Thread mode Process Extended
487 0xFFFFFFF1 Handler mode Main Basic
488 0xFFFFFFF9 Thread mode Main Basic
489 0xFFFFFFFD Thread mode Process Basic
491 For more details see "B1.5.8 Exception return behavior"
492 in both ARMv6-M and ARMv7-M Architecture Reference Manuals. */
495 arm_m_addr_is_magic (CORE_ADDR addr
)
499 /* Values from Tables in B1.5.8 the EXC_RETURN definitions of
500 the exception return behavior. */
507 /* Address is magic. */
511 /* Address is not magic. */
516 /* Remove useless bits from addresses in a running program. */
518 arm_addr_bits_remove (struct gdbarch
*gdbarch
, CORE_ADDR val
)
520 /* On M-profile devices, do not strip the low bit from EXC_RETURN
521 (the magic exception return address). */
522 if (gdbarch_tdep (gdbarch
)->is_m
523 && arm_m_addr_is_magic (val
))
527 return UNMAKE_THUMB_ADDR (val
);
529 return (val
& 0x03fffffc);
532 /* Return 1 if PC is the start of a compiler helper function which
533 can be safely ignored during prologue skipping. IS_THUMB is true
534 if the function is known to be a Thumb function due to the way it
537 skip_prologue_function (struct gdbarch
*gdbarch
, CORE_ADDR pc
, int is_thumb
)
539 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
540 struct bound_minimal_symbol msym
;
542 msym
= lookup_minimal_symbol_by_pc (pc
);
543 if (msym
.minsym
!= NULL
544 && BMSYMBOL_VALUE_ADDRESS (msym
) == pc
545 && MSYMBOL_LINKAGE_NAME (msym
.minsym
) != NULL
)
547 const char *name
= MSYMBOL_LINKAGE_NAME (msym
.minsym
);
549 /* The GNU linker's Thumb call stub to foo is named
551 if (strstr (name
, "_from_thumb") != NULL
)
554 /* On soft-float targets, __truncdfsf2 is called to convert promoted
555 arguments to their argument types in non-prototyped
557 if (startswith (name
, "__truncdfsf2"))
559 if (startswith (name
, "__aeabi_d2f"))
562 /* Internal functions related to thread-local storage. */
563 if (startswith (name
, "__tls_get_addr"))
565 if (startswith (name
, "__aeabi_read_tp"))
570 /* If we run against a stripped glibc, we may be unable to identify
571 special functions by name. Check for one important case,
572 __aeabi_read_tp, by comparing the *code* against the default
573 implementation (this is hand-written ARM assembler in glibc). */
576 && read_code_unsigned_integer (pc
, 4, byte_order_for_code
)
577 == 0xe3e00a0f /* mov r0, #0xffff0fff */
578 && read_code_unsigned_integer (pc
+ 4, 4, byte_order_for_code
)
579 == 0xe240f01f) /* sub pc, r0, #31 */
586 /* Extract the immediate from instruction movw/movt of encoding T. INSN1 is
587 the first 16-bit of instruction, and INSN2 is the second 16-bit of
589 #define EXTRACT_MOVW_MOVT_IMM_T(insn1, insn2) \
590 ((bits ((insn1), 0, 3) << 12) \
591 | (bits ((insn1), 10, 10) << 11) \
592 | (bits ((insn2), 12, 14) << 8) \
593 | bits ((insn2), 0, 7))
595 /* Extract the immediate from instruction movw/movt of encoding A. INSN is
596 the 32-bit instruction. */
597 #define EXTRACT_MOVW_MOVT_IMM_A(insn) \
598 ((bits ((insn), 16, 19) << 12) \
599 | bits ((insn), 0, 11))
601 /* Decode immediate value; implements ThumbExpandImmediate pseudo-op. */
604 thumb_expand_immediate (unsigned int imm
)
606 unsigned int count
= imm
>> 7;
614 return (imm
& 0xff) | ((imm
& 0xff) << 16);
616 return ((imm
& 0xff) << 8) | ((imm
& 0xff) << 24);
618 return (imm
& 0xff) | ((imm
& 0xff) << 8)
619 | ((imm
& 0xff) << 16) | ((imm
& 0xff) << 24);
622 return (0x80 | (imm
& 0x7f)) << (32 - count
);
625 /* Return 1 if the 16-bit Thumb instruction INSN restores SP in
626 epilogue, 0 otherwise. */
629 thumb_instruction_restores_sp (unsigned short insn
)
631 return (insn
== 0x46bd /* mov sp, r7 */
632 || (insn
& 0xff80) == 0xb000 /* add sp, imm */
633 || (insn
& 0xfe00) == 0xbc00); /* pop <registers> */
636 /* Analyze a Thumb prologue, looking for a recognizable stack frame
637 and frame pointer. Scan until we encounter a store that could
638 clobber the stack frame unexpectedly, or an unknown instruction.
639 Return the last address which is definitely safe to skip for an
640 initial breakpoint. */
643 thumb_analyze_prologue (struct gdbarch
*gdbarch
,
644 CORE_ADDR start
, CORE_ADDR limit
,
645 struct arm_prologue_cache
*cache
)
647 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
648 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
652 CORE_ADDR unrecognized_pc
= 0;
654 for (i
= 0; i
< 16; i
++)
655 regs
[i
] = pv_register (i
, 0);
656 pv_area
stack (ARM_SP_REGNUM
, gdbarch_addr_bit (gdbarch
));
658 while (start
< limit
)
662 insn
= read_code_unsigned_integer (start
, 2, byte_order_for_code
);
664 if ((insn
& 0xfe00) == 0xb400) /* push { rlist } */
669 if (stack
.store_would_trash (regs
[ARM_SP_REGNUM
]))
672 /* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says
673 whether to save LR (R14). */
674 mask
= (insn
& 0xff) | ((insn
& 0x100) << 6);
676 /* Calculate offsets of saved R0-R7 and LR. */
677 for (regno
= ARM_LR_REGNUM
; regno
>= 0; regno
--)
678 if (mask
& (1 << regno
))
680 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
],
682 stack
.store (regs
[ARM_SP_REGNUM
], 4, regs
[regno
]);
685 else if ((insn
& 0xff80) == 0xb080) /* sub sp, #imm */
687 offset
= (insn
& 0x7f) << 2; /* get scaled offset */
688 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
],
691 else if (thumb_instruction_restores_sp (insn
))
693 /* Don't scan past the epilogue. */
696 else if ((insn
& 0xf800) == 0xa800) /* add Rd, sp, #imm */
697 regs
[bits (insn
, 8, 10)] = pv_add_constant (regs
[ARM_SP_REGNUM
],
699 else if ((insn
& 0xfe00) == 0x1c00 /* add Rd, Rn, #imm */
700 && pv_is_register (regs
[bits (insn
, 3, 5)], ARM_SP_REGNUM
))
701 regs
[bits (insn
, 0, 2)] = pv_add_constant (regs
[bits (insn
, 3, 5)],
703 else if ((insn
& 0xf800) == 0x3000 /* add Rd, #imm */
704 && pv_is_register (regs
[bits (insn
, 8, 10)], ARM_SP_REGNUM
))
705 regs
[bits (insn
, 8, 10)] = pv_add_constant (regs
[bits (insn
, 8, 10)],
707 else if ((insn
& 0xfe00) == 0x1800 /* add Rd, Rn, Rm */
708 && pv_is_register (regs
[bits (insn
, 6, 8)], ARM_SP_REGNUM
)
709 && pv_is_constant (regs
[bits (insn
, 3, 5)]))
710 regs
[bits (insn
, 0, 2)] = pv_add (regs
[bits (insn
, 3, 5)],
711 regs
[bits (insn
, 6, 8)]);
712 else if ((insn
& 0xff00) == 0x4400 /* add Rd, Rm */
713 && pv_is_constant (regs
[bits (insn
, 3, 6)]))
715 int rd
= (bit (insn
, 7) << 3) + bits (insn
, 0, 2);
716 int rm
= bits (insn
, 3, 6);
717 regs
[rd
] = pv_add (regs
[rd
], regs
[rm
]);
719 else if ((insn
& 0xff00) == 0x4600) /* mov hi, lo or mov lo, hi */
721 int dst_reg
= (insn
& 0x7) + ((insn
& 0x80) >> 4);
722 int src_reg
= (insn
& 0x78) >> 3;
723 regs
[dst_reg
] = regs
[src_reg
];
725 else if ((insn
& 0xf800) == 0x9000) /* str rd, [sp, #off] */
727 /* Handle stores to the stack. Normally pushes are used,
728 but with GCC -mtpcs-frame, there may be other stores
729 in the prologue to create the frame. */
730 int regno
= (insn
>> 8) & 0x7;
733 offset
= (insn
& 0xff) << 2;
734 addr
= pv_add_constant (regs
[ARM_SP_REGNUM
], offset
);
736 if (stack
.store_would_trash (addr
))
739 stack
.store (addr
, 4, regs
[regno
]);
741 else if ((insn
& 0xf800) == 0x6000) /* str rd, [rn, #off] */
743 int rd
= bits (insn
, 0, 2);
744 int rn
= bits (insn
, 3, 5);
747 offset
= bits (insn
, 6, 10) << 2;
748 addr
= pv_add_constant (regs
[rn
], offset
);
750 if (stack
.store_would_trash (addr
))
753 stack
.store (addr
, 4, regs
[rd
]);
755 else if (((insn
& 0xf800) == 0x7000 /* strb Rd, [Rn, #off] */
756 || (insn
& 0xf800) == 0x8000) /* strh Rd, [Rn, #off] */
757 && pv_is_register (regs
[bits (insn
, 3, 5)], ARM_SP_REGNUM
))
758 /* Ignore stores of argument registers to the stack. */
760 else if ((insn
& 0xf800) == 0xc800 /* ldmia Rn!, { registers } */
761 && pv_is_register (regs
[bits (insn
, 8, 10)], ARM_SP_REGNUM
))
762 /* Ignore block loads from the stack, potentially copying
763 parameters from memory. */
765 else if ((insn
& 0xf800) == 0x9800 /* ldr Rd, [Rn, #immed] */
766 || ((insn
& 0xf800) == 0x6800 /* ldr Rd, [sp, #immed] */
767 && pv_is_register (regs
[bits (insn
, 3, 5)], ARM_SP_REGNUM
)))
768 /* Similarly ignore single loads from the stack. */
770 else if ((insn
& 0xffc0) == 0x0000 /* lsls Rd, Rm, #0 */
771 || (insn
& 0xffc0) == 0x1c00) /* add Rd, Rn, #0 */
772 /* Skip register copies, i.e. saves to another register
773 instead of the stack. */
775 else if ((insn
& 0xf800) == 0x2000) /* movs Rd, #imm */
776 /* Recognize constant loads; even with small stacks these are necessary
778 regs
[bits (insn
, 8, 10)] = pv_constant (bits (insn
, 0, 7));
779 else if ((insn
& 0xf800) == 0x4800) /* ldr Rd, [pc, #imm] */
781 /* Constant pool loads, for the same reason. */
782 unsigned int constant
;
785 loc
= start
+ 4 + bits (insn
, 0, 7) * 4;
786 constant
= read_memory_unsigned_integer (loc
, 4, byte_order
);
787 regs
[bits (insn
, 8, 10)] = pv_constant (constant
);
789 else if (thumb_insn_size (insn
) == 4) /* 32-bit Thumb-2 instructions. */
791 unsigned short inst2
;
793 inst2
= read_code_unsigned_integer (start
+ 2, 2,
794 byte_order_for_code
);
796 if ((insn
& 0xf800) == 0xf000 && (inst2
& 0xe800) == 0xe800)
798 /* BL, BLX. Allow some special function calls when
799 skipping the prologue; GCC generates these before
800 storing arguments to the stack. */
802 int j1
, j2
, imm1
, imm2
;
804 imm1
= sbits (insn
, 0, 10);
805 imm2
= bits (inst2
, 0, 10);
806 j1
= bit (inst2
, 13);
807 j2
= bit (inst2
, 11);
809 offset
= ((imm1
<< 12) + (imm2
<< 1));
810 offset
^= ((!j2
) << 22) | ((!j1
) << 23);
812 nextpc
= start
+ 4 + offset
;
813 /* For BLX make sure to clear the low bits. */
814 if (bit (inst2
, 12) == 0)
815 nextpc
= nextpc
& 0xfffffffc;
817 if (!skip_prologue_function (gdbarch
, nextpc
,
818 bit (inst2
, 12) != 0))
822 else if ((insn
& 0xffd0) == 0xe900 /* stmdb Rn{!},
824 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
826 pv_t addr
= regs
[bits (insn
, 0, 3)];
829 if (stack
.store_would_trash (addr
))
832 /* Calculate offsets of saved registers. */
833 for (regno
= ARM_LR_REGNUM
; regno
>= 0; regno
--)
834 if (inst2
& (1 << regno
))
836 addr
= pv_add_constant (addr
, -4);
837 stack
.store (addr
, 4, regs
[regno
]);
841 regs
[bits (insn
, 0, 3)] = addr
;
844 else if ((insn
& 0xff50) == 0xe940 /* strd Rt, Rt2,
846 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
848 int regno1
= bits (inst2
, 12, 15);
849 int regno2
= bits (inst2
, 8, 11);
850 pv_t addr
= regs
[bits (insn
, 0, 3)];
852 offset
= inst2
& 0xff;
854 addr
= pv_add_constant (addr
, offset
);
856 addr
= pv_add_constant (addr
, -offset
);
858 if (stack
.store_would_trash (addr
))
861 stack
.store (addr
, 4, regs
[regno1
]);
862 stack
.store (pv_add_constant (addr
, 4),
866 regs
[bits (insn
, 0, 3)] = addr
;
869 else if ((insn
& 0xfff0) == 0xf8c0 /* str Rt,[Rn,+/-#imm]{!} */
870 && (inst2
& 0x0c00) == 0x0c00
871 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
873 int regno
= bits (inst2
, 12, 15);
874 pv_t addr
= regs
[bits (insn
, 0, 3)];
876 offset
= inst2
& 0xff;
878 addr
= pv_add_constant (addr
, offset
);
880 addr
= pv_add_constant (addr
, -offset
);
882 if (stack
.store_would_trash (addr
))
885 stack
.store (addr
, 4, regs
[regno
]);
888 regs
[bits (insn
, 0, 3)] = addr
;
891 else if ((insn
& 0xfff0) == 0xf8c0 /* str.w Rt,[Rn,#imm] */
892 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
894 int regno
= bits (inst2
, 12, 15);
897 offset
= inst2
& 0xfff;
898 addr
= pv_add_constant (regs
[bits (insn
, 0, 3)], offset
);
900 if (stack
.store_would_trash (addr
))
903 stack
.store (addr
, 4, regs
[regno
]);
906 else if ((insn
& 0xffd0) == 0xf880 /* str{bh}.w Rt,[Rn,#imm] */
907 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
908 /* Ignore stores of argument registers to the stack. */
911 else if ((insn
& 0xffd0) == 0xf800 /* str{bh} Rt,[Rn,#+/-imm] */
912 && (inst2
& 0x0d00) == 0x0c00
913 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
914 /* Ignore stores of argument registers to the stack. */
917 else if ((insn
& 0xffd0) == 0xe890 /* ldmia Rn[!],
919 && (inst2
& 0x8000) == 0x0000
920 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
921 /* Ignore block loads from the stack, potentially copying
922 parameters from memory. */
925 else if ((insn
& 0xffb0) == 0xe950 /* ldrd Rt, Rt2,
927 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
928 /* Similarly ignore dual loads from the stack. */
931 else if ((insn
& 0xfff0) == 0xf850 /* ldr Rt,[Rn,#+/-imm] */
932 && (inst2
& 0x0d00) == 0x0c00
933 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
934 /* Similarly ignore single loads from the stack. */
937 else if ((insn
& 0xfff0) == 0xf8d0 /* ldr.w Rt,[Rn,#imm] */
938 && pv_is_register (regs
[bits (insn
, 0, 3)], ARM_SP_REGNUM
))
939 /* Similarly ignore single loads from the stack. */
942 else if ((insn
& 0xfbf0) == 0xf100 /* add.w Rd, Rn, #imm */
943 && (inst2
& 0x8000) == 0x0000)
945 unsigned int imm
= ((bits (insn
, 10, 10) << 11)
946 | (bits (inst2
, 12, 14) << 8)
947 | bits (inst2
, 0, 7));
949 regs
[bits (inst2
, 8, 11)]
950 = pv_add_constant (regs
[bits (insn
, 0, 3)],
951 thumb_expand_immediate (imm
));
954 else if ((insn
& 0xfbf0) == 0xf200 /* addw Rd, Rn, #imm */
955 && (inst2
& 0x8000) == 0x0000)
957 unsigned int imm
= ((bits (insn
, 10, 10) << 11)
958 | (bits (inst2
, 12, 14) << 8)
959 | bits (inst2
, 0, 7));
961 regs
[bits (inst2
, 8, 11)]
962 = pv_add_constant (regs
[bits (insn
, 0, 3)], imm
);
965 else if ((insn
& 0xfbf0) == 0xf1a0 /* sub.w Rd, Rn, #imm */
966 && (inst2
& 0x8000) == 0x0000)
968 unsigned int imm
= ((bits (insn
, 10, 10) << 11)
969 | (bits (inst2
, 12, 14) << 8)
970 | bits (inst2
, 0, 7));
972 regs
[bits (inst2
, 8, 11)]
973 = pv_add_constant (regs
[bits (insn
, 0, 3)],
974 - (CORE_ADDR
) thumb_expand_immediate (imm
));
977 else if ((insn
& 0xfbf0) == 0xf2a0 /* subw Rd, Rn, #imm */
978 && (inst2
& 0x8000) == 0x0000)
980 unsigned int imm
= ((bits (insn
, 10, 10) << 11)
981 | (bits (inst2
, 12, 14) << 8)
982 | bits (inst2
, 0, 7));
984 regs
[bits (inst2
, 8, 11)]
985 = pv_add_constant (regs
[bits (insn
, 0, 3)], - (CORE_ADDR
) imm
);
988 else if ((insn
& 0xfbff) == 0xf04f) /* mov.w Rd, #const */
990 unsigned int imm
= ((bits (insn
, 10, 10) << 11)
991 | (bits (inst2
, 12, 14) << 8)
992 | bits (inst2
, 0, 7));
994 regs
[bits (inst2
, 8, 11)]
995 = pv_constant (thumb_expand_immediate (imm
));
998 else if ((insn
& 0xfbf0) == 0xf240) /* movw Rd, #const */
1001 = EXTRACT_MOVW_MOVT_IMM_T (insn
, inst2
);
1003 regs
[bits (inst2
, 8, 11)] = pv_constant (imm
);
1006 else if (insn
== 0xea5f /* mov.w Rd,Rm */
1007 && (inst2
& 0xf0f0) == 0)
1009 int dst_reg
= (inst2
& 0x0f00) >> 8;
1010 int src_reg
= inst2
& 0xf;
1011 regs
[dst_reg
] = regs
[src_reg
];
1014 else if ((insn
& 0xff7f) == 0xf85f) /* ldr.w Rt,<label> */
1016 /* Constant pool loads. */
1017 unsigned int constant
;
1020 offset
= bits (inst2
, 0, 11);
1022 loc
= start
+ 4 + offset
;
1024 loc
= start
+ 4 - offset
;
1026 constant
= read_memory_unsigned_integer (loc
, 4, byte_order
);
1027 regs
[bits (inst2
, 12, 15)] = pv_constant (constant
);
1030 else if ((insn
& 0xff7f) == 0xe95f) /* ldrd Rt,Rt2,<label> */
1032 /* Constant pool loads. */
1033 unsigned int constant
;
1036 offset
= bits (inst2
, 0, 7) << 2;
1038 loc
= start
+ 4 + offset
;
1040 loc
= start
+ 4 - offset
;
1042 constant
= read_memory_unsigned_integer (loc
, 4, byte_order
);
1043 regs
[bits (inst2
, 12, 15)] = pv_constant (constant
);
1045 constant
= read_memory_unsigned_integer (loc
+ 4, 4, byte_order
);
1046 regs
[bits (inst2
, 8, 11)] = pv_constant (constant
);
1049 else if (thumb2_instruction_changes_pc (insn
, inst2
))
1051 /* Don't scan past anything that might change control flow. */
1056 /* The optimizer might shove anything into the prologue,
1057 so we just skip what we don't recognize. */
1058 unrecognized_pc
= start
;
1063 else if (thumb_instruction_changes_pc (insn
))
1065 /* Don't scan past anything that might change control flow. */
1070 /* The optimizer might shove anything into the prologue,
1071 so we just skip what we don't recognize. */
1072 unrecognized_pc
= start
;
1079 fprintf_unfiltered (gdb_stdlog
, "Prologue scan stopped at %s\n",
1080 paddress (gdbarch
, start
));
1082 if (unrecognized_pc
== 0)
1083 unrecognized_pc
= start
;
1086 return unrecognized_pc
;
1088 if (pv_is_register (regs
[ARM_FP_REGNUM
], ARM_SP_REGNUM
))
1090 /* Frame pointer is fp. Frame size is constant. */
1091 cache
->framereg
= ARM_FP_REGNUM
;
1092 cache
->framesize
= -regs
[ARM_FP_REGNUM
].k
;
1094 else if (pv_is_register (regs
[THUMB_FP_REGNUM
], ARM_SP_REGNUM
))
1096 /* Frame pointer is r7. Frame size is constant. */
1097 cache
->framereg
= THUMB_FP_REGNUM
;
1098 cache
->framesize
= -regs
[THUMB_FP_REGNUM
].k
;
1102 /* Try the stack pointer... this is a bit desperate. */
1103 cache
->framereg
= ARM_SP_REGNUM
;
1104 cache
->framesize
= -regs
[ARM_SP_REGNUM
].k
;
1107 for (i
= 0; i
< 16; i
++)
1108 if (stack
.find_reg (gdbarch
, i
, &offset
))
1109 cache
->saved_regs
[i
].addr
= offset
;
1111 return unrecognized_pc
;
1115 /* Try to analyze the instructions starting from PC, which load symbol
1116 __stack_chk_guard. Return the address of instruction after loading this
1117 symbol, set the dest register number to *BASEREG, and set the size of
1118 instructions for loading symbol in OFFSET. Return 0 if instructions are
1122 arm_analyze_load_stack_chk_guard(CORE_ADDR pc
, struct gdbarch
*gdbarch
,
1123 unsigned int *destreg
, int *offset
)
1125 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
1126 int is_thumb
= arm_pc_is_thumb (gdbarch
, pc
);
1127 unsigned int low
, high
, address
;
1132 unsigned short insn1
1133 = read_code_unsigned_integer (pc
, 2, byte_order_for_code
);
1135 if ((insn1
& 0xf800) == 0x4800) /* ldr Rd, #immed */
1137 *destreg
= bits (insn1
, 8, 10);
1139 address
= (pc
& 0xfffffffc) + 4 + (bits (insn1
, 0, 7) << 2);
1140 address
= read_memory_unsigned_integer (address
, 4,
1141 byte_order_for_code
);
1143 else if ((insn1
& 0xfbf0) == 0xf240) /* movw Rd, #const */
1145 unsigned short insn2
1146 = read_code_unsigned_integer (pc
+ 2, 2, byte_order_for_code
);
1148 low
= EXTRACT_MOVW_MOVT_IMM_T (insn1
, insn2
);
1151 = read_code_unsigned_integer (pc
+ 4, 2, byte_order_for_code
);
1153 = read_code_unsigned_integer (pc
+ 6, 2, byte_order_for_code
);
1155 /* movt Rd, #const */
1156 if ((insn1
& 0xfbc0) == 0xf2c0)
1158 high
= EXTRACT_MOVW_MOVT_IMM_T (insn1
, insn2
);
1159 *destreg
= bits (insn2
, 8, 11);
1161 address
= (high
<< 16 | low
);
1168 = read_code_unsigned_integer (pc
, 4, byte_order_for_code
);
1170 if ((insn
& 0x0e5f0000) == 0x041f0000) /* ldr Rd, [PC, #immed] */
1172 address
= bits (insn
, 0, 11) + pc
+ 8;
1173 address
= read_memory_unsigned_integer (address
, 4,
1174 byte_order_for_code
);
1176 *destreg
= bits (insn
, 12, 15);
1179 else if ((insn
& 0x0ff00000) == 0x03000000) /* movw Rd, #const */
1181 low
= EXTRACT_MOVW_MOVT_IMM_A (insn
);
1184 = read_code_unsigned_integer (pc
+ 4, 4, byte_order_for_code
);
1186 if ((insn
& 0x0ff00000) == 0x03400000) /* movt Rd, #const */
1188 high
= EXTRACT_MOVW_MOVT_IMM_A (insn
);
1189 *destreg
= bits (insn
, 12, 15);
1191 address
= (high
<< 16 | low
);
1199 /* Try to skip a sequence of instructions used for stack protector. If PC
1200 points to the first instruction of this sequence, return the address of
1201 first instruction after this sequence, otherwise, return original PC.
1203 On arm, this sequence of instructions is composed of mainly three steps,
1204 Step 1: load symbol __stack_chk_guard,
1205 Step 2: load from address of __stack_chk_guard,
1206 Step 3: store it to somewhere else.
1208 Usually, instructions on step 2 and step 3 are the same on various ARM
1209 architectures. On step 2, it is one instruction 'ldr Rx, [Rn, #0]', and
1210 on step 3, it is also one instruction 'str Rx, [r7, #immd]'. However,
1211 instructions in step 1 vary from different ARM architectures. On ARMv7,
1214 movw Rn, #:lower16:__stack_chk_guard
1215 movt Rn, #:upper16:__stack_chk_guard
1222 .word __stack_chk_guard
1224 Since ldr/str is a very popular instruction, we can't use them as
1225 'fingerprint' or 'signature' of stack protector sequence. Here we choose
1226 sequence {movw/movt, ldr}/ldr/str plus symbol __stack_chk_guard, if not
1227 stripped, as the 'fingerprint' of a stack protector cdoe sequence. */
1230 arm_skip_stack_protector(CORE_ADDR pc
, struct gdbarch
*gdbarch
)
1232 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
1233 unsigned int basereg
;
1234 struct bound_minimal_symbol stack_chk_guard
;
1236 int is_thumb
= arm_pc_is_thumb (gdbarch
, pc
);
1239 /* Try to parse the instructions in Step 1. */
1240 addr
= arm_analyze_load_stack_chk_guard (pc
, gdbarch
,
1245 stack_chk_guard
= lookup_minimal_symbol_by_pc (addr
);
1246 /* ADDR must correspond to a symbol whose name is __stack_chk_guard.
1247 Otherwise, this sequence cannot be for stack protector. */
1248 if (stack_chk_guard
.minsym
== NULL
1249 || !startswith (MSYMBOL_LINKAGE_NAME (stack_chk_guard
.minsym
), "__stack_chk_guard"))
1254 unsigned int destreg
;
1256 = read_code_unsigned_integer (pc
+ offset
, 2, byte_order_for_code
);
1258 /* Step 2: ldr Rd, [Rn, #immed], encoding T1. */
1259 if ((insn
& 0xf800) != 0x6800)
1261 if (bits (insn
, 3, 5) != basereg
)
1263 destreg
= bits (insn
, 0, 2);
1265 insn
= read_code_unsigned_integer (pc
+ offset
+ 2, 2,
1266 byte_order_for_code
);
1267 /* Step 3: str Rd, [Rn, #immed], encoding T1. */
1268 if ((insn
& 0xf800) != 0x6000)
1270 if (destreg
!= bits (insn
, 0, 2))
1275 unsigned int destreg
;
1277 = read_code_unsigned_integer (pc
+ offset
, 4, byte_order_for_code
);
1279 /* Step 2: ldr Rd, [Rn, #immed], encoding A1. */
1280 if ((insn
& 0x0e500000) != 0x04100000)
1282 if (bits (insn
, 16, 19) != basereg
)
1284 destreg
= bits (insn
, 12, 15);
1285 /* Step 3: str Rd, [Rn, #immed], encoding A1. */
1286 insn
= read_code_unsigned_integer (pc
+ offset
+ 4,
1287 4, byte_order_for_code
);
1288 if ((insn
& 0x0e500000) != 0x04000000)
1290 if (bits (insn
, 12, 15) != destreg
)
1293 /* The size of total two instructions ldr/str is 4 on Thumb-2, while 8
1296 return pc
+ offset
+ 4;
1298 return pc
+ offset
+ 8;
1301 /* Advance the PC across any function entry prologue instructions to
1302 reach some "real" code.
1304 The APCS (ARM Procedure Call Standard) defines the following
1308 [stmfd sp!, {a1,a2,a3,a4}]
1309 stmfd sp!, {...,fp,ip,lr,pc}
1310 [stfe f7, [sp, #-12]!]
1311 [stfe f6, [sp, #-12]!]
1312 [stfe f5, [sp, #-12]!]
1313 [stfe f4, [sp, #-12]!]
1314 sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn. */
1317 arm_skip_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
1319 CORE_ADDR func_addr
, limit_pc
;
1321 /* See if we can determine the end of the prologue via the symbol table.
1322 If so, then return either PC, or the PC after the prologue, whichever
1324 if (find_pc_partial_function (pc
, NULL
, &func_addr
, NULL
))
1326 CORE_ADDR post_prologue_pc
1327 = skip_prologue_using_sal (gdbarch
, func_addr
);
1328 struct compunit_symtab
*cust
= find_pc_compunit_symtab (func_addr
);
1330 if (post_prologue_pc
)
1332 = arm_skip_stack_protector (post_prologue_pc
, gdbarch
);
1335 /* GCC always emits a line note before the prologue and another
1336 one after, even if the two are at the same address or on the
1337 same line. Take advantage of this so that we do not need to
1338 know every instruction that might appear in the prologue. We
1339 will have producer information for most binaries; if it is
1340 missing (e.g. for -gstabs), assuming the GNU tools. */
1341 if (post_prologue_pc
1343 || COMPUNIT_PRODUCER (cust
) == NULL
1344 || startswith (COMPUNIT_PRODUCER (cust
), "GNU ")
1345 || startswith (COMPUNIT_PRODUCER (cust
), "clang ")))
1346 return post_prologue_pc
;
1348 if (post_prologue_pc
!= 0)
1350 CORE_ADDR analyzed_limit
;
1352 /* For non-GCC compilers, make sure the entire line is an
1353 acceptable prologue; GDB will round this function's
1354 return value up to the end of the following line so we
1355 can not skip just part of a line (and we do not want to).
1357 RealView does not treat the prologue specially, but does
1358 associate prologue code with the opening brace; so this
1359 lets us skip the first line if we think it is the opening
1361 if (arm_pc_is_thumb (gdbarch
, func_addr
))
1362 analyzed_limit
= thumb_analyze_prologue (gdbarch
, func_addr
,
1363 post_prologue_pc
, NULL
);
1365 analyzed_limit
= arm_analyze_prologue (gdbarch
, func_addr
,
1366 post_prologue_pc
, NULL
);
1368 if (analyzed_limit
!= post_prologue_pc
)
1371 return post_prologue_pc
;
1375 /* Can't determine prologue from the symbol table, need to examine
1378 /* Find an upper limit on the function prologue using the debug
1379 information. If the debug information could not be used to provide
1380 that bound, then use an arbitrary large number as the upper bound. */
1381 /* Like arm_scan_prologue, stop no later than pc + 64. */
1382 limit_pc
= skip_prologue_using_sal (gdbarch
, pc
);
1384 limit_pc
= pc
+ 64; /* Magic. */
1387 /* Check if this is Thumb code. */
1388 if (arm_pc_is_thumb (gdbarch
, pc
))
1389 return thumb_analyze_prologue (gdbarch
, pc
, limit_pc
, NULL
);
1391 return arm_analyze_prologue (gdbarch
, pc
, limit_pc
, NULL
);
1395 /* Function: thumb_scan_prologue (helper function for arm_scan_prologue)
1396 This function decodes a Thumb function prologue to determine:
1397 1) the size of the stack frame
1398 2) which registers are saved on it
1399 3) the offsets of saved regs
1400 4) the offset from the stack pointer to the frame pointer
1402 A typical Thumb function prologue would create this stack frame
1403 (offsets relative to FP)
1404 old SP -> 24 stack parameters
1407 R7 -> 0 local variables (16 bytes)
1408 SP -> -12 additional stack space (12 bytes)
1409 The frame size would thus be 36 bytes, and the frame offset would be
1410 12 bytes. The frame register is R7.
1412 The comments for thumb_skip_prolog() describe the algorithm we use
1413 to detect the end of the prolog. */
1417 thumb_scan_prologue (struct gdbarch
*gdbarch
, CORE_ADDR prev_pc
,
1418 CORE_ADDR block_addr
, struct arm_prologue_cache
*cache
)
1420 CORE_ADDR prologue_start
;
1421 CORE_ADDR prologue_end
;
1423 if (find_pc_partial_function (block_addr
, NULL
, &prologue_start
,
1426 /* See comment in arm_scan_prologue for an explanation of
1428 if (prologue_end
> prologue_start
+ 64)
1430 prologue_end
= prologue_start
+ 64;
1434 /* We're in the boondocks: we have no idea where the start of the
1438 prologue_end
= std::min (prologue_end
, prev_pc
);
1440 thumb_analyze_prologue (gdbarch
, prologue_start
, prologue_end
, cache
);
1443 /* Return 1 if the ARM instruction INSN restores SP in epilogue, 0
1447 arm_instruction_restores_sp (unsigned int insn
)
1449 if (bits (insn
, 28, 31) != INST_NV
)
1451 if ((insn
& 0x0df0f000) == 0x0080d000
1452 /* ADD SP (register or immediate). */
1453 || (insn
& 0x0df0f000) == 0x0040d000
1454 /* SUB SP (register or immediate). */
1455 || (insn
& 0x0ffffff0) == 0x01a0d000
1457 || (insn
& 0x0fff0000) == 0x08bd0000
1459 || (insn
& 0x0fff0000) == 0x049d0000)
1460 /* POP of a single register. */
1467 /* Analyze an ARM mode prologue starting at PROLOGUE_START and
1468 continuing no further than PROLOGUE_END. If CACHE is non-NULL,
1469 fill it in. Return the first address not recognized as a prologue
1472 We recognize all the instructions typically found in ARM prologues,
1473 plus harmless instructions which can be skipped (either for analysis
1474 purposes, or a more restrictive set that can be skipped when finding
1475 the end of the prologue). */
1478 arm_analyze_prologue (struct gdbarch
*gdbarch
,
1479 CORE_ADDR prologue_start
, CORE_ADDR prologue_end
,
1480 struct arm_prologue_cache
*cache
)
1482 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
1484 CORE_ADDR offset
, current_pc
;
1485 pv_t regs
[ARM_FPS_REGNUM
];
1486 CORE_ADDR unrecognized_pc
= 0;
1488 /* Search the prologue looking for instructions that set up the
1489 frame pointer, adjust the stack pointer, and save registers.
1491 Be careful, however, and if it doesn't look like a prologue,
1492 don't try to scan it. If, for instance, a frameless function
1493 begins with stmfd sp!, then we will tell ourselves there is
1494 a frame, which will confuse stack traceback, as well as "finish"
1495 and other operations that rely on a knowledge of the stack
1498 for (regno
= 0; regno
< ARM_FPS_REGNUM
; regno
++)
1499 regs
[regno
] = pv_register (regno
, 0);
1500 pv_area
stack (ARM_SP_REGNUM
, gdbarch_addr_bit (gdbarch
));
1502 for (current_pc
= prologue_start
;
1503 current_pc
< prologue_end
;
1507 = read_code_unsigned_integer (current_pc
, 4, byte_order_for_code
);
1509 if (insn
== 0xe1a0c00d) /* mov ip, sp */
1511 regs
[ARM_IP_REGNUM
] = regs
[ARM_SP_REGNUM
];
1514 else if ((insn
& 0xfff00000) == 0xe2800000 /* add Rd, Rn, #n */
1515 && pv_is_register (regs
[bits (insn
, 16, 19)], ARM_SP_REGNUM
))
1517 unsigned imm
= insn
& 0xff; /* immediate value */
1518 unsigned rot
= (insn
& 0xf00) >> 7; /* rotate amount */
1519 int rd
= bits (insn
, 12, 15);
1520 imm
= (imm
>> rot
) | (imm
<< (32 - rot
));
1521 regs
[rd
] = pv_add_constant (regs
[bits (insn
, 16, 19)], imm
);
1524 else if ((insn
& 0xfff00000) == 0xe2400000 /* sub Rd, Rn, #n */
1525 && pv_is_register (regs
[bits (insn
, 16, 19)], ARM_SP_REGNUM
))
1527 unsigned imm
= insn
& 0xff; /* immediate value */
1528 unsigned rot
= (insn
& 0xf00) >> 7; /* rotate amount */
1529 int rd
= bits (insn
, 12, 15);
1530 imm
= (imm
>> rot
) | (imm
<< (32 - rot
));
1531 regs
[rd
] = pv_add_constant (regs
[bits (insn
, 16, 19)], -imm
);
1534 else if ((insn
& 0xffff0fff) == 0xe52d0004) /* str Rd,
1537 if (stack
.store_would_trash (regs
[ARM_SP_REGNUM
]))
1539 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
], -4);
1540 stack
.store (regs
[ARM_SP_REGNUM
], 4,
1541 regs
[bits (insn
, 12, 15)]);
1544 else if ((insn
& 0xffff0000) == 0xe92d0000)
1545 /* stmfd sp!, {..., fp, ip, lr, pc}
1547 stmfd sp!, {a1, a2, a3, a4} */
1549 int mask
= insn
& 0xffff;
1551 if (stack
.store_would_trash (regs
[ARM_SP_REGNUM
]))
1554 /* Calculate offsets of saved registers. */
1555 for (regno
= ARM_PC_REGNUM
; regno
>= 0; regno
--)
1556 if (mask
& (1 << regno
))
1559 = pv_add_constant (regs
[ARM_SP_REGNUM
], -4);
1560 stack
.store (regs
[ARM_SP_REGNUM
], 4, regs
[regno
]);
1563 else if ((insn
& 0xffff0000) == 0xe54b0000 /* strb rx,[r11,#-n] */
1564 || (insn
& 0xffff00f0) == 0xe14b00b0 /* strh rx,[r11,#-n] */
1565 || (insn
& 0xffffc000) == 0xe50b0000) /* str rx,[r11,#-n] */
1567 /* No need to add this to saved_regs -- it's just an arg reg. */
1570 else if ((insn
& 0xffff0000) == 0xe5cd0000 /* strb rx,[sp,#n] */
1571 || (insn
& 0xffff00f0) == 0xe1cd00b0 /* strh rx,[sp,#n] */
1572 || (insn
& 0xffffc000) == 0xe58d0000) /* str rx,[sp,#n] */
1574 /* No need to add this to saved_regs -- it's just an arg reg. */
1577 else if ((insn
& 0xfff00000) == 0xe8800000 /* stm Rn,
1579 && pv_is_register (regs
[bits (insn
, 16, 19)], ARM_SP_REGNUM
))
1581 /* No need to add this to saved_regs -- it's just arg regs. */
1584 else if ((insn
& 0xfffff000) == 0xe24cb000) /* sub fp, ip #n */
1586 unsigned imm
= insn
& 0xff; /* immediate value */
1587 unsigned rot
= (insn
& 0xf00) >> 7; /* rotate amount */
1588 imm
= (imm
>> rot
) | (imm
<< (32 - rot
));
1589 regs
[ARM_FP_REGNUM
] = pv_add_constant (regs
[ARM_IP_REGNUM
], -imm
);
1591 else if ((insn
& 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */
1593 unsigned imm
= insn
& 0xff; /* immediate value */
1594 unsigned rot
= (insn
& 0xf00) >> 7; /* rotate amount */
1595 imm
= (imm
>> rot
) | (imm
<< (32 - rot
));
1596 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
], -imm
);
1598 else if ((insn
& 0xffff7fff) == 0xed6d0103 /* stfe f?,
1600 && gdbarch_tdep (gdbarch
)->have_fpa_registers
)
1602 if (stack
.store_would_trash (regs
[ARM_SP_REGNUM
]))
1605 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
], -12);
1606 regno
= ARM_F0_REGNUM
+ ((insn
>> 12) & 0x07);
1607 stack
.store (regs
[ARM_SP_REGNUM
], 12, regs
[regno
]);
1609 else if ((insn
& 0xffbf0fff) == 0xec2d0200 /* sfmfd f0, 4,
1611 && gdbarch_tdep (gdbarch
)->have_fpa_registers
)
1613 int n_saved_fp_regs
;
1614 unsigned int fp_start_reg
, fp_bound_reg
;
1616 if (stack
.store_would_trash (regs
[ARM_SP_REGNUM
]))
1619 if ((insn
& 0x800) == 0x800) /* N0 is set */
1621 if ((insn
& 0x40000) == 0x40000) /* N1 is set */
1622 n_saved_fp_regs
= 3;
1624 n_saved_fp_regs
= 1;
1628 if ((insn
& 0x40000) == 0x40000) /* N1 is set */
1629 n_saved_fp_regs
= 2;
1631 n_saved_fp_regs
= 4;
1634 fp_start_reg
= ARM_F0_REGNUM
+ ((insn
>> 12) & 0x7);
1635 fp_bound_reg
= fp_start_reg
+ n_saved_fp_regs
;
1636 for (; fp_start_reg
< fp_bound_reg
; fp_start_reg
++)
1638 regs
[ARM_SP_REGNUM
] = pv_add_constant (regs
[ARM_SP_REGNUM
], -12);
1639 stack
.store (regs
[ARM_SP_REGNUM
], 12,
1640 regs
[fp_start_reg
++]);
1643 else if ((insn
& 0xff000000) == 0xeb000000 && cache
== NULL
) /* bl */
1645 /* Allow some special function calls when skipping the
1646 prologue; GCC generates these before storing arguments to
1648 CORE_ADDR dest
= BranchDest (current_pc
, insn
);
1650 if (skip_prologue_function (gdbarch
, dest
, 0))
1655 else if ((insn
& 0xf0000000) != 0xe0000000)
1656 break; /* Condition not true, exit early. */
1657 else if (arm_instruction_changes_pc (insn
))
1658 /* Don't scan past anything that might change control flow. */
1660 else if (arm_instruction_restores_sp (insn
))
1662 /* Don't scan past the epilogue. */
1665 else if ((insn
& 0xfe500000) == 0xe8100000 /* ldm */
1666 && pv_is_register (regs
[bits (insn
, 16, 19)], ARM_SP_REGNUM
))
1667 /* Ignore block loads from the stack, potentially copying
1668 parameters from memory. */
1670 else if ((insn
& 0xfc500000) == 0xe4100000
1671 && pv_is_register (regs
[bits (insn
, 16, 19)], ARM_SP_REGNUM
))
1672 /* Similarly ignore single loads from the stack. */
1674 else if ((insn
& 0xffff0ff0) == 0xe1a00000)
1675 /* MOV Rd, Rm. Skip register copies, i.e. saves to another
1676 register instead of the stack. */
1680 /* The optimizer might shove anything into the prologue, if
1681 we build up cache (cache != NULL) from scanning prologue,
1682 we just skip what we don't recognize and scan further to
1683 make cache as complete as possible. However, if we skip
1684 prologue, we'll stop immediately on unrecognized
1686 unrecognized_pc
= current_pc
;
1694 if (unrecognized_pc
== 0)
1695 unrecognized_pc
= current_pc
;
1699 int framereg
, framesize
;
1701 /* The frame size is just the distance from the frame register
1702 to the original stack pointer. */
1703 if (pv_is_register (regs
[ARM_FP_REGNUM
], ARM_SP_REGNUM
))
1705 /* Frame pointer is fp. */
1706 framereg
= ARM_FP_REGNUM
;
1707 framesize
= -regs
[ARM_FP_REGNUM
].k
;
1711 /* Try the stack pointer... this is a bit desperate. */
1712 framereg
= ARM_SP_REGNUM
;
1713 framesize
= -regs
[ARM_SP_REGNUM
].k
;
1716 cache
->framereg
= framereg
;
1717 cache
->framesize
= framesize
;
1719 for (regno
= 0; regno
< ARM_FPS_REGNUM
; regno
++)
1720 if (stack
.find_reg (gdbarch
, regno
, &offset
))
1721 cache
->saved_regs
[regno
].addr
= offset
;
1725 fprintf_unfiltered (gdb_stdlog
, "Prologue scan stopped at %s\n",
1726 paddress (gdbarch
, unrecognized_pc
));
1728 return unrecognized_pc
;
1732 arm_scan_prologue (struct frame_info
*this_frame
,
1733 struct arm_prologue_cache
*cache
)
1735 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
1736 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
1737 CORE_ADDR prologue_start
, prologue_end
;
1738 CORE_ADDR prev_pc
= get_frame_pc (this_frame
);
1739 CORE_ADDR block_addr
= get_frame_address_in_block (this_frame
);
1741 /* Assume there is no frame until proven otherwise. */
1742 cache
->framereg
= ARM_SP_REGNUM
;
1743 cache
->framesize
= 0;
1745 /* Check for Thumb prologue. */
1746 if (arm_frame_is_thumb (this_frame
))
1748 thumb_scan_prologue (gdbarch
, prev_pc
, block_addr
, cache
);
1752 /* Find the function prologue. If we can't find the function in
1753 the symbol table, peek in the stack frame to find the PC. */
1754 if (find_pc_partial_function (block_addr
, NULL
, &prologue_start
,
1757 /* One way to find the end of the prologue (which works well
1758 for unoptimized code) is to do the following:
1760 struct symtab_and_line sal = find_pc_line (prologue_start, 0);
1763 prologue_end = prev_pc;
1764 else if (sal.end < prologue_end)
1765 prologue_end = sal.end;
1767 This mechanism is very accurate so long as the optimizer
1768 doesn't move any instructions from the function body into the
1769 prologue. If this happens, sal.end will be the last
1770 instruction in the first hunk of prologue code just before
1771 the first instruction that the scheduler has moved from
1772 the body to the prologue.
1774 In order to make sure that we scan all of the prologue
1775 instructions, we use a slightly less accurate mechanism which
1776 may scan more than necessary. To help compensate for this
1777 lack of accuracy, the prologue scanning loop below contains
1778 several clauses which'll cause the loop to terminate early if
1779 an implausible prologue instruction is encountered.
1785 is a suitable endpoint since it accounts for the largest
1786 possible prologue plus up to five instructions inserted by
1789 if (prologue_end
> prologue_start
+ 64)
1791 prologue_end
= prologue_start
+ 64; /* See above. */
1796 /* We have no symbol information. Our only option is to assume this
1797 function has a standard stack frame and the normal frame register.
1798 Then, we can find the value of our frame pointer on entrance to
1799 the callee (or at the present moment if this is the innermost frame).
1800 The value stored there should be the address of the stmfd + 8. */
1801 CORE_ADDR frame_loc
;
1802 ULONGEST return_value
;
1804 frame_loc
= get_frame_register_unsigned (this_frame
, ARM_FP_REGNUM
);
1805 if (!safe_read_memory_unsigned_integer (frame_loc
, 4, byte_order
,
1810 prologue_start
= gdbarch_addr_bits_remove
1811 (gdbarch
, return_value
) - 8;
1812 prologue_end
= prologue_start
+ 64; /* See above. */
1816 if (prev_pc
< prologue_end
)
1817 prologue_end
= prev_pc
;
1819 arm_analyze_prologue (gdbarch
, prologue_start
, prologue_end
, cache
);
1822 static struct arm_prologue_cache
*
1823 arm_make_prologue_cache (struct frame_info
*this_frame
)
1826 struct arm_prologue_cache
*cache
;
1827 CORE_ADDR unwound_fp
;
1829 cache
= FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache
);
1830 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
1832 arm_scan_prologue (this_frame
, cache
);
1834 unwound_fp
= get_frame_register_unsigned (this_frame
, cache
->framereg
);
1835 if (unwound_fp
== 0)
1838 cache
->prev_sp
= unwound_fp
+ cache
->framesize
;
1840 /* Calculate actual addresses of saved registers using offsets
1841 determined by arm_scan_prologue. */
1842 for (reg
= 0; reg
< gdbarch_num_regs (get_frame_arch (this_frame
)); reg
++)
1843 if (trad_frame_addr_p (cache
->saved_regs
, reg
))
1844 cache
->saved_regs
[reg
].addr
+= cache
->prev_sp
;
1849 /* Implementation of the stop_reason hook for arm_prologue frames. */
1851 static enum unwind_stop_reason
1852 arm_prologue_unwind_stop_reason (struct frame_info
*this_frame
,
1855 struct arm_prologue_cache
*cache
;
1858 if (*this_cache
== NULL
)
1859 *this_cache
= arm_make_prologue_cache (this_frame
);
1860 cache
= (struct arm_prologue_cache
*) *this_cache
;
1862 /* This is meant to halt the backtrace at "_start". */
1863 pc
= get_frame_pc (this_frame
);
1864 if (pc
<= gdbarch_tdep (get_frame_arch (this_frame
))->lowest_pc
)
1865 return UNWIND_OUTERMOST
;
1867 /* If we've hit a wall, stop. */
1868 if (cache
->prev_sp
== 0)
1869 return UNWIND_OUTERMOST
;
1871 return UNWIND_NO_REASON
;
1874 /* Our frame ID for a normal frame is the current function's starting PC
1875 and the caller's SP when we were called. */
1878 arm_prologue_this_id (struct frame_info
*this_frame
,
1880 struct frame_id
*this_id
)
1882 struct arm_prologue_cache
*cache
;
1886 if (*this_cache
== NULL
)
1887 *this_cache
= arm_make_prologue_cache (this_frame
);
1888 cache
= (struct arm_prologue_cache
*) *this_cache
;
1890 /* Use function start address as part of the frame ID. If we cannot
1891 identify the start address (due to missing symbol information),
1892 fall back to just using the current PC. */
1893 pc
= get_frame_pc (this_frame
);
1894 func
= get_frame_func (this_frame
);
1898 id
= frame_id_build (cache
->prev_sp
, func
);
1902 static struct value
*
1903 arm_prologue_prev_register (struct frame_info
*this_frame
,
1907 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
1908 struct arm_prologue_cache
*cache
;
1910 if (*this_cache
== NULL
)
1911 *this_cache
= arm_make_prologue_cache (this_frame
);
1912 cache
= (struct arm_prologue_cache
*) *this_cache
;
1914 /* If we are asked to unwind the PC, then we need to return the LR
1915 instead. The prologue may save PC, but it will point into this
1916 frame's prologue, not the next frame's resume location. Also
1917 strip the saved T bit. A valid LR may have the low bit set, but
1918 a valid PC never does. */
1919 if (prev_regnum
== ARM_PC_REGNUM
)
1923 lr
= frame_unwind_register_unsigned (this_frame
, ARM_LR_REGNUM
);
1924 return frame_unwind_got_constant (this_frame
, prev_regnum
,
1925 arm_addr_bits_remove (gdbarch
, lr
));
1928 /* SP is generally not saved to the stack, but this frame is
1929 identified by the next frame's stack pointer at the time of the call.
1930 The value was already reconstructed into PREV_SP. */
1931 if (prev_regnum
== ARM_SP_REGNUM
)
1932 return frame_unwind_got_constant (this_frame
, prev_regnum
, cache
->prev_sp
);
1934 /* The CPSR may have been changed by the call instruction and by the
1935 called function. The only bit we can reconstruct is the T bit,
1936 by checking the low bit of LR as of the call. This is a reliable
1937 indicator of Thumb-ness except for some ARM v4T pre-interworking
1938 Thumb code, which could get away with a clear low bit as long as
1939 the called function did not use bx. Guess that all other
1940 bits are unchanged; the condition flags are presumably lost,
1941 but the processor status is likely valid. */
1942 if (prev_regnum
== ARM_PS_REGNUM
)
1945 ULONGEST t_bit
= arm_psr_thumb_bit (gdbarch
);
1947 cpsr
= get_frame_register_unsigned (this_frame
, prev_regnum
);
1948 lr
= frame_unwind_register_unsigned (this_frame
, ARM_LR_REGNUM
);
1949 if (IS_THUMB_ADDR (lr
))
1953 return frame_unwind_got_constant (this_frame
, prev_regnum
, cpsr
);
1956 return trad_frame_get_prev_register (this_frame
, cache
->saved_regs
,
1960 struct frame_unwind arm_prologue_unwind
= {
1962 arm_prologue_unwind_stop_reason
,
1963 arm_prologue_this_id
,
1964 arm_prologue_prev_register
,
1966 default_frame_sniffer
1969 /* Maintain a list of ARM exception table entries per objfile, similar to the
1970 list of mapping symbols. We only cache entries for standard ARM-defined
1971 personality routines; the cache will contain only the frame unwinding
1972 instructions associated with the entry (not the descriptors). */
1974 static const struct objfile_data
*arm_exidx_data_key
;
1976 struct arm_exidx_entry
1981 typedef struct arm_exidx_entry arm_exidx_entry_s
;
1982 DEF_VEC_O(arm_exidx_entry_s
);
1984 struct arm_exidx_data
1986 VEC(arm_exidx_entry_s
) **section_maps
;
1990 arm_exidx_data_free (struct objfile
*objfile
, void *arg
)
1992 struct arm_exidx_data
*data
= (struct arm_exidx_data
*) arg
;
1995 for (i
= 0; i
< objfile
->obfd
->section_count
; i
++)
1996 VEC_free (arm_exidx_entry_s
, data
->section_maps
[i
]);
2000 arm_compare_exidx_entries (const struct arm_exidx_entry
*lhs
,
2001 const struct arm_exidx_entry
*rhs
)
2003 return lhs
->addr
< rhs
->addr
;
2006 static struct obj_section
*
2007 arm_obj_section_from_vma (struct objfile
*objfile
, bfd_vma vma
)
2009 struct obj_section
*osect
;
2011 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
2012 if (bfd_get_section_flags (objfile
->obfd
,
2013 osect
->the_bfd_section
) & SEC_ALLOC
)
2015 bfd_vma start
, size
;
2016 start
= bfd_get_section_vma (objfile
->obfd
, osect
->the_bfd_section
);
2017 size
= bfd_get_section_size (osect
->the_bfd_section
);
2019 if (start
<= vma
&& vma
< start
+ size
)
2026 /* Parse contents of exception table and exception index sections
2027 of OBJFILE, and fill in the exception table entry cache.
2029 For each entry that refers to a standard ARM-defined personality
2030 routine, extract the frame unwinding instructions (from either
2031 the index or the table section). The unwinding instructions
2033 - extracting them from the rest of the table data
2034 - converting to host endianness
2035 - appending the implicit 0xb0 ("Finish") code
2037 The extracted and normalized instructions are stored for later
2038 retrieval by the arm_find_exidx_entry routine. */
2041 arm_exidx_new_objfile (struct objfile
*objfile
)
2043 struct arm_exidx_data
*data
;
2044 asection
*exidx
, *extab
;
2045 bfd_vma exidx_vma
= 0, extab_vma
= 0;
2048 /* If we've already touched this file, do nothing. */
2049 if (!objfile
|| objfile_data (objfile
, arm_exidx_data_key
) != NULL
)
2052 /* Read contents of exception table and index. */
2053 exidx
= bfd_get_section_by_name (objfile
->obfd
, ELF_STRING_ARM_unwind
);
2054 gdb::byte_vector exidx_data
;
2057 exidx_vma
= bfd_section_vma (objfile
->obfd
, exidx
);
2058 exidx_data
.resize (bfd_get_section_size (exidx
));
2060 if (!bfd_get_section_contents (objfile
->obfd
, exidx
,
2061 exidx_data
.data (), 0,
2062 exidx_data
.size ()))
2066 extab
= bfd_get_section_by_name (objfile
->obfd
, ".ARM.extab");
2067 gdb::byte_vector extab_data
;
2070 extab_vma
= bfd_section_vma (objfile
->obfd
, extab
);
2071 extab_data
.resize (bfd_get_section_size (extab
));
2073 if (!bfd_get_section_contents (objfile
->obfd
, extab
,
2074 extab_data
.data (), 0,
2075 extab_data
.size ()))
2079 /* Allocate exception table data structure. */
2080 data
= OBSTACK_ZALLOC (&objfile
->objfile_obstack
, struct arm_exidx_data
);
2081 set_objfile_data (objfile
, arm_exidx_data_key
, data
);
2082 data
->section_maps
= OBSTACK_CALLOC (&objfile
->objfile_obstack
,
2083 objfile
->obfd
->section_count
,
2084 VEC(arm_exidx_entry_s
) *);
2086 /* Fill in exception table. */
2087 for (i
= 0; i
< exidx_data
.size () / 8; i
++)
2089 struct arm_exidx_entry new_exidx_entry
;
2090 bfd_vma idx
= bfd_h_get_32 (objfile
->obfd
, exidx_data
.data () + i
* 8);
2091 bfd_vma val
= bfd_h_get_32 (objfile
->obfd
,
2092 exidx_data
.data () + i
* 8 + 4);
2093 bfd_vma addr
= 0, word
= 0;
2094 int n_bytes
= 0, n_words
= 0;
2095 struct obj_section
*sec
;
2096 gdb_byte
*entry
= NULL
;
2098 /* Extract address of start of function. */
2099 idx
= ((idx
& 0x7fffffff) ^ 0x40000000) - 0x40000000;
2100 idx
+= exidx_vma
+ i
* 8;
2102 /* Find section containing function and compute section offset. */
2103 sec
= arm_obj_section_from_vma (objfile
, idx
);
2106 idx
-= bfd_get_section_vma (objfile
->obfd
, sec
->the_bfd_section
);
2108 /* Determine address of exception table entry. */
2111 /* EXIDX_CANTUNWIND -- no exception table entry present. */
2113 else if ((val
& 0xff000000) == 0x80000000)
2115 /* Exception table entry embedded in .ARM.exidx
2116 -- must be short form. */
2120 else if (!(val
& 0x80000000))
2122 /* Exception table entry in .ARM.extab. */
2123 addr
= ((val
& 0x7fffffff) ^ 0x40000000) - 0x40000000;
2124 addr
+= exidx_vma
+ i
* 8 + 4;
2126 if (addr
>= extab_vma
&& addr
+ 4 <= extab_vma
+ extab_data
.size ())
2128 word
= bfd_h_get_32 (objfile
->obfd
,
2129 extab_data
.data () + addr
- extab_vma
);
2132 if ((word
& 0xff000000) == 0x80000000)
2137 else if ((word
& 0xff000000) == 0x81000000
2138 || (word
& 0xff000000) == 0x82000000)
2142 n_words
= ((word
>> 16) & 0xff);
2144 else if (!(word
& 0x80000000))
2147 struct obj_section
*pers_sec
;
2148 int gnu_personality
= 0;
2150 /* Custom personality routine. */
2151 pers
= ((word
& 0x7fffffff) ^ 0x40000000) - 0x40000000;
2152 pers
= UNMAKE_THUMB_ADDR (pers
+ addr
- 4);
2154 /* Check whether we've got one of the variants of the
2155 GNU personality routines. */
2156 pers_sec
= arm_obj_section_from_vma (objfile
, pers
);
2159 static const char *personality
[] =
2161 "__gcc_personality_v0",
2162 "__gxx_personality_v0",
2163 "__gcj_personality_v0",
2164 "__gnu_objc_personality_v0",
2168 CORE_ADDR pc
= pers
+ obj_section_offset (pers_sec
);
2171 for (k
= 0; personality
[k
]; k
++)
2172 if (lookup_minimal_symbol_by_pc_name
2173 (pc
, personality
[k
], objfile
))
2175 gnu_personality
= 1;
2180 /* If so, the next word contains a word count in the high
2181 byte, followed by the same unwind instructions as the
2182 pre-defined forms. */
2184 && addr
+ 4 <= extab_vma
+ extab_data
.size ())
2186 word
= bfd_h_get_32 (objfile
->obfd
,
2188 + addr
- extab_vma
));
2191 n_words
= ((word
>> 24) & 0xff);
2197 /* Sanity check address. */
2199 if (addr
< extab_vma
2200 || addr
+ 4 * n_words
> extab_vma
+ extab_data
.size ())
2201 n_words
= n_bytes
= 0;
2203 /* The unwind instructions reside in WORD (only the N_BYTES least
2204 significant bytes are valid), followed by N_WORDS words in the
2205 extab section starting at ADDR. */
2206 if (n_bytes
|| n_words
)
2209 = (gdb_byte
*) obstack_alloc (&objfile
->objfile_obstack
,
2210 n_bytes
+ n_words
* 4 + 1);
2213 *p
++ = (gdb_byte
) ((word
>> (8 * n_bytes
)) & 0xff);
2217 word
= bfd_h_get_32 (objfile
->obfd
,
2218 extab_data
.data () + addr
- extab_vma
);
2221 *p
++ = (gdb_byte
) ((word
>> 24) & 0xff);
2222 *p
++ = (gdb_byte
) ((word
>> 16) & 0xff);
2223 *p
++ = (gdb_byte
) ((word
>> 8) & 0xff);
2224 *p
++ = (gdb_byte
) (word
& 0xff);
2227 /* Implied "Finish" to terminate the list. */
2231 /* Push entry onto vector. They are guaranteed to always
2232 appear in order of increasing addresses. */
2233 new_exidx_entry
.addr
= idx
;
2234 new_exidx_entry
.entry
= entry
;
2235 VEC_safe_push (arm_exidx_entry_s
,
2236 data
->section_maps
[sec
->the_bfd_section
->index
],
2241 /* Search for the exception table entry covering MEMADDR. If one is found,
2242 return a pointer to its data. Otherwise, return 0. If START is non-NULL,
2243 set *START to the start of the region covered by this entry. */
2246 arm_find_exidx_entry (CORE_ADDR memaddr
, CORE_ADDR
*start
)
2248 struct obj_section
*sec
;
2250 sec
= find_pc_section (memaddr
);
2253 struct arm_exidx_data
*data
;
2254 VEC(arm_exidx_entry_s
) *map
;
2255 struct arm_exidx_entry map_key
= { memaddr
- obj_section_addr (sec
), 0 };
2258 data
= ((struct arm_exidx_data
*)
2259 objfile_data (sec
->objfile
, arm_exidx_data_key
));
2262 map
= data
->section_maps
[sec
->the_bfd_section
->index
];
2263 if (!VEC_empty (arm_exidx_entry_s
, map
))
2265 struct arm_exidx_entry
*map_sym
;
2267 idx
= VEC_lower_bound (arm_exidx_entry_s
, map
, &map_key
,
2268 arm_compare_exidx_entries
);
2270 /* VEC_lower_bound finds the earliest ordered insertion
2271 point. If the following symbol starts at this exact
2272 address, we use that; otherwise, the preceding
2273 exception table entry covers this address. */
2274 if (idx
< VEC_length (arm_exidx_entry_s
, map
))
2276 map_sym
= VEC_index (arm_exidx_entry_s
, map
, idx
);
2277 if (map_sym
->addr
== map_key
.addr
)
2280 *start
= map_sym
->addr
+ obj_section_addr (sec
);
2281 return map_sym
->entry
;
2287 map_sym
= VEC_index (arm_exidx_entry_s
, map
, idx
- 1);
2289 *start
= map_sym
->addr
+ obj_section_addr (sec
);
2290 return map_sym
->entry
;
2299 /* Given the current frame THIS_FRAME, and its associated frame unwinding
2300 instruction list from the ARM exception table entry ENTRY, allocate and
2301 return a prologue cache structure describing how to unwind this frame.
2303 Return NULL if the unwinding instruction list contains a "spare",
2304 "reserved" or "refuse to unwind" instruction as defined in section
2305 "9.3 Frame unwinding instructions" of the "Exception Handling ABI
2306 for the ARM Architecture" document. */
2308 static struct arm_prologue_cache
*
2309 arm_exidx_fill_cache (struct frame_info
*this_frame
, gdb_byte
*entry
)
2314 struct arm_prologue_cache
*cache
;
2315 cache
= FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache
);
2316 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
2322 /* Whenever we reload SP, we actually have to retrieve its
2323 actual value in the current frame. */
2326 if (trad_frame_realreg_p (cache
->saved_regs
, ARM_SP_REGNUM
))
2328 int reg
= cache
->saved_regs
[ARM_SP_REGNUM
].realreg
;
2329 vsp
= get_frame_register_unsigned (this_frame
, reg
);
2333 CORE_ADDR addr
= cache
->saved_regs
[ARM_SP_REGNUM
].addr
;
2334 vsp
= get_frame_memory_unsigned (this_frame
, addr
, 4);
2340 /* Decode next unwind instruction. */
2343 if ((insn
& 0xc0) == 0)
2345 int offset
= insn
& 0x3f;
2346 vsp
+= (offset
<< 2) + 4;
2348 else if ((insn
& 0xc0) == 0x40)
2350 int offset
= insn
& 0x3f;
2351 vsp
-= (offset
<< 2) + 4;
2353 else if ((insn
& 0xf0) == 0x80)
2355 int mask
= ((insn
& 0xf) << 8) | *entry
++;
2358 /* The special case of an all-zero mask identifies
2359 "Refuse to unwind". We return NULL to fall back
2360 to the prologue analyzer. */
2364 /* Pop registers r4..r15 under mask. */
2365 for (i
= 0; i
< 12; i
++)
2366 if (mask
& (1 << i
))
2368 cache
->saved_regs
[4 + i
].addr
= vsp
;
2372 /* Special-case popping SP -- we need to reload vsp. */
2373 if (mask
& (1 << (ARM_SP_REGNUM
- 4)))
2376 else if ((insn
& 0xf0) == 0x90)
2378 int reg
= insn
& 0xf;
2380 /* Reserved cases. */
2381 if (reg
== ARM_SP_REGNUM
|| reg
== ARM_PC_REGNUM
)
2384 /* Set SP from another register and mark VSP for reload. */
2385 cache
->saved_regs
[ARM_SP_REGNUM
] = cache
->saved_regs
[reg
];
2388 else if ((insn
& 0xf0) == 0xa0)
2390 int count
= insn
& 0x7;
2391 int pop_lr
= (insn
& 0x8) != 0;
2394 /* Pop r4..r[4+count]. */
2395 for (i
= 0; i
<= count
; i
++)
2397 cache
->saved_regs
[4 + i
].addr
= vsp
;
2401 /* If indicated by flag, pop LR as well. */
2404 cache
->saved_regs
[ARM_LR_REGNUM
].addr
= vsp
;
2408 else if (insn
== 0xb0)
2410 /* We could only have updated PC by popping into it; if so, it
2411 will show up as address. Otherwise, copy LR into PC. */
2412 if (!trad_frame_addr_p (cache
->saved_regs
, ARM_PC_REGNUM
))
2413 cache
->saved_regs
[ARM_PC_REGNUM
]
2414 = cache
->saved_regs
[ARM_LR_REGNUM
];
2419 else if (insn
== 0xb1)
2421 int mask
= *entry
++;
2424 /* All-zero mask and mask >= 16 is "spare". */
2425 if (mask
== 0 || mask
>= 16)
2428 /* Pop r0..r3 under mask. */
2429 for (i
= 0; i
< 4; i
++)
2430 if (mask
& (1 << i
))
2432 cache
->saved_regs
[i
].addr
= vsp
;
2436 else if (insn
== 0xb2)
2438 ULONGEST offset
= 0;
2443 offset
|= (*entry
& 0x7f) << shift
;
2446 while (*entry
++ & 0x80);
2448 vsp
+= 0x204 + (offset
<< 2);
2450 else if (insn
== 0xb3)
2452 int start
= *entry
>> 4;
2453 int count
= (*entry
++) & 0xf;
2456 /* Only registers D0..D15 are valid here. */
2457 if (start
+ count
>= 16)
2460 /* Pop VFP double-precision registers D[start]..D[start+count]. */
2461 for (i
= 0; i
<= count
; i
++)
2463 cache
->saved_regs
[ARM_D0_REGNUM
+ start
+ i
].addr
= vsp
;
2467 /* Add an extra 4 bytes for FSTMFDX-style stack. */
2470 else if ((insn
& 0xf8) == 0xb8)
2472 int count
= insn
& 0x7;
2475 /* Pop VFP double-precision registers D[8]..D[8+count]. */
2476 for (i
= 0; i
<= count
; i
++)
2478 cache
->saved_regs
[ARM_D0_REGNUM
+ 8 + i
].addr
= vsp
;
2482 /* Add an extra 4 bytes for FSTMFDX-style stack. */
2485 else if (insn
== 0xc6)
2487 int start
= *entry
>> 4;
2488 int count
= (*entry
++) & 0xf;
2491 /* Only registers WR0..WR15 are valid. */
2492 if (start
+ count
>= 16)
2495 /* Pop iwmmx registers WR[start]..WR[start+count]. */
2496 for (i
= 0; i
<= count
; i
++)
2498 cache
->saved_regs
[ARM_WR0_REGNUM
+ start
+ i
].addr
= vsp
;
2502 else if (insn
== 0xc7)
2504 int mask
= *entry
++;
2507 /* All-zero mask and mask >= 16 is "spare". */
2508 if (mask
== 0 || mask
>= 16)
2511 /* Pop iwmmx general-purpose registers WCGR0..WCGR3 under mask. */
2512 for (i
= 0; i
< 4; i
++)
2513 if (mask
& (1 << i
))
2515 cache
->saved_regs
[ARM_WCGR0_REGNUM
+ i
].addr
= vsp
;
2519 else if ((insn
& 0xf8) == 0xc0)
2521 int count
= insn
& 0x7;
2524 /* Pop iwmmx registers WR[10]..WR[10+count]. */
2525 for (i
= 0; i
<= count
; i
++)
2527 cache
->saved_regs
[ARM_WR0_REGNUM
+ 10 + i
].addr
= vsp
;
2531 else if (insn
== 0xc8)
2533 int start
= *entry
>> 4;
2534 int count
= (*entry
++) & 0xf;
2537 /* Only registers D0..D31 are valid. */
2538 if (start
+ count
>= 16)
2541 /* Pop VFP double-precision registers
2542 D[16+start]..D[16+start+count]. */
2543 for (i
= 0; i
<= count
; i
++)
2545 cache
->saved_regs
[ARM_D0_REGNUM
+ 16 + start
+ i
].addr
= vsp
;
2549 else if (insn
== 0xc9)
2551 int start
= *entry
>> 4;
2552 int count
= (*entry
++) & 0xf;
2555 /* Pop VFP double-precision registers D[start]..D[start+count]. */
2556 for (i
= 0; i
<= count
; i
++)
2558 cache
->saved_regs
[ARM_D0_REGNUM
+ start
+ i
].addr
= vsp
;
2562 else if ((insn
& 0xf8) == 0xd0)
2564 int count
= insn
& 0x7;
2567 /* Pop VFP double-precision registers D[8]..D[8+count]. */
2568 for (i
= 0; i
<= count
; i
++)
2570 cache
->saved_regs
[ARM_D0_REGNUM
+ 8 + i
].addr
= vsp
;
2576 /* Everything else is "spare". */
2581 /* If we restore SP from a register, assume this was the frame register.
2582 Otherwise just fall back to SP as frame register. */
2583 if (trad_frame_realreg_p (cache
->saved_regs
, ARM_SP_REGNUM
))
2584 cache
->framereg
= cache
->saved_regs
[ARM_SP_REGNUM
].realreg
;
2586 cache
->framereg
= ARM_SP_REGNUM
;
2588 /* Determine offset to previous frame. */
2590 = vsp
- get_frame_register_unsigned (this_frame
, cache
->framereg
);
2592 /* We already got the previous SP. */
2593 cache
->prev_sp
= vsp
;
2598 /* Unwinding via ARM exception table entries. Note that the sniffer
2599 already computes a filled-in prologue cache, which is then used
2600 with the same arm_prologue_this_id and arm_prologue_prev_register
2601 routines also used for prologue-parsing based unwinding. */
2604 arm_exidx_unwind_sniffer (const struct frame_unwind
*self
,
2605 struct frame_info
*this_frame
,
2606 void **this_prologue_cache
)
2608 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
2609 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
2610 CORE_ADDR addr_in_block
, exidx_region
, func_start
;
2611 struct arm_prologue_cache
*cache
;
2614 /* See if we have an ARM exception table entry covering this address. */
2615 addr_in_block
= get_frame_address_in_block (this_frame
);
2616 entry
= arm_find_exidx_entry (addr_in_block
, &exidx_region
);
2620 /* The ARM exception table does not describe unwind information
2621 for arbitrary PC values, but is guaranteed to be correct only
2622 at call sites. We have to decide here whether we want to use
2623 ARM exception table information for this frame, or fall back
2624 to using prologue parsing. (Note that if we have DWARF CFI,
2625 this sniffer isn't even called -- CFI is always preferred.)
2627 Before we make this decision, however, we check whether we
2628 actually have *symbol* information for the current frame.
2629 If not, prologue parsing would not work anyway, so we might
2630 as well use the exception table and hope for the best. */
2631 if (find_pc_partial_function (addr_in_block
, NULL
, &func_start
, NULL
))
2635 /* If the next frame is "normal", we are at a call site in this
2636 frame, so exception information is guaranteed to be valid. */
2637 if (get_next_frame (this_frame
)
2638 && get_frame_type (get_next_frame (this_frame
)) == NORMAL_FRAME
)
2641 /* We also assume exception information is valid if we're currently
2642 blocked in a system call. The system library is supposed to
2643 ensure this, so that e.g. pthread cancellation works. */
2644 if (arm_frame_is_thumb (this_frame
))
2648 if (safe_read_memory_unsigned_integer (get_frame_pc (this_frame
) - 2,
2649 2, byte_order_for_code
, &insn
)
2650 && (insn
& 0xff00) == 0xdf00 /* svc */)
2657 if (safe_read_memory_unsigned_integer (get_frame_pc (this_frame
) - 4,
2658 4, byte_order_for_code
, &insn
)
2659 && (insn
& 0x0f000000) == 0x0f000000 /* svc */)
2663 /* Bail out if we don't know that exception information is valid. */
2667 /* The ARM exception index does not mark the *end* of the region
2668 covered by the entry, and some functions will not have any entry.
2669 To correctly recognize the end of the covered region, the linker
2670 should have inserted dummy records with a CANTUNWIND marker.
2672 Unfortunately, current versions of GNU ld do not reliably do
2673 this, and thus we may have found an incorrect entry above.
2674 As a (temporary) sanity check, we only use the entry if it
2675 lies *within* the bounds of the function. Note that this check
2676 might reject perfectly valid entries that just happen to cover
2677 multiple functions; therefore this check ought to be removed
2678 once the linker is fixed. */
2679 if (func_start
> exidx_region
)
2683 /* Decode the list of unwinding instructions into a prologue cache.
2684 Note that this may fail due to e.g. a "refuse to unwind" code. */
2685 cache
= arm_exidx_fill_cache (this_frame
, entry
);
2689 *this_prologue_cache
= cache
;
2693 struct frame_unwind arm_exidx_unwind
= {
2695 default_frame_unwind_stop_reason
,
2696 arm_prologue_this_id
,
2697 arm_prologue_prev_register
,
2699 arm_exidx_unwind_sniffer
2702 static struct arm_prologue_cache
*
2703 arm_make_epilogue_frame_cache (struct frame_info
*this_frame
)
2705 struct arm_prologue_cache
*cache
;
2708 cache
= FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache
);
2709 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
2711 /* Still rely on the offset calculated from prologue. */
2712 arm_scan_prologue (this_frame
, cache
);
2714 /* Since we are in epilogue, the SP has been restored. */
2715 cache
->prev_sp
= get_frame_register_unsigned (this_frame
, ARM_SP_REGNUM
);
2717 /* Calculate actual addresses of saved registers using offsets
2718 determined by arm_scan_prologue. */
2719 for (reg
= 0; reg
< gdbarch_num_regs (get_frame_arch (this_frame
)); reg
++)
2720 if (trad_frame_addr_p (cache
->saved_regs
, reg
))
2721 cache
->saved_regs
[reg
].addr
+= cache
->prev_sp
;
2726 /* Implementation of function hook 'this_id' in
2727 'struct frame_uwnind' for epilogue unwinder. */
2730 arm_epilogue_frame_this_id (struct frame_info
*this_frame
,
2732 struct frame_id
*this_id
)
2734 struct arm_prologue_cache
*cache
;
2737 if (*this_cache
== NULL
)
2738 *this_cache
= arm_make_epilogue_frame_cache (this_frame
);
2739 cache
= (struct arm_prologue_cache
*) *this_cache
;
2741 /* Use function start address as part of the frame ID. If we cannot
2742 identify the start address (due to missing symbol information),
2743 fall back to just using the current PC. */
2744 pc
= get_frame_pc (this_frame
);
2745 func
= get_frame_func (this_frame
);
2749 (*this_id
) = frame_id_build (cache
->prev_sp
, pc
);
2752 /* Implementation of function hook 'prev_register' in
2753 'struct frame_uwnind' for epilogue unwinder. */
2755 static struct value
*
2756 arm_epilogue_frame_prev_register (struct frame_info
*this_frame
,
2757 void **this_cache
, int regnum
)
2759 if (*this_cache
== NULL
)
2760 *this_cache
= arm_make_epilogue_frame_cache (this_frame
);
2762 return arm_prologue_prev_register (this_frame
, this_cache
, regnum
);
2765 static int arm_stack_frame_destroyed_p_1 (struct gdbarch
*gdbarch
,
2767 static int thumb_stack_frame_destroyed_p (struct gdbarch
*gdbarch
,
2770 /* Implementation of function hook 'sniffer' in
2771 'struct frame_uwnind' for epilogue unwinder. */
2774 arm_epilogue_frame_sniffer (const struct frame_unwind
*self
,
2775 struct frame_info
*this_frame
,
2776 void **this_prologue_cache
)
2778 if (frame_relative_level (this_frame
) == 0)
2780 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
2781 CORE_ADDR pc
= get_frame_pc (this_frame
);
2783 if (arm_frame_is_thumb (this_frame
))
2784 return thumb_stack_frame_destroyed_p (gdbarch
, pc
);
2786 return arm_stack_frame_destroyed_p_1 (gdbarch
, pc
);
2792 /* Frame unwinder from epilogue. */
2794 static const struct frame_unwind arm_epilogue_frame_unwind
=
2797 default_frame_unwind_stop_reason
,
2798 arm_epilogue_frame_this_id
,
2799 arm_epilogue_frame_prev_register
,
2801 arm_epilogue_frame_sniffer
,
2804 /* Recognize GCC's trampoline for thumb call-indirect. If we are in a
2805 trampoline, return the target PC. Otherwise return 0.
2807 void call0a (char c, short s, int i, long l) {}
2811 (*pointer_to_call0a) (c, s, i, l);
2814 Instead of calling a stub library function _call_via_xx (xx is
2815 the register name), GCC may inline the trampoline in the object
2816 file as below (register r2 has the address of call0a).
2819 .type main, %function
2828 The trampoline 'bx r2' doesn't belong to main. */
2831 arm_skip_bx_reg (struct frame_info
*frame
, CORE_ADDR pc
)
2833 /* The heuristics of recognizing such trampoline is that FRAME is
2834 executing in Thumb mode and the instruction on PC is 'bx Rm'. */
2835 if (arm_frame_is_thumb (frame
))
2839 if (target_read_memory (pc
, buf
, 2) == 0)
2841 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
2842 enum bfd_endian byte_order_for_code
2843 = gdbarch_byte_order_for_code (gdbarch
);
2845 = extract_unsigned_integer (buf
, 2, byte_order_for_code
);
2847 if ((insn
& 0xff80) == 0x4700) /* bx <Rm> */
2850 = get_frame_register_unsigned (frame
, bits (insn
, 3, 6));
2852 /* Clear the LSB so that gdb core sets step-resume
2853 breakpoint at the right address. */
2854 return UNMAKE_THUMB_ADDR (dest
);
2862 static struct arm_prologue_cache
*
2863 arm_make_stub_cache (struct frame_info
*this_frame
)
2865 struct arm_prologue_cache
*cache
;
2867 cache
= FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache
);
2868 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
2870 cache
->prev_sp
= get_frame_register_unsigned (this_frame
, ARM_SP_REGNUM
);
2875 /* Our frame ID for a stub frame is the current SP and LR. */
2878 arm_stub_this_id (struct frame_info
*this_frame
,
2880 struct frame_id
*this_id
)
2882 struct arm_prologue_cache
*cache
;
2884 if (*this_cache
== NULL
)
2885 *this_cache
= arm_make_stub_cache (this_frame
);
2886 cache
= (struct arm_prologue_cache
*) *this_cache
;
2888 *this_id
= frame_id_build (cache
->prev_sp
, get_frame_pc (this_frame
));
2892 arm_stub_unwind_sniffer (const struct frame_unwind
*self
,
2893 struct frame_info
*this_frame
,
2894 void **this_prologue_cache
)
2896 CORE_ADDR addr_in_block
;
2898 CORE_ADDR pc
, start_addr
;
2901 addr_in_block
= get_frame_address_in_block (this_frame
);
2902 pc
= get_frame_pc (this_frame
);
2903 if (in_plt_section (addr_in_block
)
2904 /* We also use the stub winder if the target memory is unreadable
2905 to avoid having the prologue unwinder trying to read it. */
2906 || target_read_memory (pc
, dummy
, 4) != 0)
2909 if (find_pc_partial_function (pc
, &name
, &start_addr
, NULL
) == 0
2910 && arm_skip_bx_reg (this_frame
, pc
) != 0)
2916 struct frame_unwind arm_stub_unwind
= {
2918 default_frame_unwind_stop_reason
,
2920 arm_prologue_prev_register
,
2922 arm_stub_unwind_sniffer
2925 /* Put here the code to store, into CACHE->saved_regs, the addresses
2926 of the saved registers of frame described by THIS_FRAME. CACHE is
2929 static struct arm_prologue_cache
*
2930 arm_m_exception_cache (struct frame_info
*this_frame
)
2932 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
2933 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2934 struct arm_prologue_cache
*cache
;
2935 CORE_ADDR unwound_sp
;
2938 cache
= FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache
);
2939 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
2941 unwound_sp
= get_frame_register_unsigned (this_frame
,
2944 /* The hardware saves eight 32-bit words, comprising xPSR,
2945 ReturnAddress, LR (R14), R12, R3, R2, R1, R0. See details in
2946 "B1.5.6 Exception entry behavior" in
2947 "ARMv7-M Architecture Reference Manual". */
2948 cache
->saved_regs
[0].addr
= unwound_sp
;
2949 cache
->saved_regs
[1].addr
= unwound_sp
+ 4;
2950 cache
->saved_regs
[2].addr
= unwound_sp
+ 8;
2951 cache
->saved_regs
[3].addr
= unwound_sp
+ 12;
2952 cache
->saved_regs
[12].addr
= unwound_sp
+ 16;
2953 cache
->saved_regs
[14].addr
= unwound_sp
+ 20;
2954 cache
->saved_regs
[15].addr
= unwound_sp
+ 24;
2955 cache
->saved_regs
[ARM_PS_REGNUM
].addr
= unwound_sp
+ 28;
2957 /* If bit 9 of the saved xPSR is set, then there is a four-byte
2958 aligner between the top of the 32-byte stack frame and the
2959 previous context's stack pointer. */
2960 cache
->prev_sp
= unwound_sp
+ 32;
2961 if (safe_read_memory_integer (unwound_sp
+ 28, 4, byte_order
, &xpsr
)
2962 && (xpsr
& (1 << 9)) != 0)
2963 cache
->prev_sp
+= 4;
2968 /* Implementation of function hook 'this_id' in
2969 'struct frame_uwnind'. */
2972 arm_m_exception_this_id (struct frame_info
*this_frame
,
2974 struct frame_id
*this_id
)
2976 struct arm_prologue_cache
*cache
;
2978 if (*this_cache
== NULL
)
2979 *this_cache
= arm_m_exception_cache (this_frame
);
2980 cache
= (struct arm_prologue_cache
*) *this_cache
;
2982 /* Our frame ID for a stub frame is the current SP and LR. */
2983 *this_id
= frame_id_build (cache
->prev_sp
,
2984 get_frame_pc (this_frame
));
2987 /* Implementation of function hook 'prev_register' in
2988 'struct frame_uwnind'. */
2990 static struct value
*
2991 arm_m_exception_prev_register (struct frame_info
*this_frame
,
2995 struct arm_prologue_cache
*cache
;
2997 if (*this_cache
== NULL
)
2998 *this_cache
= arm_m_exception_cache (this_frame
);
2999 cache
= (struct arm_prologue_cache
*) *this_cache
;
3001 /* The value was already reconstructed into PREV_SP. */
3002 if (prev_regnum
== ARM_SP_REGNUM
)
3003 return frame_unwind_got_constant (this_frame
, prev_regnum
,
3006 return trad_frame_get_prev_register (this_frame
, cache
->saved_regs
,
3010 /* Implementation of function hook 'sniffer' in
3011 'struct frame_uwnind'. */
3014 arm_m_exception_unwind_sniffer (const struct frame_unwind
*self
,
3015 struct frame_info
*this_frame
,
3016 void **this_prologue_cache
)
3018 CORE_ADDR this_pc
= get_frame_pc (this_frame
);
3020 /* No need to check is_m; this sniffer is only registered for
3021 M-profile architectures. */
3023 /* Check if exception frame returns to a magic PC value. */
3024 return arm_m_addr_is_magic (this_pc
);
3027 /* Frame unwinder for M-profile exceptions. */
3029 struct frame_unwind arm_m_exception_unwind
=
3032 default_frame_unwind_stop_reason
,
3033 arm_m_exception_this_id
,
3034 arm_m_exception_prev_register
,
3036 arm_m_exception_unwind_sniffer
3040 arm_normal_frame_base (struct frame_info
*this_frame
, void **this_cache
)
3042 struct arm_prologue_cache
*cache
;
3044 if (*this_cache
== NULL
)
3045 *this_cache
= arm_make_prologue_cache (this_frame
);
3046 cache
= (struct arm_prologue_cache
*) *this_cache
;
3048 return cache
->prev_sp
- cache
->framesize
;
3051 struct frame_base arm_normal_base
= {
3052 &arm_prologue_unwind
,
3053 arm_normal_frame_base
,
3054 arm_normal_frame_base
,
3055 arm_normal_frame_base
3058 /* Assuming THIS_FRAME is a dummy, return the frame ID of that
3059 dummy frame. The frame ID's base needs to match the TOS value
3060 saved by save_dummy_frame_tos() and returned from
3061 arm_push_dummy_call, and the PC needs to match the dummy frame's
3064 static struct frame_id
3065 arm_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*this_frame
)
3067 return frame_id_build (get_frame_register_unsigned (this_frame
,
3069 get_frame_pc (this_frame
));
3072 /* Given THIS_FRAME, find the previous frame's resume PC (which will
3073 be used to construct the previous frame's ID, after looking up the
3074 containing function). */
3077 arm_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*this_frame
)
3080 pc
= frame_unwind_register_unsigned (this_frame
, ARM_PC_REGNUM
);
3081 return arm_addr_bits_remove (gdbarch
, pc
);
3085 arm_unwind_sp (struct gdbarch
*gdbarch
, struct frame_info
*this_frame
)
3087 return frame_unwind_register_unsigned (this_frame
, ARM_SP_REGNUM
);
3090 static struct value
*
3091 arm_dwarf2_prev_register (struct frame_info
*this_frame
, void **this_cache
,
3094 struct gdbarch
* gdbarch
= get_frame_arch (this_frame
);
3096 ULONGEST t_bit
= arm_psr_thumb_bit (gdbarch
);
3101 /* The PC is normally copied from the return column, which
3102 describes saves of LR. However, that version may have an
3103 extra bit set to indicate Thumb state. The bit is not
3105 lr
= frame_unwind_register_unsigned (this_frame
, ARM_LR_REGNUM
);
3106 return frame_unwind_got_constant (this_frame
, regnum
,
3107 arm_addr_bits_remove (gdbarch
, lr
));
3110 /* Reconstruct the T bit; see arm_prologue_prev_register for details. */
3111 cpsr
= get_frame_register_unsigned (this_frame
, regnum
);
3112 lr
= frame_unwind_register_unsigned (this_frame
, ARM_LR_REGNUM
);
3113 if (IS_THUMB_ADDR (lr
))
3117 return frame_unwind_got_constant (this_frame
, regnum
, cpsr
);
3120 internal_error (__FILE__
, __LINE__
,
3121 _("Unexpected register %d"), regnum
);
3126 arm_dwarf2_frame_init_reg (struct gdbarch
*gdbarch
, int regnum
,
3127 struct dwarf2_frame_state_reg
*reg
,
3128 struct frame_info
*this_frame
)
3134 reg
->how
= DWARF2_FRAME_REG_FN
;
3135 reg
->loc
.fn
= arm_dwarf2_prev_register
;
3138 reg
->how
= DWARF2_FRAME_REG_CFA
;
3143 /* Implement the stack_frame_destroyed_p gdbarch method. */
3146 thumb_stack_frame_destroyed_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
3148 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
3149 unsigned int insn
, insn2
;
3150 int found_return
= 0, found_stack_adjust
= 0;
3151 CORE_ADDR func_start
, func_end
;
3155 if (!find_pc_partial_function (pc
, NULL
, &func_start
, &func_end
))
3158 /* The epilogue is a sequence of instructions along the following lines:
3160 - add stack frame size to SP or FP
3161 - [if frame pointer used] restore SP from FP
3162 - restore registers from SP [may include PC]
3163 - a return-type instruction [if PC wasn't already restored]
3165 In a first pass, we scan forward from the current PC and verify the
3166 instructions we find as compatible with this sequence, ending in a
3169 However, this is not sufficient to distinguish indirect function calls
3170 within a function from indirect tail calls in the epilogue in some cases.
3171 Therefore, if we didn't already find any SP-changing instruction during
3172 forward scan, we add a backward scanning heuristic to ensure we actually
3173 are in the epilogue. */
3176 while (scan_pc
< func_end
&& !found_return
)
3178 if (target_read_memory (scan_pc
, buf
, 2))
3182 insn
= extract_unsigned_integer (buf
, 2, byte_order_for_code
);
3184 if ((insn
& 0xff80) == 0x4700) /* bx <Rm> */
3186 else if (insn
== 0x46f7) /* mov pc, lr */
3188 else if (thumb_instruction_restores_sp (insn
))
3190 if ((insn
& 0xff00) == 0xbd00) /* pop <registers, PC> */
3193 else if (thumb_insn_size (insn
) == 4) /* 32-bit Thumb-2 instruction */
3195 if (target_read_memory (scan_pc
, buf
, 2))
3199 insn2
= extract_unsigned_integer (buf
, 2, byte_order_for_code
);
3201 if (insn
== 0xe8bd) /* ldm.w sp!, <registers> */
3203 if (insn2
& 0x8000) /* <registers> include PC. */
3206 else if (insn
== 0xf85d /* ldr.w <Rt>, [sp], #4 */
3207 && (insn2
& 0x0fff) == 0x0b04)
3209 if ((insn2
& 0xf000) == 0xf000) /* <Rt> is PC. */
3212 else if ((insn
& 0xffbf) == 0xecbd /* vldm sp!, <list> */
3213 && (insn2
& 0x0e00) == 0x0a00)
3225 /* Since any instruction in the epilogue sequence, with the possible
3226 exception of return itself, updates the stack pointer, we need to
3227 scan backwards for at most one instruction. Try either a 16-bit or
3228 a 32-bit instruction. This is just a heuristic, so we do not worry
3229 too much about false positives. */
3231 if (pc
- 4 < func_start
)
3233 if (target_read_memory (pc
- 4, buf
, 4))
3236 insn
= extract_unsigned_integer (buf
, 2, byte_order_for_code
);
3237 insn2
= extract_unsigned_integer (buf
+ 2, 2, byte_order_for_code
);
3239 if (thumb_instruction_restores_sp (insn2
))
3240 found_stack_adjust
= 1;
3241 else if (insn
== 0xe8bd) /* ldm.w sp!, <registers> */
3242 found_stack_adjust
= 1;
3243 else if (insn
== 0xf85d /* ldr.w <Rt>, [sp], #4 */
3244 && (insn2
& 0x0fff) == 0x0b04)
3245 found_stack_adjust
= 1;
3246 else if ((insn
& 0xffbf) == 0xecbd /* vldm sp!, <list> */
3247 && (insn2
& 0x0e00) == 0x0a00)
3248 found_stack_adjust
= 1;
3250 return found_stack_adjust
;
3254 arm_stack_frame_destroyed_p_1 (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
3256 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
3259 CORE_ADDR func_start
, func_end
;
3261 if (!find_pc_partial_function (pc
, NULL
, &func_start
, &func_end
))
3264 /* We are in the epilogue if the previous instruction was a stack
3265 adjustment and the next instruction is a possible return (bx, mov
3266 pc, or pop). We could have to scan backwards to find the stack
3267 adjustment, or forwards to find the return, but this is a decent
3268 approximation. First scan forwards. */
3271 insn
= read_memory_unsigned_integer (pc
, 4, byte_order_for_code
);
3272 if (bits (insn
, 28, 31) != INST_NV
)
3274 if ((insn
& 0x0ffffff0) == 0x012fff10)
3277 else if ((insn
& 0x0ffffff0) == 0x01a0f000)
3280 else if ((insn
& 0x0fff0000) == 0x08bd0000
3281 && (insn
& 0x0000c000) != 0)
3282 /* POP (LDMIA), including PC or LR. */
3289 /* Scan backwards. This is just a heuristic, so do not worry about
3290 false positives from mode changes. */
3292 if (pc
< func_start
+ 4)
3295 insn
= read_memory_unsigned_integer (pc
- 4, 4, byte_order_for_code
);
3296 if (arm_instruction_restores_sp (insn
))
3302 /* Implement the stack_frame_destroyed_p gdbarch method. */
3305 arm_stack_frame_destroyed_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
3307 if (arm_pc_is_thumb (gdbarch
, pc
))
3308 return thumb_stack_frame_destroyed_p (gdbarch
, pc
);
3310 return arm_stack_frame_destroyed_p_1 (gdbarch
, pc
);
3313 /* When arguments must be pushed onto the stack, they go on in reverse
3314 order. The code below implements a FILO (stack) to do this. */
3319 struct stack_item
*prev
;
3323 static struct stack_item
*
3324 push_stack_item (struct stack_item
*prev
, const gdb_byte
*contents
, int len
)
3326 struct stack_item
*si
;
3327 si
= XNEW (struct stack_item
);
3328 si
->data
= (gdb_byte
*) xmalloc (len
);
3331 memcpy (si
->data
, contents
, len
);
3335 static struct stack_item
*
3336 pop_stack_item (struct stack_item
*si
)
3338 struct stack_item
*dead
= si
;
3346 /* Return the alignment (in bytes) of the given type. */
3349 arm_type_align (struct type
*t
)
3355 t
= check_typedef (t
);
3356 switch (TYPE_CODE (t
))
3359 /* Should never happen. */
3360 internal_error (__FILE__
, __LINE__
, _("unknown type alignment"));
3364 case TYPE_CODE_ENUM
:
3368 case TYPE_CODE_RANGE
:
3370 case TYPE_CODE_RVALUE_REF
:
3371 case TYPE_CODE_CHAR
:
3372 case TYPE_CODE_BOOL
:
3373 return TYPE_LENGTH (t
);
3375 case TYPE_CODE_ARRAY
:
3376 if (TYPE_VECTOR (t
))
3378 /* Use the natural alignment for vector types (the same for
3379 scalar type), but the maximum alignment is 64-bit. */
3380 if (TYPE_LENGTH (t
) > 8)
3383 return TYPE_LENGTH (t
);
3386 return arm_type_align (TYPE_TARGET_TYPE (t
));
3387 case TYPE_CODE_COMPLEX
:
3388 return arm_type_align (TYPE_TARGET_TYPE (t
));
3390 case TYPE_CODE_STRUCT
:
3391 case TYPE_CODE_UNION
:
3393 for (n
= 0; n
< TYPE_NFIELDS (t
); n
++)
3395 falign
= arm_type_align (TYPE_FIELD_TYPE (t
, n
));
3403 /* Possible base types for a candidate for passing and returning in
3406 enum arm_vfp_cprc_base_type
3415 /* The length of one element of base type B. */
3418 arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b
)
3422 case VFP_CPRC_SINGLE
:
3424 case VFP_CPRC_DOUBLE
:
3426 case VFP_CPRC_VEC64
:
3428 case VFP_CPRC_VEC128
:
3431 internal_error (__FILE__
, __LINE__
, _("Invalid VFP CPRC type: %d."),
3436 /* The character ('s', 'd' or 'q') for the type of VFP register used
3437 for passing base type B. */
3440 arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b
)
3444 case VFP_CPRC_SINGLE
:
3446 case VFP_CPRC_DOUBLE
:
3448 case VFP_CPRC_VEC64
:
3450 case VFP_CPRC_VEC128
:
3453 internal_error (__FILE__
, __LINE__
, _("Invalid VFP CPRC type: %d."),
3458 /* Determine whether T may be part of a candidate for passing and
3459 returning in VFP registers, ignoring the limit on the total number
3460 of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the
3461 classification of the first valid component found; if it is not
3462 VFP_CPRC_UNKNOWN, all components must have the same classification
3463 as *BASE_TYPE. If it is found that T contains a type not permitted
3464 for passing and returning in VFP registers, a type differently
3465 classified from *BASE_TYPE, or two types differently classified
3466 from each other, return -1, otherwise return the total number of
3467 base-type elements found (possibly 0 in an empty structure or
3468 array). Vector types are not currently supported, matching the
3469 generic AAPCS support. */
3472 arm_vfp_cprc_sub_candidate (struct type
*t
,
3473 enum arm_vfp_cprc_base_type
*base_type
)
3475 t
= check_typedef (t
);
3476 switch (TYPE_CODE (t
))
3479 switch (TYPE_LENGTH (t
))
3482 if (*base_type
== VFP_CPRC_UNKNOWN
)
3483 *base_type
= VFP_CPRC_SINGLE
;
3484 else if (*base_type
!= VFP_CPRC_SINGLE
)
3489 if (*base_type
== VFP_CPRC_UNKNOWN
)
3490 *base_type
= VFP_CPRC_DOUBLE
;
3491 else if (*base_type
!= VFP_CPRC_DOUBLE
)
3500 case TYPE_CODE_COMPLEX
:
3501 /* Arguments of complex T where T is one of the types float or
3502 double get treated as if they are implemented as:
3511 switch (TYPE_LENGTH (t
))
3514 if (*base_type
== VFP_CPRC_UNKNOWN
)
3515 *base_type
= VFP_CPRC_SINGLE
;
3516 else if (*base_type
!= VFP_CPRC_SINGLE
)
3521 if (*base_type
== VFP_CPRC_UNKNOWN
)
3522 *base_type
= VFP_CPRC_DOUBLE
;
3523 else if (*base_type
!= VFP_CPRC_DOUBLE
)
3532 case TYPE_CODE_ARRAY
:
3534 if (TYPE_VECTOR (t
))
3536 /* A 64-bit or 128-bit containerized vector type are VFP
3538 switch (TYPE_LENGTH (t
))
3541 if (*base_type
== VFP_CPRC_UNKNOWN
)
3542 *base_type
= VFP_CPRC_VEC64
;
3545 if (*base_type
== VFP_CPRC_UNKNOWN
)
3546 *base_type
= VFP_CPRC_VEC128
;
3557 count
= arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t
),
3561 if (TYPE_LENGTH (t
) == 0)
3563 gdb_assert (count
== 0);
3566 else if (count
== 0)
3568 unitlen
= arm_vfp_cprc_unit_length (*base_type
);
3569 gdb_assert ((TYPE_LENGTH (t
) % unitlen
) == 0);
3570 return TYPE_LENGTH (t
) / unitlen
;
3575 case TYPE_CODE_STRUCT
:
3580 for (i
= 0; i
< TYPE_NFIELDS (t
); i
++)
3584 if (!field_is_static (&TYPE_FIELD (t
, i
)))
3585 sub_count
= arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t
, i
),
3587 if (sub_count
== -1)
3591 if (TYPE_LENGTH (t
) == 0)
3593 gdb_assert (count
== 0);
3596 else if (count
== 0)
3598 unitlen
= arm_vfp_cprc_unit_length (*base_type
);
3599 if (TYPE_LENGTH (t
) != unitlen
* count
)
3604 case TYPE_CODE_UNION
:
3609 for (i
= 0; i
< TYPE_NFIELDS (t
); i
++)
3611 int sub_count
= arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t
, i
),
3613 if (sub_count
== -1)
3615 count
= (count
> sub_count
? count
: sub_count
);
3617 if (TYPE_LENGTH (t
) == 0)
3619 gdb_assert (count
== 0);
3622 else if (count
== 0)
3624 unitlen
= arm_vfp_cprc_unit_length (*base_type
);
3625 if (TYPE_LENGTH (t
) != unitlen
* count
)
3637 /* Determine whether T is a VFP co-processor register candidate (CPRC)
3638 if passed to or returned from a non-variadic function with the VFP
3639 ABI in effect. Return 1 if it is, 0 otherwise. If it is, set
3640 *BASE_TYPE to the base type for T and *COUNT to the number of
3641 elements of that base type before returning. */
3644 arm_vfp_call_candidate (struct type
*t
, enum arm_vfp_cprc_base_type
*base_type
,
3647 enum arm_vfp_cprc_base_type b
= VFP_CPRC_UNKNOWN
;
3648 int c
= arm_vfp_cprc_sub_candidate (t
, &b
);
3649 if (c
<= 0 || c
> 4)
3656 /* Return 1 if the VFP ABI should be used for passing arguments to and
3657 returning values from a function of type FUNC_TYPE, 0
3661 arm_vfp_abi_for_function (struct gdbarch
*gdbarch
, struct type
*func_type
)
3663 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
3664 /* Variadic functions always use the base ABI. Assume that functions
3665 without debug info are not variadic. */
3666 if (func_type
&& TYPE_VARARGS (check_typedef (func_type
)))
3668 /* The VFP ABI is only supported as a variant of AAPCS. */
3669 if (tdep
->arm_abi
!= ARM_ABI_AAPCS
)
3671 return gdbarch_tdep (gdbarch
)->fp_model
== ARM_FLOAT_VFP
;
3674 /* We currently only support passing parameters in integer registers, which
3675 conforms with GCC's default model, and VFP argument passing following
3676 the VFP variant of AAPCS. Several other variants exist and
3677 we should probably support some of them based on the selected ABI. */
3680 arm_push_dummy_call (struct gdbarch
*gdbarch
, struct value
*function
,
3681 struct regcache
*regcache
, CORE_ADDR bp_addr
, int nargs
,
3682 struct value
**args
, CORE_ADDR sp
, int struct_return
,
3683 CORE_ADDR struct_addr
)
3685 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
3689 struct stack_item
*si
= NULL
;
3692 unsigned vfp_regs_free
= (1 << 16) - 1;
3694 /* Determine the type of this function and whether the VFP ABI
3696 ftype
= check_typedef (value_type (function
));
3697 if (TYPE_CODE (ftype
) == TYPE_CODE_PTR
)
3698 ftype
= check_typedef (TYPE_TARGET_TYPE (ftype
));
3699 use_vfp_abi
= arm_vfp_abi_for_function (gdbarch
, ftype
);
3701 /* Set the return address. For the ARM, the return breakpoint is
3702 always at BP_ADDR. */
3703 if (arm_pc_is_thumb (gdbarch
, bp_addr
))
3705 regcache_cooked_write_unsigned (regcache
, ARM_LR_REGNUM
, bp_addr
);
3707 /* Walk through the list of args and determine how large a temporary
3708 stack is required. Need to take care here as structs may be
3709 passed on the stack, and we have to push them. */
3712 argreg
= ARM_A1_REGNUM
;
3715 /* The struct_return pointer occupies the first parameter
3716 passing register. */
3720 fprintf_unfiltered (gdb_stdlog
, "struct return in %s = %s\n",
3721 gdbarch_register_name (gdbarch
, argreg
),
3722 paddress (gdbarch
, struct_addr
));
3723 regcache_cooked_write_unsigned (regcache
, argreg
, struct_addr
);
3727 for (argnum
= 0; argnum
< nargs
; argnum
++)
3730 struct type
*arg_type
;
3731 struct type
*target_type
;
3732 enum type_code typecode
;
3733 const bfd_byte
*val
;
3735 enum arm_vfp_cprc_base_type vfp_base_type
;
3737 int may_use_core_reg
= 1;
3739 arg_type
= check_typedef (value_type (args
[argnum
]));
3740 len
= TYPE_LENGTH (arg_type
);
3741 target_type
= TYPE_TARGET_TYPE (arg_type
);
3742 typecode
= TYPE_CODE (arg_type
);
3743 val
= value_contents (args
[argnum
]);
3745 align
= arm_type_align (arg_type
);
3746 /* Round alignment up to a whole number of words. */
3747 align
= (align
+ INT_REGISTER_SIZE
- 1) & ~(INT_REGISTER_SIZE
- 1);
3748 /* Different ABIs have different maximum alignments. */
3749 if (gdbarch_tdep (gdbarch
)->arm_abi
== ARM_ABI_APCS
)
3751 /* The APCS ABI only requires word alignment. */
3752 align
= INT_REGISTER_SIZE
;
3756 /* The AAPCS requires at most doubleword alignment. */
3757 if (align
> INT_REGISTER_SIZE
* 2)
3758 align
= INT_REGISTER_SIZE
* 2;
3762 && arm_vfp_call_candidate (arg_type
, &vfp_base_type
,
3770 /* Because this is a CPRC it cannot go in a core register or
3771 cause a core register to be skipped for alignment.
3772 Either it goes in VFP registers and the rest of this loop
3773 iteration is skipped for this argument, or it goes on the
3774 stack (and the stack alignment code is correct for this
3776 may_use_core_reg
= 0;
3778 unit_length
= arm_vfp_cprc_unit_length (vfp_base_type
);
3779 shift
= unit_length
/ 4;
3780 mask
= (1 << (shift
* vfp_base_count
)) - 1;
3781 for (regno
= 0; regno
< 16; regno
+= shift
)
3782 if (((vfp_regs_free
>> regno
) & mask
) == mask
)
3791 vfp_regs_free
&= ~(mask
<< regno
);
3792 reg_scaled
= regno
/ shift
;
3793 reg_char
= arm_vfp_cprc_reg_char (vfp_base_type
);
3794 for (i
= 0; i
< vfp_base_count
; i
++)
3798 if (reg_char
== 'q')
3799 arm_neon_quad_write (gdbarch
, regcache
, reg_scaled
+ i
,
3800 val
+ i
* unit_length
);
3803 xsnprintf (name_buf
, sizeof (name_buf
), "%c%d",
3804 reg_char
, reg_scaled
+ i
);
3805 regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
3807 regcache_cooked_write (regcache
, regnum
,
3808 val
+ i
* unit_length
);
3815 /* This CPRC could not go in VFP registers, so all VFP
3816 registers are now marked as used. */
3821 /* Push stack padding for dowubleword alignment. */
3822 if (nstack
& (align
- 1))
3824 si
= push_stack_item (si
, val
, INT_REGISTER_SIZE
);
3825 nstack
+= INT_REGISTER_SIZE
;
3828 /* Doubleword aligned quantities must go in even register pairs. */
3829 if (may_use_core_reg
3830 && argreg
<= ARM_LAST_ARG_REGNUM
3831 && align
> INT_REGISTER_SIZE
3835 /* If the argument is a pointer to a function, and it is a
3836 Thumb function, create a LOCAL copy of the value and set
3837 the THUMB bit in it. */
3838 if (TYPE_CODE_PTR
== typecode
3839 && target_type
!= NULL
3840 && TYPE_CODE_FUNC
== TYPE_CODE (check_typedef (target_type
)))
3842 CORE_ADDR regval
= extract_unsigned_integer (val
, len
, byte_order
);
3843 if (arm_pc_is_thumb (gdbarch
, regval
))
3845 bfd_byte
*copy
= (bfd_byte
*) alloca (len
);
3846 store_unsigned_integer (copy
, len
, byte_order
,
3847 MAKE_THUMB_ADDR (regval
));
3852 /* Copy the argument to general registers or the stack in
3853 register-sized pieces. Large arguments are split between
3854 registers and stack. */
3857 int partial_len
= len
< INT_REGISTER_SIZE
? len
: INT_REGISTER_SIZE
;
3859 = extract_unsigned_integer (val
, partial_len
, byte_order
);
3861 if (may_use_core_reg
&& argreg
<= ARM_LAST_ARG_REGNUM
)
3863 /* The argument is being passed in a general purpose
3865 if (byte_order
== BFD_ENDIAN_BIG
)
3866 regval
<<= (INT_REGISTER_SIZE
- partial_len
) * 8;
3868 fprintf_unfiltered (gdb_stdlog
, "arg %d in %s = 0x%s\n",
3870 gdbarch_register_name
3872 phex (regval
, INT_REGISTER_SIZE
));
3873 regcache_cooked_write_unsigned (regcache
, argreg
, regval
);
3878 gdb_byte buf
[INT_REGISTER_SIZE
];
3880 memset (buf
, 0, sizeof (buf
));
3881 store_unsigned_integer (buf
, partial_len
, byte_order
, regval
);
3883 /* Push the arguments onto the stack. */
3885 fprintf_unfiltered (gdb_stdlog
, "arg %d @ sp + %d\n",
3887 si
= push_stack_item (si
, buf
, INT_REGISTER_SIZE
);
3888 nstack
+= INT_REGISTER_SIZE
;
3895 /* If we have an odd number of words to push, then decrement the stack
3896 by one word now, so first stack argument will be dword aligned. */
3903 write_memory (sp
, si
->data
, si
->len
);
3904 si
= pop_stack_item (si
);
3907 /* Finally, update teh SP register. */
3908 regcache_cooked_write_unsigned (regcache
, ARM_SP_REGNUM
, sp
);
3914 /* Always align the frame to an 8-byte boundary. This is required on
3915 some platforms and harmless on the rest. */
3918 arm_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR sp
)
3920 /* Align the stack to eight bytes. */
3921 return sp
& ~ (CORE_ADDR
) 7;
3925 print_fpu_flags (struct ui_file
*file
, int flags
)
3927 if (flags
& (1 << 0))
3928 fputs_filtered ("IVO ", file
);
3929 if (flags
& (1 << 1))
3930 fputs_filtered ("DVZ ", file
);
3931 if (flags
& (1 << 2))
3932 fputs_filtered ("OFL ", file
);
3933 if (flags
& (1 << 3))
3934 fputs_filtered ("UFL ", file
);
3935 if (flags
& (1 << 4))
3936 fputs_filtered ("INX ", file
);
3937 fputc_filtered ('\n', file
);
3940 /* Print interesting information about the floating point processor
3941 (if present) or emulator. */
3943 arm_print_float_info (struct gdbarch
*gdbarch
, struct ui_file
*file
,
3944 struct frame_info
*frame
, const char *args
)
3946 unsigned long status
= get_frame_register_unsigned (frame
, ARM_FPS_REGNUM
);
3949 type
= (status
>> 24) & 127;
3950 if (status
& (1 << 31))
3951 fprintf_filtered (file
, _("Hardware FPU type %d\n"), type
);
3953 fprintf_filtered (file
, _("Software FPU type %d\n"), type
);
3954 /* i18n: [floating point unit] mask */
3955 fputs_filtered (_("mask: "), file
);
3956 print_fpu_flags (file
, status
>> 16);
3957 /* i18n: [floating point unit] flags */
3958 fputs_filtered (_("flags: "), file
);
3959 print_fpu_flags (file
, status
);
3962 /* Construct the ARM extended floating point type. */
3963 static struct type
*
3964 arm_ext_type (struct gdbarch
*gdbarch
)
3966 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
3968 if (!tdep
->arm_ext_type
)
3970 = arch_float_type (gdbarch
, -1, "builtin_type_arm_ext",
3971 floatformats_arm_ext
);
3973 return tdep
->arm_ext_type
;
3976 static struct type
*
3977 arm_neon_double_type (struct gdbarch
*gdbarch
)
3979 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
3981 if (tdep
->neon_double_type
== NULL
)
3983 struct type
*t
, *elem
;
3985 t
= arch_composite_type (gdbarch
, "__gdb_builtin_type_neon_d",
3987 elem
= builtin_type (gdbarch
)->builtin_uint8
;
3988 append_composite_type_field (t
, "u8", init_vector_type (elem
, 8));
3989 elem
= builtin_type (gdbarch
)->builtin_uint16
;
3990 append_composite_type_field (t
, "u16", init_vector_type (elem
, 4));
3991 elem
= builtin_type (gdbarch
)->builtin_uint32
;
3992 append_composite_type_field (t
, "u32", init_vector_type (elem
, 2));
3993 elem
= builtin_type (gdbarch
)->builtin_uint64
;
3994 append_composite_type_field (t
, "u64", elem
);
3995 elem
= builtin_type (gdbarch
)->builtin_float
;
3996 append_composite_type_field (t
, "f32", init_vector_type (elem
, 2));
3997 elem
= builtin_type (gdbarch
)->builtin_double
;
3998 append_composite_type_field (t
, "f64", elem
);
4000 TYPE_VECTOR (t
) = 1;
4001 TYPE_NAME (t
) = "neon_d";
4002 tdep
->neon_double_type
= t
;
4005 return tdep
->neon_double_type
;
4008 /* FIXME: The vector types are not correctly ordered on big-endian
4009 targets. Just as s0 is the low bits of d0, d0[0] is also the low
4010 bits of d0 - regardless of what unit size is being held in d0. So
4011 the offset of the first uint8 in d0 is 7, but the offset of the
4012 first float is 4. This code works as-is for little-endian
4015 static struct type
*
4016 arm_neon_quad_type (struct gdbarch
*gdbarch
)
4018 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
4020 if (tdep
->neon_quad_type
== NULL
)
4022 struct type
*t
, *elem
;
4024 t
= arch_composite_type (gdbarch
, "__gdb_builtin_type_neon_q",
4026 elem
= builtin_type (gdbarch
)->builtin_uint8
;
4027 append_composite_type_field (t
, "u8", init_vector_type (elem
, 16));
4028 elem
= builtin_type (gdbarch
)->builtin_uint16
;
4029 append_composite_type_field (t
, "u16", init_vector_type (elem
, 8));
4030 elem
= builtin_type (gdbarch
)->builtin_uint32
;
4031 append_composite_type_field (t
, "u32", init_vector_type (elem
, 4));
4032 elem
= builtin_type (gdbarch
)->builtin_uint64
;
4033 append_composite_type_field (t
, "u64", init_vector_type (elem
, 2));
4034 elem
= builtin_type (gdbarch
)->builtin_float
;
4035 append_composite_type_field (t
, "f32", init_vector_type (elem
, 4));
4036 elem
= builtin_type (gdbarch
)->builtin_double
;
4037 append_composite_type_field (t
, "f64", init_vector_type (elem
, 2));
4039 TYPE_VECTOR (t
) = 1;
4040 TYPE_NAME (t
) = "neon_q";
4041 tdep
->neon_quad_type
= t
;
4044 return tdep
->neon_quad_type
;
4047 /* Return the GDB type object for the "standard" data type of data in
4050 static struct type
*
4051 arm_register_type (struct gdbarch
*gdbarch
, int regnum
)
4053 int num_regs
= gdbarch_num_regs (gdbarch
);
4055 if (gdbarch_tdep (gdbarch
)->have_vfp_pseudos
4056 && regnum
>= num_regs
&& regnum
< num_regs
+ 32)
4057 return builtin_type (gdbarch
)->builtin_float
;
4059 if (gdbarch_tdep (gdbarch
)->have_neon_pseudos
4060 && regnum
>= num_regs
+ 32 && regnum
< num_regs
+ 32 + 16)
4061 return arm_neon_quad_type (gdbarch
);
4063 /* If the target description has register information, we are only
4064 in this function so that we can override the types of
4065 double-precision registers for NEON. */
4066 if (tdesc_has_registers (gdbarch_target_desc (gdbarch
)))
4068 struct type
*t
= tdesc_register_type (gdbarch
, regnum
);
4070 if (regnum
>= ARM_D0_REGNUM
&& regnum
< ARM_D0_REGNUM
+ 32
4071 && TYPE_CODE (t
) == TYPE_CODE_FLT
4072 && gdbarch_tdep (gdbarch
)->have_neon
)
4073 return arm_neon_double_type (gdbarch
);
4078 if (regnum
>= ARM_F0_REGNUM
&& regnum
< ARM_F0_REGNUM
+ NUM_FREGS
)
4080 if (!gdbarch_tdep (gdbarch
)->have_fpa_registers
)
4081 return builtin_type (gdbarch
)->builtin_void
;
4083 return arm_ext_type (gdbarch
);
4085 else if (regnum
== ARM_SP_REGNUM
)
4086 return builtin_type (gdbarch
)->builtin_data_ptr
;
4087 else if (regnum
== ARM_PC_REGNUM
)
4088 return builtin_type (gdbarch
)->builtin_func_ptr
;
4089 else if (regnum
>= ARRAY_SIZE (arm_register_names
))
4090 /* These registers are only supported on targets which supply
4091 an XML description. */
4092 return builtin_type (gdbarch
)->builtin_int0
;
4094 return builtin_type (gdbarch
)->builtin_uint32
;
4097 /* Map a DWARF register REGNUM onto the appropriate GDB register
4101 arm_dwarf_reg_to_regnum (struct gdbarch
*gdbarch
, int reg
)
4103 /* Core integer regs. */
4104 if (reg
>= 0 && reg
<= 15)
4107 /* Legacy FPA encoding. These were once used in a way which
4108 overlapped with VFP register numbering, so their use is
4109 discouraged, but GDB doesn't support the ARM toolchain
4110 which used them for VFP. */
4111 if (reg
>= 16 && reg
<= 23)
4112 return ARM_F0_REGNUM
+ reg
- 16;
4114 /* New assignments for the FPA registers. */
4115 if (reg
>= 96 && reg
<= 103)
4116 return ARM_F0_REGNUM
+ reg
- 96;
4118 /* WMMX register assignments. */
4119 if (reg
>= 104 && reg
<= 111)
4120 return ARM_WCGR0_REGNUM
+ reg
- 104;
4122 if (reg
>= 112 && reg
<= 127)
4123 return ARM_WR0_REGNUM
+ reg
- 112;
4125 if (reg
>= 192 && reg
<= 199)
4126 return ARM_WC0_REGNUM
+ reg
- 192;
4128 /* VFP v2 registers. A double precision value is actually
4129 in d1 rather than s2, but the ABI only defines numbering
4130 for the single precision registers. This will "just work"
4131 in GDB for little endian targets (we'll read eight bytes,
4132 starting in s0 and then progressing to s1), but will be
4133 reversed on big endian targets with VFP. This won't
4134 be a problem for the new Neon quad registers; you're supposed
4135 to use DW_OP_piece for those. */
4136 if (reg
>= 64 && reg
<= 95)
4140 xsnprintf (name_buf
, sizeof (name_buf
), "s%d", reg
- 64);
4141 return user_reg_map_name_to_regnum (gdbarch
, name_buf
,
4145 /* VFP v3 / Neon registers. This range is also used for VFP v2
4146 registers, except that it now describes d0 instead of s0. */
4147 if (reg
>= 256 && reg
<= 287)
4151 xsnprintf (name_buf
, sizeof (name_buf
), "d%d", reg
- 256);
4152 return user_reg_map_name_to_regnum (gdbarch
, name_buf
,
4159 /* Map GDB internal REGNUM onto the Arm simulator register numbers. */
4161 arm_register_sim_regno (struct gdbarch
*gdbarch
, int regnum
)
4164 gdb_assert (reg
>= 0 && reg
< gdbarch_num_regs (gdbarch
));
4166 if (regnum
>= ARM_WR0_REGNUM
&& regnum
<= ARM_WR15_REGNUM
)
4167 return regnum
- ARM_WR0_REGNUM
+ SIM_ARM_IWMMXT_COP0R0_REGNUM
;
4169 if (regnum
>= ARM_WC0_REGNUM
&& regnum
<= ARM_WC7_REGNUM
)
4170 return regnum
- ARM_WC0_REGNUM
+ SIM_ARM_IWMMXT_COP1R0_REGNUM
;
4172 if (regnum
>= ARM_WCGR0_REGNUM
&& regnum
<= ARM_WCGR7_REGNUM
)
4173 return regnum
- ARM_WCGR0_REGNUM
+ SIM_ARM_IWMMXT_COP1R8_REGNUM
;
4175 if (reg
< NUM_GREGS
)
4176 return SIM_ARM_R0_REGNUM
+ reg
;
4179 if (reg
< NUM_FREGS
)
4180 return SIM_ARM_FP0_REGNUM
+ reg
;
4183 if (reg
< NUM_SREGS
)
4184 return SIM_ARM_FPS_REGNUM
+ reg
;
4187 internal_error (__FILE__
, __LINE__
, _("Bad REGNUM %d"), regnum
);
4190 /* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand
4191 the buffer to be NEW_LEN bytes ending at ENDADDR. Return
4192 NULL if an error occurs. BUF is freed. */
4195 extend_buffer_earlier (gdb_byte
*buf
, CORE_ADDR endaddr
,
4196 int old_len
, int new_len
)
4199 int bytes_to_read
= new_len
- old_len
;
4201 new_buf
= (gdb_byte
*) xmalloc (new_len
);
4202 memcpy (new_buf
+ bytes_to_read
, buf
, old_len
);
4204 if (target_read_code (endaddr
- new_len
, new_buf
, bytes_to_read
) != 0)
4212 /* An IT block is at most the 2-byte IT instruction followed by
4213 four 4-byte instructions. The furthest back we must search to
4214 find an IT block that affects the current instruction is thus
4215 2 + 3 * 4 == 14 bytes. */
4216 #define MAX_IT_BLOCK_PREFIX 14
4218 /* Use a quick scan if there are more than this many bytes of
4220 #define IT_SCAN_THRESHOLD 32
4222 /* Adjust a breakpoint's address to move breakpoints out of IT blocks.
4223 A breakpoint in an IT block may not be hit, depending on the
4226 arm_adjust_breakpoint_address (struct gdbarch
*gdbarch
, CORE_ADDR bpaddr
)
4230 CORE_ADDR boundary
, func_start
;
4232 enum bfd_endian order
= gdbarch_byte_order_for_code (gdbarch
);
4233 int i
, any
, last_it
, last_it_count
;
4235 /* If we are using BKPT breakpoints, none of this is necessary. */
4236 if (gdbarch_tdep (gdbarch
)->thumb2_breakpoint
== NULL
)
4239 /* ARM mode does not have this problem. */
4240 if (!arm_pc_is_thumb (gdbarch
, bpaddr
))
4243 /* We are setting a breakpoint in Thumb code that could potentially
4244 contain an IT block. The first step is to find how much Thumb
4245 code there is; we do not need to read outside of known Thumb
4247 map_type
= arm_find_mapping_symbol (bpaddr
, &boundary
);
4249 /* Thumb-2 code must have mapping symbols to have a chance. */
4252 bpaddr
= gdbarch_addr_bits_remove (gdbarch
, bpaddr
);
4254 if (find_pc_partial_function (bpaddr
, NULL
, &func_start
, NULL
)
4255 && func_start
> boundary
)
4256 boundary
= func_start
;
4258 /* Search for a candidate IT instruction. We have to do some fancy
4259 footwork to distinguish a real IT instruction from the second
4260 half of a 32-bit instruction, but there is no need for that if
4261 there's no candidate. */
4262 buf_len
= std::min (bpaddr
- boundary
, (CORE_ADDR
) MAX_IT_BLOCK_PREFIX
);
4264 /* No room for an IT instruction. */
4267 buf
= (gdb_byte
*) xmalloc (buf_len
);
4268 if (target_read_code (bpaddr
- buf_len
, buf
, buf_len
) != 0)
4271 for (i
= 0; i
< buf_len
; i
+= 2)
4273 unsigned short inst1
= extract_unsigned_integer (&buf
[i
], 2, order
);
4274 if ((inst1
& 0xff00) == 0xbf00 && (inst1
& 0x000f) != 0)
4287 /* OK, the code bytes before this instruction contain at least one
4288 halfword which resembles an IT instruction. We know that it's
4289 Thumb code, but there are still two possibilities. Either the
4290 halfword really is an IT instruction, or it is the second half of
4291 a 32-bit Thumb instruction. The only way we can tell is to
4292 scan forwards from a known instruction boundary. */
4293 if (bpaddr
- boundary
> IT_SCAN_THRESHOLD
)
4297 /* There's a lot of code before this instruction. Start with an
4298 optimistic search; it's easy to recognize halfwords that can
4299 not be the start of a 32-bit instruction, and use that to
4300 lock on to the instruction boundaries. */
4301 buf
= extend_buffer_earlier (buf
, bpaddr
, buf_len
, IT_SCAN_THRESHOLD
);
4304 buf_len
= IT_SCAN_THRESHOLD
;
4307 for (i
= 0; i
< buf_len
- sizeof (buf
) && ! definite
; i
+= 2)
4309 unsigned short inst1
= extract_unsigned_integer (&buf
[i
], 2, order
);
4310 if (thumb_insn_size (inst1
) == 2)
4317 /* At this point, if DEFINITE, BUF[I] is the first place we
4318 are sure that we know the instruction boundaries, and it is far
4319 enough from BPADDR that we could not miss an IT instruction
4320 affecting BPADDR. If ! DEFINITE, give up - start from a
4324 buf
= extend_buffer_earlier (buf
, bpaddr
, buf_len
,
4328 buf_len
= bpaddr
- boundary
;
4334 buf
= extend_buffer_earlier (buf
, bpaddr
, buf_len
, bpaddr
- boundary
);
4337 buf_len
= bpaddr
- boundary
;
4341 /* Scan forwards. Find the last IT instruction before BPADDR. */
4346 unsigned short inst1
= extract_unsigned_integer (&buf
[i
], 2, order
);
4348 if ((inst1
& 0xff00) == 0xbf00 && (inst1
& 0x000f) != 0)
4353 else if (inst1
& 0x0002)
4355 else if (inst1
& 0x0004)
4360 i
+= thumb_insn_size (inst1
);
4366 /* There wasn't really an IT instruction after all. */
4369 if (last_it_count
< 1)
4370 /* It was too far away. */
4373 /* This really is a trouble spot. Move the breakpoint to the IT
4375 return bpaddr
- buf_len
+ last_it
;
4378 /* ARM displaced stepping support.
4380 Generally ARM displaced stepping works as follows:
4382 1. When an instruction is to be single-stepped, it is first decoded by
4383 arm_process_displaced_insn. Depending on the type of instruction, it is
4384 then copied to a scratch location, possibly in a modified form. The
4385 copy_* set of functions performs such modification, as necessary. A
4386 breakpoint is placed after the modified instruction in the scratch space
4387 to return control to GDB. Note in particular that instructions which
4388 modify the PC will no longer do so after modification.
4390 2. The instruction is single-stepped, by setting the PC to the scratch
4391 location address, and resuming. Control returns to GDB when the
4394 3. A cleanup function (cleanup_*) is called corresponding to the copy_*
4395 function used for the current instruction. This function's job is to
4396 put the CPU/memory state back to what it would have been if the
4397 instruction had been executed unmodified in its original location. */
4399 /* NOP instruction (mov r0, r0). */
4400 #define ARM_NOP 0xe1a00000
4401 #define THUMB_NOP 0x4600
4403 /* Helper for register reads for displaced stepping. In particular, this
4404 returns the PC as it would be seen by the instruction at its original
4408 displaced_read_reg (struct regcache
*regs
, arm_displaced_step_closure
*dsc
,
4412 CORE_ADDR from
= dsc
->insn_addr
;
4414 if (regno
== ARM_PC_REGNUM
)
4416 /* Compute pipeline offset:
4417 - When executing an ARM instruction, PC reads as the address of the
4418 current instruction plus 8.
4419 - When executing a Thumb instruction, PC reads as the address of the
4420 current instruction plus 4. */
4427 if (debug_displaced
)
4428 fprintf_unfiltered (gdb_stdlog
, "displaced: read pc value %.8lx\n",
4429 (unsigned long) from
);
4430 return (ULONGEST
) from
;
4434 regcache_cooked_read_unsigned (regs
, regno
, &ret
);
4435 if (debug_displaced
)
4436 fprintf_unfiltered (gdb_stdlog
, "displaced: read r%d value %.8lx\n",
4437 regno
, (unsigned long) ret
);
4443 displaced_in_arm_mode (struct regcache
*regs
)
4446 ULONGEST t_bit
= arm_psr_thumb_bit (regs
->arch ());
4448 regcache_cooked_read_unsigned (regs
, ARM_PS_REGNUM
, &ps
);
4450 return (ps
& t_bit
) == 0;
4453 /* Write to the PC as from a branch instruction. */
4456 branch_write_pc (struct regcache
*regs
, arm_displaced_step_closure
*dsc
,
4460 /* Note: If bits 0/1 are set, this branch would be unpredictable for
4461 architecture versions < 6. */
4462 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
,
4463 val
& ~(ULONGEST
) 0x3);
4465 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
,
4466 val
& ~(ULONGEST
) 0x1);
4469 /* Write to the PC as from a branch-exchange instruction. */
4472 bx_write_pc (struct regcache
*regs
, ULONGEST val
)
4475 ULONGEST t_bit
= arm_psr_thumb_bit (regs
->arch ());
4477 regcache_cooked_read_unsigned (regs
, ARM_PS_REGNUM
, &ps
);
4481 regcache_cooked_write_unsigned (regs
, ARM_PS_REGNUM
, ps
| t_bit
);
4482 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
, val
& 0xfffffffe);
4484 else if ((val
& 2) == 0)
4486 regcache_cooked_write_unsigned (regs
, ARM_PS_REGNUM
, ps
& ~t_bit
);
4487 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
, val
);
4491 /* Unpredictable behaviour. Try to do something sensible (switch to ARM
4492 mode, align dest to 4 bytes). */
4493 warning (_("Single-stepping BX to non-word-aligned ARM instruction."));
4494 regcache_cooked_write_unsigned (regs
, ARM_PS_REGNUM
, ps
& ~t_bit
);
4495 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
, val
& 0xfffffffc);
4499 /* Write to the PC as if from a load instruction. */
4502 load_write_pc (struct regcache
*regs
, arm_displaced_step_closure
*dsc
,
4505 if (DISPLACED_STEPPING_ARCH_VERSION
>= 5)
4506 bx_write_pc (regs
, val
);
4508 branch_write_pc (regs
, dsc
, val
);
4511 /* Write to the PC as if from an ALU instruction. */
4514 alu_write_pc (struct regcache
*regs
, arm_displaced_step_closure
*dsc
,
4517 if (DISPLACED_STEPPING_ARCH_VERSION
>= 7 && !dsc
->is_thumb
)
4518 bx_write_pc (regs
, val
);
4520 branch_write_pc (regs
, dsc
, val
);
4523 /* Helper for writing to registers for displaced stepping. Writing to the PC
4524 has a varying effects depending on the instruction which does the write:
4525 this is controlled by the WRITE_PC argument. */
4528 displaced_write_reg (struct regcache
*regs
, arm_displaced_step_closure
*dsc
,
4529 int regno
, ULONGEST val
, enum pc_write_style write_pc
)
4531 if (regno
== ARM_PC_REGNUM
)
4533 if (debug_displaced
)
4534 fprintf_unfiltered (gdb_stdlog
, "displaced: writing pc %.8lx\n",
4535 (unsigned long) val
);
4538 case BRANCH_WRITE_PC
:
4539 branch_write_pc (regs
, dsc
, val
);
4543 bx_write_pc (regs
, val
);
4547 load_write_pc (regs
, dsc
, val
);
4551 alu_write_pc (regs
, dsc
, val
);
4554 case CANNOT_WRITE_PC
:
4555 warning (_("Instruction wrote to PC in an unexpected way when "
4556 "single-stepping"));
4560 internal_error (__FILE__
, __LINE__
,
4561 _("Invalid argument to displaced_write_reg"));
4564 dsc
->wrote_to_pc
= 1;
4568 if (debug_displaced
)
4569 fprintf_unfiltered (gdb_stdlog
, "displaced: writing r%d value %.8lx\n",
4570 regno
, (unsigned long) val
);
4571 regcache_cooked_write_unsigned (regs
, regno
, val
);
4575 /* This function is used to concisely determine if an instruction INSN
4576 references PC. Register fields of interest in INSN should have the
4577 corresponding fields of BITMASK set to 0b1111. The function
4578 returns return 1 if any of these fields in INSN reference the PC
4579 (also 0b1111, r15), else it returns 0. */
4582 insn_references_pc (uint32_t insn
, uint32_t bitmask
)
4584 uint32_t lowbit
= 1;
4586 while (bitmask
!= 0)
4590 for (; lowbit
&& (bitmask
& lowbit
) == 0; lowbit
<<= 1)
4596 mask
= lowbit
* 0xf;
4598 if ((insn
& mask
) == mask
)
4607 /* The simplest copy function. Many instructions have the same effect no
4608 matter what address they are executed at: in those cases, use this. */
4611 arm_copy_unmodified (struct gdbarch
*gdbarch
, uint32_t insn
,
4612 const char *iname
, arm_displaced_step_closure
*dsc
)
4614 if (debug_displaced
)
4615 fprintf_unfiltered (gdb_stdlog
, "displaced: copying insn %.8lx, "
4616 "opcode/class '%s' unmodified\n", (unsigned long) insn
,
4619 dsc
->modinsn
[0] = insn
;
4625 thumb_copy_unmodified_32bit (struct gdbarch
*gdbarch
, uint16_t insn1
,
4626 uint16_t insn2
, const char *iname
,
4627 arm_displaced_step_closure
*dsc
)
4629 if (debug_displaced
)
4630 fprintf_unfiltered (gdb_stdlog
, "displaced: copying insn %.4x %.4x, "
4631 "opcode/class '%s' unmodified\n", insn1
, insn2
,
4634 dsc
->modinsn
[0] = insn1
;
4635 dsc
->modinsn
[1] = insn2
;
4641 /* Copy 16-bit Thumb(Thumb and 16-bit Thumb-2) instruction without any
4644 thumb_copy_unmodified_16bit (struct gdbarch
*gdbarch
, uint16_t insn
,
4646 arm_displaced_step_closure
*dsc
)
4648 if (debug_displaced
)
4649 fprintf_unfiltered (gdb_stdlog
, "displaced: copying insn %.4x, "
4650 "opcode/class '%s' unmodified\n", insn
,
4653 dsc
->modinsn
[0] = insn
;
4658 /* Preload instructions with immediate offset. */
4661 cleanup_preload (struct gdbarch
*gdbarch
,
4662 struct regcache
*regs
, arm_displaced_step_closure
*dsc
)
4664 displaced_write_reg (regs
, dsc
, 0, dsc
->tmp
[0], CANNOT_WRITE_PC
);
4665 if (!dsc
->u
.preload
.immed
)
4666 displaced_write_reg (regs
, dsc
, 1, dsc
->tmp
[1], CANNOT_WRITE_PC
);
4670 install_preload (struct gdbarch
*gdbarch
, struct regcache
*regs
,
4671 arm_displaced_step_closure
*dsc
, unsigned int rn
)
4674 /* Preload instructions:
4676 {pli/pld} [rn, #+/-imm]
4678 {pli/pld} [r0, #+/-imm]. */
4680 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
4681 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
4682 displaced_write_reg (regs
, dsc
, 0, rn_val
, CANNOT_WRITE_PC
);
4683 dsc
->u
.preload
.immed
= 1;
4685 dsc
->cleanup
= &cleanup_preload
;
4689 arm_copy_preload (struct gdbarch
*gdbarch
, uint32_t insn
, struct regcache
*regs
,
4690 arm_displaced_step_closure
*dsc
)
4692 unsigned int rn
= bits (insn
, 16, 19);
4694 if (!insn_references_pc (insn
, 0x000f0000ul
))
4695 return arm_copy_unmodified (gdbarch
, insn
, "preload", dsc
);
4697 if (debug_displaced
)
4698 fprintf_unfiltered (gdb_stdlog
, "displaced: copying preload insn %.8lx\n",
4699 (unsigned long) insn
);
4701 dsc
->modinsn
[0] = insn
& 0xfff0ffff;
4703 install_preload (gdbarch
, regs
, dsc
, rn
);
4709 thumb2_copy_preload (struct gdbarch
*gdbarch
, uint16_t insn1
, uint16_t insn2
,
4710 struct regcache
*regs
, arm_displaced_step_closure
*dsc
)
4712 unsigned int rn
= bits (insn1
, 0, 3);
4713 unsigned int u_bit
= bit (insn1
, 7);
4714 int imm12
= bits (insn2
, 0, 11);
4717 if (rn
!= ARM_PC_REGNUM
)
4718 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
, "preload", dsc
);
4720 /* PC is only allowed to use in PLI (immediate,literal) Encoding T3, and
4721 PLD (literal) Encoding T1. */
4722 if (debug_displaced
)
4723 fprintf_unfiltered (gdb_stdlog
,
4724 "displaced: copying pld/pli pc (0x%x) %c imm12 %.4x\n",
4725 (unsigned int) dsc
->insn_addr
, u_bit
? '+' : '-',
4731 /* Rewrite instruction {pli/pld} PC imm12 into:
4732 Prepare: tmp[0] <- r0, tmp[1] <- r1, r0 <- pc, r1 <- imm12
4736 Cleanup: r0 <- tmp[0], r1 <- tmp[1]. */
4738 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
4739 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
4741 pc_val
= displaced_read_reg (regs
, dsc
, ARM_PC_REGNUM
);
4743 displaced_write_reg (regs
, dsc
, 0, pc_val
, CANNOT_WRITE_PC
);
4744 displaced_write_reg (regs
, dsc
, 1, imm12
, CANNOT_WRITE_PC
);
4745 dsc
->u
.preload
.immed
= 0;
4747 /* {pli/pld} [r0, r1] */
4748 dsc
->modinsn
[0] = insn1
& 0xfff0;
4749 dsc
->modinsn
[1] = 0xf001;
4752 dsc
->cleanup
= &cleanup_preload
;
4756 /* Preload instructions with register offset. */
4759 install_preload_reg(struct gdbarch
*gdbarch
, struct regcache
*regs
,
4760 arm_displaced_step_closure
*dsc
, unsigned int rn
,
4763 ULONGEST rn_val
, rm_val
;
4765 /* Preload register-offset instructions:
4767 {pli/pld} [rn, rm {, shift}]
4769 {pli/pld} [r0, r1 {, shift}]. */
4771 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
4772 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
4773 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
4774 rm_val
= displaced_read_reg (regs
, dsc
, rm
);
4775 displaced_write_reg (regs
, dsc
, 0, rn_val
, CANNOT_WRITE_PC
);
4776 displaced_write_reg (regs
, dsc
, 1, rm_val
, CANNOT_WRITE_PC
);
4777 dsc
->u
.preload
.immed
= 0;
4779 dsc
->cleanup
= &cleanup_preload
;
4783 arm_copy_preload_reg (struct gdbarch
*gdbarch
, uint32_t insn
,
4784 struct regcache
*regs
,
4785 arm_displaced_step_closure
*dsc
)
4787 unsigned int rn
= bits (insn
, 16, 19);
4788 unsigned int rm
= bits (insn
, 0, 3);
4791 if (!insn_references_pc (insn
, 0x000f000ful
))
4792 return arm_copy_unmodified (gdbarch
, insn
, "preload reg", dsc
);
4794 if (debug_displaced
)
4795 fprintf_unfiltered (gdb_stdlog
, "displaced: copying preload insn %.8lx\n",
4796 (unsigned long) insn
);
4798 dsc
->modinsn
[0] = (insn
& 0xfff0fff0) | 0x1;
4800 install_preload_reg (gdbarch
, regs
, dsc
, rn
, rm
);
4804 /* Copy/cleanup coprocessor load and store instructions. */
4807 cleanup_copro_load_store (struct gdbarch
*gdbarch
,
4808 struct regcache
*regs
,
4809 arm_displaced_step_closure
*dsc
)
4811 ULONGEST rn_val
= displaced_read_reg (regs
, dsc
, 0);
4813 displaced_write_reg (regs
, dsc
, 0, dsc
->tmp
[0], CANNOT_WRITE_PC
);
4815 if (dsc
->u
.ldst
.writeback
)
4816 displaced_write_reg (regs
, dsc
, dsc
->u
.ldst
.rn
, rn_val
, LOAD_WRITE_PC
);
4820 install_copro_load_store (struct gdbarch
*gdbarch
, struct regcache
*regs
,
4821 arm_displaced_step_closure
*dsc
,
4822 int writeback
, unsigned int rn
)
4826 /* Coprocessor load/store instructions:
4828 {stc/stc2} [<Rn>, #+/-imm] (and other immediate addressing modes)
4830 {stc/stc2} [r0, #+/-imm].
4832 ldc/ldc2 are handled identically. */
4834 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
4835 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
4836 /* PC should be 4-byte aligned. */
4837 rn_val
= rn_val
& 0xfffffffc;
4838 displaced_write_reg (regs
, dsc
, 0, rn_val
, CANNOT_WRITE_PC
);
4840 dsc
->u
.ldst
.writeback
= writeback
;
4841 dsc
->u
.ldst
.rn
= rn
;
4843 dsc
->cleanup
= &cleanup_copro_load_store
;
4847 arm_copy_copro_load_store (struct gdbarch
*gdbarch
, uint32_t insn
,
4848 struct regcache
*regs
,
4849 arm_displaced_step_closure
*dsc
)
4851 unsigned int rn
= bits (insn
, 16, 19);
4853 if (!insn_references_pc (insn
, 0x000f0000ul
))
4854 return arm_copy_unmodified (gdbarch
, insn
, "copro load/store", dsc
);
4856 if (debug_displaced
)
4857 fprintf_unfiltered (gdb_stdlog
, "displaced: copying coprocessor "
4858 "load/store insn %.8lx\n", (unsigned long) insn
);
4860 dsc
->modinsn
[0] = insn
& 0xfff0ffff;
4862 install_copro_load_store (gdbarch
, regs
, dsc
, bit (insn
, 25), rn
);
4868 thumb2_copy_copro_load_store (struct gdbarch
*gdbarch
, uint16_t insn1
,
4869 uint16_t insn2
, struct regcache
*regs
,
4870 arm_displaced_step_closure
*dsc
)
4872 unsigned int rn
= bits (insn1
, 0, 3);
4874 if (rn
!= ARM_PC_REGNUM
)
4875 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
4876 "copro load/store", dsc
);
4878 if (debug_displaced
)
4879 fprintf_unfiltered (gdb_stdlog
, "displaced: copying coprocessor "
4880 "load/store insn %.4x%.4x\n", insn1
, insn2
);
4882 dsc
->modinsn
[0] = insn1
& 0xfff0;
4883 dsc
->modinsn
[1] = insn2
;
4886 /* This function is called for copying instruction LDC/LDC2/VLDR, which
4887 doesn't support writeback, so pass 0. */
4888 install_copro_load_store (gdbarch
, regs
, dsc
, 0, rn
);
4893 /* Clean up branch instructions (actually perform the branch, by setting
4897 cleanup_branch (struct gdbarch
*gdbarch
, struct regcache
*regs
,
4898 arm_displaced_step_closure
*dsc
)
4900 uint32_t status
= displaced_read_reg (regs
, dsc
, ARM_PS_REGNUM
);
4901 int branch_taken
= condition_true (dsc
->u
.branch
.cond
, status
);
4902 enum pc_write_style write_pc
= dsc
->u
.branch
.exchange
4903 ? BX_WRITE_PC
: BRANCH_WRITE_PC
;
4908 if (dsc
->u
.branch
.link
)
4910 /* The value of LR should be the next insn of current one. In order
4911 not to confuse logic hanlding later insn `bx lr', if current insn mode
4912 is Thumb, the bit 0 of LR value should be set to 1. */
4913 ULONGEST next_insn_addr
= dsc
->insn_addr
+ dsc
->insn_size
;
4916 next_insn_addr
|= 0x1;
4918 displaced_write_reg (regs
, dsc
, ARM_LR_REGNUM
, next_insn_addr
,
4922 displaced_write_reg (regs
, dsc
, ARM_PC_REGNUM
, dsc
->u
.branch
.dest
, write_pc
);
4925 /* Copy B/BL/BLX instructions with immediate destinations. */
4928 install_b_bl_blx (struct gdbarch
*gdbarch
, struct regcache
*regs
,
4929 arm_displaced_step_closure
*dsc
,
4930 unsigned int cond
, int exchange
, int link
, long offset
)
4932 /* Implement "BL<cond> <label>" as:
4934 Preparation: cond <- instruction condition
4935 Insn: mov r0, r0 (nop)
4936 Cleanup: if (condition true) { r14 <- pc; pc <- label }.
4938 B<cond> similar, but don't set r14 in cleanup. */
4940 dsc
->u
.branch
.cond
= cond
;
4941 dsc
->u
.branch
.link
= link
;
4942 dsc
->u
.branch
.exchange
= exchange
;
4944 dsc
->u
.branch
.dest
= dsc
->insn_addr
;
4945 if (link
&& exchange
)
4946 /* For BLX, offset is computed from the Align (PC, 4). */
4947 dsc
->u
.branch
.dest
= dsc
->u
.branch
.dest
& 0xfffffffc;
4950 dsc
->u
.branch
.dest
+= 4 + offset
;
4952 dsc
->u
.branch
.dest
+= 8 + offset
;
4954 dsc
->cleanup
= &cleanup_branch
;
4957 arm_copy_b_bl_blx (struct gdbarch
*gdbarch
, uint32_t insn
,
4958 struct regcache
*regs
, arm_displaced_step_closure
*dsc
)
4960 unsigned int cond
= bits (insn
, 28, 31);
4961 int exchange
= (cond
== 0xf);
4962 int link
= exchange
|| bit (insn
, 24);
4965 if (debug_displaced
)
4966 fprintf_unfiltered (gdb_stdlog
, "displaced: copying %s immediate insn "
4967 "%.8lx\n", (exchange
) ? "blx" : (link
) ? "bl" : "b",
4968 (unsigned long) insn
);
4970 /* For BLX, set bit 0 of the destination. The cleanup_branch function will
4971 then arrange the switch into Thumb mode. */
4972 offset
= (bits (insn
, 0, 23) << 2) | (bit (insn
, 24) << 1) | 1;
4974 offset
= bits (insn
, 0, 23) << 2;
4976 if (bit (offset
, 25))
4977 offset
= offset
| ~0x3ffffff;
4979 dsc
->modinsn
[0] = ARM_NOP
;
4981 install_b_bl_blx (gdbarch
, regs
, dsc
, cond
, exchange
, link
, offset
);
4986 thumb2_copy_b_bl_blx (struct gdbarch
*gdbarch
, uint16_t insn1
,
4987 uint16_t insn2
, struct regcache
*regs
,
4988 arm_displaced_step_closure
*dsc
)
4990 int link
= bit (insn2
, 14);
4991 int exchange
= link
&& !bit (insn2
, 12);
4994 int j1
= bit (insn2
, 13);
4995 int j2
= bit (insn2
, 11);
4996 int s
= sbits (insn1
, 10, 10);
4997 int i1
= !(j1
^ bit (insn1
, 10));
4998 int i2
= !(j2
^ bit (insn1
, 10));
5000 if (!link
&& !exchange
) /* B */
5002 offset
= (bits (insn2
, 0, 10) << 1);
5003 if (bit (insn2
, 12)) /* Encoding T4 */
5005 offset
|= (bits (insn1
, 0, 9) << 12)
5011 else /* Encoding T3 */
5013 offset
|= (bits (insn1
, 0, 5) << 12)
5017 cond
= bits (insn1
, 6, 9);
5022 offset
= (bits (insn1
, 0, 9) << 12);
5023 offset
|= ((i2
<< 22) | (i1
<< 23) | (s
<< 24));
5024 offset
|= exchange
?
5025 (bits (insn2
, 1, 10) << 2) : (bits (insn2
, 0, 10) << 1);
5028 if (debug_displaced
)
5029 fprintf_unfiltered (gdb_stdlog
, "displaced: copying %s insn "
5030 "%.4x %.4x with offset %.8lx\n",
5031 link
? (exchange
) ? "blx" : "bl" : "b",
5032 insn1
, insn2
, offset
);
5034 dsc
->modinsn
[0] = THUMB_NOP
;
5036 install_b_bl_blx (gdbarch
, regs
, dsc
, cond
, exchange
, link
, offset
);
5040 /* Copy B Thumb instructions. */
5042 thumb_copy_b (struct gdbarch
*gdbarch
, uint16_t insn
,
5043 arm_displaced_step_closure
*dsc
)
5045 unsigned int cond
= 0;
5047 unsigned short bit_12_15
= bits (insn
, 12, 15);
5048 CORE_ADDR from
= dsc
->insn_addr
;
5050 if (bit_12_15
== 0xd)
5052 /* offset = SignExtend (imm8:0, 32) */
5053 offset
= sbits ((insn
<< 1), 0, 8);
5054 cond
= bits (insn
, 8, 11);
5056 else if (bit_12_15
== 0xe) /* Encoding T2 */
5058 offset
= sbits ((insn
<< 1), 0, 11);
5062 if (debug_displaced
)
5063 fprintf_unfiltered (gdb_stdlog
,
5064 "displaced: copying b immediate insn %.4x "
5065 "with offset %d\n", insn
, offset
);
5067 dsc
->u
.branch
.cond
= cond
;
5068 dsc
->u
.branch
.link
= 0;
5069 dsc
->u
.branch
.exchange
= 0;
5070 dsc
->u
.branch
.dest
= from
+ 4 + offset
;
5072 dsc
->modinsn
[0] = THUMB_NOP
;
5074 dsc
->cleanup
= &cleanup_branch
;
5079 /* Copy BX/BLX with register-specified destinations. */
5082 install_bx_blx_reg (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5083 arm_displaced_step_closure
*dsc
, int link
,
5084 unsigned int cond
, unsigned int rm
)
5086 /* Implement {BX,BLX}<cond> <reg>" as:
5088 Preparation: cond <- instruction condition
5089 Insn: mov r0, r0 (nop)
5090 Cleanup: if (condition true) { r14 <- pc; pc <- dest; }.
5092 Don't set r14 in cleanup for BX. */
5094 dsc
->u
.branch
.dest
= displaced_read_reg (regs
, dsc
, rm
);
5096 dsc
->u
.branch
.cond
= cond
;
5097 dsc
->u
.branch
.link
= link
;
5099 dsc
->u
.branch
.exchange
= 1;
5101 dsc
->cleanup
= &cleanup_branch
;
5105 arm_copy_bx_blx_reg (struct gdbarch
*gdbarch
, uint32_t insn
,
5106 struct regcache
*regs
, arm_displaced_step_closure
*dsc
)
5108 unsigned int cond
= bits (insn
, 28, 31);
5111 int link
= bit (insn
, 5);
5112 unsigned int rm
= bits (insn
, 0, 3);
5114 if (debug_displaced
)
5115 fprintf_unfiltered (gdb_stdlog
, "displaced: copying insn %.8lx",
5116 (unsigned long) insn
);
5118 dsc
->modinsn
[0] = ARM_NOP
;
5120 install_bx_blx_reg (gdbarch
, regs
, dsc
, link
, cond
, rm
);
5125 thumb_copy_bx_blx_reg (struct gdbarch
*gdbarch
, uint16_t insn
,
5126 struct regcache
*regs
,
5127 arm_displaced_step_closure
*dsc
)
5129 int link
= bit (insn
, 7);
5130 unsigned int rm
= bits (insn
, 3, 6);
5132 if (debug_displaced
)
5133 fprintf_unfiltered (gdb_stdlog
, "displaced: copying insn %.4x",
5134 (unsigned short) insn
);
5136 dsc
->modinsn
[0] = THUMB_NOP
;
5138 install_bx_blx_reg (gdbarch
, regs
, dsc
, link
, INST_AL
, rm
);
5144 /* Copy/cleanup arithmetic/logic instruction with immediate RHS. */
5147 cleanup_alu_imm (struct gdbarch
*gdbarch
,
5148 struct regcache
*regs
, arm_displaced_step_closure
*dsc
)
5150 ULONGEST rd_val
= displaced_read_reg (regs
, dsc
, 0);
5151 displaced_write_reg (regs
, dsc
, 0, dsc
->tmp
[0], CANNOT_WRITE_PC
);
5152 displaced_write_reg (regs
, dsc
, 1, dsc
->tmp
[1], CANNOT_WRITE_PC
);
5153 displaced_write_reg (regs
, dsc
, dsc
->rd
, rd_val
, ALU_WRITE_PC
);
5157 arm_copy_alu_imm (struct gdbarch
*gdbarch
, uint32_t insn
, struct regcache
*regs
,
5158 arm_displaced_step_closure
*dsc
)
5160 unsigned int rn
= bits (insn
, 16, 19);
5161 unsigned int rd
= bits (insn
, 12, 15);
5162 unsigned int op
= bits (insn
, 21, 24);
5163 int is_mov
= (op
== 0xd);
5164 ULONGEST rd_val
, rn_val
;
5166 if (!insn_references_pc (insn
, 0x000ff000ul
))
5167 return arm_copy_unmodified (gdbarch
, insn
, "ALU immediate", dsc
);
5169 if (debug_displaced
)
5170 fprintf_unfiltered (gdb_stdlog
, "displaced: copying immediate %s insn "
5171 "%.8lx\n", is_mov
? "move" : "ALU",
5172 (unsigned long) insn
);
5174 /* Instruction is of form:
5176 <op><cond> rd, [rn,] #imm
5180 Preparation: tmp1, tmp2 <- r0, r1;
5182 Insn: <op><cond> r0, r1, #imm
5183 Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2
5186 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5187 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
5188 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5189 rd_val
= displaced_read_reg (regs
, dsc
, rd
);
5190 displaced_write_reg (regs
, dsc
, 0, rd_val
, CANNOT_WRITE_PC
);
5191 displaced_write_reg (regs
, dsc
, 1, rn_val
, CANNOT_WRITE_PC
);
5195 dsc
->modinsn
[0] = insn
& 0xfff00fff;
5197 dsc
->modinsn
[0] = (insn
& 0xfff00fff) | 0x10000;
5199 dsc
->cleanup
= &cleanup_alu_imm
;
5205 thumb2_copy_alu_imm (struct gdbarch
*gdbarch
, uint16_t insn1
,
5206 uint16_t insn2
, struct regcache
*regs
,
5207 arm_displaced_step_closure
*dsc
)
5209 unsigned int op
= bits (insn1
, 5, 8);
5210 unsigned int rn
, rm
, rd
;
5211 ULONGEST rd_val
, rn_val
;
5213 rn
= bits (insn1
, 0, 3); /* Rn */
5214 rm
= bits (insn2
, 0, 3); /* Rm */
5215 rd
= bits (insn2
, 8, 11); /* Rd */
5217 /* This routine is only called for instruction MOV. */
5218 gdb_assert (op
== 0x2 && rn
== 0xf);
5220 if (rm
!= ARM_PC_REGNUM
&& rd
!= ARM_PC_REGNUM
)
5221 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
, "ALU imm", dsc
);
5223 if (debug_displaced
)
5224 fprintf_unfiltered (gdb_stdlog
, "displaced: copying reg %s insn %.4x%.4x\n",
5225 "ALU", insn1
, insn2
);
5227 /* Instruction is of form:
5229 <op><cond> rd, [rn,] #imm
5233 Preparation: tmp1, tmp2 <- r0, r1;
5235 Insn: <op><cond> r0, r1, #imm
5236 Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2
5239 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5240 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
5241 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5242 rd_val
= displaced_read_reg (regs
, dsc
, rd
);
5243 displaced_write_reg (regs
, dsc
, 0, rd_val
, CANNOT_WRITE_PC
);
5244 displaced_write_reg (regs
, dsc
, 1, rn_val
, CANNOT_WRITE_PC
);
5247 dsc
->modinsn
[0] = insn1
;
5248 dsc
->modinsn
[1] = ((insn2
& 0xf0f0) | 0x1);
5251 dsc
->cleanup
= &cleanup_alu_imm
;
5256 /* Copy/cleanup arithmetic/logic insns with register RHS. */
5259 cleanup_alu_reg (struct gdbarch
*gdbarch
,
5260 struct regcache
*regs
, arm_displaced_step_closure
*dsc
)
5265 rd_val
= displaced_read_reg (regs
, dsc
, 0);
5267 for (i
= 0; i
< 3; i
++)
5268 displaced_write_reg (regs
, dsc
, i
, dsc
->tmp
[i
], CANNOT_WRITE_PC
);
5270 displaced_write_reg (regs
, dsc
, dsc
->rd
, rd_val
, ALU_WRITE_PC
);
5274 install_alu_reg (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5275 arm_displaced_step_closure
*dsc
,
5276 unsigned int rd
, unsigned int rn
, unsigned int rm
)
5278 ULONGEST rd_val
, rn_val
, rm_val
;
5280 /* Instruction is of form:
5282 <op><cond> rd, [rn,] rm [, <shift>]
5286 Preparation: tmp1, tmp2, tmp3 <- r0, r1, r2;
5287 r0, r1, r2 <- rd, rn, rm
5288 Insn: <op><cond> r0, [r1,] r2 [, <shift>]
5289 Cleanup: rd <- r0; r0, r1, r2 <- tmp1, tmp2, tmp3
5292 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5293 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
5294 dsc
->tmp
[2] = displaced_read_reg (regs
, dsc
, 2);
5295 rd_val
= displaced_read_reg (regs
, dsc
, rd
);
5296 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5297 rm_val
= displaced_read_reg (regs
, dsc
, rm
);
5298 displaced_write_reg (regs
, dsc
, 0, rd_val
, CANNOT_WRITE_PC
);
5299 displaced_write_reg (regs
, dsc
, 1, rn_val
, CANNOT_WRITE_PC
);
5300 displaced_write_reg (regs
, dsc
, 2, rm_val
, CANNOT_WRITE_PC
);
5303 dsc
->cleanup
= &cleanup_alu_reg
;
5307 arm_copy_alu_reg (struct gdbarch
*gdbarch
, uint32_t insn
, struct regcache
*regs
,
5308 arm_displaced_step_closure
*dsc
)
5310 unsigned int op
= bits (insn
, 21, 24);
5311 int is_mov
= (op
== 0xd);
5313 if (!insn_references_pc (insn
, 0x000ff00ful
))
5314 return arm_copy_unmodified (gdbarch
, insn
, "ALU reg", dsc
);
5316 if (debug_displaced
)
5317 fprintf_unfiltered (gdb_stdlog
, "displaced: copying reg %s insn %.8lx\n",
5318 is_mov
? "move" : "ALU", (unsigned long) insn
);
5321 dsc
->modinsn
[0] = (insn
& 0xfff00ff0) | 0x2;
5323 dsc
->modinsn
[0] = (insn
& 0xfff00ff0) | 0x10002;
5325 install_alu_reg (gdbarch
, regs
, dsc
, bits (insn
, 12, 15), bits (insn
, 16, 19),
5331 thumb_copy_alu_reg (struct gdbarch
*gdbarch
, uint16_t insn
,
5332 struct regcache
*regs
,
5333 arm_displaced_step_closure
*dsc
)
5337 rm
= bits (insn
, 3, 6);
5338 rd
= (bit (insn
, 7) << 3) | bits (insn
, 0, 2);
5340 if (rd
!= ARM_PC_REGNUM
&& rm
!= ARM_PC_REGNUM
)
5341 return thumb_copy_unmodified_16bit (gdbarch
, insn
, "ALU reg", dsc
);
5343 if (debug_displaced
)
5344 fprintf_unfiltered (gdb_stdlog
, "displaced: copying ALU reg insn %.4x\n",
5345 (unsigned short) insn
);
5347 dsc
->modinsn
[0] = ((insn
& 0xff00) | 0x10);
5349 install_alu_reg (gdbarch
, regs
, dsc
, rd
, rd
, rm
);
5354 /* Cleanup/copy arithmetic/logic insns with shifted register RHS. */
5357 cleanup_alu_shifted_reg (struct gdbarch
*gdbarch
,
5358 struct regcache
*regs
,
5359 arm_displaced_step_closure
*dsc
)
5361 ULONGEST rd_val
= displaced_read_reg (regs
, dsc
, 0);
5364 for (i
= 0; i
< 4; i
++)
5365 displaced_write_reg (regs
, dsc
, i
, dsc
->tmp
[i
], CANNOT_WRITE_PC
);
5367 displaced_write_reg (regs
, dsc
, dsc
->rd
, rd_val
, ALU_WRITE_PC
);
5371 install_alu_shifted_reg (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5372 arm_displaced_step_closure
*dsc
,
5373 unsigned int rd
, unsigned int rn
, unsigned int rm
,
5377 ULONGEST rd_val
, rn_val
, rm_val
, rs_val
;
5379 /* Instruction is of form:
5381 <op><cond> rd, [rn,] rm, <shift> rs
5385 Preparation: tmp1, tmp2, tmp3, tmp4 <- r0, r1, r2, r3
5386 r0, r1, r2, r3 <- rd, rn, rm, rs
5387 Insn: <op><cond> r0, r1, r2, <shift> r3
5389 r0, r1, r2, r3 <- tmp1, tmp2, tmp3, tmp4
5393 for (i
= 0; i
< 4; i
++)
5394 dsc
->tmp
[i
] = displaced_read_reg (regs
, dsc
, i
);
5396 rd_val
= displaced_read_reg (regs
, dsc
, rd
);
5397 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5398 rm_val
= displaced_read_reg (regs
, dsc
, rm
);
5399 rs_val
= displaced_read_reg (regs
, dsc
, rs
);
5400 displaced_write_reg (regs
, dsc
, 0, rd_val
, CANNOT_WRITE_PC
);
5401 displaced_write_reg (regs
, dsc
, 1, rn_val
, CANNOT_WRITE_PC
);
5402 displaced_write_reg (regs
, dsc
, 2, rm_val
, CANNOT_WRITE_PC
);
5403 displaced_write_reg (regs
, dsc
, 3, rs_val
, CANNOT_WRITE_PC
);
5405 dsc
->cleanup
= &cleanup_alu_shifted_reg
;
5409 arm_copy_alu_shifted_reg (struct gdbarch
*gdbarch
, uint32_t insn
,
5410 struct regcache
*regs
,
5411 arm_displaced_step_closure
*dsc
)
5413 unsigned int op
= bits (insn
, 21, 24);
5414 int is_mov
= (op
== 0xd);
5415 unsigned int rd
, rn
, rm
, rs
;
5417 if (!insn_references_pc (insn
, 0x000fff0ful
))
5418 return arm_copy_unmodified (gdbarch
, insn
, "ALU shifted reg", dsc
);
5420 if (debug_displaced
)
5421 fprintf_unfiltered (gdb_stdlog
, "displaced: copying shifted reg %s insn "
5422 "%.8lx\n", is_mov
? "move" : "ALU",
5423 (unsigned long) insn
);
5425 rn
= bits (insn
, 16, 19);
5426 rm
= bits (insn
, 0, 3);
5427 rs
= bits (insn
, 8, 11);
5428 rd
= bits (insn
, 12, 15);
5431 dsc
->modinsn
[0] = (insn
& 0xfff000f0) | 0x302;
5433 dsc
->modinsn
[0] = (insn
& 0xfff000f0) | 0x10302;
5435 install_alu_shifted_reg (gdbarch
, regs
, dsc
, rd
, rn
, rm
, rs
);
5440 /* Clean up load instructions. */
5443 cleanup_load (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5444 arm_displaced_step_closure
*dsc
)
5446 ULONGEST rt_val
, rt_val2
= 0, rn_val
;
5448 rt_val
= displaced_read_reg (regs
, dsc
, 0);
5449 if (dsc
->u
.ldst
.xfersize
== 8)
5450 rt_val2
= displaced_read_reg (regs
, dsc
, 1);
5451 rn_val
= displaced_read_reg (regs
, dsc
, 2);
5453 displaced_write_reg (regs
, dsc
, 0, dsc
->tmp
[0], CANNOT_WRITE_PC
);
5454 if (dsc
->u
.ldst
.xfersize
> 4)
5455 displaced_write_reg (regs
, dsc
, 1, dsc
->tmp
[1], CANNOT_WRITE_PC
);
5456 displaced_write_reg (regs
, dsc
, 2, dsc
->tmp
[2], CANNOT_WRITE_PC
);
5457 if (!dsc
->u
.ldst
.immed
)
5458 displaced_write_reg (regs
, dsc
, 3, dsc
->tmp
[3], CANNOT_WRITE_PC
);
5460 /* Handle register writeback. */
5461 if (dsc
->u
.ldst
.writeback
)
5462 displaced_write_reg (regs
, dsc
, dsc
->u
.ldst
.rn
, rn_val
, CANNOT_WRITE_PC
);
5463 /* Put result in right place. */
5464 displaced_write_reg (regs
, dsc
, dsc
->rd
, rt_val
, LOAD_WRITE_PC
);
5465 if (dsc
->u
.ldst
.xfersize
== 8)
5466 displaced_write_reg (regs
, dsc
, dsc
->rd
+ 1, rt_val2
, LOAD_WRITE_PC
);
5469 /* Clean up store instructions. */
5472 cleanup_store (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5473 arm_displaced_step_closure
*dsc
)
5475 ULONGEST rn_val
= displaced_read_reg (regs
, dsc
, 2);
5477 displaced_write_reg (regs
, dsc
, 0, dsc
->tmp
[0], CANNOT_WRITE_PC
);
5478 if (dsc
->u
.ldst
.xfersize
> 4)
5479 displaced_write_reg (regs
, dsc
, 1, dsc
->tmp
[1], CANNOT_WRITE_PC
);
5480 displaced_write_reg (regs
, dsc
, 2, dsc
->tmp
[2], CANNOT_WRITE_PC
);
5481 if (!dsc
->u
.ldst
.immed
)
5482 displaced_write_reg (regs
, dsc
, 3, dsc
->tmp
[3], CANNOT_WRITE_PC
);
5483 if (!dsc
->u
.ldst
.restore_r4
)
5484 displaced_write_reg (regs
, dsc
, 4, dsc
->tmp
[4], CANNOT_WRITE_PC
);
5487 if (dsc
->u
.ldst
.writeback
)
5488 displaced_write_reg (regs
, dsc
, dsc
->u
.ldst
.rn
, rn_val
, CANNOT_WRITE_PC
);
5491 /* Copy "extra" load/store instructions. These are halfword/doubleword
5492 transfers, which have a different encoding to byte/word transfers. */
5495 arm_copy_extra_ld_st (struct gdbarch
*gdbarch
, uint32_t insn
, int unprivileged
,
5496 struct regcache
*regs
, arm_displaced_step_closure
*dsc
)
5498 unsigned int op1
= bits (insn
, 20, 24);
5499 unsigned int op2
= bits (insn
, 5, 6);
5500 unsigned int rt
= bits (insn
, 12, 15);
5501 unsigned int rn
= bits (insn
, 16, 19);
5502 unsigned int rm
= bits (insn
, 0, 3);
5503 char load
[12] = {0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1};
5504 char bytesize
[12] = {2, 2, 2, 2, 8, 1, 8, 1, 8, 2, 8, 2};
5505 int immed
= (op1
& 0x4) != 0;
5507 ULONGEST rt_val
, rt_val2
= 0, rn_val
, rm_val
= 0;
5509 if (!insn_references_pc (insn
, 0x000ff00ful
))
5510 return arm_copy_unmodified (gdbarch
, insn
, "extra load/store", dsc
);
5512 if (debug_displaced
)
5513 fprintf_unfiltered (gdb_stdlog
, "displaced: copying %sextra load/store "
5514 "insn %.8lx\n", unprivileged
? "unprivileged " : "",
5515 (unsigned long) insn
);
5517 opcode
= ((op2
<< 2) | (op1
& 0x1) | ((op1
& 0x4) >> 1)) - 4;
5520 internal_error (__FILE__
, __LINE__
,
5521 _("copy_extra_ld_st: instruction decode error"));
5523 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5524 dsc
->tmp
[1] = displaced_read_reg (regs
, dsc
, 1);
5525 dsc
->tmp
[2] = displaced_read_reg (regs
, dsc
, 2);
5527 dsc
->tmp
[3] = displaced_read_reg (regs
, dsc
, 3);
5529 rt_val
= displaced_read_reg (regs
, dsc
, rt
);
5530 if (bytesize
[opcode
] == 8)
5531 rt_val2
= displaced_read_reg (regs
, dsc
, rt
+ 1);
5532 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5534 rm_val
= displaced_read_reg (regs
, dsc
, rm
);
5536 displaced_write_reg (regs
, dsc
, 0, rt_val
, CANNOT_WRITE_PC
);
5537 if (bytesize
[opcode
] == 8)
5538 displaced_write_reg (regs
, dsc
, 1, rt_val2
, CANNOT_WRITE_PC
);
5539 displaced_write_reg (regs
, dsc
, 2, rn_val
, CANNOT_WRITE_PC
);
5541 displaced_write_reg (regs
, dsc
, 3, rm_val
, CANNOT_WRITE_PC
);
5544 dsc
->u
.ldst
.xfersize
= bytesize
[opcode
];
5545 dsc
->u
.ldst
.rn
= rn
;
5546 dsc
->u
.ldst
.immed
= immed
;
5547 dsc
->u
.ldst
.writeback
= bit (insn
, 24) == 0 || bit (insn
, 21) != 0;
5548 dsc
->u
.ldst
.restore_r4
= 0;
5551 /* {ldr,str}<width><cond> rt, [rt2,] [rn, #imm]
5553 {ldr,str}<width><cond> r0, [r1,] [r2, #imm]. */
5554 dsc
->modinsn
[0] = (insn
& 0xfff00fff) | 0x20000;
5556 /* {ldr,str}<width><cond> rt, [rt2,] [rn, +/-rm]
5558 {ldr,str}<width><cond> r0, [r1,] [r2, +/-r3]. */
5559 dsc
->modinsn
[0] = (insn
& 0xfff00ff0) | 0x20003;
5561 dsc
->cleanup
= load
[opcode
] ? &cleanup_load
: &cleanup_store
;
5566 /* Copy byte/half word/word loads and stores. */
5569 install_load_store (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5570 arm_displaced_step_closure
*dsc
, int load
,
5571 int immed
, int writeback
, int size
, int usermode
,
5572 int rt
, int rm
, int rn
)
5574 ULONGEST rt_val
, rn_val
, rm_val
= 0;
5576 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5577 dsc
->tmp
[2] = displaced_read_reg (regs
, dsc
, 2);
5579 dsc
->tmp
[3] = displaced_read_reg (regs
, dsc
, 3);
5581 dsc
->tmp
[4] = displaced_read_reg (regs
, dsc
, 4);
5583 rt_val
= displaced_read_reg (regs
, dsc
, rt
);
5584 rn_val
= displaced_read_reg (regs
, dsc
, rn
);
5586 rm_val
= displaced_read_reg (regs
, dsc
, rm
);
5588 displaced_write_reg (regs
, dsc
, 0, rt_val
, CANNOT_WRITE_PC
);
5589 displaced_write_reg (regs
, dsc
, 2, rn_val
, CANNOT_WRITE_PC
);
5591 displaced_write_reg (regs
, dsc
, 3, rm_val
, CANNOT_WRITE_PC
);
5593 dsc
->u
.ldst
.xfersize
= size
;
5594 dsc
->u
.ldst
.rn
= rn
;
5595 dsc
->u
.ldst
.immed
= immed
;
5596 dsc
->u
.ldst
.writeback
= writeback
;
5598 /* To write PC we can do:
5600 Before this sequence of instructions:
5601 r0 is the PC value got from displaced_read_reg, so r0 = from + 8;
5602 r2 is the Rn value got from dispalced_read_reg.
5604 Insn1: push {pc} Write address of STR instruction + offset on stack
5605 Insn2: pop {r4} Read it back from stack, r4 = addr(Insn1) + offset
5606 Insn3: sub r4, r4, pc r4 = addr(Insn1) + offset - pc
5607 = addr(Insn1) + offset - addr(Insn3) - 8
5609 Insn4: add r4, r4, #8 r4 = offset - 8
5610 Insn5: add r0, r0, r4 r0 = from + 8 + offset - 8
5612 Insn6: str r0, [r2, #imm] (or str r0, [r2, r3])
5614 Otherwise we don't know what value to write for PC, since the offset is
5615 architecture-dependent (sometimes PC+8, sometimes PC+12). More details
5616 of this can be found in Section "Saving from r15" in
5617 http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204g/Cihbjifh.html */
5619 dsc
->cleanup
= load
? &cleanup_load
: &cleanup_store
;
5624 thumb2_copy_load_literal (struct gdbarch
*gdbarch
, uint16_t insn1
,
5625 uint16_t insn2
, struct regcache
*regs
,
5626 arm_displaced_step_closure
*dsc
, int size
)
5628 unsigned int u_bit
= bit (insn1
, 7);
5629 unsigned int rt
= bits (insn2
, 12, 15);
5630 int imm12
= bits (insn2
, 0, 11);
5633 if (debug_displaced
)
5634 fprintf_unfiltered (gdb_stdlog
,
5635 "displaced: copying ldr pc (0x%x) R%d %c imm12 %.4x\n",
5636 (unsigned int) dsc
->insn_addr
, rt
, u_bit
? '+' : '-',
5642 /* Rewrite instruction LDR Rt imm12 into:
5644 Prepare: tmp[0] <- r0, tmp[1] <- r2, tmp[2] <- r3, r2 <- pc, r3 <- imm12
5648 Cleanup: rt <- r0, r0 <- tmp[0], r2 <- tmp[1], r3 <- tmp[2]. */
5651 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
5652 dsc
->tmp
[2] = displaced_read_reg (regs
, dsc
, 2);
5653 dsc
->tmp
[3] = displaced_read_reg (regs
, dsc
, 3);
5655 pc_val
= displaced_read_reg (regs
, dsc
, ARM_PC_REGNUM
);
5657 pc_val
= pc_val
& 0xfffffffc;
5659 displaced_write_reg (regs
, dsc
, 2, pc_val
, CANNOT_WRITE_PC
);
5660 displaced_write_reg (regs
, dsc
, 3, imm12
, CANNOT_WRITE_PC
);
5664 dsc
->u
.ldst
.xfersize
= size
;
5665 dsc
->u
.ldst
.immed
= 0;
5666 dsc
->u
.ldst
.writeback
= 0;
5667 dsc
->u
.ldst
.restore_r4
= 0;
5669 /* LDR R0, R2, R3 */
5670 dsc
->modinsn
[0] = 0xf852;
5671 dsc
->modinsn
[1] = 0x3;
5674 dsc
->cleanup
= &cleanup_load
;
5680 thumb2_copy_load_reg_imm (struct gdbarch
*gdbarch
, uint16_t insn1
,
5681 uint16_t insn2
, struct regcache
*regs
,
5682 arm_displaced_step_closure
*dsc
,
5683 int writeback
, int immed
)
5685 unsigned int rt
= bits (insn2
, 12, 15);
5686 unsigned int rn
= bits (insn1
, 0, 3);
5687 unsigned int rm
= bits (insn2
, 0, 3); /* Only valid if !immed. */
5688 /* In LDR (register), there is also a register Rm, which is not allowed to
5689 be PC, so we don't have to check it. */
5691 if (rt
!= ARM_PC_REGNUM
&& rn
!= ARM_PC_REGNUM
)
5692 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
, "load",
5695 if (debug_displaced
)
5696 fprintf_unfiltered (gdb_stdlog
,
5697 "displaced: copying ldr r%d [r%d] insn %.4x%.4x\n",
5698 rt
, rn
, insn1
, insn2
);
5700 install_load_store (gdbarch
, regs
, dsc
, 1, immed
, writeback
, 4,
5703 dsc
->u
.ldst
.restore_r4
= 0;
5706 /* ldr[b]<cond> rt, [rn, #imm], etc.
5708 ldr[b]<cond> r0, [r2, #imm]. */
5710 dsc
->modinsn
[0] = (insn1
& 0xfff0) | 0x2;
5711 dsc
->modinsn
[1] = insn2
& 0x0fff;
5714 /* ldr[b]<cond> rt, [rn, rm], etc.
5716 ldr[b]<cond> r0, [r2, r3]. */
5718 dsc
->modinsn
[0] = (insn1
& 0xfff0) | 0x2;
5719 dsc
->modinsn
[1] = (insn2
& 0x0ff0) | 0x3;
5729 arm_copy_ldr_str_ldrb_strb (struct gdbarch
*gdbarch
, uint32_t insn
,
5730 struct regcache
*regs
,
5731 arm_displaced_step_closure
*dsc
,
5732 int load
, int size
, int usermode
)
5734 int immed
= !bit (insn
, 25);
5735 int writeback
= (bit (insn
, 24) == 0 || bit (insn
, 21) != 0);
5736 unsigned int rt
= bits (insn
, 12, 15);
5737 unsigned int rn
= bits (insn
, 16, 19);
5738 unsigned int rm
= bits (insn
, 0, 3); /* Only valid if !immed. */
5740 if (!insn_references_pc (insn
, 0x000ff00ful
))
5741 return arm_copy_unmodified (gdbarch
, insn
, "load/store", dsc
);
5743 if (debug_displaced
)
5744 fprintf_unfiltered (gdb_stdlog
,
5745 "displaced: copying %s%s r%d [r%d] insn %.8lx\n",
5746 load
? (size
== 1 ? "ldrb" : "ldr")
5747 : (size
== 1 ? "strb" : "str"), usermode
? "t" : "",
5749 (unsigned long) insn
);
5751 install_load_store (gdbarch
, regs
, dsc
, load
, immed
, writeback
, size
,
5752 usermode
, rt
, rm
, rn
);
5754 if (load
|| rt
!= ARM_PC_REGNUM
)
5756 dsc
->u
.ldst
.restore_r4
= 0;
5759 /* {ldr,str}[b]<cond> rt, [rn, #imm], etc.
5761 {ldr,str}[b]<cond> r0, [r2, #imm]. */
5762 dsc
->modinsn
[0] = (insn
& 0xfff00fff) | 0x20000;
5764 /* {ldr,str}[b]<cond> rt, [rn, rm], etc.
5766 {ldr,str}[b]<cond> r0, [r2, r3]. */
5767 dsc
->modinsn
[0] = (insn
& 0xfff00ff0) | 0x20003;
5771 /* We need to use r4 as scratch. Make sure it's restored afterwards. */
5772 dsc
->u
.ldst
.restore_r4
= 1;
5773 dsc
->modinsn
[0] = 0xe92d8000; /* push {pc} */
5774 dsc
->modinsn
[1] = 0xe8bd0010; /* pop {r4} */
5775 dsc
->modinsn
[2] = 0xe044400f; /* sub r4, r4, pc. */
5776 dsc
->modinsn
[3] = 0xe2844008; /* add r4, r4, #8. */
5777 dsc
->modinsn
[4] = 0xe0800004; /* add r0, r0, r4. */
5781 dsc
->modinsn
[5] = (insn
& 0xfff00fff) | 0x20000;
5783 dsc
->modinsn
[5] = (insn
& 0xfff00ff0) | 0x20003;
5788 dsc
->cleanup
= load
? &cleanup_load
: &cleanup_store
;
5793 /* Cleanup LDM instructions with fully-populated register list. This is an
5794 unfortunate corner case: it's impossible to implement correctly by modifying
5795 the instruction. The issue is as follows: we have an instruction,
5799 which we must rewrite to avoid loading PC. A possible solution would be to
5800 do the load in two halves, something like (with suitable cleanup
5804 ldm[id][ab] r8!, {r0-r7}
5806 ldm[id][ab] r8, {r7-r14}
5809 but at present there's no suitable place for <temp>, since the scratch space
5810 is overwritten before the cleanup routine is called. For now, we simply
5811 emulate the instruction. */
5814 cleanup_block_load_all (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5815 arm_displaced_step_closure
*dsc
)
5817 int inc
= dsc
->u
.block
.increment
;
5818 int bump_before
= dsc
->u
.block
.before
? (inc
? 4 : -4) : 0;
5819 int bump_after
= dsc
->u
.block
.before
? 0 : (inc
? 4 : -4);
5820 uint32_t regmask
= dsc
->u
.block
.regmask
;
5821 int regno
= inc
? 0 : 15;
5822 CORE_ADDR xfer_addr
= dsc
->u
.block
.xfer_addr
;
5823 int exception_return
= dsc
->u
.block
.load
&& dsc
->u
.block
.user
5824 && (regmask
& 0x8000) != 0;
5825 uint32_t status
= displaced_read_reg (regs
, dsc
, ARM_PS_REGNUM
);
5826 int do_transfer
= condition_true (dsc
->u
.block
.cond
, status
);
5827 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
5832 /* If the instruction is ldm rN, {...pc}^, I don't think there's anything
5833 sensible we can do here. Complain loudly. */
5834 if (exception_return
)
5835 error (_("Cannot single-step exception return"));
5837 /* We don't handle any stores here for now. */
5838 gdb_assert (dsc
->u
.block
.load
!= 0);
5840 if (debug_displaced
)
5841 fprintf_unfiltered (gdb_stdlog
, "displaced: emulating block transfer: "
5842 "%s %s %s\n", dsc
->u
.block
.load
? "ldm" : "stm",
5843 dsc
->u
.block
.increment
? "inc" : "dec",
5844 dsc
->u
.block
.before
? "before" : "after");
5851 while (regno
<= ARM_PC_REGNUM
&& (regmask
& (1 << regno
)) == 0)
5854 while (regno
>= 0 && (regmask
& (1 << regno
)) == 0)
5857 xfer_addr
+= bump_before
;
5859 memword
= read_memory_unsigned_integer (xfer_addr
, 4, byte_order
);
5860 displaced_write_reg (regs
, dsc
, regno
, memword
, LOAD_WRITE_PC
);
5862 xfer_addr
+= bump_after
;
5864 regmask
&= ~(1 << regno
);
5867 if (dsc
->u
.block
.writeback
)
5868 displaced_write_reg (regs
, dsc
, dsc
->u
.block
.rn
, xfer_addr
,
5872 /* Clean up an STM which included the PC in the register list. */
5875 cleanup_block_store_pc (struct gdbarch
*gdbarch
, struct regcache
*regs
,
5876 arm_displaced_step_closure
*dsc
)
5878 uint32_t status
= displaced_read_reg (regs
, dsc
, ARM_PS_REGNUM
);
5879 int store_executed
= condition_true (dsc
->u
.block
.cond
, status
);
5880 CORE_ADDR pc_stored_at
, transferred_regs
= bitcount (dsc
->u
.block
.regmask
);
5881 CORE_ADDR stm_insn_addr
;
5884 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
5886 /* If condition code fails, there's nothing else to do. */
5887 if (!store_executed
)
5890 if (dsc
->u
.block
.increment
)
5892 pc_stored_at
= dsc
->u
.block
.xfer_addr
+ 4 * transferred_regs
;
5894 if (dsc
->u
.block
.before
)
5899 pc_stored_at
= dsc
->u
.block
.xfer_addr
;
5901 if (dsc
->u
.block
.before
)
5905 pc_val
= read_memory_unsigned_integer (pc_stored_at
, 4, byte_order
);
5906 stm_insn_addr
= dsc
->scratch_base
;
5907 offset
= pc_val
- stm_insn_addr
;
5909 if (debug_displaced
)
5910 fprintf_unfiltered (gdb_stdlog
, "displaced: detected PC offset %.8lx for "
5911 "STM instruction\n", offset
);
5913 /* Rewrite the stored PC to the proper value for the non-displaced original
5915 write_memory_unsigned_integer (pc_stored_at
, 4, byte_order
,
5916 dsc
->insn_addr
+ offset
);
5919 /* Clean up an LDM which includes the PC in the register list. We clumped all
5920 the registers in the transferred list into a contiguous range r0...rX (to
5921 avoid loading PC directly and losing control of the debugged program), so we
5922 must undo that here. */
5925 cleanup_block_load_pc (struct gdbarch
*gdbarch
,
5926 struct regcache
*regs
,
5927 arm_displaced_step_closure
*dsc
)
5929 uint32_t status
= displaced_read_reg (regs
, dsc
, ARM_PS_REGNUM
);
5930 int load_executed
= condition_true (dsc
->u
.block
.cond
, status
);
5931 unsigned int mask
= dsc
->u
.block
.regmask
, write_reg
= ARM_PC_REGNUM
;
5932 unsigned int regs_loaded
= bitcount (mask
);
5933 unsigned int num_to_shuffle
= regs_loaded
, clobbered
;
5935 /* The method employed here will fail if the register list is fully populated
5936 (we need to avoid loading PC directly). */
5937 gdb_assert (num_to_shuffle
< 16);
5942 clobbered
= (1 << num_to_shuffle
) - 1;
5944 while (num_to_shuffle
> 0)
5946 if ((mask
& (1 << write_reg
)) != 0)
5948 unsigned int read_reg
= num_to_shuffle
- 1;
5950 if (read_reg
!= write_reg
)
5952 ULONGEST rval
= displaced_read_reg (regs
, dsc
, read_reg
);
5953 displaced_write_reg (regs
, dsc
, write_reg
, rval
, LOAD_WRITE_PC
);
5954 if (debug_displaced
)
5955 fprintf_unfiltered (gdb_stdlog
, _("displaced: LDM: move "
5956 "loaded register r%d to r%d\n"), read_reg
,
5959 else if (debug_displaced
)
5960 fprintf_unfiltered (gdb_stdlog
, _("displaced: LDM: register "
5961 "r%d already in the right place\n"),
5964 clobbered
&= ~(1 << write_reg
);
5972 /* Restore any registers we scribbled over. */
5973 for (write_reg
= 0; clobbered
!= 0; write_reg
++)
5975 if ((clobbered
& (1 << write_reg
)) != 0)
5977 displaced_write_reg (regs
, dsc
, write_reg
, dsc
->tmp
[write_reg
],
5979 if (debug_displaced
)
5980 fprintf_unfiltered (gdb_stdlog
, _("displaced: LDM: restored "
5981 "clobbered register r%d\n"), write_reg
);
5982 clobbered
&= ~(1 << write_reg
);
5986 /* Perform register writeback manually. */
5987 if (dsc
->u
.block
.writeback
)
5989 ULONGEST new_rn_val
= dsc
->u
.block
.xfer_addr
;
5991 if (dsc
->u
.block
.increment
)
5992 new_rn_val
+= regs_loaded
* 4;
5994 new_rn_val
-= regs_loaded
* 4;
5996 displaced_write_reg (regs
, dsc
, dsc
->u
.block
.rn
, new_rn_val
,
6001 /* Handle ldm/stm, apart from some tricky cases which are unlikely to occur
6002 in user-level code (in particular exception return, ldm rn, {...pc}^). */
6005 arm_copy_block_xfer (struct gdbarch
*gdbarch
, uint32_t insn
,
6006 struct regcache
*regs
,
6007 arm_displaced_step_closure
*dsc
)
6009 int load
= bit (insn
, 20);
6010 int user
= bit (insn
, 22);
6011 int increment
= bit (insn
, 23);
6012 int before
= bit (insn
, 24);
6013 int writeback
= bit (insn
, 21);
6014 int rn
= bits (insn
, 16, 19);
6016 /* Block transfers which don't mention PC can be run directly
6018 if (rn
!= ARM_PC_REGNUM
&& (insn
& 0x8000) == 0)
6019 return arm_copy_unmodified (gdbarch
, insn
, "ldm/stm", dsc
);
6021 if (rn
== ARM_PC_REGNUM
)
6023 warning (_("displaced: Unpredictable LDM or STM with "
6024 "base register r15"));
6025 return arm_copy_unmodified (gdbarch
, insn
, "unpredictable ldm/stm", dsc
);
6028 if (debug_displaced
)
6029 fprintf_unfiltered (gdb_stdlog
, "displaced: copying block transfer insn "
6030 "%.8lx\n", (unsigned long) insn
);
6032 dsc
->u
.block
.xfer_addr
= displaced_read_reg (regs
, dsc
, rn
);
6033 dsc
->u
.block
.rn
= rn
;
6035 dsc
->u
.block
.load
= load
;
6036 dsc
->u
.block
.user
= user
;
6037 dsc
->u
.block
.increment
= increment
;
6038 dsc
->u
.block
.before
= before
;
6039 dsc
->u
.block
.writeback
= writeback
;
6040 dsc
->u
.block
.cond
= bits (insn
, 28, 31);
6042 dsc
->u
.block
.regmask
= insn
& 0xffff;
6046 if ((insn
& 0xffff) == 0xffff)
6048 /* LDM with a fully-populated register list. This case is
6049 particularly tricky. Implement for now by fully emulating the
6050 instruction (which might not behave perfectly in all cases, but
6051 these instructions should be rare enough for that not to matter
6053 dsc
->modinsn
[0] = ARM_NOP
;
6055 dsc
->cleanup
= &cleanup_block_load_all
;
6059 /* LDM of a list of registers which includes PC. Implement by
6060 rewriting the list of registers to be transferred into a
6061 contiguous chunk r0...rX before doing the transfer, then shuffling
6062 registers into the correct places in the cleanup routine. */
6063 unsigned int regmask
= insn
& 0xffff;
6064 unsigned int num_in_list
= bitcount (regmask
), new_regmask
;
6067 for (i
= 0; i
< num_in_list
; i
++)
6068 dsc
->tmp
[i
] = displaced_read_reg (regs
, dsc
, i
);
6070 /* Writeback makes things complicated. We need to avoid clobbering
6071 the base register with one of the registers in our modified
6072 register list, but just using a different register can't work in
6075 ldm r14!, {r0-r13,pc}
6077 which would need to be rewritten as:
6081 but that can't work, because there's no free register for N.
6083 Solve this by turning off the writeback bit, and emulating
6084 writeback manually in the cleanup routine. */
6089 new_regmask
= (1 << num_in_list
) - 1;
6091 if (debug_displaced
)
6092 fprintf_unfiltered (gdb_stdlog
, _("displaced: LDM r%d%s, "
6093 "{..., pc}: original reg list %.4x, modified "
6094 "list %.4x\n"), rn
, writeback
? "!" : "",
6095 (int) insn
& 0xffff, new_regmask
);
6097 dsc
->modinsn
[0] = (insn
& ~0xffff) | (new_regmask
& 0xffff);
6099 dsc
->cleanup
= &cleanup_block_load_pc
;
6104 /* STM of a list of registers which includes PC. Run the instruction
6105 as-is, but out of line: this will store the wrong value for the PC,
6106 so we must manually fix up the memory in the cleanup routine.
6107 Doing things this way has the advantage that we can auto-detect
6108 the offset of the PC write (which is architecture-dependent) in
6109 the cleanup routine. */
6110 dsc
->modinsn
[0] = insn
;
6112 dsc
->cleanup
= &cleanup_block_store_pc
;
6119 thumb2_copy_block_xfer (struct gdbarch
*gdbarch
, uint16_t insn1
, uint16_t insn2
,
6120 struct regcache
*regs
,
6121 arm_displaced_step_closure
*dsc
)
6123 int rn
= bits (insn1
, 0, 3);
6124 int load
= bit (insn1
, 4);
6125 int writeback
= bit (insn1
, 5);
6127 /* Block transfers which don't mention PC can be run directly
6129 if (rn
!= ARM_PC_REGNUM
&& (insn2
& 0x8000) == 0)
6130 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
, "ldm/stm", dsc
);
6132 if (rn
== ARM_PC_REGNUM
)
6134 warning (_("displaced: Unpredictable LDM or STM with "
6135 "base register r15"));
6136 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6137 "unpredictable ldm/stm", dsc
);
6140 if (debug_displaced
)
6141 fprintf_unfiltered (gdb_stdlog
, "displaced: copying block transfer insn "
6142 "%.4x%.4x\n", insn1
, insn2
);
6144 /* Clear bit 13, since it should be always zero. */
6145 dsc
->u
.block
.regmask
= (insn2
& 0xdfff);
6146 dsc
->u
.block
.rn
= rn
;
6148 dsc
->u
.block
.load
= load
;
6149 dsc
->u
.block
.user
= 0;
6150 dsc
->u
.block
.increment
= bit (insn1
, 7);
6151 dsc
->u
.block
.before
= bit (insn1
, 8);
6152 dsc
->u
.block
.writeback
= writeback
;
6153 dsc
->u
.block
.cond
= INST_AL
;
6154 dsc
->u
.block
.xfer_addr
= displaced_read_reg (regs
, dsc
, rn
);
6158 if (dsc
->u
.block
.regmask
== 0xffff)
6160 /* This branch is impossible to happen. */
6165 unsigned int regmask
= dsc
->u
.block
.regmask
;
6166 unsigned int num_in_list
= bitcount (regmask
), new_regmask
;
6169 for (i
= 0; i
< num_in_list
; i
++)
6170 dsc
->tmp
[i
] = displaced_read_reg (regs
, dsc
, i
);
6175 new_regmask
= (1 << num_in_list
) - 1;
6177 if (debug_displaced
)
6178 fprintf_unfiltered (gdb_stdlog
, _("displaced: LDM r%d%s, "
6179 "{..., pc}: original reg list %.4x, modified "
6180 "list %.4x\n"), rn
, writeback
? "!" : "",
6181 (int) dsc
->u
.block
.regmask
, new_regmask
);
6183 dsc
->modinsn
[0] = insn1
;
6184 dsc
->modinsn
[1] = (new_regmask
& 0xffff);
6187 dsc
->cleanup
= &cleanup_block_load_pc
;
6192 dsc
->modinsn
[0] = insn1
;
6193 dsc
->modinsn
[1] = insn2
;
6195 dsc
->cleanup
= &cleanup_block_store_pc
;
6200 /* Wrapper over read_memory_unsigned_integer for use in arm_get_next_pcs.
6201 This is used to avoid a dependency on BFD's bfd_endian enum. */
6204 arm_get_next_pcs_read_memory_unsigned_integer (CORE_ADDR memaddr
, int len
,
6207 return read_memory_unsigned_integer (memaddr
, len
,
6208 (enum bfd_endian
) byte_order
);
6211 /* Wrapper over gdbarch_addr_bits_remove for use in arm_get_next_pcs. */
6214 arm_get_next_pcs_addr_bits_remove (struct arm_get_next_pcs
*self
,
6217 return gdbarch_addr_bits_remove (self
->regcache
->arch (), val
);
6220 /* Wrapper over syscall_next_pc for use in get_next_pcs. */
6223 arm_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs
*self
)
6228 /* Wrapper over arm_is_thumb for use in arm_get_next_pcs. */
6231 arm_get_next_pcs_is_thumb (struct arm_get_next_pcs
*self
)
6233 return arm_is_thumb (self
->regcache
);
6236 /* single_step() is called just before we want to resume the inferior,
6237 if we want to single-step it but there is no hardware or kernel
6238 single-step support. We find the target of the coming instructions
6239 and breakpoint them. */
6241 std::vector
<CORE_ADDR
>
6242 arm_software_single_step (struct regcache
*regcache
)
6244 struct gdbarch
*gdbarch
= regcache
->arch ();
6245 struct arm_get_next_pcs next_pcs_ctx
;
6247 arm_get_next_pcs_ctor (&next_pcs_ctx
,
6248 &arm_get_next_pcs_ops
,
6249 gdbarch_byte_order (gdbarch
),
6250 gdbarch_byte_order_for_code (gdbarch
),
6254 std::vector
<CORE_ADDR
> next_pcs
= arm_get_next_pcs (&next_pcs_ctx
);
6256 for (CORE_ADDR
&pc_ref
: next_pcs
)
6257 pc_ref
= gdbarch_addr_bits_remove (gdbarch
, pc_ref
);
6262 /* Cleanup/copy SVC (SWI) instructions. These two functions are overridden
6263 for Linux, where some SVC instructions must be treated specially. */
6266 cleanup_svc (struct gdbarch
*gdbarch
, struct regcache
*regs
,
6267 arm_displaced_step_closure
*dsc
)
6269 CORE_ADDR resume_addr
= dsc
->insn_addr
+ dsc
->insn_size
;
6271 if (debug_displaced
)
6272 fprintf_unfiltered (gdb_stdlog
, "displaced: cleanup for svc, resume at "
6273 "%.8lx\n", (unsigned long) resume_addr
);
6275 displaced_write_reg (regs
, dsc
, ARM_PC_REGNUM
, resume_addr
, BRANCH_WRITE_PC
);
6279 /* Common copy routine for svc instruciton. */
6282 install_svc (struct gdbarch
*gdbarch
, struct regcache
*regs
,
6283 arm_displaced_step_closure
*dsc
)
6285 /* Preparation: none.
6286 Insn: unmodified svc.
6287 Cleanup: pc <- insn_addr + insn_size. */
6289 /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next
6291 dsc
->wrote_to_pc
= 1;
6293 /* Allow OS-specific code to override SVC handling. */
6294 if (dsc
->u
.svc
.copy_svc_os
)
6295 return dsc
->u
.svc
.copy_svc_os (gdbarch
, regs
, dsc
);
6298 dsc
->cleanup
= &cleanup_svc
;
6304 arm_copy_svc (struct gdbarch
*gdbarch
, uint32_t insn
,
6305 struct regcache
*regs
, arm_displaced_step_closure
*dsc
)
6308 if (debug_displaced
)
6309 fprintf_unfiltered (gdb_stdlog
, "displaced: copying svc insn %.8lx\n",
6310 (unsigned long) insn
);
6312 dsc
->modinsn
[0] = insn
;
6314 return install_svc (gdbarch
, regs
, dsc
);
6318 thumb_copy_svc (struct gdbarch
*gdbarch
, uint16_t insn
,
6319 struct regcache
*regs
, arm_displaced_step_closure
*dsc
)
6322 if (debug_displaced
)
6323 fprintf_unfiltered (gdb_stdlog
, "displaced: copying svc insn %.4x\n",
6326 dsc
->modinsn
[0] = insn
;
6328 return install_svc (gdbarch
, regs
, dsc
);
6331 /* Copy undefined instructions. */
6334 arm_copy_undef (struct gdbarch
*gdbarch
, uint32_t insn
,
6335 arm_displaced_step_closure
*dsc
)
6337 if (debug_displaced
)
6338 fprintf_unfiltered (gdb_stdlog
,
6339 "displaced: copying undefined insn %.8lx\n",
6340 (unsigned long) insn
);
6342 dsc
->modinsn
[0] = insn
;
6348 thumb_32bit_copy_undef (struct gdbarch
*gdbarch
, uint16_t insn1
, uint16_t insn2
,
6349 arm_displaced_step_closure
*dsc
)
6352 if (debug_displaced
)
6353 fprintf_unfiltered (gdb_stdlog
, "displaced: copying undefined insn "
6354 "%.4x %.4x\n", (unsigned short) insn1
,
6355 (unsigned short) insn2
);
6357 dsc
->modinsn
[0] = insn1
;
6358 dsc
->modinsn
[1] = insn2
;
6364 /* Copy unpredictable instructions. */
6367 arm_copy_unpred (struct gdbarch
*gdbarch
, uint32_t insn
,
6368 arm_displaced_step_closure
*dsc
)
6370 if (debug_displaced
)
6371 fprintf_unfiltered (gdb_stdlog
, "displaced: copying unpredictable insn "
6372 "%.8lx\n", (unsigned long) insn
);
6374 dsc
->modinsn
[0] = insn
;
6379 /* The decode_* functions are instruction decoding helpers. They mostly follow
6380 the presentation in the ARM ARM. */
6383 arm_decode_misc_memhint_neon (struct gdbarch
*gdbarch
, uint32_t insn
,
6384 struct regcache
*regs
,
6385 arm_displaced_step_closure
*dsc
)
6387 unsigned int op1
= bits (insn
, 20, 26), op2
= bits (insn
, 4, 7);
6388 unsigned int rn
= bits (insn
, 16, 19);
6390 if (op1
== 0x10 && (op2
& 0x2) == 0x0 && (rn
& 0x1) == 0x0)
6391 return arm_copy_unmodified (gdbarch
, insn
, "cps", dsc
);
6392 else if (op1
== 0x10 && op2
== 0x0 && (rn
& 0x1) == 0x1)
6393 return arm_copy_unmodified (gdbarch
, insn
, "setend", dsc
);
6394 else if ((op1
& 0x60) == 0x20)
6395 return arm_copy_unmodified (gdbarch
, insn
, "neon dataproc", dsc
);
6396 else if ((op1
& 0x71) == 0x40)
6397 return arm_copy_unmodified (gdbarch
, insn
, "neon elt/struct load/store",
6399 else if ((op1
& 0x77) == 0x41)
6400 return arm_copy_unmodified (gdbarch
, insn
, "unallocated mem hint", dsc
);
6401 else if ((op1
& 0x77) == 0x45)
6402 return arm_copy_preload (gdbarch
, insn
, regs
, dsc
); /* pli. */
6403 else if ((op1
& 0x77) == 0x51)
6406 return arm_copy_preload (gdbarch
, insn
, regs
, dsc
); /* pld/pldw. */
6408 return arm_copy_unpred (gdbarch
, insn
, dsc
);
6410 else if ((op1
& 0x77) == 0x55)
6411 return arm_copy_preload (gdbarch
, insn
, regs
, dsc
); /* pld/pldw. */
6412 else if (op1
== 0x57)
6415 case 0x1: return arm_copy_unmodified (gdbarch
, insn
, "clrex", dsc
);
6416 case 0x4: return arm_copy_unmodified (gdbarch
, insn
, "dsb", dsc
);
6417 case 0x5: return arm_copy_unmodified (gdbarch
, insn
, "dmb", dsc
);
6418 case 0x6: return arm_copy_unmodified (gdbarch
, insn
, "isb", dsc
);
6419 default: return arm_copy_unpred (gdbarch
, insn
, dsc
);
6421 else if ((op1
& 0x63) == 0x43)
6422 return arm_copy_unpred (gdbarch
, insn
, dsc
);
6423 else if ((op2
& 0x1) == 0x0)
6424 switch (op1
& ~0x80)
6427 return arm_copy_unmodified (gdbarch
, insn
, "unallocated mem hint", dsc
);
6429 return arm_copy_preload_reg (gdbarch
, insn
, regs
, dsc
); /* pli reg. */
6430 case 0x71: case 0x75:
6432 return arm_copy_preload_reg (gdbarch
, insn
, regs
, dsc
);
6433 case 0x63: case 0x67: case 0x73: case 0x77:
6434 return arm_copy_unpred (gdbarch
, insn
, dsc
);
6436 return arm_copy_undef (gdbarch
, insn
, dsc
);
6439 return arm_copy_undef (gdbarch
, insn
, dsc
); /* Probably unreachable. */
6443 arm_decode_unconditional (struct gdbarch
*gdbarch
, uint32_t insn
,
6444 struct regcache
*regs
,
6445 arm_displaced_step_closure
*dsc
)
6447 if (bit (insn
, 27) == 0)
6448 return arm_decode_misc_memhint_neon (gdbarch
, insn
, regs
, dsc
);
6449 /* Switch on bits: 0bxxxxx321xxx0xxxxxxxxxxxxxxxxxxxx. */
6450 else switch (((insn
& 0x7000000) >> 23) | ((insn
& 0x100000) >> 20))
6453 return arm_copy_unmodified (gdbarch
, insn
, "srs", dsc
);
6456 return arm_copy_unmodified (gdbarch
, insn
, "rfe", dsc
);
6458 case 0x4: case 0x5: case 0x6: case 0x7:
6459 return arm_copy_b_bl_blx (gdbarch
, insn
, regs
, dsc
);
6462 switch ((insn
& 0xe00000) >> 21)
6464 case 0x1: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7:
6466 return arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6469 return arm_copy_unmodified (gdbarch
, insn
, "mcrr/mcrr2", dsc
);
6472 return arm_copy_undef (gdbarch
, insn
, dsc
);
6477 int rn_f
= (bits (insn
, 16, 19) == 0xf);
6478 switch ((insn
& 0xe00000) >> 21)
6481 /* ldc/ldc2 imm (undefined for rn == pc). */
6482 return rn_f
? arm_copy_undef (gdbarch
, insn
, dsc
)
6483 : arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6486 return arm_copy_unmodified (gdbarch
, insn
, "mrrc/mrrc2", dsc
);
6488 case 0x4: case 0x5: case 0x6: case 0x7:
6489 /* ldc/ldc2 lit (undefined for rn != pc). */
6490 return rn_f
? arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
)
6491 : arm_copy_undef (gdbarch
, insn
, dsc
);
6494 return arm_copy_undef (gdbarch
, insn
, dsc
);
6499 return arm_copy_unmodified (gdbarch
, insn
, "stc/stc2", dsc
);
6502 if (bits (insn
, 16, 19) == 0xf)
6504 return arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6506 return arm_copy_undef (gdbarch
, insn
, dsc
);
6510 return arm_copy_unmodified (gdbarch
, insn
, "mcr/mcr2", dsc
);
6512 return arm_copy_unmodified (gdbarch
, insn
, "cdp/cdp2", dsc
);
6516 return arm_copy_unmodified (gdbarch
, insn
, "mrc/mrc2", dsc
);
6518 return arm_copy_unmodified (gdbarch
, insn
, "cdp/cdp2", dsc
);
6521 return arm_copy_undef (gdbarch
, insn
, dsc
);
6525 /* Decode miscellaneous instructions in dp/misc encoding space. */
6528 arm_decode_miscellaneous (struct gdbarch
*gdbarch
, uint32_t insn
,
6529 struct regcache
*regs
,
6530 arm_displaced_step_closure
*dsc
)
6532 unsigned int op2
= bits (insn
, 4, 6);
6533 unsigned int op
= bits (insn
, 21, 22);
6538 return arm_copy_unmodified (gdbarch
, insn
, "mrs/msr", dsc
);
6541 if (op
== 0x1) /* bx. */
6542 return arm_copy_bx_blx_reg (gdbarch
, insn
, regs
, dsc
);
6544 return arm_copy_unmodified (gdbarch
, insn
, "clz", dsc
);
6546 return arm_copy_undef (gdbarch
, insn
, dsc
);
6550 /* Not really supported. */
6551 return arm_copy_unmodified (gdbarch
, insn
, "bxj", dsc
);
6553 return arm_copy_undef (gdbarch
, insn
, dsc
);
6557 return arm_copy_bx_blx_reg (gdbarch
, insn
,
6558 regs
, dsc
); /* blx register. */
6560 return arm_copy_undef (gdbarch
, insn
, dsc
);
6563 return arm_copy_unmodified (gdbarch
, insn
, "saturating add/sub", dsc
);
6567 return arm_copy_unmodified (gdbarch
, insn
, "bkpt", dsc
);
6569 /* Not really supported. */
6570 return arm_copy_unmodified (gdbarch
, insn
, "smc", dsc
);
6573 return arm_copy_undef (gdbarch
, insn
, dsc
);
6578 arm_decode_dp_misc (struct gdbarch
*gdbarch
, uint32_t insn
,
6579 struct regcache
*regs
,
6580 arm_displaced_step_closure
*dsc
)
6583 switch (bits (insn
, 20, 24))
6586 return arm_copy_unmodified (gdbarch
, insn
, "movw", dsc
);
6589 return arm_copy_unmodified (gdbarch
, insn
, "movt", dsc
);
6591 case 0x12: case 0x16:
6592 return arm_copy_unmodified (gdbarch
, insn
, "msr imm", dsc
);
6595 return arm_copy_alu_imm (gdbarch
, insn
, regs
, dsc
);
6599 uint32_t op1
= bits (insn
, 20, 24), op2
= bits (insn
, 4, 7);
6601 if ((op1
& 0x19) != 0x10 && (op2
& 0x1) == 0x0)
6602 return arm_copy_alu_reg (gdbarch
, insn
, regs
, dsc
);
6603 else if ((op1
& 0x19) != 0x10 && (op2
& 0x9) == 0x1)
6604 return arm_copy_alu_shifted_reg (gdbarch
, insn
, regs
, dsc
);
6605 else if ((op1
& 0x19) == 0x10 && (op2
& 0x8) == 0x0)
6606 return arm_decode_miscellaneous (gdbarch
, insn
, regs
, dsc
);
6607 else if ((op1
& 0x19) == 0x10 && (op2
& 0x9) == 0x8)
6608 return arm_copy_unmodified (gdbarch
, insn
, "halfword mul/mla", dsc
);
6609 else if ((op1
& 0x10) == 0x00 && op2
== 0x9)
6610 return arm_copy_unmodified (gdbarch
, insn
, "mul/mla", dsc
);
6611 else if ((op1
& 0x10) == 0x10 && op2
== 0x9)
6612 return arm_copy_unmodified (gdbarch
, insn
, "synch", dsc
);
6613 else if (op2
== 0xb || (op2
& 0xd) == 0xd)
6614 /* 2nd arg means "unprivileged". */
6615 return arm_copy_extra_ld_st (gdbarch
, insn
, (op1
& 0x12) == 0x02, regs
,
6619 /* Should be unreachable. */
6624 arm_decode_ld_st_word_ubyte (struct gdbarch
*gdbarch
, uint32_t insn
,
6625 struct regcache
*regs
,
6626 arm_displaced_step_closure
*dsc
)
6628 int a
= bit (insn
, 25), b
= bit (insn
, 4);
6629 uint32_t op1
= bits (insn
, 20, 24);
6631 if ((!a
&& (op1
& 0x05) == 0x00 && (op1
& 0x17) != 0x02)
6632 || (a
&& (op1
& 0x05) == 0x00 && (op1
& 0x17) != 0x02 && !b
))
6633 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 0, 4, 0);
6634 else if ((!a
&& (op1
& 0x17) == 0x02)
6635 || (a
&& (op1
& 0x17) == 0x02 && !b
))
6636 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 0, 4, 1);
6637 else if ((!a
&& (op1
& 0x05) == 0x01 && (op1
& 0x17) != 0x03)
6638 || (a
&& (op1
& 0x05) == 0x01 && (op1
& 0x17) != 0x03 && !b
))
6639 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 1, 4, 0);
6640 else if ((!a
&& (op1
& 0x17) == 0x03)
6641 || (a
&& (op1
& 0x17) == 0x03 && !b
))
6642 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 1, 4, 1);
6643 else if ((!a
&& (op1
& 0x05) == 0x04 && (op1
& 0x17) != 0x06)
6644 || (a
&& (op1
& 0x05) == 0x04 && (op1
& 0x17) != 0x06 && !b
))
6645 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 0, 1, 0);
6646 else if ((!a
&& (op1
& 0x17) == 0x06)
6647 || (a
&& (op1
& 0x17) == 0x06 && !b
))
6648 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 0, 1, 1);
6649 else if ((!a
&& (op1
& 0x05) == 0x05 && (op1
& 0x17) != 0x07)
6650 || (a
&& (op1
& 0x05) == 0x05 && (op1
& 0x17) != 0x07 && !b
))
6651 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 1, 1, 0);
6652 else if ((!a
&& (op1
& 0x17) == 0x07)
6653 || (a
&& (op1
& 0x17) == 0x07 && !b
))
6654 return arm_copy_ldr_str_ldrb_strb (gdbarch
, insn
, regs
, dsc
, 1, 1, 1);
6656 /* Should be unreachable. */
6661 arm_decode_media (struct gdbarch
*gdbarch
, uint32_t insn
,
6662 arm_displaced_step_closure
*dsc
)
6664 switch (bits (insn
, 20, 24))
6666 case 0x00: case 0x01: case 0x02: case 0x03:
6667 return arm_copy_unmodified (gdbarch
, insn
, "parallel add/sub signed", dsc
);
6669 case 0x04: case 0x05: case 0x06: case 0x07:
6670 return arm_copy_unmodified (gdbarch
, insn
, "parallel add/sub unsigned", dsc
);
6672 case 0x08: case 0x09: case 0x0a: case 0x0b:
6673 case 0x0c: case 0x0d: case 0x0e: case 0x0f:
6674 return arm_copy_unmodified (gdbarch
, insn
,
6675 "decode/pack/unpack/saturate/reverse", dsc
);
6678 if (bits (insn
, 5, 7) == 0) /* op2. */
6680 if (bits (insn
, 12, 15) == 0xf)
6681 return arm_copy_unmodified (gdbarch
, insn
, "usad8", dsc
);
6683 return arm_copy_unmodified (gdbarch
, insn
, "usada8", dsc
);
6686 return arm_copy_undef (gdbarch
, insn
, dsc
);
6688 case 0x1a: case 0x1b:
6689 if (bits (insn
, 5, 6) == 0x2) /* op2[1:0]. */
6690 return arm_copy_unmodified (gdbarch
, insn
, "sbfx", dsc
);
6692 return arm_copy_undef (gdbarch
, insn
, dsc
);
6694 case 0x1c: case 0x1d:
6695 if (bits (insn
, 5, 6) == 0x0) /* op2[1:0]. */
6697 if (bits (insn
, 0, 3) == 0xf)
6698 return arm_copy_unmodified (gdbarch
, insn
, "bfc", dsc
);
6700 return arm_copy_unmodified (gdbarch
, insn
, "bfi", dsc
);
6703 return arm_copy_undef (gdbarch
, insn
, dsc
);
6705 case 0x1e: case 0x1f:
6706 if (bits (insn
, 5, 6) == 0x2) /* op2[1:0]. */
6707 return arm_copy_unmodified (gdbarch
, insn
, "ubfx", dsc
);
6709 return arm_copy_undef (gdbarch
, insn
, dsc
);
6712 /* Should be unreachable. */
6717 arm_decode_b_bl_ldmstm (struct gdbarch
*gdbarch
, uint32_t insn
,
6718 struct regcache
*regs
,
6719 arm_displaced_step_closure
*dsc
)
6722 return arm_copy_b_bl_blx (gdbarch
, insn
, regs
, dsc
);
6724 return arm_copy_block_xfer (gdbarch
, insn
, regs
, dsc
);
6728 arm_decode_ext_reg_ld_st (struct gdbarch
*gdbarch
, uint32_t insn
,
6729 struct regcache
*regs
,
6730 arm_displaced_step_closure
*dsc
)
6732 unsigned int opcode
= bits (insn
, 20, 24);
6736 case 0x04: case 0x05: /* VFP/Neon mrrc/mcrr. */
6737 return arm_copy_unmodified (gdbarch
, insn
, "vfp/neon mrrc/mcrr", dsc
);
6739 case 0x08: case 0x0a: case 0x0c: case 0x0e:
6740 case 0x12: case 0x16:
6741 return arm_copy_unmodified (gdbarch
, insn
, "vfp/neon vstm/vpush", dsc
);
6743 case 0x09: case 0x0b: case 0x0d: case 0x0f:
6744 case 0x13: case 0x17:
6745 return arm_copy_unmodified (gdbarch
, insn
, "vfp/neon vldm/vpop", dsc
);
6747 case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */
6748 case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */
6749 /* Note: no writeback for these instructions. Bit 25 will always be
6750 zero though (via caller), so the following works OK. */
6751 return arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6754 /* Should be unreachable. */
6758 /* Decode shifted register instructions. */
6761 thumb2_decode_dp_shift_reg (struct gdbarch
*gdbarch
, uint16_t insn1
,
6762 uint16_t insn2
, struct regcache
*regs
,
6763 arm_displaced_step_closure
*dsc
)
6765 /* PC is only allowed to be used in instruction MOV. */
6767 unsigned int op
= bits (insn1
, 5, 8);
6768 unsigned int rn
= bits (insn1
, 0, 3);
6770 if (op
== 0x2 && rn
== 0xf) /* MOV */
6771 return thumb2_copy_alu_imm (gdbarch
, insn1
, insn2
, regs
, dsc
);
6773 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6774 "dp (shift reg)", dsc
);
6778 /* Decode extension register load/store. Exactly the same as
6779 arm_decode_ext_reg_ld_st. */
6782 thumb2_decode_ext_reg_ld_st (struct gdbarch
*gdbarch
, uint16_t insn1
,
6783 uint16_t insn2
, struct regcache
*regs
,
6784 arm_displaced_step_closure
*dsc
)
6786 unsigned int opcode
= bits (insn1
, 4, 8);
6790 case 0x04: case 0x05:
6791 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6792 "vfp/neon vmov", dsc
);
6794 case 0x08: case 0x0c: /* 01x00 */
6795 case 0x0a: case 0x0e: /* 01x10 */
6796 case 0x12: case 0x16: /* 10x10 */
6797 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6798 "vfp/neon vstm/vpush", dsc
);
6800 case 0x09: case 0x0d: /* 01x01 */
6801 case 0x0b: case 0x0f: /* 01x11 */
6802 case 0x13: case 0x17: /* 10x11 */
6803 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6804 "vfp/neon vldm/vpop", dsc
);
6806 case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */
6807 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6809 case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */
6810 return thumb2_copy_copro_load_store (gdbarch
, insn1
, insn2
, regs
, dsc
);
6813 /* Should be unreachable. */
6818 arm_decode_svc_copro (struct gdbarch
*gdbarch
, uint32_t insn
,
6819 struct regcache
*regs
, arm_displaced_step_closure
*dsc
)
6821 unsigned int op1
= bits (insn
, 20, 25);
6822 int op
= bit (insn
, 4);
6823 unsigned int coproc
= bits (insn
, 8, 11);
6825 if ((op1
& 0x20) == 0x00 && (op1
& 0x3a) != 0x00 && (coproc
& 0xe) == 0xa)
6826 return arm_decode_ext_reg_ld_st (gdbarch
, insn
, regs
, dsc
);
6827 else if ((op1
& 0x21) == 0x00 && (op1
& 0x3a) != 0x00
6828 && (coproc
& 0xe) != 0xa)
6830 return arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6831 else if ((op1
& 0x21) == 0x01 && (op1
& 0x3a) != 0x00
6832 && (coproc
& 0xe) != 0xa)
6833 /* ldc/ldc2 imm/lit. */
6834 return arm_copy_copro_load_store (gdbarch
, insn
, regs
, dsc
);
6835 else if ((op1
& 0x3e) == 0x00)
6836 return arm_copy_undef (gdbarch
, insn
, dsc
);
6837 else if ((op1
& 0x3e) == 0x04 && (coproc
& 0xe) == 0xa)
6838 return arm_copy_unmodified (gdbarch
, insn
, "neon 64bit xfer", dsc
);
6839 else if (op1
== 0x04 && (coproc
& 0xe) != 0xa)
6840 return arm_copy_unmodified (gdbarch
, insn
, "mcrr/mcrr2", dsc
);
6841 else if (op1
== 0x05 && (coproc
& 0xe) != 0xa)
6842 return arm_copy_unmodified (gdbarch
, insn
, "mrrc/mrrc2", dsc
);
6843 else if ((op1
& 0x30) == 0x20 && !op
)
6845 if ((coproc
& 0xe) == 0xa)
6846 return arm_copy_unmodified (gdbarch
, insn
, "vfp dataproc", dsc
);
6848 return arm_copy_unmodified (gdbarch
, insn
, "cdp/cdp2", dsc
);
6850 else if ((op1
& 0x30) == 0x20 && op
)
6851 return arm_copy_unmodified (gdbarch
, insn
, "neon 8/16/32 bit xfer", dsc
);
6852 else if ((op1
& 0x31) == 0x20 && op
&& (coproc
& 0xe) != 0xa)
6853 return arm_copy_unmodified (gdbarch
, insn
, "mcr/mcr2", dsc
);
6854 else if ((op1
& 0x31) == 0x21 && op
&& (coproc
& 0xe) != 0xa)
6855 return arm_copy_unmodified (gdbarch
, insn
, "mrc/mrc2", dsc
);
6856 else if ((op1
& 0x30) == 0x30)
6857 return arm_copy_svc (gdbarch
, insn
, regs
, dsc
);
6859 return arm_copy_undef (gdbarch
, insn
, dsc
); /* Possibly unreachable. */
6863 thumb2_decode_svc_copro (struct gdbarch
*gdbarch
, uint16_t insn1
,
6864 uint16_t insn2
, struct regcache
*regs
,
6865 arm_displaced_step_closure
*dsc
)
6867 unsigned int coproc
= bits (insn2
, 8, 11);
6868 unsigned int bit_5_8
= bits (insn1
, 5, 8);
6869 unsigned int bit_9
= bit (insn1
, 9);
6870 unsigned int bit_4
= bit (insn1
, 4);
6875 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6876 "neon 64bit xfer/mrrc/mrrc2/mcrr/mcrr2",
6878 else if (bit_5_8
== 0) /* UNDEFINED. */
6879 return thumb_32bit_copy_undef (gdbarch
, insn1
, insn2
, dsc
);
6882 /*coproc is 101x. SIMD/VFP, ext registers load/store. */
6883 if ((coproc
& 0xe) == 0xa)
6884 return thumb2_decode_ext_reg_ld_st (gdbarch
, insn1
, insn2
, regs
,
6886 else /* coproc is not 101x. */
6888 if (bit_4
== 0) /* STC/STC2. */
6889 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
6891 else /* LDC/LDC2 {literal, immeidate}. */
6892 return thumb2_copy_copro_load_store (gdbarch
, insn1
, insn2
,
6898 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
, "coproc", dsc
);
6904 install_pc_relative (struct gdbarch
*gdbarch
, struct regcache
*regs
,
6905 arm_displaced_step_closure
*dsc
, int rd
)
6911 Preparation: Rd <- PC
6917 int val
= displaced_read_reg (regs
, dsc
, ARM_PC_REGNUM
);
6918 displaced_write_reg (regs
, dsc
, rd
, val
, CANNOT_WRITE_PC
);
6922 thumb_copy_pc_relative_16bit (struct gdbarch
*gdbarch
, struct regcache
*regs
,
6923 arm_displaced_step_closure
*dsc
,
6924 int rd
, unsigned int imm
)
6927 /* Encoding T2: ADDS Rd, #imm */
6928 dsc
->modinsn
[0] = (0x3000 | (rd
<< 8) | imm
);
6930 install_pc_relative (gdbarch
, regs
, dsc
, rd
);
6936 thumb_decode_pc_relative_16bit (struct gdbarch
*gdbarch
, uint16_t insn
,
6937 struct regcache
*regs
,
6938 arm_displaced_step_closure
*dsc
)
6940 unsigned int rd
= bits (insn
, 8, 10);
6941 unsigned int imm8
= bits (insn
, 0, 7);
6943 if (debug_displaced
)
6944 fprintf_unfiltered (gdb_stdlog
,
6945 "displaced: copying thumb adr r%d, #%d insn %.4x\n",
6948 return thumb_copy_pc_relative_16bit (gdbarch
, regs
, dsc
, rd
, imm8
);
6952 thumb_copy_pc_relative_32bit (struct gdbarch
*gdbarch
, uint16_t insn1
,
6953 uint16_t insn2
, struct regcache
*regs
,
6954 arm_displaced_step_closure
*dsc
)
6956 unsigned int rd
= bits (insn2
, 8, 11);
6957 /* Since immediate has the same encoding in ADR ADD and SUB, so we simply
6958 extract raw immediate encoding rather than computing immediate. When
6959 generating ADD or SUB instruction, we can simply perform OR operation to
6960 set immediate into ADD. */
6961 unsigned int imm_3_8
= insn2
& 0x70ff;
6962 unsigned int imm_i
= insn1
& 0x0400; /* Clear all bits except bit 10. */
6964 if (debug_displaced
)
6965 fprintf_unfiltered (gdb_stdlog
,
6966 "displaced: copying thumb adr r%d, #%d:%d insn %.4x%.4x\n",
6967 rd
, imm_i
, imm_3_8
, insn1
, insn2
);
6969 if (bit (insn1
, 7)) /* Encoding T2 */
6971 /* Encoding T3: SUB Rd, Rd, #imm */
6972 dsc
->modinsn
[0] = (0xf1a0 | rd
| imm_i
);
6973 dsc
->modinsn
[1] = ((rd
<< 8) | imm_3_8
);
6975 else /* Encoding T3 */
6977 /* Encoding T3: ADD Rd, Rd, #imm */
6978 dsc
->modinsn
[0] = (0xf100 | rd
| imm_i
);
6979 dsc
->modinsn
[1] = ((rd
<< 8) | imm_3_8
);
6983 install_pc_relative (gdbarch
, regs
, dsc
, rd
);
6989 thumb_copy_16bit_ldr_literal (struct gdbarch
*gdbarch
, uint16_t insn1
,
6990 struct regcache
*regs
,
6991 arm_displaced_step_closure
*dsc
)
6993 unsigned int rt
= bits (insn1
, 8, 10);
6995 int imm8
= (bits (insn1
, 0, 7) << 2);
7001 Preparation: tmp0 <- R0, tmp2 <- R2, tmp3 <- R3, R2 <- PC, R3 <- #imm8;
7003 Insn: LDR R0, [R2, R3];
7004 Cleanup: R2 <- tmp2, R3 <- tmp3, Rd <- R0, R0 <- tmp0 */
7006 if (debug_displaced
)
7007 fprintf_unfiltered (gdb_stdlog
,
7008 "displaced: copying thumb ldr r%d [pc #%d]\n"
7011 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 0);
7012 dsc
->tmp
[2] = displaced_read_reg (regs
, dsc
, 2);
7013 dsc
->tmp
[3] = displaced_read_reg (regs
, dsc
, 3);
7014 pc
= displaced_read_reg (regs
, dsc
, ARM_PC_REGNUM
);
7015 /* The assembler calculates the required value of the offset from the
7016 Align(PC,4) value of this instruction to the label. */
7017 pc
= pc
& 0xfffffffc;
7019 displaced_write_reg (regs
, dsc
, 2, pc
, CANNOT_WRITE_PC
);
7020 displaced_write_reg (regs
, dsc
, 3, imm8
, CANNOT_WRITE_PC
);
7023 dsc
->u
.ldst
.xfersize
= 4;
7025 dsc
->u
.ldst
.immed
= 0;
7026 dsc
->u
.ldst
.writeback
= 0;
7027 dsc
->u
.ldst
.restore_r4
= 0;
7029 dsc
->modinsn
[0] = 0x58d0; /* ldr r0, [r2, r3]*/
7031 dsc
->cleanup
= &cleanup_load
;
7036 /* Copy Thumb cbnz/cbz insruction. */
7039 thumb_copy_cbnz_cbz (struct gdbarch
*gdbarch
, uint16_t insn1
,
7040 struct regcache
*regs
,
7041 arm_displaced_step_closure
*dsc
)
7043 int non_zero
= bit (insn1
, 11);
7044 unsigned int imm5
= (bit (insn1
, 9) << 6) | (bits (insn1
, 3, 7) << 1);
7045 CORE_ADDR from
= dsc
->insn_addr
;
7046 int rn
= bits (insn1
, 0, 2);
7047 int rn_val
= displaced_read_reg (regs
, dsc
, rn
);
7049 dsc
->u
.branch
.cond
= (rn_val
&& non_zero
) || (!rn_val
&& !non_zero
);
7050 /* CBNZ and CBZ do not affect the condition flags. If condition is true,
7051 set it INST_AL, so cleanup_branch will know branch is taken, otherwise,
7052 condition is false, let it be, cleanup_branch will do nothing. */
7053 if (dsc
->u
.branch
.cond
)
7055 dsc
->u
.branch
.cond
= INST_AL
;
7056 dsc
->u
.branch
.dest
= from
+ 4 + imm5
;
7059 dsc
->u
.branch
.dest
= from
+ 2;
7061 dsc
->u
.branch
.link
= 0;
7062 dsc
->u
.branch
.exchange
= 0;
7064 if (debug_displaced
)
7065 fprintf_unfiltered (gdb_stdlog
, "displaced: copying %s [r%d = 0x%x]"
7066 " insn %.4x to %.8lx\n", non_zero
? "cbnz" : "cbz",
7067 rn
, rn_val
, insn1
, dsc
->u
.branch
.dest
);
7069 dsc
->modinsn
[0] = THUMB_NOP
;
7071 dsc
->cleanup
= &cleanup_branch
;
7075 /* Copy Table Branch Byte/Halfword */
7077 thumb2_copy_table_branch (struct gdbarch
*gdbarch
, uint16_t insn1
,
7078 uint16_t insn2
, struct regcache
*regs
,
7079 arm_displaced_step_closure
*dsc
)
7081 ULONGEST rn_val
, rm_val
;
7082 int is_tbh
= bit (insn2
, 4);
7083 CORE_ADDR halfwords
= 0;
7084 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
7086 rn_val
= displaced_read_reg (regs
, dsc
, bits (insn1
, 0, 3));
7087 rm_val
= displaced_read_reg (regs
, dsc
, bits (insn2
, 0, 3));
7093 target_read_memory (rn_val
+ 2 * rm_val
, buf
, 2);
7094 halfwords
= extract_unsigned_integer (buf
, 2, byte_order
);
7100 target_read_memory (rn_val
+ rm_val
, buf
, 1);
7101 halfwords
= extract_unsigned_integer (buf
, 1, byte_order
);
7104 if (debug_displaced
)
7105 fprintf_unfiltered (gdb_stdlog
, "displaced: %s base 0x%x offset 0x%x"
7106 " offset 0x%x\n", is_tbh
? "tbh" : "tbb",
7107 (unsigned int) rn_val
, (unsigned int) rm_val
,
7108 (unsigned int) halfwords
);
7110 dsc
->u
.branch
.cond
= INST_AL
;
7111 dsc
->u
.branch
.link
= 0;
7112 dsc
->u
.branch
.exchange
= 0;
7113 dsc
->u
.branch
.dest
= dsc
->insn_addr
+ 4 + 2 * halfwords
;
7115 dsc
->cleanup
= &cleanup_branch
;
7121 cleanup_pop_pc_16bit_all (struct gdbarch
*gdbarch
, struct regcache
*regs
,
7122 arm_displaced_step_closure
*dsc
)
7125 int val
= displaced_read_reg (regs
, dsc
, 7);
7126 displaced_write_reg (regs
, dsc
, ARM_PC_REGNUM
, val
, BX_WRITE_PC
);
7129 val
= displaced_read_reg (regs
, dsc
, 8);
7130 displaced_write_reg (regs
, dsc
, 7, val
, CANNOT_WRITE_PC
);
7133 displaced_write_reg (regs
, dsc
, 8, dsc
->tmp
[0], CANNOT_WRITE_PC
);
7138 thumb_copy_pop_pc_16bit (struct gdbarch
*gdbarch
, uint16_t insn1
,
7139 struct regcache
*regs
,
7140 arm_displaced_step_closure
*dsc
)
7142 dsc
->u
.block
.regmask
= insn1
& 0x00ff;
7144 /* Rewrite instruction: POP {rX, rY, ...,rZ, PC}
7147 (1) register list is full, that is, r0-r7 are used.
7148 Prepare: tmp[0] <- r8
7150 POP {r0, r1, ...., r6, r7}; remove PC from reglist
7151 MOV r8, r7; Move value of r7 to r8;
7152 POP {r7}; Store PC value into r7.
7154 Cleanup: PC <- r7, r7 <- r8, r8 <-tmp[0]
7156 (2) register list is not full, supposing there are N registers in
7157 register list (except PC, 0 <= N <= 7).
7158 Prepare: for each i, 0 - N, tmp[i] <- ri.
7160 POP {r0, r1, ...., rN};
7162 Cleanup: Set registers in original reglist from r0 - rN. Restore r0 - rN
7163 from tmp[] properly.
7165 if (debug_displaced
)
7166 fprintf_unfiltered (gdb_stdlog
,
7167 "displaced: copying thumb pop {%.8x, pc} insn %.4x\n",
7168 dsc
->u
.block
.regmask
, insn1
);
7170 if (dsc
->u
.block
.regmask
== 0xff)
7172 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, 8);
7174 dsc
->modinsn
[0] = (insn1
& 0xfeff); /* POP {r0,r1,...,r6, r7} */
7175 dsc
->modinsn
[1] = 0x46b8; /* MOV r8, r7 */
7176 dsc
->modinsn
[2] = 0xbc80; /* POP {r7} */
7179 dsc
->cleanup
= &cleanup_pop_pc_16bit_all
;
7183 unsigned int num_in_list
= bitcount (dsc
->u
.block
.regmask
);
7185 unsigned int new_regmask
;
7187 for (i
= 0; i
< num_in_list
+ 1; i
++)
7188 dsc
->tmp
[i
] = displaced_read_reg (regs
, dsc
, i
);
7190 new_regmask
= (1 << (num_in_list
+ 1)) - 1;
7192 if (debug_displaced
)
7193 fprintf_unfiltered (gdb_stdlog
, _("displaced: POP "
7194 "{..., pc}: original reg list %.4x,"
7195 " modified list %.4x\n"),
7196 (int) dsc
->u
.block
.regmask
, new_regmask
);
7198 dsc
->u
.block
.regmask
|= 0x8000;
7199 dsc
->u
.block
.writeback
= 0;
7200 dsc
->u
.block
.cond
= INST_AL
;
7202 dsc
->modinsn
[0] = (insn1
& ~0x1ff) | (new_regmask
& 0xff);
7204 dsc
->cleanup
= &cleanup_block_load_pc
;
7211 thumb_process_displaced_16bit_insn (struct gdbarch
*gdbarch
, uint16_t insn1
,
7212 struct regcache
*regs
,
7213 arm_displaced_step_closure
*dsc
)
7215 unsigned short op_bit_12_15
= bits (insn1
, 12, 15);
7216 unsigned short op_bit_10_11
= bits (insn1
, 10, 11);
7219 /* 16-bit thumb instructions. */
7220 switch (op_bit_12_15
)
7222 /* Shift (imme), add, subtract, move and compare. */
7223 case 0: case 1: case 2: case 3:
7224 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
,
7225 "shift/add/sub/mov/cmp",
7229 switch (op_bit_10_11
)
7231 case 0: /* Data-processing */
7232 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
,
7236 case 1: /* Special data instructions and branch and exchange. */
7238 unsigned short op
= bits (insn1
, 7, 9);
7239 if (op
== 6 || op
== 7) /* BX or BLX */
7240 err
= thumb_copy_bx_blx_reg (gdbarch
, insn1
, regs
, dsc
);
7241 else if (bits (insn1
, 6, 7) != 0) /* ADD/MOV/CMP high registers. */
7242 err
= thumb_copy_alu_reg (gdbarch
, insn1
, regs
, dsc
);
7244 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "special data",
7248 default: /* LDR (literal) */
7249 err
= thumb_copy_16bit_ldr_literal (gdbarch
, insn1
, regs
, dsc
);
7252 case 5: case 6: case 7: case 8: case 9: /* Load/Store single data item */
7253 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "ldr/str", dsc
);
7256 if (op_bit_10_11
< 2) /* Generate PC-relative address */
7257 err
= thumb_decode_pc_relative_16bit (gdbarch
, insn1
, regs
, dsc
);
7258 else /* Generate SP-relative address */
7259 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "sp-relative", dsc
);
7261 case 11: /* Misc 16-bit instructions */
7263 switch (bits (insn1
, 8, 11))
7265 case 1: case 3: case 9: case 11: /* CBNZ, CBZ */
7266 err
= thumb_copy_cbnz_cbz (gdbarch
, insn1
, regs
, dsc
);
7268 case 12: case 13: /* POP */
7269 if (bit (insn1
, 8)) /* PC is in register list. */
7270 err
= thumb_copy_pop_pc_16bit (gdbarch
, insn1
, regs
, dsc
);
7272 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "pop", dsc
);
7274 case 15: /* If-Then, and hints */
7275 if (bits (insn1
, 0, 3))
7276 /* If-Then makes up to four following instructions conditional.
7277 IT instruction itself is not conditional, so handle it as a
7278 common unmodified instruction. */
7279 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "If-Then",
7282 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "hints", dsc
);
7285 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "misc", dsc
);
7290 if (op_bit_10_11
< 2) /* Store multiple registers */
7291 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "stm", dsc
);
7292 else /* Load multiple registers */
7293 err
= thumb_copy_unmodified_16bit (gdbarch
, insn1
, "ldm", dsc
);
7295 case 13: /* Conditional branch and supervisor call */
7296 if (bits (insn1
, 9, 11) != 7) /* conditional branch */
7297 err
= thumb_copy_b (gdbarch
, insn1
, dsc
);
7299 err
= thumb_copy_svc (gdbarch
, insn1
, regs
, dsc
);
7301 case 14: /* Unconditional branch */
7302 err
= thumb_copy_b (gdbarch
, insn1
, dsc
);
7309 internal_error (__FILE__
, __LINE__
,
7310 _("thumb_process_displaced_16bit_insn: Instruction decode error"));
7314 decode_thumb_32bit_ld_mem_hints (struct gdbarch
*gdbarch
,
7315 uint16_t insn1
, uint16_t insn2
,
7316 struct regcache
*regs
,
7317 arm_displaced_step_closure
*dsc
)
7319 int rt
= bits (insn2
, 12, 15);
7320 int rn
= bits (insn1
, 0, 3);
7321 int op1
= bits (insn1
, 7, 8);
7323 switch (bits (insn1
, 5, 6))
7325 case 0: /* Load byte and memory hints */
7326 if (rt
== 0xf) /* PLD/PLI */
7329 /* PLD literal or Encoding T3 of PLI(immediate, literal). */
7330 return thumb2_copy_preload (gdbarch
, insn1
, insn2
, regs
, dsc
);
7332 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7337 if (rn
== 0xf) /* LDRB/LDRSB (literal) */
7338 return thumb2_copy_load_literal (gdbarch
, insn1
, insn2
, regs
, dsc
,
7341 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7342 "ldrb{reg, immediate}/ldrbt",
7347 case 1: /* Load halfword and memory hints. */
7348 if (rt
== 0xf) /* PLD{W} and Unalloc memory hint. */
7349 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7350 "pld/unalloc memhint", dsc
);
7354 return thumb2_copy_load_literal (gdbarch
, insn1
, insn2
, regs
, dsc
,
7357 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7361 case 2: /* Load word */
7363 int insn2_bit_8_11
= bits (insn2
, 8, 11);
7366 return thumb2_copy_load_literal (gdbarch
, insn1
, insn2
, regs
, dsc
, 4);
7367 else if (op1
== 0x1) /* Encoding T3 */
7368 return thumb2_copy_load_reg_imm (gdbarch
, insn1
, insn2
, regs
, dsc
,
7370 else /* op1 == 0x0 */
7372 if (insn2_bit_8_11
== 0xc || (insn2_bit_8_11
& 0x9) == 0x9)
7373 /* LDR (immediate) */
7374 return thumb2_copy_load_reg_imm (gdbarch
, insn1
, insn2
, regs
,
7375 dsc
, bit (insn2
, 8), 1);
7376 else if (insn2_bit_8_11
== 0xe) /* LDRT */
7377 return thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7380 /* LDR (register) */
7381 return thumb2_copy_load_reg_imm (gdbarch
, insn1
, insn2
, regs
,
7387 return thumb_32bit_copy_undef (gdbarch
, insn1
, insn2
, dsc
);
7394 thumb_process_displaced_32bit_insn (struct gdbarch
*gdbarch
, uint16_t insn1
,
7395 uint16_t insn2
, struct regcache
*regs
,
7396 arm_displaced_step_closure
*dsc
)
7399 unsigned short op
= bit (insn2
, 15);
7400 unsigned int op1
= bits (insn1
, 11, 12);
7406 switch (bits (insn1
, 9, 10))
7411 /* Load/store {dual, execlusive}, table branch. */
7412 if (bits (insn1
, 7, 8) == 1 && bits (insn1
, 4, 5) == 1
7413 && bits (insn2
, 5, 7) == 0)
7414 err
= thumb2_copy_table_branch (gdbarch
, insn1
, insn2
, regs
,
7417 /* PC is not allowed to use in load/store {dual, exclusive}
7419 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7420 "load/store dual/ex", dsc
);
7422 else /* load/store multiple */
7424 switch (bits (insn1
, 7, 8))
7426 case 0: case 3: /* SRS, RFE */
7427 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7430 case 1: case 2: /* LDM/STM/PUSH/POP */
7431 err
= thumb2_copy_block_xfer (gdbarch
, insn1
, insn2
, regs
, dsc
);
7438 /* Data-processing (shift register). */
7439 err
= thumb2_decode_dp_shift_reg (gdbarch
, insn1
, insn2
, regs
,
7442 default: /* Coprocessor instructions. */
7443 err
= thumb2_decode_svc_copro (gdbarch
, insn1
, insn2
, regs
, dsc
);
7448 case 2: /* op1 = 2 */
7449 if (op
) /* Branch and misc control. */
7451 if (bit (insn2
, 14) /* BLX/BL */
7452 || bit (insn2
, 12) /* Unconditional branch */
7453 || (bits (insn1
, 7, 9) != 0x7)) /* Conditional branch */
7454 err
= thumb2_copy_b_bl_blx (gdbarch
, insn1
, insn2
, regs
, dsc
);
7456 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7461 if (bit (insn1
, 9)) /* Data processing (plain binary imm). */
7463 int op
= bits (insn1
, 4, 8);
7464 int rn
= bits (insn1
, 0, 3);
7465 if ((op
== 0 || op
== 0xa) && rn
== 0xf)
7466 err
= thumb_copy_pc_relative_32bit (gdbarch
, insn1
, insn2
,
7469 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7472 else /* Data processing (modified immeidate) */
7473 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7477 case 3: /* op1 = 3 */
7478 switch (bits (insn1
, 9, 10))
7482 err
= decode_thumb_32bit_ld_mem_hints (gdbarch
, insn1
, insn2
,
7484 else /* NEON Load/Store and Store single data item */
7485 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7486 "neon elt/struct load/store",
7489 case 1: /* op1 = 3, bits (9, 10) == 1 */
7490 switch (bits (insn1
, 7, 8))
7492 case 0: case 1: /* Data processing (register) */
7493 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7496 case 2: /* Multiply and absolute difference */
7497 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7498 "mul/mua/diff", dsc
);
7500 case 3: /* Long multiply and divide */
7501 err
= thumb_copy_unmodified_32bit (gdbarch
, insn1
, insn2
,
7506 default: /* Coprocessor instructions */
7507 err
= thumb2_decode_svc_copro (gdbarch
, insn1
, insn2
, regs
, dsc
);
7516 internal_error (__FILE__
, __LINE__
,
7517 _("thumb_process_displaced_32bit_insn: Instruction decode error"));
7522 thumb_process_displaced_insn (struct gdbarch
*gdbarch
, CORE_ADDR from
,
7523 struct regcache
*regs
,
7524 arm_displaced_step_closure
*dsc
)
7526 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
7528 = read_memory_unsigned_integer (from
, 2, byte_order_for_code
);
7530 if (debug_displaced
)
7531 fprintf_unfiltered (gdb_stdlog
, "displaced: process thumb insn %.4x "
7532 "at %.8lx\n", insn1
, (unsigned long) from
);
7535 dsc
->insn_size
= thumb_insn_size (insn1
);
7536 if (thumb_insn_size (insn1
) == 4)
7539 = read_memory_unsigned_integer (from
+ 2, 2, byte_order_for_code
);
7540 thumb_process_displaced_32bit_insn (gdbarch
, insn1
, insn2
, regs
, dsc
);
7543 thumb_process_displaced_16bit_insn (gdbarch
, insn1
, regs
, dsc
);
7547 arm_process_displaced_insn (struct gdbarch
*gdbarch
, CORE_ADDR from
,
7548 CORE_ADDR to
, struct regcache
*regs
,
7549 arm_displaced_step_closure
*dsc
)
7552 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
7555 /* Most displaced instructions use a 1-instruction scratch space, so set this
7556 here and override below if/when necessary. */
7558 dsc
->insn_addr
= from
;
7559 dsc
->scratch_base
= to
;
7560 dsc
->cleanup
= NULL
;
7561 dsc
->wrote_to_pc
= 0;
7563 if (!displaced_in_arm_mode (regs
))
7564 return thumb_process_displaced_insn (gdbarch
, from
, regs
, dsc
);
7568 insn
= read_memory_unsigned_integer (from
, 4, byte_order_for_code
);
7569 if (debug_displaced
)
7570 fprintf_unfiltered (gdb_stdlog
, "displaced: stepping insn %.8lx "
7571 "at %.8lx\n", (unsigned long) insn
,
7572 (unsigned long) from
);
7574 if ((insn
& 0xf0000000) == 0xf0000000)
7575 err
= arm_decode_unconditional (gdbarch
, insn
, regs
, dsc
);
7576 else switch (((insn
& 0x10) >> 4) | ((insn
& 0xe000000) >> 24))
7578 case 0x0: case 0x1: case 0x2: case 0x3:
7579 err
= arm_decode_dp_misc (gdbarch
, insn
, regs
, dsc
);
7582 case 0x4: case 0x5: case 0x6:
7583 err
= arm_decode_ld_st_word_ubyte (gdbarch
, insn
, regs
, dsc
);
7587 err
= arm_decode_media (gdbarch
, insn
, dsc
);
7590 case 0x8: case 0x9: case 0xa: case 0xb:
7591 err
= arm_decode_b_bl_ldmstm (gdbarch
, insn
, regs
, dsc
);
7594 case 0xc: case 0xd: case 0xe: case 0xf:
7595 err
= arm_decode_svc_copro (gdbarch
, insn
, regs
, dsc
);
7600 internal_error (__FILE__
, __LINE__
,
7601 _("arm_process_displaced_insn: Instruction decode error"));
7604 /* Actually set up the scratch space for a displaced instruction. */
7607 arm_displaced_init_closure (struct gdbarch
*gdbarch
, CORE_ADDR from
,
7608 CORE_ADDR to
, arm_displaced_step_closure
*dsc
)
7610 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
7611 unsigned int i
, len
, offset
;
7612 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
7613 int size
= dsc
->is_thumb
? 2 : 4;
7614 const gdb_byte
*bkp_insn
;
7617 /* Poke modified instruction(s). */
7618 for (i
= 0; i
< dsc
->numinsns
; i
++)
7620 if (debug_displaced
)
7622 fprintf_unfiltered (gdb_stdlog
, "displaced: writing insn ");
7624 fprintf_unfiltered (gdb_stdlog
, "%.8lx",
7627 fprintf_unfiltered (gdb_stdlog
, "%.4x",
7628 (unsigned short)dsc
->modinsn
[i
]);
7630 fprintf_unfiltered (gdb_stdlog
, " at %.8lx\n",
7631 (unsigned long) to
+ offset
);
7634 write_memory_unsigned_integer (to
+ offset
, size
,
7635 byte_order_for_code
,
7640 /* Choose the correct breakpoint instruction. */
7643 bkp_insn
= tdep
->thumb_breakpoint
;
7644 len
= tdep
->thumb_breakpoint_size
;
7648 bkp_insn
= tdep
->arm_breakpoint
;
7649 len
= tdep
->arm_breakpoint_size
;
7652 /* Put breakpoint afterwards. */
7653 write_memory (to
+ offset
, bkp_insn
, len
);
7655 if (debug_displaced
)
7656 fprintf_unfiltered (gdb_stdlog
, "displaced: copy %s->%s: ",
7657 paddress (gdbarch
, from
), paddress (gdbarch
, to
));
7660 /* Entry point for cleaning things up after a displaced instruction has been
7664 arm_displaced_step_fixup (struct gdbarch
*gdbarch
,
7665 struct displaced_step_closure
*dsc_
,
7666 CORE_ADDR from
, CORE_ADDR to
,
7667 struct regcache
*regs
)
7669 arm_displaced_step_closure
*dsc
= (arm_displaced_step_closure
*) dsc_
;
7672 dsc
->cleanup (gdbarch
, regs
, dsc
);
7674 if (!dsc
->wrote_to_pc
)
7675 regcache_cooked_write_unsigned (regs
, ARM_PC_REGNUM
,
7676 dsc
->insn_addr
+ dsc
->insn_size
);
7680 #include "bfd-in2.h"
7681 #include "libcoff.h"
7684 gdb_print_insn_arm (bfd_vma memaddr
, disassemble_info
*info
)
7686 gdb_disassembler
*di
7687 = static_cast<gdb_disassembler
*>(info
->application_data
);
7688 struct gdbarch
*gdbarch
= di
->arch ();
7690 if (arm_pc_is_thumb (gdbarch
, memaddr
))
7692 static asymbol
*asym
;
7693 static combined_entry_type ce
;
7694 static struct coff_symbol_struct csym
;
7695 static struct bfd fake_bfd
;
7696 static bfd_target fake_target
;
7698 if (csym
.native
== NULL
)
7700 /* Create a fake symbol vector containing a Thumb symbol.
7701 This is solely so that the code in print_insn_little_arm()
7702 and print_insn_big_arm() in opcodes/arm-dis.c will detect
7703 the presence of a Thumb symbol and switch to decoding
7704 Thumb instructions. */
7706 fake_target
.flavour
= bfd_target_coff_flavour
;
7707 fake_bfd
.xvec
= &fake_target
;
7708 ce
.u
.syment
.n_sclass
= C_THUMBEXTFUNC
;
7710 csym
.symbol
.the_bfd
= &fake_bfd
;
7711 csym
.symbol
.name
= "fake";
7712 asym
= (asymbol
*) & csym
;
7715 memaddr
= UNMAKE_THUMB_ADDR (memaddr
);
7716 info
->symbols
= &asym
;
7719 info
->symbols
= NULL
;
7721 /* GDB is able to get bfd_mach from the exe_bfd, info->mach is
7722 accurate, so mark USER_SPECIFIED_MACHINE_TYPE bit. Otherwise,
7723 opcodes/arm-dis.c:print_insn reset info->mach, and it will trigger
7724 the assert on the mismatch of info->mach and bfd_get_mach (exec_bfd)
7725 in default_print_insn. */
7726 if (exec_bfd
!= NULL
)
7727 info
->flags
|= USER_SPECIFIED_MACHINE_TYPE
;
7729 return default_print_insn (memaddr
, info
);
7732 /* The following define instruction sequences that will cause ARM
7733 cpu's to take an undefined instruction trap. These are used to
7734 signal a breakpoint to GDB.
7736 The newer ARMv4T cpu's are capable of operating in ARM or Thumb
7737 modes. A different instruction is required for each mode. The ARM
7738 cpu's can also be big or little endian. Thus four different
7739 instructions are needed to support all cases.
7741 Note: ARMv4 defines several new instructions that will take the
7742 undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does
7743 not in fact add the new instructions. The new undefined
7744 instructions in ARMv4 are all instructions that had no defined
7745 behaviour in earlier chips. There is no guarantee that they will
7746 raise an exception, but may be treated as NOP's. In practice, it
7747 may only safe to rely on instructions matching:
7749 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
7750 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
7751 C C C C 0 1 1 x x x x x x x x x x x x x x x x x x x x 1 x x x x
7753 Even this may only true if the condition predicate is true. The
7754 following use a condition predicate of ALWAYS so it is always TRUE.
7756 There are other ways of forcing a breakpoint. GNU/Linux, RISC iX,
7757 and NetBSD all use a software interrupt rather than an undefined
7758 instruction to force a trap. This can be handled by by the
7759 abi-specific code during establishment of the gdbarch vector. */
7761 #define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7}
7762 #define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE}
7763 #define THUMB_LE_BREAKPOINT {0xbe,0xbe}
7764 #define THUMB_BE_BREAKPOINT {0xbe,0xbe}
7766 static const gdb_byte arm_default_arm_le_breakpoint
[] = ARM_LE_BREAKPOINT
;
7767 static const gdb_byte arm_default_arm_be_breakpoint
[] = ARM_BE_BREAKPOINT
;
7768 static const gdb_byte arm_default_thumb_le_breakpoint
[] = THUMB_LE_BREAKPOINT
;
7769 static const gdb_byte arm_default_thumb_be_breakpoint
[] = THUMB_BE_BREAKPOINT
;
7771 /* Implement the breakpoint_kind_from_pc gdbarch method. */
7774 arm_breakpoint_kind_from_pc (struct gdbarch
*gdbarch
, CORE_ADDR
*pcptr
)
7776 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
7777 enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch
);
7779 if (arm_pc_is_thumb (gdbarch
, *pcptr
))
7781 *pcptr
= UNMAKE_THUMB_ADDR (*pcptr
);
7783 /* If we have a separate 32-bit breakpoint instruction for Thumb-2,
7784 check whether we are replacing a 32-bit instruction. */
7785 if (tdep
->thumb2_breakpoint
!= NULL
)
7789 if (target_read_memory (*pcptr
, buf
, 2) == 0)
7791 unsigned short inst1
;
7793 inst1
= extract_unsigned_integer (buf
, 2, byte_order_for_code
);
7794 if (thumb_insn_size (inst1
) == 4)
7795 return ARM_BP_KIND_THUMB2
;
7799 return ARM_BP_KIND_THUMB
;
7802 return ARM_BP_KIND_ARM
;
7806 /* Implement the sw_breakpoint_from_kind gdbarch method. */
7808 static const gdb_byte
*
7809 arm_sw_breakpoint_from_kind (struct gdbarch
*gdbarch
, int kind
, int *size
)
7811 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
7815 case ARM_BP_KIND_ARM
:
7816 *size
= tdep
->arm_breakpoint_size
;
7817 return tdep
->arm_breakpoint
;
7818 case ARM_BP_KIND_THUMB
:
7819 *size
= tdep
->thumb_breakpoint_size
;
7820 return tdep
->thumb_breakpoint
;
7821 case ARM_BP_KIND_THUMB2
:
7822 *size
= tdep
->thumb2_breakpoint_size
;
7823 return tdep
->thumb2_breakpoint
;
7825 gdb_assert_not_reached ("unexpected arm breakpoint kind");
7829 /* Implement the breakpoint_kind_from_current_state gdbarch method. */
7832 arm_breakpoint_kind_from_current_state (struct gdbarch
*gdbarch
,
7833 struct regcache
*regcache
,
7838 /* Check the memory pointed by PC is readable. */
7839 if (target_read_memory (regcache_read_pc (regcache
), buf
, 4) == 0)
7841 struct arm_get_next_pcs next_pcs_ctx
;
7843 arm_get_next_pcs_ctor (&next_pcs_ctx
,
7844 &arm_get_next_pcs_ops
,
7845 gdbarch_byte_order (gdbarch
),
7846 gdbarch_byte_order_for_code (gdbarch
),
7850 std::vector
<CORE_ADDR
> next_pcs
= arm_get_next_pcs (&next_pcs_ctx
);
7852 /* If MEMADDR is the next instruction of current pc, do the
7853 software single step computation, and get the thumb mode by
7854 the destination address. */
7855 for (CORE_ADDR pc
: next_pcs
)
7857 if (UNMAKE_THUMB_ADDR (pc
) == *pcptr
)
7859 if (IS_THUMB_ADDR (pc
))
7861 *pcptr
= MAKE_THUMB_ADDR (*pcptr
);
7862 return arm_breakpoint_kind_from_pc (gdbarch
, pcptr
);
7865 return ARM_BP_KIND_ARM
;
7870 return arm_breakpoint_kind_from_pc (gdbarch
, pcptr
);
7873 /* Extract from an array REGBUF containing the (raw) register state a
7874 function return value of type TYPE, and copy that, in virtual
7875 format, into VALBUF. */
7878 arm_extract_return_value (struct type
*type
, struct regcache
*regs
,
7881 struct gdbarch
*gdbarch
= regs
->arch ();
7882 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
7884 if (TYPE_CODE_FLT
== TYPE_CODE (type
))
7886 switch (gdbarch_tdep (gdbarch
)->fp_model
)
7890 /* The value is in register F0 in internal format. We need to
7891 extract the raw value and then convert it to the desired
7893 bfd_byte tmpbuf
[FP_REGISTER_SIZE
];
7895 regcache_cooked_read (regs
, ARM_F0_REGNUM
, tmpbuf
);
7896 target_float_convert (tmpbuf
, arm_ext_type (gdbarch
),
7901 case ARM_FLOAT_SOFT_FPA
:
7902 case ARM_FLOAT_SOFT_VFP
:
7903 /* ARM_FLOAT_VFP can arise if this is a variadic function so
7904 not using the VFP ABI code. */
7906 regcache_cooked_read (regs
, ARM_A1_REGNUM
, valbuf
);
7907 if (TYPE_LENGTH (type
) > 4)
7908 regcache_cooked_read (regs
, ARM_A1_REGNUM
+ 1,
7909 valbuf
+ INT_REGISTER_SIZE
);
7913 internal_error (__FILE__
, __LINE__
,
7914 _("arm_extract_return_value: "
7915 "Floating point model not supported"));
7919 else if (TYPE_CODE (type
) == TYPE_CODE_INT
7920 || TYPE_CODE (type
) == TYPE_CODE_CHAR
7921 || TYPE_CODE (type
) == TYPE_CODE_BOOL
7922 || TYPE_CODE (type
) == TYPE_CODE_PTR
7923 || TYPE_IS_REFERENCE (type
)
7924 || TYPE_CODE (type
) == TYPE_CODE_ENUM
)
7926 /* If the type is a plain integer, then the access is
7927 straight-forward. Otherwise we have to play around a bit
7929 int len
= TYPE_LENGTH (type
);
7930 int regno
= ARM_A1_REGNUM
;
7935 /* By using store_unsigned_integer we avoid having to do
7936 anything special for small big-endian values. */
7937 regcache_cooked_read_unsigned (regs
, regno
++, &tmp
);
7938 store_unsigned_integer (valbuf
,
7939 (len
> INT_REGISTER_SIZE
7940 ? INT_REGISTER_SIZE
: len
),
7942 len
-= INT_REGISTER_SIZE
;
7943 valbuf
+= INT_REGISTER_SIZE
;
7948 /* For a structure or union the behaviour is as if the value had
7949 been stored to word-aligned memory and then loaded into
7950 registers with 32-bit load instruction(s). */
7951 int len
= TYPE_LENGTH (type
);
7952 int regno
= ARM_A1_REGNUM
;
7953 bfd_byte tmpbuf
[INT_REGISTER_SIZE
];
7957 regcache_cooked_read (regs
, regno
++, tmpbuf
);
7958 memcpy (valbuf
, tmpbuf
,
7959 len
> INT_REGISTER_SIZE
? INT_REGISTER_SIZE
: len
);
7960 len
-= INT_REGISTER_SIZE
;
7961 valbuf
+= INT_REGISTER_SIZE
;
7967 /* Will a function return an aggregate type in memory or in a
7968 register? Return 0 if an aggregate type can be returned in a
7969 register, 1 if it must be returned in memory. */
7972 arm_return_in_memory (struct gdbarch
*gdbarch
, struct type
*type
)
7974 enum type_code code
;
7976 type
= check_typedef (type
);
7978 /* Simple, non-aggregate types (ie not including vectors and
7979 complex) are always returned in a register (or registers). */
7980 code
= TYPE_CODE (type
);
7981 if (TYPE_CODE_STRUCT
!= code
&& TYPE_CODE_UNION
!= code
7982 && TYPE_CODE_ARRAY
!= code
&& TYPE_CODE_COMPLEX
!= code
)
7985 if (TYPE_CODE_ARRAY
== code
&& TYPE_VECTOR (type
))
7987 /* Vector values should be returned using ARM registers if they
7988 are not over 16 bytes. */
7989 return (TYPE_LENGTH (type
) > 16);
7992 if (gdbarch_tdep (gdbarch
)->arm_abi
!= ARM_ABI_APCS
)
7994 /* The AAPCS says all aggregates not larger than a word are returned
7996 if (TYPE_LENGTH (type
) <= INT_REGISTER_SIZE
)
8005 /* All aggregate types that won't fit in a register must be returned
8007 if (TYPE_LENGTH (type
) > INT_REGISTER_SIZE
)
8010 /* In the ARM ABI, "integer" like aggregate types are returned in
8011 registers. For an aggregate type to be integer like, its size
8012 must be less than or equal to INT_REGISTER_SIZE and the
8013 offset of each addressable subfield must be zero. Note that bit
8014 fields are not addressable, and all addressable subfields of
8015 unions always start at offset zero.
8017 This function is based on the behaviour of GCC 2.95.1.
8018 See: gcc/arm.c: arm_return_in_memory() for details.
8020 Note: All versions of GCC before GCC 2.95.2 do not set up the
8021 parameters correctly for a function returning the following
8022 structure: struct { float f;}; This should be returned in memory,
8023 not a register. Richard Earnshaw sent me a patch, but I do not
8024 know of any way to detect if a function like the above has been
8025 compiled with the correct calling convention. */
8027 /* Assume all other aggregate types can be returned in a register.
8028 Run a check for structures, unions and arrays. */
8031 if ((TYPE_CODE_STRUCT
== code
) || (TYPE_CODE_UNION
== code
))
8034 /* Need to check if this struct/union is "integer" like. For
8035 this to be true, its size must be less than or equal to
8036 INT_REGISTER_SIZE and the offset of each addressable
8037 subfield must be zero. Note that bit fields are not
8038 addressable, and unions always start at offset zero. If any
8039 of the subfields is a floating point type, the struct/union
8040 cannot be an integer type. */
8042 /* For each field in the object, check:
8043 1) Is it FP? --> yes, nRc = 1;
8044 2) Is it addressable (bitpos != 0) and
8045 not packed (bitsize == 0)?
8049 for (i
= 0; i
< TYPE_NFIELDS (type
); i
++)
8051 enum type_code field_type_code
;
8054 = TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type
,
8057 /* Is it a floating point type field? */
8058 if (field_type_code
== TYPE_CODE_FLT
)
8064 /* If bitpos != 0, then we have to care about it. */
8065 if (TYPE_FIELD_BITPOS (type
, i
) != 0)
8067 /* Bitfields are not addressable. If the field bitsize is
8068 zero, then the field is not packed. Hence it cannot be
8069 a bitfield or any other packed type. */
8070 if (TYPE_FIELD_BITSIZE (type
, i
) == 0)
8083 /* Write into appropriate registers a function return value of type
8084 TYPE, given in virtual format. */
8087 arm_store_return_value (struct type
*type
, struct regcache
*regs
,
8088 const gdb_byte
*valbuf
)
8090 struct gdbarch
*gdbarch
= regs
->arch ();
8091 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
8093 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
8095 gdb_byte buf
[FP_REGISTER_SIZE
];
8097 switch (gdbarch_tdep (gdbarch
)->fp_model
)
8101 target_float_convert (valbuf
, type
, buf
, arm_ext_type (gdbarch
));
8102 regcache_cooked_write (regs
, ARM_F0_REGNUM
, buf
);
8105 case ARM_FLOAT_SOFT_FPA
:
8106 case ARM_FLOAT_SOFT_VFP
:
8107 /* ARM_FLOAT_VFP can arise if this is a variadic function so
8108 not using the VFP ABI code. */
8110 regcache_cooked_write (regs
, ARM_A1_REGNUM
, valbuf
);
8111 if (TYPE_LENGTH (type
) > 4)
8112 regcache_cooked_write (regs
, ARM_A1_REGNUM
+ 1,
8113 valbuf
+ INT_REGISTER_SIZE
);
8117 internal_error (__FILE__
, __LINE__
,
8118 _("arm_store_return_value: Floating "
8119 "point model not supported"));
8123 else if (TYPE_CODE (type
) == TYPE_CODE_INT
8124 || TYPE_CODE (type
) == TYPE_CODE_CHAR
8125 || TYPE_CODE (type
) == TYPE_CODE_BOOL
8126 || TYPE_CODE (type
) == TYPE_CODE_PTR
8127 || TYPE_IS_REFERENCE (type
)
8128 || TYPE_CODE (type
) == TYPE_CODE_ENUM
)
8130 if (TYPE_LENGTH (type
) <= 4)
8132 /* Values of one word or less are zero/sign-extended and
8134 bfd_byte tmpbuf
[INT_REGISTER_SIZE
];
8135 LONGEST val
= unpack_long (type
, valbuf
);
8137 store_signed_integer (tmpbuf
, INT_REGISTER_SIZE
, byte_order
, val
);
8138 regcache_cooked_write (regs
, ARM_A1_REGNUM
, tmpbuf
);
8142 /* Integral values greater than one word are stored in consecutive
8143 registers starting with r0. This will always be a multiple of
8144 the regiser size. */
8145 int len
= TYPE_LENGTH (type
);
8146 int regno
= ARM_A1_REGNUM
;
8150 regcache_cooked_write (regs
, regno
++, valbuf
);
8151 len
-= INT_REGISTER_SIZE
;
8152 valbuf
+= INT_REGISTER_SIZE
;
8158 /* For a structure or union the behaviour is as if the value had
8159 been stored to word-aligned memory and then loaded into
8160 registers with 32-bit load instruction(s). */
8161 int len
= TYPE_LENGTH (type
);
8162 int regno
= ARM_A1_REGNUM
;
8163 bfd_byte tmpbuf
[INT_REGISTER_SIZE
];
8167 memcpy (tmpbuf
, valbuf
,
8168 len
> INT_REGISTER_SIZE
? INT_REGISTER_SIZE
: len
);
8169 regcache_cooked_write (regs
, regno
++, tmpbuf
);
8170 len
-= INT_REGISTER_SIZE
;
8171 valbuf
+= INT_REGISTER_SIZE
;
8177 /* Handle function return values. */
8179 static enum return_value_convention
8180 arm_return_value (struct gdbarch
*gdbarch
, struct value
*function
,
8181 struct type
*valtype
, struct regcache
*regcache
,
8182 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
8184 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
8185 struct type
*func_type
= function
? value_type (function
) : NULL
;
8186 enum arm_vfp_cprc_base_type vfp_base_type
;
8189 if (arm_vfp_abi_for_function (gdbarch
, func_type
)
8190 && arm_vfp_call_candidate (valtype
, &vfp_base_type
, &vfp_base_count
))
8192 int reg_char
= arm_vfp_cprc_reg_char (vfp_base_type
);
8193 int unit_length
= arm_vfp_cprc_unit_length (vfp_base_type
);
8195 for (i
= 0; i
< vfp_base_count
; i
++)
8197 if (reg_char
== 'q')
8200 arm_neon_quad_write (gdbarch
, regcache
, i
,
8201 writebuf
+ i
* unit_length
);
8204 arm_neon_quad_read (gdbarch
, regcache
, i
,
8205 readbuf
+ i
* unit_length
);
8212 xsnprintf (name_buf
, sizeof (name_buf
), "%c%d", reg_char
, i
);
8213 regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
8216 regcache_cooked_write (regcache
, regnum
,
8217 writebuf
+ i
* unit_length
);
8219 regcache_cooked_read (regcache
, regnum
,
8220 readbuf
+ i
* unit_length
);
8223 return RETURN_VALUE_REGISTER_CONVENTION
;
8226 if (TYPE_CODE (valtype
) == TYPE_CODE_STRUCT
8227 || TYPE_CODE (valtype
) == TYPE_CODE_UNION
8228 || TYPE_CODE (valtype
) == TYPE_CODE_ARRAY
)
8230 if (tdep
->struct_return
== pcc_struct_return
8231 || arm_return_in_memory (gdbarch
, valtype
))
8232 return RETURN_VALUE_STRUCT_CONVENTION
;
8234 else if (TYPE_CODE (valtype
) == TYPE_CODE_COMPLEX
)
8236 if (arm_return_in_memory (gdbarch
, valtype
))
8237 return RETURN_VALUE_STRUCT_CONVENTION
;
8241 arm_store_return_value (valtype
, regcache
, writebuf
);
8244 arm_extract_return_value (valtype
, regcache
, readbuf
);
8246 return RETURN_VALUE_REGISTER_CONVENTION
;
8251 arm_get_longjmp_target (struct frame_info
*frame
, CORE_ADDR
*pc
)
8253 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
8254 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
8255 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
8257 gdb_byte buf
[INT_REGISTER_SIZE
];
8259 jb_addr
= get_frame_register_unsigned (frame
, ARM_A1_REGNUM
);
8261 if (target_read_memory (jb_addr
+ tdep
->jb_pc
* tdep
->jb_elt_size
, buf
,
8265 *pc
= extract_unsigned_integer (buf
, INT_REGISTER_SIZE
, byte_order
);
8269 /* Recognize GCC and GNU ld's trampolines. If we are in a trampoline,
8270 return the target PC. Otherwise return 0. */
8273 arm_skip_stub (struct frame_info
*frame
, CORE_ADDR pc
)
8277 CORE_ADDR start_addr
;
8279 /* Find the starting address and name of the function containing the PC. */
8280 if (find_pc_partial_function (pc
, &name
, &start_addr
, NULL
) == 0)
8282 /* Trampoline 'bx reg' doesn't belong to any functions. Do the
8284 start_addr
= arm_skip_bx_reg (frame
, pc
);
8285 if (start_addr
!= 0)
8291 /* If PC is in a Thumb call or return stub, return the address of the
8292 target PC, which is in a register. The thunk functions are called
8293 _call_via_xx, where x is the register name. The possible names
8294 are r0-r9, sl, fp, ip, sp, and lr. ARM RealView has similar
8295 functions, named __ARM_call_via_r[0-7]. */
8296 if (startswith (name
, "_call_via_")
8297 || startswith (name
, "__ARM_call_via_"))
8299 /* Use the name suffix to determine which register contains the
8301 static const char *table
[15] =
8302 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
8303 "r8", "r9", "sl", "fp", "ip", "sp", "lr"
8306 int offset
= strlen (name
) - 2;
8308 for (regno
= 0; regno
<= 14; regno
++)
8309 if (strcmp (&name
[offset
], table
[regno
]) == 0)
8310 return get_frame_register_unsigned (frame
, regno
);
8313 /* GNU ld generates __foo_from_arm or __foo_from_thumb for
8314 non-interworking calls to foo. We could decode the stubs
8315 to find the target but it's easier to use the symbol table. */
8316 namelen
= strlen (name
);
8317 if (name
[0] == '_' && name
[1] == '_'
8318 && ((namelen
> 2 + strlen ("_from_thumb")
8319 && startswith (name
+ namelen
- strlen ("_from_thumb"), "_from_thumb"))
8320 || (namelen
> 2 + strlen ("_from_arm")
8321 && startswith (name
+ namelen
- strlen ("_from_arm"), "_from_arm"))))
8324 int target_len
= namelen
- 2;
8325 struct bound_minimal_symbol minsym
;
8326 struct objfile
*objfile
;
8327 struct obj_section
*sec
;
8329 if (name
[namelen
- 1] == 'b')
8330 target_len
-= strlen ("_from_thumb");
8332 target_len
-= strlen ("_from_arm");
8334 target_name
= (char *) alloca (target_len
+ 1);
8335 memcpy (target_name
, name
+ 2, target_len
);
8336 target_name
[target_len
] = '\0';
8338 sec
= find_pc_section (pc
);
8339 objfile
= (sec
== NULL
) ? NULL
: sec
->objfile
;
8340 minsym
= lookup_minimal_symbol (target_name
, NULL
, objfile
);
8341 if (minsym
.minsym
!= NULL
)
8342 return BMSYMBOL_VALUE_ADDRESS (minsym
);
8347 return 0; /* not a stub */
8351 set_arm_command (const char *args
, int from_tty
)
8353 printf_unfiltered (_("\
8354 \"set arm\" must be followed by an apporpriate subcommand.\n"));
8355 help_list (setarmcmdlist
, "set arm ", all_commands
, gdb_stdout
);
8359 show_arm_command (const char *args
, int from_tty
)
8361 cmd_show_list (showarmcmdlist
, from_tty
, "");
8365 arm_update_current_architecture (void)
8367 struct gdbarch_info info
;
8369 /* If the current architecture is not ARM, we have nothing to do. */
8370 if (gdbarch_bfd_arch_info (target_gdbarch ())->arch
!= bfd_arch_arm
)
8373 /* Update the architecture. */
8374 gdbarch_info_init (&info
);
8376 if (!gdbarch_update_p (info
))
8377 internal_error (__FILE__
, __LINE__
, _("could not update architecture"));
8381 set_fp_model_sfunc (const char *args
, int from_tty
,
8382 struct cmd_list_element
*c
)
8386 for (fp_model
= ARM_FLOAT_AUTO
; fp_model
!= ARM_FLOAT_LAST
; fp_model
++)
8387 if (strcmp (current_fp_model
, fp_model_strings
[fp_model
]) == 0)
8389 arm_fp_model
= (enum arm_float_model
) fp_model
;
8393 if (fp_model
== ARM_FLOAT_LAST
)
8394 internal_error (__FILE__
, __LINE__
, _("Invalid fp model accepted: %s."),
8397 arm_update_current_architecture ();
8401 show_fp_model (struct ui_file
*file
, int from_tty
,
8402 struct cmd_list_element
*c
, const char *value
)
8404 struct gdbarch_tdep
*tdep
= gdbarch_tdep (target_gdbarch ());
8406 if (arm_fp_model
== ARM_FLOAT_AUTO
8407 && gdbarch_bfd_arch_info (target_gdbarch ())->arch
== bfd_arch_arm
)
8408 fprintf_filtered (file
, _("\
8409 The current ARM floating point model is \"auto\" (currently \"%s\").\n"),
8410 fp_model_strings
[tdep
->fp_model
]);
8412 fprintf_filtered (file
, _("\
8413 The current ARM floating point model is \"%s\".\n"),
8414 fp_model_strings
[arm_fp_model
]);
8418 arm_set_abi (const char *args
, int from_tty
,
8419 struct cmd_list_element
*c
)
8423 for (arm_abi
= ARM_ABI_AUTO
; arm_abi
!= ARM_ABI_LAST
; arm_abi
++)
8424 if (strcmp (arm_abi_string
, arm_abi_strings
[arm_abi
]) == 0)
8426 arm_abi_global
= (enum arm_abi_kind
) arm_abi
;
8430 if (arm_abi
== ARM_ABI_LAST
)
8431 internal_error (__FILE__
, __LINE__
, _("Invalid ABI accepted: %s."),
8434 arm_update_current_architecture ();
8438 arm_show_abi (struct ui_file
*file
, int from_tty
,
8439 struct cmd_list_element
*c
, const char *value
)
8441 struct gdbarch_tdep
*tdep
= gdbarch_tdep (target_gdbarch ());
8443 if (arm_abi_global
== ARM_ABI_AUTO
8444 && gdbarch_bfd_arch_info (target_gdbarch ())->arch
== bfd_arch_arm
)
8445 fprintf_filtered (file
, _("\
8446 The current ARM ABI is \"auto\" (currently \"%s\").\n"),
8447 arm_abi_strings
[tdep
->arm_abi
]);
8449 fprintf_filtered (file
, _("The current ARM ABI is \"%s\".\n"),
8454 arm_show_fallback_mode (struct ui_file
*file
, int from_tty
,
8455 struct cmd_list_element
*c
, const char *value
)
8457 fprintf_filtered (file
,
8458 _("The current execution mode assumed "
8459 "(when symbols are unavailable) is \"%s\".\n"),
8460 arm_fallback_mode_string
);
8464 arm_show_force_mode (struct ui_file
*file
, int from_tty
,
8465 struct cmd_list_element
*c
, const char *value
)
8467 fprintf_filtered (file
,
8468 _("The current execution mode assumed "
8469 "(even when symbols are available) is \"%s\".\n"),
8470 arm_force_mode_string
);
8473 /* If the user changes the register disassembly style used for info
8474 register and other commands, we have to also switch the style used
8475 in opcodes for disassembly output. This function is run in the "set
8476 arm disassembly" command, and does that. */
8479 set_disassembly_style_sfunc (const char *args
, int from_tty
,
8480 struct cmd_list_element
*c
)
8482 /* Convert the short style name into the long style name (eg, reg-names-*)
8483 before calling the generic set_disassembler_options() function. */
8484 std::string long_name
= std::string ("reg-names-") + disassembly_style
;
8485 set_disassembler_options (&long_name
[0]);
8489 show_disassembly_style_sfunc (struct ui_file
*file
, int from_tty
,
8490 struct cmd_list_element
*c
, const char *value
)
8492 struct gdbarch
*gdbarch
= get_current_arch ();
8493 char *options
= get_disassembler_options (gdbarch
);
8494 const char *style
= "";
8498 FOR_EACH_DISASSEMBLER_OPTION (opt
, options
)
8499 if (CONST_STRNEQ (opt
, "reg-names-"))
8501 style
= &opt
[strlen ("reg-names-")];
8502 len
= strcspn (style
, ",");
8505 fprintf_unfiltered (file
, "The disassembly style is \"%.*s\".\n", len
, style
);
8508 /* Return the ARM register name corresponding to register I. */
8510 arm_register_name (struct gdbarch
*gdbarch
, int i
)
8512 const int num_regs
= gdbarch_num_regs (gdbarch
);
8514 if (gdbarch_tdep (gdbarch
)->have_vfp_pseudos
8515 && i
>= num_regs
&& i
< num_regs
+ 32)
8517 static const char *const vfp_pseudo_names
[] = {
8518 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
8519 "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15",
8520 "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23",
8521 "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",
8524 return vfp_pseudo_names
[i
- num_regs
];
8527 if (gdbarch_tdep (gdbarch
)->have_neon_pseudos
8528 && i
>= num_regs
+ 32 && i
< num_regs
+ 32 + 16)
8530 static const char *const neon_pseudo_names
[] = {
8531 "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7",
8532 "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15",
8535 return neon_pseudo_names
[i
- num_regs
- 32];
8538 if (i
>= ARRAY_SIZE (arm_register_names
))
8539 /* These registers are only supported on targets which supply
8540 an XML description. */
8543 return arm_register_names
[i
];
8546 /* Test whether the coff symbol specific value corresponds to a Thumb
8550 coff_sym_is_thumb (int val
)
8552 return (val
== C_THUMBEXT
8553 || val
== C_THUMBSTAT
8554 || val
== C_THUMBEXTFUNC
8555 || val
== C_THUMBSTATFUNC
8556 || val
== C_THUMBLABEL
);
8559 /* arm_coff_make_msymbol_special()
8560 arm_elf_make_msymbol_special()
8562 These functions test whether the COFF or ELF symbol corresponds to
8563 an address in thumb code, and set a "special" bit in a minimal
8564 symbol to indicate that it does. */
8567 arm_elf_make_msymbol_special(asymbol
*sym
, struct minimal_symbol
*msym
)
8569 elf_symbol_type
*elfsym
= (elf_symbol_type
*) sym
;
8571 if (ARM_GET_SYM_BRANCH_TYPE (elfsym
->internal_elf_sym
.st_target_internal
)
8572 == ST_BRANCH_TO_THUMB
)
8573 MSYMBOL_SET_SPECIAL (msym
);
8577 arm_coff_make_msymbol_special(int val
, struct minimal_symbol
*msym
)
8579 if (coff_sym_is_thumb (val
))
8580 MSYMBOL_SET_SPECIAL (msym
);
8584 arm_objfile_data_free (struct objfile
*objfile
, void *arg
)
8586 struct arm_per_objfile
*data
= (struct arm_per_objfile
*) arg
;
8589 for (i
= 0; i
< objfile
->obfd
->section_count
; i
++)
8590 VEC_free (arm_mapping_symbol_s
, data
->section_maps
[i
]);
8594 arm_record_special_symbol (struct gdbarch
*gdbarch
, struct objfile
*objfile
,
8597 const char *name
= bfd_asymbol_name (sym
);
8598 struct arm_per_objfile
*data
;
8599 VEC(arm_mapping_symbol_s
) **map_p
;
8600 struct arm_mapping_symbol new_map_sym
;
8602 gdb_assert (name
[0] == '$');
8603 if (name
[1] != 'a' && name
[1] != 't' && name
[1] != 'd')
8606 data
= (struct arm_per_objfile
*) objfile_data (objfile
,
8607 arm_objfile_data_key
);
8610 data
= OBSTACK_ZALLOC (&objfile
->objfile_obstack
,
8611 struct arm_per_objfile
);
8612 set_objfile_data (objfile
, arm_objfile_data_key
, data
);
8613 data
->section_maps
= OBSTACK_CALLOC (&objfile
->objfile_obstack
,
8614 objfile
->obfd
->section_count
,
8615 VEC(arm_mapping_symbol_s
) *);
8617 map_p
= &data
->section_maps
[bfd_get_section (sym
)->index
];
8619 new_map_sym
.value
= sym
->value
;
8620 new_map_sym
.type
= name
[1];
8622 /* Assume that most mapping symbols appear in order of increasing
8623 value. If they were randomly distributed, it would be faster to
8624 always push here and then sort at first use. */
8625 if (!VEC_empty (arm_mapping_symbol_s
, *map_p
))
8627 struct arm_mapping_symbol
*prev_map_sym
;
8629 prev_map_sym
= VEC_last (arm_mapping_symbol_s
, *map_p
);
8630 if (prev_map_sym
->value
>= sym
->value
)
8633 idx
= VEC_lower_bound (arm_mapping_symbol_s
, *map_p
, &new_map_sym
,
8634 arm_compare_mapping_symbols
);
8635 VEC_safe_insert (arm_mapping_symbol_s
, *map_p
, idx
, &new_map_sym
);
8640 VEC_safe_push (arm_mapping_symbol_s
, *map_p
, &new_map_sym
);
8644 arm_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
8646 struct gdbarch
*gdbarch
= regcache
->arch ();
8647 regcache_cooked_write_unsigned (regcache
, ARM_PC_REGNUM
, pc
);
8649 /* If necessary, set the T bit. */
8652 ULONGEST val
, t_bit
;
8653 regcache_cooked_read_unsigned (regcache
, ARM_PS_REGNUM
, &val
);
8654 t_bit
= arm_psr_thumb_bit (gdbarch
);
8655 if (arm_pc_is_thumb (gdbarch
, pc
))
8656 regcache_cooked_write_unsigned (regcache
, ARM_PS_REGNUM
,
8659 regcache_cooked_write_unsigned (regcache
, ARM_PS_REGNUM
,
8664 /* Read the contents of a NEON quad register, by reading from two
8665 double registers. This is used to implement the quad pseudo
8666 registers, and for argument passing in case the quad registers are
8667 missing; vectors are passed in quad registers when using the VFP
8668 ABI, even if a NEON unit is not present. REGNUM is the index of
8669 the quad register, in [0, 15]. */
8671 static enum register_status
8672 arm_neon_quad_read (struct gdbarch
*gdbarch
, readable_regcache
*regcache
,
8673 int regnum
, gdb_byte
*buf
)
8676 gdb_byte reg_buf
[8];
8677 int offset
, double_regnum
;
8678 enum register_status status
;
8680 xsnprintf (name_buf
, sizeof (name_buf
), "d%d", regnum
<< 1);
8681 double_regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
8684 /* d0 is always the least significant half of q0. */
8685 if (gdbarch_byte_order (gdbarch
) == BFD_ENDIAN_BIG
)
8690 status
= regcache
->raw_read (double_regnum
, reg_buf
);
8691 if (status
!= REG_VALID
)
8693 memcpy (buf
+ offset
, reg_buf
, 8);
8695 offset
= 8 - offset
;
8696 status
= regcache
->raw_read (double_regnum
+ 1, reg_buf
);
8697 if (status
!= REG_VALID
)
8699 memcpy (buf
+ offset
, reg_buf
, 8);
8704 static enum register_status
8705 arm_pseudo_read (struct gdbarch
*gdbarch
, readable_regcache
*regcache
,
8706 int regnum
, gdb_byte
*buf
)
8708 const int num_regs
= gdbarch_num_regs (gdbarch
);
8710 gdb_byte reg_buf
[8];
8711 int offset
, double_regnum
;
8713 gdb_assert (regnum
>= num_regs
);
8716 if (gdbarch_tdep (gdbarch
)->have_neon_pseudos
&& regnum
>= 32 && regnum
< 48)
8717 /* Quad-precision register. */
8718 return arm_neon_quad_read (gdbarch
, regcache
, regnum
- 32, buf
);
8721 enum register_status status
;
8723 /* Single-precision register. */
8724 gdb_assert (regnum
< 32);
8726 /* s0 is always the least significant half of d0. */
8727 if (gdbarch_byte_order (gdbarch
) == BFD_ENDIAN_BIG
)
8728 offset
= (regnum
& 1) ? 0 : 4;
8730 offset
= (regnum
& 1) ? 4 : 0;
8732 xsnprintf (name_buf
, sizeof (name_buf
), "d%d", regnum
>> 1);
8733 double_regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
8736 status
= regcache
->raw_read (double_regnum
, reg_buf
);
8737 if (status
== REG_VALID
)
8738 memcpy (buf
, reg_buf
+ offset
, 4);
8743 /* Store the contents of BUF to a NEON quad register, by writing to
8744 two double registers. This is used to implement the quad pseudo
8745 registers, and for argument passing in case the quad registers are
8746 missing; vectors are passed in quad registers when using the VFP
8747 ABI, even if a NEON unit is not present. REGNUM is the index
8748 of the quad register, in [0, 15]. */
8751 arm_neon_quad_write (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
8752 int regnum
, const gdb_byte
*buf
)
8755 int offset
, double_regnum
;
8757 xsnprintf (name_buf
, sizeof (name_buf
), "d%d", regnum
<< 1);
8758 double_regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
8761 /* d0 is always the least significant half of q0. */
8762 if (gdbarch_byte_order (gdbarch
) == BFD_ENDIAN_BIG
)
8767 regcache_raw_write (regcache
, double_regnum
, buf
+ offset
);
8768 offset
= 8 - offset
;
8769 regcache_raw_write (regcache
, double_regnum
+ 1, buf
+ offset
);
8773 arm_pseudo_write (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
8774 int regnum
, const gdb_byte
*buf
)
8776 const int num_regs
= gdbarch_num_regs (gdbarch
);
8778 gdb_byte reg_buf
[8];
8779 int offset
, double_regnum
;
8781 gdb_assert (regnum
>= num_regs
);
8784 if (gdbarch_tdep (gdbarch
)->have_neon_pseudos
&& regnum
>= 32 && regnum
< 48)
8785 /* Quad-precision register. */
8786 arm_neon_quad_write (gdbarch
, regcache
, regnum
- 32, buf
);
8789 /* Single-precision register. */
8790 gdb_assert (regnum
< 32);
8792 /* s0 is always the least significant half of d0. */
8793 if (gdbarch_byte_order (gdbarch
) == BFD_ENDIAN_BIG
)
8794 offset
= (regnum
& 1) ? 0 : 4;
8796 offset
= (regnum
& 1) ? 4 : 0;
8798 xsnprintf (name_buf
, sizeof (name_buf
), "d%d", regnum
>> 1);
8799 double_regnum
= user_reg_map_name_to_regnum (gdbarch
, name_buf
,
8802 regcache_raw_read (regcache
, double_regnum
, reg_buf
);
8803 memcpy (reg_buf
+ offset
, buf
, 4);
8804 regcache_raw_write (regcache
, double_regnum
, reg_buf
);
8808 static struct value
*
8809 value_of_arm_user_reg (struct frame_info
*frame
, const void *baton
)
8811 const int *reg_p
= (const int *) baton
;
8812 return value_of_register (*reg_p
, frame
);
8815 static enum gdb_osabi
8816 arm_elf_osabi_sniffer (bfd
*abfd
)
8818 unsigned int elfosabi
;
8819 enum gdb_osabi osabi
= GDB_OSABI_UNKNOWN
;
8821 elfosabi
= elf_elfheader (abfd
)->e_ident
[EI_OSABI
];
8823 if (elfosabi
== ELFOSABI_ARM
)
8824 /* GNU tools use this value. Check note sections in this case,
8826 bfd_map_over_sections (abfd
,
8827 generic_elf_osabi_sniff_abi_tag_sections
,
8830 /* Anything else will be handled by the generic ELF sniffer. */
8835 arm_register_reggroup_p (struct gdbarch
*gdbarch
, int regnum
,
8836 struct reggroup
*group
)
8838 /* FPS register's type is INT, but belongs to float_reggroup. Beside
8839 this, FPS register belongs to save_regroup, restore_reggroup, and
8840 all_reggroup, of course. */
8841 if (regnum
== ARM_FPS_REGNUM
)
8842 return (group
== float_reggroup
8843 || group
== save_reggroup
8844 || group
== restore_reggroup
8845 || group
== all_reggroup
);
8847 return default_register_reggroup_p (gdbarch
, regnum
, group
);
8851 /* For backward-compatibility we allow two 'g' packet lengths with
8852 the remote protocol depending on whether FPA registers are
8853 supplied. M-profile targets do not have FPA registers, but some
8854 stubs already exist in the wild which use a 'g' packet which
8855 supplies them albeit with dummy values. The packet format which
8856 includes FPA registers should be considered deprecated for
8857 M-profile targets. */
8860 arm_register_g_packet_guesses (struct gdbarch
*gdbarch
)
8862 if (gdbarch_tdep (gdbarch
)->is_m
)
8864 /* If we know from the executable this is an M-profile target,
8865 cater for remote targets whose register set layout is the
8866 same as the FPA layout. */
8867 register_remote_g_packet_guess (gdbarch
,
8868 /* r0-r12,sp,lr,pc; f0-f7; fps,xpsr */
8869 (16 * INT_REGISTER_SIZE
)
8870 + (8 * FP_REGISTER_SIZE
)
8871 + (2 * INT_REGISTER_SIZE
),
8872 tdesc_arm_with_m_fpa_layout
);
8874 /* The regular M-profile layout. */
8875 register_remote_g_packet_guess (gdbarch
,
8876 /* r0-r12,sp,lr,pc; xpsr */
8877 (16 * INT_REGISTER_SIZE
)
8878 + INT_REGISTER_SIZE
,
8881 /* M-profile plus M4F VFP. */
8882 register_remote_g_packet_guess (gdbarch
,
8883 /* r0-r12,sp,lr,pc; d0-d15; fpscr,xpsr */
8884 (16 * INT_REGISTER_SIZE
)
8885 + (16 * VFP_REGISTER_SIZE
)
8886 + (2 * INT_REGISTER_SIZE
),
8887 tdesc_arm_with_m_vfp_d16
);
8890 /* Otherwise we don't have a useful guess. */
8893 /* Implement the code_of_frame_writable gdbarch method. */
8896 arm_code_of_frame_writable (struct gdbarch
*gdbarch
, struct frame_info
*frame
)
8898 if (gdbarch_tdep (gdbarch
)->is_m
8899 && get_frame_type (frame
) == SIGTRAMP_FRAME
)
8901 /* M-profile exception frames return to some magic PCs, where
8902 isn't writable at all. */
8910 /* Initialize the current architecture based on INFO. If possible,
8911 re-use an architecture from ARCHES, which is a list of
8912 architectures already created during this debugging session.
8914 Called e.g. at program startup, when reading a core file, and when
8915 reading a binary file. */
8917 static struct gdbarch
*
8918 arm_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
8920 struct gdbarch_tdep
*tdep
;
8921 struct gdbarch
*gdbarch
;
8922 struct gdbarch_list
*best_arch
;
8923 enum arm_abi_kind arm_abi
= arm_abi_global
;
8924 enum arm_float_model fp_model
= arm_fp_model
;
8925 struct tdesc_arch_data
*tdesc_data
= NULL
;
8927 int vfp_register_count
= 0, have_vfp_pseudos
= 0, have_neon_pseudos
= 0;
8928 int have_wmmx_registers
= 0;
8930 int have_fpa_registers
= 1;
8931 const struct target_desc
*tdesc
= info
.target_desc
;
8933 /* If we have an object to base this architecture on, try to determine
8936 if (arm_abi
== ARM_ABI_AUTO
&& info
.abfd
!= NULL
)
8938 int ei_osabi
, e_flags
;
8940 switch (bfd_get_flavour (info
.abfd
))
8942 case bfd_target_coff_flavour
:
8943 /* Assume it's an old APCS-style ABI. */
8945 arm_abi
= ARM_ABI_APCS
;
8948 case bfd_target_elf_flavour
:
8949 ei_osabi
= elf_elfheader (info
.abfd
)->e_ident
[EI_OSABI
];
8950 e_flags
= elf_elfheader (info
.abfd
)->e_flags
;
8952 if (ei_osabi
== ELFOSABI_ARM
)
8954 /* GNU tools used to use this value, but do not for EABI
8955 objects. There's nowhere to tag an EABI version
8956 anyway, so assume APCS. */
8957 arm_abi
= ARM_ABI_APCS
;
8959 else if (ei_osabi
== ELFOSABI_NONE
|| ei_osabi
== ELFOSABI_GNU
)
8961 int eabi_ver
= EF_ARM_EABI_VERSION (e_flags
);
8962 int attr_arch
, attr_profile
;
8966 case EF_ARM_EABI_UNKNOWN
:
8967 /* Assume GNU tools. */
8968 arm_abi
= ARM_ABI_APCS
;
8971 case EF_ARM_EABI_VER4
:
8972 case EF_ARM_EABI_VER5
:
8973 arm_abi
= ARM_ABI_AAPCS
;
8974 /* EABI binaries default to VFP float ordering.
8975 They may also contain build attributes that can
8976 be used to identify if the VFP argument-passing
8978 if (fp_model
== ARM_FLOAT_AUTO
)
8981 switch (bfd_elf_get_obj_attr_int (info
.abfd
,
8985 case AEABI_VFP_args_base
:
8986 /* "The user intended FP parameter/result
8987 passing to conform to AAPCS, base
8989 fp_model
= ARM_FLOAT_SOFT_VFP
;
8991 case AEABI_VFP_args_vfp
:
8992 /* "The user intended FP parameter/result
8993 passing to conform to AAPCS, VFP
8995 fp_model
= ARM_FLOAT_VFP
;
8997 case AEABI_VFP_args_toolchain
:
8998 /* "The user intended FP parameter/result
8999 passing to conform to tool chain-specific
9000 conventions" - we don't know any such
9001 conventions, so leave it as "auto". */
9003 case AEABI_VFP_args_compatible
:
9004 /* "Code is compatible with both the base
9005 and VFP variants; the user did not permit
9006 non-variadic functions to pass FP
9007 parameters/results" - leave it as
9011 /* Attribute value not mentioned in the
9012 November 2012 ABI, so leave it as
9017 fp_model
= ARM_FLOAT_SOFT_VFP
;
9023 /* Leave it as "auto". */
9024 warning (_("unknown ARM EABI version 0x%x"), eabi_ver
);
9029 /* Detect M-profile programs. This only works if the
9030 executable file includes build attributes; GCC does
9031 copy them to the executable, but e.g. RealView does
9033 attr_arch
= bfd_elf_get_obj_attr_int (info
.abfd
, OBJ_ATTR_PROC
,
9035 attr_profile
= bfd_elf_get_obj_attr_int (info
.abfd
,
9037 Tag_CPU_arch_profile
);
9038 /* GCC specifies the profile for v6-M; RealView only
9039 specifies the profile for architectures starting with
9040 V7 (as opposed to architectures with a tag
9041 numerically greater than TAG_CPU_ARCH_V7). */
9042 if (!tdesc_has_registers (tdesc
)
9043 && (attr_arch
== TAG_CPU_ARCH_V6_M
9044 || attr_arch
== TAG_CPU_ARCH_V6S_M
9045 || attr_profile
== 'M'))
9050 if (fp_model
== ARM_FLOAT_AUTO
)
9052 int e_flags
= elf_elfheader (info
.abfd
)->e_flags
;
9054 switch (e_flags
& (EF_ARM_SOFT_FLOAT
| EF_ARM_VFP_FLOAT
))
9057 /* Leave it as "auto". Strictly speaking this case
9058 means FPA, but almost nobody uses that now, and
9059 many toolchains fail to set the appropriate bits
9060 for the floating-point model they use. */
9062 case EF_ARM_SOFT_FLOAT
:
9063 fp_model
= ARM_FLOAT_SOFT_FPA
;
9065 case EF_ARM_VFP_FLOAT
:
9066 fp_model
= ARM_FLOAT_VFP
;
9068 case EF_ARM_SOFT_FLOAT
| EF_ARM_VFP_FLOAT
:
9069 fp_model
= ARM_FLOAT_SOFT_VFP
;
9074 if (e_flags
& EF_ARM_BE8
)
9075 info
.byte_order_for_code
= BFD_ENDIAN_LITTLE
;
9080 /* Leave it as "auto". */
9085 /* Check any target description for validity. */
9086 if (tdesc_has_registers (tdesc
))
9088 /* For most registers we require GDB's default names; but also allow
9089 the numeric names for sp / lr / pc, as a convenience. */
9090 static const char *const arm_sp_names
[] = { "r13", "sp", NULL
};
9091 static const char *const arm_lr_names
[] = { "r14", "lr", NULL
};
9092 static const char *const arm_pc_names
[] = { "r15", "pc", NULL
};
9094 const struct tdesc_feature
*feature
;
9097 feature
= tdesc_find_feature (tdesc
,
9098 "org.gnu.gdb.arm.core");
9099 if (feature
== NULL
)
9101 feature
= tdesc_find_feature (tdesc
,
9102 "org.gnu.gdb.arm.m-profile");
9103 if (feature
== NULL
)
9109 tdesc_data
= tdesc_data_alloc ();
9112 for (i
= 0; i
< ARM_SP_REGNUM
; i
++)
9113 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
, i
,
9114 arm_register_names
[i
]);
9115 valid_p
&= tdesc_numbered_register_choices (feature
, tdesc_data
,
9118 valid_p
&= tdesc_numbered_register_choices (feature
, tdesc_data
,
9121 valid_p
&= tdesc_numbered_register_choices (feature
, tdesc_data
,
9125 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
,
9126 ARM_PS_REGNUM
, "xpsr");
9128 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
,
9129 ARM_PS_REGNUM
, "cpsr");
9133 tdesc_data_cleanup (tdesc_data
);
9137 feature
= tdesc_find_feature (tdesc
,
9138 "org.gnu.gdb.arm.fpa");
9139 if (feature
!= NULL
)
9142 for (i
= ARM_F0_REGNUM
; i
<= ARM_FPS_REGNUM
; i
++)
9143 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
, i
,
9144 arm_register_names
[i
]);
9147 tdesc_data_cleanup (tdesc_data
);
9152 have_fpa_registers
= 0;
9154 feature
= tdesc_find_feature (tdesc
,
9155 "org.gnu.gdb.xscale.iwmmxt");
9156 if (feature
!= NULL
)
9158 static const char *const iwmmxt_names
[] = {
9159 "wR0", "wR1", "wR2", "wR3", "wR4", "wR5", "wR6", "wR7",
9160 "wR8", "wR9", "wR10", "wR11", "wR12", "wR13", "wR14", "wR15",
9161 "wCID", "wCon", "wCSSF", "wCASF", "", "", "", "",
9162 "wCGR0", "wCGR1", "wCGR2", "wCGR3", "", "", "", "",
9166 for (i
= ARM_WR0_REGNUM
; i
<= ARM_WR15_REGNUM
; i
++)
9168 &= tdesc_numbered_register (feature
, tdesc_data
, i
,
9169 iwmmxt_names
[i
- ARM_WR0_REGNUM
]);
9171 /* Check for the control registers, but do not fail if they
9173 for (i
= ARM_WC0_REGNUM
; i
<= ARM_WCASF_REGNUM
; i
++)
9174 tdesc_numbered_register (feature
, tdesc_data
, i
,
9175 iwmmxt_names
[i
- ARM_WR0_REGNUM
]);
9177 for (i
= ARM_WCGR0_REGNUM
; i
<= ARM_WCGR3_REGNUM
; i
++)
9179 &= tdesc_numbered_register (feature
, tdesc_data
, i
,
9180 iwmmxt_names
[i
- ARM_WR0_REGNUM
]);
9184 tdesc_data_cleanup (tdesc_data
);
9188 have_wmmx_registers
= 1;
9191 /* If we have a VFP unit, check whether the single precision registers
9192 are present. If not, then we will synthesize them as pseudo
9194 feature
= tdesc_find_feature (tdesc
,
9195 "org.gnu.gdb.arm.vfp");
9196 if (feature
!= NULL
)
9198 static const char *const vfp_double_names
[] = {
9199 "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
9200 "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15",
9201 "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
9202 "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31",
9205 /* Require the double precision registers. There must be either
9208 for (i
= 0; i
< 32; i
++)
9210 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
,
9212 vfp_double_names
[i
]);
9216 if (!valid_p
&& i
== 16)
9219 /* Also require FPSCR. */
9220 valid_p
&= tdesc_numbered_register (feature
, tdesc_data
,
9221 ARM_FPSCR_REGNUM
, "fpscr");
9224 tdesc_data_cleanup (tdesc_data
);
9228 if (tdesc_unnumbered_register (feature
, "s0") == 0)
9229 have_vfp_pseudos
= 1;
9231 vfp_register_count
= i
;
9233 /* If we have VFP, also check for NEON. The architecture allows
9234 NEON without VFP (integer vector operations only), but GDB
9235 does not support that. */
9236 feature
= tdesc_find_feature (tdesc
,
9237 "org.gnu.gdb.arm.neon");
9238 if (feature
!= NULL
)
9240 /* NEON requires 32 double-precision registers. */
9243 tdesc_data_cleanup (tdesc_data
);
9247 /* If there are quad registers defined by the stub, use
9248 their type; otherwise (normally) provide them with
9249 the default type. */
9250 if (tdesc_unnumbered_register (feature
, "q0") == 0)
9251 have_neon_pseudos
= 1;
9258 /* If there is already a candidate, use it. */
9259 for (best_arch
= gdbarch_list_lookup_by_info (arches
, &info
);
9261 best_arch
= gdbarch_list_lookup_by_info (best_arch
->next
, &info
))
9263 if (arm_abi
!= ARM_ABI_AUTO
9264 && arm_abi
!= gdbarch_tdep (best_arch
->gdbarch
)->arm_abi
)
9267 if (fp_model
!= ARM_FLOAT_AUTO
9268 && fp_model
!= gdbarch_tdep (best_arch
->gdbarch
)->fp_model
)
9271 /* There are various other properties in tdep that we do not
9272 need to check here: those derived from a target description,
9273 since gdbarches with a different target description are
9274 automatically disqualified. */
9276 /* Do check is_m, though, since it might come from the binary. */
9277 if (is_m
!= gdbarch_tdep (best_arch
->gdbarch
)->is_m
)
9280 /* Found a match. */
9284 if (best_arch
!= NULL
)
9286 if (tdesc_data
!= NULL
)
9287 tdesc_data_cleanup (tdesc_data
);
9288 return best_arch
->gdbarch
;
9291 tdep
= XCNEW (struct gdbarch_tdep
);
9292 gdbarch
= gdbarch_alloc (&info
, tdep
);
9294 /* Record additional information about the architecture we are defining.
9295 These are gdbarch discriminators, like the OSABI. */
9296 tdep
->arm_abi
= arm_abi
;
9297 tdep
->fp_model
= fp_model
;
9299 tdep
->have_fpa_registers
= have_fpa_registers
;
9300 tdep
->have_wmmx_registers
= have_wmmx_registers
;
9301 gdb_assert (vfp_register_count
== 0
9302 || vfp_register_count
== 16
9303 || vfp_register_count
== 32);
9304 tdep
->vfp_register_count
= vfp_register_count
;
9305 tdep
->have_vfp_pseudos
= have_vfp_pseudos
;
9306 tdep
->have_neon_pseudos
= have_neon_pseudos
;
9307 tdep
->have_neon
= have_neon
;
9309 arm_register_g_packet_guesses (gdbarch
);
9312 switch (info
.byte_order_for_code
)
9314 case BFD_ENDIAN_BIG
:
9315 tdep
->arm_breakpoint
= arm_default_arm_be_breakpoint
;
9316 tdep
->arm_breakpoint_size
= sizeof (arm_default_arm_be_breakpoint
);
9317 tdep
->thumb_breakpoint
= arm_default_thumb_be_breakpoint
;
9318 tdep
->thumb_breakpoint_size
= sizeof (arm_default_thumb_be_breakpoint
);
9322 case BFD_ENDIAN_LITTLE
:
9323 tdep
->arm_breakpoint
= arm_default_arm_le_breakpoint
;
9324 tdep
->arm_breakpoint_size
= sizeof (arm_default_arm_le_breakpoint
);
9325 tdep
->thumb_breakpoint
= arm_default_thumb_le_breakpoint
;
9326 tdep
->thumb_breakpoint_size
= sizeof (arm_default_thumb_le_breakpoint
);
9331 internal_error (__FILE__
, __LINE__
,
9332 _("arm_gdbarch_init: bad byte order for float format"));
9335 /* On ARM targets char defaults to unsigned. */
9336 set_gdbarch_char_signed (gdbarch
, 0);
9338 /* wchar_t is unsigned under the AAPCS. */
9339 if (tdep
->arm_abi
== ARM_ABI_AAPCS
)
9340 set_gdbarch_wchar_signed (gdbarch
, 0);
9342 set_gdbarch_wchar_signed (gdbarch
, 1);
9344 /* Note: for displaced stepping, this includes the breakpoint, and one word
9345 of additional scratch space. This setting isn't used for anything beside
9346 displaced stepping at present. */
9347 set_gdbarch_max_insn_length (gdbarch
, 4 * DISPLACED_MODIFIED_INSNS
);
9349 /* This should be low enough for everything. */
9350 tdep
->lowest_pc
= 0x20;
9351 tdep
->jb_pc
= -1; /* Longjump support not enabled by default. */
9353 /* The default, for both APCS and AAPCS, is to return small
9354 structures in registers. */
9355 tdep
->struct_return
= reg_struct_return
;
9357 set_gdbarch_push_dummy_call (gdbarch
, arm_push_dummy_call
);
9358 set_gdbarch_frame_align (gdbarch
, arm_frame_align
);
9361 set_gdbarch_code_of_frame_writable (gdbarch
, arm_code_of_frame_writable
);
9363 set_gdbarch_write_pc (gdbarch
, arm_write_pc
);
9365 /* Frame handling. */
9366 set_gdbarch_dummy_id (gdbarch
, arm_dummy_id
);
9367 set_gdbarch_unwind_pc (gdbarch
, arm_unwind_pc
);
9368 set_gdbarch_unwind_sp (gdbarch
, arm_unwind_sp
);
9370 frame_base_set_default (gdbarch
, &arm_normal_base
);
9372 /* Address manipulation. */
9373 set_gdbarch_addr_bits_remove (gdbarch
, arm_addr_bits_remove
);
9375 /* Advance PC across function entry code. */
9376 set_gdbarch_skip_prologue (gdbarch
, arm_skip_prologue
);
9378 /* Detect whether PC is at a point where the stack has been destroyed. */
9379 set_gdbarch_stack_frame_destroyed_p (gdbarch
, arm_stack_frame_destroyed_p
);
9381 /* Skip trampolines. */
9382 set_gdbarch_skip_trampoline_code (gdbarch
, arm_skip_stub
);
9384 /* The stack grows downward. */
9385 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
9387 /* Breakpoint manipulation. */
9388 set_gdbarch_breakpoint_kind_from_pc (gdbarch
, arm_breakpoint_kind_from_pc
);
9389 set_gdbarch_sw_breakpoint_from_kind (gdbarch
, arm_sw_breakpoint_from_kind
);
9390 set_gdbarch_breakpoint_kind_from_current_state (gdbarch
,
9391 arm_breakpoint_kind_from_current_state
);
9393 /* Information about registers, etc. */
9394 set_gdbarch_sp_regnum (gdbarch
, ARM_SP_REGNUM
);
9395 set_gdbarch_pc_regnum (gdbarch
, ARM_PC_REGNUM
);
9396 set_gdbarch_num_regs (gdbarch
, ARM_NUM_REGS
);
9397 set_gdbarch_register_type (gdbarch
, arm_register_type
);
9398 set_gdbarch_register_reggroup_p (gdbarch
, arm_register_reggroup_p
);
9400 /* This "info float" is FPA-specific. Use the generic version if we
9402 if (gdbarch_tdep (gdbarch
)->have_fpa_registers
)
9403 set_gdbarch_print_float_info (gdbarch
, arm_print_float_info
);
9405 /* Internal <-> external register number maps. */
9406 set_gdbarch_dwarf2_reg_to_regnum (gdbarch
, arm_dwarf_reg_to_regnum
);
9407 set_gdbarch_register_sim_regno (gdbarch
, arm_register_sim_regno
);
9409 set_gdbarch_register_name (gdbarch
, arm_register_name
);
9411 /* Returning results. */
9412 set_gdbarch_return_value (gdbarch
, arm_return_value
);
9415 set_gdbarch_print_insn (gdbarch
, gdb_print_insn_arm
);
9417 /* Minsymbol frobbing. */
9418 set_gdbarch_elf_make_msymbol_special (gdbarch
, arm_elf_make_msymbol_special
);
9419 set_gdbarch_coff_make_msymbol_special (gdbarch
,
9420 arm_coff_make_msymbol_special
);
9421 set_gdbarch_record_special_symbol (gdbarch
, arm_record_special_symbol
);
9423 /* Thumb-2 IT block support. */
9424 set_gdbarch_adjust_breakpoint_address (gdbarch
,
9425 arm_adjust_breakpoint_address
);
9427 /* Virtual tables. */
9428 set_gdbarch_vbit_in_delta (gdbarch
, 1);
9430 /* Hook in the ABI-specific overrides, if they have been registered. */
9431 gdbarch_init_osabi (info
, gdbarch
);
9433 dwarf2_frame_set_init_reg (gdbarch
, arm_dwarf2_frame_init_reg
);
9435 /* Add some default predicates. */
9437 frame_unwind_append_unwinder (gdbarch
, &arm_m_exception_unwind
);
9438 frame_unwind_append_unwinder (gdbarch
, &arm_stub_unwind
);
9439 dwarf2_append_unwinders (gdbarch
);
9440 frame_unwind_append_unwinder (gdbarch
, &arm_exidx_unwind
);
9441 frame_unwind_append_unwinder (gdbarch
, &arm_epilogue_frame_unwind
);
9442 frame_unwind_append_unwinder (gdbarch
, &arm_prologue_unwind
);
9444 /* Now we have tuned the configuration, set a few final things,
9445 based on what the OS ABI has told us. */
9447 /* If the ABI is not otherwise marked, assume the old GNU APCS. EABI
9448 binaries are always marked. */
9449 if (tdep
->arm_abi
== ARM_ABI_AUTO
)
9450 tdep
->arm_abi
= ARM_ABI_APCS
;
9452 /* Watchpoints are not steppable. */
9453 set_gdbarch_have_nonsteppable_watchpoint (gdbarch
, 1);
9455 /* We used to default to FPA for generic ARM, but almost nobody
9456 uses that now, and we now provide a way for the user to force
9457 the model. So default to the most useful variant. */
9458 if (tdep
->fp_model
== ARM_FLOAT_AUTO
)
9459 tdep
->fp_model
= ARM_FLOAT_SOFT_FPA
;
9461 if (tdep
->jb_pc
>= 0)
9462 set_gdbarch_get_longjmp_target (gdbarch
, arm_get_longjmp_target
);
9464 /* Floating point sizes and format. */
9465 set_gdbarch_float_format (gdbarch
, floatformats_ieee_single
);
9466 if (tdep
->fp_model
== ARM_FLOAT_SOFT_FPA
|| tdep
->fp_model
== ARM_FLOAT_FPA
)
9468 set_gdbarch_double_format
9469 (gdbarch
, floatformats_ieee_double_littlebyte_bigword
);
9470 set_gdbarch_long_double_format
9471 (gdbarch
, floatformats_ieee_double_littlebyte_bigword
);
9475 set_gdbarch_double_format (gdbarch
, floatformats_ieee_double
);
9476 set_gdbarch_long_double_format (gdbarch
, floatformats_ieee_double
);
9479 if (have_vfp_pseudos
)
9481 /* NOTE: These are the only pseudo registers used by
9482 the ARM target at the moment. If more are added, a
9483 little more care in numbering will be needed. */
9485 int num_pseudos
= 32;
9486 if (have_neon_pseudos
)
9488 set_gdbarch_num_pseudo_regs (gdbarch
, num_pseudos
);
9489 set_gdbarch_pseudo_register_read (gdbarch
, arm_pseudo_read
);
9490 set_gdbarch_pseudo_register_write (gdbarch
, arm_pseudo_write
);
9495 set_tdesc_pseudo_register_name (gdbarch
, arm_register_name
);
9497 tdesc_use_registers (gdbarch
, tdesc
, tdesc_data
);
9499 /* Override tdesc_register_type to adjust the types of VFP
9500 registers for NEON. */
9501 set_gdbarch_register_type (gdbarch
, arm_register_type
);
9504 /* Add standard register aliases. We add aliases even for those
9505 nanes which are used by the current architecture - it's simpler,
9506 and does no harm, since nothing ever lists user registers. */
9507 for (i
= 0; i
< ARRAY_SIZE (arm_register_aliases
); i
++)
9508 user_reg_add (gdbarch
, arm_register_aliases
[i
].name
,
9509 value_of_arm_user_reg
, &arm_register_aliases
[i
].regnum
);
9511 set_gdbarch_disassembler_options (gdbarch
, &arm_disassembler_options
);
9512 set_gdbarch_valid_disassembler_options (gdbarch
, disassembler_options_arm ());
9518 arm_dump_tdep (struct gdbarch
*gdbarch
, struct ui_file
*file
)
9520 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
9525 fprintf_unfiltered (file
, _("arm_dump_tdep: Lowest pc = 0x%lx"),
9526 (unsigned long) tdep
->lowest_pc
);
9532 static void arm_record_test (void);
9537 _initialize_arm_tdep (void)
9541 char regdesc
[1024], *rdptr
= regdesc
;
9542 size_t rest
= sizeof (regdesc
);
9544 gdbarch_register (bfd_arch_arm
, arm_gdbarch_init
, arm_dump_tdep
);
9546 arm_objfile_data_key
9547 = register_objfile_data_with_cleanup (NULL
, arm_objfile_data_free
);
9549 /* Add ourselves to objfile event chain. */
9550 gdb::observers::new_objfile
.attach (arm_exidx_new_objfile
);
9552 = register_objfile_data_with_cleanup (NULL
, arm_exidx_data_free
);
9554 /* Register an ELF OS ABI sniffer for ARM binaries. */
9555 gdbarch_register_osabi_sniffer (bfd_arch_arm
,
9556 bfd_target_elf_flavour
,
9557 arm_elf_osabi_sniffer
);
9559 /* Initialize the standard target descriptions. */
9560 initialize_tdesc_arm_with_m ();
9561 initialize_tdesc_arm_with_m_fpa_layout ();
9562 initialize_tdesc_arm_with_m_vfp_d16 ();
9563 initialize_tdesc_arm_with_iwmmxt ();
9564 initialize_tdesc_arm_with_vfpv2 ();
9565 initialize_tdesc_arm_with_vfpv3 ();
9566 initialize_tdesc_arm_with_neon ();
9568 /* Add root prefix command for all "set arm"/"show arm" commands. */
9569 add_prefix_cmd ("arm", no_class
, set_arm_command
,
9570 _("Various ARM-specific commands."),
9571 &setarmcmdlist
, "set arm ", 0, &setlist
);
9573 add_prefix_cmd ("arm", no_class
, show_arm_command
,
9574 _("Various ARM-specific commands."),
9575 &showarmcmdlist
, "show arm ", 0, &showlist
);
9578 arm_disassembler_options
= xstrdup ("reg-names-std");
9579 const disasm_options_t
*disasm_options
= disassembler_options_arm ();
9580 int num_disassembly_styles
= 0;
9581 for (i
= 0; disasm_options
->name
[i
] != NULL
; i
++)
9582 if (CONST_STRNEQ (disasm_options
->name
[i
], "reg-names-"))
9583 num_disassembly_styles
++;
9585 /* Initialize the array that will be passed to add_setshow_enum_cmd(). */
9586 valid_disassembly_styles
= XNEWVEC (const char *,
9587 num_disassembly_styles
+ 1);
9588 for (i
= j
= 0; disasm_options
->name
[i
] != NULL
; i
++)
9589 if (CONST_STRNEQ (disasm_options
->name
[i
], "reg-names-"))
9591 size_t offset
= strlen ("reg-names-");
9592 const char *style
= disasm_options
->name
[i
];
9593 valid_disassembly_styles
[j
++] = &style
[offset
];
9594 length
= snprintf (rdptr
, rest
, "%s - %s\n", &style
[offset
],
9595 disasm_options
->description
[i
]);
9599 /* Mark the end of valid options. */
9600 valid_disassembly_styles
[num_disassembly_styles
] = NULL
;
9602 /* Create the help text. */
9603 std::string helptext
= string_printf ("%s%s%s",
9604 _("The valid values are:\n"),
9606 _("The default is \"std\"."));
9608 add_setshow_enum_cmd("disassembler", no_class
,
9609 valid_disassembly_styles
, &disassembly_style
,
9610 _("Set the disassembly style."),
9611 _("Show the disassembly style."),
9613 set_disassembly_style_sfunc
,
9614 show_disassembly_style_sfunc
,
9615 &setarmcmdlist
, &showarmcmdlist
);
9617 add_setshow_boolean_cmd ("apcs32", no_class
, &arm_apcs_32
,
9618 _("Set usage of ARM 32-bit mode."),
9619 _("Show usage of ARM 32-bit mode."),
9620 _("When off, a 26-bit PC will be used."),
9622 NULL
, /* FIXME: i18n: Usage of ARM 32-bit
9624 &setarmcmdlist
, &showarmcmdlist
);
9626 /* Add a command to allow the user to force the FPU model. */
9627 add_setshow_enum_cmd ("fpu", no_class
, fp_model_strings
, ¤t_fp_model
,
9628 _("Set the floating point type."),
9629 _("Show the floating point type."),
9630 _("auto - Determine the FP typefrom the OS-ABI.\n\
9631 softfpa - Software FP, mixed-endian doubles on little-endian ARMs.\n\
9632 fpa - FPA co-processor (GCC compiled).\n\
9633 softvfp - Software FP with pure-endian doubles.\n\
9634 vfp - VFP co-processor."),
9635 set_fp_model_sfunc
, show_fp_model
,
9636 &setarmcmdlist
, &showarmcmdlist
);
9638 /* Add a command to allow the user to force the ABI. */
9639 add_setshow_enum_cmd ("abi", class_support
, arm_abi_strings
, &arm_abi_string
,
9642 NULL
, arm_set_abi
, arm_show_abi
,
9643 &setarmcmdlist
, &showarmcmdlist
);
9645 /* Add two commands to allow the user to force the assumed
9647 add_setshow_enum_cmd ("fallback-mode", class_support
,
9648 arm_mode_strings
, &arm_fallback_mode_string
,
9649 _("Set the mode assumed when symbols are unavailable."),
9650 _("Show the mode assumed when symbols are unavailable."),
9651 NULL
, NULL
, arm_show_fallback_mode
,
9652 &setarmcmdlist
, &showarmcmdlist
);
9653 add_setshow_enum_cmd ("force-mode", class_support
,
9654 arm_mode_strings
, &arm_force_mode_string
,
9655 _("Set the mode assumed even when symbols are available."),
9656 _("Show the mode assumed even when symbols are available."),
9657 NULL
, NULL
, arm_show_force_mode
,
9658 &setarmcmdlist
, &showarmcmdlist
);
9660 /* Debugging flag. */
9661 add_setshow_boolean_cmd ("arm", class_maintenance
, &arm_debug
,
9662 _("Set ARM debugging."),
9663 _("Show ARM debugging."),
9664 _("When on, arm-specific debugging is enabled."),
9666 NULL
, /* FIXME: i18n: "ARM debugging is %s. */
9667 &setdebuglist
, &showdebuglist
);
9670 selftests::register_test ("arm-record", selftests::arm_record_test
);
9675 /* ARM-reversible process record data structures. */
9677 #define ARM_INSN_SIZE_BYTES 4
9678 #define THUMB_INSN_SIZE_BYTES 2
9679 #define THUMB2_INSN_SIZE_BYTES 4
9682 /* Position of the bit within a 32-bit ARM instruction
9683 that defines whether the instruction is a load or store. */
9684 #define INSN_S_L_BIT_NUM 20
9686 #define REG_ALLOC(REGS, LENGTH, RECORD_BUF) \
9689 unsigned int reg_len = LENGTH; \
9692 REGS = XNEWVEC (uint32_t, reg_len); \
9693 memcpy(®S[0], &RECORD_BUF[0], sizeof(uint32_t)*LENGTH); \
9698 #define MEM_ALLOC(MEMS, LENGTH, RECORD_BUF) \
9701 unsigned int mem_len = LENGTH; \
9704 MEMS = XNEWVEC (struct arm_mem_r, mem_len); \
9705 memcpy(&MEMS->len, &RECORD_BUF[0], \
9706 sizeof(struct arm_mem_r) * LENGTH); \
9711 /* Checks whether insn is already recorded or yet to be decoded. (boolean expression). */
9712 #define INSN_RECORDED(ARM_RECORD) \
9713 (0 != (ARM_RECORD)->reg_rec_count || 0 != (ARM_RECORD)->mem_rec_count)
9715 /* ARM memory record structure. */
9718 uint32_t len
; /* Record length. */
9719 uint32_t addr
; /* Memory address. */
9722 /* ARM instruction record contains opcode of current insn
9723 and execution state (before entry to decode_insn()),
9724 contains list of to-be-modified registers and
9725 memory blocks (on return from decode_insn()). */
9727 typedef struct insn_decode_record_t
9729 struct gdbarch
*gdbarch
;
9730 struct regcache
*regcache
;
9731 CORE_ADDR this_addr
; /* Address of the insn being decoded. */
9732 uint32_t arm_insn
; /* Should accommodate thumb. */
9733 uint32_t cond
; /* Condition code. */
9734 uint32_t opcode
; /* Insn opcode. */
9735 uint32_t decode
; /* Insn decode bits. */
9736 uint32_t mem_rec_count
; /* No of mem records. */
9737 uint32_t reg_rec_count
; /* No of reg records. */
9738 uint32_t *arm_regs
; /* Registers to be saved for this record. */
9739 struct arm_mem_r
*arm_mems
; /* Memory to be saved for this record. */
9740 } insn_decode_record
;
9743 /* Checks ARM SBZ and SBO mandatory fields. */
9746 sbo_sbz (uint32_t insn
, uint32_t bit_num
, uint32_t len
, uint32_t sbo
)
9748 uint32_t ones
= bits (insn
, bit_num
- 1, (bit_num
-1) + (len
- 1));
9767 enum arm_record_result
9769 ARM_RECORD_SUCCESS
= 0,
9770 ARM_RECORD_FAILURE
= 1
9777 } arm_record_strx_t
;
9788 arm_record_strx (insn_decode_record
*arm_insn_r
, uint32_t *record_buf
,
9789 uint32_t *record_buf_mem
, arm_record_strx_t str_type
)
9792 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
9793 ULONGEST u_regval
[2]= {0};
9795 uint32_t reg_src1
= 0, reg_src2
= 0;
9796 uint32_t immed_high
= 0, immed_low
= 0,offset_8
= 0, tgt_mem_addr
= 0;
9798 arm_insn_r
->opcode
= bits (arm_insn_r
->arm_insn
, 21, 24);
9799 arm_insn_r
->decode
= bits (arm_insn_r
->arm_insn
, 4, 7);
9801 if (14 == arm_insn_r
->opcode
|| 10 == arm_insn_r
->opcode
)
9803 /* 1) Handle misc store, immediate offset. */
9804 immed_low
= bits (arm_insn_r
->arm_insn
, 0, 3);
9805 immed_high
= bits (arm_insn_r
->arm_insn
, 8, 11);
9806 reg_src1
= bits (arm_insn_r
->arm_insn
, 16, 19);
9807 regcache_raw_read_unsigned (reg_cache
, reg_src1
,
9809 if (ARM_PC_REGNUM
== reg_src1
)
9811 /* If R15 was used as Rn, hence current PC+8. */
9812 u_regval
[0] = u_regval
[0] + 8;
9814 offset_8
= (immed_high
<< 4) | immed_low
;
9815 /* Calculate target store address. */
9816 if (14 == arm_insn_r
->opcode
)
9818 tgt_mem_addr
= u_regval
[0] + offset_8
;
9822 tgt_mem_addr
= u_regval
[0] - offset_8
;
9824 if (ARM_RECORD_STRH
== str_type
)
9826 record_buf_mem
[0] = 2;
9827 record_buf_mem
[1] = tgt_mem_addr
;
9828 arm_insn_r
->mem_rec_count
= 1;
9830 else if (ARM_RECORD_STRD
== str_type
)
9832 record_buf_mem
[0] = 4;
9833 record_buf_mem
[1] = tgt_mem_addr
;
9834 record_buf_mem
[2] = 4;
9835 record_buf_mem
[3] = tgt_mem_addr
+ 4;
9836 arm_insn_r
->mem_rec_count
= 2;
9839 else if (12 == arm_insn_r
->opcode
|| 8 == arm_insn_r
->opcode
)
9841 /* 2) Store, register offset. */
9843 reg_src1
= bits (arm_insn_r
->arm_insn
, 0, 3);
9845 reg_src2
= bits (arm_insn_r
->arm_insn
, 16, 19);
9846 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
9847 regcache_raw_read_unsigned (reg_cache
, reg_src2
, &u_regval
[1]);
9850 /* If R15 was used as Rn, hence current PC+8. */
9851 u_regval
[0] = u_regval
[0] + 8;
9853 /* Calculate target store address, Rn +/- Rm, register offset. */
9854 if (12 == arm_insn_r
->opcode
)
9856 tgt_mem_addr
= u_regval
[0] + u_regval
[1];
9860 tgt_mem_addr
= u_regval
[1] - u_regval
[0];
9862 if (ARM_RECORD_STRH
== str_type
)
9864 record_buf_mem
[0] = 2;
9865 record_buf_mem
[1] = tgt_mem_addr
;
9866 arm_insn_r
->mem_rec_count
= 1;
9868 else if (ARM_RECORD_STRD
== str_type
)
9870 record_buf_mem
[0] = 4;
9871 record_buf_mem
[1] = tgt_mem_addr
;
9872 record_buf_mem
[2] = 4;
9873 record_buf_mem
[3] = tgt_mem_addr
+ 4;
9874 arm_insn_r
->mem_rec_count
= 2;
9877 else if (11 == arm_insn_r
->opcode
|| 15 == arm_insn_r
->opcode
9878 || 2 == arm_insn_r
->opcode
|| 6 == arm_insn_r
->opcode
)
9880 /* 3) Store, immediate pre-indexed. */
9881 /* 5) Store, immediate post-indexed. */
9882 immed_low
= bits (arm_insn_r
->arm_insn
, 0, 3);
9883 immed_high
= bits (arm_insn_r
->arm_insn
, 8, 11);
9884 offset_8
= (immed_high
<< 4) | immed_low
;
9885 reg_src1
= bits (arm_insn_r
->arm_insn
, 16, 19);
9886 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
9887 /* Calculate target store address, Rn +/- Rm, register offset. */
9888 if (15 == arm_insn_r
->opcode
|| 6 == arm_insn_r
->opcode
)
9890 tgt_mem_addr
= u_regval
[0] + offset_8
;
9894 tgt_mem_addr
= u_regval
[0] - offset_8
;
9896 if (ARM_RECORD_STRH
== str_type
)
9898 record_buf_mem
[0] = 2;
9899 record_buf_mem
[1] = tgt_mem_addr
;
9900 arm_insn_r
->mem_rec_count
= 1;
9902 else if (ARM_RECORD_STRD
== str_type
)
9904 record_buf_mem
[0] = 4;
9905 record_buf_mem
[1] = tgt_mem_addr
;
9906 record_buf_mem
[2] = 4;
9907 record_buf_mem
[3] = tgt_mem_addr
+ 4;
9908 arm_insn_r
->mem_rec_count
= 2;
9910 /* Record Rn also as it changes. */
9911 *(record_buf
) = bits (arm_insn_r
->arm_insn
, 16, 19);
9912 arm_insn_r
->reg_rec_count
= 1;
9914 else if (9 == arm_insn_r
->opcode
|| 13 == arm_insn_r
->opcode
9915 || 0 == arm_insn_r
->opcode
|| 4 == arm_insn_r
->opcode
)
9917 /* 4) Store, register pre-indexed. */
9918 /* 6) Store, register post -indexed. */
9919 reg_src1
= bits (arm_insn_r
->arm_insn
, 0, 3);
9920 reg_src2
= bits (arm_insn_r
->arm_insn
, 16, 19);
9921 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
9922 regcache_raw_read_unsigned (reg_cache
, reg_src2
, &u_regval
[1]);
9923 /* Calculate target store address, Rn +/- Rm, register offset. */
9924 if (13 == arm_insn_r
->opcode
|| 4 == arm_insn_r
->opcode
)
9926 tgt_mem_addr
= u_regval
[0] + u_regval
[1];
9930 tgt_mem_addr
= u_regval
[1] - u_regval
[0];
9932 if (ARM_RECORD_STRH
== str_type
)
9934 record_buf_mem
[0] = 2;
9935 record_buf_mem
[1] = tgt_mem_addr
;
9936 arm_insn_r
->mem_rec_count
= 1;
9938 else if (ARM_RECORD_STRD
== str_type
)
9940 record_buf_mem
[0] = 4;
9941 record_buf_mem
[1] = tgt_mem_addr
;
9942 record_buf_mem
[2] = 4;
9943 record_buf_mem
[3] = tgt_mem_addr
+ 4;
9944 arm_insn_r
->mem_rec_count
= 2;
9946 /* Record Rn also as it changes. */
9947 *(record_buf
) = bits (arm_insn_r
->arm_insn
, 16, 19);
9948 arm_insn_r
->reg_rec_count
= 1;
9953 /* Handling ARM extension space insns. */
9956 arm_record_extension_space (insn_decode_record
*arm_insn_r
)
9958 int ret
= 0; /* Return value: -1:record failure ; 0:success */
9959 uint32_t opcode1
= 0, opcode2
= 0, insn_op1
= 0;
9960 uint32_t record_buf
[8], record_buf_mem
[8];
9961 uint32_t reg_src1
= 0;
9962 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
9963 ULONGEST u_regval
= 0;
9965 gdb_assert (!INSN_RECORDED(arm_insn_r
));
9966 /* Handle unconditional insn extension space. */
9968 opcode1
= bits (arm_insn_r
->arm_insn
, 20, 27);
9969 opcode2
= bits (arm_insn_r
->arm_insn
, 4, 7);
9970 if (arm_insn_r
->cond
)
9972 /* PLD has no affect on architectural state, it just affects
9974 if (5 == ((opcode1
& 0xE0) >> 5))
9977 record_buf
[0] = ARM_PS_REGNUM
;
9978 record_buf
[1] = ARM_LR_REGNUM
;
9979 arm_insn_r
->reg_rec_count
= 2;
9981 /* STC2, LDC2, MCR2, MRC2, CDP2: <TBD>, co-processor insn. */
9985 opcode1
= bits (arm_insn_r
->arm_insn
, 25, 27);
9986 if (3 == opcode1
&& bit (arm_insn_r
->arm_insn
, 4))
9989 /* Undefined instruction on ARM V5; need to handle if later
9990 versions define it. */
9993 opcode1
= bits (arm_insn_r
->arm_insn
, 24, 27);
9994 opcode2
= bits (arm_insn_r
->arm_insn
, 4, 7);
9995 insn_op1
= bits (arm_insn_r
->arm_insn
, 20, 23);
9997 /* Handle arithmetic insn extension space. */
9998 if (!opcode1
&& 9 == opcode2
&& 1 != arm_insn_r
->cond
9999 && !INSN_RECORDED(arm_insn_r
))
10001 /* Handle MLA(S) and MUL(S). */
10002 if (in_inclusive_range (insn_op1
, 0U, 3U))
10004 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10005 record_buf
[1] = ARM_PS_REGNUM
;
10006 arm_insn_r
->reg_rec_count
= 2;
10008 else if (in_inclusive_range (insn_op1
, 4U, 15U))
10010 /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */
10011 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 16, 19);
10012 record_buf
[1] = bits (arm_insn_r
->arm_insn
, 12, 15);
10013 record_buf
[2] = ARM_PS_REGNUM
;
10014 arm_insn_r
->reg_rec_count
= 3;
10018 opcode1
= bits (arm_insn_r
->arm_insn
, 26, 27);
10019 opcode2
= bits (arm_insn_r
->arm_insn
, 23, 24);
10020 insn_op1
= bits (arm_insn_r
->arm_insn
, 21, 22);
10022 /* Handle control insn extension space. */
10024 if (!opcode1
&& 2 == opcode2
&& !bit (arm_insn_r
->arm_insn
, 20)
10025 && 1 != arm_insn_r
->cond
&& !INSN_RECORDED(arm_insn_r
))
10027 if (!bit (arm_insn_r
->arm_insn
,25))
10029 if (!bits (arm_insn_r
->arm_insn
, 4, 7))
10031 if ((0 == insn_op1
) || (2 == insn_op1
))
10034 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10035 arm_insn_r
->reg_rec_count
= 1;
10037 else if (1 == insn_op1
)
10039 /* CSPR is going to be changed. */
10040 record_buf
[0] = ARM_PS_REGNUM
;
10041 arm_insn_r
->reg_rec_count
= 1;
10043 else if (3 == insn_op1
)
10045 /* SPSR is going to be changed. */
10046 /* We need to get SPSR value, which is yet to be done. */
10050 else if (1 == bits (arm_insn_r
->arm_insn
, 4, 7))
10055 record_buf
[0] = ARM_PS_REGNUM
;
10056 arm_insn_r
->reg_rec_count
= 1;
10058 else if (3 == insn_op1
)
10061 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10062 arm_insn_r
->reg_rec_count
= 1;
10065 else if (3 == bits (arm_insn_r
->arm_insn
, 4, 7))
10068 record_buf
[0] = ARM_PS_REGNUM
;
10069 record_buf
[1] = ARM_LR_REGNUM
;
10070 arm_insn_r
->reg_rec_count
= 2;
10072 else if (5 == bits (arm_insn_r
->arm_insn
, 4, 7))
10074 /* QADD, QSUB, QDADD, QDSUB */
10075 record_buf
[0] = ARM_PS_REGNUM
;
10076 record_buf
[1] = bits (arm_insn_r
->arm_insn
, 12, 15);
10077 arm_insn_r
->reg_rec_count
= 2;
10079 else if (7 == bits (arm_insn_r
->arm_insn
, 4, 7))
10082 record_buf
[0] = ARM_PS_REGNUM
;
10083 record_buf
[1] = ARM_LR_REGNUM
;
10084 arm_insn_r
->reg_rec_count
= 2;
10086 /* Save SPSR also;how? */
10089 else if(8 == bits (arm_insn_r
->arm_insn
, 4, 7)
10090 || 10 == bits (arm_insn_r
->arm_insn
, 4, 7)
10091 || 12 == bits (arm_insn_r
->arm_insn
, 4, 7)
10092 || 14 == bits (arm_insn_r
->arm_insn
, 4, 7)
10095 if (0 == insn_op1
|| 1 == insn_op1
)
10097 /* SMLA<x><y>, SMLAW<y>, SMULW<y>. */
10098 /* We dont do optimization for SMULW<y> where we
10100 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10101 record_buf
[1] = ARM_PS_REGNUM
;
10102 arm_insn_r
->reg_rec_count
= 2;
10104 else if (2 == insn_op1
)
10107 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10108 record_buf
[1] = bits (arm_insn_r
->arm_insn
, 16, 19);
10109 arm_insn_r
->reg_rec_count
= 2;
10111 else if (3 == insn_op1
)
10114 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10115 arm_insn_r
->reg_rec_count
= 1;
10121 /* MSR : immediate form. */
10124 /* CSPR is going to be changed. */
10125 record_buf
[0] = ARM_PS_REGNUM
;
10126 arm_insn_r
->reg_rec_count
= 1;
10128 else if (3 == insn_op1
)
10130 /* SPSR is going to be changed. */
10131 /* we need to get SPSR value, which is yet to be done */
10137 opcode1
= bits (arm_insn_r
->arm_insn
, 25, 27);
10138 opcode2
= bits (arm_insn_r
->arm_insn
, 20, 24);
10139 insn_op1
= bits (arm_insn_r
->arm_insn
, 5, 6);
10141 /* Handle load/store insn extension space. */
10143 if (!opcode1
&& bit (arm_insn_r
->arm_insn
, 7)
10144 && bit (arm_insn_r
->arm_insn
, 4) && 1 != arm_insn_r
->cond
10145 && !INSN_RECORDED(arm_insn_r
))
10150 /* These insn, changes register and memory as well. */
10151 /* SWP or SWPB insn. */
10152 /* Get memory address given by Rn. */
10153 reg_src1
= bits (arm_insn_r
->arm_insn
, 16, 19);
10154 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
);
10155 /* SWP insn ?, swaps word. */
10156 if (8 == arm_insn_r
->opcode
)
10158 record_buf_mem
[0] = 4;
10162 /* SWPB insn, swaps only byte. */
10163 record_buf_mem
[0] = 1;
10165 record_buf_mem
[1] = u_regval
;
10166 arm_insn_r
->mem_rec_count
= 1;
10167 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10168 arm_insn_r
->reg_rec_count
= 1;
10170 else if (1 == insn_op1
&& !bit (arm_insn_r
->arm_insn
, 20))
10173 arm_record_strx(arm_insn_r
, &record_buf
[0], &record_buf_mem
[0],
10176 else if (2 == insn_op1
&& !bit (arm_insn_r
->arm_insn
, 20))
10179 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10180 record_buf
[1] = record_buf
[0] + 1;
10181 arm_insn_r
->reg_rec_count
= 2;
10183 else if (3 == insn_op1
&& !bit (arm_insn_r
->arm_insn
, 20))
10186 arm_record_strx(arm_insn_r
, &record_buf
[0], &record_buf_mem
[0],
10189 else if (bit (arm_insn_r
->arm_insn
, 20) && insn_op1
<= 3)
10191 /* LDRH, LDRSB, LDRSH. */
10192 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10193 arm_insn_r
->reg_rec_count
= 1;
10198 opcode1
= bits (arm_insn_r
->arm_insn
, 23, 27);
10199 if (24 == opcode1
&& bit (arm_insn_r
->arm_insn
, 21)
10200 && !INSN_RECORDED(arm_insn_r
))
10203 /* Handle coprocessor insn extension space. */
10206 /* To be done for ARMv5 and later; as of now we return -1. */
10210 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10211 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
10216 /* Handling opcode 000 insns. */
10219 arm_record_data_proc_misc_ld_str (insn_decode_record
*arm_insn_r
)
10221 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
10222 uint32_t record_buf
[8], record_buf_mem
[8];
10223 ULONGEST u_regval
[2] = {0};
10225 uint32_t reg_src1
= 0, reg_dest
= 0;
10226 uint32_t opcode1
= 0;
10228 arm_insn_r
->opcode
= bits (arm_insn_r
->arm_insn
, 21, 24);
10229 arm_insn_r
->decode
= bits (arm_insn_r
->arm_insn
, 4, 7);
10230 opcode1
= bits (arm_insn_r
->arm_insn
, 20, 24);
10232 if (!((opcode1
& 0x19) == 0x10))
10234 /* Data-processing (register) and Data-processing (register-shifted
10236 /* Out of 11 shifter operands mode, all the insn modifies destination
10237 register, which is specified by 13-16 decode. */
10238 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10239 record_buf
[1] = ARM_PS_REGNUM
;
10240 arm_insn_r
->reg_rec_count
= 2;
10242 else if ((arm_insn_r
->decode
< 8) && ((opcode1
& 0x19) == 0x10))
10244 /* Miscellaneous instructions */
10246 if (3 == arm_insn_r
->decode
&& 0x12 == opcode1
10247 && sbo_sbz (arm_insn_r
->arm_insn
, 9, 12, 1))
10249 /* Handle BLX, branch and link/exchange. */
10250 if (9 == arm_insn_r
->opcode
)
10252 /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm,
10253 and R14 stores the return address. */
10254 record_buf
[0] = ARM_PS_REGNUM
;
10255 record_buf
[1] = ARM_LR_REGNUM
;
10256 arm_insn_r
->reg_rec_count
= 2;
10259 else if (7 == arm_insn_r
->decode
&& 0x12 == opcode1
)
10261 /* Handle enhanced software breakpoint insn, BKPT. */
10262 /* CPSR is changed to be executed in ARM state, disabling normal
10263 interrupts, entering abort mode. */
10264 /* According to high vector configuration PC is set. */
10265 /* user hit breakpoint and type reverse, in
10266 that case, we need to go back with previous CPSR and
10267 Program Counter. */
10268 record_buf
[0] = ARM_PS_REGNUM
;
10269 record_buf
[1] = ARM_LR_REGNUM
;
10270 arm_insn_r
->reg_rec_count
= 2;
10272 /* Save SPSR also; how? */
10275 else if (1 == arm_insn_r
->decode
&& 0x12 == opcode1
10276 && sbo_sbz (arm_insn_r
->arm_insn
, 9, 12, 1))
10278 /* Handle BX, branch and link/exchange. */
10279 /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm. */
10280 record_buf
[0] = ARM_PS_REGNUM
;
10281 arm_insn_r
->reg_rec_count
= 1;
10283 else if (1 == arm_insn_r
->decode
&& 0x16 == opcode1
10284 && sbo_sbz (arm_insn_r
->arm_insn
, 9, 4, 1)
10285 && sbo_sbz (arm_insn_r
->arm_insn
, 17, 4, 1))
10287 /* Count leading zeros: CLZ. */
10288 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10289 arm_insn_r
->reg_rec_count
= 1;
10291 else if (!bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
)
10292 && (8 == arm_insn_r
->opcode
|| 10 == arm_insn_r
->opcode
)
10293 && sbo_sbz (arm_insn_r
->arm_insn
, 17, 4, 1)
10294 && sbo_sbz (arm_insn_r
->arm_insn
, 1, 12, 0))
10296 /* Handle MRS insn. */
10297 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10298 arm_insn_r
->reg_rec_count
= 1;
10301 else if (9 == arm_insn_r
->decode
&& opcode1
< 0x10)
10303 /* Multiply and multiply-accumulate */
10305 /* Handle multiply instructions. */
10306 /* MLA, MUL, SMLAL, SMULL, UMLAL, UMULL. */
10307 if (0 == arm_insn_r
->opcode
|| 1 == arm_insn_r
->opcode
)
10309 /* Handle MLA and MUL. */
10310 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 16, 19);
10311 record_buf
[1] = ARM_PS_REGNUM
;
10312 arm_insn_r
->reg_rec_count
= 2;
10314 else if (4 <= arm_insn_r
->opcode
&& 7 >= arm_insn_r
->opcode
)
10316 /* Handle SMLAL, SMULL, UMLAL, UMULL. */
10317 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 16, 19);
10318 record_buf
[1] = bits (arm_insn_r
->arm_insn
, 12, 15);
10319 record_buf
[2] = ARM_PS_REGNUM
;
10320 arm_insn_r
->reg_rec_count
= 3;
10323 else if (9 == arm_insn_r
->decode
&& opcode1
> 0x10)
10325 /* Synchronization primitives */
10327 /* Handling SWP, SWPB. */
10328 /* These insn, changes register and memory as well. */
10329 /* SWP or SWPB insn. */
10331 reg_src1
= bits (arm_insn_r
->arm_insn
, 16, 19);
10332 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
10333 /* SWP insn ?, swaps word. */
10334 if (8 == arm_insn_r
->opcode
)
10336 record_buf_mem
[0] = 4;
10340 /* SWPB insn, swaps only byte. */
10341 record_buf_mem
[0] = 1;
10343 record_buf_mem
[1] = u_regval
[0];
10344 arm_insn_r
->mem_rec_count
= 1;
10345 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10346 arm_insn_r
->reg_rec_count
= 1;
10348 else if (11 == arm_insn_r
->decode
|| 13 == arm_insn_r
->decode
10349 || 15 == arm_insn_r
->decode
)
10351 if ((opcode1
& 0x12) == 2)
10353 /* Extra load/store (unprivileged) */
10358 /* Extra load/store */
10359 switch (bits (arm_insn_r
->arm_insn
, 5, 6))
10362 if ((opcode1
& 0x05) == 0x0 || (opcode1
& 0x05) == 0x4)
10364 /* STRH (register), STRH (immediate) */
10365 arm_record_strx (arm_insn_r
, &record_buf
[0],
10366 &record_buf_mem
[0], ARM_RECORD_STRH
);
10368 else if ((opcode1
& 0x05) == 0x1)
10370 /* LDRH (register) */
10371 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10372 arm_insn_r
->reg_rec_count
= 1;
10374 if (bit (arm_insn_r
->arm_insn
, 21))
10376 /* Write back to Rn. */
10377 record_buf
[arm_insn_r
->reg_rec_count
++]
10378 = bits (arm_insn_r
->arm_insn
, 16, 19);
10381 else if ((opcode1
& 0x05) == 0x5)
10383 /* LDRH (immediate), LDRH (literal) */
10384 int rn
= bits (arm_insn_r
->arm_insn
, 16, 19);
10386 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10387 arm_insn_r
->reg_rec_count
= 1;
10391 /*LDRH (immediate) */
10392 if (bit (arm_insn_r
->arm_insn
, 21))
10394 /* Write back to Rn. */
10395 record_buf
[arm_insn_r
->reg_rec_count
++] = rn
;
10403 if ((opcode1
& 0x05) == 0x0)
10405 /* LDRD (register) */
10406 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10407 record_buf
[1] = record_buf
[0] + 1;
10408 arm_insn_r
->reg_rec_count
= 2;
10410 if (bit (arm_insn_r
->arm_insn
, 21))
10412 /* Write back to Rn. */
10413 record_buf
[arm_insn_r
->reg_rec_count
++]
10414 = bits (arm_insn_r
->arm_insn
, 16, 19);
10417 else if ((opcode1
& 0x05) == 0x1)
10419 /* LDRSB (register) */
10420 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10421 arm_insn_r
->reg_rec_count
= 1;
10423 if (bit (arm_insn_r
->arm_insn
, 21))
10425 /* Write back to Rn. */
10426 record_buf
[arm_insn_r
->reg_rec_count
++]
10427 = bits (arm_insn_r
->arm_insn
, 16, 19);
10430 else if ((opcode1
& 0x05) == 0x4 || (opcode1
& 0x05) == 0x5)
10432 /* LDRD (immediate), LDRD (literal), LDRSB (immediate),
10434 int rn
= bits (arm_insn_r
->arm_insn
, 16, 19);
10436 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10437 arm_insn_r
->reg_rec_count
= 1;
10441 /*LDRD (immediate), LDRSB (immediate) */
10442 if (bit (arm_insn_r
->arm_insn
, 21))
10444 /* Write back to Rn. */
10445 record_buf
[arm_insn_r
->reg_rec_count
++] = rn
;
10453 if ((opcode1
& 0x05) == 0x0)
10455 /* STRD (register) */
10456 arm_record_strx (arm_insn_r
, &record_buf
[0],
10457 &record_buf_mem
[0], ARM_RECORD_STRD
);
10459 else if ((opcode1
& 0x05) == 0x1)
10461 /* LDRSH (register) */
10462 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10463 arm_insn_r
->reg_rec_count
= 1;
10465 if (bit (arm_insn_r
->arm_insn
, 21))
10467 /* Write back to Rn. */
10468 record_buf
[arm_insn_r
->reg_rec_count
++]
10469 = bits (arm_insn_r
->arm_insn
, 16, 19);
10472 else if ((opcode1
& 0x05) == 0x4)
10474 /* STRD (immediate) */
10475 arm_record_strx (arm_insn_r
, &record_buf
[0],
10476 &record_buf_mem
[0], ARM_RECORD_STRD
);
10478 else if ((opcode1
& 0x05) == 0x5)
10480 /* LDRSH (immediate), LDRSH (literal) */
10481 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10482 arm_insn_r
->reg_rec_count
= 1;
10484 if (bit (arm_insn_r
->arm_insn
, 21))
10486 /* Write back to Rn. */
10487 record_buf
[arm_insn_r
->reg_rec_count
++]
10488 = bits (arm_insn_r
->arm_insn
, 16, 19);
10504 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10505 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
10509 /* Handling opcode 001 insns. */
10512 arm_record_data_proc_imm (insn_decode_record
*arm_insn_r
)
10514 uint32_t record_buf
[8], record_buf_mem
[8];
10516 arm_insn_r
->opcode
= bits (arm_insn_r
->arm_insn
, 21, 24);
10517 arm_insn_r
->decode
= bits (arm_insn_r
->arm_insn
, 4, 7);
10519 if ((9 == arm_insn_r
->opcode
|| 11 == arm_insn_r
->opcode
)
10520 && 2 == bits (arm_insn_r
->arm_insn
, 20, 21)
10521 && sbo_sbz (arm_insn_r
->arm_insn
, 13, 4, 1)
10524 /* Handle MSR insn. */
10525 if (9 == arm_insn_r
->opcode
)
10527 /* CSPR is going to be changed. */
10528 record_buf
[0] = ARM_PS_REGNUM
;
10529 arm_insn_r
->reg_rec_count
= 1;
10533 /* SPSR is going to be changed. */
10536 else if (arm_insn_r
->opcode
<= 15)
10538 /* Normal data processing insns. */
10539 /* Out of 11 shifter operands mode, all the insn modifies destination
10540 register, which is specified by 13-16 decode. */
10541 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10542 record_buf
[1] = ARM_PS_REGNUM
;
10543 arm_insn_r
->reg_rec_count
= 2;
10550 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10551 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
10556 arm_record_media (insn_decode_record
*arm_insn_r
)
10558 uint32_t record_buf
[8];
10560 switch (bits (arm_insn_r
->arm_insn
, 22, 24))
10563 /* Parallel addition and subtraction, signed */
10565 /* Parallel addition and subtraction, unsigned */
10568 /* Packing, unpacking, saturation and reversal */
10570 int rd
= bits (arm_insn_r
->arm_insn
, 12, 15);
10572 record_buf
[arm_insn_r
->reg_rec_count
++] = rd
;
10578 /* Signed multiplies */
10580 int rd
= bits (arm_insn_r
->arm_insn
, 16, 19);
10581 unsigned int op1
= bits (arm_insn_r
->arm_insn
, 20, 22);
10583 record_buf
[arm_insn_r
->reg_rec_count
++] = rd
;
10585 record_buf
[arm_insn_r
->reg_rec_count
++] = ARM_PS_REGNUM
;
10586 else if (op1
== 0x4)
10587 record_buf
[arm_insn_r
->reg_rec_count
++]
10588 = bits (arm_insn_r
->arm_insn
, 12, 15);
10594 if (bit (arm_insn_r
->arm_insn
, 21)
10595 && bits (arm_insn_r
->arm_insn
, 5, 6) == 0x2)
10598 record_buf
[arm_insn_r
->reg_rec_count
++]
10599 = bits (arm_insn_r
->arm_insn
, 12, 15);
10601 else if (bits (arm_insn_r
->arm_insn
, 20, 21) == 0x0
10602 && bits (arm_insn_r
->arm_insn
, 5, 7) == 0x0)
10604 /* USAD8 and USADA8 */
10605 record_buf
[arm_insn_r
->reg_rec_count
++]
10606 = bits (arm_insn_r
->arm_insn
, 16, 19);
10613 if (bits (arm_insn_r
->arm_insn
, 20, 21) == 0x3
10614 && bits (arm_insn_r
->arm_insn
, 5, 7) == 0x7)
10616 /* Permanently UNDEFINED */
10621 /* BFC, BFI and UBFX */
10622 record_buf
[arm_insn_r
->reg_rec_count
++]
10623 = bits (arm_insn_r
->arm_insn
, 12, 15);
10632 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10637 /* Handle ARM mode instructions with opcode 010. */
10640 arm_record_ld_st_imm_offset (insn_decode_record
*arm_insn_r
)
10642 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
10644 uint32_t reg_base
, reg_dest
;
10645 uint32_t offset_12
, tgt_mem_addr
;
10646 uint32_t record_buf
[8], record_buf_mem
[8];
10647 unsigned char wback
;
10650 /* Calculate wback. */
10651 wback
= (bit (arm_insn_r
->arm_insn
, 24) == 0)
10652 || (bit (arm_insn_r
->arm_insn
, 21) == 1);
10654 arm_insn_r
->reg_rec_count
= 0;
10655 reg_base
= bits (arm_insn_r
->arm_insn
, 16, 19);
10657 if (bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
10659 /* LDR (immediate), LDR (literal), LDRB (immediate), LDRB (literal), LDRBT
10662 reg_dest
= bits (arm_insn_r
->arm_insn
, 12, 15);
10663 record_buf
[arm_insn_r
->reg_rec_count
++] = reg_dest
;
10665 /* The LDR instruction is capable of doing branching. If MOV LR, PC
10666 preceeds a LDR instruction having R15 as reg_base, it
10667 emulates a branch and link instruction, and hence we need to save
10668 CPSR and PC as well. */
10669 if (ARM_PC_REGNUM
== reg_dest
)
10670 record_buf
[arm_insn_r
->reg_rec_count
++] = ARM_PS_REGNUM
;
10672 /* If wback is true, also save the base register, which is going to be
10675 record_buf
[arm_insn_r
->reg_rec_count
++] = reg_base
;
10679 /* STR (immediate), STRB (immediate), STRBT and STRT. */
10681 offset_12
= bits (arm_insn_r
->arm_insn
, 0, 11);
10682 regcache_raw_read_unsigned (reg_cache
, reg_base
, &u_regval
);
10684 /* Handle bit U. */
10685 if (bit (arm_insn_r
->arm_insn
, 23))
10687 /* U == 1: Add the offset. */
10688 tgt_mem_addr
= (uint32_t) u_regval
+ offset_12
;
10692 /* U == 0: subtract the offset. */
10693 tgt_mem_addr
= (uint32_t) u_regval
- offset_12
;
10696 /* Bit 22 tells us whether the store instruction writes 1 byte or 4
10698 if (bit (arm_insn_r
->arm_insn
, 22))
10700 /* STRB and STRBT: 1 byte. */
10701 record_buf_mem
[0] = 1;
10705 /* STR and STRT: 4 bytes. */
10706 record_buf_mem
[0] = 4;
10709 /* Handle bit P. */
10710 if (bit (arm_insn_r
->arm_insn
, 24))
10711 record_buf_mem
[1] = tgt_mem_addr
;
10713 record_buf_mem
[1] = (uint32_t) u_regval
;
10715 arm_insn_r
->mem_rec_count
= 1;
10717 /* If wback is true, also save the base register, which is going to be
10720 record_buf
[arm_insn_r
->reg_rec_count
++] = reg_base
;
10723 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10724 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
10728 /* Handling opcode 011 insns. */
10731 arm_record_ld_st_reg_offset (insn_decode_record
*arm_insn_r
)
10733 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
10735 uint32_t shift_imm
= 0;
10736 uint32_t reg_src1
= 0, reg_src2
= 0, reg_dest
= 0;
10737 uint32_t offset_12
= 0, tgt_mem_addr
= 0;
10738 uint32_t record_buf
[8], record_buf_mem
[8];
10741 ULONGEST u_regval
[2];
10743 if (bit (arm_insn_r
->arm_insn
, 4))
10744 return arm_record_media (arm_insn_r
);
10746 arm_insn_r
->opcode
= bits (arm_insn_r
->arm_insn
, 21, 24);
10747 arm_insn_r
->decode
= bits (arm_insn_r
->arm_insn
, 4, 7);
10749 /* Handle enhanced store insns and LDRD DSP insn,
10750 order begins according to addressing modes for store insns
10754 if (bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
10756 reg_dest
= bits (arm_insn_r
->arm_insn
, 12, 15);
10757 /* LDR insn has a capability to do branching, if
10758 MOV LR, PC is precedded by LDR insn having Rn as R15
10759 in that case, it emulates branch and link insn, and hence we
10760 need to save CSPR and PC as well. */
10761 if (15 != reg_dest
)
10763 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
10764 arm_insn_r
->reg_rec_count
= 1;
10768 record_buf
[0] = reg_dest
;
10769 record_buf
[1] = ARM_PS_REGNUM
;
10770 arm_insn_r
->reg_rec_count
= 2;
10775 if (! bits (arm_insn_r
->arm_insn
, 4, 11))
10777 /* Store insn, register offset and register pre-indexed,
10778 register post-indexed. */
10780 reg_src1
= bits (arm_insn_r
->arm_insn
, 0, 3);
10782 reg_src2
= bits (arm_insn_r
->arm_insn
, 16, 19);
10783 regcache_raw_read_unsigned (reg_cache
, reg_src1
10785 regcache_raw_read_unsigned (reg_cache
, reg_src2
10787 if (15 == reg_src2
)
10789 /* If R15 was used as Rn, hence current PC+8. */
10790 /* Pre-indexed mode doesnt reach here ; illegal insn. */
10791 u_regval
[0] = u_regval
[0] + 8;
10793 /* Calculate target store address, Rn +/- Rm, register offset. */
10795 if (bit (arm_insn_r
->arm_insn
, 23))
10797 tgt_mem_addr
= u_regval
[0] + u_regval
[1];
10801 tgt_mem_addr
= u_regval
[1] - u_regval
[0];
10804 switch (arm_insn_r
->opcode
)
10818 record_buf_mem
[0] = 4;
10833 record_buf_mem
[0] = 1;
10837 gdb_assert_not_reached ("no decoding pattern found");
10840 record_buf_mem
[1] = tgt_mem_addr
;
10841 arm_insn_r
->mem_rec_count
= 1;
10843 if (9 == arm_insn_r
->opcode
|| 11 == arm_insn_r
->opcode
10844 || 13 == arm_insn_r
->opcode
|| 15 == arm_insn_r
->opcode
10845 || 0 == arm_insn_r
->opcode
|| 2 == arm_insn_r
->opcode
10846 || 4 == arm_insn_r
->opcode
|| 6 == arm_insn_r
->opcode
10847 || 1 == arm_insn_r
->opcode
|| 3 == arm_insn_r
->opcode
10848 || 5 == arm_insn_r
->opcode
|| 7 == arm_insn_r
->opcode
10851 /* Rn is going to be changed in pre-indexed mode and
10852 post-indexed mode as well. */
10853 record_buf
[0] = reg_src2
;
10854 arm_insn_r
->reg_rec_count
= 1;
10859 /* Store insn, scaled register offset; scaled pre-indexed. */
10860 offset_12
= bits (arm_insn_r
->arm_insn
, 5, 6);
10862 reg_src1
= bits (arm_insn_r
->arm_insn
, 0, 3);
10864 reg_src2
= bits (arm_insn_r
->arm_insn
, 16, 19);
10865 /* Get shift_imm. */
10866 shift_imm
= bits (arm_insn_r
->arm_insn
, 7, 11);
10867 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
10868 regcache_raw_read_signed (reg_cache
, reg_src1
, &s_word
);
10869 regcache_raw_read_unsigned (reg_cache
, reg_src2
, &u_regval
[1]);
10870 /* Offset_12 used as shift. */
10874 /* Offset_12 used as index. */
10875 offset_12
= u_regval
[0] << shift_imm
;
10879 offset_12
= (!shift_imm
)?0:u_regval
[0] >> shift_imm
;
10885 if (bit (u_regval
[0], 31))
10887 offset_12
= 0xFFFFFFFF;
10896 /* This is arithmetic shift. */
10897 offset_12
= s_word
>> shift_imm
;
10904 regcache_raw_read_unsigned (reg_cache
, ARM_PS_REGNUM
,
10906 /* Get C flag value and shift it by 31. */
10907 offset_12
= (((bit (u_regval
[1], 29)) << 31) \
10908 | (u_regval
[0]) >> 1);
10912 offset_12
= (u_regval
[0] >> shift_imm
) \
10914 (sizeof(uint32_t) - shift_imm
));
10919 gdb_assert_not_reached ("no decoding pattern found");
10923 regcache_raw_read_unsigned (reg_cache
, reg_src2
, &u_regval
[1]);
10925 if (bit (arm_insn_r
->arm_insn
, 23))
10927 tgt_mem_addr
= u_regval
[1] + offset_12
;
10931 tgt_mem_addr
= u_regval
[1] - offset_12
;
10934 switch (arm_insn_r
->opcode
)
10948 record_buf_mem
[0] = 4;
10963 record_buf_mem
[0] = 1;
10967 gdb_assert_not_reached ("no decoding pattern found");
10970 record_buf_mem
[1] = tgt_mem_addr
;
10971 arm_insn_r
->mem_rec_count
= 1;
10973 if (9 == arm_insn_r
->opcode
|| 11 == arm_insn_r
->opcode
10974 || 13 == arm_insn_r
->opcode
|| 15 == arm_insn_r
->opcode
10975 || 0 == arm_insn_r
->opcode
|| 2 == arm_insn_r
->opcode
10976 || 4 == arm_insn_r
->opcode
|| 6 == arm_insn_r
->opcode
10977 || 1 == arm_insn_r
->opcode
|| 3 == arm_insn_r
->opcode
10978 || 5 == arm_insn_r
->opcode
|| 7 == arm_insn_r
->opcode
10981 /* Rn is going to be changed in register scaled pre-indexed
10982 mode,and scaled post indexed mode. */
10983 record_buf
[0] = reg_src2
;
10984 arm_insn_r
->reg_rec_count
= 1;
10989 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
10990 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
10994 /* Handle ARM mode instructions with opcode 100. */
10997 arm_record_ld_st_multiple (insn_decode_record
*arm_insn_r
)
10999 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
11000 uint32_t register_count
= 0, register_bits
;
11001 uint32_t reg_base
, addr_mode
;
11002 uint32_t record_buf
[24], record_buf_mem
[48];
11006 /* Fetch the list of registers. */
11007 register_bits
= bits (arm_insn_r
->arm_insn
, 0, 15);
11008 arm_insn_r
->reg_rec_count
= 0;
11010 /* Fetch the base register that contains the address we are loading data
11012 reg_base
= bits (arm_insn_r
->arm_insn
, 16, 19);
11014 /* Calculate wback. */
11015 wback
= (bit (arm_insn_r
->arm_insn
, 21) == 1);
11017 if (bit (arm_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
11019 /* LDM/LDMIA/LDMFD, LDMDA/LDMFA, LDMDB and LDMIB. */
11021 /* Find out which registers are going to be loaded from memory. */
11022 while (register_bits
)
11024 if (register_bits
& 0x00000001)
11025 record_buf
[arm_insn_r
->reg_rec_count
++] = register_count
;
11026 register_bits
= register_bits
>> 1;
11031 /* If wback is true, also save the base register, which is going to be
11034 record_buf
[arm_insn_r
->reg_rec_count
++] = reg_base
;
11036 /* Save the CPSR register. */
11037 record_buf
[arm_insn_r
->reg_rec_count
++] = ARM_PS_REGNUM
;
11041 /* STM (STMIA, STMEA), STMDA (STMED), STMDB (STMFD) and STMIB (STMFA). */
11043 addr_mode
= bits (arm_insn_r
->arm_insn
, 23, 24);
11045 regcache_raw_read_unsigned (reg_cache
, reg_base
, &u_regval
);
11047 /* Find out how many registers are going to be stored to memory. */
11048 while (register_bits
)
11050 if (register_bits
& 0x00000001)
11052 register_bits
= register_bits
>> 1;
11057 /* STMDA (STMED): Decrement after. */
11059 record_buf_mem
[1] = (uint32_t) u_regval
11060 - register_count
* INT_REGISTER_SIZE
+ 4;
11062 /* STM (STMIA, STMEA): Increment after. */
11064 record_buf_mem
[1] = (uint32_t) u_regval
;
11066 /* STMDB (STMFD): Decrement before. */
11068 record_buf_mem
[1] = (uint32_t) u_regval
11069 - register_count
* INT_REGISTER_SIZE
;
11071 /* STMIB (STMFA): Increment before. */
11073 record_buf_mem
[1] = (uint32_t) u_regval
+ INT_REGISTER_SIZE
;
11076 gdb_assert_not_reached ("no decoding pattern found");
11080 record_buf_mem
[0] = register_count
* INT_REGISTER_SIZE
;
11081 arm_insn_r
->mem_rec_count
= 1;
11083 /* If wback is true, also save the base register, which is going to be
11086 record_buf
[arm_insn_r
->reg_rec_count
++] = reg_base
;
11089 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
11090 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
11094 /* Handling opcode 101 insns. */
11097 arm_record_b_bl (insn_decode_record
*arm_insn_r
)
11099 uint32_t record_buf
[8];
11101 /* Handle B, BL, BLX(1) insns. */
11102 /* B simply branches so we do nothing here. */
11103 /* Note: BLX(1) doesnt fall here but instead it falls into
11104 extension space. */
11105 if (bit (arm_insn_r
->arm_insn
, 24))
11107 record_buf
[0] = ARM_LR_REGNUM
;
11108 arm_insn_r
->reg_rec_count
= 1;
11111 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
11117 arm_record_unsupported_insn (insn_decode_record
*arm_insn_r
)
11119 printf_unfiltered (_("Process record does not support instruction "
11120 "0x%0x at address %s.\n"),arm_insn_r
->arm_insn
,
11121 paddress (arm_insn_r
->gdbarch
, arm_insn_r
->this_addr
));
11126 /* Record handler for vector data transfer instructions. */
11129 arm_record_vdata_transfer_insn (insn_decode_record
*arm_insn_r
)
11131 uint32_t bits_a
, bit_c
, bit_l
, reg_t
, reg_v
;
11132 uint32_t record_buf
[4];
11134 reg_t
= bits (arm_insn_r
->arm_insn
, 12, 15);
11135 reg_v
= bits (arm_insn_r
->arm_insn
, 21, 23);
11136 bits_a
= bits (arm_insn_r
->arm_insn
, 21, 23);
11137 bit_l
= bit (arm_insn_r
->arm_insn
, 20);
11138 bit_c
= bit (arm_insn_r
->arm_insn
, 8);
11140 /* Handle VMOV instruction. */
11141 if (bit_l
&& bit_c
)
11143 record_buf
[0] = reg_t
;
11144 arm_insn_r
->reg_rec_count
= 1;
11146 else if (bit_l
&& !bit_c
)
11148 /* Handle VMOV instruction. */
11149 if (bits_a
== 0x00)
11151 record_buf
[0] = reg_t
;
11152 arm_insn_r
->reg_rec_count
= 1;
11154 /* Handle VMRS instruction. */
11155 else if (bits_a
== 0x07)
11158 reg_t
= ARM_PS_REGNUM
;
11160 record_buf
[0] = reg_t
;
11161 arm_insn_r
->reg_rec_count
= 1;
11164 else if (!bit_l
&& !bit_c
)
11166 /* Handle VMOV instruction. */
11167 if (bits_a
== 0x00)
11169 record_buf
[0] = ARM_D0_REGNUM
+ reg_v
;
11171 arm_insn_r
->reg_rec_count
= 1;
11173 /* Handle VMSR instruction. */
11174 else if (bits_a
== 0x07)
11176 record_buf
[0] = ARM_FPSCR_REGNUM
;
11177 arm_insn_r
->reg_rec_count
= 1;
11180 else if (!bit_l
&& bit_c
)
11182 /* Handle VMOV instruction. */
11183 if (!(bits_a
& 0x04))
11185 record_buf
[0] = (reg_v
| (bit (arm_insn_r
->arm_insn
, 7) << 4))
11187 arm_insn_r
->reg_rec_count
= 1;
11189 /* Handle VDUP instruction. */
11192 if (bit (arm_insn_r
->arm_insn
, 21))
11194 reg_v
= reg_v
| (bit (arm_insn_r
->arm_insn
, 7) << 4);
11195 record_buf
[0] = reg_v
+ ARM_D0_REGNUM
;
11196 record_buf
[1] = reg_v
+ ARM_D0_REGNUM
+ 1;
11197 arm_insn_r
->reg_rec_count
= 2;
11201 reg_v
= reg_v
| (bit (arm_insn_r
->arm_insn
, 7) << 4);
11202 record_buf
[0] = reg_v
+ ARM_D0_REGNUM
;
11203 arm_insn_r
->reg_rec_count
= 1;
11208 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
11212 /* Record handler for extension register load/store instructions. */
11215 arm_record_exreg_ld_st_insn (insn_decode_record
*arm_insn_r
)
11217 uint32_t opcode
, single_reg
;
11218 uint8_t op_vldm_vstm
;
11219 uint32_t record_buf
[8], record_buf_mem
[128];
11220 ULONGEST u_regval
= 0;
11222 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
11224 opcode
= bits (arm_insn_r
->arm_insn
, 20, 24);
11225 single_reg
= !bit (arm_insn_r
->arm_insn
, 8);
11226 op_vldm_vstm
= opcode
& 0x1b;
11228 /* Handle VMOV instructions. */
11229 if ((opcode
& 0x1e) == 0x04)
11231 if (bit (arm_insn_r
->arm_insn
, 20)) /* to_arm_registers bit 20? */
11233 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
11234 record_buf
[1] = bits (arm_insn_r
->arm_insn
, 16, 19);
11235 arm_insn_r
->reg_rec_count
= 2;
11239 uint8_t reg_m
= bits (arm_insn_r
->arm_insn
, 0, 3);
11240 uint8_t bit_m
= bit (arm_insn_r
->arm_insn
, 5);
11244 /* The first S register number m is REG_M:M (M is bit 5),
11245 the corresponding D register number is REG_M:M / 2, which
11247 record_buf
[arm_insn_r
->reg_rec_count
++] = ARM_D0_REGNUM
+ reg_m
;
11248 /* The second S register number is REG_M:M + 1, the
11249 corresponding D register number is (REG_M:M + 1) / 2.
11250 IOW, if bit M is 1, the first and second S registers
11251 are mapped to different D registers, otherwise, they are
11252 in the same D register. */
11255 record_buf
[arm_insn_r
->reg_rec_count
++]
11256 = ARM_D0_REGNUM
+ reg_m
+ 1;
11261 record_buf
[0] = ((bit_m
<< 4) + reg_m
+ ARM_D0_REGNUM
);
11262 arm_insn_r
->reg_rec_count
= 1;
11266 /* Handle VSTM and VPUSH instructions. */
11267 else if (op_vldm_vstm
== 0x08 || op_vldm_vstm
== 0x0a
11268 || op_vldm_vstm
== 0x12)
11270 uint32_t start_address
, reg_rn
, imm_off32
, imm_off8
, memory_count
;
11271 uint32_t memory_index
= 0;
11273 reg_rn
= bits (arm_insn_r
->arm_insn
, 16, 19);
11274 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
);
11275 imm_off8
= bits (arm_insn_r
->arm_insn
, 0, 7);
11276 imm_off32
= imm_off8
<< 2;
11277 memory_count
= imm_off8
;
11279 if (bit (arm_insn_r
->arm_insn
, 23))
11280 start_address
= u_regval
;
11282 start_address
= u_regval
- imm_off32
;
11284 if (bit (arm_insn_r
->arm_insn
, 21))
11286 record_buf
[0] = reg_rn
;
11287 arm_insn_r
->reg_rec_count
= 1;
11290 while (memory_count
> 0)
11294 record_buf_mem
[memory_index
] = 4;
11295 record_buf_mem
[memory_index
+ 1] = start_address
;
11296 start_address
= start_address
+ 4;
11297 memory_index
= memory_index
+ 2;
11301 record_buf_mem
[memory_index
] = 4;
11302 record_buf_mem
[memory_index
+ 1] = start_address
;
11303 record_buf_mem
[memory_index
+ 2] = 4;
11304 record_buf_mem
[memory_index
+ 3] = start_address
+ 4;
11305 start_address
= start_address
+ 8;
11306 memory_index
= memory_index
+ 4;
11310 arm_insn_r
->mem_rec_count
= (memory_index
>> 1);
11312 /* Handle VLDM instructions. */
11313 else if (op_vldm_vstm
== 0x09 || op_vldm_vstm
== 0x0b
11314 || op_vldm_vstm
== 0x13)
11316 uint32_t reg_count
, reg_vd
;
11317 uint32_t reg_index
= 0;
11318 uint32_t bit_d
= bit (arm_insn_r
->arm_insn
, 22);
11320 reg_vd
= bits (arm_insn_r
->arm_insn
, 12, 15);
11321 reg_count
= bits (arm_insn_r
->arm_insn
, 0, 7);
11323 /* REG_VD is the first D register number. If the instruction
11324 loads memory to S registers (SINGLE_REG is TRUE), the register
11325 number is (REG_VD << 1 | bit D), so the corresponding D
11326 register number is (REG_VD << 1 | bit D) / 2 = REG_VD. */
11328 reg_vd
= reg_vd
| (bit_d
<< 4);
11330 if (bit (arm_insn_r
->arm_insn
, 21) /* write back */)
11331 record_buf
[reg_index
++] = bits (arm_insn_r
->arm_insn
, 16, 19);
11333 /* If the instruction loads memory to D register, REG_COUNT should
11334 be divided by 2, according to the ARM Architecture Reference
11335 Manual. If the instruction loads memory to S register, divide by
11336 2 as well because two S registers are mapped to D register. */
11337 reg_count
= reg_count
/ 2;
11338 if (single_reg
&& bit_d
)
11340 /* Increase the register count if S register list starts from
11341 an odd number (bit d is one). */
11345 while (reg_count
> 0)
11347 record_buf
[reg_index
++] = ARM_D0_REGNUM
+ reg_vd
+ reg_count
- 1;
11350 arm_insn_r
->reg_rec_count
= reg_index
;
11352 /* VSTR Vector store register. */
11353 else if ((opcode
& 0x13) == 0x10)
11355 uint32_t start_address
, reg_rn
, imm_off32
, imm_off8
;
11356 uint32_t memory_index
= 0;
11358 reg_rn
= bits (arm_insn_r
->arm_insn
, 16, 19);
11359 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
);
11360 imm_off8
= bits (arm_insn_r
->arm_insn
, 0, 7);
11361 imm_off32
= imm_off8
<< 2;
11363 if (bit (arm_insn_r
->arm_insn
, 23))
11364 start_address
= u_regval
+ imm_off32
;
11366 start_address
= u_regval
- imm_off32
;
11370 record_buf_mem
[memory_index
] = 4;
11371 record_buf_mem
[memory_index
+ 1] = start_address
;
11372 arm_insn_r
->mem_rec_count
= 1;
11376 record_buf_mem
[memory_index
] = 4;
11377 record_buf_mem
[memory_index
+ 1] = start_address
;
11378 record_buf_mem
[memory_index
+ 2] = 4;
11379 record_buf_mem
[memory_index
+ 3] = start_address
+ 4;
11380 arm_insn_r
->mem_rec_count
= 2;
11383 /* VLDR Vector load register. */
11384 else if ((opcode
& 0x13) == 0x11)
11386 uint32_t reg_vd
= bits (arm_insn_r
->arm_insn
, 12, 15);
11390 reg_vd
= reg_vd
| (bit (arm_insn_r
->arm_insn
, 22) << 4);
11391 record_buf
[0] = ARM_D0_REGNUM
+ reg_vd
;
11395 reg_vd
= (reg_vd
<< 1) | bit (arm_insn_r
->arm_insn
, 22);
11396 /* Record register D rather than pseudo register S. */
11397 record_buf
[0] = ARM_D0_REGNUM
+ reg_vd
/ 2;
11399 arm_insn_r
->reg_rec_count
= 1;
11402 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
11403 MEM_ALLOC (arm_insn_r
->arm_mems
, arm_insn_r
->mem_rec_count
, record_buf_mem
);
11407 /* Record handler for arm/thumb mode VFP data processing instructions. */
11410 arm_record_vfp_data_proc_insn (insn_decode_record
*arm_insn_r
)
11412 uint32_t opc1
, opc2
, opc3
, dp_op_sz
, bit_d
, reg_vd
;
11413 uint32_t record_buf
[4];
11414 enum insn_types
{INSN_T0
, INSN_T1
, INSN_T2
, INSN_T3
, INSN_INV
};
11415 enum insn_types curr_insn_type
= INSN_INV
;
11417 reg_vd
= bits (arm_insn_r
->arm_insn
, 12, 15);
11418 opc1
= bits (arm_insn_r
->arm_insn
, 20, 23);
11419 opc2
= bits (arm_insn_r
->arm_insn
, 16, 19);
11420 opc3
= bits (arm_insn_r
->arm_insn
, 6, 7);
11421 dp_op_sz
= bit (arm_insn_r
->arm_insn
, 8);
11422 bit_d
= bit (arm_insn_r
->arm_insn
, 22);
11423 opc1
= opc1
& 0x04;
11425 /* Handle VMLA, VMLS. */
11428 if (bit (arm_insn_r
->arm_insn
, 10))
11430 if (bit (arm_insn_r
->arm_insn
, 6))
11431 curr_insn_type
= INSN_T0
;
11433 curr_insn_type
= INSN_T1
;
11438 curr_insn_type
= INSN_T1
;
11440 curr_insn_type
= INSN_T2
;
11443 /* Handle VNMLA, VNMLS, VNMUL. */
11444 else if (opc1
== 0x01)
11447 curr_insn_type
= INSN_T1
;
11449 curr_insn_type
= INSN_T2
;
11452 else if (opc1
== 0x02 && !(opc3
& 0x01))
11454 if (bit (arm_insn_r
->arm_insn
, 10))
11456 if (bit (arm_insn_r
->arm_insn
, 6))
11457 curr_insn_type
= INSN_T0
;
11459 curr_insn_type
= INSN_T1
;
11464 curr_insn_type
= INSN_T1
;
11466 curr_insn_type
= INSN_T2
;
11469 /* Handle VADD, VSUB. */
11470 else if (opc1
== 0x03)
11472 if (!bit (arm_insn_r
->arm_insn
, 9))
11474 if (bit (arm_insn_r
->arm_insn
, 6))
11475 curr_insn_type
= INSN_T0
;
11477 curr_insn_type
= INSN_T1
;
11482 curr_insn_type
= INSN_T1
;
11484 curr_insn_type
= INSN_T2
;
11488 else if (opc1
== 0x0b)
11491 curr_insn_type
= INSN_T1
;
11493 curr_insn_type
= INSN_T2
;
11495 /* Handle all other vfp data processing instructions. */
11496 else if (opc1
== 0x0b)
11499 if (!(opc3
& 0x01) || (opc2
== 0x00 && opc3
== 0x01))
11501 if (bit (arm_insn_r
->arm_insn
, 4))
11503 if (bit (arm_insn_r
->arm_insn
, 6))
11504 curr_insn_type
= INSN_T0
;
11506 curr_insn_type
= INSN_T1
;
11511 curr_insn_type
= INSN_T1
;
11513 curr_insn_type
= INSN_T2
;
11516 /* Handle VNEG and VABS. */
11517 else if ((opc2
== 0x01 && opc3
== 0x01)
11518 || (opc2
== 0x00 && opc3
== 0x03))
11520 if (!bit (arm_insn_r
->arm_insn
, 11))
11522 if (bit (arm_insn_r
->arm_insn
, 6))
11523 curr_insn_type
= INSN_T0
;
11525 curr_insn_type
= INSN_T1
;
11530 curr_insn_type
= INSN_T1
;
11532 curr_insn_type
= INSN_T2
;
11535 /* Handle VSQRT. */
11536 else if (opc2
== 0x01 && opc3
== 0x03)
11539 curr_insn_type
= INSN_T1
;
11541 curr_insn_type
= INSN_T2
;
11544 else if (opc2
== 0x07 && opc3
== 0x03)
11547 curr_insn_type
= INSN_T1
;
11549 curr_insn_type
= INSN_T2
;
11551 else if (opc3
& 0x01)
11554 if ((opc2
== 0x08) || (opc2
& 0x0e) == 0x0c)
11556 if (!bit (arm_insn_r
->arm_insn
, 18))
11557 curr_insn_type
= INSN_T2
;
11561 curr_insn_type
= INSN_T1
;
11563 curr_insn_type
= INSN_T2
;
11567 else if ((opc2
& 0x0e) == 0x0a || (opc2
& 0x0e) == 0x0e)
11570 curr_insn_type
= INSN_T1
;
11572 curr_insn_type
= INSN_T2
;
11574 /* Handle VCVTB, VCVTT. */
11575 else if ((opc2
& 0x0e) == 0x02)
11576 curr_insn_type
= INSN_T2
;
11577 /* Handle VCMP, VCMPE. */
11578 else if ((opc2
& 0x0e) == 0x04)
11579 curr_insn_type
= INSN_T3
;
11583 switch (curr_insn_type
)
11586 reg_vd
= reg_vd
| (bit_d
<< 4);
11587 record_buf
[0] = reg_vd
+ ARM_D0_REGNUM
;
11588 record_buf
[1] = reg_vd
+ ARM_D0_REGNUM
+ 1;
11589 arm_insn_r
->reg_rec_count
= 2;
11593 reg_vd
= reg_vd
| (bit_d
<< 4);
11594 record_buf
[0] = reg_vd
+ ARM_D0_REGNUM
;
11595 arm_insn_r
->reg_rec_count
= 1;
11599 reg_vd
= (reg_vd
<< 1) | bit_d
;
11600 record_buf
[0] = reg_vd
+ ARM_D0_REGNUM
;
11601 arm_insn_r
->reg_rec_count
= 1;
11605 record_buf
[0] = ARM_FPSCR_REGNUM
;
11606 arm_insn_r
->reg_rec_count
= 1;
11610 gdb_assert_not_reached ("no decoding pattern found");
11614 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, record_buf
);
11618 /* Handling opcode 110 insns. */
11621 arm_record_asimd_vfp_coproc (insn_decode_record
*arm_insn_r
)
11623 uint32_t op1
, op1_ebit
, coproc
;
11625 coproc
= bits (arm_insn_r
->arm_insn
, 8, 11);
11626 op1
= bits (arm_insn_r
->arm_insn
, 20, 25);
11627 op1_ebit
= bit (arm_insn_r
->arm_insn
, 20);
11629 if ((coproc
& 0x0e) == 0x0a)
11631 /* Handle extension register ld/st instructions. */
11633 return arm_record_exreg_ld_st_insn (arm_insn_r
);
11635 /* 64-bit transfers between arm core and extension registers. */
11636 if ((op1
& 0x3e) == 0x04)
11637 return arm_record_exreg_ld_st_insn (arm_insn_r
);
11641 /* Handle coprocessor ld/st instructions. */
11646 return arm_record_unsupported_insn (arm_insn_r
);
11649 return arm_record_unsupported_insn (arm_insn_r
);
11652 /* Move to coprocessor from two arm core registers. */
11654 return arm_record_unsupported_insn (arm_insn_r
);
11656 /* Move to two arm core registers from coprocessor. */
11661 reg_t
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
11662 reg_t
[1] = bits (arm_insn_r
->arm_insn
, 16, 19);
11663 arm_insn_r
->reg_rec_count
= 2;
11665 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
, reg_t
);
11669 return arm_record_unsupported_insn (arm_insn_r
);
11672 /* Handling opcode 111 insns. */
11675 arm_record_coproc_data_proc (insn_decode_record
*arm_insn_r
)
11677 uint32_t op
, op1_ebit
, coproc
, bits_24_25
;
11678 struct gdbarch_tdep
*tdep
= gdbarch_tdep (arm_insn_r
->gdbarch
);
11679 struct regcache
*reg_cache
= arm_insn_r
->regcache
;
11681 arm_insn_r
->opcode
= bits (arm_insn_r
->arm_insn
, 24, 27);
11682 coproc
= bits (arm_insn_r
->arm_insn
, 8, 11);
11683 op1_ebit
= bit (arm_insn_r
->arm_insn
, 20);
11684 op
= bit (arm_insn_r
->arm_insn
, 4);
11685 bits_24_25
= bits (arm_insn_r
->arm_insn
, 24, 25);
11687 /* Handle arm SWI/SVC system call instructions. */
11688 if (bits_24_25
== 0x3)
11690 if (tdep
->arm_syscall_record
!= NULL
)
11692 ULONGEST svc_operand
, svc_number
;
11694 svc_operand
= (0x00ffffff & arm_insn_r
->arm_insn
);
11696 if (svc_operand
) /* OABI. */
11697 svc_number
= svc_operand
- 0x900000;
11699 regcache_raw_read_unsigned (reg_cache
, 7, &svc_number
);
11701 return tdep
->arm_syscall_record (reg_cache
, svc_number
);
11705 printf_unfiltered (_("no syscall record support\n"));
11709 else if (bits_24_25
== 0x02)
11713 if ((coproc
& 0x0e) == 0x0a)
11715 /* 8, 16, and 32-bit transfer */
11716 return arm_record_vdata_transfer_insn (arm_insn_r
);
11723 uint32_t record_buf
[1];
11725 record_buf
[0] = bits (arm_insn_r
->arm_insn
, 12, 15);
11726 if (record_buf
[0] == 15)
11727 record_buf
[0] = ARM_PS_REGNUM
;
11729 arm_insn_r
->reg_rec_count
= 1;
11730 REG_ALLOC (arm_insn_r
->arm_regs
, arm_insn_r
->reg_rec_count
,
11743 if ((coproc
& 0x0e) == 0x0a)
11745 /* VFP data-processing instructions. */
11746 return arm_record_vfp_data_proc_insn (arm_insn_r
);
11757 unsigned int op1
= bits (arm_insn_r
->arm_insn
, 20, 25);
11761 if ((coproc
& 0x0e) != 0x0a)
11767 else if (op1
== 4 || op1
== 5)
11769 if ((coproc
& 0x0e) == 0x0a)
11771 /* 64-bit transfers between ARM core and extension */
11780 else if (op1
== 0 || op1
== 1)
11787 if ((coproc
& 0x0e) == 0x0a)
11789 /* Extension register load/store */
11793 /* STC, STC2, LDC, LDC2 */
11802 /* Handling opcode 000 insns. */
11805 thumb_record_shift_add_sub (insn_decode_record
*thumb_insn_r
)
11807 uint32_t record_buf
[8];
11808 uint32_t reg_src1
= 0;
11810 reg_src1
= bits (thumb_insn_r
->arm_insn
, 0, 2);
11812 record_buf
[0] = ARM_PS_REGNUM
;
11813 record_buf
[1] = reg_src1
;
11814 thumb_insn_r
->reg_rec_count
= 2;
11816 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
11822 /* Handling opcode 001 insns. */
11825 thumb_record_add_sub_cmp_mov (insn_decode_record
*thumb_insn_r
)
11827 uint32_t record_buf
[8];
11828 uint32_t reg_src1
= 0;
11830 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
11832 record_buf
[0] = ARM_PS_REGNUM
;
11833 record_buf
[1] = reg_src1
;
11834 thumb_insn_r
->reg_rec_count
= 2;
11836 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
11841 /* Handling opcode 010 insns. */
11844 thumb_record_ld_st_reg_offset (insn_decode_record
*thumb_insn_r
)
11846 struct regcache
*reg_cache
= thumb_insn_r
->regcache
;
11847 uint32_t record_buf
[8], record_buf_mem
[8];
11849 uint32_t reg_src1
= 0, reg_src2
= 0;
11850 uint32_t opcode1
= 0, opcode2
= 0, opcode3
= 0;
11852 ULONGEST u_regval
[2] = {0};
11854 opcode1
= bits (thumb_insn_r
->arm_insn
, 10, 12);
11856 if (bit (thumb_insn_r
->arm_insn
, 12))
11858 /* Handle load/store register offset. */
11859 uint32_t opB
= bits (thumb_insn_r
->arm_insn
, 9, 11);
11861 if (in_inclusive_range (opB
, 4U, 7U))
11863 /* LDR(2), LDRB(2) , LDRH(2), LDRSB, LDRSH. */
11864 reg_src1
= bits (thumb_insn_r
->arm_insn
,0, 2);
11865 record_buf
[0] = reg_src1
;
11866 thumb_insn_r
->reg_rec_count
= 1;
11868 else if (in_inclusive_range (opB
, 0U, 2U))
11870 /* STR(2), STRB(2), STRH(2) . */
11871 reg_src1
= bits (thumb_insn_r
->arm_insn
, 3, 5);
11872 reg_src2
= bits (thumb_insn_r
->arm_insn
, 6, 8);
11873 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
[0]);
11874 regcache_raw_read_unsigned (reg_cache
, reg_src2
, &u_regval
[1]);
11876 record_buf_mem
[0] = 4; /* STR (2). */
11878 record_buf_mem
[0] = 1; /* STRB (2). */
11880 record_buf_mem
[0] = 2; /* STRH (2). */
11881 record_buf_mem
[1] = u_regval
[0] + u_regval
[1];
11882 thumb_insn_r
->mem_rec_count
= 1;
11885 else if (bit (thumb_insn_r
->arm_insn
, 11))
11887 /* Handle load from literal pool. */
11889 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
11890 record_buf
[0] = reg_src1
;
11891 thumb_insn_r
->reg_rec_count
= 1;
11895 /* Special data instructions and branch and exchange */
11896 opcode2
= bits (thumb_insn_r
->arm_insn
, 8, 9);
11897 opcode3
= bits (thumb_insn_r
->arm_insn
, 0, 2);
11898 if ((3 == opcode2
) && (!opcode3
))
11900 /* Branch with exchange. */
11901 record_buf
[0] = ARM_PS_REGNUM
;
11902 thumb_insn_r
->reg_rec_count
= 1;
11906 /* Format 8; special data processing insns. */
11907 record_buf
[0] = ARM_PS_REGNUM
;
11908 record_buf
[1] = (bit (thumb_insn_r
->arm_insn
, 7) << 3
11909 | bits (thumb_insn_r
->arm_insn
, 0, 2));
11910 thumb_insn_r
->reg_rec_count
= 2;
11915 /* Format 5; data processing insns. */
11916 reg_src1
= bits (thumb_insn_r
->arm_insn
, 0, 2);
11917 if (bit (thumb_insn_r
->arm_insn
, 7))
11919 reg_src1
= reg_src1
+ 8;
11921 record_buf
[0] = ARM_PS_REGNUM
;
11922 record_buf
[1] = reg_src1
;
11923 thumb_insn_r
->reg_rec_count
= 2;
11926 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
11927 MEM_ALLOC (thumb_insn_r
->arm_mems
, thumb_insn_r
->mem_rec_count
,
11933 /* Handling opcode 001 insns. */
11936 thumb_record_ld_st_imm_offset (insn_decode_record
*thumb_insn_r
)
11938 struct regcache
*reg_cache
= thumb_insn_r
->regcache
;
11939 uint32_t record_buf
[8], record_buf_mem
[8];
11941 uint32_t reg_src1
= 0;
11942 uint32_t opcode
= 0, immed_5
= 0;
11944 ULONGEST u_regval
= 0;
11946 opcode
= bits (thumb_insn_r
->arm_insn
, 11, 12);
11951 reg_src1
= bits (thumb_insn_r
->arm_insn
, 0, 2);
11952 record_buf
[0] = reg_src1
;
11953 thumb_insn_r
->reg_rec_count
= 1;
11958 reg_src1
= bits (thumb_insn_r
->arm_insn
, 3, 5);
11959 immed_5
= bits (thumb_insn_r
->arm_insn
, 6, 10);
11960 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
);
11961 record_buf_mem
[0] = 4;
11962 record_buf_mem
[1] = u_regval
+ (immed_5
* 4);
11963 thumb_insn_r
->mem_rec_count
= 1;
11966 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
11967 MEM_ALLOC (thumb_insn_r
->arm_mems
, thumb_insn_r
->mem_rec_count
,
11973 /* Handling opcode 100 insns. */
11976 thumb_record_ld_st_stack (insn_decode_record
*thumb_insn_r
)
11978 struct regcache
*reg_cache
= thumb_insn_r
->regcache
;
11979 uint32_t record_buf
[8], record_buf_mem
[8];
11981 uint32_t reg_src1
= 0;
11982 uint32_t opcode
= 0, immed_8
= 0, immed_5
= 0;
11984 ULONGEST u_regval
= 0;
11986 opcode
= bits (thumb_insn_r
->arm_insn
, 11, 12);
11991 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
11992 record_buf
[0] = reg_src1
;
11993 thumb_insn_r
->reg_rec_count
= 1;
11995 else if (1 == opcode
)
11998 reg_src1
= bits (thumb_insn_r
->arm_insn
, 0, 2);
11999 record_buf
[0] = reg_src1
;
12000 thumb_insn_r
->reg_rec_count
= 1;
12002 else if (2 == opcode
)
12005 immed_8
= bits (thumb_insn_r
->arm_insn
, 0, 7);
12006 regcache_raw_read_unsigned (reg_cache
, ARM_SP_REGNUM
, &u_regval
);
12007 record_buf_mem
[0] = 4;
12008 record_buf_mem
[1] = u_regval
+ (immed_8
* 4);
12009 thumb_insn_r
->mem_rec_count
= 1;
12011 else if (0 == opcode
)
12014 immed_5
= bits (thumb_insn_r
->arm_insn
, 6, 10);
12015 reg_src1
= bits (thumb_insn_r
->arm_insn
, 3, 5);
12016 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
);
12017 record_buf_mem
[0] = 2;
12018 record_buf_mem
[1] = u_regval
+ (immed_5
* 2);
12019 thumb_insn_r
->mem_rec_count
= 1;
12022 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
12023 MEM_ALLOC (thumb_insn_r
->arm_mems
, thumb_insn_r
->mem_rec_count
,
12029 /* Handling opcode 101 insns. */
12032 thumb_record_misc (insn_decode_record
*thumb_insn_r
)
12034 struct regcache
*reg_cache
= thumb_insn_r
->regcache
;
12036 uint32_t opcode
= 0;
12037 uint32_t register_bits
= 0, register_count
= 0;
12038 uint32_t index
= 0, start_address
= 0;
12039 uint32_t record_buf
[24], record_buf_mem
[48];
12042 ULONGEST u_regval
= 0;
12044 opcode
= bits (thumb_insn_r
->arm_insn
, 11, 12);
12046 if (opcode
== 0 || opcode
== 1)
12048 /* ADR and ADD (SP plus immediate) */
12050 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
12051 record_buf
[0] = reg_src1
;
12052 thumb_insn_r
->reg_rec_count
= 1;
12056 /* Miscellaneous 16-bit instructions */
12057 uint32_t opcode2
= bits (thumb_insn_r
->arm_insn
, 8, 11);
12062 /* SETEND and CPS */
12065 /* ADD/SUB (SP plus immediate) */
12066 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
12067 record_buf
[0] = ARM_SP_REGNUM
;
12068 thumb_insn_r
->reg_rec_count
= 1;
12070 case 1: /* fall through */
12071 case 3: /* fall through */
12072 case 9: /* fall through */
12077 /* SXTH, SXTB, UXTH, UXTB */
12078 record_buf
[0] = bits (thumb_insn_r
->arm_insn
, 0, 2);
12079 thumb_insn_r
->reg_rec_count
= 1;
12081 case 4: /* fall through */
12084 register_bits
= bits (thumb_insn_r
->arm_insn
, 0, 7);
12085 regcache_raw_read_unsigned (reg_cache
, ARM_SP_REGNUM
, &u_regval
);
12086 while (register_bits
)
12088 if (register_bits
& 0x00000001)
12090 register_bits
= register_bits
>> 1;
12092 start_address
= u_regval
- \
12093 (4 * (bit (thumb_insn_r
->arm_insn
, 8) + register_count
));
12094 thumb_insn_r
->mem_rec_count
= register_count
;
12095 while (register_count
)
12097 record_buf_mem
[(register_count
* 2) - 1] = start_address
;
12098 record_buf_mem
[(register_count
* 2) - 2] = 4;
12099 start_address
= start_address
+ 4;
12102 record_buf
[0] = ARM_SP_REGNUM
;
12103 thumb_insn_r
->reg_rec_count
= 1;
12106 /* REV, REV16, REVSH */
12107 record_buf
[0] = bits (thumb_insn_r
->arm_insn
, 0, 2);
12108 thumb_insn_r
->reg_rec_count
= 1;
12110 case 12: /* fall through */
12113 register_bits
= bits (thumb_insn_r
->arm_insn
, 0, 7);
12114 while (register_bits
)
12116 if (register_bits
& 0x00000001)
12117 record_buf
[index
++] = register_count
;
12118 register_bits
= register_bits
>> 1;
12121 record_buf
[index
++] = ARM_PS_REGNUM
;
12122 record_buf
[index
++] = ARM_SP_REGNUM
;
12123 thumb_insn_r
->reg_rec_count
= index
;
12127 /* Handle enhanced software breakpoint insn, BKPT. */
12128 /* CPSR is changed to be executed in ARM state, disabling normal
12129 interrupts, entering abort mode. */
12130 /* According to high vector configuration PC is set. */
12131 /* User hits breakpoint and type reverse, in that case, we need to go back with
12132 previous CPSR and Program Counter. */
12133 record_buf
[0] = ARM_PS_REGNUM
;
12134 record_buf
[1] = ARM_LR_REGNUM
;
12135 thumb_insn_r
->reg_rec_count
= 2;
12136 /* We need to save SPSR value, which is not yet done. */
12137 printf_unfiltered (_("Process record does not support instruction "
12138 "0x%0x at address %s.\n"),
12139 thumb_insn_r
->arm_insn
,
12140 paddress (thumb_insn_r
->gdbarch
,
12141 thumb_insn_r
->this_addr
));
12145 /* If-Then, and hints */
12152 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
12153 MEM_ALLOC (thumb_insn_r
->arm_mems
, thumb_insn_r
->mem_rec_count
,
12159 /* Handling opcode 110 insns. */
12162 thumb_record_ldm_stm_swi (insn_decode_record
*thumb_insn_r
)
12164 struct gdbarch_tdep
*tdep
= gdbarch_tdep (thumb_insn_r
->gdbarch
);
12165 struct regcache
*reg_cache
= thumb_insn_r
->regcache
;
12167 uint32_t ret
= 0; /* function return value: -1:record failure ; 0:success */
12168 uint32_t reg_src1
= 0;
12169 uint32_t opcode1
= 0, opcode2
= 0, register_bits
= 0, register_count
= 0;
12170 uint32_t index
= 0, start_address
= 0;
12171 uint32_t record_buf
[24], record_buf_mem
[48];
12173 ULONGEST u_regval
= 0;
12175 opcode1
= bits (thumb_insn_r
->arm_insn
, 8, 12);
12176 opcode2
= bits (thumb_insn_r
->arm_insn
, 11, 12);
12182 register_bits
= bits (thumb_insn_r
->arm_insn
, 0, 7);
12184 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
12185 while (register_bits
)
12187 if (register_bits
& 0x00000001)
12188 record_buf
[index
++] = register_count
;
12189 register_bits
= register_bits
>> 1;
12192 record_buf
[index
++] = reg_src1
;
12193 thumb_insn_r
->reg_rec_count
= index
;
12195 else if (0 == opcode2
)
12197 /* It handles both STMIA. */
12198 register_bits
= bits (thumb_insn_r
->arm_insn
, 0, 7);
12200 reg_src1
= bits (thumb_insn_r
->arm_insn
, 8, 10);
12201 regcache_raw_read_unsigned (reg_cache
, reg_src1
, &u_regval
);
12202 while (register_bits
)
12204 if (register_bits
& 0x00000001)
12206 register_bits
= register_bits
>> 1;
12208 start_address
= u_regval
;
12209 thumb_insn_r
->mem_rec_count
= register_count
;
12210 while (register_count
)
12212 record_buf_mem
[(register_count
* 2) - 1] = start_address
;
12213 record_buf_mem
[(register_count
* 2) - 2] = 4;
12214 start_address
= start_address
+ 4;
12218 else if (0x1F == opcode1
)
12220 /* Handle arm syscall insn. */
12221 if (tdep
->arm_syscall_record
!= NULL
)
12223 regcache_raw_read_unsigned (reg_cache
, 7, &u_regval
);
12224 ret
= tdep
->arm_syscall_record (reg_cache
, u_regval
);
12228 printf_unfiltered (_("no syscall record support\n"));
12233 /* B (1), conditional branch is automatically taken care in process_record,
12234 as PC is saved there. */
12236 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
12237 MEM_ALLOC (thumb_insn_r
->arm_mems
, thumb_insn_r
->mem_rec_count
,
12243 /* Handling opcode 111 insns. */
12246 thumb_record_branch (insn_decode_record
*thumb_insn_r
)
12248 uint32_t record_buf
[8];
12249 uint32_t bits_h
= 0;
12251 bits_h
= bits (thumb_insn_r
->arm_insn
, 11, 12);
12253 if (2 == bits_h
|| 3 == bits_h
)
12256 record_buf
[0] = ARM_LR_REGNUM
;
12257 thumb_insn_r
->reg_rec_count
= 1;
12259 else if (1 == bits_h
)
12262 record_buf
[0] = ARM_PS_REGNUM
;
12263 record_buf
[1] = ARM_LR_REGNUM
;
12264 thumb_insn_r
->reg_rec_count
= 2;
12267 /* B(2) is automatically taken care in process_record, as PC is
12270 REG_ALLOC (thumb_insn_r
->arm_regs
, thumb_insn_r
->reg_rec_count
, record_buf
);
12275 /* Handler for thumb2 load/store multiple instructions. */
12278 thumb2_record_ld_st_multiple (insn_decode_record
*thumb2_insn_r
)
12280 struct regcache
*reg_cache
= thumb2_insn_r
->regcache
;
12282 uint32_t reg_rn
, op
;
12283 uint32_t register_bits
= 0, register_count
= 0;
12284 uint32_t index
= 0, start_address
= 0;
12285 uint32_t record_buf
[24], record_buf_mem
[48];
12287 ULONGEST u_regval
= 0;
12289 reg_rn
= bits (thumb2_insn_r
->arm_insn
, 16, 19);
12290 op
= bits (thumb2_insn_r
->arm_insn
, 23, 24);
12292 if (0 == op
|| 3 == op
)
12294 if (bit (thumb2_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
12296 /* Handle RFE instruction. */
12297 record_buf
[0] = ARM_PS_REGNUM
;
12298 thumb2_insn_r
->reg_rec_count
= 1;
12302 /* Handle SRS instruction after reading banked SP. */
12303 return arm_record_unsupported_insn (thumb2_insn_r
);
12306 else if (1 == op
|| 2 == op
)
12308 if (bit (thumb2_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
12310 /* Handle LDM/LDMIA/LDMFD and LDMDB/LDMEA instructions. */
12311 register_bits
= bits (thumb2_insn_r
->arm_insn
, 0, 15);
12312 while (register_bits
)
12314 if (register_bits
& 0x00000001)
12315 record_buf
[index
++] = register_count
;
12318 register_bits
= register_bits
>> 1;
12320 record_buf
[index
++] = reg_rn
;
12321 record_buf
[index
++] = ARM_PS_REGNUM
;
12322 thumb2_insn_r
->reg_rec_count
= index
;
12326 /* Handle STM/STMIA/STMEA and STMDB/STMFD. */
12327 register_bits
= bits (thumb2_insn_r
->arm_insn
, 0, 15);
12328 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
);
12329 while (register_bits
)
12331 if (register_bits
& 0x00000001)
12334 register_bits
= register_bits
>> 1;
12339 /* Start address calculation for LDMDB/LDMEA. */
12340 start_address
= u_regval
;
12344 /* Start address calculation for LDMDB/LDMEA. */
12345 start_address
= u_regval
- register_count
* 4;
12348 thumb2_insn_r
->mem_rec_count
= register_count
;
12349 while (register_count
)
12351 record_buf_mem
[register_count
* 2 - 1] = start_address
;
12352 record_buf_mem
[register_count
* 2 - 2] = 4;
12353 start_address
= start_address
+ 4;
12356 record_buf
[0] = reg_rn
;
12357 record_buf
[1] = ARM_PS_REGNUM
;
12358 thumb2_insn_r
->reg_rec_count
= 2;
12362 MEM_ALLOC (thumb2_insn_r
->arm_mems
, thumb2_insn_r
->mem_rec_count
,
12364 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12366 return ARM_RECORD_SUCCESS
;
12369 /* Handler for thumb2 load/store (dual/exclusive) and table branch
12373 thumb2_record_ld_st_dual_ex_tbb (insn_decode_record
*thumb2_insn_r
)
12375 struct regcache
*reg_cache
= thumb2_insn_r
->regcache
;
12377 uint32_t reg_rd
, reg_rn
, offset_imm
;
12378 uint32_t reg_dest1
, reg_dest2
;
12379 uint32_t address
, offset_addr
;
12380 uint32_t record_buf
[8], record_buf_mem
[8];
12381 uint32_t op1
, op2
, op3
;
12383 ULONGEST u_regval
[2];
12385 op1
= bits (thumb2_insn_r
->arm_insn
, 23, 24);
12386 op2
= bits (thumb2_insn_r
->arm_insn
, 20, 21);
12387 op3
= bits (thumb2_insn_r
->arm_insn
, 4, 7);
12389 if (bit (thumb2_insn_r
->arm_insn
, INSN_S_L_BIT_NUM
))
12391 if(!(1 == op1
&& 1 == op2
&& (0 == op3
|| 1 == op3
)))
12393 reg_dest1
= bits (thumb2_insn_r
->arm_insn
, 12, 15);
12394 record_buf
[0] = reg_dest1
;
12395 record_buf
[1] = ARM_PS_REGNUM
;
12396 thumb2_insn_r
->reg_rec_count
= 2;
12399 if (3 == op2
|| (op1
& 2) || (1 == op1
&& 1 == op2
&& 7 == op3
))
12401 reg_dest2
= bits (thumb2_insn_r
->arm_insn
, 8, 11);
12402 record_buf
[2] = reg_dest2
;
12403 thumb2_insn_r
->reg_rec_count
= 3;
12408 reg_rn
= bits (thumb2_insn_r
->arm_insn
, 16, 19);
12409 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
[0]);
12411 if (0 == op1
&& 0 == op2
)
12413 /* Handle STREX. */
12414 offset_imm
= bits (thumb2_insn_r
->arm_insn
, 0, 7);
12415 address
= u_regval
[0] + (offset_imm
* 4);
12416 record_buf_mem
[0] = 4;
12417 record_buf_mem
[1] = address
;
12418 thumb2_insn_r
->mem_rec_count
= 1;
12419 reg_rd
= bits (thumb2_insn_r
->arm_insn
, 0, 3);
12420 record_buf
[0] = reg_rd
;
12421 thumb2_insn_r
->reg_rec_count
= 1;
12423 else if (1 == op1
&& 0 == op2
)
12425 reg_rd
= bits (thumb2_insn_r
->arm_insn
, 0, 3);
12426 record_buf
[0] = reg_rd
;
12427 thumb2_insn_r
->reg_rec_count
= 1;
12428 address
= u_regval
[0];
12429 record_buf_mem
[1] = address
;
12433 /* Handle STREXB. */
12434 record_buf_mem
[0] = 1;
12435 thumb2_insn_r
->mem_rec_count
= 1;
12439 /* Handle STREXH. */
12440 record_buf_mem
[0] = 2 ;
12441 thumb2_insn_r
->mem_rec_count
= 1;
12445 /* Handle STREXD. */
12446 address
= u_regval
[0];
12447 record_buf_mem
[0] = 4;
12448 record_buf_mem
[2] = 4;
12449 record_buf_mem
[3] = address
+ 4;
12450 thumb2_insn_r
->mem_rec_count
= 2;
12455 offset_imm
= bits (thumb2_insn_r
->arm_insn
, 0, 7);
12457 if (bit (thumb2_insn_r
->arm_insn
, 24))
12459 if (bit (thumb2_insn_r
->arm_insn
, 23))
12460 offset_addr
= u_regval
[0] + (offset_imm
* 4);
12462 offset_addr
= u_regval
[0] - (offset_imm
* 4);
12464 address
= offset_addr
;
12467 address
= u_regval
[0];
12469 record_buf_mem
[0] = 4;
12470 record_buf_mem
[1] = address
;
12471 record_buf_mem
[2] = 4;
12472 record_buf_mem
[3] = address
+ 4;
12473 thumb2_insn_r
->mem_rec_count
= 2;
12474 record_buf
[0] = reg_rn
;
12475 thumb2_insn_r
->reg_rec_count
= 1;
12479 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12481 MEM_ALLOC (thumb2_insn_r
->arm_mems
, thumb2_insn_r
->mem_rec_count
,
12483 return ARM_RECORD_SUCCESS
;
12486 /* Handler for thumb2 data processing (shift register and modified immediate)
12490 thumb2_record_data_proc_sreg_mimm (insn_decode_record
*thumb2_insn_r
)
12492 uint32_t reg_rd
, op
;
12493 uint32_t record_buf
[8];
12495 op
= bits (thumb2_insn_r
->arm_insn
, 21, 24);
12496 reg_rd
= bits (thumb2_insn_r
->arm_insn
, 8, 11);
12498 if ((0 == op
|| 4 == op
|| 8 == op
|| 13 == op
) && 15 == reg_rd
)
12500 record_buf
[0] = ARM_PS_REGNUM
;
12501 thumb2_insn_r
->reg_rec_count
= 1;
12505 record_buf
[0] = reg_rd
;
12506 record_buf
[1] = ARM_PS_REGNUM
;
12507 thumb2_insn_r
->reg_rec_count
= 2;
12510 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12512 return ARM_RECORD_SUCCESS
;
12515 /* Generic handler for thumb2 instructions which effect destination and PS
12519 thumb2_record_ps_dest_generic (insn_decode_record
*thumb2_insn_r
)
12522 uint32_t record_buf
[8];
12524 reg_rd
= bits (thumb2_insn_r
->arm_insn
, 8, 11);
12526 record_buf
[0] = reg_rd
;
12527 record_buf
[1] = ARM_PS_REGNUM
;
12528 thumb2_insn_r
->reg_rec_count
= 2;
12530 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12532 return ARM_RECORD_SUCCESS
;
12535 /* Handler for thumb2 branch and miscellaneous control instructions. */
12538 thumb2_record_branch_misc_cntrl (insn_decode_record
*thumb2_insn_r
)
12540 uint32_t op
, op1
, op2
;
12541 uint32_t record_buf
[8];
12543 op
= bits (thumb2_insn_r
->arm_insn
, 20, 26);
12544 op1
= bits (thumb2_insn_r
->arm_insn
, 12, 14);
12545 op2
= bits (thumb2_insn_r
->arm_insn
, 8, 11);
12547 /* Handle MSR insn. */
12548 if (!(op1
& 0x2) && 0x38 == op
)
12552 /* CPSR is going to be changed. */
12553 record_buf
[0] = ARM_PS_REGNUM
;
12554 thumb2_insn_r
->reg_rec_count
= 1;
12558 arm_record_unsupported_insn(thumb2_insn_r
);
12562 else if (4 == (op1
& 0x5) || 5 == (op1
& 0x5))
12565 record_buf
[0] = ARM_PS_REGNUM
;
12566 record_buf
[1] = ARM_LR_REGNUM
;
12567 thumb2_insn_r
->reg_rec_count
= 2;
12570 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12572 return ARM_RECORD_SUCCESS
;
12575 /* Handler for thumb2 store single data item instructions. */
12578 thumb2_record_str_single_data (insn_decode_record
*thumb2_insn_r
)
12580 struct regcache
*reg_cache
= thumb2_insn_r
->regcache
;
12582 uint32_t reg_rn
, reg_rm
, offset_imm
, shift_imm
;
12583 uint32_t address
, offset_addr
;
12584 uint32_t record_buf
[8], record_buf_mem
[8];
12587 ULONGEST u_regval
[2];
12589 op1
= bits (thumb2_insn_r
->arm_insn
, 21, 23);
12590 op2
= bits (thumb2_insn_r
->arm_insn
, 6, 11);
12591 reg_rn
= bits (thumb2_insn_r
->arm_insn
, 16, 19);
12592 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
[0]);
12594 if (bit (thumb2_insn_r
->arm_insn
, 23))
12597 offset_imm
= bits (thumb2_insn_r
->arm_insn
, 0, 11);
12598 offset_addr
= u_regval
[0] + offset_imm
;
12599 address
= offset_addr
;
12604 if ((0 == op1
|| 1 == op1
|| 2 == op1
) && !(op2
& 0x20))
12606 /* Handle STRB (register). */
12607 reg_rm
= bits (thumb2_insn_r
->arm_insn
, 0, 3);
12608 regcache_raw_read_unsigned (reg_cache
, reg_rm
, &u_regval
[1]);
12609 shift_imm
= bits (thumb2_insn_r
->arm_insn
, 4, 5);
12610 offset_addr
= u_regval
[1] << shift_imm
;
12611 address
= u_regval
[0] + offset_addr
;
12615 offset_imm
= bits (thumb2_insn_r
->arm_insn
, 0, 7);
12616 if (bit (thumb2_insn_r
->arm_insn
, 10))
12618 if (bit (thumb2_insn_r
->arm_insn
, 9))
12619 offset_addr
= u_regval
[0] + offset_imm
;
12621 offset_addr
= u_regval
[0] - offset_imm
;
12623 address
= offset_addr
;
12626 address
= u_regval
[0];
12632 /* Store byte instructions. */
12635 record_buf_mem
[0] = 1;
12637 /* Store half word instructions. */
12640 record_buf_mem
[0] = 2;
12642 /* Store word instructions. */
12645 record_buf_mem
[0] = 4;
12649 gdb_assert_not_reached ("no decoding pattern found");
12653 record_buf_mem
[1] = address
;
12654 thumb2_insn_r
->mem_rec_count
= 1;
12655 record_buf
[0] = reg_rn
;
12656 thumb2_insn_r
->reg_rec_count
= 1;
12658 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12660 MEM_ALLOC (thumb2_insn_r
->arm_mems
, thumb2_insn_r
->mem_rec_count
,
12662 return ARM_RECORD_SUCCESS
;
12665 /* Handler for thumb2 load memory hints instructions. */
12668 thumb2_record_ld_mem_hints (insn_decode_record
*thumb2_insn_r
)
12670 uint32_t record_buf
[8];
12671 uint32_t reg_rt
, reg_rn
;
12673 reg_rt
= bits (thumb2_insn_r
->arm_insn
, 12, 15);
12674 reg_rn
= bits (thumb2_insn_r
->arm_insn
, 16, 19);
12676 if (ARM_PC_REGNUM
!= reg_rt
)
12678 record_buf
[0] = reg_rt
;
12679 record_buf
[1] = reg_rn
;
12680 record_buf
[2] = ARM_PS_REGNUM
;
12681 thumb2_insn_r
->reg_rec_count
= 3;
12683 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12685 return ARM_RECORD_SUCCESS
;
12688 return ARM_RECORD_FAILURE
;
12691 /* Handler for thumb2 load word instructions. */
12694 thumb2_record_ld_word (insn_decode_record
*thumb2_insn_r
)
12696 uint32_t record_buf
[8];
12698 record_buf
[0] = bits (thumb2_insn_r
->arm_insn
, 12, 15);
12699 record_buf
[1] = ARM_PS_REGNUM
;
12700 thumb2_insn_r
->reg_rec_count
= 2;
12702 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12704 return ARM_RECORD_SUCCESS
;
12707 /* Handler for thumb2 long multiply, long multiply accumulate, and
12708 divide instructions. */
12711 thumb2_record_lmul_lmla_div (insn_decode_record
*thumb2_insn_r
)
12713 uint32_t opcode1
= 0, opcode2
= 0;
12714 uint32_t record_buf
[8];
12716 opcode1
= bits (thumb2_insn_r
->arm_insn
, 20, 22);
12717 opcode2
= bits (thumb2_insn_r
->arm_insn
, 4, 7);
12719 if (0 == opcode1
|| 2 == opcode1
|| (opcode1
>= 4 && opcode1
<= 6))
12721 /* Handle SMULL, UMULL, SMULAL. */
12722 /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */
12723 record_buf
[0] = bits (thumb2_insn_r
->arm_insn
, 16, 19);
12724 record_buf
[1] = bits (thumb2_insn_r
->arm_insn
, 12, 15);
12725 record_buf
[2] = ARM_PS_REGNUM
;
12726 thumb2_insn_r
->reg_rec_count
= 3;
12728 else if (1 == opcode1
|| 3 == opcode2
)
12730 /* Handle SDIV and UDIV. */
12731 record_buf
[0] = bits (thumb2_insn_r
->arm_insn
, 16, 19);
12732 record_buf
[1] = bits (thumb2_insn_r
->arm_insn
, 12, 15);
12733 record_buf
[2] = ARM_PS_REGNUM
;
12734 thumb2_insn_r
->reg_rec_count
= 3;
12737 return ARM_RECORD_FAILURE
;
12739 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12741 return ARM_RECORD_SUCCESS
;
12744 /* Record handler for thumb32 coprocessor instructions. */
12747 thumb2_record_coproc_insn (insn_decode_record
*thumb2_insn_r
)
12749 if (bit (thumb2_insn_r
->arm_insn
, 25))
12750 return arm_record_coproc_data_proc (thumb2_insn_r
);
12752 return arm_record_asimd_vfp_coproc (thumb2_insn_r
);
12755 /* Record handler for advance SIMD structure load/store instructions. */
12758 thumb2_record_asimd_struct_ld_st (insn_decode_record
*thumb2_insn_r
)
12760 struct regcache
*reg_cache
= thumb2_insn_r
->regcache
;
12761 uint32_t l_bit
, a_bit
, b_bits
;
12762 uint32_t record_buf
[128], record_buf_mem
[128];
12763 uint32_t reg_rn
, reg_vd
, address
, f_elem
;
12764 uint32_t index_r
= 0, index_e
= 0, bf_regs
= 0, index_m
= 0, loop_t
= 0;
12767 l_bit
= bit (thumb2_insn_r
->arm_insn
, 21);
12768 a_bit
= bit (thumb2_insn_r
->arm_insn
, 23);
12769 b_bits
= bits (thumb2_insn_r
->arm_insn
, 8, 11);
12770 reg_rn
= bits (thumb2_insn_r
->arm_insn
, 16, 19);
12771 reg_vd
= bits (thumb2_insn_r
->arm_insn
, 12, 15);
12772 reg_vd
= (bit (thumb2_insn_r
->arm_insn
, 22) << 4) | reg_vd
;
12773 f_ebytes
= (1 << bits (thumb2_insn_r
->arm_insn
, 6, 7));
12774 f_elem
= 8 / f_ebytes
;
12778 ULONGEST u_regval
= 0;
12779 regcache_raw_read_unsigned (reg_cache
, reg_rn
, &u_regval
);
12780 address
= u_regval
;
12785 if (b_bits
== 0x02 || b_bits
== 0x0a || (b_bits
& 0x0e) == 0x06)
12787 if (b_bits
== 0x07)
12789 else if (b_bits
== 0x0a)
12791 else if (b_bits
== 0x06)
12793 else if (b_bits
== 0x02)
12798 for (index_r
= 0; index_r
< bf_regs
; index_r
++)
12800 for (index_e
= 0; index_e
< f_elem
; index_e
++)
12802 record_buf_mem
[index_m
++] = f_ebytes
;
12803 record_buf_mem
[index_m
++] = address
;
12804 address
= address
+ f_ebytes
;
12805 thumb2_insn_r
->mem_rec_count
+= 1;
12810 else if (b_bits
== 0x03 || (b_bits
& 0x0e) == 0x08)
12812 if (b_bits
== 0x09 || b_bits
== 0x08)
12814 else if (b_bits
== 0x03)
12819 for (index_r
= 0; index_r
< bf_regs
; index_r
++)
12820 for (index_e
= 0; index_e
< f_elem
; index_e
++)
12822 for (loop_t
= 0; loop_t
< 2; loop_t
++)
12824 record_buf_mem
[index_m
++] = f_ebytes
;
12825 record_buf_mem
[index_m
++] = address
+ (loop_t
* f_ebytes
);
12826 thumb2_insn_r
->mem_rec_count
+= 1;
12828 address
= address
+ (2 * f_ebytes
);
12832 else if ((b_bits
& 0x0e) == 0x04)
12834 for (index_e
= 0; index_e
< f_elem
; index_e
++)
12836 for (loop_t
= 0; loop_t
< 3; loop_t
++)
12838 record_buf_mem
[index_m
++] = f_ebytes
;
12839 record_buf_mem
[index_m
++] = address
+ (loop_t
* f_ebytes
);
12840 thumb2_insn_r
->mem_rec_count
+= 1;
12842 address
= address
+ (3 * f_ebytes
);
12846 else if (!(b_bits
& 0x0e))
12848 for (index_e
= 0; index_e
< f_elem
; index_e
++)
12850 for (loop_t
= 0; loop_t
< 4; loop_t
++)
12852 record_buf_mem
[index_m
++] = f_ebytes
;
12853 record_buf_mem
[index_m
++] = address
+ (loop_t
* f_ebytes
);
12854 thumb2_insn_r
->mem_rec_count
+= 1;
12856 address
= address
+ (4 * f_ebytes
);
12862 uint8_t bft_size
= bits (thumb2_insn_r
->arm_insn
, 10, 11);
12864 if (bft_size
== 0x00)
12866 else if (bft_size
== 0x01)
12868 else if (bft_size
== 0x02)
12874 if (!(b_bits
& 0x0b) || b_bits
== 0x08)
12875 thumb2_insn_r
->mem_rec_count
= 1;
12877 else if ((b_bits
& 0x0b) == 0x01 || b_bits
== 0x09)
12878 thumb2_insn_r
->mem_rec_count
= 2;
12880 else if ((b_bits
& 0x0b) == 0x02 || b_bits
== 0x0a)
12881 thumb2_insn_r
->mem_rec_count
= 3;
12883 else if ((b_bits
& 0x0b) == 0x03 || b_bits
== 0x0b)
12884 thumb2_insn_r
->mem_rec_count
= 4;
12886 for (index_m
= 0; index_m
< thumb2_insn_r
->mem_rec_count
; index_m
++)
12888 record_buf_mem
[index_m
] = f_ebytes
;
12889 record_buf_mem
[index_m
] = address
+ (index_m
* f_ebytes
);
12898 if (b_bits
== 0x02 || b_bits
== 0x0a || (b_bits
& 0x0e) == 0x06)
12899 thumb2_insn_r
->reg_rec_count
= 1;
12901 else if (b_bits
== 0x03 || (b_bits
& 0x0e) == 0x08)
12902 thumb2_insn_r
->reg_rec_count
= 2;
12904 else if ((b_bits
& 0x0e) == 0x04)
12905 thumb2_insn_r
->reg_rec_count
= 3;
12907 else if (!(b_bits
& 0x0e))
12908 thumb2_insn_r
->reg_rec_count
= 4;
12913 if (!(b_bits
& 0x0b) || b_bits
== 0x08 || b_bits
== 0x0c)
12914 thumb2_insn_r
->reg_rec_count
= 1;
12916 else if ((b_bits
& 0x0b) == 0x01 || b_bits
== 0x09 || b_bits
== 0x0d)
12917 thumb2_insn_r
->reg_rec_count
= 2;
12919 else if ((b_bits
& 0x0b) == 0x02 || b_bits
== 0x0a || b_bits
== 0x0e)
12920 thumb2_insn_r
->reg_rec_count
= 3;
12922 else if ((b_bits
& 0x0b) == 0x03 || b_bits
== 0x0b || b_bits
== 0x0f)
12923 thumb2_insn_r
->reg_rec_count
= 4;
12925 for (index_r
= 0; index_r
< thumb2_insn_r
->reg_rec_count
; index_r
++)
12926 record_buf
[index_r
] = reg_vd
+ ARM_D0_REGNUM
+ index_r
;
12930 if (bits (thumb2_insn_r
->arm_insn
, 0, 3) != 15)
12932 record_buf
[index_r
] = reg_rn
;
12933 thumb2_insn_r
->reg_rec_count
+= 1;
12936 REG_ALLOC (thumb2_insn_r
->arm_regs
, thumb2_insn_r
->reg_rec_count
,
12938 MEM_ALLOC (thumb2_insn_r
->arm_mems
, thumb2_insn_r
->mem_rec_count
,
12943 /* Decodes thumb2 instruction type and invokes its record handler. */
12945 static unsigned int
12946 thumb2_record_decode_insn_handler (insn_decode_record
*thumb2_insn_r
)
12948 uint32_t op
, op1
, op2
;
12950 op
= bit (thumb2_insn_r
->arm_insn
, 15);
12951 op1
= bits (thumb2_insn_r
->arm_insn
, 27, 28);
12952 op2
= bits (thumb2_insn_r
->arm_insn
, 20, 26);
12956 if (!(op2
& 0x64 ))
12958 /* Load/store multiple instruction. */
12959 return thumb2_record_ld_st_multiple (thumb2_insn_r
);
12961 else if ((op2
& 0x64) == 0x4)
12963 /* Load/store (dual/exclusive) and table branch instruction. */
12964 return thumb2_record_ld_st_dual_ex_tbb (thumb2_insn_r
);
12966 else if ((op2
& 0x60) == 0x20)
12968 /* Data-processing (shifted register). */
12969 return thumb2_record_data_proc_sreg_mimm (thumb2_insn_r
);
12971 else if (op2
& 0x40)
12973 /* Co-processor instructions. */
12974 return thumb2_record_coproc_insn (thumb2_insn_r
);
12977 else if (op1
== 0x02)
12981 /* Branches and miscellaneous control instructions. */
12982 return thumb2_record_branch_misc_cntrl (thumb2_insn_r
);
12984 else if (op2
& 0x20)
12986 /* Data-processing (plain binary immediate) instruction. */
12987 return thumb2_record_ps_dest_generic (thumb2_insn_r
);
12991 /* Data-processing (modified immediate). */
12992 return thumb2_record_data_proc_sreg_mimm (thumb2_insn_r
);
12995 else if (op1
== 0x03)
12997 if (!(op2
& 0x71 ))
12999 /* Store single data item. */
13000 return thumb2_record_str_single_data (thumb2_insn_r
);
13002 else if (!((op2
& 0x71) ^ 0x10))
13004 /* Advanced SIMD or structure load/store instructions. */
13005 return thumb2_record_asimd_struct_ld_st (thumb2_insn_r
);
13007 else if (!((op2
& 0x67) ^ 0x01))
13009 /* Load byte, memory hints instruction. */
13010 return thumb2_record_ld_mem_hints (thumb2_insn_r
);
13012 else if (!((op2
& 0x67) ^ 0x03))
13014 /* Load halfword, memory hints instruction. */
13015 return thumb2_record_ld_mem_hints (thumb2_insn_r
);
13017 else if (!((op2
& 0x67) ^ 0x05))
13019 /* Load word instruction. */
13020 return thumb2_record_ld_word (thumb2_insn_r
);
13022 else if (!((op2
& 0x70) ^ 0x20))
13024 /* Data-processing (register) instruction. */
13025 return thumb2_record_ps_dest_generic (thumb2_insn_r
);
13027 else if (!((op2
& 0x78) ^ 0x30))
13029 /* Multiply, multiply accumulate, abs diff instruction. */
13030 return thumb2_record_ps_dest_generic (thumb2_insn_r
);
13032 else if (!((op2
& 0x78) ^ 0x38))
13034 /* Long multiply, long multiply accumulate, and divide. */
13035 return thumb2_record_lmul_lmla_div (thumb2_insn_r
);
13037 else if (op2
& 0x40)
13039 /* Co-processor instructions. */
13040 return thumb2_record_coproc_insn (thumb2_insn_r
);
13048 /* Abstract memory reader. */
13050 class abstract_memory_reader
13053 /* Read LEN bytes of target memory at address MEMADDR, placing the
13054 results in GDB's memory at BUF. Return true on success. */
13056 virtual bool read (CORE_ADDR memaddr
, gdb_byte
*buf
, const size_t len
) = 0;
13059 /* Instruction reader from real target. */
13061 class instruction_reader
: public abstract_memory_reader
13064 bool read (CORE_ADDR memaddr
, gdb_byte
*buf
, const size_t len
) override
13066 if (target_read_memory (memaddr
, buf
, len
))
13075 /* Extracts arm/thumb/thumb2 insn depending on the size, and returns 0 on success
13076 and positive val on fauilure. */
13079 extract_arm_insn (abstract_memory_reader
& reader
,
13080 insn_decode_record
*insn_record
, uint32_t insn_size
)
13082 gdb_byte buf
[insn_size
];
13084 memset (&buf
[0], 0, insn_size
);
13086 if (!reader
.read (insn_record
->this_addr
, buf
, insn_size
))
13088 insn_record
->arm_insn
= (uint32_t) extract_unsigned_integer (&buf
[0],
13090 gdbarch_byte_order_for_code (insn_record
->gdbarch
));
13094 typedef int (*sti_arm_hdl_fp_t
) (insn_decode_record
*);
13096 /* Decode arm/thumb insn depending on condition cods and opcodes; and
13100 decode_insn (abstract_memory_reader
&reader
, insn_decode_record
*arm_record
,
13101 record_type_t record_type
, uint32_t insn_size
)
13104 /* (Starting from numerical 0); bits 25, 26, 27 decodes type of arm
13106 static const sti_arm_hdl_fp_t arm_handle_insn
[8] =
13108 arm_record_data_proc_misc_ld_str
, /* 000. */
13109 arm_record_data_proc_imm
, /* 001. */
13110 arm_record_ld_st_imm_offset
, /* 010. */
13111 arm_record_ld_st_reg_offset
, /* 011. */
13112 arm_record_ld_st_multiple
, /* 100. */
13113 arm_record_b_bl
, /* 101. */
13114 arm_record_asimd_vfp_coproc
, /* 110. */
13115 arm_record_coproc_data_proc
/* 111. */
13118 /* (Starting from numerical 0); bits 13,14,15 decodes type of thumb
13120 static const sti_arm_hdl_fp_t thumb_handle_insn
[8] =
13122 thumb_record_shift_add_sub
, /* 000. */
13123 thumb_record_add_sub_cmp_mov
, /* 001. */
13124 thumb_record_ld_st_reg_offset
, /* 010. */
13125 thumb_record_ld_st_imm_offset
, /* 011. */
13126 thumb_record_ld_st_stack
, /* 100. */
13127 thumb_record_misc
, /* 101. */
13128 thumb_record_ldm_stm_swi
, /* 110. */
13129 thumb_record_branch
/* 111. */
13132 uint32_t ret
= 0; /* return value: negative:failure 0:success. */
13133 uint32_t insn_id
= 0;
13135 if (extract_arm_insn (reader
, arm_record
, insn_size
))
13139 printf_unfiltered (_("Process record: error reading memory at "
13140 "addr %s len = %d.\n"),
13141 paddress (arm_record
->gdbarch
,
13142 arm_record
->this_addr
), insn_size
);
13146 else if (ARM_RECORD
== record_type
)
13148 arm_record
->cond
= bits (arm_record
->arm_insn
, 28, 31);
13149 insn_id
= bits (arm_record
->arm_insn
, 25, 27);
13151 if (arm_record
->cond
== 0xf)
13152 ret
= arm_record_extension_space (arm_record
);
13155 /* If this insn has fallen into extension space
13156 then we need not decode it anymore. */
13157 ret
= arm_handle_insn
[insn_id
] (arm_record
);
13159 if (ret
!= ARM_RECORD_SUCCESS
)
13161 arm_record_unsupported_insn (arm_record
);
13165 else if (THUMB_RECORD
== record_type
)
13167 /* As thumb does not have condition codes, we set negative. */
13168 arm_record
->cond
= -1;
13169 insn_id
= bits (arm_record
->arm_insn
, 13, 15);
13170 ret
= thumb_handle_insn
[insn_id
] (arm_record
);
13171 if (ret
!= ARM_RECORD_SUCCESS
)
13173 arm_record_unsupported_insn (arm_record
);
13177 else if (THUMB2_RECORD
== record_type
)
13179 /* As thumb does not have condition codes, we set negative. */
13180 arm_record
->cond
= -1;
13182 /* Swap first half of 32bit thumb instruction with second half. */
13183 arm_record
->arm_insn
13184 = (arm_record
->arm_insn
>> 16) | (arm_record
->arm_insn
<< 16);
13186 ret
= thumb2_record_decode_insn_handler (arm_record
);
13188 if (ret
!= ARM_RECORD_SUCCESS
)
13190 arm_record_unsupported_insn (arm_record
);
13196 /* Throw assertion. */
13197 gdb_assert_not_reached ("not a valid instruction, could not decode");
13204 namespace selftests
{
13206 /* Provide both 16-bit and 32-bit thumb instructions. */
13208 class instruction_reader_thumb
: public abstract_memory_reader
13211 template<size_t SIZE
>
13212 instruction_reader_thumb (enum bfd_endian endian
,
13213 const uint16_t (&insns
)[SIZE
])
13214 : m_endian (endian
), m_insns (insns
), m_insns_size (SIZE
)
13217 bool read (CORE_ADDR memaddr
, gdb_byte
*buf
, const size_t len
) override
13219 SELF_CHECK (len
== 4 || len
== 2);
13220 SELF_CHECK (memaddr
% 2 == 0);
13221 SELF_CHECK ((memaddr
/ 2) < m_insns_size
);
13223 store_unsigned_integer (buf
, 2, m_endian
, m_insns
[memaddr
/ 2]);
13226 store_unsigned_integer (&buf
[2], 2, m_endian
,
13227 m_insns
[memaddr
/ 2 + 1]);
13233 enum bfd_endian m_endian
;
13234 const uint16_t *m_insns
;
13235 size_t m_insns_size
;
13239 arm_record_test (void)
13241 struct gdbarch_info info
;
13242 gdbarch_info_init (&info
);
13243 info
.bfd_arch_info
= bfd_scan_arch ("arm");
13245 struct gdbarch
*gdbarch
= gdbarch_find_by_info (info
);
13247 SELF_CHECK (gdbarch
!= NULL
);
13249 /* 16-bit Thumb instructions. */
13251 insn_decode_record arm_record
;
13253 memset (&arm_record
, 0, sizeof (insn_decode_record
));
13254 arm_record
.gdbarch
= gdbarch
;
13256 static const uint16_t insns
[] = {
13257 /* db b2 uxtb r3, r3 */
13259 /* cd 58 ldr r5, [r1, r3] */
13263 enum bfd_endian endian
= gdbarch_byte_order_for_code (arm_record
.gdbarch
);
13264 instruction_reader_thumb
reader (endian
, insns
);
13265 int ret
= decode_insn (reader
, &arm_record
, THUMB_RECORD
,
13266 THUMB_INSN_SIZE_BYTES
);
13268 SELF_CHECK (ret
== 0);
13269 SELF_CHECK (arm_record
.mem_rec_count
== 0);
13270 SELF_CHECK (arm_record
.reg_rec_count
== 1);
13271 SELF_CHECK (arm_record
.arm_regs
[0] == 3);
13273 arm_record
.this_addr
+= 2;
13274 ret
= decode_insn (reader
, &arm_record
, THUMB_RECORD
,
13275 THUMB_INSN_SIZE_BYTES
);
13277 SELF_CHECK (ret
== 0);
13278 SELF_CHECK (arm_record
.mem_rec_count
== 0);
13279 SELF_CHECK (arm_record
.reg_rec_count
== 1);
13280 SELF_CHECK (arm_record
.arm_regs
[0] == 5);
13283 /* 32-bit Thumb-2 instructions. */
13285 insn_decode_record arm_record
;
13287 memset (&arm_record
, 0, sizeof (insn_decode_record
));
13288 arm_record
.gdbarch
= gdbarch
;
13290 static const uint16_t insns
[] = {
13291 /* 1d ee 70 7f mrc 15, 0, r7, cr13, cr0, {3} */
13295 enum bfd_endian endian
= gdbarch_byte_order_for_code (arm_record
.gdbarch
);
13296 instruction_reader_thumb
reader (endian
, insns
);
13297 int ret
= decode_insn (reader
, &arm_record
, THUMB2_RECORD
,
13298 THUMB2_INSN_SIZE_BYTES
);
13300 SELF_CHECK (ret
== 0);
13301 SELF_CHECK (arm_record
.mem_rec_count
== 0);
13302 SELF_CHECK (arm_record
.reg_rec_count
== 1);
13303 SELF_CHECK (arm_record
.arm_regs
[0] == 7);
13306 } // namespace selftests
13307 #endif /* GDB_SELF_TEST */
13309 /* Cleans up local record registers and memory allocations. */
13312 deallocate_reg_mem (insn_decode_record
*record
)
13314 xfree (record
->arm_regs
);
13315 xfree (record
->arm_mems
);
13319 /* Parse the current instruction and record the values of the registers and
13320 memory that will be changed in current instruction to record_arch_list".
13321 Return -1 if something is wrong. */
13324 arm_process_record (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
13325 CORE_ADDR insn_addr
)
13328 uint32_t no_of_rec
= 0;
13329 uint32_t ret
= 0; /* return value: -1:record failure ; 0:success */
13330 ULONGEST t_bit
= 0, insn_id
= 0;
13332 ULONGEST u_regval
= 0;
13334 insn_decode_record arm_record
;
13336 memset (&arm_record
, 0, sizeof (insn_decode_record
));
13337 arm_record
.regcache
= regcache
;
13338 arm_record
.this_addr
= insn_addr
;
13339 arm_record
.gdbarch
= gdbarch
;
13342 if (record_debug
> 1)
13344 fprintf_unfiltered (gdb_stdlog
, "Process record: arm_process_record "
13346 paddress (gdbarch
, arm_record
.this_addr
));
13349 instruction_reader reader
;
13350 if (extract_arm_insn (reader
, &arm_record
, 2))
13354 printf_unfiltered (_("Process record: error reading memory at "
13355 "addr %s len = %d.\n"),
13356 paddress (arm_record
.gdbarch
,
13357 arm_record
.this_addr
), 2);
13362 /* Check the insn, whether it is thumb or arm one. */
13364 t_bit
= arm_psr_thumb_bit (arm_record
.gdbarch
);
13365 regcache_raw_read_unsigned (arm_record
.regcache
, ARM_PS_REGNUM
, &u_regval
);
13368 if (!(u_regval
& t_bit
))
13370 /* We are decoding arm insn. */
13371 ret
= decode_insn (reader
, &arm_record
, ARM_RECORD
, ARM_INSN_SIZE_BYTES
);
13375 insn_id
= bits (arm_record
.arm_insn
, 11, 15);
13376 /* is it thumb2 insn? */
13377 if ((0x1D == insn_id
) || (0x1E == insn_id
) || (0x1F == insn_id
))
13379 ret
= decode_insn (reader
, &arm_record
, THUMB2_RECORD
,
13380 THUMB2_INSN_SIZE_BYTES
);
13384 /* We are decoding thumb insn. */
13385 ret
= decode_insn (reader
, &arm_record
, THUMB_RECORD
,
13386 THUMB_INSN_SIZE_BYTES
);
13392 /* Record registers. */
13393 record_full_arch_list_add_reg (arm_record
.regcache
, ARM_PC_REGNUM
);
13394 if (arm_record
.arm_regs
)
13396 for (no_of_rec
= 0; no_of_rec
< arm_record
.reg_rec_count
; no_of_rec
++)
13398 if (record_full_arch_list_add_reg
13399 (arm_record
.regcache
, arm_record
.arm_regs
[no_of_rec
]))
13403 /* Record memories. */
13404 if (arm_record
.arm_mems
)
13406 for (no_of_rec
= 0; no_of_rec
< arm_record
.mem_rec_count
; no_of_rec
++)
13408 if (record_full_arch_list_add_mem
13409 ((CORE_ADDR
)arm_record
.arm_mems
[no_of_rec
].addr
,
13410 arm_record
.arm_mems
[no_of_rec
].len
))
13415 if (record_full_arch_list_add_end ())
13420 deallocate_reg_mem (&arm_record
);