1 /* Target-dependent code for SPARC.
3 Copyright 2003, 2004 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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #include "arch-utils.h"
25 #include "floatformat.h"
27 #include "frame-base.h"
28 #include "frame-unwind.h"
39 #include "gdb_assert.h"
40 #include "gdb_string.h"
42 #include "sparc-tdep.h"
46 /* This file implements the The SPARC 32-bit ABI as defined by the
47 section "Low-Level System Information" of the SPARC Compliance
48 Definition (SCD) 2.4.1, which is the 32-bit System V psABI for
49 SPARC. The SCD lists changes with respect to the origional 32-bit
50 psABI as defined in the "System V ABI, SPARC Processor
53 Note that if we talk about SunOS, we mean SunOS 4.x, which was
54 BSD-based, which is sometimes (retroactively?) referred to as
55 Solaris 1.x. If we talk about Solaris we mean Solaris 2.x and
56 above (Solaris 7, 8 and 9 are nothing but Solaris 2.7, 2.8 and 2.9
57 suffering from severe version number inflation). Solaris 2.x is
58 also known as SunOS 5.x, since that's what uname(1) says. Solaris
61 /* Please use the sparc32_-prefix for 32-bit specific code, the
62 sparc64_-prefix for 64-bit specific code and the sparc_-prefix for
63 code that can handle both. The 64-bit specific code lives in
64 sparc64-tdep.c; don't add any here. */
66 /* The SPARC Floating-Point Quad-Precision format is similar to
67 big-endian IA-64 Quad-recision format. */
68 #define floatformat_sparc_quad floatformat_ia64_quad_big
70 /* The stack pointer is offset from the stack frame by a BIAS of 2047
71 (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC
72 hosts, so undefine it first. */
76 /* Macros to extract fields from SPARC instructions. */
77 #define X_OP(i) (((i) >> 30) & 0x3)
78 #define X_RD(i) (((i) >> 25) & 0x1f)
79 #define X_A(i) (((i) >> 29) & 1)
80 #define X_COND(i) (((i) >> 25) & 0xf)
81 #define X_OP2(i) (((i) >> 22) & 0x7)
82 #define X_IMM22(i) ((i) & 0x3fffff)
83 #define X_OP3(i) (((i) >> 19) & 0x3f)
84 #define X_I(i) (((i) >> 13) & 1)
85 /* Sign extension macros. */
86 #define X_DISP22(i) ((X_IMM22 (i) ^ 0x200000) - 0x200000)
87 #define X_DISP19(i) ((((i) & 0x7ffff) ^ 0x40000) - 0x40000)
89 /* Fetch the instruction at PC. Instructions are always big-endian
90 even if the processor operates in little-endian mode. */
93 sparc_fetch_instruction (CORE_ADDR pc
)
99 /* If we can't read the instruction at PC, return zero. */
100 if (target_read_memory (pc
, buf
, sizeof (buf
)))
104 for (i
= 0; i
< sizeof (buf
); i
++)
105 insn
= (insn
<< 8) | buf
[i
];
110 /* OpenBSD/sparc includes StackGhost, which according to the author's
111 website http://stackghost.cerias.purdue.edu "... transparently and
112 automatically protects applications' stack frames; more
113 specifically, it guards the return pointers. The protection
114 mechanisms require no application source or binary modification and
115 imposes only a negligible performance penalty."
117 The same website provides the following description of how
120 "StackGhost interfaces with the kernel trap handler that would
121 normally write out registers to the stack and the handler that
122 would read them back in. By XORing a cookie into the
123 return-address saved in the user stack when it is actually written
124 to the stack, and then XOR it out when the return-address is pulled
125 from the stack, StackGhost can cause attacker corrupted return
126 pointers to behave in a manner the attacker cannot predict.
127 StackGhost can also use several unused bits in the return pointer
128 to detect a smashed return pointer and abort the process."
130 For GDB this means that whenever we're reading %i7 from a stack
131 frame's window save area, we'll have to XOR the cookie.
133 More information on StackGuard can be found on in:
135 Mike Frantzen and Mike Shuey. "StackGhost: Hardware Facilitated
136 Stack Protection." 2001. Published in USENIX Security Symposium
139 /* Fetch StackGhost Per-Process XOR cookie. */
142 sparc_fetch_wcookie (void)
144 /* FIXME: kettenis/20040131: We should fetch the cookie from the
145 target. For now, return zero, which is right for targets without
151 /* Return the contents if register REGNUM as an address. */
154 sparc_address_from_register (int regnum
)
158 regcache_cooked_read_unsigned (current_regcache
, regnum
, &addr
);
163 /* The functions on this page are intended to be used to classify
164 function arguments. */
166 /* Check whether TYPE is "Integral or Pointer". */
169 sparc_integral_or_pointer_p (const struct type
*type
)
171 switch (TYPE_CODE (type
))
177 case TYPE_CODE_RANGE
:
179 /* We have byte, half-word, word and extended-word/doubleword
180 integral types. The doubleword is an extension to the
181 origional 32-bit ABI by the SCD 2.4.x. */
182 int len
= TYPE_LENGTH (type
);
183 return (len
== 1 || len
== 2 || len
== 4 || len
== 8);
189 /* Allow either 32-bit or 64-bit pointers. */
190 int len
= TYPE_LENGTH (type
);
191 return (len
== 4 || len
== 8);
201 /* Check whether TYPE is "Floating". */
204 sparc_floating_p (const struct type
*type
)
206 switch (TYPE_CODE (type
))
210 int len
= TYPE_LENGTH (type
);
211 return (len
== 4 || len
== 8 || len
== 16);
220 /* Check whether TYPE is "Structure or Union". */
223 sparc_structure_or_union_p (const struct type
*type
)
225 switch (TYPE_CODE (type
))
227 case TYPE_CODE_STRUCT
:
228 case TYPE_CODE_UNION
:
237 /* Register information. */
239 static const char *sparc32_register_names
[] =
241 "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
242 "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
243 "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
244 "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7",
246 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
247 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
248 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
249 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
251 "y", "psr", "wim", "tbr", "pc", "npc", "fsr", "csr"
254 /* Total number of registers. */
255 #define SPARC32_NUM_REGS ARRAY_SIZE (sparc32_register_names)
257 /* We provide the aliases %d0..%d30 for the floating registers as
258 "psuedo" registers. */
260 static const char *sparc32_pseudo_register_names
[] =
262 "d0", "d2", "d4", "d6", "d8", "d10", "d12", "d14",
263 "d16", "d18", "d20", "d22", "d24", "d26", "d28", "d30"
266 /* Total number of pseudo registers. */
267 #define SPARC32_NUM_PSEUDO_REGS ARRAY_SIZE (sparc32_pseudo_register_names)
269 /* Return the name of register REGNUM. */
272 sparc32_register_name (int regnum
)
274 if (regnum
>= 0 && regnum
< SPARC32_NUM_REGS
)
275 return sparc32_register_names
[regnum
];
277 if (regnum
< SPARC32_NUM_REGS
+ SPARC32_NUM_PSEUDO_REGS
)
278 return sparc32_pseudo_register_names
[regnum
- SPARC32_NUM_REGS
];
283 /* Return the GDB type object for the "standard" data type of data in
287 sparc32_register_type (struct gdbarch
*gdbarch
, int regnum
)
289 if (regnum
>= SPARC_F0_REGNUM
&& regnum
<= SPARC_F31_REGNUM
)
290 return builtin_type_float
;
292 if (regnum
>= SPARC32_D0_REGNUM
&& regnum
<= SPARC32_D30_REGNUM
)
293 return builtin_type_double
;
295 if (regnum
== SPARC_SP_REGNUM
|| regnum
== SPARC_FP_REGNUM
)
296 return builtin_type_void_data_ptr
;
298 if (regnum
== SPARC32_PC_REGNUM
|| regnum
== SPARC32_NPC_REGNUM
)
299 return builtin_type_void_func_ptr
;
301 return builtin_type_int32
;
305 sparc32_pseudo_register_read (struct gdbarch
*gdbarch
,
306 struct regcache
*regcache
,
307 int regnum
, void *buf
)
309 gdb_assert (regnum
>= SPARC32_D0_REGNUM
&& regnum
<= SPARC32_D30_REGNUM
);
311 regnum
= SPARC_F0_REGNUM
+ 2 * (regnum
- SPARC32_D0_REGNUM
);
312 regcache_raw_read (regcache
, regnum
, buf
);
313 regcache_raw_read (regcache
, regnum
+ 1, ((char *)buf
) + 4);
317 sparc32_pseudo_register_write (struct gdbarch
*gdbarch
,
318 struct regcache
*regcache
,
319 int regnum
, const void *buf
)
321 gdb_assert (regnum
>= SPARC32_D0_REGNUM
&& regnum
<= SPARC32_D30_REGNUM
);
323 regnum
= SPARC_F0_REGNUM
+ 2 * (regnum
- SPARC32_D0_REGNUM
);
324 regcache_raw_write (regcache
, regnum
, buf
);
325 regcache_raw_write (regcache
, regnum
+ 1, ((const char *)buf
) + 4);
330 sparc32_push_dummy_code (struct gdbarch
*gdbarch
, CORE_ADDR sp
,
331 CORE_ADDR funcaddr
, int using_gcc
,
332 struct value
**args
, int nargs
,
333 struct type
*value_type
,
334 CORE_ADDR
*real_pc
, CORE_ADDR
*bp_addr
)
339 if (using_struct_return (value_type
, using_gcc
))
343 /* This is an UNIMP instruction. */
344 store_unsigned_integer (buf
, 4, TYPE_LENGTH (value_type
) & 0x1fff);
345 write_memory (sp
- 8, buf
, 4);
353 sparc32_store_arguments (struct regcache
*regcache
, int nargs
,
354 struct value
**args
, CORE_ADDR sp
,
355 int struct_return
, CORE_ADDR struct_addr
)
357 /* Number of words in the "parameter array". */
358 int num_elements
= 0;
362 for (i
= 0; i
< nargs
; i
++)
364 struct type
*type
= VALUE_TYPE (args
[i
]);
365 int len
= TYPE_LENGTH (type
);
367 if (sparc_structure_or_union_p (type
)
368 || (sparc_floating_p (type
) && len
== 16))
370 /* Structure, Union and Quad-Precision Arguments. */
373 /* Use doubleword alignment for these values. That's always
374 correct, and wasting a few bytes shouldn't be a problem. */
377 write_memory (sp
, VALUE_CONTENTS (args
[i
]), len
);
378 args
[i
] = value_from_pointer (lookup_pointer_type (type
), sp
);
381 else if (sparc_floating_p (type
))
383 /* Floating arguments. */
384 gdb_assert (len
== 4 || len
== 8);
385 num_elements
+= (len
/ 4);
389 /* Integral and pointer arguments. */
390 gdb_assert (sparc_integral_or_pointer_p (type
));
393 args
[i
] = value_cast (builtin_type_int32
, args
[i
]);
394 num_elements
+= ((len
+ 3) / 4);
398 /* Always allocate at least six words. */
399 sp
-= max (6, num_elements
) * 4;
401 /* The psABI says that "Software convention requires space for the
402 struct/union return value pointer, even if the word is unused." */
405 /* The psABI says that "Although software convention and the
406 operating system require every stack frame to be doubleword
410 for (i
= 0; i
< nargs
; i
++)
412 char *valbuf
= VALUE_CONTENTS (args
[i
]);
413 struct type
*type
= VALUE_TYPE (args
[i
]);
414 int len
= TYPE_LENGTH (type
);
416 gdb_assert (len
== 4 || len
== 8);
420 int regnum
= SPARC_O0_REGNUM
+ element
;
422 regcache_cooked_write (regcache
, regnum
, valbuf
);
423 if (len
> 4 && element
< 5)
424 regcache_cooked_write (regcache
, regnum
+ 1, valbuf
+ 4);
427 /* Always store the argument in memory. */
428 write_memory (sp
+ 4 + element
* 4, valbuf
, len
);
432 gdb_assert (element
== num_elements
);
438 store_unsigned_integer (buf
, 4, struct_addr
);
439 write_memory (sp
, buf
, 4);
446 sparc32_push_dummy_call (struct gdbarch
*gdbarch
, CORE_ADDR func_addr
,
447 struct regcache
*regcache
, CORE_ADDR bp_addr
,
448 int nargs
, struct value
**args
, CORE_ADDR sp
,
449 int struct_return
, CORE_ADDR struct_addr
)
451 CORE_ADDR call_pc
= (struct_return
? (bp_addr
- 12) : (bp_addr
- 8));
453 /* Set return address. */
454 regcache_cooked_write_unsigned (regcache
, SPARC_O7_REGNUM
, call_pc
);
456 /* Set up function arguments. */
457 sp
= sparc32_store_arguments (regcache
, nargs
, args
, sp
,
458 struct_return
, struct_addr
);
460 /* Allocate the 16-word window save area. */
463 /* Stack should be doubleword aligned at this point. */
464 gdb_assert (sp
% 8 == 0);
466 /* Finally, update the stack pointer. */
467 regcache_cooked_write_unsigned (regcache
, SPARC_SP_REGNUM
, sp
);
473 /* Use the program counter to determine the contents and size of a
474 breakpoint instruction. Return a pointer to a string of bytes that
475 encode a breakpoint instruction, store the length of the string in
476 *LEN and optionally adjust *PC to point to the correct memory
477 location for inserting the breakpoint. */
479 static const unsigned char *
480 sparc_breakpoint_from_pc (CORE_ADDR
*pc
, int *len
)
482 static unsigned char break_insn
[] = { 0x91, 0xd0, 0x20, 0x01 };
484 *len
= sizeof (break_insn
);
489 /* Allocate and initialize a frame cache. */
491 static struct sparc_frame_cache
*
492 sparc_alloc_frame_cache (void)
494 struct sparc_frame_cache
*cache
;
497 cache
= FRAME_OBSTACK_ZALLOC (struct sparc_frame_cache
);
503 /* Frameless until proven otherwise. */
504 cache
->frameless_p
= 1;
506 cache
->struct_return_p
= 0;
512 sparc_analyze_prologue (CORE_ADDR pc
, CORE_ADDR current_pc
,
513 struct sparc_frame_cache
*cache
)
515 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
520 if (current_pc
<= pc
)
523 /* We have to handle to "Procedure Linkage Table" (PLT) special. On
524 SPARC the linker usually defines a symbol (typically
525 _PROCEDURE_LINKAGE_TABLE_) at the start of the .plt section.
526 This symbol makes us end up here with PC pointing at the start of
527 the PLT and CURRENT_PC probably pointing at a PLT entry. If we
528 would do our normal prologue analysis, we would probably conclude
529 that we've got a frame when in reality we don't, since the
530 dynamic linker patches up the first PLT with some code that
531 starts with a SAVE instruction. Patch up PC such that it points
532 at the start of our PLT entry. */
533 if (tdep
->plt_entry_size
> 0 && in_plt_section (current_pc
, NULL
))
534 pc
= current_pc
- ((current_pc
- pc
) % tdep
->plt_entry_size
);
536 insn
= sparc_fetch_instruction (pc
);
538 /* Recognize a SETHI insn and record its destination. */
539 if (X_OP (insn
) == 0 && X_OP2 (insn
) == 0x04)
544 insn
= sparc_fetch_instruction (pc
+ 4);
547 /* Allow for an arithmetic operation on DEST or %g1. */
548 if (X_OP (insn
) == 2 && X_I (insn
)
549 && (X_RD (insn
) == 1 || X_RD (insn
) == dest
))
553 insn
= sparc_fetch_instruction (pc
+ 8);
556 /* Check for the SAVE instruction that sets up the frame. */
557 if (X_OP (insn
) == 2 && X_OP3 (insn
) == 0x3c)
559 cache
->frameless_p
= 0;
560 return pc
+ offset
+ 4;
567 sparc_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
569 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
570 return frame_unwind_register_unsigned (next_frame
, tdep
->pc_regnum
);
573 /* Return PC of first real instruction of the function starting at
577 sparc32_skip_prologue (CORE_ADDR start_pc
)
579 struct symtab_and_line sal
;
580 CORE_ADDR func_start
, func_end
;
581 struct sparc_frame_cache cache
;
583 /* This is the preferred method, find the end of the prologue by
584 using the debugging information. */
585 if (find_pc_partial_function (start_pc
, NULL
, &func_start
, &func_end
))
587 sal
= find_pc_line (func_start
, 0);
589 if (sal
.end
< func_end
590 && start_pc
<= sal
.end
)
594 return sparc_analyze_prologue (start_pc
, 0xffffffffUL
, &cache
);
599 struct sparc_frame_cache
*
600 sparc_frame_cache (struct frame_info
*next_frame
, void **this_cache
)
602 struct sparc_frame_cache
*cache
;
607 cache
= sparc_alloc_frame_cache ();
610 /* In priciple, for normal frames, %fp (%i6) holds the frame
611 pointer, which holds the base address for the current stack
614 cache
->base
= frame_unwind_register_unsigned (next_frame
, SPARC_FP_REGNUM
);
615 if (cache
->base
== 0)
618 cache
->pc
= frame_func_unwind (next_frame
);
621 CORE_ADDR addr_in_block
= frame_unwind_address_in_block (next_frame
);
622 sparc_analyze_prologue (cache
->pc
, addr_in_block
, cache
);
625 if (cache
->frameless_p
)
627 /* We didn't find a valid frame, which means that CACHE->base
628 currently holds the frame pointer for our calling frame. */
629 cache
->base
= frame_unwind_register_unsigned (next_frame
,
636 struct sparc_frame_cache
*
637 sparc32_frame_cache (struct frame_info
*next_frame
, void **this_cache
)
639 struct sparc_frame_cache
*cache
;
645 cache
= sparc_frame_cache (next_frame
, this_cache
);
647 sym
= find_pc_function (cache
->pc
);
650 struct type
*type
= check_typedef (SYMBOL_TYPE (sym
));
651 enum type_code code
= TYPE_CODE (type
);
653 if (code
== TYPE_CODE_FUNC
|| code
== TYPE_CODE_METHOD
)
655 type
= check_typedef (TYPE_TARGET_TYPE (type
));
656 if (sparc_structure_or_union_p (type
)
657 || (sparc_floating_p (type
) && TYPE_LENGTH (type
) == 16))
658 cache
->struct_return_p
= 1;
666 sparc32_frame_this_id (struct frame_info
*next_frame
, void **this_cache
,
667 struct frame_id
*this_id
)
669 struct sparc_frame_cache
*cache
=
670 sparc32_frame_cache (next_frame
, this_cache
);
672 /* This marks the outermost frame. */
673 if (cache
->base
== 0)
676 (*this_id
) = frame_id_build (cache
->base
, cache
->pc
);
680 sparc32_frame_prev_register (struct frame_info
*next_frame
, void **this_cache
,
681 int regnum
, int *optimizedp
,
682 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
683 int *realnump
, void *valuep
)
685 struct sparc_frame_cache
*cache
=
686 sparc32_frame_cache (next_frame
, this_cache
);
688 if (regnum
== SPARC32_PC_REGNUM
|| regnum
== SPARC32_NPC_REGNUM
)
696 CORE_ADDR pc
= (regnum
== SPARC32_NPC_REGNUM
) ? 4 : 0;
698 /* If this functions has a Structure, Union or
699 Quad-Precision return value, we have to skip the UNIMP
700 instruction that encodes the size of the structure. */
701 if (cache
->struct_return_p
)
704 regnum
= cache
->frameless_p
? SPARC_O7_REGNUM
: SPARC_I7_REGNUM
;
705 pc
+= frame_unwind_register_unsigned (next_frame
, regnum
) + 8;
706 store_unsigned_integer (valuep
, 4, pc
);
711 /* Handle StackGhost. */
713 ULONGEST wcookie
= sparc_fetch_wcookie ();
715 if (wcookie
!= 0 && !cache
->frameless_p
&& regnum
== SPARC_I7_REGNUM
)
723 CORE_ADDR addr
= cache
->base
+ (regnum
- SPARC_L0_REGNUM
) * 4;
726 /* Read the value in from memory. */
727 i6
= get_frame_memory_unsigned (next_frame
, addr
, 4);
728 store_unsigned_integer (valuep
, 4, i6
^ wcookie
);
734 /* The previous frame's `local' and `in' registers have been saved
735 in the register save area. */
736 if (!cache
->frameless_p
737 && regnum
>= SPARC_L0_REGNUM
&& regnum
<= SPARC_I7_REGNUM
)
740 *lvalp
= lval_memory
;
741 *addrp
= cache
->base
+ (regnum
- SPARC_L0_REGNUM
) * 4;
745 struct gdbarch
*gdbarch
= get_frame_arch (next_frame
);
747 /* Read the value in from memory. */
748 read_memory (*addrp
, valuep
, register_size (gdbarch
, regnum
));
753 /* The previous frame's `out' registers are accessable as the
754 current frame's `in' registers. */
755 if (!cache
->frameless_p
756 && regnum
>= SPARC_O0_REGNUM
&& regnum
<= SPARC_O7_REGNUM
)
757 regnum
+= (SPARC_I0_REGNUM
- SPARC_O0_REGNUM
);
759 frame_register_unwind (next_frame
, regnum
,
760 optimizedp
, lvalp
, addrp
, realnump
, valuep
);
763 static const struct frame_unwind sparc32_frame_unwind
=
766 sparc32_frame_this_id
,
767 sparc32_frame_prev_register
770 static const struct frame_unwind
*
771 sparc32_frame_sniffer (struct frame_info
*next_frame
)
773 return &sparc32_frame_unwind
;
778 sparc32_frame_base_address (struct frame_info
*next_frame
, void **this_cache
)
780 struct sparc_frame_cache
*cache
=
781 sparc32_frame_cache (next_frame
, this_cache
);
786 static const struct frame_base sparc32_frame_base
=
788 &sparc32_frame_unwind
,
789 sparc32_frame_base_address
,
790 sparc32_frame_base_address
,
791 sparc32_frame_base_address
794 static struct frame_id
795 sparc_unwind_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
799 sp
= frame_unwind_register_unsigned (next_frame
, SPARC_SP_REGNUM
);
800 return frame_id_build (sp
, frame_pc_unwind (next_frame
));
804 /* Extract from an array REGBUF containing the (raw) register state, a
805 function return value of TYPE, and copy that into VALBUF. */
808 sparc32_extract_return_value (struct type
*type
, struct regcache
*regcache
,
811 int len
= TYPE_LENGTH (type
);
814 gdb_assert (!sparc_structure_or_union_p (type
));
815 gdb_assert (!(sparc_floating_p (type
) && len
== 16));
817 if (sparc_floating_p (type
))
819 /* Floating return values. */
820 regcache_cooked_read (regcache
, SPARC_F0_REGNUM
, buf
);
822 regcache_cooked_read (regcache
, SPARC_F1_REGNUM
, buf
+ 4);
823 memcpy (valbuf
, buf
, len
);
827 /* Integral and pointer return values. */
828 gdb_assert (sparc_integral_or_pointer_p (type
));
830 regcache_cooked_read (regcache
, SPARC_O0_REGNUM
, buf
);
833 regcache_cooked_read (regcache
, SPARC_O1_REGNUM
, buf
+ 4);
834 gdb_assert (len
== 8);
835 memcpy (valbuf
, buf
, 8);
839 /* Just stripping off any unused bytes should preserve the
840 signed-ness just fine. */
841 memcpy (valbuf
, buf
+ 4 - len
, len
);
846 /* Write into the appropriate registers a function return value stored
847 in VALBUF of type TYPE. */
850 sparc32_store_return_value (struct type
*type
, struct regcache
*regcache
,
853 int len
= TYPE_LENGTH (type
);
856 gdb_assert (!sparc_structure_or_union_p (type
));
857 gdb_assert (!(sparc_floating_p (type
) && len
== 16));
859 if (sparc_floating_p (type
))
861 /* Floating return values. */
862 memcpy (buf
, valbuf
, len
);
863 regcache_cooked_write (regcache
, SPARC_F0_REGNUM
, buf
);
865 regcache_cooked_write (regcache
, SPARC_F1_REGNUM
, buf
+ 4);
869 /* Integral and pointer return values. */
870 gdb_assert (sparc_integral_or_pointer_p (type
));
874 gdb_assert (len
== 8);
875 memcpy (buf
, valbuf
, 8);
876 regcache_cooked_write (regcache
, SPARC_O1_REGNUM
, buf
+ 4);
880 /* ??? Do we need to do any sign-extension here? */
881 memcpy (buf
+ 4 - len
, valbuf
, len
);
883 regcache_cooked_write (regcache
, SPARC_O0_REGNUM
, buf
);
887 static enum return_value_convention
888 sparc32_return_value (struct gdbarch
*gdbarch
, struct type
*type
,
889 struct regcache
*regcache
, void *readbuf
,
890 const void *writebuf
)
892 if (sparc_structure_or_union_p (type
)
893 || (sparc_floating_p (type
) && TYPE_LENGTH (type
) == 16))
894 return RETURN_VALUE_STRUCT_CONVENTION
;
897 sparc32_extract_return_value (type
, regcache
, readbuf
);
899 sparc32_store_return_value (type
, regcache
, writebuf
);
901 return RETURN_VALUE_REGISTER_CONVENTION
;
905 /* NOTE: cagney/2004-01-17: For the moment disable this method. The
906 architecture and CORE-gdb will need new code (and a replacement for
907 DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS) before this can be made to
908 work robustly. Here is a possible function signature: */
909 /* NOTE: cagney/2004-01-17: So far only the 32-bit SPARC ABI has been
910 identifed as having a way to robustly recover the address of a
911 struct-convention return-value (after the function has returned).
912 For all other ABIs so far examined, the calling convention makes no
913 guarenteed that the register containing the return-value will be
914 preserved and hence that the return-value's address can be
916 /* Extract from REGCACHE, which contains the (raw) register state, the
917 address in which a function should return its structure value, as a
921 sparc32_extract_struct_value_address (struct regcache
*regcache
)
925 regcache_cooked_read_unsigned (regcache
, SPARC_SP_REGNUM
, &sp
);
926 return read_memory_unsigned_integer (sp
+ 64, 4);
931 sparc32_stabs_argument_has_addr (struct gdbarch
*gdbarch
, struct type
*type
)
933 return (sparc_structure_or_union_p (type
)
934 || (sparc_floating_p (type
) && TYPE_LENGTH (type
) == 16));
938 /* The SPARC Architecture doesn't have hardware single-step support,
939 and most operating systems don't implement it either, so we provide
940 software single-step mechanism. */
943 sparc_analyze_control_transfer (CORE_ADDR pc
, CORE_ADDR
*npc
)
945 unsigned long insn
= sparc_fetch_instruction (pc
);
946 int conditional_p
= X_COND (insn
) & 0x7;
948 long offset
= 0; /* Must be signed for sign-extend. */
950 if (X_OP (insn
) == 0 && X_OP2 (insn
) == 3 && (insn
& 0x1000000) == 0)
952 /* Branch on Integer Register with Prediction (BPr). */
956 else if (X_OP (insn
) == 0 && X_OP2 (insn
) == 6)
958 /* Branch on Floating-Point Condition Codes (FBfcc). */
960 offset
= 4 * X_DISP22 (insn
);
962 else if (X_OP (insn
) == 0 && X_OP2 (insn
) == 5)
964 /* Branch on Floating-Point Condition Codes with Prediction
967 offset
= 4 * X_DISP19 (insn
);
969 else if (X_OP (insn
) == 0 && X_OP2 (insn
) == 2)
971 /* Branch on Integer Condition Codes (Bicc). */
973 offset
= 4 * X_DISP22 (insn
);
975 else if (X_OP (insn
) == 0 && X_OP2 (insn
) == 1)
977 /* Branch on Integer Condition Codes with Prediction (BPcc). */
979 offset
= 4 * X_DISP19 (insn
);
982 /* FIXME: Handle DONE and RETRY instructions. */
984 /* FIXME: Handle the Trap instruction. */
990 /* For conditional branches, return nPC + 4 iff the annul
992 return (X_A (insn
) ? *npc
+ 4 : 0);
996 /* For unconditional branches, return the target if its
997 specified condition is "always" and return nPC + 4 if the
998 condition is "never". If the annul bit is 1, set *NPC to
1000 if (X_COND (insn
) == 0x0)
1001 pc
= *npc
, offset
= 4;
1005 gdb_assert (offset
!= 0);
1014 sparc_software_single_step (enum target_signal sig
, int insert_breakpoints_p
)
1016 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
1017 static CORE_ADDR npc
, nnpc
;
1018 static char npc_save
[4], nnpc_save
[4];
1020 if (insert_breakpoints_p
)
1024 pc
= sparc_address_from_register (tdep
->pc_regnum
);
1025 npc
= sparc_address_from_register (tdep
->npc_regnum
);
1027 /* Analyze the instruction at PC. */
1028 nnpc
= sparc_analyze_control_transfer (pc
, &npc
);
1030 target_insert_breakpoint (npc
, npc_save
);
1032 target_insert_breakpoint (nnpc
, nnpc_save
);
1034 /* Assert that we have set at least one breakpoint, and that
1035 they're not set at the same spot. */
1036 gdb_assert (npc
!= 0 || nnpc
!= 0);
1037 gdb_assert (nnpc
!= npc
);
1042 target_remove_breakpoint (npc
, npc_save
);
1044 target_remove_breakpoint (nnpc
, nnpc_save
);
1049 sparc_write_pc (CORE_ADDR pc
, ptid_t ptid
)
1051 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
1053 write_register_pid (tdep
->pc_regnum
, pc
, ptid
);
1054 write_register_pid (tdep
->npc_regnum
, pc
+ 4, ptid
);
1057 /* Unglobalize NAME. */
1060 sparc_stabs_unglobalize_name (char *name
)
1062 /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop,
1063 SunPRO) convert file static variables into global values, a
1064 process known as globalization. In order to do this, the
1065 compiler will create a unique prefix and prepend it to each file
1066 static variable. For static variables within a function, this
1067 globalization prefix is followed by the function name (nested
1068 static variables within a function are supposed to generate a
1069 warning message, and are left alone). The procedure is
1070 documented in the Stabs Interface Manual, which is distrubuted
1071 with the compilers, although version 4.0 of the manual seems to
1072 be incorrect in some places, at least for SPARC. The
1073 globalization prefix is encoded into an N_OPT stab, with the form
1074 "G=<prefix>". The globalization prefix always seems to start
1075 with a dollar sign '$'; a dot '.' is used as a seperator. So we
1076 simply strip everything up until the last dot. */
1080 char *p
= strrchr (name
, '.');
1089 /* Return the appropriate register set for the core section identified
1090 by SECT_NAME and SECT_SIZE. */
1092 const struct regset
*
1093 sparc_regset_from_core_section (struct gdbarch
*gdbarch
,
1094 const char *sect_name
, size_t sect_size
)
1096 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1098 if (strcmp (sect_name
, ".reg") == 0 && sect_size
>= tdep
->sizeof_gregset
)
1099 return tdep
->gregset
;
1101 if (strcmp (sect_name
, ".reg2") == 0 && sect_size
>= tdep
->sizeof_fpregset
)
1102 return tdep
->fpregset
;
1108 static struct gdbarch
*
1109 sparc32_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
1111 struct gdbarch_tdep
*tdep
;
1112 struct gdbarch
*gdbarch
;
1114 /* If there is already a candidate, use it. */
1115 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
1117 return arches
->gdbarch
;
1119 /* Allocate space for the new architecture. */
1120 tdep
= XMALLOC (struct gdbarch_tdep
);
1121 gdbarch
= gdbarch_alloc (&info
, tdep
);
1123 tdep
->pc_regnum
= SPARC32_PC_REGNUM
;
1124 tdep
->npc_regnum
= SPARC32_NPC_REGNUM
;
1125 tdep
->gregset
= NULL
;
1126 tdep
->sizeof_gregset
= 0;
1127 tdep
->fpregset
= NULL
;
1128 tdep
->sizeof_fpregset
= 0;
1129 tdep
->plt_entry_size
= 0;
1131 set_gdbarch_long_double_bit (gdbarch
, 128);
1132 set_gdbarch_long_double_format (gdbarch
, &floatformat_sparc_quad
);
1134 set_gdbarch_num_regs (gdbarch
, SPARC32_NUM_REGS
);
1135 set_gdbarch_register_name (gdbarch
, sparc32_register_name
);
1136 set_gdbarch_register_type (gdbarch
, sparc32_register_type
);
1137 set_gdbarch_num_pseudo_regs (gdbarch
, SPARC32_NUM_PSEUDO_REGS
);
1138 set_gdbarch_pseudo_register_read (gdbarch
, sparc32_pseudo_register_read
);
1139 set_gdbarch_pseudo_register_write (gdbarch
, sparc32_pseudo_register_write
);
1141 /* Register numbers of various important registers. */
1142 set_gdbarch_sp_regnum (gdbarch
, SPARC_SP_REGNUM
); /* %sp */
1143 set_gdbarch_pc_regnum (gdbarch
, SPARC32_PC_REGNUM
); /* %pc */
1144 set_gdbarch_fp0_regnum (gdbarch
, SPARC_F0_REGNUM
); /* %f0 */
1146 /* Call dummy code. */
1147 set_gdbarch_call_dummy_location (gdbarch
, ON_STACK
);
1148 set_gdbarch_push_dummy_code (gdbarch
, sparc32_push_dummy_code
);
1149 set_gdbarch_push_dummy_call (gdbarch
, sparc32_push_dummy_call
);
1151 set_gdbarch_return_value (gdbarch
, sparc32_return_value
);
1152 set_gdbarch_stabs_argument_has_addr
1153 (gdbarch
, sparc32_stabs_argument_has_addr
);
1155 set_gdbarch_skip_prologue (gdbarch
, sparc32_skip_prologue
);
1157 /* Stack grows downward. */
1158 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1160 set_gdbarch_breakpoint_from_pc (gdbarch
, sparc_breakpoint_from_pc
);
1162 set_gdbarch_frame_args_skip (gdbarch
, 8);
1164 set_gdbarch_print_insn (gdbarch
, print_insn_sparc
);
1166 set_gdbarch_software_single_step (gdbarch
, sparc_software_single_step
);
1167 set_gdbarch_write_pc (gdbarch
, sparc_write_pc
);
1169 set_gdbarch_unwind_dummy_id (gdbarch
, sparc_unwind_dummy_id
);
1171 set_gdbarch_unwind_pc (gdbarch
, sparc_unwind_pc
);
1173 frame_base_set_default (gdbarch
, &sparc32_frame_base
);
1175 /* Hook in ABI-specific overrides, if they have been registered. */
1176 gdbarch_init_osabi (info
, gdbarch
);
1178 frame_unwind_append_sniffer (gdbarch
, sparc32_frame_sniffer
);
1180 /* If we have register sets, enable the generic core file support. */
1182 set_gdbarch_regset_from_core_section (gdbarch
,
1183 sparc_regset_from_core_section
);
1188 /* Helper functions for dealing with register windows. */
1191 sparc_supply_rwindow (struct regcache
*regcache
, CORE_ADDR sp
, int regnum
)
1199 /* Registers are 64-bit. */
1202 for (i
= SPARC_L0_REGNUM
; i
<= SPARC_I7_REGNUM
; i
++)
1204 if (regnum
== i
|| regnum
== -1)
1206 target_read_memory (sp
+ ((i
- SPARC_L0_REGNUM
) * 8), buf
, 8);
1207 regcache_raw_supply (regcache
, i
, buf
);
1213 /* Registers are 32-bit. Toss any sign-extension of the stack
1217 /* Clear out the top half of the temporary buffer, and put the
1218 register value in the bottom half if we're in 64-bit mode. */
1219 if (gdbarch_ptr_bit (current_gdbarch
) == 64)
1225 for (i
= SPARC_L0_REGNUM
; i
<= SPARC_I7_REGNUM
; i
++)
1227 if (regnum
== i
|| regnum
== -1)
1229 target_read_memory (sp
+ ((i
- SPARC_L0_REGNUM
) * 4),
1232 /* Handle StackGhost. */
1233 if (i
== SPARC_I7_REGNUM
)
1235 ULONGEST wcookie
= sparc_fetch_wcookie ();
1236 ULONGEST i6
= extract_unsigned_integer (buf
+ offset
, 4);
1238 store_unsigned_integer (buf
+ offset
, 4, i6
^ wcookie
);
1241 regcache_raw_supply (regcache
, i
, buf
);
1248 sparc_collect_rwindow (const struct regcache
*regcache
,
1249 CORE_ADDR sp
, int regnum
)
1257 /* Registers are 64-bit. */
1260 for (i
= SPARC_L0_REGNUM
; i
<= SPARC_I7_REGNUM
; i
++)
1262 if (regnum
== -1 || regnum
== SPARC_SP_REGNUM
|| regnum
== i
)
1264 regcache_raw_collect (regcache
, i
, buf
);
1265 target_write_memory (sp
+ ((i
- SPARC_L0_REGNUM
) * 8), buf
, 8);
1271 /* Registers are 32-bit. Toss any sign-extension of the stack
1275 /* Only use the bottom half if we're in 64-bit mode. */
1276 if (gdbarch_ptr_bit (current_gdbarch
) == 64)
1279 for (i
= SPARC_L0_REGNUM
; i
<= SPARC_I7_REGNUM
; i
++)
1281 if (regnum
== -1 || regnum
== SPARC_SP_REGNUM
|| regnum
== i
)
1283 regcache_raw_collect (regcache
, i
, buf
);
1285 /* Handle StackGhost. */
1286 if (i
== SPARC_I7_REGNUM
)
1288 ULONGEST wcookie
= sparc_fetch_wcookie ();
1289 ULONGEST i6
= extract_unsigned_integer (buf
+ offset
, 4);
1291 store_unsigned_integer (buf
+ offset
, 4, i6
^ wcookie
);
1294 target_write_memory (sp
+ ((i
- SPARC_L0_REGNUM
) * 4),
1301 /* Helper functions for dealing with register sets. */
1304 sparc32_supply_gregset (const struct sparc_gregset
*gregset
,
1305 struct regcache
*regcache
,
1306 int regnum
, const void *gregs
)
1308 const char *regs
= gregs
;
1311 if (regnum
== SPARC32_PSR_REGNUM
|| regnum
== -1)
1312 regcache_raw_supply (regcache
, SPARC32_PSR_REGNUM
,
1313 regs
+ gregset
->r_psr_offset
);
1315 if (regnum
== SPARC32_PC_REGNUM
|| regnum
== -1)
1316 regcache_raw_supply (regcache
, SPARC32_PC_REGNUM
,
1317 regs
+ gregset
->r_pc_offset
);
1319 if (regnum
== SPARC32_NPC_REGNUM
|| regnum
== -1)
1320 regcache_raw_supply (regcache
, SPARC32_NPC_REGNUM
,
1321 regs
+ gregset
->r_npc_offset
);
1323 if (regnum
== SPARC32_Y_REGNUM
|| regnum
== -1)
1324 regcache_raw_supply (regcache
, SPARC32_Y_REGNUM
,
1325 regs
+ gregset
->r_y_offset
);
1327 if (regnum
== SPARC_G0_REGNUM
|| regnum
== -1)
1328 regcache_raw_supply (regcache
, SPARC_G0_REGNUM
, NULL
);
1330 if ((regnum
>= SPARC_G1_REGNUM
&& regnum
<= SPARC_O7_REGNUM
) || regnum
== -1)
1332 int offset
= gregset
->r_g1_offset
;
1334 for (i
= SPARC_G1_REGNUM
; i
<= SPARC_O7_REGNUM
; i
++)
1336 if (regnum
== i
|| regnum
== -1)
1337 regcache_raw_supply (regcache
, i
, regs
+ offset
);
1342 if ((regnum
>= SPARC_L0_REGNUM
&& regnum
<= SPARC_I7_REGNUM
) || regnum
== -1)
1344 /* Not all of the register set variants include Locals and
1345 Inputs. For those that don't, we read them off the stack. */
1346 if (gregset
->r_l0_offset
== -1)
1350 regcache_cooked_read_unsigned (regcache
, SPARC_SP_REGNUM
, &sp
);
1351 sparc_supply_rwindow (regcache
, sp
, regnum
);
1355 int offset
= gregset
->r_l0_offset
;
1357 for (i
= SPARC_L0_REGNUM
; i
<= SPARC_I7_REGNUM
; i
++)
1359 if (regnum
== i
|| regnum
== -1)
1360 regcache_raw_supply (regcache
, i
, regs
+ offset
);
1368 sparc32_collect_gregset (const struct sparc_gregset
*gregset
,
1369 const struct regcache
*regcache
,
1370 int regnum
, void *gregs
)
1375 if (regnum
== SPARC32_PSR_REGNUM
|| regnum
== -1)
1376 regcache_raw_collect (regcache
, SPARC32_PSR_REGNUM
,
1377 regs
+ gregset
->r_psr_offset
);
1379 if (regnum
== SPARC32_PC_REGNUM
|| regnum
== -1)
1380 regcache_raw_collect (regcache
, SPARC32_PC_REGNUM
,
1381 regs
+ gregset
->r_pc_offset
);
1383 if (regnum
== SPARC32_NPC_REGNUM
|| regnum
== -1)
1384 regcache_raw_collect (regcache
, SPARC32_NPC_REGNUM
,
1385 regs
+ gregset
->r_npc_offset
);
1387 if (regnum
== SPARC32_Y_REGNUM
|| regnum
== -1)
1388 regcache_raw_collect (regcache
, SPARC32_Y_REGNUM
,
1389 regs
+ gregset
->r_y_offset
);
1391 if ((regnum
>= SPARC_G1_REGNUM
&& regnum
<= SPARC_O7_REGNUM
) || regnum
== -1)
1393 int offset
= gregset
->r_g1_offset
;
1395 /* %g0 is always zero. */
1396 for (i
= SPARC_G1_REGNUM
; i
<= SPARC_O7_REGNUM
; i
++)
1398 if (regnum
== i
|| regnum
== -1)
1399 regcache_raw_collect (regcache
, i
, regs
+ offset
);
1404 if ((regnum
>= SPARC_L0_REGNUM
&& regnum
<= SPARC_I7_REGNUM
) || regnum
== -1)
1406 /* Not all of the register set variants include Locals and
1407 Inputs. For those that don't, we read them off the stack. */
1408 if (gregset
->r_l0_offset
!= -1)
1410 int offset
= gregset
->r_l0_offset
;
1412 for (i
= SPARC_L0_REGNUM
; i
<= SPARC_I7_REGNUM
; i
++)
1414 if (regnum
== i
|| regnum
== -1)
1415 regcache_raw_collect (regcache
, i
, regs
+ offset
);
1423 sparc32_supply_fpregset (struct regcache
*regcache
,
1424 int regnum
, const void *fpregs
)
1426 const char *regs
= fpregs
;
1429 for (i
= 0; i
< 32; i
++)
1431 if (regnum
== (SPARC_F0_REGNUM
+ i
) || regnum
== -1)
1432 regcache_raw_supply (regcache
, SPARC_F0_REGNUM
+ i
, regs
+ (i
* 4));
1435 if (regnum
== SPARC32_FSR_REGNUM
|| regnum
== -1)
1436 regcache_raw_supply (regcache
, SPARC32_FSR_REGNUM
, regs
+ (32 * 4) + 4);
1440 sparc32_collect_fpregset (const struct regcache
*regcache
,
1441 int regnum
, void *fpregs
)
1443 char *regs
= fpregs
;
1446 for (i
= 0; i
< 32; i
++)
1448 if (regnum
== (SPARC_F0_REGNUM
+ i
) || regnum
== -1)
1449 regcache_raw_collect (regcache
, SPARC_F0_REGNUM
+ i
, regs
+ (i
* 4));
1452 if (regnum
== SPARC32_FSR_REGNUM
|| regnum
== -1)
1453 regcache_raw_collect (regcache
, SPARC32_FSR_REGNUM
, regs
+ (32 * 4) + 4);
1459 /* From <machine/reg.h>. */
1460 const struct sparc_gregset sparc32_sunos4_gregset
=
1473 /* Provide a prototype to silence -Wmissing-prototypes. */
1474 void _initialize_sparc_tdep (void);
1477 _initialize_sparc_tdep (void)
1479 register_gdbarch_init (bfd_arch_sparc
, sparc32_gdbarch_init
);