1 /* Target-dependent code for the Texas Instruments MSP430 for GDB, the
4 Copyright (C) 2012-2017 Free Software Foundation, Inc.
6 Contributed by Red Hat, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "arch-utils.h"
25 #include "prologue-value.h"
31 #include "frame-unwind.h"
32 #include "frame-base.h"
35 #include "dwarf2-frame.h"
36 #include "reggroups.h"
38 #include "elf/msp430.h"
39 #include "opcode/msp430-decode.h"
42 /* Register Numbers. */
56 MSP430_R10_RAW_REGNUM
,
57 MSP430_R11_RAW_REGNUM
,
58 MSP430_R12_RAW_REGNUM
,
59 MSP430_R13_RAW_REGNUM
,
60 MSP430_R14_RAW_REGNUM
,
61 MSP430_R15_RAW_REGNUM
,
65 MSP430_PC_REGNUM
= MSP430_NUM_REGS
,
82 MSP430_NUM_TOTAL_REGS
,
83 MSP430_NUM_PSEUDO_REGS
= MSP430_NUM_TOTAL_REGS
- MSP430_NUM_REGS
88 /* TI MSP430 Architecture. */
91 /* TI MSP430X Architecture. */
97 /* The small code model limits code addresses to 16 bits. */
100 /* The large code model uses 20 bit addresses for function
101 pointers. These are stored in memory using four bytes (32 bits). */
105 /* Architecture specific data. */
109 /* The ELF header flags specify the multilib used. */
112 /* One of MSP_ISA_MSP430 or MSP_ISA_MSP430X. */
115 /* One of MSP_SMALL_CODE_MODEL or MSP_LARGE_CODE_MODEL. If, at
116 some point, we support different data models too, we'll probably
117 structure things so that we can combine values using logical
122 /* This structure holds the results of a prologue analysis. */
124 struct msp430_prologue
126 /* The offset from the frame base to the stack pointer --- always
129 Calling this a "size" is a bit misleading, but given that the
130 stack grows downwards, using offsets for everything keeps one
131 from going completely sign-crazy: you never change anything's
132 sign for an ADD instruction; always change the second operand's
133 sign for a SUB instruction; and everything takes care of
137 /* Non-zero if this function has initialized the frame pointer from
138 the stack pointer, zero otherwise. */
141 /* If has_frame_ptr is non-zero, this is the offset from the frame
142 base to where the frame pointer points. This is always zero or
144 int frame_ptr_offset
;
146 /* The address of the first instruction at which the frame has been
147 set up and the arguments are where the debug info says they are
148 --- as best as we can tell. */
149 CORE_ADDR prologue_end
;
151 /* reg_offset[R] is the offset from the CFA at which register R is
152 saved, or 1 if register R has not been saved. (Real values are
153 always zero or negative.) */
154 int reg_offset
[MSP430_NUM_TOTAL_REGS
];
157 /* Implement the "register_type" gdbarch method. */
160 msp430_register_type (struct gdbarch
*gdbarch
, int reg_nr
)
162 if (reg_nr
< MSP430_NUM_REGS
)
163 return builtin_type (gdbarch
)->builtin_uint32
;
164 else if (reg_nr
== MSP430_PC_REGNUM
)
165 return builtin_type (gdbarch
)->builtin_func_ptr
;
167 return builtin_type (gdbarch
)->builtin_uint16
;
170 /* Implement another version of the "register_type" gdbarch method
174 msp430x_register_type (struct gdbarch
*gdbarch
, int reg_nr
)
176 if (reg_nr
< MSP430_NUM_REGS
)
177 return builtin_type (gdbarch
)->builtin_uint32
;
178 else if (reg_nr
== MSP430_PC_REGNUM
)
179 return builtin_type (gdbarch
)->builtin_func_ptr
;
181 return builtin_type (gdbarch
)->builtin_uint32
;
184 /* Implement the "register_name" gdbarch method. */
187 msp430_register_name (struct gdbarch
*gdbarch
, int regnr
)
189 static const char *const reg_names
[] = {
191 "", "", "", "", "", "", "", "",
192 "", "", "", "", "", "", "", "",
193 /* Pseudo registers. */
194 "pc", "sp", "sr", "cg", "r4", "r5", "r6", "r7",
195 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
198 return reg_names
[regnr
];
201 /* Implement the "register_reggroup_p" gdbarch method. */
204 msp430_register_reggroup_p (struct gdbarch
*gdbarch
, int regnum
,
205 struct reggroup
*group
)
207 if (group
== all_reggroup
)
210 /* All other registers are saved and restored. */
211 if (group
== save_reggroup
|| group
== restore_reggroup
)
212 return (MSP430_NUM_REGS
<= regnum
&& regnum
< MSP430_NUM_TOTAL_REGS
);
214 return group
== general_reggroup
;
217 /* Implement the "pseudo_register_read" gdbarch method. */
219 static enum register_status
220 msp430_pseudo_register_read (struct gdbarch
*gdbarch
,
221 struct regcache
*regcache
,
222 int regnum
, gdb_byte
*buffer
)
224 if (MSP430_NUM_REGS
<= regnum
&& regnum
< MSP430_NUM_TOTAL_REGS
)
226 enum register_status status
;
228 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
229 int regsize
= register_size (gdbarch
, regnum
);
230 int raw_regnum
= regnum
- MSP430_NUM_REGS
;
232 status
= regcache_raw_read_unsigned (regcache
, raw_regnum
, &val
);
233 if (status
== REG_VALID
)
234 store_unsigned_integer (buffer
, regsize
, byte_order
, val
);
239 gdb_assert_not_reached ("invalid pseudo register number");
242 /* Implement the "pseudo_register_write" gdbarch method. */
245 msp430_pseudo_register_write (struct gdbarch
*gdbarch
,
246 struct regcache
*regcache
,
247 int regnum
, const gdb_byte
*buffer
)
249 if (MSP430_NUM_REGS
<= regnum
&& regnum
< MSP430_NUM_TOTAL_REGS
)
253 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
254 int regsize
= register_size (gdbarch
, regnum
);
255 int raw_regnum
= regnum
- MSP430_NUM_REGS
;
257 val
= extract_unsigned_integer (buffer
, regsize
, byte_order
);
258 regcache_raw_write_unsigned (regcache
, raw_regnum
, val
);
262 gdb_assert_not_reached ("invalid pseudo register number");
265 /* Implement the `register_sim_regno' gdbarch method. */
268 msp430_register_sim_regno (struct gdbarch
*gdbarch
, int regnum
)
270 gdb_assert (regnum
< MSP430_NUM_REGS
);
272 /* So long as regnum is in [0, RL78_NUM_REGS), it's valid. We
273 just want to override the default here which disallows register
274 numbers which have no names. */
278 constexpr gdb_byte msp430_break_insn
[] = { 0x43, 0x43 };
280 typedef BP_MANIPULATION (msp430_break_insn
) msp430_breakpoint
;
282 /* Define a "handle" struct for fetching the next opcode. */
284 struct msp430_get_opcode_byte_handle
289 /* Fetch a byte on behalf of the opcode decoder. HANDLE contains
290 the memory address of the next byte to fetch. If successful,
291 the address in the handle is updated and the byte fetched is
292 returned as the value of the function. If not successful, -1
296 msp430_get_opcode_byte (void *handle
)
298 struct msp430_get_opcode_byte_handle
*opcdata
299 = (struct msp430_get_opcode_byte_handle
*) handle
;
303 status
= target_read_memory (opcdata
->pc
, &byte
, 1);
313 /* Function for finding saved registers in a 'struct pv_area'; this
314 function is passed to pv_area_scan.
316 If VALUE is a saved register, ADDR says it was saved at a constant
317 offset from the frame base, and SIZE indicates that the whole
318 register was saved, record its offset. */
321 check_for_saved (void *result_untyped
, pv_t addr
, CORE_ADDR size
, pv_t value
)
323 struct msp430_prologue
*result
= (struct msp430_prologue
*) result_untyped
;
325 if (value
.kind
== pvk_register
327 && pv_is_register (addr
, MSP430_SP_REGNUM
)
328 && size
== register_size (target_gdbarch (), value
.reg
))
329 result
->reg_offset
[value
.reg
] = addr
.k
;
332 /* Analyze a prologue starting at START_PC, going no further than
333 LIMIT_PC. Fill in RESULT as appropriate. */
336 msp430_analyze_prologue (struct gdbarch
*gdbarch
, CORE_ADDR start_pc
,
337 CORE_ADDR limit_pc
, struct msp430_prologue
*result
)
339 CORE_ADDR pc
, next_pc
;
341 pv_t reg
[MSP430_NUM_TOTAL_REGS
];
342 struct pv_area
*stack
;
343 struct cleanup
*back_to
;
344 CORE_ADDR after_last_frame_setup_insn
= start_pc
;
345 int code_model
= gdbarch_tdep (gdbarch
)->code_model
;
348 memset (result
, 0, sizeof (*result
));
350 for (rn
= 0; rn
< MSP430_NUM_TOTAL_REGS
; rn
++)
352 reg
[rn
] = pv_register (rn
, 0);
353 result
->reg_offset
[rn
] = 1;
356 stack
= make_pv_area (MSP430_SP_REGNUM
, gdbarch_addr_bit (gdbarch
));
357 back_to
= make_cleanup_free_pv_area (stack
);
359 /* The call instruction has saved the return address on the stack. */
360 sz
= code_model
== MSP_LARGE_CODE_MODEL
? 4 : 2;
361 reg
[MSP430_SP_REGNUM
] = pv_add_constant (reg
[MSP430_SP_REGNUM
], -sz
);
362 pv_area_store (stack
, reg
[MSP430_SP_REGNUM
], sz
, reg
[MSP430_PC_REGNUM
]);
365 while (pc
< limit_pc
)
368 struct msp430_get_opcode_byte_handle opcode_handle
;
369 MSP430_Opcode_Decoded opc
;
371 opcode_handle
.pc
= pc
;
372 bytes_read
= msp430_decode_opcode (pc
, &opc
, msp430_get_opcode_byte
,
374 next_pc
= pc
+ bytes_read
;
376 if (opc
.id
== MSO_push
&& opc
.op
[0].type
== MSP430_Operand_Register
)
378 int rsrc
= opc
.op
[0].reg
;
380 reg
[MSP430_SP_REGNUM
] = pv_add_constant (reg
[MSP430_SP_REGNUM
], -2);
381 pv_area_store (stack
, reg
[MSP430_SP_REGNUM
], 2, reg
[rsrc
]);
382 after_last_frame_setup_insn
= next_pc
;
384 else if (opc
.id
== MSO_push
/* PUSHM */
385 && opc
.op
[0].type
== MSP430_Operand_None
386 && opc
.op
[1].type
== MSP430_Operand_Register
)
388 int rsrc
= opc
.op
[1].reg
;
389 int count
= opc
.repeats
+ 1;
390 int size
= opc
.size
== 16 ? 2 : 4;
394 reg
[MSP430_SP_REGNUM
]
395 = pv_add_constant (reg
[MSP430_SP_REGNUM
], -size
);
396 pv_area_store (stack
, reg
[MSP430_SP_REGNUM
], size
, reg
[rsrc
]);
400 after_last_frame_setup_insn
= next_pc
;
402 else if (opc
.id
== MSO_sub
403 && opc
.op
[0].type
== MSP430_Operand_Register
404 && opc
.op
[0].reg
== MSR_SP
405 && opc
.op
[1].type
== MSP430_Operand_Immediate
)
407 int addend
= opc
.op
[1].addend
;
409 reg
[MSP430_SP_REGNUM
] = pv_add_constant (reg
[MSP430_SP_REGNUM
],
411 after_last_frame_setup_insn
= next_pc
;
413 else if (opc
.id
== MSO_mov
414 && opc
.op
[0].type
== MSP430_Operand_Immediate
415 && 12 <= opc
.op
[0].reg
&& opc
.op
[0].reg
<= 15)
416 after_last_frame_setup_insn
= next_pc
;
419 /* Terminate the prologue scan. */
426 /* Is the frame size (offset, really) a known constant? */
427 if (pv_is_register (reg
[MSP430_SP_REGNUM
], MSP430_SP_REGNUM
))
428 result
->frame_size
= reg
[MSP430_SP_REGNUM
].k
;
430 /* Record where all the registers were saved. */
431 pv_area_scan (stack
, check_for_saved
, result
);
433 result
->prologue_end
= after_last_frame_setup_insn
;
435 do_cleanups (back_to
);
438 /* Implement the "skip_prologue" gdbarch method. */
441 msp430_skip_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
444 CORE_ADDR func_addr
, func_end
;
445 struct msp430_prologue p
;
447 /* Try to find the extent of the function that contains PC. */
448 if (!find_pc_partial_function (pc
, &name
, &func_addr
, &func_end
))
451 msp430_analyze_prologue (gdbarch
, pc
, func_end
, &p
);
452 return p
.prologue_end
;
455 /* Implement the "unwind_pc" gdbarch method. */
458 msp430_unwind_pc (struct gdbarch
*arch
, struct frame_info
*next_frame
)
460 return frame_unwind_register_unsigned (next_frame
, MSP430_PC_REGNUM
);
463 /* Implement the "unwind_sp" gdbarch method. */
466 msp430_unwind_sp (struct gdbarch
*arch
, struct frame_info
*next_frame
)
468 return frame_unwind_register_unsigned (next_frame
, MSP430_SP_REGNUM
);
471 /* Given a frame described by THIS_FRAME, decode the prologue of its
472 associated function if there is not cache entry as specified by
473 THIS_PROLOGUE_CACHE. Save the decoded prologue in the cache and
474 return that struct as the value of this function. */
476 static struct msp430_prologue
*
477 msp430_analyze_frame_prologue (struct frame_info
*this_frame
,
478 void **this_prologue_cache
)
480 if (!*this_prologue_cache
)
482 CORE_ADDR func_start
, stop_addr
;
484 *this_prologue_cache
= FRAME_OBSTACK_ZALLOC (struct msp430_prologue
);
486 func_start
= get_frame_func (this_frame
);
487 stop_addr
= get_frame_pc (this_frame
);
489 /* If we couldn't find any function containing the PC, then
490 just initialize the prologue cache, but don't do anything. */
492 stop_addr
= func_start
;
494 msp430_analyze_prologue (get_frame_arch (this_frame
), func_start
,
496 (struct msp430_prologue
*) *this_prologue_cache
);
499 return (struct msp430_prologue
*) *this_prologue_cache
;
502 /* Given a frame and a prologue cache, return this frame's base. */
505 msp430_frame_base (struct frame_info
*this_frame
, void **this_prologue_cache
)
507 struct msp430_prologue
*p
508 = msp430_analyze_frame_prologue (this_frame
, this_prologue_cache
);
509 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, MSP430_SP_REGNUM
);
511 return sp
- p
->frame_size
;
514 /* Implement the "frame_this_id" method for unwinding frames. */
517 msp430_this_id (struct frame_info
*this_frame
,
518 void **this_prologue_cache
, struct frame_id
*this_id
)
520 *this_id
= frame_id_build (msp430_frame_base (this_frame
,
521 this_prologue_cache
),
522 get_frame_func (this_frame
));
525 /* Implement the "frame_prev_register" method for unwinding frames. */
527 static struct value
*
528 msp430_prev_register (struct frame_info
*this_frame
,
529 void **this_prologue_cache
, int regnum
)
531 struct msp430_prologue
*p
532 = msp430_analyze_frame_prologue (this_frame
, this_prologue_cache
);
533 CORE_ADDR frame_base
= msp430_frame_base (this_frame
, this_prologue_cache
);
535 if (regnum
== MSP430_SP_REGNUM
)
536 return frame_unwind_got_constant (this_frame
, regnum
, frame_base
);
538 /* If prologue analysis says we saved this register somewhere,
539 return a description of the stack slot holding it. */
540 else if (p
->reg_offset
[regnum
] != 1)
542 struct value
*rv
= frame_unwind_got_memory (this_frame
, regnum
,
544 p
->reg_offset
[regnum
]);
546 if (regnum
== MSP430_PC_REGNUM
)
548 ULONGEST pc
= value_as_long (rv
);
550 return frame_unwind_got_constant (this_frame
, regnum
, pc
);
555 /* Otherwise, presume we haven't changed the value of this
556 register, and get it from the next frame. */
558 return frame_unwind_got_register (this_frame
, regnum
, regnum
);
561 static const struct frame_unwind msp430_unwind
= {
563 default_frame_unwind_stop_reason
,
565 msp430_prev_register
,
567 default_frame_sniffer
570 /* Implement the "dwarf2_reg_to_regnum" gdbarch method. */
573 msp430_dwarf2_reg_to_regnum (struct gdbarch
*gdbarch
, int reg
)
575 if (reg
>= 0 && reg
< MSP430_NUM_REGS
)
576 return reg
+ MSP430_NUM_REGS
;
580 /* Implement the "return_value" gdbarch method. */
582 static enum return_value_convention
583 msp430_return_value (struct gdbarch
*gdbarch
,
584 struct value
*function
,
585 struct type
*valtype
,
586 struct regcache
*regcache
,
587 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
589 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
590 LONGEST valtype_len
= TYPE_LENGTH (valtype
);
591 int code_model
= gdbarch_tdep (gdbarch
)->code_model
;
593 if (TYPE_LENGTH (valtype
) > 8
594 || TYPE_CODE (valtype
) == TYPE_CODE_STRUCT
595 || TYPE_CODE (valtype
) == TYPE_CODE_UNION
)
596 return RETURN_VALUE_STRUCT_CONVENTION
;
601 int argreg
= MSP430_R12_REGNUM
;
604 while (valtype_len
> 0)
608 if (code_model
== MSP_LARGE_CODE_MODEL
609 && TYPE_CODE (valtype
) == TYPE_CODE_PTR
)
614 regcache_cooked_read_unsigned (regcache
, argreg
, &u
);
615 store_unsigned_integer (readbuf
+ offset
, size
, byte_order
, u
);
625 int argreg
= MSP430_R12_REGNUM
;
628 while (valtype_len
> 0)
632 if (code_model
== MSP_LARGE_CODE_MODEL
633 && TYPE_CODE (valtype
) == TYPE_CODE_PTR
)
638 u
= extract_unsigned_integer (writebuf
+ offset
, size
, byte_order
);
639 regcache_cooked_write_unsigned (regcache
, argreg
, u
);
646 return RETURN_VALUE_REGISTER_CONVENTION
;
650 /* Implement the "frame_align" gdbarch method. */
653 msp430_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR sp
)
655 return align_down (sp
, 2);
659 /* Implement the "dummy_id" gdbarch method. */
661 static struct frame_id
662 msp430_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*this_frame
)
665 frame_id_build (get_frame_register_unsigned
666 (this_frame
, MSP430_SP_REGNUM
),
667 get_frame_pc (this_frame
));
671 /* Implement the "push_dummy_call" gdbarch method. */
674 msp430_push_dummy_call (struct gdbarch
*gdbarch
, struct value
*function
,
675 struct regcache
*regcache
, CORE_ADDR bp_addr
,
676 int nargs
, struct value
**args
, CORE_ADDR sp
,
677 int struct_return
, CORE_ADDR struct_addr
)
679 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
683 int code_model
= gdbarch_tdep (gdbarch
)->code_model
;
685 struct type
*func_type
= value_type (function
);
687 /* Dereference function pointer types. */
688 while (TYPE_CODE (func_type
) == TYPE_CODE_PTR
)
689 func_type
= TYPE_TARGET_TYPE (func_type
);
691 /* The end result had better be a function or a method. */
692 gdb_assert (TYPE_CODE (func_type
) == TYPE_CODE_FUNC
693 || TYPE_CODE (func_type
) == TYPE_CODE_METHOD
);
695 /* We make two passes; the first does the stack allocation,
696 the second actually stores the arguments. */
697 for (write_pass
= 0; write_pass
<= 1; write_pass
++)
700 int arg_reg
= MSP430_R12_REGNUM
;
701 int args_on_stack
= 0;
704 sp
= align_down (sp
- sp_off
, 4);
710 regcache_cooked_write_unsigned (regcache
, arg_reg
, struct_addr
);
714 /* Push the arguments. */
715 for (i
= 0; i
< nargs
; i
++)
717 struct value
*arg
= args
[i
];
718 const gdb_byte
*arg_bits
= value_contents_all (arg
);
719 struct type
*arg_type
= check_typedef (value_type (arg
));
720 ULONGEST arg_size
= TYPE_LENGTH (arg_type
);
722 int current_arg_on_stack
;
724 current_arg_on_stack
= 0;
726 if (TYPE_CODE (arg_type
) == TYPE_CODE_STRUCT
727 || TYPE_CODE (arg_type
) == TYPE_CODE_UNION
)
729 /* Aggregates of any size are passed by reference. */
730 gdb_byte struct_addr
[4];
732 store_unsigned_integer (struct_addr
, 4, byte_order
,
733 value_address (arg
));
734 arg_bits
= struct_addr
;
735 arg_size
= (code_model
== MSP_LARGE_CODE_MODEL
) ? 4 : 2;
739 /* Scalars bigger than 8 bytes such as complex doubles are passed
742 current_arg_on_stack
= 1;
746 for (offset
= 0; offset
< arg_size
; offset
+= 2)
748 /* The condition below prevents 8 byte scalars from being split
749 between registers and memory (stack). It also prevents other
750 splits once the stack has been written to. */
751 if (!current_arg_on_stack
753 + ((arg_size
== 8 || args_on_stack
)
754 ? ((arg_size
- offset
) / 2 - 1)
755 : 0) <= MSP430_R15_REGNUM
))
759 if (code_model
== MSP_LARGE_CODE_MODEL
760 && (TYPE_CODE (arg_type
) == TYPE_CODE_PTR
761 || TYPE_IS_REFERENCE (arg_type
)
762 || TYPE_CODE (arg_type
) == TYPE_CODE_STRUCT
763 || TYPE_CODE (arg_type
) == TYPE_CODE_UNION
))
765 /* When using the large memory model, pointer,
766 reference, struct, and union arguments are
767 passed using the entire register. (As noted
768 earlier, aggregates are always passed by
776 regcache_cooked_write_unsigned (regcache
, arg_reg
,
777 extract_unsigned_integer
778 (arg_bits
+ offset
, size
,
786 write_memory (sp
+ sp_off
, arg_bits
+ offset
, 2);
790 current_arg_on_stack
= 1;
796 /* Keep track of the stack address prior to pushing the return address.
797 This is the value that we'll return. */
800 /* Push the return address. */
802 int sz
= (gdbarch_tdep (gdbarch
)->code_model
== MSP_SMALL_CODE_MODEL
)
805 write_memory_unsigned_integer (sp
, sz
, byte_order
, bp_addr
);
808 /* Update the stack pointer. */
809 regcache_cooked_write_unsigned (regcache
, MSP430_SP_REGNUM
, sp
);
814 /* In order to keep code size small, the compiler may create epilogue
815 code through which more than one function epilogue is routed. I.e.
816 the epilogue and return may just be a branch to some common piece of
817 code which is responsible for tearing down the frame and performing
818 the return. These epilog (label) names will have the common prefix
821 static const char msp430_epilog_name_prefix
[] = "__mspabi_func_epilog_";
823 /* Implement the "in_return_stub" gdbarch method. */
826 msp430_in_return_stub (struct gdbarch
*gdbarch
, CORE_ADDR pc
,
830 && startswith (name
, msp430_epilog_name_prefix
));
833 /* Implement the "skip_trampoline_code" gdbarch method. */
835 msp430_skip_trampoline_code (struct frame_info
*frame
, CORE_ADDR pc
)
837 struct bound_minimal_symbol bms
;
838 const char *stub_name
;
839 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
841 bms
= lookup_minimal_symbol_by_pc (pc
);
845 stub_name
= MSYMBOL_LINKAGE_NAME (bms
.minsym
);
847 if (gdbarch_tdep (gdbarch
)->code_model
== MSP_SMALL_CODE_MODEL
848 && msp430_in_return_stub (gdbarch
, pc
, stub_name
))
850 CORE_ADDR sp
= get_frame_register_unsigned (frame
, MSP430_SP_REGNUM
);
852 return read_memory_integer
853 (sp
+ 2 * (stub_name
[strlen (msp430_epilog_name_prefix
)] - '0'),
854 2, gdbarch_byte_order (gdbarch
));
860 /* Allocate and initialize a gdbarch object. */
862 static struct gdbarch
*
863 msp430_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
865 struct gdbarch
*gdbarch
;
866 struct gdbarch_tdep
*tdep
;
867 int elf_flags
, isa
, code_model
;
869 /* Extract the elf_flags if available. */
870 if (info
.abfd
!= NULL
871 && bfd_get_flavour (info
.abfd
) == bfd_target_elf_flavour
)
872 elf_flags
= elf_elfheader (info
.abfd
)->e_flags
;
876 if (info
.abfd
!= NULL
)
877 switch (bfd_elf_get_obj_attr_int (info
.abfd
, OBJ_ATTR_PROC
,
878 OFBA_MSPABI_Tag_ISA
))
881 isa
= MSP_ISA_MSP430
;
882 code_model
= MSP_SMALL_CODE_MODEL
;
885 isa
= MSP_ISA_MSP430X
;
886 switch (bfd_elf_get_obj_attr_int (info
.abfd
, OBJ_ATTR_PROC
,
887 OFBA_MSPABI_Tag_Code_Model
))
890 code_model
= MSP_SMALL_CODE_MODEL
;
893 code_model
= MSP_LARGE_CODE_MODEL
;
896 internal_error (__FILE__
, __LINE__
,
897 _("Unknown msp430x code memory model"));
902 /* This can happen when loading a previously dumped data structure.
903 Use the ISA and code model from the current architecture, provided
906 struct gdbarch
*ca
= get_current_arch ();
907 if (ca
&& gdbarch_bfd_arch_info (ca
)->arch
== bfd_arch_msp430
)
909 struct gdbarch_tdep
*ca_tdep
= gdbarch_tdep (ca
);
911 elf_flags
= ca_tdep
->elf_flags
;
913 code_model
= ca_tdep
->code_model
;
916 /* Otherwise, fall through... */
919 error (_("Unknown msp430 isa"));
924 isa
= MSP_ISA_MSP430
;
925 code_model
= MSP_SMALL_CODE_MODEL
;
929 /* Try to find the architecture in the list of already defined
931 for (arches
= gdbarch_list_lookup_by_info (arches
, &info
);
933 arches
= gdbarch_list_lookup_by_info (arches
->next
, &info
))
935 struct gdbarch_tdep
*candidate_tdep
= gdbarch_tdep (arches
->gdbarch
);
937 if (candidate_tdep
->elf_flags
!= elf_flags
938 || candidate_tdep
->isa
!= isa
939 || candidate_tdep
->code_model
!= code_model
)
942 return arches
->gdbarch
;
945 /* None found, create a new architecture from the information
947 tdep
= XCNEW (struct gdbarch_tdep
);
948 gdbarch
= gdbarch_alloc (&info
, tdep
);
949 tdep
->elf_flags
= elf_flags
;
951 tdep
->code_model
= code_model
;
954 set_gdbarch_num_regs (gdbarch
, MSP430_NUM_REGS
);
955 set_gdbarch_num_pseudo_regs (gdbarch
, MSP430_NUM_PSEUDO_REGS
);
956 set_gdbarch_register_name (gdbarch
, msp430_register_name
);
957 if (isa
== MSP_ISA_MSP430
)
958 set_gdbarch_register_type (gdbarch
, msp430_register_type
);
960 set_gdbarch_register_type (gdbarch
, msp430x_register_type
);
961 set_gdbarch_pc_regnum (gdbarch
, MSP430_PC_REGNUM
);
962 set_gdbarch_sp_regnum (gdbarch
, MSP430_SP_REGNUM
);
963 set_gdbarch_register_reggroup_p (gdbarch
, msp430_register_reggroup_p
);
964 set_gdbarch_pseudo_register_read (gdbarch
, msp430_pseudo_register_read
);
965 set_gdbarch_pseudo_register_write (gdbarch
, msp430_pseudo_register_write
);
966 set_gdbarch_dwarf2_reg_to_regnum (gdbarch
, msp430_dwarf2_reg_to_regnum
);
967 set_gdbarch_register_sim_regno (gdbarch
, msp430_register_sim_regno
);
970 set_gdbarch_char_signed (gdbarch
, 0);
971 set_gdbarch_short_bit (gdbarch
, 16);
972 set_gdbarch_int_bit (gdbarch
, 16);
973 set_gdbarch_long_bit (gdbarch
, 32);
974 set_gdbarch_long_long_bit (gdbarch
, 64);
975 if (code_model
== MSP_SMALL_CODE_MODEL
)
977 set_gdbarch_ptr_bit (gdbarch
, 16);
978 set_gdbarch_addr_bit (gdbarch
, 16);
980 else /* MSP_LARGE_CODE_MODEL */
982 set_gdbarch_ptr_bit (gdbarch
, 32);
983 set_gdbarch_addr_bit (gdbarch
, 32);
985 set_gdbarch_dwarf2_addr_size (gdbarch
, 4);
986 set_gdbarch_float_bit (gdbarch
, 32);
987 set_gdbarch_float_format (gdbarch
, floatformats_ieee_single
);
988 set_gdbarch_double_bit (gdbarch
, 64);
989 set_gdbarch_long_double_bit (gdbarch
, 64);
990 set_gdbarch_double_format (gdbarch
, floatformats_ieee_double
);
991 set_gdbarch_long_double_format (gdbarch
, floatformats_ieee_double
);
994 set_gdbarch_breakpoint_kind_from_pc (gdbarch
,
995 msp430_breakpoint::kind_from_pc
);
996 set_gdbarch_sw_breakpoint_from_kind (gdbarch
,
997 msp430_breakpoint::bp_from_kind
);
998 set_gdbarch_decr_pc_after_break (gdbarch
, 1);
1000 /* Frames, prologues, etc. */
1001 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1002 set_gdbarch_skip_prologue (gdbarch
, msp430_skip_prologue
);
1003 set_gdbarch_unwind_pc (gdbarch
, msp430_unwind_pc
);
1004 set_gdbarch_unwind_sp (gdbarch
, msp430_unwind_sp
);
1005 set_gdbarch_frame_align (gdbarch
, msp430_frame_align
);
1006 dwarf2_append_unwinders (gdbarch
);
1007 frame_unwind_append_unwinder (gdbarch
, &msp430_unwind
);
1009 /* Dummy frames, return values. */
1010 set_gdbarch_dummy_id (gdbarch
, msp430_dummy_id
);
1011 set_gdbarch_push_dummy_call (gdbarch
, msp430_push_dummy_call
);
1012 set_gdbarch_return_value (gdbarch
, msp430_return_value
);
1015 set_gdbarch_in_solib_return_trampoline (gdbarch
, msp430_in_return_stub
);
1016 set_gdbarch_skip_trampoline_code (gdbarch
, msp430_skip_trampoline_code
);
1018 /* Virtual tables. */
1019 set_gdbarch_vbit_in_delta (gdbarch
, 0);
1024 /* Register the initialization routine. */
1027 _initialize_msp430_tdep (void)
1029 register_gdbarch_init (bfd_arch_msp430
, msp430_gdbarch_init
);