1 /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
3 Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 #include "arch-utils.h"
28 #include "gdb_string.h"
29 #include "gdb_assert.h"
30 #include "gdbcore.h" /* for write_memory_unsigned_integer */
34 #include "frame-unwind.h"
35 #include "frame-base.h"
36 #include "trad-frame.h"
38 #include "dwarf2-frame.h"
41 #include "mn10300-tdep.h"
44 extern struct trad_frame_cache *mn10300_frame_unwind_cache (struct frame_info*,
47 /* Compute the alignment required by a type. */
50 mn10300_type_align (struct type *type)
54 switch (TYPE_CODE (type))
65 return TYPE_LENGTH (type);
67 case TYPE_CODE_COMPLEX:
68 return TYPE_LENGTH (type) / 2;
70 case TYPE_CODE_STRUCT:
72 for (i = 0; i < TYPE_NFIELDS (type); i++)
74 int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i));
75 while (align < falign)
81 /* HACK! Structures containing arrays, even small ones, are not
82 elligible for returning in registers. */
85 case TYPE_CODE_TYPEDEF:
86 return mn10300_type_align (check_typedef (type));
89 internal_error (__FILE__, __LINE__, _("bad switch"));
93 /* Should call_function allocate stack space for a struct return? */
95 mn10300_use_struct_convention (struct type *type)
97 /* Structures bigger than a pair of words can't be returned in
99 if (TYPE_LENGTH (type) > 8)
102 switch (TYPE_CODE (type))
104 case TYPE_CODE_STRUCT:
105 case TYPE_CODE_UNION:
106 /* Structures with a single field are handled as the field
108 if (TYPE_NFIELDS (type) == 1)
109 return mn10300_use_struct_convention (TYPE_FIELD_TYPE (type, 0));
111 /* Structures with word or double-word size are passed in memory, as
112 long as they require at least word alignment. */
113 if (mn10300_type_align (type) >= 4)
118 /* Arrays are addressable, so they're never returned in
119 registers. This condition can only hold when the array is
120 the only field of a struct or union. */
121 case TYPE_CODE_ARRAY:
124 case TYPE_CODE_TYPEDEF:
125 return mn10300_use_struct_convention (check_typedef (type));
133 mn10300_store_return_value (struct gdbarch *gdbarch, struct type *type,
134 struct regcache *regcache, const void *valbuf)
136 int len = TYPE_LENGTH (type);
139 if (TYPE_CODE (type) == TYPE_CODE_PTR)
144 regsz = register_size (gdbarch, reg);
147 regcache_raw_write_part (regcache, reg, 0, len, valbuf);
148 else if (len <= 2 * regsz)
150 regcache_raw_write (regcache, reg, valbuf);
151 gdb_assert (regsz == register_size (gdbarch, reg + 1));
152 regcache_raw_write_part (regcache, reg+1, 0,
153 len - regsz, (char *) valbuf + regsz);
156 internal_error (__FILE__, __LINE__,
157 _("Cannot store return value %d bytes long."), len);
161 mn10300_extract_return_value (struct gdbarch *gdbarch, struct type *type,
162 struct regcache *regcache, void *valbuf)
164 char buf[MAX_REGISTER_SIZE];
165 int len = TYPE_LENGTH (type);
168 if (TYPE_CODE (type) == TYPE_CODE_PTR)
173 regsz = register_size (gdbarch, reg);
176 regcache_raw_read (regcache, reg, buf);
177 memcpy (valbuf, buf, len);
179 else if (len <= 2 * regsz)
181 regcache_raw_read (regcache, reg, buf);
182 memcpy (valbuf, buf, regsz);
183 gdb_assert (regsz == register_size (gdbarch, reg + 1));
184 regcache_raw_read (regcache, reg + 1, buf);
185 memcpy ((char *) valbuf + regsz, buf, len - regsz);
188 internal_error (__FILE__, __LINE__,
189 _("Cannot extract return value %d bytes long."), len);
192 /* Determine, for architecture GDBARCH, how a return value of TYPE
193 should be returned. If it is supposed to be returned in registers,
194 and READBUF is non-zero, read the appropriate value from REGCACHE,
195 and copy it into READBUF. If WRITEBUF is non-zero, write the value
196 from WRITEBUF into REGCACHE. */
198 static enum return_value_convention
199 mn10300_return_value (struct gdbarch *gdbarch, struct type *type,
200 struct regcache *regcache, gdb_byte *readbuf,
201 const gdb_byte *writebuf)
203 if (mn10300_use_struct_convention (type))
204 return RETURN_VALUE_STRUCT_CONVENTION;
207 mn10300_extract_return_value (gdbarch, type, regcache, readbuf);
209 mn10300_store_return_value (gdbarch, type, regcache, writebuf);
211 return RETURN_VALUE_REGISTER_CONVENTION;
215 register_name (int reg, char **regs, long sizeof_regs)
217 if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0]))
224 mn10300_generic_register_name (int reg)
226 static char *regs[] =
227 { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
228 "sp", "pc", "mdr", "psw", "lir", "lar", "", "",
229 "", "", "", "", "", "", "", "",
230 "", "", "", "", "", "", "", "fp"
232 return register_name (reg, regs, sizeof regs);
237 am33_register_name (int reg)
239 static char *regs[] =
240 { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
241 "sp", "pc", "mdr", "psw", "lir", "lar", "",
242 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
243 "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""
245 return register_name (reg, regs, sizeof regs);
250 mn10300_register_type (struct gdbarch *gdbarch, int reg)
252 return builtin_type_int;
256 mn10300_read_pc (ptid_t ptid)
258 return read_register_pid (E_PC_REGNUM, ptid);
262 mn10300_write_pc (CORE_ADDR val, ptid_t ptid)
264 return write_register_pid (E_PC_REGNUM, val, ptid);
267 /* The breakpoint instruction must be the same size as the smallest
268 instruction in the instruction set.
270 The Matsushita mn10x00 processors have single byte instructions
271 so we need a single byte breakpoint. Matsushita hasn't defined
272 one, so we defined it ourselves. */
274 const static unsigned char *
275 mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size)
277 static char breakpoint[] = {0xff};
285 * status -- actually frame type (SP, FP, or last frame)
286 * stack size -- offset to the next frame
288 * The former might ultimately be stored in the frame_base.
289 * Seems like there'd be a way to store the later too.
291 * Temporarily supply empty stub functions as place holders.
295 my_frame_is_in_sp (struct frame_info *fi, void **this_cache)
297 struct trad_frame_cache *cache = mn10300_frame_unwind_cache (fi, this_cache);
298 trad_frame_set_this_base (cache,
299 frame_unwind_register_unsigned (fi,
304 my_frame_is_in_fp (struct frame_info *fi, void **this_cache)
306 struct trad_frame_cache *cache = mn10300_frame_unwind_cache (fi, this_cache);
307 trad_frame_set_this_base (cache,
308 frame_unwind_register_unsigned (fi,
313 my_frame_is_last (struct frame_info *fi)
318 set_my_stack_size (struct frame_info *fi, CORE_ADDR size)
323 /* Set offsets of registers saved by movm instruction.
324 This is a helper function for mn10300_analyze_prologue. */
327 set_movm_offsets (struct frame_info *fi,
331 struct trad_frame_cache *cache;
335 if (fi == NULL || this_cache == NULL)
338 cache = mn10300_frame_unwind_cache (fi, this_cache);
342 base = trad_frame_get_this_base (cache);
343 if (movm_args & movm_other_bit)
345 /* The `other' bit leaves a blank area of four bytes at the
346 beginning of its block of saved registers, making it 32 bytes
348 trad_frame_set_reg_addr (cache, E_LAR_REGNUM, base + offset + 4);
349 trad_frame_set_reg_addr (cache, E_LIR_REGNUM, base + offset + 8);
350 trad_frame_set_reg_addr (cache, E_MDR_REGNUM, base + offset + 12);
351 trad_frame_set_reg_addr (cache, E_A0_REGNUM + 1, base + offset + 16);
352 trad_frame_set_reg_addr (cache, E_A0_REGNUM, base + offset + 20);
353 trad_frame_set_reg_addr (cache, E_D0_REGNUM + 1, base + offset + 24);
354 trad_frame_set_reg_addr (cache, E_D0_REGNUM, base + offset + 28);
358 if (movm_args & movm_a3_bit)
360 trad_frame_set_reg_addr (cache, E_A3_REGNUM, base + offset);
363 if (movm_args & movm_a2_bit)
365 trad_frame_set_reg_addr (cache, E_A2_REGNUM, base + offset);
368 if (movm_args & movm_d3_bit)
370 trad_frame_set_reg_addr (cache, E_D3_REGNUM, base + offset);
373 if (movm_args & movm_d2_bit)
375 trad_frame_set_reg_addr (cache, E_D2_REGNUM, base + offset);
380 if (movm_args & movm_exother_bit)
382 trad_frame_set_reg_addr (cache, E_MCVF_REGNUM, base + offset);
383 trad_frame_set_reg_addr (cache, E_MCRL_REGNUM, base + offset + 4);
384 trad_frame_set_reg_addr (cache, E_MCRH_REGNUM, base + offset + 8);
385 trad_frame_set_reg_addr (cache, E_MDRQ_REGNUM, base + offset + 12);
386 trad_frame_set_reg_addr (cache, E_E1_REGNUM, base + offset + 16);
387 trad_frame_set_reg_addr (cache, E_E0_REGNUM, base + offset + 20);
390 if (movm_args & movm_exreg1_bit)
392 trad_frame_set_reg_addr (cache, E_E7_REGNUM, base + offset);
393 trad_frame_set_reg_addr (cache, E_E6_REGNUM, base + offset + 4);
394 trad_frame_set_reg_addr (cache, E_E5_REGNUM, base + offset + 8);
395 trad_frame_set_reg_addr (cache, E_E4_REGNUM, base + offset + 12);
398 if (movm_args & movm_exreg0_bit)
400 trad_frame_set_reg_addr (cache, E_E3_REGNUM, base + offset);
401 trad_frame_set_reg_addr (cache, E_E2_REGNUM, base + offset + 4);
405 /* The last (or first) thing on the stack will be the PC. */
406 trad_frame_set_reg_addr (cache, E_PC_REGNUM, base + offset);
407 /* Save the SP in the 'traditional' way.
408 This will be the same location where the PC is saved. */
409 trad_frame_set_reg_value (cache, E_SP_REGNUM, base + offset);
412 /* The main purpose of this file is dealing with prologues to extract
413 information about stack frames and saved registers.
415 In gcc/config/mn13000/mn10300.c, the expand_prologue prologue
416 function is pretty readable, and has a nice explanation of how the
417 prologue is generated. The prologues generated by that code will
418 have the following form (NOTE: the current code doesn't handle all
421 + If this is an old-style varargs function, then its arguments
422 need to be flushed back to the stack:
427 + If we use any of the callee-saved registers, save them now.
429 movm [some callee-saved registers],(sp)
431 + If we have any floating-point registers to save:
433 - Decrement the stack pointer to reserve space for the registers.
434 If the function doesn't need a frame pointer, we may combine
435 this with the adjustment that reserves space for the frame.
439 - Save the floating-point registers. We have two possible
442 . Save them at fixed offset from the SP:
444 fmov fsN,(OFFSETN,sp)
445 fmov fsM,(OFFSETM,sp)
448 Note that, if OFFSETN happens to be zero, you'll get the
449 different opcode: fmov fsN,(sp)
451 . Or, set a0 to the start of the save area, and then use
452 post-increment addressing to save the FP registers.
460 + If the function needs a frame pointer, we set it here.
464 + Now we reserve space for the stack frame proper. This could be
465 merged into the `add -SIZE, sp' instruction for FP saves up
466 above, unless we needed to set the frame pointer in the previous
467 step, or the frame is so large that allocating the whole thing at
468 once would put the FP register save slots out of reach of the
469 addressing mode (128 bytes).
473 One day we might keep the stack pointer constant, that won't
474 change the code for prologues, but it will make the frame
475 pointerless case much more common. */
477 /* Analyze the prologue to determine where registers are saved,
478 the end of the prologue, etc etc. Return the end of the prologue
481 We store into FI (if non-null) several tidbits of information:
483 * stack_size -- size of this stack frame. Note that if we stop in
484 certain parts of the prologue/epilogue we may claim the size of the
485 current frame is zero. This happens when the current frame has
486 not been allocated yet or has already been deallocated.
488 * fsr -- Addresses of registers saved in the stack by this frame.
490 * status -- A (relatively) generic status indicator. It's a bitmask
491 with the following bits:
493 MY_FRAME_IN_SP: The base of the current frame is actually in
494 the stack pointer. This can happen for frame pointerless
495 functions, or cases where we're stopped in the prologue/epilogue
496 itself. For these cases mn10300_analyze_prologue will need up
497 update fi->frame before returning or analyzing the register
500 MY_FRAME_IN_FP: The base of the current frame is in the
501 frame pointer register ($a3).
503 NO_MORE_FRAMES: Set this if the current frame is "start" or
504 if the first instruction looks like mov <imm>,sp. This tells
505 frame chain to not bother trying to unwind past this frame. */
508 mn10300_analyze_prologue (struct frame_info *fi,
512 CORE_ADDR func_addr, func_end, addr, stop;
515 unsigned char buf[4];
516 int status, movm_args = 0;
519 /* Use the PC in the frame if it's provided to look up the
520 start of this function.
522 Note: kevinb/2003-07-16: We used to do the following here:
523 pc = (fi ? get_frame_pc (fi) : pc);
524 But this is (now) badly broken when called from analyze_dummy_frame().
528 pc = (pc ? pc : get_frame_pc (fi));
529 /* At the start of a function our frame is in the stack pointer. */
530 my_frame_is_in_sp (fi, this_cache);
533 /* Find the start of this function. */
534 status = find_pc_partial_function (pc, &name, &func_addr, &func_end);
536 /* Do nothing if we couldn't find the start of this function
538 MVS: comment went on to say "or if we're stopped at the first
539 instruction in the prologue" -- but code doesn't reflect that,
540 and I don't want to do that anyway. */
546 /* If we're in start, then give up. */
547 if (strcmp (name, "start") == 0)
550 my_frame_is_last (fi);
554 /* NOTE: from here on, we don't want to return without jumping to
558 /* Figure out where to stop scanning. */
559 stop = fi ? pc : func_end;
561 /* Don't walk off the end of the function. */
562 stop = stop > func_end ? func_end : stop;
564 /* Start scanning on the first instruction of this function. */
567 /* Suck in two bytes. */
568 if (addr + 2 >= stop || !safe_frame_unwind_memory (fi, addr, buf, 2))
569 goto finish_prologue;
571 /* First see if this insn sets the stack pointer from a register; if
572 so, it's probably the initialization of the stack pointer in _start,
573 so mark this as the bottom-most frame. */
574 if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0)
577 my_frame_is_last (fi);
578 goto finish_prologue;
581 /* Now look for movm [regs],sp, which saves the callee saved registers.
583 At this time we don't know if fi->frame is valid, so we only note
584 that we encountered a movm instruction. Later, we'll set the entries
585 in fsr.regs as needed. */
588 /* Extract the register list for the movm instruction. */
593 /* Quit now if we're beyond the stop point. */
595 goto finish_prologue;
597 /* Get the next two bytes so the prologue scan can continue. */
598 if (!safe_frame_unwind_memory (fi, addr, buf, 2))
599 goto finish_prologue;
602 /* Now see if we set up a frame pointer via "mov sp,a3" */
607 /* The frame pointer is now valid. */
610 my_frame_is_in_fp (fi, this_cache);
613 /* Quit now if we're beyond the stop point. */
615 goto finish_prologue;
617 /* Get two more bytes so scanning can continue. */
618 if (!safe_frame_unwind_memory (fi, addr, buf, 2))
619 goto finish_prologue;
622 /* Next we should allocate the local frame. No more prologue insns
623 are found after allocating the local frame.
625 Search for add imm8,sp (0xf8feXX)
626 or add imm16,sp (0xfafeXXXX)
627 or add imm32,sp (0xfcfeXXXXXXXX).
629 If none of the above was found, then this prologue has no
633 if (buf[0] == 0xf8 && buf[1] == 0xfe)
635 else if (buf[0] == 0xfa && buf[1] == 0xfe)
637 else if (buf[0] == 0xfc && buf[1] == 0xfe)
642 /* Suck in imm_size more bytes, they'll hold the size of the
644 if (!safe_frame_unwind_memory (fi, addr + 2, buf, imm_size))
645 goto finish_prologue;
647 /* Note the size of the stack in the frame info structure. */
648 stack_size = extract_signed_integer (buf, imm_size);
650 set_my_stack_size (fi, stack_size);
652 /* We just consumed 2 + imm_size bytes. */
653 addr += 2 + imm_size;
655 /* No more prologue insns follow, so begin preparation to return. */
656 goto finish_prologue;
658 /* Do the essentials and get out of here. */
660 /* Note if/where callee saved registers were saved. */
662 set_movm_offsets (fi, this_cache, movm_args);
666 /* Function: skip_prologue
667 Return the address of the first inst past the prologue of the function. */
670 mn10300_skip_prologue (CORE_ADDR pc)
672 return mn10300_analyze_prologue (NULL, NULL, pc);
675 /* Simple frame_unwind_cache.
676 This finds the "extra info" for the frame. */
677 struct trad_frame_cache *
678 mn10300_frame_unwind_cache (struct frame_info *next_frame,
679 void **this_prologue_cache)
681 struct trad_frame_cache *cache;
682 CORE_ADDR pc, start, end;
684 if (*this_prologue_cache)
685 return (*this_prologue_cache);
687 cache = trad_frame_cache_zalloc (next_frame);
688 pc = gdbarch_unwind_pc (current_gdbarch, next_frame);
689 mn10300_analyze_prologue (next_frame, (void **) &cache, pc);
690 if (find_pc_partial_function (pc, NULL, &start, &end))
691 trad_frame_set_id (cache,
692 frame_id_build (trad_frame_get_this_base (cache),
695 trad_frame_set_id (cache,
696 frame_id_build (trad_frame_get_this_base (cache),
697 frame_func_unwind (next_frame)));
699 (*this_prologue_cache) = cache;
703 /* Here is a dummy implementation. */
704 static struct frame_id
705 mn10300_unwind_dummy_id (struct gdbarch *gdbarch,
706 struct frame_info *next_frame)
708 return frame_id_build (frame_sp_unwind (next_frame),
709 frame_pc_unwind (next_frame));
712 /* Trad frame implementation. */
714 mn10300_frame_this_id (struct frame_info *next_frame,
715 void **this_prologue_cache,
716 struct frame_id *this_id)
718 struct trad_frame_cache *cache =
719 mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
721 trad_frame_get_id (cache, this_id);
725 mn10300_frame_prev_register (struct frame_info *next_frame,
726 void **this_prologue_cache,
727 int regnum, int *optimizedp,
728 enum lval_type *lvalp, CORE_ADDR *addrp,
729 int *realnump, gdb_byte *bufferp)
731 struct trad_frame_cache *cache =
732 mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
734 trad_frame_get_register (cache, next_frame, regnum, optimizedp,
735 lvalp, addrp, realnump, bufferp);
737 trad_frame_get_prev_register (next_frame, cache->prev_regs, regnum,
738 optimizedp, lvalp, addrp, realnump, bufferp);
742 static const struct frame_unwind mn10300_frame_unwind = {
744 mn10300_frame_this_id,
745 mn10300_frame_prev_register
749 mn10300_frame_base_address (struct frame_info *next_frame,
750 void **this_prologue_cache)
752 struct trad_frame_cache *cache =
753 mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
755 return trad_frame_get_this_base (cache);
758 static const struct frame_unwind *
759 mn10300_frame_sniffer (struct frame_info *next_frame)
761 return &mn10300_frame_unwind;
764 static const struct frame_base mn10300_frame_base = {
765 &mn10300_frame_unwind,
766 mn10300_frame_base_address,
767 mn10300_frame_base_address,
768 mn10300_frame_base_address
772 mn10300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
776 frame_unwind_unsigned_register (next_frame, E_PC_REGNUM, &pc);
781 mn10300_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
785 frame_unwind_unsigned_register (next_frame, E_SP_REGNUM, &sp);
790 mn10300_frame_unwind_init (struct gdbarch *gdbarch)
792 frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
793 frame_unwind_append_sniffer (gdbarch, mn10300_frame_sniffer);
794 frame_base_set_default (gdbarch, &mn10300_frame_base);
795 set_gdbarch_unwind_dummy_id (gdbarch, mn10300_unwind_dummy_id);
796 set_gdbarch_unwind_pc (gdbarch, mn10300_unwind_pc);
797 set_gdbarch_unwind_sp (gdbarch, mn10300_unwind_sp);
800 /* Function: push_dummy_call
802 * Set up machine state for a target call, including
803 * function arguments, stack, return address, etc.
808 mn10300_push_dummy_call (struct gdbarch *gdbarch,
809 struct value *target_func,
810 struct regcache *regcache,
812 int nargs, struct value **args,
815 CORE_ADDR struct_addr)
817 const int push_size = register_size (gdbarch, E_PC_REGNUM);
820 int stack_offset = 0;
822 char *val, valbuf[MAX_REGISTER_SIZE];
824 /* This should be a nop, but align the stack just in case something
825 went wrong. Stacks are four byte aligned on the mn10300. */
828 /* Now make space on the stack for the args.
830 XXX This doesn't appear to handle pass-by-invisible reference
832 regs_used = struct_return ? 1 : 0;
833 for (len = 0, argnum = 0; argnum < nargs; argnum++)
835 arg_len = (TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3;
836 while (regs_used < 2 && arg_len > 0)
839 arg_len -= push_size;
844 /* Allocate stack space. */
850 write_register (E_D0_REGNUM, struct_addr);
855 /* Push all arguments onto the stack. */
856 for (argnum = 0; argnum < nargs; argnum++)
858 /* FIXME what about structs? Unions? */
859 if (TYPE_CODE (value_type (*args)) == TYPE_CODE_STRUCT
860 && TYPE_LENGTH (value_type (*args)) > 8)
862 /* Change to pointer-to-type. */
864 store_unsigned_integer (valbuf, push_size,
865 VALUE_ADDRESS (*args));
870 arg_len = TYPE_LENGTH (value_type (*args));
871 val = (char *) value_contents (*args);
874 while (regs_used < 2 && arg_len > 0)
876 write_register (regs_used,
877 extract_unsigned_integer (val, push_size));
879 arg_len -= push_size;
885 write_memory (sp + stack_offset, val, push_size);
886 arg_len -= push_size;
888 stack_offset += push_size;
894 /* Make space for the flushback area. */
897 /* Push the return address that contains the magic breakpoint. */
899 write_memory_unsigned_integer (sp, push_size, bp_addr);
901 regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp);
905 /* If DWARF2 is a register number appearing in Dwarf2 debug info, then
906 mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB
907 register number. Why don't Dwarf2 and GDB use the same numbering?
908 Who knows? But since people have object files lying around with
909 the existing Dwarf2 numbering, and other people have written stubs
910 to work with the existing GDB, neither of them can change. So we
911 just have to cope. */
913 mn10300_dwarf2_reg_to_regnum (int dwarf2)
915 /* This table is supposed to be shaped like the REGISTER_NAMES
916 initializer in gcc/config/mn10300/mn10300.h. Registers which
917 appear in GCC's numbering, but have no counterpart in GDB's
918 world, are marked with a -1. */
919 static int dwarf2_to_gdb[] = {
920 0, 1, 2, 3, 4, 5, 6, 7, -1, 8,
921 15, 16, 17, 18, 19, 20, 21, 22,
922 32, 33, 34, 35, 36, 37, 38, 39,
923 40, 41, 42, 43, 44, 45, 46, 47,
924 48, 49, 50, 51, 52, 53, 54, 55,
925 56, 57, 58, 59, 60, 61, 62, 63
929 || dwarf2 >= ARRAY_SIZE (dwarf2_to_gdb)
930 || dwarf2_to_gdb[dwarf2] == -1)
932 warning (_("Bogus register number in debug info: %d"), dwarf2);
936 return dwarf2_to_gdb[dwarf2];
939 static struct gdbarch *
940 mn10300_gdbarch_init (struct gdbarch_info info,
941 struct gdbarch_list *arches)
943 struct gdbarch *gdbarch;
944 struct gdbarch_tdep *tdep;
946 arches = gdbarch_list_lookup_by_info (arches, &info);
948 return arches->gdbarch;
950 tdep = xmalloc (sizeof (struct gdbarch_tdep));
951 gdbarch = gdbarch_alloc (&info, tdep);
953 switch (info.bfd_arch_info->mach)
956 case bfd_mach_mn10300:
957 set_gdbarch_register_name (gdbarch, mn10300_generic_register_name);
961 set_gdbarch_register_name (gdbarch, am33_register_name);
965 internal_error (__FILE__, __LINE__,
966 _("mn10300_gdbarch_init: Unknown mn10300 variant"));
971 set_gdbarch_num_regs (gdbarch, E_NUM_REGS);
972 set_gdbarch_register_type (gdbarch, mn10300_register_type);
973 set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
974 set_gdbarch_read_pc (gdbarch, mn10300_read_pc);
975 set_gdbarch_write_pc (gdbarch, mn10300_write_pc);
976 set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
977 set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
978 set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum);
980 /* Stack unwinding. */
981 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
983 set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc);
984 /* decr_pc_after_break? */
986 set_gdbarch_print_insn (gdbarch, print_insn_mn10300);
989 set_gdbarch_return_value (gdbarch, mn10300_return_value);
991 /* Stage 3 -- get target calls working. */
992 set_gdbarch_push_dummy_call (gdbarch, mn10300_push_dummy_call);
993 /* set_gdbarch_return_value (store, extract) */
996 mn10300_frame_unwind_init (gdbarch);
998 /* Hook in ABI-specific overrides, if they have been registered. */
999 gdbarch_init_osabi (info, gdbarch);
1004 /* Dump out the mn10300 specific architecture information. */
1007 mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
1009 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
1010 fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
1015 _initialize_mn10300_tdep (void)
1017 gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep);