1 /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
3 Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
4 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. */
25 To get from 1.1 to 1.2, add:
29 extract_struct_value_address
31 Make sure to use regcache. */
35 Apparently cannot run without a stub placeholder for unwind_dummy_id.
40 To get from 1.2 to 1.3, add:
43 struct mn10300_unwind_cache
48 frame_sniffer (struct mn10300_frame_unwind)
52 #include "arch-utils.h"
56 #include "gdb_string.h"
57 #include "gdb_assert.h"
58 #include "gdbcore.h" /* for write_memory_unsigned_integer */
62 #include "frame-unwind.h"
63 #include "frame-base.h"
64 #include "trad-frame.h"
66 #include "dwarf2-frame.h"
69 #include "mn10300-tdep.h"
72 /* Compute the alignment required by a type. */
75 mn10300_type_align (struct type *type)
79 switch (TYPE_CODE (type))
90 return TYPE_LENGTH (type);
92 case TYPE_CODE_COMPLEX:
93 return TYPE_LENGTH (type) / 2;
95 case TYPE_CODE_STRUCT:
97 for (i = 0; i < TYPE_NFIELDS (type); i++)
99 int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i));
100 while (align < falign)
105 case TYPE_CODE_ARRAY:
106 /* HACK! Structures containing arrays, even small ones, are not
107 elligible for returning in registers. */
110 case TYPE_CODE_TYPEDEF:
111 return mn10300_type_align (check_typedef (type));
114 internal_error (__FILE__, __LINE__, _("bad switch"));
118 /* MVS note this is deprecated. */
119 /* Should call_function allocate stack space for a struct return? */
122 mn10300_use_struct_convention (int gcc_p, struct type *type)
124 /* Structures bigger than a pair of words can't be returned in
126 if (TYPE_LENGTH (type) > 8)
129 switch (TYPE_CODE (type))
131 case TYPE_CODE_STRUCT:
132 case TYPE_CODE_UNION:
133 /* Structures with a single field are handled as the field
135 if (TYPE_NFIELDS (type) == 1)
136 return mn10300_use_struct_convention (gcc_p,
137 TYPE_FIELD_TYPE (type, 0));
139 /* Structures with word or double-word size are passed in memory, as
140 long as they require at least word alignment. */
141 if (mn10300_type_align (type) >= 4)
146 /* Arrays are addressable, so they're never returned in
147 registers. This condition can only hold when the array is
148 the only field of a struct or union. */
149 case TYPE_CODE_ARRAY:
152 case TYPE_CODE_TYPEDEF:
153 return mn10300_use_struct_convention (gcc_p, check_typedef (type));
160 /* MVS note this is deprecated. */
162 mn10300_store_return_value (struct type *type,
163 struct regcache *regcache, const void *valbuf)
165 struct gdbarch *gdbarch = get_regcache_arch (regcache);
166 int len = TYPE_LENGTH (type);
169 if (TYPE_CODE (type) == TYPE_CODE_PTR)
174 regsz = register_size (gdbarch, reg);
177 regcache_raw_write_part (regcache, reg, 0, len, valbuf);
178 else if (len <= 2 * regsz)
180 regcache_raw_write (regcache, reg, valbuf);
181 gdb_assert (regsz == register_size (gdbarch, reg + 1));
182 regcache_raw_write_part (regcache, reg+1, 0,
183 len - regsz, (char *) valbuf + regsz);
186 internal_error (__FILE__, __LINE__,
187 _("Cannot store return value %d bytes long."), len);
190 /* MVS note deprecated. */
192 mn10300_extract_return_value (struct type *type,
193 struct regcache *regcache, void *valbuf)
195 struct gdbarch *gdbarch = get_regcache_arch (regcache);
196 char buf[MAX_REGISTER_SIZE];
197 int len = TYPE_LENGTH (type);
200 if (TYPE_CODE (type) == TYPE_CODE_PTR)
205 regsz = register_size (gdbarch, reg);
208 regcache_raw_read (regcache, reg, buf);
209 memcpy (valbuf, buf, len);
211 else if (len <= 2 * regsz)
213 regcache_raw_read (regcache, reg, buf);
214 memcpy (valbuf, buf, regsz);
215 gdb_assert (regsz == register_size (gdbarch, reg + 1));
216 regcache_raw_read (regcache, reg + 1, buf);
217 memcpy ((char *) valbuf + regsz, buf, len - regsz);
220 internal_error (__FILE__, __LINE__,
221 _("Cannot extract return value %d bytes long."), len);
225 register_name (int reg, char **regs, long sizeof_regs)
227 if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0]))
234 mn10300_generic_register_name (int reg)
236 static char *regs[] =
237 { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
238 "sp", "pc", "mdr", "psw", "lir", "lar", "", "",
239 "", "", "", "", "", "", "", "",
240 "", "", "", "", "", "", "", "fp"
242 return register_name (reg, regs, sizeof regs);
247 am33_register_name (int reg)
249 static char *regs[] =
250 { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
251 "sp", "pc", "mdr", "psw", "lir", "lar", "",
252 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
253 "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""
255 return register_name (reg, regs, sizeof regs);
260 mn10300_register_type (struct gdbarch *gdbarch, int reg)
262 return builtin_type_int;
266 mn10300_read_pc (ptid_t ptid)
268 return read_register_pid (E_PC_REGNUM, ptid);
272 mn10300_write_pc (CORE_ADDR val, ptid_t ptid)
274 return write_register_pid (E_PC_REGNUM, val, ptid);
277 /* The breakpoint instruction must be the same size as the smallest
278 instruction in the instruction set.
280 The Matsushita mn10x00 processors have single byte instructions
281 so we need a single byte breakpoint. Matsushita hasn't defined
282 one, so we defined it ourselves. */
284 const static unsigned char *
285 mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size)
287 static char breakpoint[] = {0xff};
292 /* Function: skip_prologue
293 Return the address of the first inst past the prologue of the function. */
296 mn10300_skip_prologue (CORE_ADDR pc)
300 /* FIXME: not implemented. */
301 /* First approximation, try simply using skip_prologue_using_sal. */
302 ret = skip_prologue_using_sal (pc);
303 return ret ? ret : pc;
305 return mn10300_analyze_prologue (NULL, NULL, pc);
309 /* Simple frame_unwind_cache.
310 This finds the "extra info" for the frame. */
311 struct trad_frame_cache *
312 mn10300_frame_unwind_cache (struct frame_info *next_frame,
313 void **this_prologue_cache)
315 struct trad_frame_cache *cache;
318 if (*this_prologue_cache)
319 return (*this_prologue_cache);
321 cache = trad_frame_cache_zalloc (next_frame);
322 pc = gdbarch_unwind_pc (current_gdbarch, next_frame);
323 mn10300_analyze_prologue (next_frame, (void **) &cache, pc);
325 trad_frame_set_id (cache,
326 frame_id_build (trad_frame_get_this_base (cache),
327 frame_func_unwind (next_frame)));
329 (*this_prologue_cache) = cache;
333 /* Here is a dummy implementation. */
334 static struct frame_id
335 mn10300_unwind_dummy_id (struct gdbarch *gdbarch,
336 struct frame_info *next_frame)
338 return frame_id_build (frame_sp_unwind (next_frame),
339 frame_pc_unwind (next_frame));
342 /* Trad frame implementation. */
344 mn10300_frame_this_id (struct frame_info *next_frame,
345 void **this_prologue_cache,
346 struct frame_id *this_id)
348 struct trad_frame_cache *cache =
349 mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
351 trad_frame_get_id (cache, this_id);
355 mn10300_frame_prev_register (struct frame_info *next_frame,
356 void **this_prologue_cache,
357 int regnum, int *optimizedp,
358 enum lval_type *lvalp, CORE_ADDR *addrp,
359 int *realnump, void *bufferp)
361 struct trad_frame_cache *cache =
362 mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
364 trad_frame_get_register (cache, next_frame, regnum, optimizedp,
365 lvalp, addrp, realnump, bufferp);
367 trad_frame_get_prev_register (next_frame, cache->prev_regs, regnum,
368 optimizedp, lvalp, addrp, realnump, bufferp);
372 static const struct frame_unwind mn10300_frame_unwind = {
374 mn10300_frame_this_id,
375 mn10300_frame_prev_register
379 mn10300_frame_base_address (struct frame_info *next_frame,
380 void **this_prologue_cache)
382 struct trad_frame_cache *cache =
383 mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
385 return trad_frame_get_this_base (cache);
388 static const struct frame_unwind *
389 mn10300_frame_sniffer (struct frame_info *next_frame)
391 return &mn10300_frame_unwind;
394 static const struct frame_base mn10300_frame_base = {
395 &mn10300_frame_unwind,
396 mn10300_frame_base_address,
397 mn10300_frame_base_address,
398 mn10300_frame_base_address
402 mn10300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
406 frame_unwind_unsigned_register (next_frame, E_PC_REGNUM, &pc);
411 mn10300_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
415 frame_unwind_unsigned_register (next_frame, E_SP_REGNUM, &sp);
420 mn10300_frame_unwind_init (struct gdbarch *gdbarch)
422 frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
423 frame_unwind_append_sniffer (gdbarch, mn10300_frame_sniffer);
424 frame_base_set_default (gdbarch, &mn10300_frame_base);
425 set_gdbarch_unwind_dummy_id (gdbarch, mn10300_unwind_dummy_id);
426 set_gdbarch_unwind_pc (gdbarch, mn10300_unwind_pc);
427 set_gdbarch_unwind_sp (gdbarch, mn10300_unwind_sp);
430 /* Function: push_dummy_call
432 * Set up machine state for a target call, including
433 * function arguments, stack, return address, etc.
438 mn10300_push_dummy_call (struct gdbarch *gdbarch,
439 struct value *target_func,
440 struct regcache *regcache,
442 int nargs, struct value **args,
445 CORE_ADDR struct_addr)
447 const int push_size = register_size (gdbarch, E_PC_REGNUM);
448 int regs_used = struct_return ? 1 : 0;
450 int stack_offset = 0;
454 /* FIXME temp, don't handle struct args at all. */
456 error ("Target doesn't handle struct return");
458 /* This should be a nop, but align the stack just in case something
459 went wrong. Stacks are four byte aligned on the mn10300. */
462 /* Now make space on the stack for the args.
464 XXX This doesn't appear to handle pass-by-invisible reference
466 for (len = 0, argnum = 0; argnum < nargs; argnum++)
468 arg_len = (TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3;
469 if (TYPE_CODE (value_type (args[argnum])) == TYPE_CODE_STRUCT)
470 error ("Target does not handle struct args");
471 while (regs_used < 2 && arg_len > 0)
474 arg_len -= push_size;
479 /* Allocate stack space. */
482 regs_used = struct_return ? 1 : 0;
483 /* Push all arguments onto the stack. */
484 for (argnum = 0; argnum < nargs; argnum++)
486 /* FIXME what about structs? */
487 arg_len = TYPE_LENGTH (value_type (*args));
488 val = (char *) value_contents (*args);
490 while (regs_used < 2 && arg_len > 0)
492 write_register (regs_used, extract_unsigned_integer (val,
495 arg_len -= push_size;
501 write_memory (sp + stack_offset, val, push_size);
502 arg_len -= push_size;
504 stack_offset += push_size;
510 /* Make space for the flushback area. */
513 /* Push the return address that contains the magic breakpoint. */
515 write_memory_unsigned_integer (sp, push_size, bp_addr);
517 regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp);
522 static struct gdbarch *
523 mn10300_gdbarch_init (struct gdbarch_info info,
524 struct gdbarch_list *arches)
526 struct gdbarch *gdbarch;
527 struct gdbarch_tdep *tdep;
529 arches = gdbarch_list_lookup_by_info (arches, &info);
531 return arches->gdbarch;
533 tdep = xmalloc (sizeof (struct gdbarch_tdep));
534 gdbarch = gdbarch_alloc (&info, tdep);
536 switch (info.bfd_arch_info->mach)
539 case bfd_mach_mn10300:
540 set_gdbarch_register_name (gdbarch, mn10300_generic_register_name);
544 set_gdbarch_register_name (gdbarch, am33_register_name);
548 internal_error (__FILE__, __LINE__,
549 _("mn10300_gdbarch_init: Unknown mn10300 variant"));
554 set_gdbarch_num_regs (gdbarch, E_NUM_REGS);
555 set_gdbarch_register_type (gdbarch, mn10300_register_type);
556 set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
557 set_gdbarch_read_pc (gdbarch, mn10300_read_pc);
558 set_gdbarch_write_pc (gdbarch, mn10300_write_pc);
559 set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
560 set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
562 /* Stack unwinding. */
563 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
565 set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc);
566 /* decr_pc_after_break? */
568 set_gdbarch_print_insn (gdbarch, print_insn_mn10300);
571 /* MVS Note: at least the first one is deprecated! */
572 set_gdbarch_deprecated_use_struct_convention (gdbarch,
573 mn10300_use_struct_convention);
574 set_gdbarch_store_return_value (gdbarch, mn10300_store_return_value);
575 set_gdbarch_extract_return_value (gdbarch, mn10300_extract_return_value);
577 /* Stage 3 -- get target calls working. */
578 set_gdbarch_push_dummy_call (gdbarch, mn10300_push_dummy_call);
579 /* set_gdbarch_return_value (store, extract) */
582 mn10300_frame_unwind_init (gdbarch);
587 /* Dump out the mn10300 specific architecture information. */
590 mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
592 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
593 fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
598 _initialize_mn10300_tdep (void)
600 gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep);