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"
59 #include "frame-unwind.h"
60 #include "frame-base.h"
61 #include "trad-frame.h"
63 #include "dwarf2-frame.h"
90 /* Compute the alignment required by a type. */
93 mn10300_type_align (struct type
*type
)
97 switch (TYPE_CODE (type
))
102 case TYPE_CODE_RANGE
:
108 return TYPE_LENGTH (type
);
110 case TYPE_CODE_COMPLEX
:
111 return TYPE_LENGTH (type
) / 2;
113 case TYPE_CODE_STRUCT
:
114 case TYPE_CODE_UNION
:
115 for (i
= 0; i
< TYPE_NFIELDS (type
); i
++)
117 int falign
= mn10300_type_align (TYPE_FIELD_TYPE (type
, i
));
118 while (align
< falign
)
123 case TYPE_CODE_ARRAY
:
124 /* HACK! Structures containing arrays, even small ones, are not
125 elligible for returning in registers. */
128 case TYPE_CODE_TYPEDEF
:
129 return mn10300_type_align (check_typedef (type
));
132 internal_error (__FILE__
, __LINE__
, "bad switch");
136 /* MVS note this is deprecated. */
137 /* Should call_function allocate stack space for a struct return? */
140 mn10300_use_struct_convention (int gcc_p
, struct type
*type
)
142 /* Structures bigger than a pair of words can't be returned in
144 if (TYPE_LENGTH (type
) > 8)
147 switch (TYPE_CODE (type
))
149 case TYPE_CODE_STRUCT
:
150 case TYPE_CODE_UNION
:
151 /* Structures with a single field are handled as the field
153 if (TYPE_NFIELDS (type
) == 1)
154 return mn10300_use_struct_convention (gcc_p
,
155 TYPE_FIELD_TYPE (type
, 0));
157 /* Structures with word or double-word size are passed in memory, as
158 long as they require at least word alignment. */
159 if (mn10300_type_align (type
) >= 4)
164 /* Arrays are addressable, so they're never returned in
165 registers. This condition can only hold when the array is
166 the only field of a struct or union. */
167 case TYPE_CODE_ARRAY
:
170 case TYPE_CODE_TYPEDEF
:
171 return mn10300_use_struct_convention (gcc_p
, check_typedef (type
));
178 /* MVS note this is deprecated. */
180 mn10300_store_return_value (struct type
*type
,
181 struct regcache
*regcache
, const void *valbuf
)
183 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
184 int len
= TYPE_LENGTH (type
);
187 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
192 regsz
= register_size (gdbarch
, reg
);
195 regcache_raw_write_part (regcache
, reg
, 0, len
, valbuf
);
196 else if (len
<= 2 * regsz
)
198 regcache_raw_write (regcache
, reg
, valbuf
);
199 gdb_assert (regsz
== register_size (gdbarch
, reg
+ 1));
200 regcache_raw_write_part (regcache
, reg
+1, 0,
201 len
- regsz
, (char *) valbuf
+ regsz
);
204 internal_error (__FILE__
, __LINE__
,
205 "Cannot store return value %d bytes long.", len
);
208 /* MVS note deprecated. */
210 mn10300_extract_return_value (struct type
*type
,
211 struct regcache
*regcache
, void *valbuf
)
213 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
214 char buf
[MAX_REGISTER_SIZE
];
215 int len
= TYPE_LENGTH (type
);
218 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
223 regsz
= register_size (gdbarch
, reg
);
226 regcache_raw_read (regcache
, reg
, buf
);
227 memcpy (valbuf
, buf
, len
);
229 else if (len
<= 2 * regsz
)
231 regcache_raw_read (regcache
, reg
, buf
);
232 memcpy (valbuf
, buf
, regsz
);
233 gdb_assert (regsz
== register_size (gdbarch
, reg
+ 1));
234 regcache_raw_read (regcache
, reg
+ 1, buf
);
235 memcpy ((char *) valbuf
+ regsz
, buf
, len
- regsz
);
238 internal_error (__FILE__
, __LINE__
,
239 "Cannot extract return value %d bytes long.", len
);
243 register_name (int reg
, char **regs
, long sizeof_regs
)
245 if (reg
< 0 || reg
>= sizeof_regs
/ sizeof (regs
[0]))
252 mn10300_generic_register_name (int reg
)
254 static char *regs
[] =
255 { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
256 "sp", "pc", "mdr", "psw", "lir", "lar", "", "",
257 "", "", "", "", "", "", "", "",
258 "", "", "", "", "", "", "", "fp"
260 return register_name (reg
, regs
, sizeof regs
);
265 am33_register_name (int reg
)
267 static char *regs
[] =
268 { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
269 "sp", "pc", "mdr", "psw", "lir", "lar", "",
270 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
271 "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""
273 return register_name (reg
, regs
, sizeof regs
);
278 mn10300_register_type (struct gdbarch
*gdbarch
, int reg
)
280 return builtin_type_int
;
284 mn10300_read_pc (ptid_t ptid
)
286 return read_register_pid (E_PC_REGNUM
, ptid
);
290 mn10300_write_pc (CORE_ADDR val
, ptid_t ptid
)
292 return write_register_pid (E_PC_REGNUM
, val
, ptid
);
295 /* The breakpoint instruction must be the same size as the smallest
296 instruction in the instruction set.
298 The Matsushita mn10x00 processors have single byte instructions
299 so we need a single byte breakpoint. Matsushita hasn't defined
300 one, so we defined it ourselves. */
302 const static unsigned char *
303 mn10300_breakpoint_from_pc (CORE_ADDR
*bp_addr
, int *bp_size
)
305 static char breakpoint
[] = {0xff};
310 /* Function: skip_prologue
311 Return the address of the first inst past the prologue of the function. */
314 mn10300_skip_prologue (CORE_ADDR pc
)
316 /* FIXME: not implemented. */
317 /* First approximation, try simply using scan_prologue_using_sal. */
318 return skip_prologue_using_sal (pc
);
321 /* Simple frame_unwind_cache.
322 This finds the "extra info" for the frame. */
323 static struct trad_frame_cache
*
324 mn10300_frame_unwind_cache (struct frame_info
*next_frame
,
325 void **this_prologue_cache
)
327 struct trad_frame_cache
*cache
;
329 if (*this_prologue_cache
)
330 return (*this_prologue_cache
);
332 cache
= trad_frame_cache_zalloc (next_frame
);
333 trad_frame_set_id (cache
,
334 frame_id_build (gdbarch_unwind_sp (current_gdbarch
,
336 gdbarch_unwind_pc (current_gdbarch
,
339 /* FIXME: The SP isn't the frame base, so this is 0th approximation. */
340 /* FIXME: The A3 reg isn't always the frame register either, so this
341 is 1st approximation. */
342 trad_frame_set_this_base (cache
,
343 frame_unwind_register_signed (next_frame
,
345 (*this_prologue_cache
) = cache
;
349 /* Here is a dummy implementation. */
350 static struct frame_id
351 mn10300_dummy_unwind_dummy_id (struct gdbarch
*gdbarch
,
352 struct frame_info
*next_frame
)
354 return frame_id_build (0, 0);
357 /* Trad frame implementation. */
359 mn10300_frame_this_id (struct frame_info
*next_frame
,
360 void **this_prologue_cache
,
361 struct frame_id
*this_id
)
363 struct trad_frame_cache
*cache
=
364 mn10300_frame_unwind_cache (next_frame
, this_prologue_cache
);
366 trad_frame_get_id (cache
, this_id
);
370 mn10300_frame_prev_register (struct frame_info
*next_frame
,
371 void **this_prologue_cache
,
372 int regnum
, int *optimizedp
,
373 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
374 int *realnump
, void *bufferp
)
376 struct trad_frame_cache
*cache
=
377 mn10300_frame_unwind_cache (next_frame
, this_prologue_cache
);
379 trad_frame_get_register (cache
, next_frame
, regnum
, optimizedp
,
380 lvalp
, addrp
, realnump
, bufferp
);
382 trad_frame_get_prev_register (next_frame, cache->prev_regs, regnum,
383 optimizedp, lvalp, addrp, realnump, bufferp);
387 static const struct frame_unwind mn10300_frame_unwind
= {
389 mn10300_frame_this_id
,
390 mn10300_frame_prev_register
394 mn10300_frame_base_address (struct frame_info
*next_frame
,
395 void **this_prologue_cache
)
397 struct trad_frame_cache
*cache
=
398 mn10300_frame_unwind_cache (next_frame
, this_prologue_cache
);
400 return trad_frame_get_this_base (cache
);
403 static const struct frame_unwind
*
404 mn10300_frame_sniffer (struct frame_info
*next_frame
)
406 return &mn10300_frame_unwind
;
409 static const struct frame_base mn10300_frame_base
= {
410 &mn10300_frame_unwind
,
411 mn10300_frame_base_address
,
412 mn10300_frame_base_address
,
413 mn10300_frame_base_address
417 mn10300_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
421 frame_unwind_unsigned_register (next_frame
, E_PC_REGNUM
, &pc
);
426 mn10300_unwind_sp (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
430 frame_unwind_unsigned_register (next_frame
, E_SP_REGNUM
, &sp
);
435 mn10300_frame_unwind_init (struct gdbarch
*gdbarch
)
437 frame_unwind_append_sniffer (gdbarch
, dwarf2_frame_sniffer
);
438 frame_unwind_append_sniffer (gdbarch
, mn10300_frame_sniffer
);
439 frame_base_set_default (gdbarch
, &mn10300_frame_base
);
440 set_gdbarch_unwind_dummy_id (gdbarch
, mn10300_dummy_unwind_dummy_id
);
441 set_gdbarch_unwind_pc (gdbarch
, mn10300_unwind_pc
);
442 set_gdbarch_unwind_sp (gdbarch
, mn10300_unwind_sp
);
445 static struct gdbarch
*
446 mn10300_gdbarch_init (struct gdbarch_info info
,
447 struct gdbarch_list
*arches
)
449 struct gdbarch
*gdbarch
;
451 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
453 return arches
->gdbarch
;
454 gdbarch
= gdbarch_alloc (&info
, NULL
);
456 switch (info
.bfd_arch_info
->mach
)
459 case bfd_mach_mn10300
:
460 set_gdbarch_register_name (gdbarch
, mn10300_generic_register_name
);
463 set_gdbarch_register_name (gdbarch
, am33_register_name
);
466 internal_error (__FILE__
, __LINE__
,
467 "mn10300_gdbarch_init: Unknown mn10300 variant");
472 set_gdbarch_num_regs (gdbarch
, E_NUM_REGS
);
473 set_gdbarch_register_type (gdbarch
, mn10300_register_type
);
474 set_gdbarch_skip_prologue (gdbarch
, mn10300_skip_prologue
);
475 set_gdbarch_read_pc (gdbarch
, mn10300_read_pc
);
476 set_gdbarch_write_pc (gdbarch
, mn10300_write_pc
);
477 set_gdbarch_pc_regnum (gdbarch
, E_PC_REGNUM
);
478 set_gdbarch_sp_regnum (gdbarch
, E_SP_REGNUM
);
480 /* Stack unwinding. */
481 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
483 set_gdbarch_breakpoint_from_pc (gdbarch
, mn10300_breakpoint_from_pc
);
484 /* decr_pc_after_break? */
486 set_gdbarch_print_insn (gdbarch
, print_insn_mn10300
);
489 /* MVS Note: at least the first one is deprecated! */
490 set_gdbarch_deprecated_use_struct_convention (gdbarch
,
491 mn10300_use_struct_convention
);
492 set_gdbarch_store_return_value (gdbarch
, mn10300_store_return_value
);
493 set_gdbarch_extract_return_value (gdbarch
, mn10300_extract_return_value
);
495 mn10300_frame_unwind_init (gdbarch
);
501 _initialize_mn10300_tdep (void)
503 register_gdbarch_init (bfd_arch_mn10300
, mn10300_gdbarch_init
);