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
;
316 CORE_ADDR pc
, start
, end
;
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
);
324 if (find_pc_partial_function (pc
, NULL
, &start
, &end
))
325 trad_frame_set_id (cache
,
326 frame_id_build (trad_frame_get_this_base (cache
),
329 trad_frame_set_id (cache
,
330 frame_id_build (trad_frame_get_this_base (cache
),
331 frame_func_unwind (next_frame
)));
333 (*this_prologue_cache
) = cache
;
337 /* Here is a dummy implementation. */
338 static struct frame_id
339 mn10300_unwind_dummy_id (struct gdbarch
*gdbarch
,
340 struct frame_info
*next_frame
)
342 return frame_id_build (frame_sp_unwind (next_frame
),
343 frame_pc_unwind (next_frame
));
346 /* Trad frame implementation. */
348 mn10300_frame_this_id (struct frame_info
*next_frame
,
349 void **this_prologue_cache
,
350 struct frame_id
*this_id
)
352 struct trad_frame_cache
*cache
=
353 mn10300_frame_unwind_cache (next_frame
, this_prologue_cache
);
355 trad_frame_get_id (cache
, this_id
);
359 mn10300_frame_prev_register (struct frame_info
*next_frame
,
360 void **this_prologue_cache
,
361 int regnum
, int *optimizedp
,
362 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
363 int *realnump
, void *bufferp
)
365 struct trad_frame_cache
*cache
=
366 mn10300_frame_unwind_cache (next_frame
, this_prologue_cache
);
368 trad_frame_get_register (cache
, next_frame
, regnum
, optimizedp
,
369 lvalp
, addrp
, realnump
, bufferp
);
371 trad_frame_get_prev_register (next_frame, cache->prev_regs, regnum,
372 optimizedp, lvalp, addrp, realnump, bufferp);
376 static const struct frame_unwind mn10300_frame_unwind
= {
378 mn10300_frame_this_id
,
379 mn10300_frame_prev_register
383 mn10300_frame_base_address (struct frame_info
*next_frame
,
384 void **this_prologue_cache
)
386 struct trad_frame_cache
*cache
=
387 mn10300_frame_unwind_cache (next_frame
, this_prologue_cache
);
389 return trad_frame_get_this_base (cache
);
392 static const struct frame_unwind
*
393 mn10300_frame_sniffer (struct frame_info
*next_frame
)
395 return &mn10300_frame_unwind
;
398 static const struct frame_base mn10300_frame_base
= {
399 &mn10300_frame_unwind
,
400 mn10300_frame_base_address
,
401 mn10300_frame_base_address
,
402 mn10300_frame_base_address
406 mn10300_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
410 frame_unwind_unsigned_register (next_frame
, E_PC_REGNUM
, &pc
);
415 mn10300_unwind_sp (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
419 frame_unwind_unsigned_register (next_frame
, E_SP_REGNUM
, &sp
);
424 mn10300_frame_unwind_init (struct gdbarch
*gdbarch
)
426 frame_unwind_append_sniffer (gdbarch
, dwarf2_frame_sniffer
);
427 frame_unwind_append_sniffer (gdbarch
, mn10300_frame_sniffer
);
428 frame_base_set_default (gdbarch
, &mn10300_frame_base
);
429 set_gdbarch_unwind_dummy_id (gdbarch
, mn10300_unwind_dummy_id
);
430 set_gdbarch_unwind_pc (gdbarch
, mn10300_unwind_pc
);
431 set_gdbarch_unwind_sp (gdbarch
, mn10300_unwind_sp
);
434 /* Function: push_dummy_call
436 * Set up machine state for a target call, including
437 * function arguments, stack, return address, etc.
442 mn10300_push_dummy_call (struct gdbarch
*gdbarch
,
443 struct value
*target_func
,
444 struct regcache
*regcache
,
446 int nargs
, struct value
**args
,
449 CORE_ADDR struct_addr
)
451 const int push_size
= register_size (gdbarch
, E_PC_REGNUM
);
454 int stack_offset
= 0;
456 char *val
, valbuf
[MAX_REGISTER_SIZE
];
459 /* FIXME temp, don't handle struct args at all. */
461 error ("Target doesn't handle struct return");
464 /* This should be a nop, but align the stack just in case something
465 went wrong. Stacks are four byte aligned on the mn10300. */
468 /* Now make space on the stack for the args.
470 XXX This doesn't appear to handle pass-by-invisible reference
472 regs_used
= struct_return
? 1 : 0;
473 for (len
= 0, argnum
= 0; argnum
< nargs
; argnum
++)
475 arg_len
= (TYPE_LENGTH (value_type (args
[argnum
])) + 3) & ~3;
477 if (TYPE_CODE (value_type (args
[argnum
])) == TYPE_CODE_STRUCT
)
478 error ("Target does not handle struct args");
480 while (regs_used
< 2 && arg_len
> 0)
483 arg_len
-= push_size
;
488 /* Allocate stack space. */
494 write_register (E_D0_REGNUM
, struct_addr
);
499 /* Push all arguments onto the stack. */
500 for (argnum
= 0; argnum
< nargs
; argnum
++)
502 /* FIXME what about structs? Unions? */
503 if (TYPE_CODE (value_type (*args
)) == TYPE_CODE_STRUCT
504 && TYPE_LENGTH (value_type (*args
)) > 8)
506 /* Change to pointer-to-type. */
508 store_unsigned_integer (valbuf
, push_size
,
509 VALUE_ADDRESS (*args
));
514 arg_len
= TYPE_LENGTH (value_type (*args
));
515 val
= (char *) value_contents (*args
);
518 while (regs_used
< 2 && arg_len
> 0)
520 write_register (regs_used
,
521 extract_unsigned_integer (val
, push_size
));
523 arg_len
-= push_size
;
529 write_memory (sp
+ stack_offset
, val
, push_size
);
530 arg_len
-= push_size
;
532 stack_offset
+= push_size
;
538 /* Make space for the flushback area. */
541 /* Push the return address that contains the magic breakpoint. */
543 write_memory_unsigned_integer (sp
, push_size
, bp_addr
);
545 regcache_cooked_write_unsigned (regcache
, E_SP_REGNUM
, sp
);
550 static struct gdbarch
*
551 mn10300_gdbarch_init (struct gdbarch_info info
,
552 struct gdbarch_list
*arches
)
554 struct gdbarch
*gdbarch
;
555 struct gdbarch_tdep
*tdep
;
557 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
559 return arches
->gdbarch
;
561 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
562 gdbarch
= gdbarch_alloc (&info
, tdep
);
564 switch (info
.bfd_arch_info
->mach
)
567 case bfd_mach_mn10300
:
568 set_gdbarch_register_name (gdbarch
, mn10300_generic_register_name
);
572 set_gdbarch_register_name (gdbarch
, am33_register_name
);
576 internal_error (__FILE__
, __LINE__
,
577 _("mn10300_gdbarch_init: Unknown mn10300 variant"));
582 set_gdbarch_num_regs (gdbarch
, E_NUM_REGS
);
583 set_gdbarch_register_type (gdbarch
, mn10300_register_type
);
584 set_gdbarch_skip_prologue (gdbarch
, mn10300_skip_prologue
);
585 set_gdbarch_read_pc (gdbarch
, mn10300_read_pc
);
586 set_gdbarch_write_pc (gdbarch
, mn10300_write_pc
);
587 set_gdbarch_pc_regnum (gdbarch
, E_PC_REGNUM
);
588 set_gdbarch_sp_regnum (gdbarch
, E_SP_REGNUM
);
590 /* Stack unwinding. */
591 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
593 set_gdbarch_breakpoint_from_pc (gdbarch
, mn10300_breakpoint_from_pc
);
594 /* decr_pc_after_break? */
596 set_gdbarch_print_insn (gdbarch
, print_insn_mn10300
);
599 /* MVS Note: at least the first one is deprecated! */
600 set_gdbarch_deprecated_use_struct_convention (gdbarch
,
601 mn10300_use_struct_convention
);
602 set_gdbarch_store_return_value (gdbarch
, mn10300_store_return_value
);
603 set_gdbarch_extract_return_value (gdbarch
, mn10300_extract_return_value
);
605 /* Stage 3 -- get target calls working. */
606 set_gdbarch_push_dummy_call (gdbarch
, mn10300_push_dummy_call
);
607 /* set_gdbarch_return_value (store, extract) */
610 mn10300_frame_unwind_init (gdbarch
);
615 /* Dump out the mn10300 specific architecture information. */
618 mn10300_dump_tdep (struct gdbarch
*current_gdbarch
, struct ui_file
*file
)
620 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
621 fprintf_unfiltered (file
, "mn10300_dump_tdep: am33_mode = %d\n",
626 _initialize_mn10300_tdep (void)
628 gdbarch_register (bfd_arch_mn10300
, mn10300_gdbarch_init
, mn10300_dump_tdep
);