Commit | Line | Data |
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342ee437 MS |
1 | /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. |
2 | ||
63a09be5 MS |
3 | Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
4 | Free Software Foundation, Inc. | |
342ee437 MS |
5 | |
6 | This file is part of GDB. | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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. */ | |
22 | ||
342ee437 MS |
23 | #include "defs.h" |
24 | #include "arch-utils.h" | |
25 | #include "dis-asm.h" | |
26 | #include "gdbtypes.h" | |
27 | #include "regcache.h" | |
28 | #include "gdb_string.h" | |
29 | #include "gdb_assert.h" | |
30 | #include "gdbcore.h" /* for write_memory_unsigned_integer */ | |
31 | #include "value.h" | |
32 | #include "gdbtypes.h" | |
33 | #include "frame.h" | |
34 | #include "frame-unwind.h" | |
35 | #include "frame-base.h" | |
36 | #include "trad-frame.h" | |
37 | #include "symtab.h" | |
38 | #include "dwarf2-frame.h" | |
39 | #include "regcache.h" | |
697e3bc9 | 40 | #include "osabi.h" |
342ee437 MS |
41 | |
42 | #include "mn10300-tdep.h" | |
43 | ||
9cacebf5 MS |
44 | /* Forward decl. */ |
45 | extern struct trad_frame_cache *mn10300_frame_unwind_cache (struct frame_info*, | |
46 | void **); | |
342ee437 MS |
47 | |
48 | /* Compute the alignment required by a type. */ | |
49 | ||
50 | static int | |
51 | mn10300_type_align (struct type *type) | |
52 | { | |
53 | int i, align = 1; | |
54 | ||
55 | switch (TYPE_CODE (type)) | |
56 | { | |
57 | case TYPE_CODE_INT: | |
58 | case TYPE_CODE_ENUM: | |
59 | case TYPE_CODE_SET: | |
60 | case TYPE_CODE_RANGE: | |
61 | case TYPE_CODE_CHAR: | |
62 | case TYPE_CODE_BOOL: | |
63 | case TYPE_CODE_FLT: | |
64 | case TYPE_CODE_PTR: | |
65 | case TYPE_CODE_REF: | |
66 | return TYPE_LENGTH (type); | |
67 | ||
68 | case TYPE_CODE_COMPLEX: | |
69 | return TYPE_LENGTH (type) / 2; | |
70 | ||
71 | case TYPE_CODE_STRUCT: | |
72 | case TYPE_CODE_UNION: | |
73 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
74 | { | |
75 | int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i)); | |
76 | while (align < falign) | |
77 | align <<= 1; | |
78 | } | |
79 | return align; | |
80 | ||
81 | case TYPE_CODE_ARRAY: | |
82 | /* HACK! Structures containing arrays, even small ones, are not | |
83 | elligible for returning in registers. */ | |
84 | return 256; | |
85 | ||
86 | case TYPE_CODE_TYPEDEF: | |
87 | return mn10300_type_align (check_typedef (type)); | |
88 | ||
89 | default: | |
90 | internal_error (__FILE__, __LINE__, _("bad switch")); | |
91 | } | |
92 | } | |
93 | ||
94 | /* MVS note this is deprecated. */ | |
95 | /* Should call_function allocate stack space for a struct return? */ | |
96 | /* gcc_p unused */ | |
97 | static int | |
98 | mn10300_use_struct_convention (int gcc_p, struct type *type) | |
99 | { | |
100 | /* Structures bigger than a pair of words can't be returned in | |
101 | registers. */ | |
102 | if (TYPE_LENGTH (type) > 8) | |
103 | return 1; | |
104 | ||
105 | switch (TYPE_CODE (type)) | |
106 | { | |
107 | case TYPE_CODE_STRUCT: | |
108 | case TYPE_CODE_UNION: | |
109 | /* Structures with a single field are handled as the field | |
110 | itself. */ | |
111 | if (TYPE_NFIELDS (type) == 1) | |
112 | return mn10300_use_struct_convention (gcc_p, | |
113 | TYPE_FIELD_TYPE (type, 0)); | |
114 | ||
115 | /* Structures with word or double-word size are passed in memory, as | |
116 | long as they require at least word alignment. */ | |
117 | if (mn10300_type_align (type) >= 4) | |
118 | return 0; | |
119 | ||
120 | return 1; | |
121 | ||
122 | /* Arrays are addressable, so they're never returned in | |
123 | registers. This condition can only hold when the array is | |
124 | the only field of a struct or union. */ | |
125 | case TYPE_CODE_ARRAY: | |
126 | return 1; | |
127 | ||
128 | case TYPE_CODE_TYPEDEF: | |
129 | return mn10300_use_struct_convention (gcc_p, check_typedef (type)); | |
130 | ||
131 | default: | |
132 | return 0; | |
133 | } | |
134 | } | |
135 | ||
136 | /* MVS note this is deprecated. */ | |
137 | static void | |
138 | mn10300_store_return_value (struct type *type, | |
139 | struct regcache *regcache, const void *valbuf) | |
140 | { | |
141 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
142 | int len = TYPE_LENGTH (type); | |
143 | int reg, regsz; | |
144 | ||
145 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
146 | reg = 4; | |
147 | else | |
148 | reg = 0; | |
149 | ||
150 | regsz = register_size (gdbarch, reg); | |
151 | ||
152 | if (len <= regsz) | |
153 | regcache_raw_write_part (regcache, reg, 0, len, valbuf); | |
154 | else if (len <= 2 * regsz) | |
155 | { | |
156 | regcache_raw_write (regcache, reg, valbuf); | |
157 | gdb_assert (regsz == register_size (gdbarch, reg + 1)); | |
158 | regcache_raw_write_part (regcache, reg+1, 0, | |
159 | len - regsz, (char *) valbuf + regsz); | |
160 | } | |
161 | else | |
162 | internal_error (__FILE__, __LINE__, | |
163 | _("Cannot store return value %d bytes long."), len); | |
164 | } | |
165 | ||
166 | /* MVS note deprecated. */ | |
167 | static void | |
168 | mn10300_extract_return_value (struct type *type, | |
169 | struct regcache *regcache, void *valbuf) | |
170 | { | |
171 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
172 | char buf[MAX_REGISTER_SIZE]; | |
173 | int len = TYPE_LENGTH (type); | |
174 | int reg, regsz; | |
175 | ||
176 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
177 | reg = 4; | |
178 | else | |
179 | reg = 0; | |
180 | ||
181 | regsz = register_size (gdbarch, reg); | |
182 | if (len <= regsz) | |
183 | { | |
184 | regcache_raw_read (regcache, reg, buf); | |
185 | memcpy (valbuf, buf, len); | |
186 | } | |
187 | else if (len <= 2 * regsz) | |
188 | { | |
189 | regcache_raw_read (regcache, reg, buf); | |
190 | memcpy (valbuf, buf, regsz); | |
191 | gdb_assert (regsz == register_size (gdbarch, reg + 1)); | |
192 | regcache_raw_read (regcache, reg + 1, buf); | |
193 | memcpy ((char *) valbuf + regsz, buf, len - regsz); | |
194 | } | |
195 | else | |
196 | internal_error (__FILE__, __LINE__, | |
197 | _("Cannot extract return value %d bytes long."), len); | |
198 | } | |
199 | ||
200 | static char * | |
201 | register_name (int reg, char **regs, long sizeof_regs) | |
202 | { | |
203 | if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0])) | |
204 | return NULL; | |
205 | else | |
206 | return regs[reg]; | |
207 | } | |
208 | ||
209 | static const char * | |
210 | mn10300_generic_register_name (int reg) | |
211 | { | |
212 | static char *regs[] = | |
213 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
214 | "sp", "pc", "mdr", "psw", "lir", "lar", "", "", | |
215 | "", "", "", "", "", "", "", "", | |
216 | "", "", "", "", "", "", "", "fp" | |
217 | }; | |
218 | return register_name (reg, regs, sizeof regs); | |
219 | } | |
220 | ||
221 | ||
222 | static const char * | |
223 | am33_register_name (int reg) | |
224 | { | |
225 | static char *regs[] = | |
226 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
227 | "sp", "pc", "mdr", "psw", "lir", "lar", "", | |
228 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
229 | "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", "" | |
230 | }; | |
231 | return register_name (reg, regs, sizeof regs); | |
232 | } | |
233 | ||
234 | ||
235 | static struct type * | |
236 | mn10300_register_type (struct gdbarch *gdbarch, int reg) | |
237 | { | |
238 | return builtin_type_int; | |
239 | } | |
240 | ||
241 | static CORE_ADDR | |
242 | mn10300_read_pc (ptid_t ptid) | |
243 | { | |
244 | return read_register_pid (E_PC_REGNUM, ptid); | |
245 | } | |
246 | ||
247 | static void | |
248 | mn10300_write_pc (CORE_ADDR val, ptid_t ptid) | |
249 | { | |
250 | return write_register_pid (E_PC_REGNUM, val, ptid); | |
251 | } | |
252 | ||
253 | /* The breakpoint instruction must be the same size as the smallest | |
254 | instruction in the instruction set. | |
255 | ||
256 | The Matsushita mn10x00 processors have single byte instructions | |
257 | so we need a single byte breakpoint. Matsushita hasn't defined | |
258 | one, so we defined it ourselves. */ | |
259 | ||
260 | const static unsigned char * | |
261 | mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size) | |
262 | { | |
263 | static char breakpoint[] = {0xff}; | |
264 | *bp_size = 1; | |
265 | return breakpoint; | |
266 | } | |
267 | ||
9cacebf5 MS |
268 | /* |
269 | * Frame Extra Info: | |
270 | * | |
271 | * status -- actually frame type (SP, FP, or last frame) | |
272 | * stack size -- offset to the next frame | |
273 | * | |
274 | * The former might ultimately be stored in the frame_base. | |
275 | * Seems like there'd be a way to store the later too. | |
276 | * | |
277 | * Temporarily supply empty stub functions as place holders. | |
278 | */ | |
279 | ||
280 | static void | |
281 | my_frame_is_in_sp (struct frame_info *fi, void **this_cache) | |
282 | { | |
283 | struct trad_frame_cache *cache = mn10300_frame_unwind_cache (fi, this_cache); | |
284 | trad_frame_set_this_base (cache, | |
285 | frame_unwind_register_unsigned (fi, | |
286 | E_SP_REGNUM)); | |
287 | } | |
288 | ||
289 | static void | |
290 | my_frame_is_in_fp (struct frame_info *fi, void **this_cache) | |
291 | { | |
292 | struct trad_frame_cache *cache = mn10300_frame_unwind_cache (fi, this_cache); | |
293 | trad_frame_set_this_base (cache, | |
294 | frame_unwind_register_unsigned (fi, | |
295 | E_A3_REGNUM)); | |
296 | } | |
297 | ||
298 | static void | |
299 | my_frame_is_last (struct frame_info *fi) | |
300 | { | |
301 | } | |
302 | ||
303 | static int | |
304 | is_my_frame_in_sp (struct frame_info *fi) | |
305 | { | |
306 | return 0; | |
307 | } | |
308 | ||
309 | static int | |
310 | is_my_frame_in_fp (struct frame_info *fi) | |
311 | { | |
312 | return 0; | |
313 | } | |
314 | ||
315 | static int | |
316 | is_my_frame_last (struct frame_info *fi) | |
317 | { | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static void | |
322 | set_my_stack_size (struct frame_info *fi, CORE_ADDR size) | |
323 | { | |
324 | } | |
325 | ||
326 | ||
327 | /* Set offsets of registers saved by movm instruction. | |
328 | This is a helper function for mn10300_analyze_prologue. */ | |
329 | ||
330 | static void | |
331 | set_movm_offsets (struct frame_info *fi, | |
332 | void **this_cache, | |
333 | int movm_args) | |
334 | { | |
335 | struct trad_frame_cache *cache; | |
336 | int offset = 0; | |
337 | CORE_ADDR base; | |
338 | ||
339 | if (fi == NULL || this_cache == NULL) | |
340 | return; | |
341 | ||
342 | cache = mn10300_frame_unwind_cache (fi, this_cache); | |
343 | if (cache == NULL) | |
344 | return; | |
345 | ||
346 | base = trad_frame_get_this_base (cache); | |
347 | if (movm_args & movm_other_bit) | |
348 | { | |
349 | /* The `other' bit leaves a blank area of four bytes at the | |
350 | beginning of its block of saved registers, making it 32 bytes | |
351 | long in total. */ | |
352 | trad_frame_set_reg_addr (cache, E_LAR_REGNUM, base + offset + 4); | |
353 | trad_frame_set_reg_addr (cache, E_LIR_REGNUM, base + offset + 8); | |
354 | trad_frame_set_reg_addr (cache, E_MDR_REGNUM, base + offset + 12); | |
355 | trad_frame_set_reg_addr (cache, E_A0_REGNUM + 1, base + offset + 16); | |
356 | trad_frame_set_reg_addr (cache, E_A0_REGNUM, base + offset + 20); | |
357 | trad_frame_set_reg_addr (cache, E_D0_REGNUM + 1, base + offset + 24); | |
358 | trad_frame_set_reg_addr (cache, E_D0_REGNUM, base + offset + 28); | |
359 | offset += 32; | |
360 | } | |
361 | ||
362 | if (movm_args & movm_a3_bit) | |
363 | { | |
364 | trad_frame_set_reg_addr (cache, E_A3_REGNUM, base + offset); | |
365 | offset += 4; | |
366 | } | |
367 | if (movm_args & movm_a2_bit) | |
368 | { | |
369 | trad_frame_set_reg_addr (cache, E_A2_REGNUM, base + offset); | |
370 | offset += 4; | |
371 | } | |
372 | if (movm_args & movm_d3_bit) | |
373 | { | |
374 | trad_frame_set_reg_addr (cache, E_D3_REGNUM, base + offset); | |
375 | offset += 4; | |
376 | } | |
377 | if (movm_args & movm_d2_bit) | |
378 | { | |
379 | trad_frame_set_reg_addr (cache, E_D2_REGNUM, base + offset); | |
380 | offset += 4; | |
381 | } | |
382 | if (AM33_MODE) | |
383 | { | |
384 | if (movm_args & movm_exother_bit) | |
385 | { | |
386 | trad_frame_set_reg_addr (cache, E_MCVF_REGNUM, base + offset); | |
387 | trad_frame_set_reg_addr (cache, E_MCRL_REGNUM, base + offset + 4); | |
388 | trad_frame_set_reg_addr (cache, E_MCRH_REGNUM, base + offset + 8); | |
389 | trad_frame_set_reg_addr (cache, E_MDRQ_REGNUM, base + offset + 12); | |
390 | trad_frame_set_reg_addr (cache, E_E1_REGNUM, base + offset + 16); | |
391 | trad_frame_set_reg_addr (cache, E_E0_REGNUM, base + offset + 20); | |
392 | offset += 24; | |
393 | } | |
394 | if (movm_args & movm_exreg1_bit) | |
395 | { | |
396 | trad_frame_set_reg_addr (cache, E_E7_REGNUM, base + offset); | |
397 | trad_frame_set_reg_addr (cache, E_E6_REGNUM, base + offset + 4); | |
398 | trad_frame_set_reg_addr (cache, E_E5_REGNUM, base + offset + 8); | |
399 | trad_frame_set_reg_addr (cache, E_E4_REGNUM, base + offset + 12); | |
400 | offset += 16; | |
401 | } | |
402 | if (movm_args & movm_exreg0_bit) | |
403 | { | |
404 | trad_frame_set_reg_addr (cache, E_E3_REGNUM, base + offset); | |
405 | trad_frame_set_reg_addr (cache, E_E2_REGNUM, base + offset + 4); | |
406 | offset += 8; | |
407 | } | |
408 | } | |
409 | /* The last (or first) thing on the stack will be the PC. */ | |
410 | trad_frame_set_reg_addr (cache, E_PC_REGNUM, base + offset); | |
411 | /* Save the SP in the 'traditional' way. | |
412 | This will be the same location where the PC is saved. */ | |
413 | trad_frame_set_reg_value (cache, E_SP_REGNUM, base + offset); | |
414 | } | |
415 | ||
416 | /* The main purpose of this file is dealing with prologues to extract | |
417 | information about stack frames and saved registers. | |
418 | ||
419 | In gcc/config/mn13000/mn10300.c, the expand_prologue prologue | |
420 | function is pretty readable, and has a nice explanation of how the | |
421 | prologue is generated. The prologues generated by that code will | |
422 | have the following form (NOTE: the current code doesn't handle all | |
423 | this!): | |
424 | ||
425 | + If this is an old-style varargs function, then its arguments | |
426 | need to be flushed back to the stack: | |
427 | ||
428 | mov d0,(4,sp) | |
429 | mov d1,(4,sp) | |
430 | ||
431 | + If we use any of the callee-saved registers, save them now. | |
432 | ||
433 | movm [some callee-saved registers],(sp) | |
434 | ||
435 | + If we have any floating-point registers to save: | |
436 | ||
437 | - Decrement the stack pointer to reserve space for the registers. | |
438 | If the function doesn't need a frame pointer, we may combine | |
439 | this with the adjustment that reserves space for the frame. | |
440 | ||
441 | add -SIZE, sp | |
442 | ||
443 | - Save the floating-point registers. We have two possible | |
444 | strategies: | |
445 | ||
446 | . Save them at fixed offset from the SP: | |
447 | ||
448 | fmov fsN,(OFFSETN,sp) | |
449 | fmov fsM,(OFFSETM,sp) | |
450 | ... | |
451 | ||
452 | Note that, if OFFSETN happens to be zero, you'll get the | |
453 | different opcode: fmov fsN,(sp) | |
454 | ||
455 | . Or, set a0 to the start of the save area, and then use | |
456 | post-increment addressing to save the FP registers. | |
457 | ||
458 | mov sp, a0 | |
459 | add SIZE, a0 | |
460 | fmov fsN,(a0+) | |
461 | fmov fsM,(a0+) | |
462 | ... | |
463 | ||
464 | + If the function needs a frame pointer, we set it here. | |
465 | ||
466 | mov sp, a3 | |
467 | ||
468 | + Now we reserve space for the stack frame proper. This could be | |
469 | merged into the `add -SIZE, sp' instruction for FP saves up | |
470 | above, unless we needed to set the frame pointer in the previous | |
471 | step, or the frame is so large that allocating the whole thing at | |
472 | once would put the FP register save slots out of reach of the | |
473 | addressing mode (128 bytes). | |
474 | ||
475 | add -SIZE, sp | |
476 | ||
477 | One day we might keep the stack pointer constant, that won't | |
478 | change the code for prologues, but it will make the frame | |
479 | pointerless case much more common. */ | |
480 | ||
481 | /* Analyze the prologue to determine where registers are saved, | |
482 | the end of the prologue, etc etc. Return the end of the prologue | |
483 | scanned. | |
484 | ||
485 | We store into FI (if non-null) several tidbits of information: | |
486 | ||
487 | * stack_size -- size of this stack frame. Note that if we stop in | |
488 | certain parts of the prologue/epilogue we may claim the size of the | |
489 | current frame is zero. This happens when the current frame has | |
490 | not been allocated yet or has already been deallocated. | |
491 | ||
492 | * fsr -- Addresses of registers saved in the stack by this frame. | |
493 | ||
494 | * status -- A (relatively) generic status indicator. It's a bitmask | |
495 | with the following bits: | |
496 | ||
497 | MY_FRAME_IN_SP: The base of the current frame is actually in | |
498 | the stack pointer. This can happen for frame pointerless | |
499 | functions, or cases where we're stopped in the prologue/epilogue | |
500 | itself. For these cases mn10300_analyze_prologue will need up | |
501 | update fi->frame before returning or analyzing the register | |
502 | save instructions. | |
503 | ||
504 | MY_FRAME_IN_FP: The base of the current frame is in the | |
505 | frame pointer register ($a3). | |
506 | ||
507 | NO_MORE_FRAMES: Set this if the current frame is "start" or | |
508 | if the first instruction looks like mov <imm>,sp. This tells | |
509 | frame chain to not bother trying to unwind past this frame. */ | |
510 | ||
511 | static CORE_ADDR | |
512 | mn10300_analyze_prologue (struct frame_info *fi, | |
513 | void **this_cache, | |
514 | CORE_ADDR pc) | |
515 | { | |
516 | CORE_ADDR func_addr, func_end, addr, stop; | |
517 | long stack_size; | |
518 | int imm_size; | |
519 | unsigned char buf[4]; | |
520 | int status, movm_args = 0; | |
521 | char *name; | |
522 | ||
523 | /* Use the PC in the frame if it's provided to look up the | |
524 | start of this function. | |
525 | ||
526 | Note: kevinb/2003-07-16: We used to do the following here: | |
527 | pc = (fi ? get_frame_pc (fi) : pc); | |
528 | But this is (now) badly broken when called from analyze_dummy_frame(). | |
529 | */ | |
530 | if (fi) | |
531 | { | |
532 | pc = (pc ? pc : get_frame_pc (fi)); | |
533 | /* At the start of a function our frame is in the stack pointer. */ | |
534 | my_frame_is_in_sp (fi, this_cache); | |
535 | } | |
536 | ||
537 | /* Find the start of this function. */ | |
538 | status = find_pc_partial_function (pc, &name, &func_addr, &func_end); | |
539 | ||
540 | /* Do nothing if we couldn't find the start of this function | |
541 | ||
542 | MVS: comment went on to say "or if we're stopped at the first | |
543 | instruction in the prologue" -- but code doesn't reflect that, | |
544 | and I don't want to do that anyway. */ | |
545 | if (status == 0) | |
546 | { | |
547 | return pc; | |
548 | } | |
549 | ||
550 | /* If we're in start, then give up. */ | |
551 | if (strcmp (name, "start") == 0) | |
552 | { | |
553 | if (fi != NULL) | |
554 | my_frame_is_last (fi); | |
555 | return pc; | |
556 | } | |
557 | ||
558 | #if 0 | |
559 | /* Get the next two bytes into buf, we need two because rets is a two | |
560 | byte insn and the first isn't enough to uniquely identify it. */ | |
561 | status = deprecated_read_memory_nobpt (pc, buf, 2); | |
562 | if (status != 0) | |
563 | return pc; | |
564 | ||
565 | /* Note: kevinb/2003-07-16: We shouldn't be making these sorts of | |
566 | changes to the frame in prologue examination code. */ | |
567 | /* If we're physically on an "rets" instruction, then our frame has | |
568 | already been deallocated. Note this can also be true for retf | |
569 | and ret if they specify a size of zero. | |
570 | ||
571 | In this case fi->frame is bogus, we need to fix it. */ | |
572 | if (fi && buf[0] == 0xf0 && buf[1] == 0xfc) | |
573 | { | |
574 | if (get_next_frame (fi) == NULL) | |
575 | deprecated_update_frame_base_hack (fi, read_sp ()); | |
576 | return get_frame_pc (fi); | |
577 | } | |
578 | ||
579 | /* Similarly if we're stopped on the first insn of a prologue as our | |
580 | frame hasn't been allocated yet. */ | |
581 | if (fi && get_frame_pc (fi) == func_addr) | |
582 | { | |
583 | if (get_next_frame (fi) == NULL) | |
584 | deprecated_update_frame_base_hack (fi, read_sp ()); | |
585 | return get_frame_pc (fi); | |
586 | } | |
587 | #endif | |
588 | ||
589 | /* NOTE: from here on, we don't want to return without jumping to | |
590 | finish_prologue. */ | |
591 | ||
592 | ||
593 | /* Figure out where to stop scanning. */ | |
594 | stop = fi ? pc : func_end; | |
595 | ||
596 | /* Don't walk off the end of the function. */ | |
597 | stop = stop > func_end ? func_end : stop; | |
598 | ||
599 | /* Start scanning on the first instruction of this function. */ | |
600 | addr = func_addr; | |
601 | ||
602 | /* Suck in two bytes. */ | |
603 | if (addr + 2 >= stop | |
604 | || (status = deprecated_read_memory_nobpt (addr, buf, 2)) != 0) | |
605 | goto finish_prologue; | |
606 | ||
607 | /* First see if this insn sets the stack pointer from a register; if | |
608 | so, it's probably the initialization of the stack pointer in _start, | |
609 | so mark this as the bottom-most frame. */ | |
610 | if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0) | |
611 | { | |
612 | if (fi) | |
613 | my_frame_is_last (fi); | |
614 | goto finish_prologue; | |
615 | } | |
616 | ||
617 | /* Now look for movm [regs],sp, which saves the callee saved registers. | |
618 | ||
619 | At this time we don't know if fi->frame is valid, so we only note | |
620 | that we encountered a movm instruction. Later, we'll set the entries | |
621 | in fsr.regs as needed. */ | |
622 | if (buf[0] == 0xcf) | |
623 | { | |
624 | /* Extract the register list for the movm instruction. */ | |
625 | movm_args = buf[1]; | |
626 | ||
627 | addr += 2; | |
628 | ||
629 | /* Quit now if we're beyond the stop point. */ | |
630 | if (addr >= stop) | |
631 | goto finish_prologue; | |
632 | ||
633 | /* Get the next two bytes so the prologue scan can continue. */ | |
634 | status = deprecated_read_memory_nobpt (addr, buf, 2); | |
635 | if (status != 0) | |
636 | goto finish_prologue; | |
637 | } | |
638 | ||
639 | /* Now see if we set up a frame pointer via "mov sp,a3" */ | |
640 | if (buf[0] == 0x3f) | |
641 | { | |
642 | addr += 1; | |
643 | ||
644 | /* The frame pointer is now valid. */ | |
645 | if (fi) | |
646 | { | |
647 | my_frame_is_in_fp (fi, this_cache); | |
648 | } | |
649 | ||
650 | /* Quit now if we're beyond the stop point. */ | |
651 | if (addr >= stop) | |
652 | goto finish_prologue; | |
653 | ||
654 | /* Get two more bytes so scanning can continue. */ | |
655 | status = deprecated_read_memory_nobpt (addr, buf, 2); | |
656 | if (status != 0) | |
657 | goto finish_prologue; | |
658 | } | |
659 | ||
660 | /* Next we should allocate the local frame. No more prologue insns | |
661 | are found after allocating the local frame. | |
662 | ||
663 | Search for add imm8,sp (0xf8feXX) | |
664 | or add imm16,sp (0xfafeXXXX) | |
665 | or add imm32,sp (0xfcfeXXXXXXXX). | |
666 | ||
667 | If none of the above was found, then this prologue has no | |
668 | additional stack. */ | |
669 | ||
670 | imm_size = 0; | |
671 | if (buf[0] == 0xf8 && buf[1] == 0xfe) | |
672 | imm_size = 1; | |
673 | else if (buf[0] == 0xfa && buf[1] == 0xfe) | |
674 | imm_size = 2; | |
675 | else if (buf[0] == 0xfc && buf[1] == 0xfe) | |
676 | imm_size = 4; | |
677 | ||
678 | if (imm_size != 0) | |
679 | { | |
680 | /* Suck in imm_size more bytes, they'll hold the size of the | |
681 | current frame. */ | |
682 | status = deprecated_read_memory_nobpt (addr + 2, buf, imm_size); | |
683 | if (status != 0) | |
684 | goto finish_prologue; | |
685 | ||
686 | /* Note the size of the stack in the frame info structure. */ | |
687 | stack_size = extract_signed_integer (buf, imm_size); | |
688 | if (fi) | |
689 | set_my_stack_size (fi, stack_size); | |
690 | ||
691 | /* We just consumed 2 + imm_size bytes. */ | |
692 | addr += 2 + imm_size; | |
693 | ||
694 | /* No more prologue insns follow, so begin preparation to return. */ | |
695 | goto finish_prologue; | |
696 | } | |
697 | /* Do the essentials and get out of here. */ | |
698 | finish_prologue: | |
699 | /* Note if/where callee saved registers were saved. */ | |
700 | if (fi) | |
701 | set_movm_offsets (fi, this_cache, movm_args); | |
702 | return addr; | |
703 | } | |
704 | ||
342ee437 MS |
705 | /* Function: skip_prologue |
706 | Return the address of the first inst past the prologue of the function. */ | |
707 | ||
708 | static CORE_ADDR | |
709 | mn10300_skip_prologue (CORE_ADDR pc) | |
710 | { | |
9b3c083c | 711 | return mn10300_analyze_prologue (NULL, NULL, pc); |
342ee437 MS |
712 | } |
713 | ||
714 | /* Simple frame_unwind_cache. | |
715 | This finds the "extra info" for the frame. */ | |
716 | struct trad_frame_cache * | |
717 | mn10300_frame_unwind_cache (struct frame_info *next_frame, | |
718 | void **this_prologue_cache) | |
719 | { | |
720 | struct trad_frame_cache *cache; | |
1fb1ca27 | 721 | CORE_ADDR pc, start, end; |
342ee437 MS |
722 | |
723 | if (*this_prologue_cache) | |
724 | return (*this_prologue_cache); | |
725 | ||
726 | cache = trad_frame_cache_zalloc (next_frame); | |
727 | pc = gdbarch_unwind_pc (current_gdbarch, next_frame); | |
728 | mn10300_analyze_prologue (next_frame, (void **) &cache, pc); | |
1fb1ca27 MS |
729 | if (find_pc_partial_function (pc, NULL, &start, &end)) |
730 | trad_frame_set_id (cache, | |
731 | frame_id_build (trad_frame_get_this_base (cache), | |
732 | start)); | |
733 | else | |
734 | trad_frame_set_id (cache, | |
735 | frame_id_build (trad_frame_get_this_base (cache), | |
736 | frame_func_unwind (next_frame))); | |
342ee437 MS |
737 | |
738 | (*this_prologue_cache) = cache; | |
739 | return cache; | |
740 | } | |
741 | ||
742 | /* Here is a dummy implementation. */ | |
743 | static struct frame_id | |
744 | mn10300_unwind_dummy_id (struct gdbarch *gdbarch, | |
745 | struct frame_info *next_frame) | |
746 | { | |
747 | return frame_id_build (frame_sp_unwind (next_frame), | |
748 | frame_pc_unwind (next_frame)); | |
749 | } | |
750 | ||
751 | /* Trad frame implementation. */ | |
752 | static void | |
753 | mn10300_frame_this_id (struct frame_info *next_frame, | |
754 | void **this_prologue_cache, | |
755 | struct frame_id *this_id) | |
756 | { | |
757 | struct trad_frame_cache *cache = | |
758 | mn10300_frame_unwind_cache (next_frame, this_prologue_cache); | |
759 | ||
760 | trad_frame_get_id (cache, this_id); | |
761 | } | |
762 | ||
763 | static void | |
764 | mn10300_frame_prev_register (struct frame_info *next_frame, | |
765 | void **this_prologue_cache, | |
766 | int regnum, int *optimizedp, | |
767 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
768 | int *realnump, void *bufferp) | |
769 | { | |
770 | struct trad_frame_cache *cache = | |
771 | mn10300_frame_unwind_cache (next_frame, this_prologue_cache); | |
772 | ||
773 | trad_frame_get_register (cache, next_frame, regnum, optimizedp, | |
774 | lvalp, addrp, realnump, bufferp); | |
775 | /* Or... | |
776 | trad_frame_get_prev_register (next_frame, cache->prev_regs, regnum, | |
777 | optimizedp, lvalp, addrp, realnump, bufferp); | |
778 | */ | |
779 | } | |
780 | ||
781 | static const struct frame_unwind mn10300_frame_unwind = { | |
782 | NORMAL_FRAME, | |
783 | mn10300_frame_this_id, | |
784 | mn10300_frame_prev_register | |
785 | }; | |
786 | ||
787 | static CORE_ADDR | |
788 | mn10300_frame_base_address (struct frame_info *next_frame, | |
789 | void **this_prologue_cache) | |
790 | { | |
791 | struct trad_frame_cache *cache = | |
792 | mn10300_frame_unwind_cache (next_frame, this_prologue_cache); | |
793 | ||
794 | return trad_frame_get_this_base (cache); | |
795 | } | |
796 | ||
797 | static const struct frame_unwind * | |
798 | mn10300_frame_sniffer (struct frame_info *next_frame) | |
799 | { | |
800 | return &mn10300_frame_unwind; | |
801 | } | |
802 | ||
803 | static const struct frame_base mn10300_frame_base = { | |
804 | &mn10300_frame_unwind, | |
805 | mn10300_frame_base_address, | |
806 | mn10300_frame_base_address, | |
807 | mn10300_frame_base_address | |
808 | }; | |
809 | ||
810 | static CORE_ADDR | |
811 | mn10300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
812 | { | |
813 | ULONGEST pc; | |
814 | ||
815 | frame_unwind_unsigned_register (next_frame, E_PC_REGNUM, &pc); | |
816 | return pc; | |
817 | } | |
818 | ||
819 | static CORE_ADDR | |
820 | mn10300_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
821 | { | |
822 | ULONGEST sp; | |
823 | ||
824 | frame_unwind_unsigned_register (next_frame, E_SP_REGNUM, &sp); | |
825 | return sp; | |
826 | } | |
827 | ||
828 | static void | |
829 | mn10300_frame_unwind_init (struct gdbarch *gdbarch) | |
830 | { | |
831 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
832 | frame_unwind_append_sniffer (gdbarch, mn10300_frame_sniffer); | |
833 | frame_base_set_default (gdbarch, &mn10300_frame_base); | |
834 | set_gdbarch_unwind_dummy_id (gdbarch, mn10300_unwind_dummy_id); | |
835 | set_gdbarch_unwind_pc (gdbarch, mn10300_unwind_pc); | |
836 | set_gdbarch_unwind_sp (gdbarch, mn10300_unwind_sp); | |
837 | } | |
838 | ||
839 | /* Function: push_dummy_call | |
840 | * | |
841 | * Set up machine state for a target call, including | |
842 | * function arguments, stack, return address, etc. | |
843 | * | |
844 | */ | |
845 | ||
846 | static CORE_ADDR | |
847 | mn10300_push_dummy_call (struct gdbarch *gdbarch, | |
848 | struct value *target_func, | |
849 | struct regcache *regcache, | |
850 | CORE_ADDR bp_addr, | |
851 | int nargs, struct value **args, | |
852 | CORE_ADDR sp, | |
853 | int struct_return, | |
854 | CORE_ADDR struct_addr) | |
855 | { | |
856 | const int push_size = register_size (gdbarch, E_PC_REGNUM); | |
1fb1ca27 | 857 | int regs_used; |
342ee437 MS |
858 | int len, arg_len; |
859 | int stack_offset = 0; | |
860 | int argnum; | |
1fb1ca27 | 861 | char *val, valbuf[MAX_REGISTER_SIZE]; |
342ee437 | 862 | |
342ee437 MS |
863 | /* This should be a nop, but align the stack just in case something |
864 | went wrong. Stacks are four byte aligned on the mn10300. */ | |
865 | sp &= ~3; | |
866 | ||
867 | /* Now make space on the stack for the args. | |
868 | ||
869 | XXX This doesn't appear to handle pass-by-invisible reference | |
870 | arguments. */ | |
1fb1ca27 | 871 | regs_used = struct_return ? 1 : 0; |
342ee437 MS |
872 | for (len = 0, argnum = 0; argnum < nargs; argnum++) |
873 | { | |
874 | arg_len = (TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3; | |
342ee437 MS |
875 | while (regs_used < 2 && arg_len > 0) |
876 | { | |
877 | regs_used++; | |
878 | arg_len -= push_size; | |
879 | } | |
880 | len += arg_len; | |
881 | } | |
882 | ||
883 | /* Allocate stack space. */ | |
884 | sp -= len; | |
885 | ||
1fb1ca27 MS |
886 | if (struct_return) |
887 | { | |
888 | regs_used = 1; | |
889 | write_register (E_D0_REGNUM, struct_addr); | |
890 | } | |
891 | else | |
892 | regs_used = 0; | |
893 | ||
342ee437 MS |
894 | /* Push all arguments onto the stack. */ |
895 | for (argnum = 0; argnum < nargs; argnum++) | |
896 | { | |
1fb1ca27 MS |
897 | /* FIXME what about structs? Unions? */ |
898 | if (TYPE_CODE (value_type (*args)) == TYPE_CODE_STRUCT | |
899 | && TYPE_LENGTH (value_type (*args)) > 8) | |
900 | { | |
901 | /* Change to pointer-to-type. */ | |
902 | arg_len = push_size; | |
903 | store_unsigned_integer (valbuf, push_size, | |
904 | VALUE_ADDRESS (*args)); | |
905 | val = &valbuf[0]; | |
906 | } | |
907 | else | |
908 | { | |
909 | arg_len = TYPE_LENGTH (value_type (*args)); | |
910 | val = (char *) value_contents (*args); | |
911 | } | |
342ee437 MS |
912 | |
913 | while (regs_used < 2 && arg_len > 0) | |
914 | { | |
1fb1ca27 MS |
915 | write_register (regs_used, |
916 | extract_unsigned_integer (val, push_size)); | |
342ee437 MS |
917 | val += push_size; |
918 | arg_len -= push_size; | |
919 | regs_used++; | |
920 | } | |
921 | ||
922 | while (arg_len > 0) | |
923 | { | |
924 | write_memory (sp + stack_offset, val, push_size); | |
925 | arg_len -= push_size; | |
926 | val += push_size; | |
927 | stack_offset += push_size; | |
928 | } | |
929 | ||
930 | args++; | |
931 | } | |
932 | ||
933 | /* Make space for the flushback area. */ | |
934 | sp -= 8; | |
935 | ||
936 | /* Push the return address that contains the magic breakpoint. */ | |
937 | sp -= 4; | |
938 | write_memory_unsigned_integer (sp, push_size, bp_addr); | |
939 | /* Update $sp. */ | |
940 | regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp); | |
941 | return sp; | |
942 | } | |
943 | ||
944 | ||
945 | static struct gdbarch * | |
946 | mn10300_gdbarch_init (struct gdbarch_info info, | |
947 | struct gdbarch_list *arches) | |
948 | { | |
949 | struct gdbarch *gdbarch; | |
950 | struct gdbarch_tdep *tdep; | |
951 | ||
952 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
953 | if (arches != NULL) | |
954 | return arches->gdbarch; | |
955 | ||
956 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); | |
957 | gdbarch = gdbarch_alloc (&info, tdep); | |
958 | ||
959 | switch (info.bfd_arch_info->mach) | |
960 | { | |
961 | case 0: | |
962 | case bfd_mach_mn10300: | |
963 | set_gdbarch_register_name (gdbarch, mn10300_generic_register_name); | |
964 | tdep->am33_mode = 0; | |
965 | break; | |
966 | case bfd_mach_am33: | |
967 | set_gdbarch_register_name (gdbarch, am33_register_name); | |
968 | tdep->am33_mode = 1; | |
969 | break; | |
970 | default: | |
971 | internal_error (__FILE__, __LINE__, | |
972 | _("mn10300_gdbarch_init: Unknown mn10300 variant")); | |
973 | break; | |
974 | } | |
975 | ||
976 | /* Registers. */ | |
977 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); | |
978 | set_gdbarch_register_type (gdbarch, mn10300_register_type); | |
979 | set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue); | |
980 | set_gdbarch_read_pc (gdbarch, mn10300_read_pc); | |
981 | set_gdbarch_write_pc (gdbarch, mn10300_write_pc); | |
982 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); | |
983 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
984 | ||
985 | /* Stack unwinding. */ | |
986 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
987 | /* Breakpoints. */ | |
988 | set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc); | |
989 | /* decr_pc_after_break? */ | |
990 | /* Disassembly. */ | |
991 | set_gdbarch_print_insn (gdbarch, print_insn_mn10300); | |
992 | ||
993 | /* Stage 2 */ | |
994 | /* MVS Note: at least the first one is deprecated! */ | |
995 | set_gdbarch_deprecated_use_struct_convention (gdbarch, | |
996 | mn10300_use_struct_convention); | |
997 | set_gdbarch_store_return_value (gdbarch, mn10300_store_return_value); | |
998 | set_gdbarch_extract_return_value (gdbarch, mn10300_extract_return_value); | |
999 | ||
1000 | /* Stage 3 -- get target calls working. */ | |
1001 | set_gdbarch_push_dummy_call (gdbarch, mn10300_push_dummy_call); | |
1002 | /* set_gdbarch_return_value (store, extract) */ | |
1003 | ||
1004 | ||
1005 | mn10300_frame_unwind_init (gdbarch); | |
1006 | ||
697e3bc9 KB |
1007 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1008 | gdbarch_init_osabi (info, gdbarch); | |
1009 | ||
342ee437 MS |
1010 | return gdbarch; |
1011 | } | |
1012 | ||
1013 | /* Dump out the mn10300 specific architecture information. */ | |
1014 | ||
1015 | static void | |
1016 | mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1017 | { | |
1018 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
1019 | fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n", | |
1020 | tdep->am33_mode); | |
1021 | } | |
1022 | ||
1023 | void | |
1024 | _initialize_mn10300_tdep (void) | |
1025 | { | |
1026 | gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep); | |
1027 | } | |
1028 |