Commit | Line | Data |
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c906108c | 1 | /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. |
8e65ff28 AC |
2 | Copyright 1996, 1997, 1998, 2000, 2001 |
3 | Free Software Foundation, Inc. | |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | #include "obstack.h" | |
26 | #include "target.h" | |
27 | #include "value.h" | |
28 | #include "bfd.h" | |
29 | #include "gdb_string.h" | |
30 | #include "gdbcore.h" | |
31 | #include "symfile.h" | |
32 | ||
c2c6d25f | 33 | extern void _initialize_mn10300_tdep (void); |
a14ed312 KB |
34 | static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi, |
35 | CORE_ADDR pc); | |
c906108c | 36 | |
91225883 AC |
37 | /* mn10300 private data */ |
38 | struct gdbarch_tdep | |
39 | { | |
40 | int am33_mode; | |
41 | #define AM33_MODE (gdbarch_tdep (current_gdbarch)->am33_mode) | |
42 | }; | |
43 | ||
c906108c SS |
44 | /* Additional info used by the frame */ |
45 | ||
46 | struct frame_extra_info | |
c5aa993b JM |
47 | { |
48 | int status; | |
49 | int stack_size; | |
50 | }; | |
c906108c | 51 | |
0f71a2f6 | 52 | |
91225883 AC |
53 | static char * |
54 | register_name (int reg, char **regs, long sizeof_regs) | |
c2d11a7d | 55 | { |
91225883 AC |
56 | if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0])) |
57 | return NULL; | |
58 | else | |
59 | return regs[reg]; | |
60 | } | |
61 | ||
62 | static char * | |
63 | mn10300_generic_register_name (int reg) | |
0f71a2f6 | 64 | { |
91225883 AC |
65 | static char *regs[] = |
66 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
67 | "sp", "pc", "mdr", "psw", "lir", "lar", "", "", | |
68 | "", "", "", "", "", "", "", "", | |
69 | "", "", "", "", "", "", "", "fp" | |
70 | }; | |
71 | return register_name (reg, regs, sizeof regs); | |
0f71a2f6 JM |
72 | } |
73 | ||
91225883 AC |
74 | |
75 | static char * | |
76 | am33_register_name (int reg) | |
77 | { | |
78 | static char *regs[] = | |
79 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
80 | "sp", "pc", "mdr", "psw", "lir", "lar", "", | |
81 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
82 | "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", "" | |
83 | }; | |
84 | return register_name (reg, regs, sizeof regs); | |
85 | } | |
86 | ||
0f71a2f6 | 87 | CORE_ADDR |
fba45db2 | 88 | mn10300_saved_pc_after_call (struct frame_info *fi) |
0f71a2f6 JM |
89 | { |
90 | return read_memory_integer (read_register (SP_REGNUM), 4); | |
91 | } | |
92 | ||
93 | void | |
fba45db2 | 94 | mn10300_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
0f71a2f6 JM |
95 | { |
96 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
97 | memcpy (valbuf, regbuf + REGISTER_BYTE (4), TYPE_LENGTH (type)); | |
98 | else | |
99 | memcpy (valbuf, regbuf + REGISTER_BYTE (0), TYPE_LENGTH (type)); | |
100 | } | |
101 | ||
102 | CORE_ADDR | |
fba45db2 | 103 | mn10300_extract_struct_value_address (char *regbuf) |
0f71a2f6 JM |
104 | { |
105 | return extract_address (regbuf + REGISTER_BYTE (4), | |
106 | REGISTER_RAW_SIZE (4)); | |
107 | } | |
108 | ||
109 | void | |
fba45db2 | 110 | mn10300_store_return_value (struct type *type, char *valbuf) |
0f71a2f6 JM |
111 | { |
112 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
113 | write_register_bytes (REGISTER_BYTE (4), valbuf, TYPE_LENGTH (type)); | |
114 | else | |
115 | write_register_bytes (REGISTER_BYTE (0), valbuf, TYPE_LENGTH (type)); | |
116 | } | |
117 | ||
a14ed312 | 118 | static struct frame_info *analyze_dummy_frame (CORE_ADDR, CORE_ADDR); |
c906108c | 119 | static struct frame_info * |
fba45db2 | 120 | analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame) |
c906108c SS |
121 | { |
122 | static struct frame_info *dummy = NULL; | |
123 | if (dummy == NULL) | |
124 | { | |
125 | dummy = xmalloc (sizeof (struct frame_info)); | |
126 | dummy->saved_regs = xmalloc (SIZEOF_FRAME_SAVED_REGS); | |
127 | dummy->extra_info = xmalloc (sizeof (struct frame_extra_info)); | |
128 | } | |
129 | dummy->next = NULL; | |
130 | dummy->prev = NULL; | |
131 | dummy->pc = pc; | |
132 | dummy->frame = frame; | |
133 | dummy->extra_info->status = 0; | |
134 | dummy->extra_info->stack_size = 0; | |
135 | memset (dummy->saved_regs, '\000', SIZEOF_FRAME_SAVED_REGS); | |
136 | mn10300_analyze_prologue (dummy, 0); | |
137 | return dummy; | |
138 | } | |
139 | ||
140 | /* Values for frame_info.status */ | |
141 | ||
142 | #define MY_FRAME_IN_SP 0x1 | |
143 | #define MY_FRAME_IN_FP 0x2 | |
144 | #define NO_MORE_FRAMES 0x4 | |
145 | ||
146 | ||
147 | /* Should call_function allocate stack space for a struct return? */ | |
148 | int | |
fba45db2 | 149 | mn10300_use_struct_convention (int gcc_p, struct type *type) |
c906108c SS |
150 | { |
151 | return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8); | |
152 | } | |
153 | ||
154 | /* The breakpoint instruction must be the same size as the smallest | |
155 | instruction in the instruction set. | |
156 | ||
157 | The Matsushita mn10x00 processors have single byte instructions | |
158 | so we need a single byte breakpoint. Matsushita hasn't defined | |
159 | one, so we defined it ourselves. */ | |
160 | ||
161 | unsigned char * | |
fba45db2 | 162 | mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size) |
c906108c | 163 | { |
c5aa993b JM |
164 | static char breakpoint[] = |
165 | {0xff}; | |
c906108c SS |
166 | *bp_size = 1; |
167 | return breakpoint; | |
168 | } | |
169 | ||
170 | ||
171 | /* Fix fi->frame if it's bogus at this point. This is a helper | |
172 | function for mn10300_analyze_prologue. */ | |
173 | ||
174 | static void | |
fba45db2 | 175 | fix_frame_pointer (struct frame_info *fi, int stack_size) |
c906108c SS |
176 | { |
177 | if (fi && fi->next == NULL) | |
178 | { | |
179 | if (fi->extra_info->status & MY_FRAME_IN_SP) | |
180 | fi->frame = read_sp () - stack_size; | |
181 | else if (fi->extra_info->status & MY_FRAME_IN_FP) | |
182 | fi->frame = read_register (A3_REGNUM); | |
183 | } | |
184 | } | |
185 | ||
186 | ||
187 | /* Set offsets of registers saved by movm instruction. | |
188 | This is a helper function for mn10300_analyze_prologue. */ | |
189 | ||
190 | static void | |
fba45db2 | 191 | set_movm_offsets (struct frame_info *fi, int movm_args) |
c906108c SS |
192 | { |
193 | int offset = 0; | |
194 | ||
195 | if (fi == NULL || movm_args == 0) | |
196 | return; | |
197 | ||
198 | if (movm_args & 0x10) | |
199 | { | |
200 | fi->saved_regs[A3_REGNUM] = fi->frame + offset; | |
201 | offset += 4; | |
202 | } | |
203 | if (movm_args & 0x20) | |
204 | { | |
205 | fi->saved_regs[A2_REGNUM] = fi->frame + offset; | |
206 | offset += 4; | |
207 | } | |
208 | if (movm_args & 0x40) | |
209 | { | |
210 | fi->saved_regs[D3_REGNUM] = fi->frame + offset; | |
211 | offset += 4; | |
212 | } | |
213 | if (movm_args & 0x80) | |
214 | { | |
215 | fi->saved_regs[D2_REGNUM] = fi->frame + offset; | |
216 | offset += 4; | |
217 | } | |
91225883 | 218 | if (AM33_MODE && movm_args & 0x02) |
c2d11a7d JM |
219 | { |
220 | fi->saved_regs[E0_REGNUM + 5] = fi->frame + offset; | |
221 | fi->saved_regs[E0_REGNUM + 4] = fi->frame + offset + 4; | |
222 | fi->saved_regs[E0_REGNUM + 3] = fi->frame + offset + 8; | |
223 | fi->saved_regs[E0_REGNUM + 2] = fi->frame + offset + 12; | |
224 | } | |
c906108c SS |
225 | } |
226 | ||
227 | ||
228 | /* The main purpose of this file is dealing with prologues to extract | |
229 | information about stack frames and saved registers. | |
230 | ||
231 | For reference here's how prologues look on the mn10300: | |
232 | ||
c5aa993b JM |
233 | With frame pointer: |
234 | movm [d2,d3,a2,a3],sp | |
235 | mov sp,a3 | |
236 | add <size>,sp | |
c906108c | 237 | |
c5aa993b JM |
238 | Without frame pointer: |
239 | movm [d2,d3,a2,a3],sp (if needed) | |
240 | add <size>,sp | |
c906108c SS |
241 | |
242 | One day we might keep the stack pointer constant, that won't | |
243 | change the code for prologues, but it will make the frame | |
244 | pointerless case much more common. */ | |
c5aa993b | 245 | |
c906108c SS |
246 | /* Analyze the prologue to determine where registers are saved, |
247 | the end of the prologue, etc etc. Return the end of the prologue | |
248 | scanned. | |
249 | ||
250 | We store into FI (if non-null) several tidbits of information: | |
251 | ||
c5aa993b JM |
252 | * stack_size -- size of this stack frame. Note that if we stop in |
253 | certain parts of the prologue/epilogue we may claim the size of the | |
254 | current frame is zero. This happens when the current frame has | |
255 | not been allocated yet or has already been deallocated. | |
c906108c | 256 | |
c5aa993b | 257 | * fsr -- Addresses of registers saved in the stack by this frame. |
c906108c | 258 | |
c5aa993b JM |
259 | * status -- A (relatively) generic status indicator. It's a bitmask |
260 | with the following bits: | |
c906108c | 261 | |
c5aa993b JM |
262 | MY_FRAME_IN_SP: The base of the current frame is actually in |
263 | the stack pointer. This can happen for frame pointerless | |
264 | functions, or cases where we're stopped in the prologue/epilogue | |
265 | itself. For these cases mn10300_analyze_prologue will need up | |
266 | update fi->frame before returning or analyzing the register | |
267 | save instructions. | |
c906108c | 268 | |
c5aa993b JM |
269 | MY_FRAME_IN_FP: The base of the current frame is in the |
270 | frame pointer register ($a2). | |
c906108c | 271 | |
c5aa993b JM |
272 | NO_MORE_FRAMES: Set this if the current frame is "start" or |
273 | if the first instruction looks like mov <imm>,sp. This tells | |
274 | frame chain to not bother trying to unwind past this frame. */ | |
c906108c SS |
275 | |
276 | static CORE_ADDR | |
fba45db2 | 277 | mn10300_analyze_prologue (struct frame_info *fi, CORE_ADDR pc) |
c906108c SS |
278 | { |
279 | CORE_ADDR func_addr, func_end, addr, stop; | |
280 | CORE_ADDR stack_size; | |
281 | int imm_size; | |
282 | unsigned char buf[4]; | |
283 | int status, movm_args = 0; | |
284 | char *name; | |
285 | ||
286 | /* Use the PC in the frame if it's provided to look up the | |
287 | start of this function. */ | |
288 | pc = (fi ? fi->pc : pc); | |
289 | ||
290 | /* Find the start of this function. */ | |
291 | status = find_pc_partial_function (pc, &name, &func_addr, &func_end); | |
292 | ||
293 | /* Do nothing if we couldn't find the start of this function or if we're | |
294 | stopped at the first instruction in the prologue. */ | |
295 | if (status == 0) | |
43ff13b4 JM |
296 | { |
297 | return pc; | |
298 | } | |
c906108c SS |
299 | |
300 | /* If we're in start, then give up. */ | |
301 | if (strcmp (name, "start") == 0) | |
302 | { | |
303 | if (fi != NULL) | |
304 | fi->extra_info->status = NO_MORE_FRAMES; | |
305 | return pc; | |
306 | } | |
307 | ||
308 | /* At the start of a function our frame is in the stack pointer. */ | |
309 | if (fi) | |
310 | fi->extra_info->status = MY_FRAME_IN_SP; | |
311 | ||
312 | /* Get the next two bytes into buf, we need two because rets is a two | |
313 | byte insn and the first isn't enough to uniquely identify it. */ | |
314 | status = read_memory_nobpt (pc, buf, 2); | |
315 | if (status != 0) | |
316 | return pc; | |
317 | ||
318 | /* If we're physically on an "rets" instruction, then our frame has | |
319 | already been deallocated. Note this can also be true for retf | |
320 | and ret if they specify a size of zero. | |
321 | ||
322 | In this case fi->frame is bogus, we need to fix it. */ | |
323 | if (fi && buf[0] == 0xf0 && buf[1] == 0xfc) | |
324 | { | |
325 | if (fi->next == NULL) | |
326 | fi->frame = read_sp (); | |
327 | return fi->pc; | |
328 | } | |
329 | ||
330 | /* Similarly if we're stopped on the first insn of a prologue as our | |
331 | frame hasn't been allocated yet. */ | |
332 | if (fi && fi->pc == func_addr) | |
333 | { | |
334 | if (fi->next == NULL) | |
335 | fi->frame = read_sp (); | |
336 | return fi->pc; | |
337 | } | |
338 | ||
339 | /* Figure out where to stop scanning. */ | |
340 | stop = fi ? fi->pc : func_end; | |
341 | ||
342 | /* Don't walk off the end of the function. */ | |
343 | stop = stop > func_end ? func_end : stop; | |
344 | ||
345 | /* Start scanning on the first instruction of this function. */ | |
346 | addr = func_addr; | |
347 | ||
348 | /* Suck in two bytes. */ | |
349 | status = read_memory_nobpt (addr, buf, 2); | |
350 | if (status != 0) | |
351 | { | |
352 | fix_frame_pointer (fi, 0); | |
353 | return addr; | |
354 | } | |
355 | ||
356 | /* First see if this insn sets the stack pointer; if so, it's something | |
357 | we won't understand, so quit now. */ | |
358 | if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0) | |
359 | { | |
360 | if (fi) | |
361 | fi->extra_info->status = NO_MORE_FRAMES; | |
362 | return addr; | |
363 | } | |
364 | ||
365 | /* Now look for movm [regs],sp, which saves the callee saved registers. | |
366 | ||
367 | At this time we don't know if fi->frame is valid, so we only note | |
368 | that we encountered a movm instruction. Later, we'll set the entries | |
369 | in fsr.regs as needed. */ | |
370 | if (buf[0] == 0xcf) | |
371 | { | |
372 | /* Extract the register list for the movm instruction. */ | |
373 | status = read_memory_nobpt (addr + 1, buf, 1); | |
374 | movm_args = *buf; | |
375 | ||
376 | addr += 2; | |
377 | ||
378 | /* Quit now if we're beyond the stop point. */ | |
379 | if (addr >= stop) | |
380 | { | |
381 | /* Fix fi->frame since it's bogus at this point. */ | |
382 | if (fi && fi->next == NULL) | |
383 | fi->frame = read_sp (); | |
384 | ||
385 | /* Note if/where callee saved registers were saved. */ | |
386 | set_movm_offsets (fi, movm_args); | |
387 | return addr; | |
388 | } | |
389 | ||
390 | /* Get the next two bytes so the prologue scan can continue. */ | |
391 | status = read_memory_nobpt (addr, buf, 2); | |
392 | if (status != 0) | |
393 | { | |
394 | /* Fix fi->frame since it's bogus at this point. */ | |
395 | if (fi && fi->next == NULL) | |
396 | fi->frame = read_sp (); | |
397 | ||
398 | /* Note if/where callee saved registers were saved. */ | |
399 | set_movm_offsets (fi, movm_args); | |
400 | return addr; | |
401 | } | |
402 | } | |
403 | ||
404 | /* Now see if we set up a frame pointer via "mov sp,a3" */ | |
405 | if (buf[0] == 0x3f) | |
406 | { | |
407 | addr += 1; | |
408 | ||
409 | /* The frame pointer is now valid. */ | |
410 | if (fi) | |
411 | { | |
412 | fi->extra_info->status |= MY_FRAME_IN_FP; | |
413 | fi->extra_info->status &= ~MY_FRAME_IN_SP; | |
414 | } | |
415 | ||
416 | /* Quit now if we're beyond the stop point. */ | |
417 | if (addr >= stop) | |
418 | { | |
419 | /* Fix fi->frame if it's bogus at this point. */ | |
420 | fix_frame_pointer (fi, 0); | |
421 | ||
422 | /* Note if/where callee saved registers were saved. */ | |
423 | set_movm_offsets (fi, movm_args); | |
424 | return addr; | |
425 | } | |
426 | ||
427 | /* Get two more bytes so scanning can continue. */ | |
428 | status = read_memory_nobpt (addr, buf, 2); | |
429 | if (status != 0) | |
430 | { | |
431 | /* Fix fi->frame if it's bogus at this point. */ | |
432 | fix_frame_pointer (fi, 0); | |
433 | ||
434 | /* Note if/where callee saved registers were saved. */ | |
435 | set_movm_offsets (fi, movm_args); | |
436 | return addr; | |
437 | } | |
438 | } | |
c5aa993b | 439 | |
c906108c SS |
440 | /* Next we should allocate the local frame. No more prologue insns |
441 | are found after allocating the local frame. | |
c5aa993b | 442 | |
c906108c | 443 | Search for add imm8,sp (0xf8feXX) |
c5aa993b JM |
444 | or add imm16,sp (0xfafeXXXX) |
445 | or add imm32,sp (0xfcfeXXXXXXXX). | |
446 | ||
c906108c SS |
447 | If none of the above was found, then this prologue has no |
448 | additional stack. */ | |
449 | ||
450 | status = read_memory_nobpt (addr, buf, 2); | |
451 | if (status != 0) | |
452 | { | |
453 | /* Fix fi->frame if it's bogus at this point. */ | |
454 | fix_frame_pointer (fi, 0); | |
455 | ||
456 | /* Note if/where callee saved registers were saved. */ | |
457 | set_movm_offsets (fi, movm_args); | |
458 | return addr; | |
459 | } | |
460 | ||
461 | imm_size = 0; | |
462 | if (buf[0] == 0xf8 && buf[1] == 0xfe) | |
463 | imm_size = 1; | |
464 | else if (buf[0] == 0xfa && buf[1] == 0xfe) | |
465 | imm_size = 2; | |
466 | else if (buf[0] == 0xfc && buf[1] == 0xfe) | |
467 | imm_size = 4; | |
468 | ||
469 | if (imm_size != 0) | |
470 | { | |
471 | /* Suck in imm_size more bytes, they'll hold the size of the | |
472 | current frame. */ | |
473 | status = read_memory_nobpt (addr + 2, buf, imm_size); | |
474 | if (status != 0) | |
475 | { | |
476 | /* Fix fi->frame if it's bogus at this point. */ | |
477 | fix_frame_pointer (fi, 0); | |
478 | ||
479 | /* Note if/where callee saved registers were saved. */ | |
480 | set_movm_offsets (fi, movm_args); | |
481 | return addr; | |
482 | } | |
483 | ||
484 | /* Note the size of the stack in the frame info structure. */ | |
485 | stack_size = extract_signed_integer (buf, imm_size); | |
486 | if (fi) | |
487 | fi->extra_info->stack_size = stack_size; | |
488 | ||
489 | /* We just consumed 2 + imm_size bytes. */ | |
490 | addr += 2 + imm_size; | |
491 | ||
492 | /* No more prologue insns follow, so begin preparation to return. */ | |
493 | /* Fix fi->frame if it's bogus at this point. */ | |
494 | fix_frame_pointer (fi, stack_size); | |
495 | ||
496 | /* Note if/where callee saved registers were saved. */ | |
497 | set_movm_offsets (fi, movm_args); | |
498 | return addr; | |
499 | } | |
500 | ||
501 | /* We never found an insn which allocates local stack space, regardless | |
502 | this is the end of the prologue. */ | |
503 | /* Fix fi->frame if it's bogus at this point. */ | |
504 | fix_frame_pointer (fi, 0); | |
505 | ||
506 | /* Note if/where callee saved registers were saved. */ | |
507 | set_movm_offsets (fi, movm_args); | |
508 | return addr; | |
509 | } | |
c5aa993b | 510 | |
c906108c SS |
511 | /* Function: frame_chain |
512 | Figure out and return the caller's frame pointer given current | |
513 | frame_info struct. | |
514 | ||
515 | We don't handle dummy frames yet but we would probably just return the | |
516 | stack pointer that was in use at the time the function call was made? */ | |
517 | ||
518 | CORE_ADDR | |
fba45db2 | 519 | mn10300_frame_chain (struct frame_info *fi) |
c906108c SS |
520 | { |
521 | struct frame_info *dummy; | |
522 | /* Walk through the prologue to determine the stack size, | |
523 | location of saved registers, end of the prologue, etc. */ | |
524 | if (fi->extra_info->status == 0) | |
c5aa993b | 525 | mn10300_analyze_prologue (fi, (CORE_ADDR) 0); |
c906108c SS |
526 | |
527 | /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */ | |
528 | if (fi->extra_info->status & NO_MORE_FRAMES) | |
529 | return 0; | |
530 | ||
531 | /* Now that we've analyzed our prologue, determine the frame | |
532 | pointer for our caller. | |
533 | ||
c5aa993b JM |
534 | If our caller has a frame pointer, then we need to |
535 | find the entry value of $a3 to our function. | |
536 | ||
537 | If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory | |
538 | location pointed to by fsr.regs[A3_REGNUM]. | |
c906108c | 539 | |
c5aa993b | 540 | Else it's still in $a3. |
c906108c | 541 | |
c5aa993b JM |
542 | If our caller does not have a frame pointer, then his |
543 | frame base is fi->frame + -caller's stack size. */ | |
c906108c | 544 | |
c906108c SS |
545 | /* The easiest way to get that info is to analyze our caller's frame. |
546 | So we set up a dummy frame and call mn10300_analyze_prologue to | |
547 | find stuff for us. */ | |
548 | dummy = analyze_dummy_frame (FRAME_SAVED_PC (fi), fi->frame); | |
549 | ||
550 | if (dummy->extra_info->status & MY_FRAME_IN_FP) | |
551 | { | |
552 | /* Our caller has a frame pointer. So find the frame in $a3 or | |
553 | in the stack. */ | |
554 | if (fi->saved_regs[A3_REGNUM]) | |
555 | return (read_memory_integer (fi->saved_regs[A3_REGNUM], REGISTER_SIZE)); | |
556 | else | |
557 | return read_register (A3_REGNUM); | |
558 | } | |
559 | else | |
560 | { | |
561 | int adjust = 0; | |
562 | ||
563 | adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0); | |
564 | adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0); | |
565 | adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0); | |
566 | adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0); | |
91225883 | 567 | if (AM33_MODE) |
c2d11a7d JM |
568 | { |
569 | adjust += (fi->saved_regs[E0_REGNUM + 5] ? 4 : 0); | |
570 | adjust += (fi->saved_regs[E0_REGNUM + 4] ? 4 : 0); | |
571 | adjust += (fi->saved_regs[E0_REGNUM + 3] ? 4 : 0); | |
572 | adjust += (fi->saved_regs[E0_REGNUM + 2] ? 4 : 0); | |
573 | } | |
c906108c SS |
574 | |
575 | /* Our caller does not have a frame pointer. So his frame starts | |
c5aa993b JM |
576 | at the base of our frame (fi->frame) + register save space |
577 | + <his size>. */ | |
c906108c SS |
578 | return fi->frame + adjust + -dummy->extra_info->stack_size; |
579 | } | |
580 | } | |
581 | ||
582 | /* Function: skip_prologue | |
583 | Return the address of the first inst past the prologue of the function. */ | |
584 | ||
585 | CORE_ADDR | |
fba45db2 | 586 | mn10300_skip_prologue (CORE_ADDR pc) |
c906108c SS |
587 | { |
588 | /* We used to check the debug symbols, but that can lose if | |
589 | we have a null prologue. */ | |
590 | return mn10300_analyze_prologue (NULL, pc); | |
591 | } | |
592 | ||
593 | ||
594 | /* Function: pop_frame | |
595 | This routine gets called when either the user uses the `return' | |
596 | command, or the call dummy breakpoint gets hit. */ | |
597 | ||
598 | void | |
fba45db2 | 599 | mn10300_pop_frame (struct frame_info *frame) |
c906108c SS |
600 | { |
601 | int regnum; | |
602 | ||
c5aa993b | 603 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
c906108c SS |
604 | generic_pop_dummy_frame (); |
605 | else | |
606 | { | |
607 | write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); | |
608 | ||
609 | /* Restore any saved registers. */ | |
610 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
611 | if (frame->saved_regs[regnum] != 0) | |
612 | { | |
613 | ULONGEST value; | |
614 | ||
615 | value = read_memory_unsigned_integer (frame->saved_regs[regnum], | |
c5aa993b | 616 | REGISTER_RAW_SIZE (regnum)); |
c906108c SS |
617 | write_register (regnum, value); |
618 | } | |
619 | ||
620 | /* Actually cut back the stack. */ | |
621 | write_register (SP_REGNUM, FRAME_FP (frame)); | |
622 | ||
623 | /* Don't we need to set the PC?!? XXX FIXME. */ | |
624 | } | |
625 | ||
626 | /* Throw away any cached frame information. */ | |
627 | flush_cached_frames (); | |
628 | } | |
629 | ||
630 | /* Function: push_arguments | |
631 | Setup arguments for a call to the target. Arguments go in | |
632 | order on the stack. */ | |
633 | ||
634 | CORE_ADDR | |
91225883 AC |
635 | mn10300_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
636 | int struct_return, CORE_ADDR struct_addr) | |
c906108c SS |
637 | { |
638 | int argnum = 0; | |
639 | int len = 0; | |
640 | int stack_offset = 0; | |
641 | int regsused = struct_return ? 1 : 0; | |
642 | ||
643 | /* This should be a nop, but align the stack just in case something | |
644 | went wrong. Stacks are four byte aligned on the mn10300. */ | |
645 | sp &= ~3; | |
646 | ||
647 | /* Now make space on the stack for the args. | |
648 | ||
649 | XXX This doesn't appear to handle pass-by-invisible reference | |
650 | arguments. */ | |
651 | for (argnum = 0; argnum < nargs; argnum++) | |
652 | { | |
653 | int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3; | |
654 | ||
655 | while (regsused < 2 && arg_length > 0) | |
656 | { | |
657 | regsused++; | |
658 | arg_length -= 4; | |
659 | } | |
660 | len += arg_length; | |
661 | } | |
662 | ||
663 | /* Allocate stack space. */ | |
664 | sp -= len; | |
665 | ||
666 | regsused = struct_return ? 1 : 0; | |
667 | /* Push all arguments onto the stack. */ | |
668 | for (argnum = 0; argnum < nargs; argnum++) | |
669 | { | |
670 | int len; | |
671 | char *val; | |
672 | ||
673 | /* XXX Check this. What about UNIONS? */ | |
674 | if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT | |
675 | && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) | |
676 | { | |
677 | /* XXX Wrong, we want a pointer to this argument. */ | |
c5aa993b JM |
678 | len = TYPE_LENGTH (VALUE_TYPE (*args)); |
679 | val = (char *) VALUE_CONTENTS (*args); | |
c906108c SS |
680 | } |
681 | else | |
682 | { | |
683 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
c5aa993b | 684 | val = (char *) VALUE_CONTENTS (*args); |
c906108c SS |
685 | } |
686 | ||
687 | while (regsused < 2 && len > 0) | |
688 | { | |
689 | write_register (regsused, extract_unsigned_integer (val, 4)); | |
690 | val += 4; | |
691 | len -= 4; | |
692 | regsused++; | |
693 | } | |
694 | ||
695 | while (len > 0) | |
696 | { | |
697 | write_memory (sp + stack_offset, val, 4); | |
698 | len -= 4; | |
699 | val += 4; | |
700 | stack_offset += 4; | |
701 | } | |
702 | ||
703 | args++; | |
704 | } | |
705 | ||
706 | /* Make space for the flushback area. */ | |
707 | sp -= 8; | |
708 | return sp; | |
709 | } | |
710 | ||
711 | /* Function: push_return_address (pc) | |
712 | Set up the return address for the inferior function call. | |
713 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
c5aa993b | 714 | |
c906108c | 715 | CORE_ADDR |
fba45db2 | 716 | mn10300_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
c906108c SS |
717 | { |
718 | unsigned char buf[4]; | |
719 | ||
720 | store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ()); | |
721 | write_memory (sp - 4, buf, 4); | |
722 | return sp - 4; | |
723 | } | |
724 | ||
725 | /* Function: store_struct_return (addr,sp) | |
726 | Store the structure value return address for an inferior function | |
727 | call. */ | |
c5aa993b | 728 | |
c906108c | 729 | CORE_ADDR |
fba45db2 | 730 | mn10300_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
c906108c SS |
731 | { |
732 | /* The structure return address is passed as the first argument. */ | |
733 | write_register (0, addr); | |
734 | return sp; | |
735 | } | |
c5aa993b | 736 | |
c906108c SS |
737 | /* Function: frame_saved_pc |
738 | Find the caller of this frame. We do this by seeing if RP_REGNUM | |
739 | is saved in the stack anywhere, otherwise we get it from the | |
740 | registers. If the inner frame is a dummy frame, return its PC | |
741 | instead of RP, because that's where "caller" of the dummy-frame | |
742 | will be found. */ | |
743 | ||
744 | CORE_ADDR | |
fba45db2 | 745 | mn10300_frame_saved_pc (struct frame_info *fi) |
c906108c SS |
746 | { |
747 | int adjust = 0; | |
748 | ||
749 | adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0); | |
750 | adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0); | |
751 | adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0); | |
752 | adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0); | |
91225883 | 753 | if (AM33_MODE) |
c2d11a7d JM |
754 | { |
755 | adjust += (fi->saved_regs[E0_REGNUM + 5] ? 4 : 0); | |
756 | adjust += (fi->saved_regs[E0_REGNUM + 4] ? 4 : 0); | |
757 | adjust += (fi->saved_regs[E0_REGNUM + 3] ? 4 : 0); | |
758 | adjust += (fi->saved_regs[E0_REGNUM + 2] ? 4 : 0); | |
759 | } | |
c906108c SS |
760 | |
761 | return (read_memory_integer (fi->frame + adjust, REGISTER_SIZE)); | |
762 | } | |
763 | ||
c906108c SS |
764 | /* Function: mn10300_init_extra_frame_info |
765 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
766 | registers. Most of the work is done in mn10300_analyze_prologue(). | |
767 | ||
768 | Note that when we are called for the last frame (currently active frame), | |
769 | that fi->pc and fi->frame will already be setup. However, fi->frame will | |
770 | be valid only if this routine uses FP. For previous frames, fi-frame will | |
771 | always be correct. mn10300_analyze_prologue will fix fi->frame if | |
772 | it's not valid. | |
773 | ||
774 | We can be called with the PC in the call dummy under two circumstances. | |
775 | First, during normal backtracing, second, while figuring out the frame | |
776 | pointer just prior to calling the target function (see run_stack_dummy). */ | |
777 | ||
778 | void | |
fba45db2 | 779 | mn10300_init_extra_frame_info (struct frame_info *fi) |
c906108c SS |
780 | { |
781 | if (fi->next) | |
782 | fi->pc = FRAME_SAVED_PC (fi->next); | |
783 | ||
784 | frame_saved_regs_zalloc (fi); | |
785 | fi->extra_info = (struct frame_extra_info *) | |
786 | frame_obstack_alloc (sizeof (struct frame_extra_info)); | |
787 | ||
788 | fi->extra_info->status = 0; | |
789 | fi->extra_info->stack_size = 0; | |
790 | ||
791 | mn10300_analyze_prologue (fi, 0); | |
792 | } | |
793 | ||
794 | /* Function: mn10300_virtual_frame_pointer | |
795 | Return the register that the function uses for a frame pointer, | |
796 | plus any necessary offset to be applied to the register before | |
797 | any frame pointer offsets. */ | |
798 | ||
799 | void | |
fba45db2 | 800 | mn10300_virtual_frame_pointer (CORE_ADDR pc, long *reg, long *offset) |
c906108c SS |
801 | { |
802 | struct frame_info *dummy = analyze_dummy_frame (pc, 0); | |
803 | /* Set up a dummy frame_info, Analyze the prolog and fill in the | |
804 | extra info. */ | |
805 | /* Results will tell us which type of frame it uses. */ | |
806 | if (dummy->extra_info->status & MY_FRAME_IN_SP) | |
807 | { | |
c5aa993b | 808 | *reg = SP_REGNUM; |
c906108c SS |
809 | *offset = -(dummy->extra_info->stack_size); |
810 | } | |
811 | else | |
812 | { | |
c5aa993b | 813 | *reg = A3_REGNUM; |
c906108c SS |
814 | *offset = 0; |
815 | } | |
816 | } | |
c5aa993b | 817 | |
91225883 AC |
818 | static int |
819 | mn10300_reg_struct_has_addr (int gcc_p, struct type *type) | |
c906108c | 820 | { |
91225883 AC |
821 | return (TYPE_LENGTH (type) > 8); |
822 | } | |
c906108c | 823 | |
f6df245f AC |
824 | static struct type * |
825 | mn10300_register_virtual_type (int reg) | |
826 | { | |
827 | return builtin_type_int; | |
828 | } | |
829 | ||
830 | static int | |
831 | mn10300_register_byte (int reg) | |
832 | { | |
833 | return (reg * 4); | |
834 | } | |
835 | ||
836 | static int | |
837 | mn10300_register_virtual_size (int reg) | |
838 | { | |
839 | return 4; | |
840 | } | |
841 | ||
842 | static int | |
843 | mn10300_register_raw_size (int reg) | |
844 | { | |
845 | return 4; | |
846 | } | |
847 | ||
848 | static void | |
849 | mn10300_print_register (const char *name, int regnum, int reg_width) | |
850 | { | |
851 | char *raw_buffer = alloca (MAX_REGISTER_RAW_SIZE); | |
852 | ||
853 | if (reg_width) | |
854 | printf_filtered ("%*s: ", reg_width, name); | |
855 | else | |
856 | printf_filtered ("%s: ", name); | |
857 | ||
858 | /* Get the data */ | |
859 | if (read_relative_register_raw_bytes (regnum, raw_buffer)) | |
860 | { | |
861 | printf_filtered ("[invalid]"); | |
862 | return; | |
863 | } | |
864 | else | |
865 | { | |
866 | int byte; | |
867 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
868 | { | |
869 | for (byte = REGISTER_RAW_SIZE (regnum) - REGISTER_VIRTUAL_SIZE (regnum); | |
870 | byte < REGISTER_RAW_SIZE (regnum); | |
871 | byte++) | |
872 | printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); | |
873 | } | |
874 | else | |
875 | { | |
876 | for (byte = REGISTER_VIRTUAL_SIZE (regnum) - 1; | |
877 | byte >= 0; | |
878 | byte--) | |
879 | printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); | |
880 | } | |
881 | } | |
882 | } | |
883 | ||
884 | static void | |
885 | mn10300_do_registers_info (int regnum, int fpregs) | |
886 | { | |
887 | if (regnum >= 0) | |
888 | { | |
889 | const char *name = REGISTER_NAME (regnum); | |
890 | if (name == NULL || name[0] == '\0') | |
891 | error ("Not a valid register for the current processor type"); | |
892 | mn10300_print_register (name, regnum, 0); | |
893 | printf_filtered ("\n"); | |
894 | } | |
895 | else | |
896 | { | |
897 | /* print registers in an array 4x8 */ | |
898 | int r; | |
899 | int reg; | |
900 | const int nr_in_row = 4; | |
901 | const int reg_width = 4; | |
902 | for (r = 0; r < NUM_REGS; r += nr_in_row) | |
903 | { | |
904 | int c; | |
905 | int printing = 0; | |
906 | int padding = 0; | |
907 | for (c = r; c < r + nr_in_row; c++) | |
908 | { | |
909 | const char *name = REGISTER_NAME (c); | |
910 | if (name != NULL && *name != '\0') | |
911 | { | |
912 | printing = 1; | |
913 | while (padding > 0) | |
914 | { | |
915 | printf_filtered (" "); | |
916 | padding--; | |
917 | } | |
918 | mn10300_print_register (name, c, reg_width); | |
919 | printf_filtered (" "); | |
920 | } | |
921 | else | |
922 | { | |
923 | padding += (reg_width + 2 + 8 + 1); | |
924 | } | |
925 | } | |
926 | if (printing) | |
927 | printf_filtered ("\n"); | |
928 | } | |
929 | } | |
930 | } | |
931 | ||
91225883 | 932 | /* Dump out the mn10300 speciic architecture information. */ |
c906108c | 933 | |
91225883 AC |
934 | static void |
935 | mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
936 | { | |
937 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
938 | fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n", | |
939 | tdep->am33_mode); | |
940 | } | |
c2d11a7d | 941 | |
91225883 AC |
942 | static struct gdbarch * |
943 | mn10300_gdbarch_init (struct gdbarch_info info, | |
944 | struct gdbarch_list *arches) | |
945 | { | |
946 | struct gdbarch *gdbarch; | |
947 | struct gdbarch_tdep *tdep = NULL; | |
948 | int am33_mode; | |
949 | gdbarch_register_name_ftype *register_name; | |
950 | int mach; | |
951 | int num_regs; | |
952 | ||
953 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
954 | if (arches != NULL) | |
955 | return arches->gdbarch; | |
956 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); | |
957 | gdbarch = gdbarch_alloc (&info, tdep); | |
958 | ||
959 | if (info.bfd_arch_info != NULL | |
f6df245f | 960 | && info.bfd_arch_info->arch == bfd_arch_mn10300) |
91225883 AC |
961 | mach = info.bfd_arch_info->mach; |
962 | else | |
963 | mach = 0; | |
964 | switch (mach) | |
965 | { | |
966 | case 0: | |
f6df245f | 967 | case bfd_mach_mn10300: |
91225883 AC |
968 | am33_mode = 0; |
969 | register_name = mn10300_generic_register_name; | |
970 | num_regs = 32; | |
971 | break; | |
972 | case bfd_mach_am33: | |
c2d11a7d | 973 | am33_mode = 1; |
91225883 AC |
974 | register_name = am33_register_name; |
975 | num_regs = 32; | |
976 | break; | |
977 | default: | |
8e65ff28 AC |
978 | internal_error (__FILE__, __LINE__, |
979 | "mn10300_gdbarch_init: Unknown mn10300 variant"); | |
91225883 | 980 | return NULL; /* keep GCC happy. */ |
c2d11a7d | 981 | } |
c906108c | 982 | |
f6df245f AC |
983 | set_gdbarch_register_size (gdbarch, 4); |
984 | set_gdbarch_max_register_raw_size (gdbarch, 4); | |
985 | set_gdbarch_register_virtual_type (gdbarch, mn10300_register_virtual_type); | |
986 | set_gdbarch_register_byte (gdbarch, mn10300_register_byte); | |
987 | set_gdbarch_register_virtual_size (gdbarch, mn10300_register_virtual_size); | |
988 | set_gdbarch_register_raw_size (gdbarch, mn10300_register_raw_size); | |
91225883 AC |
989 | set_gdbarch_call_dummy_p (gdbarch, 1); |
990 | set_gdbarch_register_name (gdbarch, register_name); | |
991 | set_gdbarch_use_generic_dummy_frames (gdbarch, 1); | |
992 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 0); | |
993 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); | |
994 | set_gdbarch_get_saved_register (gdbarch, generic_get_saved_register); | |
995 | set_gdbarch_push_arguments (gdbarch, mn10300_push_arguments); | |
996 | set_gdbarch_push_return_address (gdbarch, mn10300_push_return_address); | |
997 | set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid); | |
998 | set_gdbarch_reg_struct_has_addr (gdbarch, mn10300_reg_struct_has_addr); | |
999 | set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos); | |
1000 | set_gdbarch_num_regs (gdbarch, num_regs); | |
f6df245f AC |
1001 | set_gdbarch_do_registers_info (gdbarch, mn10300_do_registers_info); |
1002 | ||
91225883 AC |
1003 | tdep->am33_mode = am33_mode; |
1004 | ||
1005 | return gdbarch; | |
1006 | } | |
1007 | ||
c906108c | 1008 | void |
fba45db2 | 1009 | _initialize_mn10300_tdep (void) |
c906108c SS |
1010 | { |
1011 | /* printf("_initialize_mn10300_tdep\n"); */ | |
1012 | ||
1013 | tm_print_insn = print_insn_mn10300; | |
1014 | ||
91225883 | 1015 | register_gdbarch_init (bfd_arch_mn10300, mn10300_gdbarch_init); |
c906108c | 1016 | } |