Commit | Line | Data |
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c906108c | 1 | /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. |
b6ba6518 | 2 | Copyright 1996, 1997, 1998, 1999, 2000, 2001 |
8e65ff28 | 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" | |
4e052eda | 32 | #include "regcache.h" |
c906108c | 33 | |
c2c6d25f | 34 | extern void _initialize_mn10300_tdep (void); |
a14ed312 KB |
35 | static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi, |
36 | CORE_ADDR pc); | |
c906108c | 37 | |
91225883 AC |
38 | /* mn10300 private data */ |
39 | struct gdbarch_tdep | |
40 | { | |
41 | int am33_mode; | |
42 | #define AM33_MODE (gdbarch_tdep (current_gdbarch)->am33_mode) | |
43 | }; | |
44 | ||
c906108c SS |
45 | /* Additional info used by the frame */ |
46 | ||
47 | struct frame_extra_info | |
c5aa993b JM |
48 | { |
49 | int status; | |
50 | int stack_size; | |
51 | }; | |
c906108c | 52 | |
0f71a2f6 | 53 | |
91225883 AC |
54 | static char * |
55 | register_name (int reg, char **regs, long sizeof_regs) | |
c2d11a7d | 56 | { |
91225883 AC |
57 | if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0])) |
58 | return NULL; | |
59 | else | |
60 | return regs[reg]; | |
61 | } | |
62 | ||
63 | static char * | |
64 | mn10300_generic_register_name (int reg) | |
0f71a2f6 | 65 | { |
91225883 AC |
66 | static char *regs[] = |
67 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
68 | "sp", "pc", "mdr", "psw", "lir", "lar", "", "", | |
69 | "", "", "", "", "", "", "", "", | |
70 | "", "", "", "", "", "", "", "fp" | |
71 | }; | |
72 | return register_name (reg, regs, sizeof regs); | |
0f71a2f6 JM |
73 | } |
74 | ||
91225883 AC |
75 | |
76 | static char * | |
77 | am33_register_name (int reg) | |
78 | { | |
79 | static char *regs[] = | |
80 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
81 | "sp", "pc", "mdr", "psw", "lir", "lar", "", | |
82 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
83 | "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", "" | |
84 | }; | |
85 | return register_name (reg, regs, sizeof regs); | |
86 | } | |
87 | ||
0f71a2f6 | 88 | CORE_ADDR |
fba45db2 | 89 | mn10300_saved_pc_after_call (struct frame_info *fi) |
0f71a2f6 JM |
90 | { |
91 | return read_memory_integer (read_register (SP_REGNUM), 4); | |
92 | } | |
93 | ||
94 | void | |
fba45db2 | 95 | mn10300_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
0f71a2f6 JM |
96 | { |
97 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
98 | memcpy (valbuf, regbuf + REGISTER_BYTE (4), TYPE_LENGTH (type)); | |
99 | else | |
100 | memcpy (valbuf, regbuf + REGISTER_BYTE (0), TYPE_LENGTH (type)); | |
101 | } | |
102 | ||
103 | CORE_ADDR | |
fba45db2 | 104 | mn10300_extract_struct_value_address (char *regbuf) |
0f71a2f6 JM |
105 | { |
106 | return extract_address (regbuf + REGISTER_BYTE (4), | |
107 | REGISTER_RAW_SIZE (4)); | |
108 | } | |
109 | ||
110 | void | |
fba45db2 | 111 | mn10300_store_return_value (struct type *type, char *valbuf) |
0f71a2f6 JM |
112 | { |
113 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
114 | write_register_bytes (REGISTER_BYTE (4), valbuf, TYPE_LENGTH (type)); | |
115 | else | |
116 | write_register_bytes (REGISTER_BYTE (0), valbuf, TYPE_LENGTH (type)); | |
117 | } | |
118 | ||
a14ed312 | 119 | static struct frame_info *analyze_dummy_frame (CORE_ADDR, CORE_ADDR); |
c906108c | 120 | static struct frame_info * |
fba45db2 | 121 | analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame) |
c906108c SS |
122 | { |
123 | static struct frame_info *dummy = NULL; | |
124 | if (dummy == NULL) | |
125 | { | |
126 | dummy = xmalloc (sizeof (struct frame_info)); | |
127 | dummy->saved_regs = xmalloc (SIZEOF_FRAME_SAVED_REGS); | |
128 | dummy->extra_info = xmalloc (sizeof (struct frame_extra_info)); | |
129 | } | |
130 | dummy->next = NULL; | |
131 | dummy->prev = NULL; | |
132 | dummy->pc = pc; | |
133 | dummy->frame = frame; | |
134 | dummy->extra_info->status = 0; | |
135 | dummy->extra_info->stack_size = 0; | |
136 | memset (dummy->saved_regs, '\000', SIZEOF_FRAME_SAVED_REGS); | |
137 | mn10300_analyze_prologue (dummy, 0); | |
138 | return dummy; | |
139 | } | |
140 | ||
141 | /* Values for frame_info.status */ | |
142 | ||
143 | #define MY_FRAME_IN_SP 0x1 | |
144 | #define MY_FRAME_IN_FP 0x2 | |
145 | #define NO_MORE_FRAMES 0x4 | |
146 | ||
147 | ||
148 | /* Should call_function allocate stack space for a struct return? */ | |
149 | int | |
fba45db2 | 150 | mn10300_use_struct_convention (int gcc_p, struct type *type) |
c906108c SS |
151 | { |
152 | return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8); | |
153 | } | |
154 | ||
155 | /* The breakpoint instruction must be the same size as the smallest | |
156 | instruction in the instruction set. | |
157 | ||
158 | The Matsushita mn10x00 processors have single byte instructions | |
159 | so we need a single byte breakpoint. Matsushita hasn't defined | |
160 | one, so we defined it ourselves. */ | |
161 | ||
162 | unsigned char * | |
fba45db2 | 163 | mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size) |
c906108c | 164 | { |
c5aa993b JM |
165 | static char breakpoint[] = |
166 | {0xff}; | |
c906108c SS |
167 | *bp_size = 1; |
168 | return breakpoint; | |
169 | } | |
170 | ||
171 | ||
172 | /* Fix fi->frame if it's bogus at this point. This is a helper | |
173 | function for mn10300_analyze_prologue. */ | |
174 | ||
175 | static void | |
fba45db2 | 176 | fix_frame_pointer (struct frame_info *fi, int stack_size) |
c906108c SS |
177 | { |
178 | if (fi && fi->next == NULL) | |
179 | { | |
180 | if (fi->extra_info->status & MY_FRAME_IN_SP) | |
181 | fi->frame = read_sp () - stack_size; | |
182 | else if (fi->extra_info->status & MY_FRAME_IN_FP) | |
183 | fi->frame = read_register (A3_REGNUM); | |
184 | } | |
185 | } | |
186 | ||
187 | ||
188 | /* Set offsets of registers saved by movm instruction. | |
189 | This is a helper function for mn10300_analyze_prologue. */ | |
190 | ||
191 | static void | |
fba45db2 | 192 | set_movm_offsets (struct frame_info *fi, int movm_args) |
c906108c SS |
193 | { |
194 | int offset = 0; | |
195 | ||
196 | if (fi == NULL || movm_args == 0) | |
197 | return; | |
198 | ||
199 | if (movm_args & 0x10) | |
200 | { | |
201 | fi->saved_regs[A3_REGNUM] = fi->frame + offset; | |
202 | offset += 4; | |
203 | } | |
204 | if (movm_args & 0x20) | |
205 | { | |
206 | fi->saved_regs[A2_REGNUM] = fi->frame + offset; | |
207 | offset += 4; | |
208 | } | |
209 | if (movm_args & 0x40) | |
210 | { | |
211 | fi->saved_regs[D3_REGNUM] = fi->frame + offset; | |
212 | offset += 4; | |
213 | } | |
214 | if (movm_args & 0x80) | |
215 | { | |
216 | fi->saved_regs[D2_REGNUM] = fi->frame + offset; | |
217 | offset += 4; | |
218 | } | |
91225883 | 219 | if (AM33_MODE && movm_args & 0x02) |
c2d11a7d JM |
220 | { |
221 | fi->saved_regs[E0_REGNUM + 5] = fi->frame + offset; | |
222 | fi->saved_regs[E0_REGNUM + 4] = fi->frame + offset + 4; | |
223 | fi->saved_regs[E0_REGNUM + 3] = fi->frame + offset + 8; | |
224 | fi->saved_regs[E0_REGNUM + 2] = fi->frame + offset + 12; | |
225 | } | |
c906108c SS |
226 | } |
227 | ||
228 | ||
229 | /* The main purpose of this file is dealing with prologues to extract | |
230 | information about stack frames and saved registers. | |
231 | ||
232 | For reference here's how prologues look on the mn10300: | |
233 | ||
c5aa993b JM |
234 | With frame pointer: |
235 | movm [d2,d3,a2,a3],sp | |
236 | mov sp,a3 | |
237 | add <size>,sp | |
c906108c | 238 | |
c5aa993b JM |
239 | Without frame pointer: |
240 | movm [d2,d3,a2,a3],sp (if needed) | |
241 | add <size>,sp | |
c906108c SS |
242 | |
243 | One day we might keep the stack pointer constant, that won't | |
244 | change the code for prologues, but it will make the frame | |
245 | pointerless case much more common. */ | |
c5aa993b | 246 | |
c906108c SS |
247 | /* Analyze the prologue to determine where registers are saved, |
248 | the end of the prologue, etc etc. Return the end of the prologue | |
249 | scanned. | |
250 | ||
251 | We store into FI (if non-null) several tidbits of information: | |
252 | ||
c5aa993b JM |
253 | * stack_size -- size of this stack frame. Note that if we stop in |
254 | certain parts of the prologue/epilogue we may claim the size of the | |
255 | current frame is zero. This happens when the current frame has | |
256 | not been allocated yet or has already been deallocated. | |
c906108c | 257 | |
c5aa993b | 258 | * fsr -- Addresses of registers saved in the stack by this frame. |
c906108c | 259 | |
c5aa993b JM |
260 | * status -- A (relatively) generic status indicator. It's a bitmask |
261 | with the following bits: | |
c906108c | 262 | |
c5aa993b JM |
263 | MY_FRAME_IN_SP: The base of the current frame is actually in |
264 | the stack pointer. This can happen for frame pointerless | |
265 | functions, or cases where we're stopped in the prologue/epilogue | |
266 | itself. For these cases mn10300_analyze_prologue will need up | |
267 | update fi->frame before returning or analyzing the register | |
268 | save instructions. | |
c906108c | 269 | |
c5aa993b JM |
270 | MY_FRAME_IN_FP: The base of the current frame is in the |
271 | frame pointer register ($a2). | |
c906108c | 272 | |
c5aa993b JM |
273 | NO_MORE_FRAMES: Set this if the current frame is "start" or |
274 | if the first instruction looks like mov <imm>,sp. This tells | |
275 | frame chain to not bother trying to unwind past this frame. */ | |
c906108c SS |
276 | |
277 | static CORE_ADDR | |
fba45db2 | 278 | mn10300_analyze_prologue (struct frame_info *fi, CORE_ADDR pc) |
c906108c SS |
279 | { |
280 | CORE_ADDR func_addr, func_end, addr, stop; | |
281 | CORE_ADDR stack_size; | |
282 | int imm_size; | |
283 | unsigned char buf[4]; | |
284 | int status, movm_args = 0; | |
285 | char *name; | |
286 | ||
287 | /* Use the PC in the frame if it's provided to look up the | |
288 | start of this function. */ | |
289 | pc = (fi ? fi->pc : pc); | |
290 | ||
291 | /* Find the start of this function. */ | |
292 | status = find_pc_partial_function (pc, &name, &func_addr, &func_end); | |
293 | ||
294 | /* Do nothing if we couldn't find the start of this function or if we're | |
295 | stopped at the first instruction in the prologue. */ | |
296 | if (status == 0) | |
43ff13b4 JM |
297 | { |
298 | return pc; | |
299 | } | |
c906108c SS |
300 | |
301 | /* If we're in start, then give up. */ | |
302 | if (strcmp (name, "start") == 0) | |
303 | { | |
304 | if (fi != NULL) | |
305 | fi->extra_info->status = NO_MORE_FRAMES; | |
306 | return pc; | |
307 | } | |
308 | ||
309 | /* At the start of a function our frame is in the stack pointer. */ | |
310 | if (fi) | |
311 | fi->extra_info->status = MY_FRAME_IN_SP; | |
312 | ||
313 | /* Get the next two bytes into buf, we need two because rets is a two | |
314 | byte insn and the first isn't enough to uniquely identify it. */ | |
315 | status = read_memory_nobpt (pc, buf, 2); | |
316 | if (status != 0) | |
317 | return pc; | |
318 | ||
319 | /* If we're physically on an "rets" instruction, then our frame has | |
320 | already been deallocated. Note this can also be true for retf | |
321 | and ret if they specify a size of zero. | |
322 | ||
323 | In this case fi->frame is bogus, we need to fix it. */ | |
324 | if (fi && buf[0] == 0xf0 && buf[1] == 0xfc) | |
325 | { | |
326 | if (fi->next == NULL) | |
327 | fi->frame = read_sp (); | |
328 | return fi->pc; | |
329 | } | |
330 | ||
331 | /* Similarly if we're stopped on the first insn of a prologue as our | |
332 | frame hasn't been allocated yet. */ | |
333 | if (fi && fi->pc == func_addr) | |
334 | { | |
335 | if (fi->next == NULL) | |
336 | fi->frame = read_sp (); | |
337 | return fi->pc; | |
338 | } | |
339 | ||
340 | /* Figure out where to stop scanning. */ | |
341 | stop = fi ? fi->pc : func_end; | |
342 | ||
343 | /* Don't walk off the end of the function. */ | |
344 | stop = stop > func_end ? func_end : stop; | |
345 | ||
346 | /* Start scanning on the first instruction of this function. */ | |
347 | addr = func_addr; | |
348 | ||
349 | /* Suck in two bytes. */ | |
350 | status = read_memory_nobpt (addr, buf, 2); | |
351 | if (status != 0) | |
352 | { | |
353 | fix_frame_pointer (fi, 0); | |
354 | return addr; | |
355 | } | |
356 | ||
357 | /* First see if this insn sets the stack pointer; if so, it's something | |
358 | we won't understand, so quit now. */ | |
359 | if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0) | |
360 | { | |
361 | if (fi) | |
362 | fi->extra_info->status = NO_MORE_FRAMES; | |
363 | return addr; | |
364 | } | |
365 | ||
366 | /* Now look for movm [regs],sp, which saves the callee saved registers. | |
367 | ||
368 | At this time we don't know if fi->frame is valid, so we only note | |
369 | that we encountered a movm instruction. Later, we'll set the entries | |
370 | in fsr.regs as needed. */ | |
371 | if (buf[0] == 0xcf) | |
372 | { | |
373 | /* Extract the register list for the movm instruction. */ | |
374 | status = read_memory_nobpt (addr + 1, buf, 1); | |
375 | movm_args = *buf; | |
376 | ||
377 | addr += 2; | |
378 | ||
379 | /* Quit now if we're beyond the stop point. */ | |
380 | if (addr >= stop) | |
381 | { | |
382 | /* Fix fi->frame since it's bogus at this point. */ | |
383 | if (fi && fi->next == NULL) | |
384 | fi->frame = read_sp (); | |
385 | ||
386 | /* Note if/where callee saved registers were saved. */ | |
387 | set_movm_offsets (fi, movm_args); | |
388 | return addr; | |
389 | } | |
390 | ||
391 | /* Get the next two bytes so the prologue scan can continue. */ | |
392 | status = read_memory_nobpt (addr, buf, 2); | |
393 | if (status != 0) | |
394 | { | |
395 | /* Fix fi->frame since it's bogus at this point. */ | |
396 | if (fi && fi->next == NULL) | |
397 | fi->frame = read_sp (); | |
398 | ||
399 | /* Note if/where callee saved registers were saved. */ | |
400 | set_movm_offsets (fi, movm_args); | |
401 | return addr; | |
402 | } | |
403 | } | |
404 | ||
405 | /* Now see if we set up a frame pointer via "mov sp,a3" */ | |
406 | if (buf[0] == 0x3f) | |
407 | { | |
408 | addr += 1; | |
409 | ||
410 | /* The frame pointer is now valid. */ | |
411 | if (fi) | |
412 | { | |
413 | fi->extra_info->status |= MY_FRAME_IN_FP; | |
414 | fi->extra_info->status &= ~MY_FRAME_IN_SP; | |
415 | } | |
416 | ||
417 | /* Quit now if we're beyond the stop point. */ | |
418 | if (addr >= stop) | |
419 | { | |
420 | /* Fix fi->frame if it's bogus at this point. */ | |
421 | fix_frame_pointer (fi, 0); | |
422 | ||
423 | /* Note if/where callee saved registers were saved. */ | |
424 | set_movm_offsets (fi, movm_args); | |
425 | return addr; | |
426 | } | |
427 | ||
428 | /* Get two more bytes so scanning can continue. */ | |
429 | status = read_memory_nobpt (addr, buf, 2); | |
430 | if (status != 0) | |
431 | { | |
432 | /* Fix fi->frame if it's bogus at this point. */ | |
433 | fix_frame_pointer (fi, 0); | |
434 | ||
435 | /* Note if/where callee saved registers were saved. */ | |
436 | set_movm_offsets (fi, movm_args); | |
437 | return addr; | |
438 | } | |
439 | } | |
c5aa993b | 440 | |
c906108c SS |
441 | /* Next we should allocate the local frame. No more prologue insns |
442 | are found after allocating the local frame. | |
c5aa993b | 443 | |
c906108c | 444 | Search for add imm8,sp (0xf8feXX) |
c5aa993b JM |
445 | or add imm16,sp (0xfafeXXXX) |
446 | or add imm32,sp (0xfcfeXXXXXXXX). | |
447 | ||
c906108c SS |
448 | If none of the above was found, then this prologue has no |
449 | additional stack. */ | |
450 | ||
451 | status = read_memory_nobpt (addr, buf, 2); | |
452 | if (status != 0) | |
453 | { | |
454 | /* Fix fi->frame if it's bogus at this point. */ | |
455 | fix_frame_pointer (fi, 0); | |
456 | ||
457 | /* Note if/where callee saved registers were saved. */ | |
458 | set_movm_offsets (fi, movm_args); | |
459 | return addr; | |
460 | } | |
461 | ||
462 | imm_size = 0; | |
463 | if (buf[0] == 0xf8 && buf[1] == 0xfe) | |
464 | imm_size = 1; | |
465 | else if (buf[0] == 0xfa && buf[1] == 0xfe) | |
466 | imm_size = 2; | |
467 | else if (buf[0] == 0xfc && buf[1] == 0xfe) | |
468 | imm_size = 4; | |
469 | ||
470 | if (imm_size != 0) | |
471 | { | |
472 | /* Suck in imm_size more bytes, they'll hold the size of the | |
473 | current frame. */ | |
474 | status = read_memory_nobpt (addr + 2, buf, imm_size); | |
475 | if (status != 0) | |
476 | { | |
477 | /* Fix fi->frame if it's bogus at this point. */ | |
478 | fix_frame_pointer (fi, 0); | |
479 | ||
480 | /* Note if/where callee saved registers were saved. */ | |
481 | set_movm_offsets (fi, movm_args); | |
482 | return addr; | |
483 | } | |
484 | ||
485 | /* Note the size of the stack in the frame info structure. */ | |
486 | stack_size = extract_signed_integer (buf, imm_size); | |
487 | if (fi) | |
488 | fi->extra_info->stack_size = stack_size; | |
489 | ||
490 | /* We just consumed 2 + imm_size bytes. */ | |
491 | addr += 2 + imm_size; | |
492 | ||
493 | /* No more prologue insns follow, so begin preparation to return. */ | |
494 | /* Fix fi->frame if it's bogus at this point. */ | |
495 | fix_frame_pointer (fi, stack_size); | |
496 | ||
497 | /* Note if/where callee saved registers were saved. */ | |
498 | set_movm_offsets (fi, movm_args); | |
499 | return addr; | |
500 | } | |
501 | ||
502 | /* We never found an insn which allocates local stack space, regardless | |
503 | this is the end of the prologue. */ | |
504 | /* Fix fi->frame if it's bogus at this point. */ | |
505 | fix_frame_pointer (fi, 0); | |
506 | ||
507 | /* Note if/where callee saved registers were saved. */ | |
508 | set_movm_offsets (fi, movm_args); | |
509 | return addr; | |
510 | } | |
c5aa993b | 511 | |
c906108c SS |
512 | /* Function: frame_chain |
513 | Figure out and return the caller's frame pointer given current | |
514 | frame_info struct. | |
515 | ||
516 | We don't handle dummy frames yet but we would probably just return the | |
517 | stack pointer that was in use at the time the function call was made? */ | |
518 | ||
519 | CORE_ADDR | |
fba45db2 | 520 | mn10300_frame_chain (struct frame_info *fi) |
c906108c SS |
521 | { |
522 | struct frame_info *dummy; | |
523 | /* Walk through the prologue to determine the stack size, | |
524 | location of saved registers, end of the prologue, etc. */ | |
525 | if (fi->extra_info->status == 0) | |
c5aa993b | 526 | mn10300_analyze_prologue (fi, (CORE_ADDR) 0); |
c906108c SS |
527 | |
528 | /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */ | |
529 | if (fi->extra_info->status & NO_MORE_FRAMES) | |
530 | return 0; | |
531 | ||
532 | /* Now that we've analyzed our prologue, determine the frame | |
533 | pointer for our caller. | |
534 | ||
c5aa993b JM |
535 | If our caller has a frame pointer, then we need to |
536 | find the entry value of $a3 to our function. | |
537 | ||
538 | If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory | |
539 | location pointed to by fsr.regs[A3_REGNUM]. | |
c906108c | 540 | |
c5aa993b | 541 | Else it's still in $a3. |
c906108c | 542 | |
c5aa993b JM |
543 | If our caller does not have a frame pointer, then his |
544 | frame base is fi->frame + -caller's stack size. */ | |
c906108c | 545 | |
c906108c SS |
546 | /* The easiest way to get that info is to analyze our caller's frame. |
547 | So we set up a dummy frame and call mn10300_analyze_prologue to | |
548 | find stuff for us. */ | |
549 | dummy = analyze_dummy_frame (FRAME_SAVED_PC (fi), fi->frame); | |
550 | ||
551 | if (dummy->extra_info->status & MY_FRAME_IN_FP) | |
552 | { | |
553 | /* Our caller has a frame pointer. So find the frame in $a3 or | |
554 | in the stack. */ | |
555 | if (fi->saved_regs[A3_REGNUM]) | |
556 | return (read_memory_integer (fi->saved_regs[A3_REGNUM], REGISTER_SIZE)); | |
557 | else | |
558 | return read_register (A3_REGNUM); | |
559 | } | |
560 | else | |
561 | { | |
562 | int adjust = 0; | |
563 | ||
564 | adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0); | |
565 | adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0); | |
566 | adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0); | |
567 | adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0); | |
91225883 | 568 | if (AM33_MODE) |
c2d11a7d JM |
569 | { |
570 | adjust += (fi->saved_regs[E0_REGNUM + 5] ? 4 : 0); | |
571 | adjust += (fi->saved_regs[E0_REGNUM + 4] ? 4 : 0); | |
572 | adjust += (fi->saved_regs[E0_REGNUM + 3] ? 4 : 0); | |
573 | adjust += (fi->saved_regs[E0_REGNUM + 2] ? 4 : 0); | |
574 | } | |
c906108c SS |
575 | |
576 | /* Our caller does not have a frame pointer. So his frame starts | |
c5aa993b JM |
577 | at the base of our frame (fi->frame) + register save space |
578 | + <his size>. */ | |
c906108c SS |
579 | return fi->frame + adjust + -dummy->extra_info->stack_size; |
580 | } | |
581 | } | |
582 | ||
583 | /* Function: skip_prologue | |
584 | Return the address of the first inst past the prologue of the function. */ | |
585 | ||
586 | CORE_ADDR | |
fba45db2 | 587 | mn10300_skip_prologue (CORE_ADDR pc) |
c906108c SS |
588 | { |
589 | /* We used to check the debug symbols, but that can lose if | |
590 | we have a null prologue. */ | |
591 | return mn10300_analyze_prologue (NULL, pc); | |
592 | } | |
593 | ||
594 | ||
595 | /* Function: pop_frame | |
596 | This routine gets called when either the user uses the `return' | |
597 | command, or the call dummy breakpoint gets hit. */ | |
598 | ||
599 | void | |
fba45db2 | 600 | mn10300_pop_frame (struct frame_info *frame) |
c906108c SS |
601 | { |
602 | int regnum; | |
603 | ||
c5aa993b | 604 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
c906108c SS |
605 | generic_pop_dummy_frame (); |
606 | else | |
607 | { | |
608 | write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); | |
609 | ||
610 | /* Restore any saved registers. */ | |
611 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
612 | if (frame->saved_regs[regnum] != 0) | |
613 | { | |
614 | ULONGEST value; | |
615 | ||
616 | value = read_memory_unsigned_integer (frame->saved_regs[regnum], | |
c5aa993b | 617 | REGISTER_RAW_SIZE (regnum)); |
c906108c SS |
618 | write_register (regnum, value); |
619 | } | |
620 | ||
621 | /* Actually cut back the stack. */ | |
622 | write_register (SP_REGNUM, FRAME_FP (frame)); | |
623 | ||
624 | /* Don't we need to set the PC?!? XXX FIXME. */ | |
625 | } | |
626 | ||
627 | /* Throw away any cached frame information. */ | |
628 | flush_cached_frames (); | |
629 | } | |
630 | ||
631 | /* Function: push_arguments | |
632 | Setup arguments for a call to the target. Arguments go in | |
633 | order on the stack. */ | |
634 | ||
635 | CORE_ADDR | |
91225883 AC |
636 | mn10300_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
637 | int struct_return, CORE_ADDR struct_addr) | |
c906108c SS |
638 | { |
639 | int argnum = 0; | |
640 | int len = 0; | |
641 | int stack_offset = 0; | |
642 | int regsused = struct_return ? 1 : 0; | |
643 | ||
644 | /* This should be a nop, but align the stack just in case something | |
645 | went wrong. Stacks are four byte aligned on the mn10300. */ | |
646 | sp &= ~3; | |
647 | ||
648 | /* Now make space on the stack for the args. | |
649 | ||
650 | XXX This doesn't appear to handle pass-by-invisible reference | |
651 | arguments. */ | |
652 | for (argnum = 0; argnum < nargs; argnum++) | |
653 | { | |
654 | int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3; | |
655 | ||
656 | while (regsused < 2 && arg_length > 0) | |
657 | { | |
658 | regsused++; | |
659 | arg_length -= 4; | |
660 | } | |
661 | len += arg_length; | |
662 | } | |
663 | ||
664 | /* Allocate stack space. */ | |
665 | sp -= len; | |
666 | ||
667 | regsused = struct_return ? 1 : 0; | |
668 | /* Push all arguments onto the stack. */ | |
669 | for (argnum = 0; argnum < nargs; argnum++) | |
670 | { | |
671 | int len; | |
672 | char *val; | |
673 | ||
674 | /* XXX Check this. What about UNIONS? */ | |
675 | if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT | |
676 | && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) | |
677 | { | |
678 | /* XXX Wrong, we want a pointer to this argument. */ | |
c5aa993b JM |
679 | len = TYPE_LENGTH (VALUE_TYPE (*args)); |
680 | val = (char *) VALUE_CONTENTS (*args); | |
c906108c SS |
681 | } |
682 | else | |
683 | { | |
684 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
c5aa993b | 685 | val = (char *) VALUE_CONTENTS (*args); |
c906108c SS |
686 | } |
687 | ||
688 | while (regsused < 2 && len > 0) | |
689 | { | |
690 | write_register (regsused, extract_unsigned_integer (val, 4)); | |
691 | val += 4; | |
692 | len -= 4; | |
693 | regsused++; | |
694 | } | |
695 | ||
696 | while (len > 0) | |
697 | { | |
698 | write_memory (sp + stack_offset, val, 4); | |
699 | len -= 4; | |
700 | val += 4; | |
701 | stack_offset += 4; | |
702 | } | |
703 | ||
704 | args++; | |
705 | } | |
706 | ||
707 | /* Make space for the flushback area. */ | |
708 | sp -= 8; | |
709 | return sp; | |
710 | } | |
711 | ||
712 | /* Function: push_return_address (pc) | |
713 | Set up the return address for the inferior function call. | |
714 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
c5aa993b | 715 | |
c906108c | 716 | CORE_ADDR |
fba45db2 | 717 | mn10300_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
c906108c SS |
718 | { |
719 | unsigned char buf[4]; | |
720 | ||
721 | store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ()); | |
722 | write_memory (sp - 4, buf, 4); | |
723 | return sp - 4; | |
724 | } | |
725 | ||
726 | /* Function: store_struct_return (addr,sp) | |
727 | Store the structure value return address for an inferior function | |
728 | call. */ | |
c5aa993b | 729 | |
c906108c | 730 | CORE_ADDR |
fba45db2 | 731 | mn10300_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
c906108c SS |
732 | { |
733 | /* The structure return address is passed as the first argument. */ | |
734 | write_register (0, addr); | |
735 | return sp; | |
736 | } | |
c5aa993b | 737 | |
c906108c SS |
738 | /* Function: frame_saved_pc |
739 | Find the caller of this frame. We do this by seeing if RP_REGNUM | |
740 | is saved in the stack anywhere, otherwise we get it from the | |
741 | registers. If the inner frame is a dummy frame, return its PC | |
742 | instead of RP, because that's where "caller" of the dummy-frame | |
743 | will be found. */ | |
744 | ||
745 | CORE_ADDR | |
fba45db2 | 746 | mn10300_frame_saved_pc (struct frame_info *fi) |
c906108c SS |
747 | { |
748 | int adjust = 0; | |
749 | ||
750 | adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0); | |
751 | adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0); | |
752 | adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0); | |
753 | adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0); | |
91225883 | 754 | if (AM33_MODE) |
c2d11a7d JM |
755 | { |
756 | adjust += (fi->saved_regs[E0_REGNUM + 5] ? 4 : 0); | |
757 | adjust += (fi->saved_regs[E0_REGNUM + 4] ? 4 : 0); | |
758 | adjust += (fi->saved_regs[E0_REGNUM + 3] ? 4 : 0); | |
759 | adjust += (fi->saved_regs[E0_REGNUM + 2] ? 4 : 0); | |
760 | } | |
c906108c SS |
761 | |
762 | return (read_memory_integer (fi->frame + adjust, REGISTER_SIZE)); | |
763 | } | |
764 | ||
c906108c SS |
765 | /* Function: mn10300_init_extra_frame_info |
766 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
767 | registers. Most of the work is done in mn10300_analyze_prologue(). | |
768 | ||
769 | Note that when we are called for the last frame (currently active frame), | |
770 | that fi->pc and fi->frame will already be setup. However, fi->frame will | |
771 | be valid only if this routine uses FP. For previous frames, fi-frame will | |
772 | always be correct. mn10300_analyze_prologue will fix fi->frame if | |
773 | it's not valid. | |
774 | ||
775 | We can be called with the PC in the call dummy under two circumstances. | |
776 | First, during normal backtracing, second, while figuring out the frame | |
777 | pointer just prior to calling the target function (see run_stack_dummy). */ | |
778 | ||
779 | void | |
fba45db2 | 780 | mn10300_init_extra_frame_info (struct frame_info *fi) |
c906108c SS |
781 | { |
782 | if (fi->next) | |
783 | fi->pc = FRAME_SAVED_PC (fi->next); | |
784 | ||
785 | frame_saved_regs_zalloc (fi); | |
786 | fi->extra_info = (struct frame_extra_info *) | |
787 | frame_obstack_alloc (sizeof (struct frame_extra_info)); | |
788 | ||
789 | fi->extra_info->status = 0; | |
790 | fi->extra_info->stack_size = 0; | |
791 | ||
792 | mn10300_analyze_prologue (fi, 0); | |
793 | } | |
794 | ||
795 | /* Function: mn10300_virtual_frame_pointer | |
796 | Return the register that the function uses for a frame pointer, | |
797 | plus any necessary offset to be applied to the register before | |
798 | any frame pointer offsets. */ | |
799 | ||
800 | void | |
fba45db2 | 801 | mn10300_virtual_frame_pointer (CORE_ADDR pc, long *reg, long *offset) |
c906108c SS |
802 | { |
803 | struct frame_info *dummy = analyze_dummy_frame (pc, 0); | |
804 | /* Set up a dummy frame_info, Analyze the prolog and fill in the | |
805 | extra info. */ | |
806 | /* Results will tell us which type of frame it uses. */ | |
807 | if (dummy->extra_info->status & MY_FRAME_IN_SP) | |
808 | { | |
c5aa993b | 809 | *reg = SP_REGNUM; |
c906108c SS |
810 | *offset = -(dummy->extra_info->stack_size); |
811 | } | |
812 | else | |
813 | { | |
c5aa993b | 814 | *reg = A3_REGNUM; |
c906108c SS |
815 | *offset = 0; |
816 | } | |
817 | } | |
c5aa993b | 818 | |
91225883 AC |
819 | static int |
820 | mn10300_reg_struct_has_addr (int gcc_p, struct type *type) | |
c906108c | 821 | { |
91225883 AC |
822 | return (TYPE_LENGTH (type) > 8); |
823 | } | |
c906108c | 824 | |
f6df245f AC |
825 | static struct type * |
826 | mn10300_register_virtual_type (int reg) | |
827 | { | |
828 | return builtin_type_int; | |
829 | } | |
830 | ||
831 | static int | |
832 | mn10300_register_byte (int reg) | |
833 | { | |
834 | return (reg * 4); | |
835 | } | |
836 | ||
837 | static int | |
838 | mn10300_register_virtual_size (int reg) | |
839 | { | |
840 | return 4; | |
841 | } | |
842 | ||
843 | static int | |
844 | mn10300_register_raw_size (int reg) | |
845 | { | |
846 | return 4; | |
847 | } | |
848 | ||
849 | static void | |
850 | mn10300_print_register (const char *name, int regnum, int reg_width) | |
851 | { | |
852 | char *raw_buffer = alloca (MAX_REGISTER_RAW_SIZE); | |
853 | ||
854 | if (reg_width) | |
855 | printf_filtered ("%*s: ", reg_width, name); | |
856 | else | |
857 | printf_filtered ("%s: ", name); | |
858 | ||
859 | /* Get the data */ | |
860 | if (read_relative_register_raw_bytes (regnum, raw_buffer)) | |
861 | { | |
862 | printf_filtered ("[invalid]"); | |
863 | return; | |
864 | } | |
865 | else | |
866 | { | |
867 | int byte; | |
868 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
869 | { | |
870 | for (byte = REGISTER_RAW_SIZE (regnum) - REGISTER_VIRTUAL_SIZE (regnum); | |
871 | byte < REGISTER_RAW_SIZE (regnum); | |
872 | byte++) | |
873 | printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); | |
874 | } | |
875 | else | |
876 | { | |
877 | for (byte = REGISTER_VIRTUAL_SIZE (regnum) - 1; | |
878 | byte >= 0; | |
879 | byte--) | |
880 | printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); | |
881 | } | |
882 | } | |
883 | } | |
884 | ||
885 | static void | |
886 | mn10300_do_registers_info (int regnum, int fpregs) | |
887 | { | |
888 | if (regnum >= 0) | |
889 | { | |
890 | const char *name = REGISTER_NAME (regnum); | |
891 | if (name == NULL || name[0] == '\0') | |
892 | error ("Not a valid register for the current processor type"); | |
893 | mn10300_print_register (name, regnum, 0); | |
894 | printf_filtered ("\n"); | |
895 | } | |
896 | else | |
897 | { | |
898 | /* print registers in an array 4x8 */ | |
899 | int r; | |
900 | int reg; | |
901 | const int nr_in_row = 4; | |
902 | const int reg_width = 4; | |
903 | for (r = 0; r < NUM_REGS; r += nr_in_row) | |
904 | { | |
905 | int c; | |
906 | int printing = 0; | |
907 | int padding = 0; | |
908 | for (c = r; c < r + nr_in_row; c++) | |
909 | { | |
910 | const char *name = REGISTER_NAME (c); | |
911 | if (name != NULL && *name != '\0') | |
912 | { | |
913 | printing = 1; | |
914 | while (padding > 0) | |
915 | { | |
916 | printf_filtered (" "); | |
917 | padding--; | |
918 | } | |
919 | mn10300_print_register (name, c, reg_width); | |
920 | printf_filtered (" "); | |
921 | } | |
922 | else | |
923 | { | |
924 | padding += (reg_width + 2 + 8 + 1); | |
925 | } | |
926 | } | |
927 | if (printing) | |
928 | printf_filtered ("\n"); | |
929 | } | |
930 | } | |
931 | } | |
932 | ||
91225883 | 933 | /* Dump out the mn10300 speciic architecture information. */ |
c906108c | 934 | |
91225883 AC |
935 | static void |
936 | mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
937 | { | |
938 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
939 | fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n", | |
940 | tdep->am33_mode); | |
941 | } | |
c2d11a7d | 942 | |
91225883 AC |
943 | static struct gdbarch * |
944 | mn10300_gdbarch_init (struct gdbarch_info info, | |
945 | struct gdbarch_list *arches) | |
946 | { | |
947 | struct gdbarch *gdbarch; | |
948 | struct gdbarch_tdep *tdep = NULL; | |
949 | int am33_mode; | |
950 | gdbarch_register_name_ftype *register_name; | |
951 | int mach; | |
952 | int num_regs; | |
953 | ||
954 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
955 | if (arches != NULL) | |
956 | return arches->gdbarch; | |
957 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); | |
958 | gdbarch = gdbarch_alloc (&info, tdep); | |
959 | ||
960 | if (info.bfd_arch_info != NULL | |
f6df245f | 961 | && info.bfd_arch_info->arch == bfd_arch_mn10300) |
91225883 AC |
962 | mach = info.bfd_arch_info->mach; |
963 | else | |
964 | mach = 0; | |
965 | switch (mach) | |
966 | { | |
967 | case 0: | |
f6df245f | 968 | case bfd_mach_mn10300: |
91225883 AC |
969 | am33_mode = 0; |
970 | register_name = mn10300_generic_register_name; | |
971 | num_regs = 32; | |
972 | break; | |
973 | case bfd_mach_am33: | |
c2d11a7d | 974 | am33_mode = 1; |
91225883 AC |
975 | register_name = am33_register_name; |
976 | num_regs = 32; | |
977 | break; | |
978 | default: | |
8e65ff28 AC |
979 | internal_error (__FILE__, __LINE__, |
980 | "mn10300_gdbarch_init: Unknown mn10300 variant"); | |
91225883 | 981 | return NULL; /* keep GCC happy. */ |
c2d11a7d | 982 | } |
c906108c | 983 | |
f6df245f AC |
984 | set_gdbarch_register_size (gdbarch, 4); |
985 | set_gdbarch_max_register_raw_size (gdbarch, 4); | |
986 | set_gdbarch_register_virtual_type (gdbarch, mn10300_register_virtual_type); | |
987 | set_gdbarch_register_byte (gdbarch, mn10300_register_byte); | |
988 | set_gdbarch_register_virtual_size (gdbarch, mn10300_register_virtual_size); | |
989 | set_gdbarch_register_raw_size (gdbarch, mn10300_register_raw_size); | |
91225883 AC |
990 | set_gdbarch_call_dummy_p (gdbarch, 1); |
991 | set_gdbarch_register_name (gdbarch, register_name); | |
992 | set_gdbarch_use_generic_dummy_frames (gdbarch, 1); | |
993 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 0); | |
994 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); | |
995 | set_gdbarch_get_saved_register (gdbarch, generic_get_saved_register); | |
996 | set_gdbarch_push_arguments (gdbarch, mn10300_push_arguments); | |
997 | set_gdbarch_push_return_address (gdbarch, mn10300_push_return_address); | |
998 | set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid); | |
999 | set_gdbarch_reg_struct_has_addr (gdbarch, mn10300_reg_struct_has_addr); | |
1000 | set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos); | |
1001 | set_gdbarch_num_regs (gdbarch, num_regs); | |
f6df245f AC |
1002 | set_gdbarch_do_registers_info (gdbarch, mn10300_do_registers_info); |
1003 | ||
91225883 AC |
1004 | tdep->am33_mode = am33_mode; |
1005 | ||
1006 | return gdbarch; | |
1007 | } | |
1008 | ||
c906108c | 1009 | void |
fba45db2 | 1010 | _initialize_mn10300_tdep (void) |
c906108c SS |
1011 | { |
1012 | /* printf("_initialize_mn10300_tdep\n"); */ | |
1013 | ||
1014 | tm_print_insn = print_insn_mn10300; | |
1015 | ||
91225883 | 1016 | register_gdbarch_init (bfd_arch_mn10300, mn10300_gdbarch_init); |
c906108c | 1017 | } |