Commit | Line | Data |
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3de76938 | 1 | /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. |
b5b59a3c | 2 | Copyright 1996, 1997, 1998 Free Software Foundation, Inc. |
ddc2888e GN |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
3de76938 | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
ddc2888e GN |
19 | |
20 | #include "defs.h" | |
21 | #include "frame.h" | |
22 | #include "inferior.h" | |
23 | #include "obstack.h" | |
24 | #include "target.h" | |
25 | #include "value.h" | |
26 | #include "bfd.h" | |
27 | #include "gdb_string.h" | |
28 | #include "gdbcore.h" | |
29 | #include "symfile.h" | |
30 | ||
9ddf9aa9 AC |
31 | static char *mn10300_generic_register_names[] = |
32 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
33 | "sp", "pc", "mdr", "psw", "lir", "lar", "", "", | |
34 | "", "", "", "", "", "", "", "", | |
35 | "", "", "", "", "", "", "", "fp" }; | |
ddc2888e | 36 | |
9ddf9aa9 | 37 | char **mn10300_register_names = mn10300_generic_register_names; |
52e4073c | 38 | /* start-sanitize-am33 */ |
9ddf9aa9 | 39 | static char *am33_register_names [] = |
52e4073c MA |
40 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", |
41 | "sp", "pc", "mdr", "psw", "lir", "lar", "", | |
42 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
43 | "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""}; | |
9ddf9aa9 | 44 | static int am33_mode; |
52e4073c MA |
45 | /* end-sanitize-am33 */ |
46 | ||
11ac7952 MA |
47 | static CORE_ADDR mn10300_analyze_prologue PARAMS ((struct frame_info *fi, |
48 | CORE_ADDR pc)); | |
49 | ||
50 | /* Values for frame_info.status */ | |
51 | ||
52 | #define MY_FRAME_IN_SP 0x1 | |
53 | #define MY_FRAME_IN_FP 0x2 | |
54 | #define NO_MORE_FRAMES 0x4 | |
55 | ||
56 | ||
98760eab AC |
57 | /* Should call_function allocate stack space for a struct return? */ |
58 | int | |
59 | mn10300_use_struct_convention (gcc_p, type) | |
60 | int gcc_p; | |
61 | struct type *type; | |
62 | { | |
63 | return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8); | |
64 | } | |
65 | ||
afcad54a AC |
66 | /* The breakpoint instruction must be the same size as the smallest |
67 | instruction in the instruction set. | |
68 | ||
69 | The Matsushita mn10x00 processors have single byte instructions | |
70 | so we need a single byte breakpoint. Matsushita hasn't defined | |
71 | one, so we defined it ourselves. */ | |
72 | ||
73 | unsigned char * | |
74 | mn10300_breakpoint_from_pc (bp_addr, bp_size) | |
75 | CORE_ADDR *bp_addr; | |
76 | int *bp_size; | |
77 | { | |
78 | static char breakpoint[] = {0xff}; | |
79 | *bp_size = 1; | |
80 | return breakpoint; | |
81 | } | |
82 | ||
98760eab | 83 | |
11ac7952 MA |
84 | /* Fix fi->frame if it's bogus at this point. This is a helper |
85 | function for mn10300_analyze_prologue. */ | |
86 | ||
87 | static void | |
88 | fix_frame_pointer (fi, stack_size) | |
89 | struct frame_info *fi; | |
90 | int stack_size; | |
91 | { | |
92 | if (fi && fi->next == NULL) | |
93 | { | |
94 | if (fi->status & MY_FRAME_IN_SP) | |
95 | fi->frame = read_sp () - stack_size; | |
96 | else if (fi->status & MY_FRAME_IN_FP) | |
97 | fi->frame = read_register (A3_REGNUM); | |
98 | } | |
99 | } | |
100 | ||
52e4073c MA |
101 | |
102 | /* Set offsets of registers saved by movm instruction. | |
103 | This is a helper function for mn10300_analyze_prologue. */ | |
ddc2888e | 104 | |
52e4073c | 105 | static void |
11ac7952 | 106 | set_movm_offsets (fi, movm_args) |
52e4073c | 107 | struct frame_info *fi; |
11ac7952 | 108 | int movm_args; |
ddc2888e | 109 | { |
11ac7952 MA |
110 | int offset = 0; |
111 | ||
112 | if (fi == NULL || movm_args == 0) | |
52e4073c | 113 | return; |
11ac7952 MA |
114 | |
115 | if (movm_args & 0x10) | |
116 | { | |
117 | fi->fsr.regs[A3_REGNUM] = fi->frame + offset; | |
118 | offset += 4; | |
119 | } | |
120 | if (movm_args & 0x20) | |
121 | { | |
122 | fi->fsr.regs[A2_REGNUM] = fi->frame + offset; | |
123 | offset += 4; | |
124 | } | |
125 | if (movm_args & 0x40) | |
126 | { | |
127 | fi->fsr.regs[D3_REGNUM] = fi->frame + offset; | |
128 | offset += 4; | |
129 | } | |
130 | if (movm_args & 0x80) | |
131 | { | |
132 | fi->fsr.regs[D2_REGNUM] = fi->frame + offset; | |
133 | offset += 4; | |
134 | } | |
52e4073c | 135 | /* start-sanitize-am33 */ |
11ac7952 MA |
136 | if (am33_mode && movm_args & 0x02) |
137 | { | |
138 | fi->fsr.regs[E0_REGNUM+5] = fi->frame + offset; | |
139 | fi->fsr.regs[E0_REGNUM+4] = fi->frame + offset + 4; | |
140 | fi->fsr.regs[E0_REGNUM+3] = fi->frame + offset + 8; | |
141 | fi->fsr.regs[E0_REGNUM+2] = fi->frame + offset + 12; | |
142 | } | |
52e4073c MA |
143 | /* end-sanitize-am33 */ |
144 | } | |
ddc2888e | 145 | |
3de76938 | 146 | |
52e4073c MA |
147 | /* The main purpose of this file is dealing with prologues to extract |
148 | information about stack frames and saved registers. | |
3de76938 | 149 | |
52e4073c | 150 | For reference here's how prologues look on the mn10300: |
3de76938 | 151 | |
52e4073c MA |
152 | With frame pointer: |
153 | movm [d2,d3,a2,a3],sp | |
154 | mov sp,a3 | |
155 | add <size>,sp | |
156 | ||
157 | Without frame pointer: | |
158 | movm [d2,d3,a2,a3],sp (if needed) | |
159 | add <size>,sp | |
160 | ||
161 | One day we might keep the stack pointer constant, that won't | |
162 | change the code for prologues, but it will make the frame | |
163 | pointerless case much more common. */ | |
164 | ||
165 | /* Analyze the prologue to determine where registers are saved, | |
166 | the end of the prologue, etc etc. Return the end of the prologue | |
167 | scanned. | |
168 | ||
169 | We store into FI (if non-null) several tidbits of information: | |
170 | ||
171 | * stack_size -- size of this stack frame. Note that if we stop in | |
172 | certain parts of the prologue/epilogue we may claim the size of the | |
173 | current frame is zero. This happens when the current frame has | |
174 | not been allocated yet or has already been deallocated. | |
175 | ||
176 | * fsr -- Addresses of registers saved in the stack by this frame. | |
177 | ||
178 | * status -- A (relatively) generic status indicator. It's a bitmask | |
179 | with the following bits: | |
180 | ||
181 | MY_FRAME_IN_SP: The base of the current frame is actually in | |
182 | the stack pointer. This can happen for frame pointerless | |
183 | functions, or cases where we're stopped in the prologue/epilogue | |
184 | itself. For these cases mn10300_analyze_prologue will need up | |
185 | update fi->frame before returning or analyzing the register | |
186 | save instructions. | |
187 | ||
188 | MY_FRAME_IN_FP: The base of the current frame is in the | |
189 | frame pointer register ($a2). | |
190 | ||
191 | NO_MORE_FRAMES: Set this if the current frame is "start" or | |
192 | if the first instruction looks like mov <imm>,sp. This tells | |
193 | frame chain to not bother trying to unwind past this frame. */ | |
194 | ||
52e4073c MA |
195 | static CORE_ADDR |
196 | mn10300_analyze_prologue (fi, pc) | |
197 | struct frame_info *fi; | |
198 | CORE_ADDR pc; | |
ddc2888e | 199 | { |
52e4073c MA |
200 | CORE_ADDR func_addr, func_end, addr, stop; |
201 | CORE_ADDR stack_size; | |
202 | int imm_size; | |
203 | unsigned char buf[4]; | |
11ac7952 | 204 | int status, movm_args = 0; |
52e4073c MA |
205 | char *name; |
206 | ||
207 | /* Use the PC in the frame if it's provided to look up the | |
208 | start of this function. */ | |
209 | pc = (fi ? fi->pc : pc); | |
210 | ||
211 | /* Find the start of this function. */ | |
212 | status = find_pc_partial_function (pc, &name, &func_addr, &func_end); | |
213 | ||
214 | /* Do nothing if we couldn't find the start of this function or if we're | |
215 | stopped at the first instruction in the prologue. */ | |
216 | if (status == 0) | |
217 | return pc; | |
218 | ||
219 | /* If we're in start, then give up. */ | |
220 | if (strcmp (name, "start") == 0) | |
221 | { | |
98760eab AC |
222 | if (fi != NULL) |
223 | fi->status = NO_MORE_FRAMES; | |
52e4073c MA |
224 | return pc; |
225 | } | |
226 | ||
227 | /* At the start of a function our frame is in the stack pointer. */ | |
228 | if (fi) | |
229 | fi->status = MY_FRAME_IN_SP; | |
3de76938 | 230 | |
52e4073c MA |
231 | /* Get the next two bytes into buf, we need two because rets is a two |
232 | byte insn and the first isn't enough to uniquely identify it. */ | |
233 | status = read_memory_nobpt (pc, buf, 2); | |
234 | if (status != 0) | |
235 | return pc; | |
3de76938 | 236 | |
52e4073c MA |
237 | /* If we're physically on an "rets" instruction, then our frame has |
238 | already been deallocated. Note this can also be true for retf | |
239 | and ret if they specify a size of zero. | |
3de76938 | 240 | |
52e4073c MA |
241 | In this case fi->frame is bogus, we need to fix it. */ |
242 | if (fi && buf[0] == 0xf0 && buf[1] == 0xfc) | |
243 | { | |
244 | if (fi->next == NULL) | |
245 | fi->frame = read_sp (); | |
246 | return fi->pc; | |
247 | } | |
248 | ||
249 | /* Similarly if we're stopped on the first insn of a prologue as our | |
250 | frame hasn't been allocated yet. */ | |
251 | if (fi && fi->pc == func_addr) | |
252 | { | |
253 | if (fi->next == NULL) | |
254 | fi->frame = read_sp (); | |
255 | return fi->pc; | |
256 | } | |
3de76938 | 257 | |
52e4073c MA |
258 | /* Figure out where to stop scanning. */ |
259 | stop = fi ? fi->pc : func_end; | |
3de76938 | 260 | |
52e4073c MA |
261 | /* Don't walk off the end of the function. */ |
262 | stop = stop > func_end ? func_end : stop; | |
3de76938 | 263 | |
52e4073c MA |
264 | /* Start scanning on the first instruction of this function. */ |
265 | addr = func_addr; | |
3de76938 | 266 | |
52e4073c MA |
267 | /* Suck in two bytes. */ |
268 | status = read_memory_nobpt (addr, buf, 2); | |
269 | if (status != 0) | |
3de76938 | 270 | { |
11ac7952 | 271 | fix_frame_pointer (fi, 0); |
52e4073c | 272 | return addr; |
3de76938 GN |
273 | } |
274 | ||
52e4073c MA |
275 | /* First see if this insn sets the stack pointer; if so, it's something |
276 | we won't understand, so quit now. */ | |
277 | if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0) | |
95efddf2 | 278 | { |
52e4073c MA |
279 | if (fi) |
280 | fi->status = NO_MORE_FRAMES; | |
281 | return addr; | |
282 | } | |
283 | ||
284 | /* Now look for movm [regs],sp, which saves the callee saved registers. | |
285 | ||
286 | At this time we don't know if fi->frame is valid, so we only note | |
287 | that we encountered a movm instruction. Later, we'll set the entries | |
288 | in fsr.regs as needed. */ | |
289 | if (buf[0] == 0xcf) | |
290 | { | |
11ac7952 MA |
291 | /* Extract the register list for the movm instruction. */ |
292 | status = read_memory_nobpt (addr + 1, buf, 1); | |
293 | movm_args = *buf; | |
294 | ||
52e4073c MA |
295 | addr += 2; |
296 | ||
297 | /* Quit now if we're beyond the stop point. */ | |
298 | if (addr >= stop) | |
299 | { | |
300 | /* Fix fi->frame since it's bogus at this point. */ | |
301 | if (fi && fi->next == NULL) | |
302 | fi->frame = read_sp (); | |
303 | ||
304 | /* Note if/where callee saved registers were saved. */ | |
11ac7952 | 305 | set_movm_offsets (fi, movm_args); |
52e4073c MA |
306 | return addr; |
307 | } | |
308 | ||
309 | /* Get the next two bytes so the prologue scan can continue. */ | |
310 | status = read_memory_nobpt (addr, buf, 2); | |
311 | if (status != 0) | |
312 | { | |
313 | /* Fix fi->frame since it's bogus at this point. */ | |
314 | if (fi && fi->next == NULL) | |
315 | fi->frame = read_sp (); | |
316 | ||
317 | /* Note if/where callee saved registers were saved. */ | |
11ac7952 | 318 | set_movm_offsets (fi, movm_args); |
52e4073c MA |
319 | return addr; |
320 | } | |
321 | } | |
322 | ||
323 | /* Now see if we set up a frame pointer via "mov sp,a3" */ | |
324 | if (buf[0] == 0x3f) | |
325 | { | |
326 | addr += 1; | |
327 | ||
328 | /* The frame pointer is now valid. */ | |
329 | if (fi) | |
330 | { | |
331 | fi->status |= MY_FRAME_IN_FP; | |
332 | fi->status &= ~MY_FRAME_IN_SP; | |
333 | } | |
334 | ||
335 | /* Quit now if we're beyond the stop point. */ | |
336 | if (addr >= stop) | |
337 | { | |
11ac7952 MA |
338 | /* Fix fi->frame if it's bogus at this point. */ |
339 | fix_frame_pointer (fi, 0); | |
340 | ||
52e4073c | 341 | /* Note if/where callee saved registers were saved. */ |
11ac7952 | 342 | set_movm_offsets (fi, movm_args); |
52e4073c MA |
343 | return addr; |
344 | } | |
345 | ||
346 | /* Get two more bytes so scanning can continue. */ | |
347 | status = read_memory_nobpt (addr, buf, 2); | |
348 | if (status != 0) | |
349 | { | |
11ac7952 MA |
350 | /* Fix fi->frame if it's bogus at this point. */ |
351 | fix_frame_pointer (fi, 0); | |
352 | ||
52e4073c | 353 | /* Note if/where callee saved registers were saved. */ |
11ac7952 | 354 | set_movm_offsets (fi, movm_args); |
52e4073c MA |
355 | return addr; |
356 | } | |
357 | } | |
358 | ||
359 | /* Next we should allocate the local frame. No more prologue insns | |
360 | are found after allocating the local frame. | |
361 | ||
362 | Search for add imm8,sp (0xf8feXX) | |
363 | or add imm16,sp (0xfafeXXXX) | |
364 | or add imm32,sp (0xfcfeXXXXXXXX). | |
365 | ||
366 | If none of the above was found, then this prologue has no | |
367 | additional stack. */ | |
368 | ||
369 | status = read_memory_nobpt (addr, buf, 2); | |
370 | if (status != 0) | |
371 | { | |
372 | /* Fix fi->frame if it's bogus at this point. */ | |
11ac7952 | 373 | fix_frame_pointer (fi, 0); |
52e4073c MA |
374 | |
375 | /* Note if/where callee saved registers were saved. */ | |
11ac7952 | 376 | set_movm_offsets (fi, movm_args); |
52e4073c MA |
377 | return addr; |
378 | } | |
379 | ||
380 | imm_size = 0; | |
381 | if (buf[0] == 0xf8 && buf[1] == 0xfe) | |
382 | imm_size = 1; | |
383 | else if (buf[0] == 0xfa && buf[1] == 0xfe) | |
384 | imm_size = 2; | |
385 | else if (buf[0] == 0xfc && buf[1] == 0xfe) | |
386 | imm_size = 4; | |
387 | ||
388 | if (imm_size != 0) | |
389 | { | |
390 | /* Suck in imm_size more bytes, they'll hold the size of the | |
391 | current frame. */ | |
392 | status = read_memory_nobpt (addr + 2, buf, imm_size); | |
393 | if (status != 0) | |
394 | { | |
395 | /* Fix fi->frame if it's bogus at this point. */ | |
11ac7952 | 396 | fix_frame_pointer (fi, 0); |
52e4073c MA |
397 | |
398 | /* Note if/where callee saved registers were saved. */ | |
11ac7952 | 399 | set_movm_offsets (fi, movm_args); |
52e4073c MA |
400 | return addr; |
401 | } | |
402 | ||
403 | /* Note the size of the stack in the frame info structure. */ | |
404 | stack_size = extract_signed_integer (buf, imm_size); | |
405 | if (fi) | |
406 | fi->stack_size = stack_size; | |
407 | ||
408 | /* We just consumed 2 + imm_size bytes. */ | |
409 | addr += 2 + imm_size; | |
410 | ||
411 | /* No more prologue insns follow, so begin preparation to return. */ | |
412 | /* Fix fi->frame if it's bogus at this point. */ | |
11ac7952 | 413 | fix_frame_pointer (fi, stack_size); |
52e4073c MA |
414 | |
415 | /* Note if/where callee saved registers were saved. */ | |
11ac7952 | 416 | set_movm_offsets (fi, movm_args); |
52e4073c | 417 | return addr; |
95efddf2 | 418 | } |
3de76938 | 419 | |
52e4073c MA |
420 | /* We never found an insn which allocates local stack space, regardless |
421 | this is the end of the prologue. */ | |
422 | /* Fix fi->frame if it's bogus at this point. */ | |
11ac7952 | 423 | fix_frame_pointer (fi, 0); |
52e4073c MA |
424 | |
425 | /* Note if/where callee saved registers were saved. */ | |
11ac7952 | 426 | set_movm_offsets (fi, movm_args); |
52e4073c | 427 | return addr; |
ddc2888e | 428 | } |
52e4073c MA |
429 | |
430 | /* Function: frame_chain | |
431 | Figure out and return the caller's frame pointer given current | |
432 | frame_info struct. | |
ddc2888e | 433 | |
52e4073c MA |
434 | We don't handle dummy frames yet but we would probably just return the |
435 | stack pointer that was in use at the time the function call was made? */ | |
3de76938 | 436 | |
ddc2888e | 437 | CORE_ADDR |
52e4073c | 438 | mn10300_frame_chain (fi) |
ddc2888e | 439 | struct frame_info *fi; |
ddc2888e | 440 | { |
52e4073c | 441 | struct frame_info dummy_frame; |
3de76938 | 442 | |
52e4073c MA |
443 | /* Walk through the prologue to determine the stack size, |
444 | location of saved registers, end of the prologue, etc. */ | |
445 | if (fi->status == 0) | |
446 | mn10300_analyze_prologue (fi, (CORE_ADDR)0); | |
3de76938 | 447 | |
52e4073c MA |
448 | /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */ |
449 | if (fi->status & NO_MORE_FRAMES) | |
450 | return 0; | |
ddc2888e | 451 | |
52e4073c MA |
452 | /* Now that we've analyzed our prologue, determine the frame |
453 | pointer for our caller. | |
3de76938 | 454 | |
52e4073c MA |
455 | If our caller has a frame pointer, then we need to |
456 | find the entry value of $a3 to our function. | |
3de76938 | 457 | |
11ac7952 MA |
458 | If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory |
459 | location pointed to by fsr.regs[A3_REGNUM]. | |
3de76938 | 460 | |
52e4073c | 461 | Else it's still in $a3. |
3de76938 | 462 | |
52e4073c MA |
463 | If our caller does not have a frame pointer, then his |
464 | frame base is fi->frame + -caller's stack size. */ | |
465 | ||
466 | /* The easiest way to get that info is to analyze our caller's frame. | |
3de76938 | 467 | |
52e4073c MA |
468 | So we set up a dummy frame and call mn10300_analyze_prologue to |
469 | find stuff for us. */ | |
470 | dummy_frame.pc = FRAME_SAVED_PC (fi); | |
471 | dummy_frame.frame = fi->frame; | |
472 | memset (dummy_frame.fsr.regs, '\000', sizeof dummy_frame.fsr.regs); | |
473 | dummy_frame.status = 0; | |
474 | dummy_frame.stack_size = 0; | |
11ac7952 | 475 | mn10300_analyze_prologue (&dummy_frame, 0); |
3de76938 | 476 | |
52e4073c MA |
477 | if (dummy_frame.status & MY_FRAME_IN_FP) |
478 | { | |
479 | /* Our caller has a frame pointer. So find the frame in $a3 or | |
480 | in the stack. */ | |
11ac7952 MA |
481 | if (fi->fsr.regs[A3_REGNUM]) |
482 | return (read_memory_integer (fi->fsr.regs[A3_REGNUM], REGISTER_SIZE)); | |
3de76938 | 483 | else |
11ac7952 | 484 | return read_register (A3_REGNUM); |
52e4073c MA |
485 | } |
486 | else | |
487 | { | |
488 | int adjust = 0; | |
489 | ||
11ac7952 MA |
490 | adjust += (fi->fsr.regs[D2_REGNUM] ? 4 : 0); |
491 | adjust += (fi->fsr.regs[D3_REGNUM] ? 4 : 0); | |
492 | adjust += (fi->fsr.regs[A2_REGNUM] ? 4 : 0); | |
493 | adjust += (fi->fsr.regs[A3_REGNUM] ? 4 : 0); | |
b5b59a3c | 494 | /* start-sanitize-am33 */ |
11ac7952 MA |
495 | if (am33_mode) |
496 | { | |
497 | adjust += (fi->fsr.regs[E0_REGNUM+5] ? 4 : 0); | |
498 | adjust += (fi->fsr.regs[E0_REGNUM+4] ? 4 : 0); | |
499 | adjust += (fi->fsr.regs[E0_REGNUM+3] ? 4 : 0); | |
500 | adjust += (fi->fsr.regs[E0_REGNUM+2] ? 4 : 0); | |
501 | } | |
b5b59a3c | 502 | /* end-sanitize-am33 */ |
52e4073c MA |
503 | |
504 | /* Our caller does not have a frame pointer. So his frame starts | |
5ef103c0 MA |
505 | at the base of our frame (fi->frame) + register save space |
506 | + <his size>. */ | |
507 | return fi->frame + adjust + -dummy_frame.stack_size; | |
3de76938 | 508 | } |
52e4073c MA |
509 | } |
510 | ||
511 | /* Function: skip_prologue | |
512 | Return the address of the first inst past the prologue of the function. */ | |
3de76938 | 513 | |
52e4073c MA |
514 | CORE_ADDR |
515 | mn10300_skip_prologue (pc) | |
516 | CORE_ADDR pc; | |
517 | { | |
518 | /* We used to check the debug symbols, but that can lose if | |
519 | we have a null prologue. */ | |
520 | return mn10300_analyze_prologue (NULL, pc); | |
ddc2888e GN |
521 | } |
522 | ||
52e4073c | 523 | |
ddc2888e GN |
524 | /* Function: pop_frame |
525 | This routine gets called when either the user uses the `return' | |
526 | command, or the call dummy breakpoint gets hit. */ | |
527 | ||
528 | void | |
529 | mn10300_pop_frame (frame) | |
530 | struct frame_info *frame; | |
531 | { | |
3de76938 GN |
532 | int regnum; |
533 | ||
3de76938 GN |
534 | if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame)) |
535 | generic_pop_dummy_frame (); | |
536 | else | |
537 | { | |
538 | write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); | |
539 | ||
52e4073c | 540 | /* Restore any saved registers. */ |
3de76938 GN |
541 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
542 | if (frame->fsr.regs[regnum] != 0) | |
52e4073c MA |
543 | { |
544 | ULONGEST value; | |
545 | ||
546 | value = read_memory_unsigned_integer (frame->fsr.regs[regnum], | |
547 | REGISTER_RAW_SIZE (regnum)); | |
548 | write_register (regnum, value); | |
549 | } | |
3de76938 | 550 | |
52e4073c | 551 | /* Actually cut back the stack. */ |
3de76938 | 552 | write_register (SP_REGNUM, FRAME_FP (frame)); |
52e4073c MA |
553 | |
554 | /* Don't we need to set the PC?!? XXX FIXME. */ | |
3de76938 GN |
555 | } |
556 | ||
52e4073c | 557 | /* Throw away any cached frame information. */ |
3de76938 | 558 | flush_cached_frames (); |
ddc2888e GN |
559 | } |
560 | ||
3de76938 GN |
561 | /* Function: push_arguments |
562 | Setup arguments for a call to the target. Arguments go in | |
52e4073c | 563 | order on the stack. */ |
3de76938 | 564 | |
ddc2888e GN |
565 | CORE_ADDR |
566 | mn10300_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
567 | int nargs; | |
568 | value_ptr *args; | |
569 | CORE_ADDR sp; | |
570 | unsigned char struct_return; | |
571 | CORE_ADDR struct_addr; | |
572 | { | |
3de76938 GN |
573 | int argnum = 0; |
574 | int len = 0; | |
52e4073c MA |
575 | int stack_offset = 0; |
576 | int regsused = struct_return ? 1 : 0; | |
3de76938 | 577 | |
52e4073c MA |
578 | /* This should be a nop, but align the stack just in case something |
579 | went wrong. Stacks are four byte aligned on the mn10300. */ | |
3de76938 GN |
580 | sp &= ~3; |
581 | ||
52e4073c MA |
582 | /* Now make space on the stack for the args. |
583 | ||
584 | XXX This doesn't appear to handle pass-by-invisible reference | |
585 | arguments. */ | |
3de76938 | 586 | for (argnum = 0; argnum < nargs; argnum++) |
52e4073c MA |
587 | { |
588 | int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3; | |
589 | ||
590 | while (regsused < 2 && arg_length > 0) | |
591 | { | |
592 | regsused++; | |
593 | arg_length -= 4; | |
594 | } | |
595 | len += arg_length; | |
596 | } | |
3de76938 | 597 | |
52e4073c | 598 | /* Allocate stack space. */ |
3de76938 GN |
599 | sp -= len; |
600 | ||
52e4073c | 601 | regsused = struct_return ? 1 : 0; |
3de76938 GN |
602 | /* Push all arguments onto the stack. */ |
603 | for (argnum = 0; argnum < nargs; argnum++) | |
604 | { | |
605 | int len; | |
606 | char *val; | |
607 | ||
52e4073c | 608 | /* XXX Check this. What about UNIONS? */ |
3de76938 GN |
609 | if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT |
610 | && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) | |
611 | { | |
52e4073c | 612 | /* XXX Wrong, we want a pointer to this argument. */ |
3de76938 GN |
613 | len = TYPE_LENGTH (VALUE_TYPE (*args)); |
614 | val = (char *)VALUE_CONTENTS (*args); | |
615 | } | |
616 | else | |
617 | { | |
618 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
619 | val = (char *)VALUE_CONTENTS (*args); | |
620 | } | |
621 | ||
52e4073c MA |
622 | while (regsused < 2 && len > 0) |
623 | { | |
624 | write_register (regsused, extract_unsigned_integer (val, 4)); | |
625 | val += 4; | |
626 | len -= 4; | |
627 | regsused++; | |
628 | } | |
629 | ||
3de76938 GN |
630 | while (len > 0) |
631 | { | |
632 | write_memory (sp + stack_offset, val, 4); | |
3de76938 GN |
633 | len -= 4; |
634 | val += 4; | |
635 | stack_offset += 4; | |
636 | } | |
52e4073c | 637 | |
3de76938 GN |
638 | args++; |
639 | } | |
640 | ||
52e4073c MA |
641 | /* Make space for the flushback area. */ |
642 | sp -= 8; | |
3de76938 | 643 | return sp; |
ddc2888e GN |
644 | } |
645 | ||
3de76938 GN |
646 | /* Function: push_return_address (pc) |
647 | Set up the return address for the inferior function call. | |
648 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
649 | ||
ddc2888e GN |
650 | CORE_ADDR |
651 | mn10300_push_return_address (pc, sp) | |
652 | CORE_ADDR pc; | |
653 | CORE_ADDR sp; | |
654 | { | |
52e4073c MA |
655 | unsigned char buf[4]; |
656 | ||
657 | store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ()); | |
658 | write_memory (sp - 4, buf, 4); | |
659 | return sp - 4; | |
660 | } | |
3de76938 | 661 | |
52e4073c MA |
662 | /* Function: store_struct_return (addr,sp) |
663 | Store the structure value return address for an inferior function | |
664 | call. */ | |
665 | ||
666 | CORE_ADDR | |
667 | mn10300_store_struct_return (addr, sp) | |
668 | CORE_ADDR addr; | |
669 | CORE_ADDR sp; | |
670 | { | |
671 | /* The structure return address is passed as the first argument. */ | |
672 | write_register (0, addr); | |
3de76938 | 673 | return sp; |
ddc2888e GN |
674 | } |
675 | ||
3de76938 GN |
676 | /* Function: frame_saved_pc |
677 | Find the caller of this frame. We do this by seeing if RP_REGNUM | |
678 | is saved in the stack anywhere, otherwise we get it from the | |
679 | registers. If the inner frame is a dummy frame, return its PC | |
680 | instead of RP, because that's where "caller" of the dummy-frame | |
681 | will be found. */ | |
682 | ||
ddc2888e GN |
683 | CORE_ADDR |
684 | mn10300_frame_saved_pc (fi) | |
685 | struct frame_info *fi; | |
686 | { | |
52e4073c MA |
687 | int adjust = 0; |
688 | ||
11ac7952 MA |
689 | adjust += (fi->fsr.regs[D2_REGNUM] ? 4 : 0); |
690 | adjust += (fi->fsr.regs[D3_REGNUM] ? 4 : 0); | |
691 | adjust += (fi->fsr.regs[A2_REGNUM] ? 4 : 0); | |
692 | adjust += (fi->fsr.regs[A3_REGNUM] ? 4 : 0); | |
b5b59a3c | 693 | /* start-sanitize-am33 */ |
11ac7952 MA |
694 | if (am33_mode) |
695 | { | |
696 | adjust += (fi->fsr.regs[E0_REGNUM+5] ? 4 : 0); | |
697 | adjust += (fi->fsr.regs[E0_REGNUM+4] ? 4 : 0); | |
698 | adjust += (fi->fsr.regs[E0_REGNUM+3] ? 4 : 0); | |
699 | adjust += (fi->fsr.regs[E0_REGNUM+2] ? 4 : 0); | |
700 | } | |
b5b59a3c | 701 | /* end-sanitize-am33 */ |
3de76938 | 702 | |
52e4073c | 703 | return (read_memory_integer (fi->frame + adjust, REGISTER_SIZE)); |
ddc2888e GN |
704 | } |
705 | ||
706 | void | |
707 | get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) | |
708 | char *raw_buffer; | |
709 | int *optimized; | |
710 | CORE_ADDR *addrp; | |
711 | struct frame_info *frame; | |
712 | int regnum; | |
713 | enum lval_type *lval; | |
714 | { | |
715 | generic_get_saved_register (raw_buffer, optimized, addrp, | |
716 | frame, regnum, lval); | |
717 | } | |
718 | ||
95efddf2 GN |
719 | /* Function: init_extra_frame_info |
720 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
52e4073c | 721 | registers. Most of the work is done in mn10300_analyze_prologue(). |
3de76938 | 722 | |
95efddf2 GN |
723 | Note that when we are called for the last frame (currently active frame), |
724 | that fi->pc and fi->frame will already be setup. However, fi->frame will | |
725 | be valid only if this routine uses FP. For previous frames, fi-frame will | |
52e4073c MA |
726 | always be correct. mn10300_analyze_prologue will fix fi->frame if |
727 | it's not valid. | |
95efddf2 GN |
728 | |
729 | We can be called with the PC in the call dummy under two circumstances. | |
730 | First, during normal backtracing, second, while figuring out the frame | |
52e4073c | 731 | pointer just prior to calling the target function (see run_stack_dummy). */ |
95efddf2 GN |
732 | |
733 | void | |
734 | mn10300_init_extra_frame_info (fi) | |
735 | struct frame_info *fi; | |
ddc2888e | 736 | { |
95efddf2 GN |
737 | if (fi->next) |
738 | fi->pc = FRAME_SAVED_PC (fi->next); | |
3de76938 | 739 | |
95efddf2 | 740 | memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs); |
52e4073c MA |
741 | fi->status = 0; |
742 | fi->stack_size = 0; | |
3de76938 | 743 | |
52e4073c MA |
744 | mn10300_analyze_prologue (fi, 0); |
745 | } | |
3de76938 | 746 | |
9ddf9aa9 AC |
747 | /* Function: mn10300_virtual_frame_pointer |
748 | Return the register that the function uses for a frame pointer, | |
749 | plus any necessary offset to be applied to the register before | |
750 | any frame pointer offsets. */ | |
751 | ||
752 | void | |
753 | mn10300_virtual_frame_pointer (pc, reg, offset) | |
754 | CORE_ADDR pc; | |
755 | long *reg; | |
756 | long *offset; | |
757 | { | |
758 | struct frame_info fi; | |
759 | ||
760 | /* Set up a dummy frame_info. */ | |
761 | fi.next = NULL; | |
762 | fi.prev = NULL; | |
763 | fi.frame = 0; | |
764 | fi.pc = pc; | |
765 | ||
766 | /* Analyze the prolog and fill in the extra info. */ | |
767 | mn10300_init_extra_frame_info (&fi); | |
768 | ||
769 | /* Results will tell us which type of frame it uses. */ | |
770 | if (fi.status & MY_FRAME_IN_SP) | |
771 | { | |
772 | *reg = SP_REGNUM; | |
773 | *offset = -(fi.stack_size); | |
774 | } | |
775 | else | |
776 | { | |
777 | *reg = A3_REGNUM; | |
778 | *offset = 0; | |
779 | } | |
780 | } | |
781 | ||
52e4073c MA |
782 | /* This can be made more generic later. */ |
783 | static void | |
784 | set_machine_hook (filename) | |
785 | char *filename; | |
786 | { | |
787 | int i; | |
3de76938 | 788 | |
52e4073c MA |
789 | if (bfd_get_mach (exec_bfd) == bfd_mach_mn10300 |
790 | || bfd_get_mach (exec_bfd) == 0) | |
95efddf2 | 791 | { |
9ddf9aa9 | 792 | mn10300_register_names = mn10300_generic_register_names; |
52e4073c | 793 | } |
95efddf2 | 794 | |
52e4073c | 795 | /* start-sanitize-am33 */ |
11ac7952 | 796 | am33_mode = 0; |
52e4073c MA |
797 | if (bfd_get_mach (exec_bfd) == bfd_mach_am33) |
798 | { | |
9ddf9aa9 AC |
799 | |
800 | mn10300_register_names = am33_register_names; | |
11ac7952 | 801 | am33_mode = 1; |
95efddf2 | 802 | } |
52e4073c | 803 | /* end-sanitize-am33 */ |
ddc2888e GN |
804 | } |
805 | ||
806 | void | |
807 | _initialize_mn10300_tdep () | |
808 | { | |
95efddf2 | 809 | /* printf("_initialize_mn10300_tdep\n"); */ |
3de76938 | 810 | |
ddc2888e | 811 | tm_print_insn = print_insn_mn10300; |
52e4073c MA |
812 | |
813 | specify_exec_file_hook (set_machine_hook); | |
ddc2888e | 814 | } |
95efddf2 | 815 |