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f0bdd87d YS |
1 | /* Target-machine dependent code for Renesas H8/300, for GDB. |
2 | ||
3 | Copyright 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, | |
4 | 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | /* | |
24 | Contributed by Steve Chamberlain | |
25 | sac@cygnus.com | |
26 | */ | |
27 | ||
28 | #include "defs.h" | |
29 | #include "value.h" | |
30 | #include "inferior.h" | |
31 | #include "symfile.h" | |
32 | #include "arch-utils.h" | |
33 | #include "regcache.h" | |
34 | #include "gdbcore.h" | |
35 | #include "objfiles.h" | |
36 | #include "gdbcmd.h" | |
37 | #include "gdb_assert.h" | |
38 | #include "dis-asm.h" | |
39 | #include "dwarf2-frame.h" | |
40 | #include "frame.h" | |
41 | #include "frame-base.h" | |
42 | #include "frame-unwind.h" | |
43 | ||
44 | /* Extra info which is saved in each frame_info. */ | |
45 | struct frame_extra_info | |
46 | { | |
47 | CORE_ADDR from_pc; | |
48 | }; | |
49 | ||
50 | enum | |
51 | { | |
52 | h8300_reg_size = 2, | |
53 | h8300h_reg_size = 4, | |
54 | h8300_max_reg_size = 4, | |
55 | }; | |
56 | ||
57 | static int is_h8300hmode (struct gdbarch *gdbarch); | |
58 | static int is_h8300smode (struct gdbarch *gdbarch); | |
59 | static int is_h8300sxmode (struct gdbarch *gdbarch); | |
60 | static int is_h8300_normal_mode (struct gdbarch *gdbarch); | |
61 | ||
62 | #define BINWORD (is_h8300hmode (current_gdbarch) && \ | |
63 | !is_h8300_normal_mode (current_gdbarch) ? h8300h_reg_size : h8300_reg_size) | |
64 | ||
65 | enum gdb_regnum | |
66 | { | |
67 | E_R0_REGNUM, E_ER0_REGNUM = E_R0_REGNUM, E_ARG0_REGNUM = E_R0_REGNUM, | |
68 | E_RET0_REGNUM = E_R0_REGNUM, | |
69 | E_R1_REGNUM, E_ER1_REGNUM = E_R1_REGNUM, E_RET1_REGNUM = E_R1_REGNUM, | |
70 | E_R2_REGNUM, E_ER2_REGNUM = E_R2_REGNUM, E_ARGLAST_REGNUM = E_R2_REGNUM, | |
71 | E_R3_REGNUM, E_ER3_REGNUM = E_R3_REGNUM, | |
72 | E_R4_REGNUM, E_ER4_REGNUM = E_R4_REGNUM, | |
73 | E_R5_REGNUM, E_ER5_REGNUM = E_R5_REGNUM, | |
74 | E_R6_REGNUM, E_ER6_REGNUM = E_R6_REGNUM, E_FP_REGNUM = E_R6_REGNUM, | |
75 | E_SP_REGNUM, | |
76 | E_CCR_REGNUM, | |
77 | E_PC_REGNUM, | |
78 | E_CYCLES_REGNUM, | |
79 | E_TICK_REGNUM, E_EXR_REGNUM = E_TICK_REGNUM, | |
80 | E_INST_REGNUM, E_TICKS_REGNUM = E_INST_REGNUM, | |
81 | E_INSTS_REGNUM, | |
82 | E_MACH_REGNUM, | |
83 | E_MACL_REGNUM, | |
84 | E_SBR_REGNUM, | |
85 | E_VBR_REGNUM | |
86 | }; | |
87 | ||
88 | #define H8300_MAX_NUM_REGS 18 | |
89 | ||
90 | #define E_PSEUDO_CCR_REGNUM (NUM_REGS) | |
91 | #define E_PSEUDO_EXR_REGNUM (NUM_REGS+1) | |
92 | ||
93 | #define UNSIGNED_SHORT(X) ((X) & 0xffff) | |
94 | ||
95 | #define IS_PUSH(x) ((x & 0xfff0)==0x6df0) | |
96 | #define IS_PUSH_FP(x) (x == 0x6df6) | |
97 | #define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6) | |
98 | #define IS_MOV_SP_FP(x) (x == 0x0d76 || x == 0x0ff6) | |
99 | #define IS_SUB2_SP(x) (x==0x1b87) | |
100 | #define IS_SUB4_SP(x) (x==0x1b97) | |
101 | #define IS_SUBL_SP(x) (x==0x7a37) | |
102 | #define IS_MOVK_R5(x) (x==0x7905) | |
103 | #define IS_SUB_R5SP(x) (x==0x1957) | |
104 | ||
105 | /* If the instruction at PC is an argument register spill, return its | |
106 | length. Otherwise, return zero. | |
107 | ||
108 | An argument register spill is an instruction that moves an argument | |
109 | from the register in which it was passed to the stack slot in which | |
110 | it really lives. It is a byte, word, or longword move from an | |
111 | argument register to a negative offset from the frame pointer. | |
112 | ||
113 | CV, 2003-06-16: Or, in optimized code or when the `register' qualifier | |
114 | is used, it could be a byte, word or long move to registers r3-r5. */ | |
115 | ||
116 | static int | |
117 | h8300_is_argument_spill (CORE_ADDR pc) | |
118 | { | |
119 | int w = read_memory_unsigned_integer (pc, 2); | |
120 | ||
121 | if (((w & 0xff88) == 0x0c88 /* mov.b Rsl, Rdl */ | |
122 | || (w & 0xff88) == 0x0d00 /* mov.w Rs, Rd */ | |
123 | || (w & 0xff88) == 0x0f80) /* mov.l Rs, Rd */ | |
124 | && (w & 0x70) <= 0x20 /* Rs is R0, R1 or R2 */ | |
125 | && (w & 0x7) >= 0x3 && (w & 0x7) <= 0x5) /* Rd is R3, R4 or R5 */ | |
126 | return 2; | |
127 | ||
128 | if ((w & 0xfff0) == 0x6ee0 /* mov.b Rs,@(d:16,er6) */ | |
129 | && 8 <= (w & 0xf) && (w & 0xf) <= 10) /* Rs is R0L, R1L, or R2L */ | |
130 | { | |
131 | int w2 = read_memory_integer (pc + 2, 2); | |
132 | ||
133 | /* ... and d:16 is negative. */ | |
134 | if (w2 < 0) | |
135 | return 4; | |
136 | } | |
137 | else if (w == 0x7860) | |
138 | { | |
139 | int w2 = read_memory_integer (pc + 2, 2); | |
140 | ||
141 | if ((w2 & 0xfff0) == 0x6aa0) /* mov.b Rs, @(d:24,er6) */ | |
142 | { | |
143 | LONGEST disp = read_memory_integer (pc + 4, 4); | |
144 | ||
145 | /* ... and d:24 is negative. */ | |
146 | if (disp < 0 && disp > 0xffffff) | |
147 | return 8; | |
148 | } | |
149 | } | |
150 | else if ((w & 0xfff0) == 0x6fe0 /* mov.w Rs,@(d:16,er6) */ | |
151 | && (w & 0xf) <= 2) /* Rs is R0, R1, or R2 */ | |
152 | { | |
153 | int w2 = read_memory_integer (pc + 2, 2); | |
154 | ||
155 | /* ... and d:16 is negative. */ | |
156 | if (w2 < 0) | |
157 | return 4; | |
158 | } | |
159 | else if (w == 0x78e0) | |
160 | { | |
161 | int w2 = read_memory_integer (pc + 2, 2); | |
162 | ||
163 | if ((w2 & 0xfff0) == 0x6ba0) /* mov.b Rs, @(d:24,er6) */ | |
164 | { | |
165 | LONGEST disp = read_memory_integer (pc + 4, 4); | |
166 | ||
167 | /* ... and d:24 is negative. */ | |
168 | if (disp < 0 && disp > 0xffffff) | |
169 | return 8; | |
170 | } | |
171 | } | |
172 | else if (w == 0x0100) | |
173 | { | |
174 | int w2 = read_memory_integer (pc + 2, 2); | |
175 | ||
176 | if ((w2 & 0xfff0) == 0x6fe0 /* mov.l Rs,@(d:16,er6) */ | |
177 | && (w2 & 0xf) <= 2) /* Rs is ER0, ER1, or ER2 */ | |
178 | { | |
179 | int w3 = read_memory_integer (pc + 4, 2); | |
180 | ||
181 | /* ... and d:16 is negative. */ | |
182 | if (w3 < 0) | |
183 | return 6; | |
184 | } | |
185 | else if (w2 == 0x78e0) | |
186 | { | |
187 | int w3 = read_memory_integer (pc + 4, 2); | |
188 | ||
189 | if ((w3 & 0xfff0) == 0x6ba0) /* mov.l Rs, @(d:24,er6) */ | |
190 | { | |
191 | LONGEST disp = read_memory_integer (pc + 6, 4); | |
192 | ||
193 | /* ... and d:24 is negative. */ | |
194 | if (disp < 0 && disp > 0xffffff) | |
195 | return 10; | |
196 | } | |
197 | } | |
198 | } | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static CORE_ADDR | |
204 | h8300_skip_prologue (CORE_ADDR start_pc) | |
205 | { | |
206 | short int w; | |
207 | int adjust = 0; | |
208 | ||
209 | /* Skip past all push and stm insns. */ | |
210 | while (1) | |
211 | { | |
212 | w = read_memory_unsigned_integer (start_pc, 2); | |
213 | /* First look for push insns. */ | |
214 | if (w == 0x0100 || w == 0x0110 || w == 0x0120 || w == 0x0130) | |
215 | { | |
216 | w = read_memory_unsigned_integer (start_pc + 2, 2); | |
217 | adjust = 2; | |
218 | } | |
219 | ||
220 | if (IS_PUSH (w)) | |
221 | { | |
222 | start_pc += 2 + adjust; | |
223 | w = read_memory_unsigned_integer (start_pc, 2); | |
224 | continue; | |
225 | } | |
226 | adjust = 0; | |
227 | break; | |
228 | } | |
229 | ||
230 | /* Skip past a move to FP, either word or long sized */ | |
231 | w = read_memory_unsigned_integer (start_pc, 2); | |
232 | if (w == 0x0100) | |
233 | { | |
234 | w = read_memory_unsigned_integer (start_pc + 2, 2); | |
235 | adjust += 2; | |
236 | } | |
237 | ||
238 | if (IS_MOVE_FP (w)) | |
239 | { | |
240 | start_pc += 2 + adjust; | |
241 | w = read_memory_unsigned_integer (start_pc, 2); | |
242 | } | |
243 | ||
244 | /* Check for loading either a word constant into r5; | |
245 | long versions are handled by the SUBL_SP below. */ | |
246 | if (IS_MOVK_R5 (w)) | |
247 | { | |
248 | start_pc += 2; | |
249 | w = read_memory_unsigned_integer (start_pc, 2); | |
250 | } | |
251 | ||
252 | /* Now check for subtracting r5 from sp, word sized only. */ | |
253 | if (IS_SUB_R5SP (w)) | |
254 | { | |
255 | start_pc += 2 + adjust; | |
256 | w = read_memory_unsigned_integer (start_pc, 2); | |
257 | } | |
258 | ||
259 | /* Check for subs #2 and subs #4. */ | |
260 | while (IS_SUB2_SP (w) || IS_SUB4_SP (w)) | |
261 | { | |
262 | start_pc += 2 + adjust; | |
263 | w = read_memory_unsigned_integer (start_pc, 2); | |
264 | } | |
265 | ||
266 | /* Check for a 32bit subtract. */ | |
267 | if (IS_SUBL_SP (w)) | |
268 | start_pc += 6 + adjust; | |
269 | ||
270 | /* Skip past another possible stm insn for registers R3 to R5 (possibly used | |
271 | for register qualified arguments. */ | |
272 | w = read_memory_unsigned_integer (start_pc, 2); | |
273 | /* First look for push insns. */ | |
274 | if (w == 0x0110 || w == 0x0120 || w == 0x0130) | |
275 | { | |
276 | w = read_memory_unsigned_integer (start_pc + 2, 2); | |
277 | if (IS_PUSH (w) && (w & 0xf) >= 0x3 && (w & 0xf) <= 0x5) | |
278 | start_pc += 4; | |
279 | } | |
280 | ||
281 | /* Check for spilling an argument register to the stack frame. | |
282 | This could also be an initializing store from non-prologue code, | |
283 | but I don't think there's any harm in skipping that. */ | |
284 | for (;;) | |
285 | { | |
286 | int spill_size = h8300_is_argument_spill (start_pc); | |
287 | if (spill_size == 0) | |
288 | break; | |
289 | start_pc += spill_size; | |
290 | } | |
291 | ||
292 | return start_pc; | |
293 | } | |
294 | ||
295 | static CORE_ADDR | |
296 | h8300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
297 | { | |
298 | char buf[8]; | |
299 | ||
300 | frame_unwind_register (next_frame, E_PC_REGNUM, buf); | |
301 | return extract_typed_address (buf, builtin_type_void_func_ptr); | |
302 | } | |
303 | ||
304 | static struct frame_id | |
305 | h8300_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
306 | { | |
307 | char buf[4]; | |
308 | CORE_ADDR fp; | |
309 | ||
310 | frame_unwind_register (next_frame, E_FP_REGNUM, buf); | |
311 | fp = extract_unsigned_integer (buf, 4); | |
312 | ||
313 | return frame_id_build (fp, frame_pc_unwind (next_frame)); | |
314 | } | |
315 | ||
316 | struct h8300_frame_cache | |
317 | { | |
318 | /* Base address. */ | |
319 | CORE_ADDR base; | |
320 | CORE_ADDR sp_offset; | |
321 | CORE_ADDR pc; | |
322 | ||
323 | /* Saved registers. */ | |
324 | CORE_ADDR saved_regs[H8300_MAX_NUM_REGS]; | |
325 | CORE_ADDR saved_sp; | |
326 | ||
327 | /* Stack space reserved for local variables. */ | |
328 | long locals; | |
329 | }; | |
330 | ||
331 | /* Normal frames. */ | |
332 | ||
333 | /* Allocate and initialize a frame cache. */ | |
334 | ||
335 | static struct h8300_frame_cache * | |
336 | h8300_alloc_frame_cache (void) | |
337 | { | |
338 | struct h8300_frame_cache *cache; | |
339 | int i; | |
340 | ||
341 | cache = FRAME_OBSTACK_ZALLOC (struct h8300_frame_cache); | |
342 | ||
343 | /* Base address. */ | |
344 | cache->base = 0; | |
345 | cache->sp_offset = -4; | |
346 | cache->pc = 0; | |
347 | ||
348 | /* Saved registers. We initialize these to -1 since zero is a valid | |
349 | offset (that's where %fp is supposed to be stored). */ | |
350 | for (i = 0; i < NUM_REGS; i++) | |
351 | cache->saved_regs[i] = -1; | |
352 | ||
353 | /* Frameless until proven otherwise. */ | |
354 | cache->locals = -1; | |
355 | ||
356 | return cache; | |
357 | } | |
358 | ||
359 | /* Check whether PC points at a code that sets up a new stack frame. | |
360 | If so, it updates CACHE and returns the address of the first | |
361 | instruction after the sequence that sets removes the "hidden" | |
362 | argument from the stack or CURRENT_PC, whichever is smaller. | |
363 | Otherwise, return PC. */ | |
364 | ||
365 | static CORE_ADDR | |
366 | h8300_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
367 | struct h8300_frame_cache *cache) | |
368 | { | |
369 | unsigned int op; | |
370 | int subs_count; | |
371 | ||
372 | if (pc >= current_pc) | |
373 | return current_pc; | |
374 | ||
375 | op = read_memory_unsigned_integer (pc, 4); | |
376 | ||
377 | if (op == 0x6df60d76) | |
378 | { | |
379 | /* mov.w r6,@-sp; mov.w sp,r6 */ | |
380 | cache->saved_regs[E_FP_REGNUM] = 0; | |
381 | cache->sp_offset += 2; | |
382 | op = read_memory_unsigned_integer (pc + 4, 4); | |
383 | if (((op >> 16) & 0xfff0) == 0x7900) | |
384 | { | |
385 | /* mov.w #imm,rN */ | |
386 | cache->locals = -(short) (op & 0xffff); | |
387 | return pc + 8; | |
388 | } | |
389 | else if ((op >> 16) == 0x1b87) | |
390 | { | |
391 | /* subs #2,sp */ | |
392 | for (cache->locals = 0, pc += 4; | |
393 | read_memory_unsigned_integer (pc, 2) == 0x1b87; | |
394 | pc += 2, cache->locals += 2); | |
395 | return pc; | |
396 | } | |
397 | } | |
398 | else if (op == 0x01006df6) | |
399 | { | |
400 | /* mov.l er6,@-sp */ | |
401 | op = read_memory_unsigned_integer (pc + 4, 2); | |
402 | if (op == 0x0ff6) | |
403 | { | |
404 | /* mov.l sp,er6 */ | |
405 | op = read_memory_unsigned_integer (pc + 6, 2); | |
406 | if (op == 0x7a17) | |
407 | { | |
408 | /* add.l #-n,sp */ | |
409 | cache->locals = -read_memory_unsigned_integer (pc + 8, 4); | |
410 | return pc + 12; | |
411 | } | |
412 | else if (op == 0x1b97) | |
413 | { | |
414 | /* subs #4,sp */ | |
415 | for (cache->locals = 0, pc += 6; | |
416 | read_memory_unsigned_integer (pc, 2) == 0x1b97; | |
417 | pc += 2, cache->locals += 2); | |
418 | return pc; | |
419 | } | |
420 | } | |
421 | } | |
422 | ||
423 | return pc; | |
424 | } | |
425 | ||
426 | /* Check whether PC points at code that saves registers on the stack. | |
427 | If so, it updates CACHE and returns the address of the first | |
428 | instruction after the register saves or CURRENT_PC, whichever is | |
429 | smaller. Otherwise, return PC. */ | |
430 | ||
431 | static CORE_ADDR | |
432 | h8300_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, | |
433 | struct h8300_frame_cache *cache) | |
434 | { | |
435 | if (cache->locals >= 0) | |
436 | { | |
437 | CORE_ADDR offset; | |
438 | int op; | |
439 | int i, regno; | |
440 | ||
441 | offset = -cache->locals; | |
442 | while (pc < current_pc) | |
443 | { | |
444 | op = read_memory_unsigned_integer (pc, 2); | |
445 | if ((op & 0xfff0) == 0x6df0) | |
446 | { | |
447 | /* mov.w rN,@-sp */ | |
448 | regno = op & 0x000f; | |
449 | cache->saved_regs[regno] = offset; | |
450 | offset -= 2; | |
451 | pc += 2; | |
452 | } | |
453 | else if (op == 0x0100) | |
454 | { | |
455 | op = read_memory_unsigned_integer (pc + 2, 2); | |
456 | if ((op & 0xfff0) == 0x6df0) | |
457 | { | |
458 | /* mov.l erN,@-sp */ | |
459 | regno = op & 0x000f; | |
460 | cache->saved_regs[regno] = offset; | |
461 | offset -= 4; | |
462 | pc += 4; | |
463 | } | |
464 | else | |
465 | break; | |
466 | } | |
467 | else if ((op & 0xffcf) == 0x0100) | |
468 | { | |
469 | int op1; | |
470 | op1 = read_memory_unsigned_integer (pc + 2, 2); | |
471 | if ((op1 & 0xfff0) == 0x6df0) | |
472 | { | |
473 | /* stm.l reglist,@-sp */ | |
474 | i = ((op & 0x0030) >> 4) + 1; | |
475 | regno = op1 & 0x000f; | |
476 | for (; i > 0; regno++, --i) | |
477 | { | |
478 | cache->saved_regs[regno] = offset; | |
479 | offset -= 4; | |
480 | } | |
481 | pc += 4; | |
482 | } | |
483 | else | |
484 | break; | |
485 | } | |
486 | else | |
487 | break; | |
488 | } | |
489 | } | |
490 | return pc; | |
491 | } | |
492 | ||
493 | ||
494 | /* Do a full analysis of the prologue at PC and update CACHE | |
495 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
496 | address where the analysis stopped. | |
497 | ||
498 | We handle all cases that can be generated by gcc. | |
499 | ||
500 | For allocating a stack frame: | |
501 | ||
502 | mov.w r6,@-sp | |
503 | mov.w sp,r6 | |
504 | mov.w #-n,rN | |
505 | add.w rN,sp | |
506 | ||
507 | mov.w r6,@-sp | |
508 | mov.w sp,r6 | |
509 | subs #2,sp | |
510 | (repeat) | |
511 | ||
512 | mov.l er6,@-sp | |
513 | mov.l sp,er6 | |
514 | add.l #-n,sp | |
515 | ||
516 | mov.w r6,@-sp | |
517 | mov.w sp,r6 | |
518 | subs #4,sp | |
519 | (repeat) | |
520 | ||
521 | For saving registers: | |
522 | ||
523 | mov.w rN,@-sp | |
524 | mov.l erN,@-sp | |
525 | stm.l reglist,@-sp | |
526 | ||
527 | For setting up the PIC register: | |
528 | ||
529 | Future equivalence... | |
530 | ||
531 | */ | |
532 | ||
533 | static CORE_ADDR | |
534 | h8300_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, | |
535 | struct h8300_frame_cache *cache) | |
536 | { | |
537 | unsigned int op; | |
538 | ||
539 | pc = h8300_analyze_frame_setup (pc, current_pc, cache); | |
540 | pc = h8300_analyze_register_saves (pc, current_pc, cache); | |
541 | if (pc >= current_pc) | |
542 | return current_pc; | |
543 | ||
544 | /* PIC support */ | |
545 | ||
546 | return pc; | |
547 | } | |
548 | ||
549 | static struct h8300_frame_cache * | |
550 | h8300_frame_cache (struct frame_info *next_frame, void **this_cache) | |
551 | { | |
552 | struct h8300_frame_cache *cache; | |
553 | char buf[4]; | |
554 | int i; | |
555 | ||
556 | if (*this_cache) | |
557 | return *this_cache; | |
558 | ||
559 | cache = h8300_alloc_frame_cache (); | |
560 | *this_cache = cache; | |
561 | ||
562 | /* In principle, for normal frames, %fp holds the frame pointer, | |
563 | which holds the base address for the current stack frame. | |
564 | However, for functions that don't need it, the frame pointer is | |
565 | optional. For these "frameless" functions the frame pointer is | |
566 | actually the frame pointer of the calling frame. Signal | |
567 | trampolines are just a special case of a "frameless" function. | |
568 | They (usually) share their frame pointer with the frame that was | |
569 | in progress when the signal occurred. */ | |
570 | ||
571 | frame_unwind_register (next_frame, E_FP_REGNUM, buf); | |
572 | cache->base = extract_unsigned_integer (buf, 4); | |
573 | if (cache->base == 0) | |
574 | return cache; | |
575 | ||
576 | /* For normal frames, %pc is stored at 4(%fp). */ | |
577 | cache->saved_regs[E_PC_REGNUM] = 4; | |
578 | ||
579 | cache->pc = frame_func_unwind (next_frame); | |
580 | if (cache->pc != 0) | |
581 | h8300_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
582 | ||
583 | if (cache->locals < 0) | |
584 | { | |
585 | /* We didn't find a valid frame, which means that CACHE->base | |
586 | currently holds the frame pointer for our calling frame. If | |
587 | we're at the start of a function, or somewhere half-way its | |
588 | prologue, the function's frame probably hasn't been fully | |
589 | setup yet. Try to reconstruct the base address for the stack | |
590 | frame by looking at the stack pointer. For truly "frameless" | |
591 | functions this might work too. */ | |
592 | ||
593 | frame_unwind_register (next_frame, E_SP_REGNUM, buf); | |
594 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
595 | } | |
596 | ||
597 | /* Now that we have the base address for the stack frame we can | |
598 | calculate the value of %sp in the calling frame. */ | |
599 | cache->saved_sp = cache->base; | |
600 | ||
601 | /* Adjust all the saved registers such that they contain addresses | |
602 | instead of offsets. */ | |
603 | for (i = 0; i < NUM_REGS; i++) | |
604 | if (cache->saved_regs[i] != -1) | |
605 | cache->saved_regs[i] += cache->base; | |
606 | ||
607 | return cache; | |
608 | } | |
609 | ||
610 | static void | |
611 | h8300_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
612 | struct frame_id *this_id) | |
613 | { | |
614 | struct h8300_frame_cache *cache = | |
615 | h8300_frame_cache (next_frame, this_cache); | |
616 | ||
617 | /* This marks the outermost frame. */ | |
618 | if (cache->base == 0) | |
619 | return; | |
620 | ||
621 | /* See the end of m68k_push_dummy_call. */ | |
622 | *this_id = frame_id_build (cache->base, cache->pc); | |
623 | } | |
624 | ||
625 | static void | |
626 | h8300_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
627 | int regnum, int *optimizedp, | |
628 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
629 | int *realnump, void *valuep) | |
630 | { | |
631 | struct h8300_frame_cache *cache = | |
632 | h8300_frame_cache (next_frame, this_cache); | |
633 | ||
634 | gdb_assert (regnum >= 0); | |
635 | ||
636 | if (regnum == E_SP_REGNUM && cache->saved_sp) | |
637 | { | |
638 | *optimizedp = 0; | |
639 | *lvalp = not_lval; | |
640 | *addrp = 0; | |
641 | *realnump = -1; | |
642 | if (valuep) | |
643 | { | |
644 | /* Store the value. */ | |
645 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
646 | } | |
647 | return; | |
648 | } | |
649 | ||
650 | if (regnum < NUM_REGS && cache->saved_regs[regnum] != -1) | |
651 | { | |
652 | *optimizedp = 0; | |
653 | *lvalp = lval_memory; | |
654 | *addrp = cache->saved_regs[regnum]; | |
655 | *realnump = -1; | |
656 | if (valuep) | |
657 | { | |
658 | /* Read the value in from memory. */ | |
659 | read_memory (*addrp, valuep, | |
660 | register_size (current_gdbarch, regnum)); | |
661 | } | |
662 | return; | |
663 | } | |
664 | ||
665 | frame_register_unwind (next_frame, regnum, | |
666 | optimizedp, lvalp, addrp, realnump, valuep); | |
667 | } | |
668 | ||
669 | static const struct frame_unwind h8300_frame_unwind = { | |
670 | NORMAL_FRAME, | |
671 | h8300_frame_this_id, | |
672 | h8300_frame_prev_register | |
673 | }; | |
674 | ||
675 | static const struct frame_unwind * | |
676 | h8300_frame_sniffer (struct frame_info *next_frame) | |
677 | { | |
678 | return &h8300_frame_unwind; | |
679 | } | |
680 | ||
681 | /* Function: push_dummy_call | |
682 | Setup the function arguments for calling a function in the inferior. | |
683 | In this discussion, a `word' is 16 bits on the H8/300s, and 32 bits | |
684 | on the H8/300H. | |
685 | ||
686 | There are actually two ABI's here: -mquickcall (the default) and | |
687 | -mno-quickcall. With -mno-quickcall, all arguments are passed on | |
688 | the stack after the return address, word-aligned. With | |
689 | -mquickcall, GCC tries to use r0 -- r2 to pass registers. Since | |
690 | GCC doesn't indicate in the object file which ABI was used to | |
691 | compile it, GDB only supports the default --- -mquickcall. | |
692 | ||
693 | Here are the rules for -mquickcall, in detail: | |
694 | ||
695 | Each argument, whether scalar or aggregate, is padded to occupy a | |
696 | whole number of words. Arguments smaller than a word are padded at | |
697 | the most significant end; those larger than a word are padded at | |
698 | the least significant end. | |
699 | ||
700 | The initial arguments are passed in r0 -- r2. Earlier arguments go in | |
701 | lower-numbered registers. Multi-word arguments are passed in | |
702 | consecutive registers, with the most significant end in the | |
703 | lower-numbered register. | |
704 | ||
705 | If an argument doesn't fit entirely in the remaining registers, it | |
706 | is passed entirely on the stack. Stack arguments begin just after | |
707 | the return address. Once an argument has overflowed onto the stack | |
708 | this way, all subsequent arguments are passed on the stack. | |
709 | ||
710 | The above rule has odd consequences. For example, on the h8/300s, | |
711 | if a function takes two longs and an int as arguments: | |
712 | - the first long will be passed in r0/r1, | |
713 | - the second long will be passed entirely on the stack, since it | |
714 | doesn't fit in r2, | |
715 | - and the int will be passed on the stack, even though it could fit | |
716 | in r2. | |
717 | ||
718 | A weird exception: if an argument is larger than a word, but not a | |
719 | whole number of words in length (before padding), it is passed on | |
720 | the stack following the rules for stack arguments above, even if | |
721 | there are sufficient registers available to hold it. Stranger | |
722 | still, the argument registers are still `used up' --- even though | |
723 | there's nothing in them. | |
724 | ||
725 | So, for example, on the h8/300s, if a function expects a three-byte | |
726 | structure and an int, the structure will go on the stack, and the | |
727 | int will go in r2, not r0. | |
728 | ||
729 | If the function returns an aggregate type (struct, union, or class) | |
730 | by value, the caller must allocate space to hold the return value, | |
731 | and pass the callee a pointer to this space as an invisible first | |
732 | argument, in R0. | |
733 | ||
734 | For varargs functions, the last fixed argument and all the variable | |
735 | arguments are always passed on the stack. This means that calls to | |
736 | varargs functions don't work properly unless there is a prototype | |
737 | in scope. | |
738 | ||
739 | Basically, this ABI is not good, for the following reasons: | |
740 | - You can't call vararg functions properly unless a prototype is in scope. | |
741 | - Structure passing is inconsistent, to no purpose I can see. | |
742 | - It often wastes argument registers, of which there are only three | |
743 | to begin with. */ | |
744 | ||
745 | static CORE_ADDR | |
746 | h8300_push_dummy_call (struct gdbarch *gdbarch, struct value *function, | |
747 | struct regcache *regcache, CORE_ADDR bp_addr, | |
748 | int nargs, struct value **args, CORE_ADDR sp, | |
749 | int struct_return, CORE_ADDR struct_addr) | |
750 | { | |
751 | int stack_alloc = 0, stack_offset = 0; | |
752 | int wordsize = BINWORD; | |
753 | int reg = E_ARG0_REGNUM; | |
754 | int argument; | |
755 | ||
756 | /* First, make sure the stack is properly aligned. */ | |
757 | sp = align_down (sp, wordsize); | |
758 | ||
759 | /* Now make sure there's space on the stack for the arguments. We | |
760 | may over-allocate a little here, but that won't hurt anything. */ | |
761 | for (argument = 0; argument < nargs; argument++) | |
762 | stack_alloc += align_up (TYPE_LENGTH (value_type (args[argument])), | |
763 | wordsize); | |
764 | sp -= stack_alloc; | |
765 | ||
766 | /* Now load as many arguments as possible into registers, and push | |
767 | the rest onto the stack. | |
768 | If we're returning a structure by value, then we must pass a | |
769 | pointer to the buffer for the return value as an invisible first | |
770 | argument. */ | |
771 | if (struct_return) | |
772 | regcache_cooked_write_unsigned (regcache, reg++, struct_addr); | |
773 | ||
774 | for (argument = 0; argument < nargs; argument++) | |
775 | { | |
776 | struct type *type = value_type (args[argument]); | |
777 | int len = TYPE_LENGTH (type); | |
778 | char *contents = (char *) value_contents (args[argument]); | |
779 | ||
780 | /* Pad the argument appropriately. */ | |
781 | int padded_len = align_up (len, wordsize); | |
782 | char *padded = alloca (padded_len); | |
783 | ||
784 | memset (padded, 0, padded_len); | |
785 | memcpy (len < wordsize ? padded + padded_len - len : padded, | |
786 | contents, len); | |
787 | ||
788 | /* Could the argument fit in the remaining registers? */ | |
789 | if (padded_len <= (E_ARGLAST_REGNUM - reg + 1) * wordsize) | |
790 | { | |
791 | /* Are we going to pass it on the stack anyway, for no good | |
792 | reason? */ | |
793 | if (len > wordsize && len % wordsize) | |
794 | { | |
795 | /* I feel so unclean. */ | |
796 | write_memory (sp + stack_offset, padded, padded_len); | |
797 | stack_offset += padded_len; | |
798 | ||
799 | /* That's right --- even though we passed the argument | |
800 | on the stack, we consume the registers anyway! Love | |
801 | me, love my dog. */ | |
802 | reg += padded_len / wordsize; | |
803 | } | |
804 | else | |
805 | { | |
806 | /* Heavens to Betsy --- it's really going in registers! | |
807 | It would be nice if we could use write_register_bytes | |
808 | here, but on the h8/300s, there are gaps between | |
809 | the registers in the register file. */ | |
810 | int offset; | |
811 | ||
812 | for (offset = 0; offset < padded_len; offset += wordsize) | |
813 | { | |
814 | ULONGEST word = extract_unsigned_integer (padded + offset, | |
815 | wordsize); | |
816 | regcache_cooked_write_unsigned (regcache, reg++, word); | |
817 | } | |
818 | } | |
819 | } | |
820 | else | |
821 | { | |
822 | /* It doesn't fit in registers! Onto the stack it goes. */ | |
823 | write_memory (sp + stack_offset, padded, padded_len); | |
824 | stack_offset += padded_len; | |
825 | ||
826 | /* Once one argument has spilled onto the stack, all | |
827 | subsequent arguments go on the stack. */ | |
828 | reg = E_ARGLAST_REGNUM + 1; | |
829 | } | |
830 | } | |
831 | ||
832 | /* Store return address. */ | |
833 | sp -= wordsize; | |
834 | write_memory_unsigned_integer (sp, wordsize, bp_addr); | |
835 | ||
836 | /* Update stack pointer. */ | |
837 | regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp); | |
838 | ||
839 | return sp; | |
840 | } | |
841 | ||
842 | /* Function: extract_return_value | |
843 | Figure out where in REGBUF the called function has left its return value. | |
844 | Copy that into VALBUF. Be sure to account for CPU type. */ | |
845 | ||
846 | static void | |
847 | h8300_extract_return_value (struct type *type, struct regcache *regcache, | |
848 | void *valbuf) | |
849 | { | |
850 | int len = TYPE_LENGTH (type); | |
851 | ULONGEST c, addr; | |
852 | ||
853 | switch (len) | |
854 | { | |
855 | case 1: | |
856 | case 2: | |
857 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &c); | |
858 | store_unsigned_integer (valbuf, len, c); | |
859 | break; | |
860 | case 4: /* Needs two registers on plain H8/300 */ | |
861 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &c); | |
862 | store_unsigned_integer (valbuf, 2, c); | |
863 | regcache_cooked_read_unsigned (regcache, E_RET1_REGNUM, &c); | |
864 | store_unsigned_integer ((void *) ((char *) valbuf + 2), 2, c); | |
865 | break; | |
866 | case 8: /* long long is now 8 bytes. */ | |
867 | if (TYPE_CODE (type) == TYPE_CODE_INT) | |
868 | { | |
869 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &addr); | |
870 | c = read_memory_unsigned_integer ((CORE_ADDR) addr, len); | |
871 | store_unsigned_integer (valbuf, len, c); | |
872 | } | |
873 | else | |
874 | { | |
875 | error ("I don't know how this 8 byte value is returned."); | |
876 | } | |
877 | break; | |
878 | } | |
879 | } | |
880 | ||
881 | static void | |
882 | h8300h_extract_return_value (struct type *type, struct regcache *regcache, | |
883 | void *valbuf) | |
884 | { | |
885 | int len = TYPE_LENGTH (type); | |
886 | ULONGEST c, addr; | |
887 | ||
888 | switch (len) | |
889 | { | |
890 | case 1: | |
891 | case 2: | |
892 | case 4: | |
893 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &c); | |
894 | store_unsigned_integer (valbuf, len, c); | |
895 | break; | |
896 | case 8: /* long long is now 8 bytes. */ | |
897 | if (TYPE_CODE (type) == TYPE_CODE_INT) | |
898 | { | |
899 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &addr); | |
900 | c = read_memory_unsigned_integer ((CORE_ADDR) addr, len); | |
901 | store_unsigned_integer (valbuf, len, c); | |
902 | } | |
903 | else | |
904 | { | |
905 | error ("I don't know how this 8 byte value is returned."); | |
906 | } | |
907 | break; | |
908 | } | |
909 | } | |
910 | ||
911 | ||
912 | /* Function: store_return_value | |
913 | Place the appropriate value in the appropriate registers. | |
914 | Primarily used by the RETURN command. */ | |
915 | ||
916 | static void | |
917 | h8300_store_return_value (struct type *type, struct regcache *regcache, | |
918 | const void *valbuf) | |
919 | { | |
920 | int len = TYPE_LENGTH (type); | |
921 | ULONGEST val; | |
922 | ||
923 | switch (len) | |
924 | { | |
925 | case 1: | |
926 | case 2: /* short... */ | |
927 | val = extract_unsigned_integer (valbuf, len); | |
928 | regcache_cooked_write_unsigned (regcache, E_RET0_REGNUM, val); | |
929 | break; | |
930 | case 4: /* long, float */ | |
931 | val = extract_unsigned_integer (valbuf, len); | |
932 | regcache_cooked_write_unsigned (regcache, E_RET0_REGNUM, | |
933 | (val >> 16) & 0xffff); | |
934 | regcache_cooked_write_unsigned (regcache, E_RET1_REGNUM, val & 0xffff); | |
935 | break; | |
936 | case 8: /* long long, double and long double are all defined | |
937 | as 4 byte types so far so this shouldn't happen. */ | |
938 | error ("I don't know how to return an 8 byte value."); | |
939 | break; | |
940 | } | |
941 | } | |
942 | ||
943 | static void | |
944 | h8300h_store_return_value (struct type *type, struct regcache *regcache, | |
945 | const void *valbuf) | |
946 | { | |
947 | int len = TYPE_LENGTH (type); | |
948 | ULONGEST val; | |
949 | ||
950 | switch (len) | |
951 | { | |
952 | case 1: | |
953 | case 2: | |
954 | case 4: /* long, float */ | |
955 | val = extract_unsigned_integer (valbuf, len); | |
956 | regcache_cooked_write_unsigned (regcache, E_RET0_REGNUM, val); | |
957 | break; | |
958 | case 8: /* long long, double and long double are all defined | |
959 | as 4 byte types so far so this shouldn't happen. */ | |
960 | error ("I don't know how to return an 8 byte value."); | |
961 | break; | |
962 | } | |
963 | } | |
964 | ||
965 | static struct cmd_list_element *setmachinelist; | |
966 | ||
967 | static const char * | |
968 | h8300_register_name (int regno) | |
969 | { | |
970 | /* The register names change depending on which h8300 processor | |
971 | type is selected. */ | |
972 | static char *register_names[] = { | |
973 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", | |
974 | "sp", "", "pc", "cycles", "tick", "inst", | |
975 | "ccr", /* pseudo register */ | |
976 | }; | |
977 | if (regno < 0 | |
978 | || regno >= (sizeof (register_names) / sizeof (*register_names))) | |
979 | internal_error (__FILE__, __LINE__, | |
980 | "h8300_register_name: illegal register number %d", regno); | |
981 | else | |
982 | return register_names[regno]; | |
983 | } | |
984 | ||
985 | static const char * | |
986 | h8300s_register_name (int regno) | |
987 | { | |
988 | static char *register_names[] = { | |
989 | "er0", "er1", "er2", "er3", "er4", "er5", "er6", | |
990 | "sp", "", "pc", "cycles", "", "tick", "inst", | |
991 | "mach", "macl", | |
992 | "ccr", "exr" /* pseudo registers */ | |
993 | }; | |
994 | if (regno < 0 | |
995 | || regno >= (sizeof (register_names) / sizeof (*register_names))) | |
996 | internal_error (__FILE__, __LINE__, | |
997 | "h8300s_register_name: illegal register number %d", | |
998 | regno); | |
999 | else | |
1000 | return register_names[regno]; | |
1001 | } | |
1002 | ||
1003 | static const char * | |
1004 | h8300sx_register_name (int regno) | |
1005 | { | |
1006 | static char *register_names[] = { | |
1007 | "er0", "er1", "er2", "er3", "er4", "er5", "er6", | |
1008 | "sp", "", "pc", "cycles", "", "tick", "inst", | |
1009 | "mach", "macl", "sbr", "vbr", | |
1010 | "ccr", "exr" /* pseudo registers */ | |
1011 | }; | |
1012 | if (regno < 0 | |
1013 | || regno >= (sizeof (register_names) / sizeof (*register_names))) | |
1014 | internal_error (__FILE__, __LINE__, | |
1015 | "h8300sx_register_name: illegal register number %d", | |
1016 | regno); | |
1017 | else | |
1018 | return register_names[regno]; | |
1019 | } | |
1020 | ||
1021 | static void | |
1022 | h8300_print_register (struct gdbarch *gdbarch, struct ui_file *file, | |
1023 | struct frame_info *frame, int regno) | |
1024 | { | |
1025 | LONGEST rval; | |
1026 | const char *name = gdbarch_register_name (gdbarch, regno); | |
1027 | ||
1028 | if (!name || !*name) | |
1029 | return; | |
1030 | ||
1031 | rval = get_frame_register_signed (frame, regno); | |
1032 | ||
1033 | fprintf_filtered (file, "%-14s ", name); | |
1034 | if ((regno == E_PSEUDO_CCR_REGNUM) || \ | |
1035 | (regno == E_PSEUDO_EXR_REGNUM && is_h8300smode (current_gdbarch))) | |
1036 | { | |
1037 | fprintf_filtered (file, "0x%02x ", (unsigned char) rval); | |
1038 | print_longest (file, 'u', 1, rval); | |
1039 | } | |
1040 | else | |
1041 | { | |
1042 | fprintf_filtered (file, "0x%s ", phex ((ULONGEST) rval, BINWORD)); | |
1043 | print_longest (file, 'd', 1, rval); | |
1044 | } | |
1045 | if (regno == E_PSEUDO_CCR_REGNUM) | |
1046 | { | |
1047 | /* CCR register */ | |
1048 | int C, Z, N, V; | |
1049 | unsigned char l = rval & 0xff; | |
1050 | fprintf_filtered (file, "\t"); | |
1051 | fprintf_filtered (file, "I-%d ", (l & 0x80) != 0); | |
1052 | fprintf_filtered (file, "UI-%d ", (l & 0x40) != 0); | |
1053 | fprintf_filtered (file, "H-%d ", (l & 0x20) != 0); | |
1054 | fprintf_filtered (file, "U-%d ", (l & 0x10) != 0); | |
1055 | N = (l & 0x8) != 0; | |
1056 | Z = (l & 0x4) != 0; | |
1057 | V = (l & 0x2) != 0; | |
1058 | C = (l & 0x1) != 0; | |
1059 | fprintf_filtered (file, "N-%d ", N); | |
1060 | fprintf_filtered (file, "Z-%d ", Z); | |
1061 | fprintf_filtered (file, "V-%d ", V); | |
1062 | fprintf_filtered (file, "C-%d ", C); | |
1063 | if ((C | Z) == 0) | |
1064 | fprintf_filtered (file, "u> "); | |
1065 | if ((C | Z) == 1) | |
1066 | fprintf_filtered (file, "u<= "); | |
1067 | if ((C == 0)) | |
1068 | fprintf_filtered (file, "u>= "); | |
1069 | if (C == 1) | |
1070 | fprintf_filtered (file, "u< "); | |
1071 | if (Z == 0) | |
1072 | fprintf_filtered (file, "!= "); | |
1073 | if (Z == 1) | |
1074 | fprintf_filtered (file, "== "); | |
1075 | if ((N ^ V) == 0) | |
1076 | fprintf_filtered (file, ">= "); | |
1077 | if ((N ^ V) == 1) | |
1078 | fprintf_filtered (file, "< "); | |
1079 | if ((Z | (N ^ V)) == 0) | |
1080 | fprintf_filtered (file, "> "); | |
1081 | if ((Z | (N ^ V)) == 1) | |
1082 | fprintf_filtered (file, "<= "); | |
1083 | } | |
1084 | else if (regno == E_PSEUDO_EXR_REGNUM && is_h8300smode (current_gdbarch)) | |
1085 | { | |
1086 | /* EXR register */ | |
1087 | unsigned char l = rval & 0xff; | |
1088 | fprintf_filtered (file, "\t"); | |
1089 | fprintf_filtered (file, "T-%d - - - ", (l & 0x80) != 0); | |
1090 | fprintf_filtered (file, "I2-%d ", (l & 4) != 0); | |
1091 | fprintf_filtered (file, "I1-%d ", (l & 2) != 0); | |
1092 | fprintf_filtered (file, "I0-%d", (l & 1) != 0); | |
1093 | } | |
1094 | fprintf_filtered (file, "\n"); | |
1095 | } | |
1096 | ||
1097 | static void | |
1098 | h8300_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file, | |
1099 | struct frame_info *frame, int regno, int cpregs) | |
1100 | { | |
1101 | if (regno < 0) | |
1102 | { | |
1103 | for (regno = E_R0_REGNUM; regno <= E_SP_REGNUM; ++regno) | |
1104 | h8300_print_register (gdbarch, file, frame, regno); | |
1105 | h8300_print_register (gdbarch, file, frame, E_PSEUDO_CCR_REGNUM); | |
1106 | h8300_print_register (gdbarch, file, frame, E_PC_REGNUM); | |
1107 | if (is_h8300smode (current_gdbarch)) | |
1108 | { | |
1109 | h8300_print_register (gdbarch, file, frame, E_PSEUDO_EXR_REGNUM); | |
1110 | if (is_h8300sxmode (current_gdbarch)) | |
1111 | { | |
1112 | h8300_print_register (gdbarch, file, frame, E_SBR_REGNUM); | |
1113 | h8300_print_register (gdbarch, file, frame, E_VBR_REGNUM); | |
1114 | } | |
1115 | h8300_print_register (gdbarch, file, frame, E_MACH_REGNUM); | |
1116 | h8300_print_register (gdbarch, file, frame, E_MACL_REGNUM); | |
1117 | h8300_print_register (gdbarch, file, frame, E_CYCLES_REGNUM); | |
1118 | h8300_print_register (gdbarch, file, frame, E_TICKS_REGNUM); | |
1119 | h8300_print_register (gdbarch, file, frame, E_INSTS_REGNUM); | |
1120 | } | |
1121 | else | |
1122 | { | |
1123 | h8300_print_register (gdbarch, file, frame, E_CYCLES_REGNUM); | |
1124 | h8300_print_register (gdbarch, file, frame, E_TICK_REGNUM); | |
1125 | h8300_print_register (gdbarch, file, frame, E_INST_REGNUM); | |
1126 | } | |
1127 | } | |
1128 | else | |
1129 | { | |
1130 | if (regno == E_CCR_REGNUM) | |
1131 | h8300_print_register (gdbarch, file, frame, E_PSEUDO_CCR_REGNUM); | |
1132 | else if (regno == E_PSEUDO_EXR_REGNUM | |
1133 | && is_h8300smode (current_gdbarch)) | |
1134 | h8300_print_register (gdbarch, file, frame, E_PSEUDO_EXR_REGNUM); | |
1135 | else | |
1136 | h8300_print_register (gdbarch, file, frame, regno); | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | static struct type * | |
1141 | h8300_register_type (struct gdbarch *gdbarch, int regno) | |
1142 | { | |
1143 | if (regno < 0 || regno >= NUM_REGS + NUM_PSEUDO_REGS) | |
1144 | internal_error (__FILE__, __LINE__, | |
1145 | "h8300_register_type: illegal register number %d", regno); | |
1146 | else | |
1147 | { | |
1148 | switch (regno) | |
1149 | { | |
1150 | case E_PC_REGNUM: | |
1151 | return builtin_type_void_func_ptr; | |
1152 | case E_SP_REGNUM: | |
1153 | case E_FP_REGNUM: | |
1154 | return builtin_type_void_data_ptr; | |
1155 | default: | |
1156 | if (regno == E_PSEUDO_CCR_REGNUM) | |
1157 | return builtin_type_uint8; | |
1158 | else if (regno == E_PSEUDO_EXR_REGNUM) | |
1159 | return builtin_type_uint8; | |
1160 | else if (is_h8300hmode (current_gdbarch)) | |
1161 | return builtin_type_int32; | |
1162 | else | |
1163 | return builtin_type_int16; | |
1164 | } | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | static void | |
1169 | h8300_pseudo_register_read (struct gdbarch *gdbarch, | |
1170 | struct regcache *regcache, int regno, void *buf) | |
1171 | { | |
1172 | if (regno == E_PSEUDO_CCR_REGNUM) | |
1173 | regcache_raw_read (regcache, E_CCR_REGNUM, buf); | |
1174 | else if (regno == E_PSEUDO_EXR_REGNUM) | |
1175 | regcache_raw_read (regcache, E_EXR_REGNUM, buf); | |
1176 | else | |
1177 | regcache_raw_read (regcache, regno, buf); | |
1178 | } | |
1179 | ||
1180 | static void | |
1181 | h8300_pseudo_register_write (struct gdbarch *gdbarch, | |
1182 | struct regcache *regcache, int regno, | |
1183 | const void *buf) | |
1184 | { | |
1185 | if (regno == E_PSEUDO_CCR_REGNUM) | |
1186 | regcache_raw_write (regcache, E_CCR_REGNUM, buf); | |
1187 | else if (regno == E_PSEUDO_EXR_REGNUM) | |
1188 | regcache_raw_write (regcache, E_EXR_REGNUM, buf); | |
1189 | else | |
1190 | regcache_raw_write (regcache, regno, buf); | |
1191 | } | |
1192 | ||
1193 | static int | |
1194 | h8300_dbg_reg_to_regnum (int regno) | |
1195 | { | |
1196 | if (regno == E_CCR_REGNUM) | |
1197 | return E_PSEUDO_CCR_REGNUM; | |
1198 | return regno; | |
1199 | } | |
1200 | ||
1201 | static int | |
1202 | h8300s_dbg_reg_to_regnum (int regno) | |
1203 | { | |
1204 | if (regno == E_CCR_REGNUM) | |
1205 | return E_PSEUDO_CCR_REGNUM; | |
1206 | if (regno == E_EXR_REGNUM) | |
1207 | return E_PSEUDO_EXR_REGNUM; | |
1208 | return regno; | |
1209 | } | |
1210 | ||
1211 | static CORE_ADDR | |
1212 | h8300_extract_struct_value_address (struct regcache *regcache) | |
1213 | { | |
1214 | ULONGEST addr; | |
1215 | regcache_cooked_read_unsigned (regcache, E_RET0_REGNUM, &addr); | |
1216 | return addr; | |
1217 | } | |
1218 | ||
1219 | const static unsigned char * | |
1220 | h8300_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) | |
1221 | { | |
1222 | /*static unsigned char breakpoint[] = { 0x7A, 0xFF }; *//* ??? */ | |
1223 | static unsigned char breakpoint[] = { 0x01, 0x80 }; /* Sleep */ | |
1224 | ||
1225 | *lenptr = sizeof (breakpoint); | |
1226 | return breakpoint; | |
1227 | } | |
1228 | ||
1229 | static CORE_ADDR | |
1230 | h8300_push_dummy_code (struct gdbarch *gdbarch, | |
1231 | CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc, | |
1232 | struct value **args, int nargs, | |
1233 | struct type *value_type, | |
1234 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr) | |
1235 | { | |
1236 | /* Allocate space sufficient for a breakpoint. */ | |
1237 | sp = (sp - 2) & ~1; | |
1238 | /* Store the address of that breakpoint */ | |
1239 | *bp_addr = sp; | |
1240 | /* h8300 always starts the call at the callee's entry point. */ | |
1241 | *real_pc = funaddr; | |
1242 | return sp; | |
1243 | } | |
1244 | ||
1245 | static void | |
1246 | h8300_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, | |
1247 | struct frame_info *frame, const char *args) | |
1248 | { | |
1249 | fprintf_filtered (file, "\ | |
1250 | No floating-point info available for this processor.\n"); | |
1251 | } | |
1252 | ||
1253 | static struct gdbarch * | |
1254 | h8300_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1255 | { | |
1256 | struct gdbarch_tdep *tdep = NULL; | |
1257 | struct gdbarch *gdbarch; | |
1258 | ||
1259 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1260 | if (arches != NULL) | |
1261 | return arches->gdbarch; | |
1262 | ||
1263 | #if 0 | |
1264 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); | |
1265 | #endif | |
1266 | ||
1267 | if (info.bfd_arch_info->arch != bfd_arch_h8300) | |
1268 | return NULL; | |
1269 | ||
1270 | gdbarch = gdbarch_alloc (&info, 0); | |
1271 | ||
1272 | switch (info.bfd_arch_info->mach) | |
1273 | { | |
1274 | case bfd_mach_h8300: | |
1275 | set_gdbarch_num_regs (gdbarch, 13); | |
1276 | set_gdbarch_num_pseudo_regs (gdbarch, 1); | |
1277 | set_gdbarch_ecoff_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); | |
1278 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); | |
1279 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); | |
1280 | set_gdbarch_stab_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); | |
1281 | set_gdbarch_register_name (gdbarch, h8300_register_name); | |
1282 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); | |
1283 | set_gdbarch_addr_bit (gdbarch, 2 * TARGET_CHAR_BIT); | |
1284 | set_gdbarch_extract_return_value (gdbarch, h8300_extract_return_value); | |
1285 | set_gdbarch_store_return_value (gdbarch, h8300_store_return_value); | |
1286 | set_gdbarch_print_insn (gdbarch, print_insn_h8300); | |
1287 | break; | |
1288 | case bfd_mach_h8300h: | |
1289 | case bfd_mach_h8300hn: | |
1290 | set_gdbarch_num_regs (gdbarch, 13); | |
1291 | set_gdbarch_num_pseudo_regs (gdbarch, 1); | |
1292 | set_gdbarch_ecoff_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); | |
1293 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); | |
1294 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); | |
1295 | set_gdbarch_stab_reg_to_regnum (gdbarch, h8300_dbg_reg_to_regnum); | |
1296 | set_gdbarch_register_name (gdbarch, h8300_register_name); | |
1297 | if (info.bfd_arch_info->mach != bfd_mach_h8300hn) | |
1298 | { | |
1299 | set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1300 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1301 | } | |
1302 | else | |
1303 | { | |
1304 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); | |
1305 | set_gdbarch_addr_bit (gdbarch, 2 * TARGET_CHAR_BIT); | |
1306 | } | |
1307 | set_gdbarch_extract_return_value (gdbarch, h8300h_extract_return_value); | |
1308 | set_gdbarch_store_return_value (gdbarch, h8300h_store_return_value); | |
1309 | set_gdbarch_print_insn (gdbarch, print_insn_h8300h); | |
1310 | break; | |
1311 | case bfd_mach_h8300s: | |
1312 | case bfd_mach_h8300sn: | |
1313 | set_gdbarch_num_regs (gdbarch, 16); | |
1314 | set_gdbarch_num_pseudo_regs (gdbarch, 2); | |
1315 | set_gdbarch_ecoff_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); | |
1316 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); | |
1317 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); | |
1318 | set_gdbarch_stab_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); | |
1319 | set_gdbarch_register_name (gdbarch, h8300s_register_name); | |
1320 | if (info.bfd_arch_info->mach != bfd_mach_h8300sn) | |
1321 | { | |
1322 | set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1323 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1324 | } | |
1325 | else | |
1326 | { | |
1327 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); | |
1328 | set_gdbarch_addr_bit (gdbarch, 2 * TARGET_CHAR_BIT); | |
1329 | } | |
1330 | set_gdbarch_extract_return_value (gdbarch, h8300h_extract_return_value); | |
1331 | set_gdbarch_store_return_value (gdbarch, h8300h_store_return_value); | |
1332 | set_gdbarch_print_insn (gdbarch, print_insn_h8300s); | |
1333 | break; | |
1334 | case bfd_mach_h8300sx: | |
1335 | case bfd_mach_h8300sxn: | |
1336 | set_gdbarch_num_regs (gdbarch, 18); | |
1337 | set_gdbarch_num_pseudo_regs (gdbarch, 2); | |
1338 | set_gdbarch_ecoff_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); | |
1339 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); | |
1340 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); | |
1341 | set_gdbarch_stab_reg_to_regnum (gdbarch, h8300s_dbg_reg_to_regnum); | |
1342 | set_gdbarch_register_name (gdbarch, h8300sx_register_name); | |
1343 | if (info.bfd_arch_info->mach != bfd_mach_h8300sxn) | |
1344 | { | |
1345 | set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1346 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1347 | } | |
1348 | else | |
1349 | { | |
1350 | set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); | |
1351 | set_gdbarch_addr_bit (gdbarch, 2 * TARGET_CHAR_BIT); | |
1352 | } | |
1353 | set_gdbarch_extract_return_value (gdbarch, h8300h_extract_return_value); | |
1354 | set_gdbarch_store_return_value (gdbarch, h8300h_store_return_value); | |
1355 | set_gdbarch_print_insn (gdbarch, print_insn_h8300s); | |
1356 | break; | |
1357 | } | |
1358 | ||
1359 | set_gdbarch_pseudo_register_read (gdbarch, h8300_pseudo_register_read); | |
1360 | set_gdbarch_pseudo_register_write (gdbarch, h8300_pseudo_register_write); | |
1361 | ||
1362 | /* | |
1363 | * Basic register fields and methods. | |
1364 | */ | |
1365 | ||
1366 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
1367 | set_gdbarch_deprecated_fp_regnum (gdbarch, E_FP_REGNUM); | |
1368 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); | |
1369 | set_gdbarch_register_type (gdbarch, h8300_register_type); | |
1370 | set_gdbarch_print_registers_info (gdbarch, h8300_print_registers_info); | |
1371 | set_gdbarch_print_float_info (gdbarch, h8300_print_float_info); | |
1372 | ||
1373 | /* | |
1374 | * Frame Info | |
1375 | */ | |
1376 | set_gdbarch_skip_prologue (gdbarch, h8300_skip_prologue); | |
1377 | ||
1378 | /* Frame unwinder. */ | |
1379 | set_gdbarch_unwind_dummy_id (gdbarch, h8300_unwind_dummy_id); | |
1380 | set_gdbarch_unwind_pc (gdbarch, h8300_unwind_pc); | |
1381 | ||
1382 | /* Hook in the DWARF CFI frame unwinder. */ | |
1383 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
1384 | ||
1385 | /* | |
1386 | * Miscelany | |
1387 | */ | |
1388 | /* Stack grows up. */ | |
1389 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
1390 | ||
1391 | set_gdbarch_deprecated_extract_struct_value_address (gdbarch, | |
1392 | h8300_extract_struct_value_address); | |
1393 | set_gdbarch_deprecated_use_struct_convention (gdbarch, | |
1394 | always_use_struct_convention); | |
1395 | set_gdbarch_breakpoint_from_pc (gdbarch, h8300_breakpoint_from_pc); | |
1396 | set_gdbarch_push_dummy_code (gdbarch, h8300_push_dummy_code); | |
1397 | set_gdbarch_push_dummy_call (gdbarch, h8300_push_dummy_call); | |
1398 | ||
1399 | set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); | |
1400 | set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1401 | set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
1402 | set_gdbarch_double_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1403 | set_gdbarch_long_double_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1404 | ||
1405 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
1406 | ||
1407 | /* Char is unsigned. */ | |
1408 | set_gdbarch_char_signed (gdbarch, 0); | |
1409 | ||
1410 | frame_unwind_append_sniffer (gdbarch, h8300_frame_sniffer); | |
1411 | ||
1412 | return gdbarch; | |
1413 | ||
1414 | } | |
1415 | ||
1416 | extern initialize_file_ftype _initialize_h8300_tdep; /* -Wmissing-prototypes */ | |
1417 | ||
1418 | void | |
1419 | _initialize_h8300_tdep (void) | |
1420 | { | |
1421 | register_gdbarch_init (bfd_arch_h8300, h8300_gdbarch_init); | |
1422 | } | |
1423 | ||
1424 | static int | |
1425 | is_h8300hmode (struct gdbarch *gdbarch) | |
1426 | { | |
1427 | return gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300sx | |
1428 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300sxn | |
1429 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300s | |
1430 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300sn | |
1431 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300h | |
1432 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300hn; | |
1433 | } | |
1434 | ||
1435 | static int | |
1436 | is_h8300smode (struct gdbarch *gdbarch) | |
1437 | { | |
1438 | return gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300sx | |
1439 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300sxn | |
1440 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300s | |
1441 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300sn; | |
1442 | } | |
1443 | ||
1444 | static int | |
1445 | is_h8300sxmode (struct gdbarch *gdbarch) | |
1446 | { | |
1447 | return gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300sx | |
1448 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300sxn; | |
1449 | } | |
1450 | ||
1451 | static int | |
1452 | is_h8300_normal_mode (struct gdbarch *gdbarch) | |
1453 | { | |
1454 | return gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300sxn | |
1455 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300sn | |
1456 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_h8300hn; | |
1457 | } |