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27fd2f50 Q |
1 | /* Target-dependent code for the S+core architecture, for GDB, |
2 | the GNU Debugger. | |
3 | ||
6aba47ca | 4 | Copyright (C) 2006, 2007 Free Software Foundation, Inc. |
27fd2f50 Q |
5 | |
6 | Contributed by Qinwei (qinwei@sunnorth.com.cn) | |
7 | Contributed by Ching-Peng Lin (cplin@sunplus.com) | |
8 | ||
9 | This file is part of GDB. | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 2 of the License, or | |
14 | (at your option) any later version. | |
15 | ||
16 | This program is distributed in the hope that it will be useful, | |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU General Public License | |
22 | along with this program; if not, write to the Free Software | |
23 | Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
24 | Boston, MA 02110-1301, USA. */ | |
25 | ||
26 | #include "defs.h" | |
27 | #include "gdb_assert.h" | |
28 | #include "inferior.h" | |
29 | #include "symtab.h" | |
30 | #include "objfiles.h" | |
31 | #include "gdbcore.h" | |
32 | #include "target.h" | |
33 | #include "arch-utils.h" | |
34 | #include "regcache.h" | |
35 | #include "dis-asm.h" | |
36 | #include "frame-unwind.h" | |
37 | #include "frame-base.h" | |
38 | #include "trad-frame.h" | |
39 | #include "dwarf2-frame.h" | |
40 | #include "score-tdep.h" | |
41 | ||
42 | #define G_FLD(_i,_ms,_ls) (((_i) << (31 - (_ms))) >> (31 - (_ms) + (_ls))) | |
43 | #define RM_PBITS(_raw) ((G_FLD(_raw, 31, 16) << 15) | G_FLD(_raw, 14, 0)) | |
44 | ||
45 | typedef struct{ | |
46 | unsigned int v; | |
47 | unsigned int raw; | |
48 | char is15; | |
49 | }inst_t; | |
50 | ||
51 | struct score_frame_cache | |
52 | { | |
53 | CORE_ADDR base; | |
54 | struct trad_frame_saved_reg *saved_regs; | |
55 | }; | |
56 | ||
57 | #if 0 | |
58 | /* If S+core GCC will generate these instructions in the prologue: | |
59 | ||
60 | lw rx, imm1 | |
61 | addi rx, -imm2 | |
62 | mv! r2, rx | |
63 | ||
64 | then .pdr section is used. */ | |
65 | ||
66 | #define P_SIZE 8 | |
67 | #define PI_SYM 0 | |
68 | #define PI_R_MSK 1 | |
69 | #define PI_R_OFF 2 | |
70 | #define PI_R_LEF 4 | |
71 | #define PI_F_OFF 5 | |
72 | #define PI_F_REG 6 | |
73 | #define PI_RAREG 7 | |
74 | ||
75 | typedef struct frame_extra_info | |
76 | { | |
77 | CORE_ADDR p_frame; | |
78 | unsigned int pdr[P_SIZE]; | |
79 | } extra_info_t; | |
80 | ||
81 | struct obj_priv | |
82 | { | |
83 | bfd_size_type size; | |
84 | char *contents; | |
85 | }; | |
86 | ||
87 | static bfd *the_bfd; | |
88 | ||
89 | static int | |
90 | score_compare_pdr_entries (const void *a, const void *b) | |
91 | { | |
92 | CORE_ADDR lhs = bfd_get_32 (the_bfd, (bfd_byte *) a); | |
93 | CORE_ADDR rhs = bfd_get_32 (the_bfd, (bfd_byte *) b); | |
94 | if (lhs < rhs) | |
95 | return -1; | |
96 | else if (lhs == rhs) | |
97 | return 0; | |
98 | else | |
99 | return 1; | |
100 | } | |
101 | ||
102 | static void | |
103 | score_analyze_pdr_section (CORE_ADDR startaddr, CORE_ADDR pc, | |
104 | struct frame_info *next_frame, | |
105 | struct score_frame_cache *this_cache) | |
106 | { | |
107 | struct symbol *sym; | |
108 | struct obj_section *sec; | |
109 | extra_info_t *fci_ext; | |
110 | CORE_ADDR leaf_ra_stack_addr = -1; | |
111 | ||
112 | gdb_assert (startaddr <= pc); | |
113 | gdb_assert (this_cache != NULL); | |
114 | ||
115 | fci_ext = frame_obstack_zalloc (sizeof (extra_info_t)); | |
116 | if ((sec = find_pc_section (pc)) == NULL) | |
117 | { | |
118 | error ("Can't find section in file:%s, line:%d!", __FILE__, __LINE__); | |
119 | return; | |
120 | } | |
121 | ||
122 | /* Anylyze .pdr section and get coresponding fields. */ | |
123 | { | |
124 | static struct obj_priv *priv = NULL; | |
125 | ||
126 | if (priv == NULL) | |
127 | { | |
128 | asection *bfdsec; | |
129 | priv = obstack_alloc (&sec->objfile->objfile_obstack, | |
130 | sizeof (struct obj_priv)); | |
131 | if ((bfdsec = bfd_get_section_by_name (sec->objfile->obfd, ".pdr"))) | |
132 | { | |
133 | priv->size = bfd_section_size (sec->objfile->obfd, bfdsec); | |
134 | priv->contents = obstack_alloc (&sec->objfile->objfile_obstack, | |
135 | priv->size); | |
136 | bfd_get_section_contents (sec->objfile->obfd, bfdsec, | |
137 | priv->contents, 0, priv->size); | |
138 | the_bfd = sec->objfile->obfd; | |
139 | qsort (priv->contents, priv->size / 32, 32, | |
140 | score_compare_pdr_entries); | |
141 | the_bfd = NULL; | |
142 | } | |
143 | else | |
144 | priv->size = 0; | |
145 | } | |
146 | if (priv->size != 0) | |
147 | { | |
148 | int low = 0, mid, high = priv->size / 32; | |
149 | char *ptr; | |
150 | do | |
151 | ||
152 | { | |
153 | CORE_ADDR pdr_pc; | |
154 | mid = (low + high) / 2; | |
155 | ptr = priv->contents + mid * 32; | |
156 | pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr); | |
157 | pdr_pc += ANOFFSET (sec->objfile->section_offsets, | |
158 | SECT_OFF_TEXT (sec->objfile)); | |
159 | if (pdr_pc == startaddr) | |
160 | break; | |
161 | if (pdr_pc > startaddr) | |
162 | high = mid; | |
163 | else | |
164 | low = mid + 1; | |
165 | } | |
166 | while (low != high); | |
167 | ||
168 | if (low != high) | |
169 | { | |
170 | gdb_assert (bfd_get_32 (sec->objfile->obfd, ptr) == startaddr); | |
171 | #define EXT_PDR(_pi) bfd_get_32(sec->objfile->obfd, ptr+((_pi)<<2)) | |
172 | fci_ext->pdr[PI_SYM] = EXT_PDR (PI_SYM); | |
173 | fci_ext->pdr[PI_R_MSK] = EXT_PDR (PI_R_MSK); | |
174 | fci_ext->pdr[PI_R_OFF] = EXT_PDR (PI_R_OFF); | |
175 | fci_ext->pdr[PI_R_LEF] = EXT_PDR (PI_R_LEF); | |
176 | fci_ext->pdr[PI_F_OFF] = EXT_PDR (PI_F_OFF); | |
177 | fci_ext->pdr[PI_F_REG] = EXT_PDR (PI_F_REG); | |
178 | fci_ext->pdr[PI_RAREG] = EXT_PDR (PI_RAREG); | |
179 | #undef EXT_PDR | |
180 | } | |
181 | } | |
182 | } | |
183 | } | |
184 | #endif | |
185 | ||
186 | static struct type * | |
187 | score_register_type (struct gdbarch *gdbarch, int regnum) | |
188 | { | |
189 | gdb_assert (regnum >= 0 && regnum < SCORE_NUM_REGS); | |
190 | return builtin_type_uint32; | |
191 | } | |
192 | ||
193 | static LONGEST | |
194 | score_read_unsigned_register (int regnum) | |
195 | { | |
196 | LONGEST val; | |
197 | regcache_cooked_read_unsigned (current_regcache, regnum, &val); | |
198 | return val; | |
199 | } | |
200 | ||
201 | static CORE_ADDR | |
202 | score_read_sp (void) | |
203 | { | |
204 | return score_read_unsigned_register (SCORE_SP_REGNUM); | |
205 | } | |
206 | ||
207 | static CORE_ADDR | |
208 | score_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
209 | { | |
210 | return frame_unwind_register_unsigned (next_frame, SCORE_PC_REGNUM); | |
211 | } | |
212 | ||
213 | static const char * | |
214 | score_register_name (int regnum) | |
215 | { | |
216 | const char *score_register_names[] = { | |
217 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
218 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
219 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", | |
220 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", | |
221 | ||
222 | "PSR", "COND", "ECR", "EXCPVEC", | |
223 | "CCR", "EPC", "EMA", "TLBLOCK", | |
224 | "TLBPT", "PEADDR", "TLBRPT", "PEVN", | |
225 | "PECTX", "LIMPFN", "LDMPFN", "PREV", | |
226 | "DREG", "PC", "DSAVE", "COUNTER", | |
227 | "LDCR", "STCR", "CEH", "CEL", | |
228 | }; | |
229 | ||
230 | gdb_assert (regnum >= 0 && regnum < SCORE_NUM_REGS); | |
231 | return score_register_names[regnum]; | |
232 | } | |
233 | ||
234 | static int | |
235 | score_register_sim_regno (int regnum) | |
236 | { | |
237 | gdb_assert (regnum >= 0 && regnum < SCORE_NUM_REGS); | |
238 | return regnum; | |
239 | } | |
240 | ||
241 | static int | |
242 | score_print_insn (bfd_vma memaddr, struct disassemble_info *info) | |
243 | { | |
244 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) | |
245 | return print_insn_big_score (memaddr, info); | |
246 | else | |
247 | return print_insn_little_score (memaddr, info); | |
248 | } | |
249 | ||
250 | static const gdb_byte * | |
251 | score_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) | |
252 | { | |
253 | gdb_byte buf[SCORE_INSTLEN] = { 0 }; | |
254 | int ret; | |
255 | unsigned int raw; | |
256 | ||
257 | if ((ret = target_read_memory (*pcptr & ~0x3, buf, SCORE_INSTLEN)) != 0) | |
258 | { | |
259 | memory_error (ret, *pcptr); | |
260 | } | |
261 | raw = extract_unsigned_integer (buf, SCORE_INSTLEN); | |
262 | ||
263 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) | |
264 | { | |
265 | if (!(raw & 0x80008000)) | |
266 | { | |
267 | /* 16bits instruction. */ | |
268 | static gdb_byte big_breakpoint16[] = { 0x60, 0x02 }; | |
269 | *pcptr &= ~0x1; | |
270 | *lenptr = sizeof (big_breakpoint16); | |
271 | return big_breakpoint16; | |
272 | } | |
273 | else | |
274 | { | |
275 | /* 32bits instruction. */ | |
276 | static gdb_byte big_breakpoint32[] = { 0x80, 0x00, 0x80, 0x06 }; | |
277 | *pcptr &= ~0x3; | |
278 | *lenptr = sizeof (big_breakpoint32); | |
279 | return big_breakpoint32; | |
280 | } | |
281 | } | |
282 | else | |
283 | { | |
284 | if (!(raw & 0x80008000)) | |
285 | { | |
286 | /* 16bits instruction. */ | |
287 | static gdb_byte little_breakpoint16[] = { 0x02, 0x60 }; | |
288 | *pcptr &= ~0x1; | |
289 | *lenptr = sizeof (little_breakpoint16); | |
290 | return little_breakpoint16; | |
291 | } | |
292 | else | |
293 | { | |
294 | /* 32bits instruction. */ | |
295 | static gdb_byte little_breakpoint32[] = { 0x06, 0x80, 0x00, 0x80 }; | |
296 | *pcptr &= ~0x3; | |
297 | *lenptr = sizeof (little_breakpoint32); | |
298 | return little_breakpoint32; | |
299 | } | |
300 | } | |
301 | } | |
302 | ||
303 | static CORE_ADDR | |
304 | score_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) | |
305 | { | |
306 | return align_down (addr, 16); | |
307 | } | |
308 | ||
309 | static void | |
310 | score_xfer_register (struct regcache *regcache, int regnum, int length, | |
311 | enum bfd_endian endian, gdb_byte *readbuf, | |
312 | const gdb_byte *writebuf, int buf_offset) | |
313 | { | |
314 | int reg_offset = 0; | |
315 | gdb_assert (regnum >= 0 && regnum < SCORE_NUM_REGS); | |
316 | ||
317 | switch (endian) | |
318 | { | |
319 | case BFD_ENDIAN_BIG: | |
320 | reg_offset = SCORE_REGSIZE - length; | |
321 | break; | |
322 | case BFD_ENDIAN_LITTLE: | |
323 | reg_offset = 0; | |
324 | break; | |
325 | case BFD_ENDIAN_UNKNOWN: | |
326 | reg_offset = 0; | |
327 | break; | |
328 | default: | |
329 | internal_error (__FILE__, __LINE__, _("score_xfer_register error!")); | |
330 | } | |
331 | ||
332 | if (readbuf != NULL) | |
333 | regcache_cooked_read_part (regcache, regnum, reg_offset, length, | |
334 | readbuf + buf_offset); | |
335 | if (writebuf != NULL) | |
336 | regcache_cooked_write_part (regcache, regnum, reg_offset, length, | |
337 | writebuf + buf_offset); | |
338 | } | |
339 | ||
340 | static enum return_value_convention | |
341 | score_return_value (struct gdbarch *gdbarch, struct type *type, | |
342 | struct regcache *regcache, | |
343 | gdb_byte * readbuf, const gdb_byte * writebuf) | |
344 | { | |
345 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
346 | || TYPE_CODE (type) == TYPE_CODE_UNION | |
347 | || TYPE_CODE (type) == TYPE_CODE_ARRAY) | |
348 | return RETURN_VALUE_STRUCT_CONVENTION; | |
349 | else | |
350 | { | |
351 | int offset; | |
352 | int regnum; | |
353 | for (offset = 0, regnum = SCORE_A0_REGNUM; | |
354 | offset < TYPE_LENGTH (type); | |
355 | offset += SCORE_REGSIZE, regnum++) | |
356 | { | |
357 | int xfer = SCORE_REGSIZE; | |
358 | if (offset + xfer > TYPE_LENGTH (type)) | |
359 | xfer = TYPE_LENGTH (type) - offset; | |
360 | score_xfer_register (regcache, regnum, xfer, TARGET_BYTE_ORDER, | |
361 | readbuf, writebuf, offset); | |
362 | } | |
363 | return RETURN_VALUE_REGISTER_CONVENTION; | |
364 | } | |
365 | } | |
366 | ||
367 | static struct frame_id | |
368 | score_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
369 | { | |
370 | return frame_id_build ( | |
371 | frame_unwind_register_unsigned (next_frame, SCORE_SP_REGNUM), | |
372 | frame_pc_unwind (next_frame)); | |
373 | } | |
374 | ||
375 | static int | |
376 | score_type_needs_double_align (struct type *type) | |
377 | { | |
378 | enum type_code typecode = TYPE_CODE (type); | |
379 | ||
380 | if (typecode == TYPE_CODE_INT && TYPE_LENGTH (type) == 8) | |
381 | return 1; | |
382 | if (typecode == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8) | |
383 | return 1; | |
384 | else if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION) | |
385 | { | |
386 | int i, n; | |
387 | ||
388 | n = TYPE_NFIELDS (type); | |
389 | for (i = 0; i < n; i++) | |
390 | if (score_type_needs_double_align (TYPE_FIELD_TYPE (type, i))) | |
391 | return 1; | |
392 | return 0; | |
393 | } | |
394 | return 0; | |
395 | } | |
396 | ||
397 | static CORE_ADDR | |
398 | score_push_dummy_call (struct gdbarch *gdbarch, struct value *function, | |
399 | struct regcache *regcache, CORE_ADDR bp_addr, | |
400 | int nargs, struct value **args, CORE_ADDR sp, | |
401 | int struct_return, CORE_ADDR struct_addr) | |
402 | { | |
403 | int argnum; | |
404 | int argreg; | |
405 | int arglen = 0; | |
406 | CORE_ADDR stack_offset = 0; | |
407 | CORE_ADDR addr = 0; | |
408 | ||
409 | /* Step 1, Save RA. */ | |
410 | regcache_cooked_write_unsigned (regcache, SCORE_RA_REGNUM, bp_addr); | |
411 | ||
412 | /* Step 2, Make space on the stack for the args. */ | |
413 | struct_addr = align_down (struct_addr, 16); | |
414 | sp = align_down (sp, 16); | |
415 | for (argnum = 0; argnum < nargs; argnum++) | |
416 | arglen += align_up (TYPE_LENGTH (value_type (args[argnum])), | |
417 | SCORE_REGSIZE); | |
418 | sp -= align_up (arglen, 16); | |
419 | ||
420 | argreg = SCORE_BEGIN_ARG_REGNUM; | |
421 | ||
422 | /* Step 3, Check if struct return then save the struct address to r4 and | |
423 | increase the stack_offset by 4. */ | |
424 | if (struct_return) | |
425 | { | |
426 | regcache_cooked_write_unsigned (regcache, argreg++, struct_addr); | |
427 | stack_offset += SCORE_REGSIZE; | |
428 | } | |
429 | ||
430 | /* Step 4, Load arguments: | |
431 | If arg length is too long (> 4 bytes), | |
432 | then split the arg and save every parts. */ | |
433 | for (argnum = 0; argnum < nargs; argnum++) | |
434 | { | |
435 | struct value *arg = args[argnum]; | |
436 | struct type *arg_type = check_typedef (value_type (arg)); | |
437 | arglen = TYPE_LENGTH (arg_type); | |
438 | enum type_code typecode = TYPE_CODE (arg_type); | |
439 | const gdb_byte *val = value_contents (arg); | |
440 | int downward_offset = 0; | |
441 | ||
442 | int odd_sized_struct_p = (arglen > SCORE_REGSIZE | |
443 | && arglen % SCORE_REGSIZE != 0); | |
444 | int arg_last_part_p = 0; | |
445 | ||
446 | /* If a arg should be aligned to 8 bytes (long long or double), | |
447 | the value should be put to even register numbers. */ | |
448 | if (score_type_needs_double_align (arg_type)) | |
449 | { | |
450 | if (argreg & 1) | |
451 | argreg++; | |
452 | } | |
453 | ||
454 | /* If sizeof a block < SCORE_REGSIZE, then Score GCC will chose | |
455 | the default "downward"/"upward" method: | |
456 | ||
457 | Example: | |
458 | ||
459 | struct struc | |
460 | { | |
461 | char a; char b; char c; | |
462 | } s = {'a', 'b', 'c'}; | |
463 | ||
464 | Big endian: s = {X, 'a', 'b', 'c'} | |
465 | Little endian: s = {'a', 'b', 'c', X} | |
466 | ||
467 | Where X is a hole. */ | |
468 | ||
469 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG | |
470 | && (typecode == TYPE_CODE_STRUCT | |
471 | || typecode == TYPE_CODE_UNION) | |
472 | && argreg > SCORE_LAST_ARG_REGNUM | |
473 | && arglen < SCORE_REGSIZE) | |
474 | downward_offset += (SCORE_REGSIZE - arglen); | |
475 | ||
476 | while (arglen > 0) | |
477 | { | |
478 | int partial_len = arglen < SCORE_REGSIZE ? arglen : SCORE_REGSIZE; | |
479 | ULONGEST regval = extract_unsigned_integer (val, partial_len); | |
480 | ||
481 | /* The last part of a arg should shift left when | |
482 | TARGET_BYTE_ORDER is BFD_ENDIAN_BIG. */ | |
483 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG | |
484 | && arg_last_part_p == 1 | |
485 | && (typecode == TYPE_CODE_STRUCT | |
486 | || typecode == TYPE_CODE_UNION)) | |
487 | regval <<= ((SCORE_REGSIZE - partial_len) * TARGET_CHAR_BIT); | |
488 | ||
489 | /* Always increase the stack_offset and save args to stack. */ | |
490 | addr = sp + stack_offset + downward_offset; | |
491 | write_memory (addr, val, partial_len); | |
492 | ||
493 | if (argreg <= SCORE_LAST_ARG_REGNUM) | |
494 | { | |
495 | regcache_cooked_write_unsigned (regcache, argreg++, regval); | |
496 | if (arglen > SCORE_REGSIZE && arglen < SCORE_REGSIZE * 2) | |
497 | arg_last_part_p = 1; | |
498 | } | |
499 | ||
500 | val += partial_len; | |
501 | arglen -= partial_len; | |
502 | stack_offset += align_up (partial_len, SCORE_REGSIZE); | |
503 | } | |
504 | } | |
505 | ||
506 | /* Step 5, Save SP. */ | |
507 | regcache_cooked_write_unsigned (regcache, SCORE_SP_REGNUM, sp); | |
508 | ||
509 | return sp; | |
510 | } | |
511 | ||
512 | static inst_t * | |
513 | score_fetch_instruction (CORE_ADDR addr) | |
514 | { | |
515 | static inst_t inst = { 0, 0 }; | |
516 | char buf[SCORE_INSTLEN]; | |
517 | int big; | |
518 | int ret = target_read_memory (addr & ~0x3, buf, SCORE_INSTLEN); | |
519 | unsigned int raw; | |
520 | ||
521 | if (ret) | |
522 | { | |
523 | memory_error (ret, addr); | |
524 | return 0; | |
525 | } | |
526 | inst.raw = extract_unsigned_integer (buf, SCORE_INSTLEN); | |
527 | inst.is15 = !(inst.raw & 0x80008000); | |
528 | inst.v = RM_PBITS (inst.raw); | |
529 | big = (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG); | |
530 | ||
531 | if (inst.is15) | |
532 | { | |
533 | if (big ^ ((addr & 0x2) == 2)) | |
534 | inst.v = G_FLD (inst.v, 29, 15); | |
535 | else | |
536 | inst.v = G_FLD (inst.v, 14, 0); | |
537 | } | |
538 | return &inst; | |
539 | } | |
540 | ||
541 | static CORE_ADDR | |
542 | score_skip_prologue (CORE_ADDR pc) | |
543 | { | |
544 | CORE_ADDR cpc = pc; | |
545 | int iscan = 32, stack_sub = 0; | |
546 | while (iscan-- > 0) | |
547 | { | |
548 | inst_t *inst = score_fetch_instruction (cpc); | |
549 | if (!inst) | |
550 | break; | |
551 | if (!inst->is15 && !stack_sub | |
552 | && (G_FLD (inst->v, 29, 25) == 0x1 | |
553 | && G_FLD (inst->v, 24, 20) == 0x0)) | |
554 | { | |
555 | /* addi r0, offset */ | |
556 | pc = stack_sub = cpc + SCORE_INSTLEN; | |
557 | } | |
558 | else if (!inst->is15 | |
559 | && inst->v == RM_PBITS (0x8040bc56)) | |
560 | { | |
561 | /* mv r2, r0 */ | |
562 | pc = cpc + SCORE_INSTLEN; | |
563 | break; | |
564 | } | |
565 | else if (inst->is15 | |
566 | && inst->v == RM_PBITS (0x0203)) | |
567 | { | |
568 | /* mv! r2, r0 */ | |
569 | pc = cpc + SCORE16_INSTLEN; | |
570 | break; | |
571 | } | |
572 | else if (inst->is15 | |
573 | && ((G_FLD (inst->v, 14, 12) == 3) /* j15 form */ | |
574 | || (G_FLD (inst->v, 14, 12) == 4) /* b15 form */ | |
575 | || (G_FLD (inst->v, 14, 12) == 0x0 | |
576 | && G_FLD (inst->v, 3, 0) == 0x4))) /* br! */ | |
577 | break; | |
578 | else if (!inst->is15 | |
579 | && ((G_FLD (inst->v, 29, 25) == 2) /* j32 form */ | |
580 | || (G_FLD (inst->v, 29, 25) == 4) /* b32 form */ | |
581 | || (G_FLD (inst->v, 29, 25) == 0x0 | |
582 | && G_FLD (inst->v, 6, 1) == 0x4))) /* br */ | |
583 | break; | |
584 | ||
585 | cpc += inst->is15 ? SCORE16_INSTLEN : SCORE_INSTLEN; | |
586 | } | |
587 | return pc; | |
588 | } | |
589 | ||
590 | static int | |
591 | score_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR cur_pc) | |
592 | { | |
593 | inst_t *inst = score_fetch_instruction (cur_pc); | |
594 | ||
595 | if (inst->v == 0x23) | |
596 | return 1; /* mv! r0, r2 */ | |
597 | else if (G_FLD (inst->v, 14, 12) == 0x2 | |
598 | && G_FLD (inst->v, 3, 0) == 0xa) | |
599 | return 1; /* pop! */ | |
600 | else if (G_FLD (inst->v, 14, 12) == 0x0 | |
601 | && G_FLD (inst->v, 7, 0) == 0x34) | |
602 | return 1; /* br! r3 */ | |
603 | else if (G_FLD (inst->v, 29, 15) == 0x2 | |
604 | && G_FLD (inst->v, 6, 1) == 0x2b) | |
605 | return 1; /* mv r0, r2 */ | |
606 | else if (G_FLD (inst->v, 29, 25) == 0x0 | |
607 | && G_FLD (inst->v, 6, 1) == 0x4 | |
608 | && G_FLD (inst->v, 19, 15) == 0x3) | |
609 | return 1; /* br r3 */ | |
610 | else | |
611 | return 0; | |
612 | } | |
613 | ||
614 | static void | |
615 | score_analyze_prologue (CORE_ADDR startaddr, CORE_ADDR pc, | |
616 | struct frame_info *next_frame, | |
617 | struct score_frame_cache *this_cache) | |
618 | { | |
619 | CORE_ADDR sp; | |
620 | CORE_ADDR cur_pc = startaddr; | |
621 | ||
622 | int sp_offset = 0; | |
623 | int ra_offset = 0; | |
624 | int fp_offset = 0; | |
625 | int ra_offset_p = 0; | |
626 | int fp_offset_p = 0; | |
627 | int inst_len = 0; | |
628 | ||
629 | sp = frame_unwind_register_unsigned (next_frame, SCORE_SP_REGNUM); | |
630 | ||
631 | for (; cur_pc < pc; cur_pc += inst_len) | |
632 | { | |
633 | inst_t *inst = score_fetch_instruction (cur_pc); | |
634 | if (inst->is15 == 1) | |
635 | { | |
636 | inst_len = SCORE16_INSTLEN; | |
637 | ||
638 | if (G_FLD (inst->v, 14, 12) == 0x2 | |
639 | && G_FLD (inst->v, 3, 0) == 0xe) | |
640 | { | |
641 | /* push! */ | |
642 | sp_offset += 4; | |
643 | ||
644 | if (G_FLD (inst->v, 11, 7) == 0x6 | |
645 | && ra_offset_p == 0) | |
646 | { | |
647 | /* push! r3, [r0] */ | |
648 | ra_offset = sp_offset; | |
649 | ra_offset_p = 1; | |
650 | } | |
651 | else if (G_FLD (inst->v, 11, 7) == 0x4 | |
652 | && fp_offset_p == 0) | |
653 | { | |
654 | /* push! r2, [r0] */ | |
655 | fp_offset = sp_offset; | |
656 | fp_offset_p = 1; | |
657 | } | |
658 | } | |
659 | else if (G_FLD (inst->v, 14, 12) == 0x2 | |
660 | && G_FLD (inst->v, 3, 0) == 0xa) | |
661 | { | |
662 | /* pop! */ | |
663 | sp_offset -= 4; | |
664 | } | |
665 | else if (G_FLD (inst->v, 14, 7) == 0xc1 | |
666 | && G_FLD (inst->v, 2, 0) == 0x0) | |
667 | { | |
668 | /* subei! r0, n */ | |
669 | sp_offset += (int) pow (2, G_FLD (inst->v, 6, 3)); | |
670 | } | |
671 | else if (G_FLD (inst->v, 14, 7) == 0xc0 | |
672 | && G_FLD (inst->v, 2, 0) == 0x0) | |
673 | { | |
674 | /* addei! r0, n */ | |
675 | sp_offset -= (int) pow (2, G_FLD (inst->v, 6, 3)); | |
676 | } | |
677 | } | |
678 | else | |
679 | { | |
680 | inst_len = SCORE_INSTLEN; | |
681 | ||
682 | if (G_FLD (inst->v, 29, 15) == 0xc60 | |
683 | && G_FLD (inst->v, 2, 0) == 0x4) | |
684 | { | |
685 | /* sw r3, [r0, offset]+ */ | |
686 | sp_offset += SCORE_INSTLEN; | |
687 | if (ra_offset_p == 0) | |
688 | { | |
689 | ra_offset = sp_offset; | |
690 | ra_offset_p = 1; | |
691 | } | |
692 | } | |
693 | if (G_FLD (inst->v, 29, 15) == 0xc40 | |
694 | && G_FLD (inst->v, 2, 0) == 0x4) | |
695 | { | |
696 | /* sw r2, [r0, offset]+ */ | |
697 | sp_offset += SCORE_INSTLEN; | |
698 | if (fp_offset_p == 0) | |
699 | { | |
700 | fp_offset = sp_offset; | |
701 | fp_offset_p = 1; | |
702 | } | |
703 | } | |
704 | else if (G_FLD (inst->v, 29, 15) == 0x1c60 | |
705 | && G_FLD (inst->v, 2, 0) == 0x0) | |
706 | { | |
707 | /* lw r3, [r0]+, 4 */ | |
708 | sp_offset -= SCORE_INSTLEN; | |
709 | ra_offset_p = 1; | |
710 | } | |
711 | else if (G_FLD (inst->v, 29, 15) == 0x1c40 | |
712 | && G_FLD (inst->v, 2, 0) == 0x0) | |
713 | { | |
714 | /* lw r2, [r0]+, 4 */ | |
715 | sp_offset -= SCORE_INSTLEN; | |
716 | fp_offset_p = 1; | |
717 | } | |
718 | ||
719 | else if (G_FLD (inst->v, 29, 17) == 0x100 | |
720 | && G_FLD (inst->v, 0, 0) == 0x0) | |
721 | { | |
722 | /* addi r0, -offset */ | |
723 | sp_offset += 65536 - G_FLD (inst->v, 16, 1); | |
724 | } | |
725 | else if (G_FLD (inst->v, 29, 17) == 0x110 | |
726 | && G_FLD (inst->v, 0, 0) == 0x0) | |
727 | { | |
728 | /* addi r2, offset */ | |
729 | if (pc - cur_pc > 4) | |
730 | { | |
731 | unsigned int save_v = inst->v; | |
732 | inst_t *inst2 = | |
733 | score_fetch_instruction (cur_pc + SCORE_INSTLEN); | |
734 | if (inst2->v == 0x23) | |
735 | /* mv! r0, r2 */ | |
736 | sp_offset -= G_FLD (save_v, 16, 1); | |
737 | } | |
738 | } | |
739 | } | |
740 | } | |
741 | ||
742 | /* Save RA. */ | |
743 | if (ra_offset_p == 1) | |
744 | { | |
745 | if (this_cache->saved_regs[SCORE_PC_REGNUM].addr == -1) | |
746 | this_cache->saved_regs[SCORE_PC_REGNUM].addr = | |
747 | sp + sp_offset - ra_offset; | |
748 | } | |
749 | else | |
750 | { | |
751 | this_cache->saved_regs[SCORE_PC_REGNUM] = | |
752 | this_cache->saved_regs[SCORE_RA_REGNUM]; | |
753 | } | |
754 | ||
755 | /* Save FP. */ | |
756 | if (fp_offset_p == 1) | |
757 | { | |
758 | if (this_cache->saved_regs[SCORE_FP_REGNUM].addr == -1) | |
759 | this_cache->saved_regs[SCORE_FP_REGNUM].addr = | |
760 | sp + sp_offset - fp_offset; | |
761 | } | |
762 | ||
763 | /* Save SP. */ | |
764 | this_cache->base = | |
765 | frame_unwind_register_unsigned (next_frame, SCORE_SP_REGNUM) + sp_offset; | |
766 | } | |
767 | ||
768 | static struct score_frame_cache * | |
769 | score_make_prologue_cache (struct frame_info *next_frame, void **this_cache) | |
770 | { | |
771 | struct score_frame_cache *cache; | |
772 | ||
773 | if ((*this_cache) != NULL) | |
774 | return (*this_cache); | |
775 | ||
776 | cache = FRAME_OBSTACK_ZALLOC (struct score_frame_cache); | |
777 | (*this_cache) = cache; | |
778 | cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); | |
779 | ||
780 | /* Analyze the prologue. */ | |
781 | { | |
782 | const CORE_ADDR pc = frame_pc_unwind (next_frame); | |
783 | CORE_ADDR start_addr; | |
784 | ||
785 | find_pc_partial_function (pc, NULL, &start_addr, NULL); | |
786 | if (start_addr == 0) | |
787 | return cache; | |
788 | score_analyze_prologue (start_addr, pc, next_frame, *this_cache); | |
789 | } | |
790 | ||
791 | /* Save SP. */ | |
792 | trad_frame_set_value (cache->saved_regs, SCORE_SP_REGNUM, cache->base); | |
793 | ||
794 | return (*this_cache); | |
795 | } | |
796 | ||
797 | static void | |
798 | score_prologue_this_id (struct frame_info *next_frame, void **this_cache, | |
799 | struct frame_id *this_id) | |
800 | { | |
801 | struct score_frame_cache *info = score_make_prologue_cache (next_frame, | |
802 | this_cache); | |
803 | (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame)); | |
804 | } | |
805 | ||
806 | static void | |
807 | score_prologue_prev_register (struct frame_info *next_frame, | |
808 | void **this_cache, | |
809 | int regnum, int *optimizedp, | |
810 | enum lval_type *lvalp, CORE_ADDR * addrp, | |
811 | int *realnump, gdb_byte * valuep) | |
812 | { | |
813 | struct score_frame_cache *info = score_make_prologue_cache (next_frame, | |
814 | this_cache); | |
815 | trad_frame_get_prev_register (next_frame, info->saved_regs, regnum, | |
816 | optimizedp, lvalp, addrp, realnump, valuep); | |
817 | } | |
818 | ||
819 | static const struct frame_unwind score_prologue_unwind = | |
820 | { | |
821 | NORMAL_FRAME, | |
822 | score_prologue_this_id, | |
823 | score_prologue_prev_register | |
824 | }; | |
825 | ||
826 | static const struct frame_unwind * | |
827 | score_prologue_sniffer (struct frame_info *next_frame) | |
828 | { | |
829 | return &score_prologue_unwind; | |
830 | } | |
831 | ||
832 | static CORE_ADDR | |
833 | score_prologue_frame_base_address (struct frame_info *next_frame, | |
834 | void **this_cache) | |
835 | { | |
836 | struct score_frame_cache *info = | |
837 | score_make_prologue_cache (next_frame, this_cache); | |
838 | return info->base; | |
839 | } | |
840 | ||
841 | static const struct frame_base score_prologue_frame_base = | |
842 | { | |
843 | &score_prologue_unwind, | |
844 | score_prologue_frame_base_address, | |
845 | score_prologue_frame_base_address, | |
846 | score_prologue_frame_base_address, | |
847 | }; | |
848 | ||
849 | static const struct frame_base * | |
850 | score_prologue_frame_base_sniffer (struct frame_info *next_frame) | |
851 | { | |
852 | return &score_prologue_frame_base; | |
853 | } | |
854 | ||
855 | static struct gdbarch * | |
856 | score_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
857 | { | |
858 | struct gdbarch *gdbarch; | |
859 | ||
860 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
861 | if (arches != NULL) | |
862 | { | |
863 | return (arches->gdbarch); | |
864 | } | |
865 | gdbarch = gdbarch_alloc (&info, 0); | |
866 | ||
867 | set_gdbarch_short_bit (gdbarch, 16); | |
868 | set_gdbarch_int_bit (gdbarch, 32); | |
869 | set_gdbarch_float_bit (gdbarch, 32); | |
870 | set_gdbarch_double_bit (gdbarch, 64); | |
871 | set_gdbarch_long_double_bit (gdbarch, 64); | |
872 | set_gdbarch_register_sim_regno (gdbarch, score_register_sim_regno); | |
873 | set_gdbarch_pc_regnum (gdbarch, SCORE_PC_REGNUM); | |
874 | set_gdbarch_sp_regnum (gdbarch, SCORE_SP_REGNUM); | |
875 | set_gdbarch_num_regs (gdbarch, SCORE_NUM_REGS); | |
876 | set_gdbarch_register_name (gdbarch, score_register_name); | |
877 | set_gdbarch_breakpoint_from_pc (gdbarch, score_breakpoint_from_pc); | |
878 | set_gdbarch_register_type (gdbarch, score_register_type); | |
879 | set_gdbarch_frame_align (gdbarch, score_frame_align); | |
880 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
881 | set_gdbarch_read_sp (gdbarch, score_read_sp); | |
882 | set_gdbarch_unwind_pc (gdbarch, score_unwind_pc); | |
883 | set_gdbarch_print_insn (gdbarch, score_print_insn); | |
884 | set_gdbarch_skip_prologue (gdbarch, score_skip_prologue); | |
885 | set_gdbarch_in_function_epilogue_p (gdbarch, score_in_function_epilogue_p); | |
886 | set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); | |
887 | set_gdbarch_return_value (gdbarch, score_return_value); | |
888 | set_gdbarch_unwind_dummy_id (gdbarch, score_unwind_dummy_id); | |
889 | set_gdbarch_push_dummy_call (gdbarch, score_push_dummy_call); | |
890 | ||
891 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
892 | frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer); | |
893 | frame_unwind_append_sniffer (gdbarch, score_prologue_sniffer); | |
894 | frame_base_append_sniffer (gdbarch, score_prologue_frame_base_sniffer); | |
895 | ||
896 | return gdbarch; | |
897 | } | |
898 | ||
899 | extern initialize_file_ftype _initialize_score_tdep; | |
900 | ||
901 | void | |
902 | _initialize_score_tdep (void) | |
903 | { | |
904 | gdbarch_register (bfd_arch_score, score_gdbarch_init, NULL); | |
905 | } |