Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. |
cda5a58a | 2 | |
464e0365 AC |
3 | Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free |
4 | Software Foundation, Inc. | |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
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. | |
c906108c | 12 | |
c5aa993b JM |
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. | |
c906108c | 17 | |
c5aa993b JM |
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. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "inferior.h" | |
c906108c SS |
26 | #include "target.h" |
27 | #include "value.h" | |
28 | #include "bfd.h" | |
29 | #include "gdb_string.h" | |
30 | #include "gdbcore.h" | |
9ab9195f | 31 | #include "objfiles.h" |
4e052eda | 32 | #include "regcache.h" |
ad8fe2ce | 33 | #include "arch-utils.h" |
bd1ce8ba | 34 | #include "gdb_assert.h" |
a89aa300 | 35 | #include "dis-asm.h" |
c906108c | 36 | |
6ca173e3 AC |
37 | #define D0_REGNUM 0 |
38 | #define D2_REGNUM 2 | |
39 | #define D3_REGNUM 3 | |
40 | #define A0_REGNUM 4 | |
41 | #define A2_REGNUM 6 | |
42 | #define A3_REGNUM 7 | |
43 | #define MDR_REGNUM 10 | |
44 | #define PSW_REGNUM 11 | |
45 | #define LIR_REGNUM 12 | |
46 | #define LAR_REGNUM 13 | |
47 | #define MDRQ_REGNUM 14 | |
48 | #define E0_REGNUM 15 | |
49 | #define MCRH_REGNUM 26 | |
50 | #define MCRL_REGNUM 27 | |
51 | #define MCVF_REGNUM 28 | |
52 | ||
53 | enum movm_register_bits { | |
54 | movm_exother_bit = 0x01, | |
55 | movm_exreg1_bit = 0x02, | |
56 | movm_exreg0_bit = 0x04, | |
57 | movm_other_bit = 0x08, | |
58 | movm_a3_bit = 0x10, | |
59 | movm_a2_bit = 0x20, | |
60 | movm_d3_bit = 0x40, | |
61 | movm_d2_bit = 0x80 | |
62 | }; | |
63 | ||
c2c6d25f | 64 | extern void _initialize_mn10300_tdep (void); |
a14ed312 KB |
65 | static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi, |
66 | CORE_ADDR pc); | |
c906108c | 67 | |
91225883 AC |
68 | /* mn10300 private data */ |
69 | struct gdbarch_tdep | |
70 | { | |
71 | int am33_mode; | |
72 | #define AM33_MODE (gdbarch_tdep (current_gdbarch)->am33_mode) | |
73 | }; | |
74 | ||
c906108c SS |
75 | /* Additional info used by the frame */ |
76 | ||
77 | struct frame_extra_info | |
c5aa993b JM |
78 | { |
79 | int status; | |
80 | int stack_size; | |
81 | }; | |
c906108c | 82 | |
0f71a2f6 | 83 | |
91225883 AC |
84 | static char * |
85 | register_name (int reg, char **regs, long sizeof_regs) | |
c2d11a7d | 86 | { |
91225883 AC |
87 | if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0])) |
88 | return NULL; | |
89 | else | |
90 | return regs[reg]; | |
91 | } | |
92 | ||
fa88f677 | 93 | static const char * |
91225883 | 94 | mn10300_generic_register_name (int reg) |
0f71a2f6 | 95 | { |
91225883 AC |
96 | static char *regs[] = |
97 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
98 | "sp", "pc", "mdr", "psw", "lir", "lar", "", "", | |
99 | "", "", "", "", "", "", "", "", | |
100 | "", "", "", "", "", "", "", "fp" | |
101 | }; | |
102 | return register_name (reg, regs, sizeof regs); | |
0f71a2f6 JM |
103 | } |
104 | ||
91225883 | 105 | |
fa88f677 | 106 | static const char * |
91225883 AC |
107 | am33_register_name (int reg) |
108 | { | |
109 | static char *regs[] = | |
110 | { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
111 | "sp", "pc", "mdr", "psw", "lir", "lar", "", | |
112 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
113 | "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", "" | |
114 | }; | |
115 | return register_name (reg, regs, sizeof regs); | |
116 | } | |
117 | ||
2ac51b36 | 118 | static CORE_ADDR |
fba45db2 | 119 | mn10300_saved_pc_after_call (struct frame_info *fi) |
0f71a2f6 JM |
120 | { |
121 | return read_memory_integer (read_register (SP_REGNUM), 4); | |
122 | } | |
123 | ||
c064f384 | 124 | static void |
d560a54b AO |
125 | mn10300_extract_return_value (struct gdbarch *gdbarch, struct type *type, |
126 | struct regcache *regcache, void *valbuf) | |
0f71a2f6 | 127 | { |
d560a54b AO |
128 | char buf[MAX_REGISTER_SIZE]; |
129 | int len = TYPE_LENGTH (type); | |
130 | int reg, regsz; | |
131 | ||
0f71a2f6 | 132 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
d560a54b | 133 | reg = 4; |
0f71a2f6 | 134 | else |
d560a54b AO |
135 | reg = 0; |
136 | ||
137 | regsz = register_size (gdbarch, reg); | |
138 | if (len <= regsz) | |
139 | { | |
140 | regcache_raw_read (regcache, reg, buf); | |
141 | memcpy (valbuf, buf, len); | |
142 | } | |
143 | else if (len <= 2 * regsz) | |
144 | { | |
145 | regcache_raw_read (regcache, reg, buf); | |
146 | memcpy (valbuf, buf, regsz); | |
147 | gdb_assert (regsz == register_size (gdbarch, reg + 1)); | |
148 | regcache_raw_read (regcache, reg + 1, buf); | |
149 | memcpy ((char *) valbuf + regsz, buf, len - regsz); | |
150 | } | |
151 | else | |
152 | internal_error (__FILE__, __LINE__, | |
153 | "Cannot extract return value %d bytes long.", len); | |
0f71a2f6 JM |
154 | } |
155 | ||
2ac51b36 | 156 | static void |
d560a54b AO |
157 | mn10300_store_return_value (struct gdbarch *gdbarch, struct type *type, |
158 | struct regcache *regcache, const void *valbuf) | |
0f71a2f6 | 159 | { |
d560a54b AO |
160 | int len = TYPE_LENGTH (type); |
161 | int reg, regsz; | |
162 | ||
0f71a2f6 | 163 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
d560a54b AO |
164 | reg = 4; |
165 | else | |
166 | reg = 0; | |
167 | ||
168 | regsz = register_size (gdbarch, reg); | |
169 | ||
170 | if (len <= regsz) | |
171 | regcache_raw_write_part (regcache, reg, 0, len, valbuf); | |
172 | else if (len <= 2 * regsz) | |
173 | { | |
174 | regcache_raw_write (regcache, reg, valbuf); | |
175 | gdb_assert (regsz == register_size (gdbarch, reg + 1)); | |
176 | regcache_raw_write_part (regcache, reg+1, 0, | |
177 | len - regsz, (char *) valbuf + regsz); | |
178 | } | |
0f71a2f6 | 179 | else |
d560a54b AO |
180 | internal_error (__FILE__, __LINE__, |
181 | "Cannot store return value %d bytes long.", len); | |
0f71a2f6 JM |
182 | } |
183 | ||
a14ed312 | 184 | static struct frame_info *analyze_dummy_frame (CORE_ADDR, CORE_ADDR); |
c906108c | 185 | static struct frame_info * |
fba45db2 | 186 | analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame) |
c906108c | 187 | { |
213cc0ad AC |
188 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
189 | struct frame_info *dummy | |
190 | = deprecated_frame_xmalloc_with_cleanup (SIZEOF_FRAME_SAVED_REGS, | |
191 | sizeof (struct frame_extra_info)); | |
50abf9e5 | 192 | deprecated_update_frame_pc_hack (dummy, pc); |
b0c6b05c | 193 | deprecated_update_frame_base_hack (dummy, frame); |
da50a4b7 AC |
194 | get_frame_extra_info (dummy)->status = 0; |
195 | get_frame_extra_info (dummy)->stack_size = 0; | |
f0d8db19 | 196 | mn10300_analyze_prologue (dummy, pc); |
213cc0ad | 197 | do_cleanups (old_chain); |
c906108c SS |
198 | return dummy; |
199 | } | |
200 | ||
201 | /* Values for frame_info.status */ | |
202 | ||
203 | #define MY_FRAME_IN_SP 0x1 | |
204 | #define MY_FRAME_IN_FP 0x2 | |
205 | #define NO_MORE_FRAMES 0x4 | |
206 | ||
d560a54b AO |
207 | /* Compute the alignment required by a type. */ |
208 | ||
209 | static int | |
210 | mn10300_type_align (struct type *type) | |
211 | { | |
212 | int i, align = 1; | |
213 | ||
214 | switch (TYPE_CODE (type)) | |
215 | { | |
216 | case TYPE_CODE_INT: | |
217 | case TYPE_CODE_ENUM: | |
218 | case TYPE_CODE_SET: | |
219 | case TYPE_CODE_RANGE: | |
220 | case TYPE_CODE_CHAR: | |
221 | case TYPE_CODE_BOOL: | |
222 | case TYPE_CODE_FLT: | |
223 | case TYPE_CODE_PTR: | |
224 | case TYPE_CODE_REF: | |
225 | return TYPE_LENGTH (type); | |
226 | ||
227 | case TYPE_CODE_COMPLEX: | |
228 | return TYPE_LENGTH (type) / 2; | |
229 | ||
230 | case TYPE_CODE_STRUCT: | |
231 | case TYPE_CODE_UNION: | |
232 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
233 | { | |
234 | int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i)); | |
235 | while (align < falign) | |
236 | align <<= 1; | |
237 | } | |
238 | return align; | |
239 | ||
240 | case TYPE_CODE_ARRAY: | |
241 | /* HACK! Structures containing arrays, even small ones, are not | |
242 | elligible for returning in registers. */ | |
243 | return 256; | |
244 | ||
245 | case TYPE_CODE_TYPEDEF: | |
246 | return mn10300_type_align (check_typedef (type)); | |
247 | ||
248 | default: | |
249 | abort (); | |
250 | } | |
251 | } | |
c906108c SS |
252 | |
253 | /* Should call_function allocate stack space for a struct return? */ | |
2ac51b36 | 254 | static int |
d560a54b AO |
255 | mn10300_use_struct_convention (struct type *type) |
256 | { | |
257 | /* Structures bigger than a pair of words can't be returned in | |
258 | registers. */ | |
259 | if (TYPE_LENGTH (type) > 8) | |
260 | return 1; | |
261 | ||
262 | switch (TYPE_CODE (type)) | |
263 | { | |
264 | case TYPE_CODE_STRUCT: | |
265 | case TYPE_CODE_UNION: | |
266 | /* Structures with a single field are handled as the field | |
267 | itself. */ | |
268 | if (TYPE_NFIELDS (type) == 1) | |
269 | return mn10300_use_struct_convention (TYPE_FIELD_TYPE (type, 0)); | |
270 | ||
271 | /* Structures with word or double-word size are passed in memory, as | |
272 | long as they require at least word alignment. */ | |
273 | if (mn10300_type_align (type) >= 4) | |
274 | return 0; | |
275 | ||
276 | return 1; | |
277 | ||
278 | /* Arrays are addressable, so they're never returned in | |
279 | registers. This condition can only hold when the array is | |
280 | the only field of a struct or union. */ | |
281 | case TYPE_CODE_ARRAY: | |
282 | return 1; | |
283 | ||
284 | case TYPE_CODE_TYPEDEF: | |
285 | return mn10300_use_struct_convention (check_typedef (type)); | |
286 | ||
287 | default: | |
288 | return 0; | |
289 | } | |
290 | } | |
291 | ||
292 | /* Determine, for architecture GDBARCH, how a return value of TYPE | |
293 | should be returned. If it is supposed to be returned in registers, | |
294 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
295 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
296 | from WRITEBUF into REGCACHE. */ | |
297 | ||
298 | static enum return_value_convention | |
299 | mn10300_return_value (struct gdbarch *gdbarch, struct type *type, | |
300 | struct regcache *regcache, void *readbuf, | |
301 | const void *writebuf) | |
c906108c | 302 | { |
d560a54b AO |
303 | if (mn10300_use_struct_convention (type)) |
304 | return RETURN_VALUE_STRUCT_CONVENTION; | |
305 | ||
306 | if (readbuf) | |
307 | mn10300_extract_return_value (gdbarch, type, regcache, readbuf); | |
308 | if (writebuf) | |
309 | mn10300_store_return_value (gdbarch, type, regcache, writebuf); | |
310 | ||
311 | return RETURN_VALUE_REGISTER_CONVENTION; | |
c906108c SS |
312 | } |
313 | ||
314 | /* The breakpoint instruction must be the same size as the smallest | |
315 | instruction in the instruction set. | |
316 | ||
317 | The Matsushita mn10x00 processors have single byte instructions | |
318 | so we need a single byte breakpoint. Matsushita hasn't defined | |
319 | one, so we defined it ourselves. */ | |
320 | ||
f4f9705a | 321 | const static unsigned char * |
fba45db2 | 322 | mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size) |
c906108c | 323 | { |
c5aa993b JM |
324 | static char breakpoint[] = |
325 | {0xff}; | |
c906108c SS |
326 | *bp_size = 1; |
327 | return breakpoint; | |
328 | } | |
329 | ||
330 | ||
331 | /* Fix fi->frame if it's bogus at this point. This is a helper | |
332 | function for mn10300_analyze_prologue. */ | |
333 | ||
334 | static void | |
fba45db2 | 335 | fix_frame_pointer (struct frame_info *fi, int stack_size) |
c906108c | 336 | { |
11c02a10 | 337 | if (fi && get_next_frame (fi) == NULL) |
c906108c | 338 | { |
da50a4b7 | 339 | if (get_frame_extra_info (fi)->status & MY_FRAME_IN_SP) |
b0c6b05c | 340 | deprecated_update_frame_base_hack (fi, read_sp () - stack_size); |
da50a4b7 | 341 | else if (get_frame_extra_info (fi)->status & MY_FRAME_IN_FP) |
b0c6b05c | 342 | deprecated_update_frame_base_hack (fi, read_register (A3_REGNUM)); |
c906108c SS |
343 | } |
344 | } | |
345 | ||
346 | ||
347 | /* Set offsets of registers saved by movm instruction. | |
348 | This is a helper function for mn10300_analyze_prologue. */ | |
349 | ||
350 | static void | |
fba45db2 | 351 | set_movm_offsets (struct frame_info *fi, int movm_args) |
c906108c SS |
352 | { |
353 | int offset = 0; | |
354 | ||
355 | if (fi == NULL || movm_args == 0) | |
356 | return; | |
357 | ||
ae83b20d JB |
358 | if (movm_args & movm_other_bit) |
359 | { | |
360 | /* The `other' bit leaves a blank area of four bytes at the | |
361 | beginning of its block of saved registers, making it 32 bytes | |
362 | long in total. */ | |
1b1d3794 AC |
363 | deprecated_get_frame_saved_regs (fi)[LAR_REGNUM] = get_frame_base (fi) + offset + 4; |
364 | deprecated_get_frame_saved_regs (fi)[LIR_REGNUM] = get_frame_base (fi) + offset + 8; | |
365 | deprecated_get_frame_saved_regs (fi)[MDR_REGNUM] = get_frame_base (fi) + offset + 12; | |
366 | deprecated_get_frame_saved_regs (fi)[A0_REGNUM + 1] = get_frame_base (fi) + offset + 16; | |
367 | deprecated_get_frame_saved_regs (fi)[A0_REGNUM] = get_frame_base (fi) + offset + 20; | |
368 | deprecated_get_frame_saved_regs (fi)[D0_REGNUM + 1] = get_frame_base (fi) + offset + 24; | |
369 | deprecated_get_frame_saved_regs (fi)[D0_REGNUM] = get_frame_base (fi) + offset + 28; | |
ae83b20d JB |
370 | offset += 32; |
371 | } | |
372 | if (movm_args & movm_a3_bit) | |
c906108c | 373 | { |
1b1d3794 | 374 | deprecated_get_frame_saved_regs (fi)[A3_REGNUM] = get_frame_base (fi) + offset; |
c906108c SS |
375 | offset += 4; |
376 | } | |
ae83b20d | 377 | if (movm_args & movm_a2_bit) |
c906108c | 378 | { |
1b1d3794 | 379 | deprecated_get_frame_saved_regs (fi)[A2_REGNUM] = get_frame_base (fi) + offset; |
c906108c SS |
380 | offset += 4; |
381 | } | |
ae83b20d | 382 | if (movm_args & movm_d3_bit) |
c906108c | 383 | { |
1b1d3794 | 384 | deprecated_get_frame_saved_regs (fi)[D3_REGNUM] = get_frame_base (fi) + offset; |
c906108c SS |
385 | offset += 4; |
386 | } | |
ae83b20d | 387 | if (movm_args & movm_d2_bit) |
c906108c | 388 | { |
1b1d3794 | 389 | deprecated_get_frame_saved_regs (fi)[D2_REGNUM] = get_frame_base (fi) + offset; |
c906108c SS |
390 | offset += 4; |
391 | } | |
ae83b20d | 392 | if (AM33_MODE) |
c2d11a7d | 393 | { |
ae83b20d JB |
394 | if (movm_args & movm_exother_bit) |
395 | { | |
1b1d3794 AC |
396 | deprecated_get_frame_saved_regs (fi)[MCVF_REGNUM] = get_frame_base (fi) + offset; |
397 | deprecated_get_frame_saved_regs (fi)[MCRL_REGNUM] = get_frame_base (fi) + offset + 4; | |
398 | deprecated_get_frame_saved_regs (fi)[MCRH_REGNUM] = get_frame_base (fi) + offset + 8; | |
399 | deprecated_get_frame_saved_regs (fi)[MDRQ_REGNUM] = get_frame_base (fi) + offset + 12; | |
400 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 1] = get_frame_base (fi) + offset + 16; | |
401 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 0] = get_frame_base (fi) + offset + 20; | |
ae83b20d JB |
402 | offset += 24; |
403 | } | |
404 | if (movm_args & movm_exreg1_bit) | |
405 | { | |
1b1d3794 AC |
406 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 7] = get_frame_base (fi) + offset; |
407 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 6] = get_frame_base (fi) + offset + 4; | |
408 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 5] = get_frame_base (fi) + offset + 8; | |
409 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 4] = get_frame_base (fi) + offset + 12; | |
ae83b20d JB |
410 | offset += 16; |
411 | } | |
412 | if (movm_args & movm_exreg0_bit) | |
413 | { | |
1b1d3794 AC |
414 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 3] = get_frame_base (fi) + offset; |
415 | deprecated_get_frame_saved_regs (fi)[E0_REGNUM + 2] = get_frame_base (fi) + offset + 4; | |
ae83b20d JB |
416 | offset += 8; |
417 | } | |
c2d11a7d | 418 | } |
c906108c SS |
419 | } |
420 | ||
421 | ||
422 | /* The main purpose of this file is dealing with prologues to extract | |
423 | information about stack frames and saved registers. | |
424 | ||
4eab1e18 JB |
425 | In gcc/config/mn13000/mn10300.c, the expand_prologue prologue |
426 | function is pretty readable, and has a nice explanation of how the | |
427 | prologue is generated. The prologues generated by that code will | |
03a0cf8a JB |
428 | have the following form (NOTE: the current code doesn't handle all |
429 | this!): | |
c906108c | 430 | |
4eab1e18 JB |
431 | + If this is an old-style varargs function, then its arguments |
432 | need to be flushed back to the stack: | |
433 | ||
434 | mov d0,(4,sp) | |
435 | mov d1,(4,sp) | |
c906108c | 436 | |
4eab1e18 JB |
437 | + If we use any of the callee-saved registers, save them now. |
438 | ||
439 | movm [some callee-saved registers],(sp) | |
440 | ||
441 | + If we have any floating-point registers to save: | |
442 | ||
443 | - Decrement the stack pointer to reserve space for the registers. | |
444 | If the function doesn't need a frame pointer, we may combine | |
445 | this with the adjustment that reserves space for the frame. | |
446 | ||
447 | add -SIZE, sp | |
448 | ||
449 | - Save the floating-point registers. We have two possible | |
450 | strategies: | |
451 | ||
452 | . Save them at fixed offset from the SP: | |
453 | ||
454 | fmov fsN,(OFFSETN,sp) | |
455 | fmov fsM,(OFFSETM,sp) | |
456 | ... | |
457 | ||
03a0cf8a JB |
458 | Note that, if OFFSETN happens to be zero, you'll get the |
459 | different opcode: fmov fsN,(sp) | |
460 | ||
4eab1e18 JB |
461 | . Or, set a0 to the start of the save area, and then use |
462 | post-increment addressing to save the FP registers. | |
463 | ||
464 | mov sp, a0 | |
465 | add SIZE, a0 | |
466 | fmov fsN,(a0+) | |
467 | fmov fsM,(a0+) | |
468 | ... | |
469 | ||
470 | + If the function needs a frame pointer, we set it here. | |
471 | ||
472 | mov sp, a3 | |
473 | ||
474 | + Now we reserve space for the stack frame proper. This could be | |
475 | merged into the `add -SIZE, sp' instruction for FP saves up | |
476 | above, unless we needed to set the frame pointer in the previous | |
477 | step, or the frame is so large that allocating the whole thing at | |
478 | once would put the FP register save slots out of reach of the | |
479 | addressing mode (128 bytes). | |
480 | ||
481 | add -SIZE, sp | |
c906108c SS |
482 | |
483 | One day we might keep the stack pointer constant, that won't | |
484 | change the code for prologues, but it will make the frame | |
485 | pointerless case much more common. */ | |
c5aa993b | 486 | |
c906108c SS |
487 | /* Analyze the prologue to determine where registers are saved, |
488 | the end of the prologue, etc etc. Return the end of the prologue | |
489 | scanned. | |
490 | ||
491 | We store into FI (if non-null) several tidbits of information: | |
492 | ||
c5aa993b JM |
493 | * stack_size -- size of this stack frame. Note that if we stop in |
494 | certain parts of the prologue/epilogue we may claim the size of the | |
495 | current frame is zero. This happens when the current frame has | |
496 | not been allocated yet or has already been deallocated. | |
c906108c | 497 | |
c5aa993b | 498 | * fsr -- Addresses of registers saved in the stack by this frame. |
c906108c | 499 | |
c5aa993b JM |
500 | * status -- A (relatively) generic status indicator. It's a bitmask |
501 | with the following bits: | |
c906108c | 502 | |
c5aa993b JM |
503 | MY_FRAME_IN_SP: The base of the current frame is actually in |
504 | the stack pointer. This can happen for frame pointerless | |
505 | functions, or cases where we're stopped in the prologue/epilogue | |
506 | itself. For these cases mn10300_analyze_prologue will need up | |
507 | update fi->frame before returning or analyzing the register | |
508 | save instructions. | |
c906108c | 509 | |
c5aa993b | 510 | MY_FRAME_IN_FP: The base of the current frame is in the |
4eab1e18 | 511 | frame pointer register ($a3). |
c906108c | 512 | |
c5aa993b JM |
513 | NO_MORE_FRAMES: Set this if the current frame is "start" or |
514 | if the first instruction looks like mov <imm>,sp. This tells | |
515 | frame chain to not bother trying to unwind past this frame. */ | |
c906108c SS |
516 | |
517 | static CORE_ADDR | |
fba45db2 | 518 | mn10300_analyze_prologue (struct frame_info *fi, CORE_ADDR pc) |
c906108c SS |
519 | { |
520 | CORE_ADDR func_addr, func_end, addr, stop; | |
521 | CORE_ADDR stack_size; | |
522 | int imm_size; | |
523 | unsigned char buf[4]; | |
524 | int status, movm_args = 0; | |
525 | char *name; | |
526 | ||
527 | /* Use the PC in the frame if it's provided to look up the | |
f0d8db19 KB |
528 | start of this function. |
529 | ||
530 | Note: kevinb/2003-07-16: We used to do the following here: | |
531 | pc = (fi ? get_frame_pc (fi) : pc); | |
532 | But this is (now) badly broken when called from analyze_dummy_frame(). | |
533 | */ | |
534 | pc = (pc ? pc : get_frame_pc (fi)); | |
c906108c SS |
535 | |
536 | /* Find the start of this function. */ | |
537 | status = find_pc_partial_function (pc, &name, &func_addr, &func_end); | |
538 | ||
539 | /* Do nothing if we couldn't find the start of this function or if we're | |
540 | stopped at the first instruction in the prologue. */ | |
541 | if (status == 0) | |
43ff13b4 JM |
542 | { |
543 | return pc; | |
544 | } | |
c906108c SS |
545 | |
546 | /* If we're in start, then give up. */ | |
547 | if (strcmp (name, "start") == 0) | |
548 | { | |
549 | if (fi != NULL) | |
da50a4b7 | 550 | get_frame_extra_info (fi)->status = NO_MORE_FRAMES; |
c906108c SS |
551 | return pc; |
552 | } | |
553 | ||
554 | /* At the start of a function our frame is in the stack pointer. */ | |
555 | if (fi) | |
da50a4b7 | 556 | get_frame_extra_info (fi)->status = MY_FRAME_IN_SP; |
c906108c SS |
557 | |
558 | /* Get the next two bytes into buf, we need two because rets is a two | |
559 | byte insn and the first isn't enough to uniquely identify it. */ | |
560 | status = read_memory_nobpt (pc, buf, 2); | |
561 | if (status != 0) | |
562 | return pc; | |
563 | ||
f0d8db19 KB |
564 | #if 0 |
565 | /* Note: kevinb/2003-07-16: We shouldn't be making these sorts of | |
566 | changes to the frame in prologue examination code. */ | |
c906108c SS |
567 | /* If we're physically on an "rets" instruction, then our frame has |
568 | already been deallocated. Note this can also be true for retf | |
569 | and ret if they specify a size of zero. | |
570 | ||
571 | In this case fi->frame is bogus, we need to fix it. */ | |
572 | if (fi && buf[0] == 0xf0 && buf[1] == 0xfc) | |
573 | { | |
11c02a10 | 574 | if (get_next_frame (fi) == NULL) |
b0c6b05c | 575 | deprecated_update_frame_base_hack (fi, read_sp ()); |
50abf9e5 | 576 | return get_frame_pc (fi); |
c906108c SS |
577 | } |
578 | ||
579 | /* Similarly if we're stopped on the first insn of a prologue as our | |
580 | frame hasn't been allocated yet. */ | |
50abf9e5 | 581 | if (fi && get_frame_pc (fi) == func_addr) |
c906108c | 582 | { |
11c02a10 | 583 | if (get_next_frame (fi) == NULL) |
b0c6b05c | 584 | deprecated_update_frame_base_hack (fi, read_sp ()); |
50abf9e5 | 585 | return get_frame_pc (fi); |
c906108c | 586 | } |
f0d8db19 | 587 | #endif |
c906108c SS |
588 | |
589 | /* Figure out where to stop scanning. */ | |
f0d8db19 | 590 | stop = fi ? pc : func_end; |
c906108c SS |
591 | |
592 | /* Don't walk off the end of the function. */ | |
593 | stop = stop > func_end ? func_end : stop; | |
594 | ||
595 | /* Start scanning on the first instruction of this function. */ | |
596 | addr = func_addr; | |
597 | ||
598 | /* Suck in two bytes. */ | |
a72fbdb7 AO |
599 | if (addr + 2 >= stop |
600 | || (status = read_memory_nobpt (addr, buf, 2)) != 0) | |
c906108c SS |
601 | { |
602 | fix_frame_pointer (fi, 0); | |
603 | return addr; | |
604 | } | |
605 | ||
4eab1e18 JB |
606 | /* First see if this insn sets the stack pointer from a register; if |
607 | so, it's probably the initialization of the stack pointer in _start, | |
608 | so mark this as the bottom-most frame. */ | |
c906108c SS |
609 | if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0) |
610 | { | |
611 | if (fi) | |
da50a4b7 | 612 | get_frame_extra_info (fi)->status = NO_MORE_FRAMES; |
c906108c SS |
613 | return addr; |
614 | } | |
615 | ||
616 | /* Now look for movm [regs],sp, which saves the callee saved registers. | |
617 | ||
618 | At this time we don't know if fi->frame is valid, so we only note | |
619 | that we encountered a movm instruction. Later, we'll set the entries | |
620 | in fsr.regs as needed. */ | |
621 | if (buf[0] == 0xcf) | |
622 | { | |
623 | /* Extract the register list for the movm instruction. */ | |
624 | status = read_memory_nobpt (addr + 1, buf, 1); | |
625 | movm_args = *buf; | |
626 | ||
627 | addr += 2; | |
628 | ||
629 | /* Quit now if we're beyond the stop point. */ | |
630 | if (addr >= stop) | |
631 | { | |
632 | /* Fix fi->frame since it's bogus at this point. */ | |
11c02a10 | 633 | if (fi && get_next_frame (fi) == NULL) |
b0c6b05c | 634 | deprecated_update_frame_base_hack (fi, read_sp ()); |
c906108c SS |
635 | |
636 | /* Note if/where callee saved registers were saved. */ | |
637 | set_movm_offsets (fi, movm_args); | |
638 | return addr; | |
639 | } | |
640 | ||
641 | /* Get the next two bytes so the prologue scan can continue. */ | |
642 | status = read_memory_nobpt (addr, buf, 2); | |
643 | if (status != 0) | |
644 | { | |
645 | /* Fix fi->frame since it's bogus at this point. */ | |
11c02a10 | 646 | if (fi && get_next_frame (fi) == NULL) |
b0c6b05c | 647 | deprecated_update_frame_base_hack (fi, read_sp ()); |
c906108c SS |
648 | |
649 | /* Note if/where callee saved registers were saved. */ | |
650 | set_movm_offsets (fi, movm_args); | |
651 | return addr; | |
652 | } | |
653 | } | |
654 | ||
655 | /* Now see if we set up a frame pointer via "mov sp,a3" */ | |
656 | if (buf[0] == 0x3f) | |
657 | { | |
658 | addr += 1; | |
659 | ||
660 | /* The frame pointer is now valid. */ | |
661 | if (fi) | |
662 | { | |
da50a4b7 AC |
663 | get_frame_extra_info (fi)->status |= MY_FRAME_IN_FP; |
664 | get_frame_extra_info (fi)->status &= ~MY_FRAME_IN_SP; | |
c906108c SS |
665 | } |
666 | ||
667 | /* Quit now if we're beyond the stop point. */ | |
668 | if (addr >= stop) | |
669 | { | |
670 | /* Fix fi->frame if it's bogus at this point. */ | |
671 | fix_frame_pointer (fi, 0); | |
672 | ||
673 | /* Note if/where callee saved registers were saved. */ | |
674 | set_movm_offsets (fi, movm_args); | |
675 | return addr; | |
676 | } | |
677 | ||
678 | /* Get two more bytes so scanning can continue. */ | |
679 | status = read_memory_nobpt (addr, buf, 2); | |
680 | if (status != 0) | |
681 | { | |
682 | /* Fix fi->frame if it's bogus at this point. */ | |
683 | fix_frame_pointer (fi, 0); | |
684 | ||
685 | /* Note if/where callee saved registers were saved. */ | |
686 | set_movm_offsets (fi, movm_args); | |
687 | return addr; | |
688 | } | |
689 | } | |
c5aa993b | 690 | |
c906108c SS |
691 | /* Next we should allocate the local frame. No more prologue insns |
692 | are found after allocating the local frame. | |
c5aa993b | 693 | |
c906108c | 694 | Search for add imm8,sp (0xf8feXX) |
c5aa993b JM |
695 | or add imm16,sp (0xfafeXXXX) |
696 | or add imm32,sp (0xfcfeXXXXXXXX). | |
697 | ||
c906108c SS |
698 | If none of the above was found, then this prologue has no |
699 | additional stack. */ | |
700 | ||
701 | status = read_memory_nobpt (addr, buf, 2); | |
702 | if (status != 0) | |
703 | { | |
704 | /* Fix fi->frame if it's bogus at this point. */ | |
705 | fix_frame_pointer (fi, 0); | |
706 | ||
707 | /* Note if/where callee saved registers were saved. */ | |
708 | set_movm_offsets (fi, movm_args); | |
709 | return addr; | |
710 | } | |
711 | ||
712 | imm_size = 0; | |
713 | if (buf[0] == 0xf8 && buf[1] == 0xfe) | |
714 | imm_size = 1; | |
715 | else if (buf[0] == 0xfa && buf[1] == 0xfe) | |
716 | imm_size = 2; | |
717 | else if (buf[0] == 0xfc && buf[1] == 0xfe) | |
718 | imm_size = 4; | |
719 | ||
720 | if (imm_size != 0) | |
721 | { | |
722 | /* Suck in imm_size more bytes, they'll hold the size of the | |
723 | current frame. */ | |
724 | status = read_memory_nobpt (addr + 2, buf, imm_size); | |
725 | if (status != 0) | |
726 | { | |
727 | /* Fix fi->frame if it's bogus at this point. */ | |
728 | fix_frame_pointer (fi, 0); | |
729 | ||
730 | /* Note if/where callee saved registers were saved. */ | |
731 | set_movm_offsets (fi, movm_args); | |
732 | return addr; | |
733 | } | |
734 | ||
735 | /* Note the size of the stack in the frame info structure. */ | |
736 | stack_size = extract_signed_integer (buf, imm_size); | |
737 | if (fi) | |
da50a4b7 | 738 | get_frame_extra_info (fi)->stack_size = stack_size; |
c906108c SS |
739 | |
740 | /* We just consumed 2 + imm_size bytes. */ | |
741 | addr += 2 + imm_size; | |
742 | ||
743 | /* No more prologue insns follow, so begin preparation to return. */ | |
744 | /* Fix fi->frame if it's bogus at this point. */ | |
745 | fix_frame_pointer (fi, stack_size); | |
746 | ||
747 | /* Note if/where callee saved registers were saved. */ | |
748 | set_movm_offsets (fi, movm_args); | |
749 | return addr; | |
750 | } | |
751 | ||
752 | /* We never found an insn which allocates local stack space, regardless | |
753 | this is the end of the prologue. */ | |
754 | /* Fix fi->frame if it's bogus at this point. */ | |
755 | fix_frame_pointer (fi, 0); | |
756 | ||
757 | /* Note if/where callee saved registers were saved. */ | |
758 | set_movm_offsets (fi, movm_args); | |
759 | return addr; | |
760 | } | |
c5aa993b | 761 | |
ae83b20d JB |
762 | |
763 | /* Function: saved_regs_size | |
764 | Return the size in bytes of the register save area, based on the | |
765 | saved_regs array in FI. */ | |
766 | static int | |
767 | saved_regs_size (struct frame_info *fi) | |
768 | { | |
769 | int adjust = 0; | |
770 | int i; | |
771 | ||
772 | /* Reserve four bytes for every register saved. */ | |
773 | for (i = 0; i < NUM_REGS; i++) | |
1b1d3794 | 774 | if (deprecated_get_frame_saved_regs (fi)[i]) |
ae83b20d JB |
775 | adjust += 4; |
776 | ||
777 | /* If we saved LIR, then it's most likely we used a `movm' | |
778 | instruction with the `other' bit set, in which case the SP is | |
779 | decremented by an extra four bytes, "to simplify calculation | |
780 | of the transfer area", according to the processor manual. */ | |
1b1d3794 | 781 | if (deprecated_get_frame_saved_regs (fi)[LIR_REGNUM]) |
ae83b20d JB |
782 | adjust += 4; |
783 | ||
784 | return adjust; | |
785 | } | |
786 | ||
787 | ||
c906108c SS |
788 | /* Function: frame_chain |
789 | Figure out and return the caller's frame pointer given current | |
790 | frame_info struct. | |
791 | ||
792 | We don't handle dummy frames yet but we would probably just return the | |
793 | stack pointer that was in use at the time the function call was made? */ | |
794 | ||
2ac51b36 | 795 | static CORE_ADDR |
fba45db2 | 796 | mn10300_frame_chain (struct frame_info *fi) |
c906108c SS |
797 | { |
798 | struct frame_info *dummy; | |
799 | /* Walk through the prologue to determine the stack size, | |
800 | location of saved registers, end of the prologue, etc. */ | |
da50a4b7 | 801 | if (get_frame_extra_info (fi)->status == 0) |
c5aa993b | 802 | mn10300_analyze_prologue (fi, (CORE_ADDR) 0); |
c906108c SS |
803 | |
804 | /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */ | |
da50a4b7 | 805 | if (get_frame_extra_info (fi)->status & NO_MORE_FRAMES) |
c906108c SS |
806 | return 0; |
807 | ||
808 | /* Now that we've analyzed our prologue, determine the frame | |
809 | pointer for our caller. | |
810 | ||
c5aa993b JM |
811 | If our caller has a frame pointer, then we need to |
812 | find the entry value of $a3 to our function. | |
813 | ||
814 | If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory | |
815 | location pointed to by fsr.regs[A3_REGNUM]. | |
c906108c | 816 | |
c5aa993b | 817 | Else it's still in $a3. |
c906108c | 818 | |
c5aa993b JM |
819 | If our caller does not have a frame pointer, then his |
820 | frame base is fi->frame + -caller's stack size. */ | |
c906108c | 821 | |
c906108c SS |
822 | /* The easiest way to get that info is to analyze our caller's frame. |
823 | So we set up a dummy frame and call mn10300_analyze_prologue to | |
824 | find stuff for us. */ | |
8bedc050 | 825 | dummy = analyze_dummy_frame (DEPRECATED_FRAME_SAVED_PC (fi), get_frame_base (fi)); |
c906108c | 826 | |
da50a4b7 | 827 | if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_FP) |
c906108c SS |
828 | { |
829 | /* Our caller has a frame pointer. So find the frame in $a3 or | |
830 | in the stack. */ | |
1b1d3794 AC |
831 | if (deprecated_get_frame_saved_regs (fi)[A3_REGNUM]) |
832 | return (read_memory_integer (deprecated_get_frame_saved_regs (fi)[A3_REGNUM], | |
b1e29e33 | 833 | DEPRECATED_REGISTER_SIZE)); |
c906108c SS |
834 | else |
835 | return read_register (A3_REGNUM); | |
836 | } | |
837 | else | |
838 | { | |
ae83b20d | 839 | int adjust = saved_regs_size (fi); |
c906108c SS |
840 | |
841 | /* Our caller does not have a frame pointer. So his frame starts | |
c5aa993b JM |
842 | at the base of our frame (fi->frame) + register save space |
843 | + <his size>. */ | |
da50a4b7 | 844 | return get_frame_base (fi) + adjust + -get_frame_extra_info (dummy)->stack_size; |
c906108c SS |
845 | } |
846 | } | |
847 | ||
848 | /* Function: skip_prologue | |
849 | Return the address of the first inst past the prologue of the function. */ | |
850 | ||
2ac51b36 | 851 | static CORE_ADDR |
fba45db2 | 852 | mn10300_skip_prologue (CORE_ADDR pc) |
c906108c SS |
853 | { |
854 | /* We used to check the debug symbols, but that can lose if | |
855 | we have a null prologue. */ | |
856 | return mn10300_analyze_prologue (NULL, pc); | |
857 | } | |
858 | ||
ee9f9641 JB |
859 | /* generic_pop_current_frame calls this function if the current |
860 | frame isn't a dummy frame. */ | |
861 | static void | |
862 | mn10300_pop_frame_regular (struct frame_info *frame) | |
c906108c SS |
863 | { |
864 | int regnum; | |
865 | ||
8bedc050 | 866 | write_register (PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame)); |
c906108c | 867 | |
ee9f9641 JB |
868 | /* Restore any saved registers. */ |
869 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
1b1d3794 | 870 | if (deprecated_get_frame_saved_regs (frame)[regnum] != 0) |
ee9f9641 JB |
871 | { |
872 | ULONGEST value; | |
c906108c | 873 | |
1b1d3794 | 874 | value = read_memory_unsigned_integer (deprecated_get_frame_saved_regs (frame)[regnum], |
12c266ea | 875 | DEPRECATED_REGISTER_RAW_SIZE (regnum)); |
ee9f9641 JB |
876 | write_register (regnum, value); |
877 | } | |
c906108c | 878 | |
d560a54b AO |
879 | /* Actually cut back the stack, adjusted by the saved registers like |
880 | ret would. */ | |
881 | write_register (SP_REGNUM, get_frame_base (frame) + saved_regs_size (frame)); | |
ee9f9641 JB |
882 | } |
883 | ||
884 | /* Function: pop_frame | |
885 | This routine gets called when either the user uses the `return' | |
886 | command, or the call dummy breakpoint gets hit. */ | |
887 | static void | |
888 | mn10300_pop_frame (void) | |
889 | { | |
8adf9e78 AC |
890 | struct frame_info *frame = get_current_frame (); |
891 | if (get_frame_type (frame) == DUMMY_FRAME) | |
892 | /* NOTE: cagney/2002-22-23: Does this ever occure? Surely a dummy | |
893 | frame will have already been poped by the "infrun.c" code. */ | |
894 | deprecated_pop_dummy_frame (); | |
895 | else | |
896 | mn10300_pop_frame_regular (frame); | |
c906108c SS |
897 | /* Throw away any cached frame information. */ |
898 | flush_cached_frames (); | |
899 | } | |
900 | ||
901 | /* Function: push_arguments | |
902 | Setup arguments for a call to the target. Arguments go in | |
903 | order on the stack. */ | |
904 | ||
2ac51b36 | 905 | static CORE_ADDR |
91225883 AC |
906 | mn10300_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
907 | int struct_return, CORE_ADDR struct_addr) | |
c906108c SS |
908 | { |
909 | int argnum = 0; | |
910 | int len = 0; | |
911 | int stack_offset = 0; | |
912 | int regsused = struct_return ? 1 : 0; | |
913 | ||
914 | /* This should be a nop, but align the stack just in case something | |
915 | went wrong. Stacks are four byte aligned on the mn10300. */ | |
916 | sp &= ~3; | |
917 | ||
918 | /* Now make space on the stack for the args. | |
919 | ||
920 | XXX This doesn't appear to handle pass-by-invisible reference | |
921 | arguments. */ | |
922 | for (argnum = 0; argnum < nargs; argnum++) | |
923 | { | |
924 | int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3; | |
925 | ||
926 | while (regsused < 2 && arg_length > 0) | |
927 | { | |
928 | regsused++; | |
929 | arg_length -= 4; | |
930 | } | |
931 | len += arg_length; | |
932 | } | |
933 | ||
934 | /* Allocate stack space. */ | |
935 | sp -= len; | |
936 | ||
937 | regsused = struct_return ? 1 : 0; | |
938 | /* Push all arguments onto the stack. */ | |
939 | for (argnum = 0; argnum < nargs; argnum++) | |
940 | { | |
941 | int len; | |
942 | char *val; | |
943 | ||
944 | /* XXX Check this. What about UNIONS? */ | |
945 | if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT | |
946 | && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) | |
947 | { | |
948 | /* XXX Wrong, we want a pointer to this argument. */ | |
c5aa993b JM |
949 | len = TYPE_LENGTH (VALUE_TYPE (*args)); |
950 | val = (char *) VALUE_CONTENTS (*args); | |
c906108c SS |
951 | } |
952 | else | |
953 | { | |
954 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
c5aa993b | 955 | val = (char *) VALUE_CONTENTS (*args); |
c906108c SS |
956 | } |
957 | ||
958 | while (regsused < 2 && len > 0) | |
959 | { | |
960 | write_register (regsused, extract_unsigned_integer (val, 4)); | |
961 | val += 4; | |
962 | len -= 4; | |
963 | regsused++; | |
964 | } | |
965 | ||
966 | while (len > 0) | |
967 | { | |
968 | write_memory (sp + stack_offset, val, 4); | |
969 | len -= 4; | |
970 | val += 4; | |
971 | stack_offset += 4; | |
972 | } | |
973 | ||
974 | args++; | |
975 | } | |
976 | ||
977 | /* Make space for the flushback area. */ | |
978 | sp -= 8; | |
979 | return sp; | |
980 | } | |
981 | ||
982 | /* Function: push_return_address (pc) | |
983 | Set up the return address for the inferior function call. | |
984 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
c5aa993b | 985 | |
2ac51b36 | 986 | static CORE_ADDR |
fba45db2 | 987 | mn10300_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
c906108c SS |
988 | { |
989 | unsigned char buf[4]; | |
990 | ||
88a82a65 | 991 | store_unsigned_integer (buf, 4, entry_point_address ()); |
c906108c SS |
992 | write_memory (sp - 4, buf, 4); |
993 | return sp - 4; | |
994 | } | |
995 | ||
996 | /* Function: store_struct_return (addr,sp) | |
997 | Store the structure value return address for an inferior function | |
998 | call. */ | |
c5aa993b | 999 | |
2ac51b36 | 1000 | static void |
fba45db2 | 1001 | mn10300_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
c906108c SS |
1002 | { |
1003 | /* The structure return address is passed as the first argument. */ | |
1004 | write_register (0, addr); | |
c906108c | 1005 | } |
c5aa993b | 1006 | |
c906108c SS |
1007 | /* Function: frame_saved_pc |
1008 | Find the caller of this frame. We do this by seeing if RP_REGNUM | |
1009 | is saved in the stack anywhere, otherwise we get it from the | |
1010 | registers. If the inner frame is a dummy frame, return its PC | |
1011 | instead of RP, because that's where "caller" of the dummy-frame | |
1012 | will be found. */ | |
1013 | ||
2ac51b36 | 1014 | static CORE_ADDR |
fba45db2 | 1015 | mn10300_frame_saved_pc (struct frame_info *fi) |
c906108c | 1016 | { |
ae83b20d | 1017 | int adjust = saved_regs_size (fi); |
c906108c | 1018 | |
b1e29e33 AC |
1019 | return (read_memory_integer (get_frame_base (fi) + adjust, |
1020 | DEPRECATED_REGISTER_SIZE)); | |
c906108c SS |
1021 | } |
1022 | ||
c906108c SS |
1023 | /* Function: mn10300_init_extra_frame_info |
1024 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
1025 | registers. Most of the work is done in mn10300_analyze_prologue(). | |
1026 | ||
1027 | Note that when we are called for the last frame (currently active frame), | |
50abf9e5 | 1028 | that get_frame_pc (fi) and fi->frame will already be setup. However, fi->frame will |
c906108c SS |
1029 | be valid only if this routine uses FP. For previous frames, fi-frame will |
1030 | always be correct. mn10300_analyze_prologue will fix fi->frame if | |
1031 | it's not valid. | |
1032 | ||
04714b91 AC |
1033 | We can be called with the PC in the call dummy under two |
1034 | circumstances. First, during normal backtracing, second, while | |
1035 | figuring out the frame pointer just prior to calling the target | |
1036 | function (see call_function_by_hand). */ | |
c906108c | 1037 | |
2ac51b36 | 1038 | static void |
ad8fe2ce | 1039 | mn10300_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
c906108c | 1040 | { |
11c02a10 | 1041 | if (get_next_frame (fi)) |
8bedc050 | 1042 | deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi))); |
c906108c SS |
1043 | |
1044 | frame_saved_regs_zalloc (fi); | |
a00a19e9 | 1045 | frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info)); |
c906108c | 1046 | |
da50a4b7 AC |
1047 | get_frame_extra_info (fi)->status = 0; |
1048 | get_frame_extra_info (fi)->stack_size = 0; | |
c906108c SS |
1049 | |
1050 | mn10300_analyze_prologue (fi, 0); | |
1051 | } | |
1052 | ||
ad8fe2ce JB |
1053 | |
1054 | /* This function's job is handled by init_extra_frame_info. */ | |
2ac51b36 | 1055 | static void |
ad8fe2ce JB |
1056 | mn10300_frame_init_saved_regs (struct frame_info *frame) |
1057 | { | |
1058 | } | |
1059 | ||
1060 | ||
c906108c SS |
1061 | /* Function: mn10300_virtual_frame_pointer |
1062 | Return the register that the function uses for a frame pointer, | |
1063 | plus any necessary offset to be applied to the register before | |
1064 | any frame pointer offsets. */ | |
1065 | ||
39d4ef09 AC |
1066 | static void |
1067 | mn10300_virtual_frame_pointer (CORE_ADDR pc, | |
1068 | int *reg, | |
1069 | LONGEST *offset) | |
c906108c SS |
1070 | { |
1071 | struct frame_info *dummy = analyze_dummy_frame (pc, 0); | |
1072 | /* Set up a dummy frame_info, Analyze the prolog and fill in the | |
1073 | extra info. */ | |
1074 | /* Results will tell us which type of frame it uses. */ | |
da50a4b7 | 1075 | if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_SP) |
c906108c | 1076 | { |
c5aa993b | 1077 | *reg = SP_REGNUM; |
da50a4b7 | 1078 | *offset = -(get_frame_extra_info (dummy)->stack_size); |
c906108c SS |
1079 | } |
1080 | else | |
1081 | { | |
c5aa993b | 1082 | *reg = A3_REGNUM; |
c906108c SS |
1083 | *offset = 0; |
1084 | } | |
1085 | } | |
c5aa993b | 1086 | |
91225883 AC |
1087 | static int |
1088 | mn10300_reg_struct_has_addr (int gcc_p, struct type *type) | |
c906108c | 1089 | { |
91225883 AC |
1090 | return (TYPE_LENGTH (type) > 8); |
1091 | } | |
c906108c | 1092 | |
f6df245f AC |
1093 | static struct type * |
1094 | mn10300_register_virtual_type (int reg) | |
1095 | { | |
1096 | return builtin_type_int; | |
1097 | } | |
1098 | ||
1099 | static int | |
1100 | mn10300_register_byte (int reg) | |
1101 | { | |
1102 | return (reg * 4); | |
1103 | } | |
1104 | ||
1105 | static int | |
1106 | mn10300_register_virtual_size (int reg) | |
1107 | { | |
1108 | return 4; | |
1109 | } | |
1110 | ||
1111 | static int | |
1112 | mn10300_register_raw_size (int reg) | |
1113 | { | |
1114 | return 4; | |
1115 | } | |
1116 | ||
23436510 JB |
1117 | /* If DWARF2 is a register number appearing in Dwarf2 debug info, then |
1118 | mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB | |
1119 | register number. Why don't Dwarf2 and GDB use the same numbering? | |
1120 | Who knows? But since people have object files lying around with | |
1121 | the existing Dwarf2 numbering, and other people have written stubs | |
1122 | to work with the existing GDB, neither of them can change. So we | |
1123 | just have to cope. */ | |
1124 | static int | |
1125 | mn10300_dwarf2_reg_to_regnum (int dwarf2) | |
1126 | { | |
1127 | /* This table is supposed to be shaped like the REGISTER_NAMES | |
1128 | initializer in gcc/config/mn10300/mn10300.h. Registers which | |
1129 | appear in GCC's numbering, but have no counterpart in GDB's | |
1130 | world, are marked with a -1. */ | |
1131 | static int dwarf2_to_gdb[] = { | |
1132 | 0, 1, 2, 3, 4, 5, 6, 7, -1, 8, | |
1133 | 15, 16, 17, 18, 19, 20, 21, 22 | |
1134 | }; | |
1135 | int gdb; | |
1136 | ||
1137 | if (dwarf2 < 0 | |
1138 | || dwarf2 >= (sizeof (dwarf2_to_gdb) / sizeof (dwarf2_to_gdb[0])) | |
1139 | || dwarf2_to_gdb[dwarf2] == -1) | |
1140 | internal_error (__FILE__, __LINE__, | |
1141 | "bogus register number in debug info: %d", dwarf2); | |
1142 | ||
1143 | return dwarf2_to_gdb[dwarf2]; | |
1144 | } | |
1145 | ||
f6df245f AC |
1146 | static void |
1147 | mn10300_print_register (const char *name, int regnum, int reg_width) | |
1148 | { | |
d9d9c31f | 1149 | char raw_buffer[MAX_REGISTER_SIZE]; |
f6df245f AC |
1150 | |
1151 | if (reg_width) | |
1152 | printf_filtered ("%*s: ", reg_width, name); | |
1153 | else | |
1154 | printf_filtered ("%s: ", name); | |
1155 | ||
1156 | /* Get the data */ | |
6e7f8b9c | 1157 | if (!frame_register_read (deprecated_selected_frame, regnum, raw_buffer)) |
f6df245f AC |
1158 | { |
1159 | printf_filtered ("[invalid]"); | |
1160 | return; | |
1161 | } | |
1162 | else | |
1163 | { | |
1164 | int byte; | |
d7449b42 | 1165 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
f6df245f | 1166 | { |
12c266ea AC |
1167 | for (byte = DEPRECATED_REGISTER_RAW_SIZE (regnum) - DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum); |
1168 | byte < DEPRECATED_REGISTER_RAW_SIZE (regnum); | |
f6df245f AC |
1169 | byte++) |
1170 | printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); | |
1171 | } | |
1172 | else | |
1173 | { | |
f30992d4 | 1174 | for (byte = DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum) - 1; |
f6df245f AC |
1175 | byte >= 0; |
1176 | byte--) | |
1177 | printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); | |
1178 | } | |
1179 | } | |
1180 | } | |
1181 | ||
1182 | static void | |
1183 | mn10300_do_registers_info (int regnum, int fpregs) | |
1184 | { | |
1185 | if (regnum >= 0) | |
1186 | { | |
1187 | const char *name = REGISTER_NAME (regnum); | |
1188 | if (name == NULL || name[0] == '\0') | |
1189 | error ("Not a valid register for the current processor type"); | |
1190 | mn10300_print_register (name, regnum, 0); | |
1191 | printf_filtered ("\n"); | |
1192 | } | |
1193 | else | |
1194 | { | |
1195 | /* print registers in an array 4x8 */ | |
1196 | int r; | |
1197 | int reg; | |
1198 | const int nr_in_row = 4; | |
1199 | const int reg_width = 4; | |
1200 | for (r = 0; r < NUM_REGS; r += nr_in_row) | |
1201 | { | |
1202 | int c; | |
1203 | int printing = 0; | |
1204 | int padding = 0; | |
1205 | for (c = r; c < r + nr_in_row; c++) | |
1206 | { | |
1207 | const char *name = REGISTER_NAME (c); | |
1208 | if (name != NULL && *name != '\0') | |
1209 | { | |
1210 | printing = 1; | |
1211 | while (padding > 0) | |
1212 | { | |
1213 | printf_filtered (" "); | |
1214 | padding--; | |
1215 | } | |
1216 | mn10300_print_register (name, c, reg_width); | |
1217 | printf_filtered (" "); | |
1218 | } | |
1219 | else | |
1220 | { | |
1221 | padding += (reg_width + 2 + 8 + 1); | |
1222 | } | |
1223 | } | |
1224 | if (printing) | |
1225 | printf_filtered ("\n"); | |
1226 | } | |
1227 | } | |
1228 | } | |
1229 | ||
bd1ce8ba AC |
1230 | static CORE_ADDR |
1231 | mn10300_read_fp (void) | |
1232 | { | |
1233 | /* That's right, we're using the stack pointer as our frame pointer. */ | |
1234 | gdb_assert (SP_REGNUM >= 0); | |
1235 | return read_register (SP_REGNUM); | |
1236 | } | |
1237 | ||
91225883 | 1238 | /* Dump out the mn10300 speciic architecture information. */ |
c906108c | 1239 | |
91225883 AC |
1240 | static void |
1241 | mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1242 | { | |
1243 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
1244 | fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n", | |
1245 | tdep->am33_mode); | |
1246 | } | |
c2d11a7d | 1247 | |
91225883 AC |
1248 | static struct gdbarch * |
1249 | mn10300_gdbarch_init (struct gdbarch_info info, | |
1250 | struct gdbarch_list *arches) | |
1251 | { | |
1252 | struct gdbarch *gdbarch; | |
1253 | struct gdbarch_tdep *tdep = NULL; | |
1254 | int am33_mode; | |
1255 | gdbarch_register_name_ftype *register_name; | |
1256 | int mach; | |
1257 | int num_regs; | |
1258 | ||
1259 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1260 | if (arches != NULL) | |
1261 | return arches->gdbarch; | |
1262 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); | |
1263 | gdbarch = gdbarch_alloc (&info, tdep); | |
1264 | ||
1265 | if (info.bfd_arch_info != NULL | |
f6df245f | 1266 | && info.bfd_arch_info->arch == bfd_arch_mn10300) |
91225883 AC |
1267 | mach = info.bfd_arch_info->mach; |
1268 | else | |
1269 | mach = 0; | |
1270 | switch (mach) | |
1271 | { | |
1272 | case 0: | |
f6df245f | 1273 | case bfd_mach_mn10300: |
91225883 AC |
1274 | am33_mode = 0; |
1275 | register_name = mn10300_generic_register_name; | |
1276 | num_regs = 32; | |
1277 | break; | |
1278 | case bfd_mach_am33: | |
c2d11a7d | 1279 | am33_mode = 1; |
91225883 AC |
1280 | register_name = am33_register_name; |
1281 | num_regs = 32; | |
1282 | break; | |
1283 | default: | |
8e65ff28 AC |
1284 | internal_error (__FILE__, __LINE__, |
1285 | "mn10300_gdbarch_init: Unknown mn10300 variant"); | |
91225883 | 1286 | return NULL; /* keep GCC happy. */ |
c2d11a7d | 1287 | } |
c906108c | 1288 | |
584f96a8 JB |
1289 | /* Registers. */ |
1290 | set_gdbarch_num_regs (gdbarch, num_regs); | |
1291 | set_gdbarch_register_name (gdbarch, register_name); | |
b1e29e33 | 1292 | set_gdbarch_deprecated_register_size (gdbarch, 4); |
b8b527c5 | 1293 | set_gdbarch_deprecated_register_bytes (gdbarch, num_regs * gdbarch_deprecated_register_size (gdbarch)); |
a0ed5532 | 1294 | set_gdbarch_deprecated_max_register_raw_size (gdbarch, 4); |
9c04cab7 AC |
1295 | set_gdbarch_deprecated_register_raw_size (gdbarch, mn10300_register_raw_size); |
1296 | set_gdbarch_deprecated_register_byte (gdbarch, mn10300_register_byte); | |
a0ed5532 | 1297 | set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 4); |
9c04cab7 AC |
1298 | set_gdbarch_deprecated_register_virtual_size (gdbarch, mn10300_register_virtual_size); |
1299 | set_gdbarch_deprecated_register_virtual_type (gdbarch, mn10300_register_virtual_type); | |
23436510 | 1300 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum); |
903ad3a6 | 1301 | set_gdbarch_deprecated_do_registers_info (gdbarch, mn10300_do_registers_info); |
a15525c1 AC |
1302 | set_gdbarch_sp_regnum (gdbarch, 8); |
1303 | set_gdbarch_pc_regnum (gdbarch, 9); | |
0ba6dca9 | 1304 | set_gdbarch_deprecated_fp_regnum (gdbarch, 31); |
39d4ef09 | 1305 | set_gdbarch_virtual_frame_pointer (gdbarch, mn10300_virtual_frame_pointer); |
584f96a8 JB |
1306 | |
1307 | /* Breakpoints. */ | |
ad8fe2ce | 1308 | set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc); |
584f96a8 JB |
1309 | |
1310 | /* Stack unwinding. */ | |
ad8fe2ce | 1311 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
6913c89a | 1312 | set_gdbarch_deprecated_saved_pc_after_call (gdbarch, mn10300_saved_pc_after_call); |
e9582e71 | 1313 | set_gdbarch_deprecated_init_extra_frame_info (gdbarch, mn10300_init_extra_frame_info); |
f30ee0bc | 1314 | set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, mn10300_frame_init_saved_regs); |
618ce49f | 1315 | set_gdbarch_deprecated_frame_chain (gdbarch, mn10300_frame_chain); |
8bedc050 | 1316 | set_gdbarch_deprecated_frame_saved_pc (gdbarch, mn10300_frame_saved_pc); |
d560a54b | 1317 | set_gdbarch_return_value (gdbarch, mn10300_return_value); |
4183d812 | 1318 | set_gdbarch_deprecated_store_struct_return (gdbarch, mn10300_store_struct_return); |
749b82f6 | 1319 | set_gdbarch_deprecated_pop_frame (gdbarch, mn10300_pop_frame); |
ad8fe2ce | 1320 | set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue); |
ad8fe2ce | 1321 | /* That's right, we're using the stack pointer as our frame pointer. */ |
bd1ce8ba | 1322 | set_gdbarch_deprecated_target_read_fp (gdbarch, mn10300_read_fp); |
584f96a8 JB |
1323 | |
1324 | /* Calling functions in the inferior from GDB. */ | |
b81774d8 | 1325 | set_gdbarch_deprecated_push_arguments (gdbarch, mn10300_push_arguments); |
2110b94f MK |
1326 | set_gdbarch_deprecated_reg_struct_has_addr |
1327 | (gdbarch, mn10300_reg_struct_has_addr); | |
28f617b3 | 1328 | set_gdbarch_deprecated_push_return_address (gdbarch, mn10300_push_return_address); |
ad8fe2ce | 1329 | |
91225883 AC |
1330 | tdep->am33_mode = am33_mode; |
1331 | ||
6c0e89ed | 1332 | /* Should be using push_dummy_call. */ |
b46e02f6 | 1333 | set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp); |
6c0e89ed | 1334 | |
36482093 AC |
1335 | set_gdbarch_print_insn (gdbarch, print_insn_mn10300); |
1336 | ||
91225883 AC |
1337 | return gdbarch; |
1338 | } | |
1339 | ||
c906108c | 1340 | void |
fba45db2 | 1341 | _initialize_mn10300_tdep (void) |
c906108c SS |
1342 | { |
1343 | /* printf("_initialize_mn10300_tdep\n"); */ | |
43e9390b | 1344 | gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep); |
c906108c | 1345 | } |