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66d05e03 | 1 | /* Target-dependent code for Hitachi Super-H, for GDB. |
4c95336d | 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc. |
9faacb92 SC |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
6c9638b4 | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
9faacb92 SC |
19 | |
20 | /* | |
21 | Contributed by Steve Chamberlain | |
22 | sac@cygnus.com | |
23 | */ | |
24 | ||
25 | #include "defs.h" | |
26 | #include "frame.h" | |
27 | #include "obstack.h" | |
28 | #include "symtab.h" | |
cf2b165e | 29 | #include "symfile.h" |
9faacb92 SC |
30 | #include "gdbtypes.h" |
31 | #include "gdbcmd.h" | |
66d05e03 | 32 | #include "gdbcore.h" |
9faacb92 SC |
33 | #include "value.h" |
34 | #include "dis-asm.h" | |
69992fc8 | 35 | #include "inferior.h" /* for BEFORE_TEXT_END etc. */ |
cf2b165e | 36 | #include "gdb_string.h" |
5f2f2809 | 37 | |
00dd4fd9 SS |
38 | /* A set of original names, to be used when restoring back to generic |
39 | registers from a specific set. */ | |
40 | ||
9ddf9aa9 AC |
41 | static char *sh_generic_reg_names[] = { |
42 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
43 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
44 | "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", | |
45 | "fpul", "fpscr", | |
46 | "fr0", "fr1", "fr2", "fr3", "fr4", "fr5", "fr6", "fr7", | |
47 | "fr8", "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15", | |
48 | "ssr", "spc", | |
49 | "r0b0", "r1b0", "r2b0", "r3b0", "r4b0", "r5b0", "r6b0", "r7b0", | |
50 | "r0b1", "r1b1", "r2b1", "r3b1", "r4b1", "r5b1", "r6b1", "r7b1", | |
51 | }; | |
00dd4fd9 | 52 | |
9ddf9aa9 | 53 | static char *sh_reg_names[] = { |
12ffa10c SS |
54 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
55 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
56 | "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", | |
57 | "", "", | |
58 | "", "", "", "", "", "", "", "", | |
59 | "", "", "", "", "", "", "", "", | |
60 | "", "", | |
61 | "", "", "", "", "", "", "", "", | |
62 | "", "", "", "", "", "", "", "", | |
00dd4fd9 SS |
63 | }; |
64 | ||
9ddf9aa9 | 65 | static char *sh3_reg_names[] = { |
12ffa10c SS |
66 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
67 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
68 | "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", | |
69 | "", "", | |
70 | "", "", "", "", "", "", "", "", | |
71 | "", "", "", "", "", "", "", "", | |
72 | "ssr", "spc", | |
05535e79 | 73 | "r0b0", "r1b0", "r2b0", "r3b0", "r4b0", "r5b0", "r6b0", "r7b0", |
12ffa10c | 74 | "r0b1", "r1b1", "r2b1", "r3b1", "r4b1", "r5b1", "r6b1", "r7b1" |
05535e79 SS |
75 | }; |
76 | ||
9ddf9aa9 | 77 | static char *sh3e_reg_names[] = { |
12ffa10c SS |
78 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
79 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
80 | "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", | |
81 | "fpul", "fpscr", | |
82 | "fr0", "fr1", "fr2", "fr3", "fr4", "fr5", "fr6", "fr7", | |
83 | "fr8", "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15", | |
84 | "ssr", "spc", | |
05535e79 SS |
85 | "r0b0", "r1b0", "r2b0", "r3b0", "r4b0", "r5b0", "r6b0", "r7b0", |
86 | "r0b1", "r1b1", "r2b1", "r3b1", "r4b1", "r5b1", "r6b1", "r7b1", | |
00dd4fd9 SS |
87 | }; |
88 | ||
9ddf9aa9 AC |
89 | char **sh_register_names = sh_generic_reg_names; |
90 | ||
91 | ||
00dd4fd9 | 92 | struct { |
00dd4fd9 | 93 | char **regnames; |
d0aba53f | 94 | int mach; |
00dd4fd9 | 95 | } sh_processor_type_table[] = { |
d0aba53f AC |
96 | { sh_reg_names, bfd_mach_sh }, |
97 | { sh3_reg_names, bfd_mach_sh3 }, | |
98 | { sh3e_reg_names, bfd_mach_sh3e }, | |
d0aba53f | 99 | { sh3e_reg_names, bfd_mach_sh4 }, |
d0aba53f | 100 | { NULL, 0 } |
00dd4fd9 SS |
101 | }; |
102 | ||
9faacb92 SC |
103 | /* Prologue looks like |
104 | [mov.l <regs>,@-r15]... | |
105 | [sts.l pr,@-r15] | |
106 | [mov.l r14,@-r15] | |
107 | [mov r15,r14] | |
108 | */ | |
109 | ||
110 | #define IS_STS(x) ((x) == 0x4f22) | |
111 | #define IS_PUSH(x) (((x) & 0xff0f) == 0x2f06) | |
112 | #define GET_PUSHED_REG(x) (((x) >> 4) & 0xf) | |
113 | #define IS_MOV_SP_FP(x) ((x) == 0x6ef3) | |
114 | #define IS_ADD_SP(x) (((x) & 0xff00) == 0x7f00) | |
c4deed18 SC |
115 | #define IS_MOV_R3(x) (((x) & 0xff00) == 0x1a00) |
116 | #define IS_SHLL_R3(x) ((x) == 0x4300) | |
117 | #define IS_ADD_R3SP(x) ((x) == 0x3f3c) | |
4a9d4495 FF |
118 | #define IS_FMOV(x) (((x) & 0xf00f) == 0xf00b) |
119 | #define FPSCR_SZ (1 << 20) | |
9faacb92 | 120 | |
98760eab AC |
121 | |
122 | /* Should call_function allocate stack space for a struct return? */ | |
123 | int | |
124 | sh_use_struct_convention (gcc_p, type) | |
125 | int gcc_p; | |
126 | struct type *type; | |
127 | { | |
128 | return (TYPE_LENGTH (type) > 1); | |
129 | } | |
130 | ||
131 | ||
9faacb92 SC |
132 | /* Skip any prologue before the guts of a function */ |
133 | ||
134 | CORE_ADDR | |
135 | sh_skip_prologue (start_pc) | |
136 | CORE_ADDR start_pc; | |
9faacb92 SC |
137 | { |
138 | int w; | |
139 | ||
140 | w = read_memory_integer (start_pc, 2); | |
141 | while (IS_STS (w) | |
4a9d4495 | 142 | || IS_FMOV (w) |
9faacb92 | 143 | || IS_PUSH (w) |
c4deed18 | 144 | || IS_MOV_SP_FP (w) |
5f2f2809 SC |
145 | || IS_MOV_R3 (w) |
146 | || IS_ADD_R3SP (w) | |
147 | || IS_ADD_SP (w) | |
148 | || IS_SHLL_R3 (w)) | |
9faacb92 SC |
149 | { |
150 | start_pc += 2; | |
151 | w = read_memory_integer (start_pc, 2); | |
152 | } | |
153 | ||
154 | return start_pc; | |
155 | } | |
156 | ||
18b46e7c | 157 | /* Disassemble an instruction. */ |
9faacb92 SC |
158 | |
159 | int | |
18b46e7c SS |
160 | gdb_print_insn_sh (memaddr, info) |
161 | bfd_vma memaddr; | |
162 | disassemble_info *info; | |
9faacb92 | 163 | { |
5f2f2809 | 164 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) |
5076ecd0 | 165 | return print_insn_sh (memaddr, info); |
5f2f2809 | 166 | else |
5076ecd0 | 167 | return print_insn_shl (memaddr, info); |
9faacb92 | 168 | } |
18b46e7c | 169 | |
9faacb92 SC |
170 | /* Given a GDB frame, determine the address of the calling function's frame. |
171 | This will be used to create a new GDB frame struct, and then | |
172 | INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. | |
173 | ||
174 | For us, the frame address is its stack pointer value, so we look up | |
175 | the function prologue to determine the caller's sp value, and return it. */ | |
176 | ||
669caa9c SS |
177 | CORE_ADDR |
178 | sh_frame_chain (frame) | |
179 | struct frame_info *frame; | |
9faacb92 | 180 | { |
69992fc8 MS |
181 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
182 | return frame->frame; /* dummy frame same as caller's frame */ | |
669caa9c SS |
183 | if (!inside_entry_file (frame->pc)) |
184 | return read_memory_integer (FRAME_FP (frame) + frame->f_offset, 4); | |
9faacb92 SC |
185 | else |
186 | return 0; | |
187 | } | |
188 | ||
69992fc8 MS |
189 | /* Find REGNUM on the stack. Otherwise, it's in an active register. One thing |
190 | we might want to do here is to check REGNUM against the clobber mask, and | |
191 | somehow flag it as invalid if it isn't saved on the stack somewhere. This | |
192 | would provide a graceful failure mode when trying to get the value of | |
193 | caller-saves registers for an inner frame. */ | |
194 | ||
195 | CORE_ADDR | |
196 | sh_find_callers_reg (fi, regnum) | |
197 | struct frame_info *fi; | |
198 | int regnum; | |
199 | { | |
200 | struct frame_saved_regs fsr; | |
201 | ||
202 | for (; fi; fi = fi->next) | |
203 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
204 | /* When the caller requests PR from the dummy frame, we return PC because | |
205 | that's where the previous routine appears to have done a call from. */ | |
dc1b349d | 206 | return generic_read_register_dummy (fi->pc, fi->frame, regnum); |
69992fc8 MS |
207 | else |
208 | { | |
209 | FRAME_FIND_SAVED_REGS(fi, fsr); | |
210 | if (fsr.regs[regnum] != 0) | |
211 | return read_memory_integer (fsr.regs[regnum], | |
212 | REGISTER_RAW_SIZE(regnum)); | |
213 | } | |
214 | return read_register (regnum); | |
215 | } | |
216 | ||
66d05e03 SS |
217 | /* Put here the code to store, into a struct frame_saved_regs, the |
218 | addresses of the saved registers of frame described by FRAME_INFO. | |
9faacb92 | 219 | This includes special registers such as pc and fp saved in special |
66d05e03 SS |
220 | ways in the stack frame. sp is even more special: the address we |
221 | return for it IS the sp for the next frame. */ | |
9faacb92 SC |
222 | |
223 | void | |
69992fc8 | 224 | sh_frame_find_saved_regs (fi, fsr) |
9faacb92 SC |
225 | struct frame_info *fi; |
226 | struct frame_saved_regs *fsr; | |
227 | { | |
7ccb1e44 | 228 | int where[NUM_REGS]; |
9faacb92 SC |
229 | int rn; |
230 | int have_fp = 0; | |
231 | int depth; | |
232 | int pc; | |
233 | int opc; | |
234 | int insn; | |
c4deed18 | 235 | int r3_val = 0; |
dc1b349d | 236 | char * dummy_regs = generic_find_dummy_frame (fi->pc, fi->frame); |
69992fc8 MS |
237 | |
238 | if (dummy_regs) | |
239 | { | |
240 | /* DANGER! This is ONLY going to work if the char buffer format of | |
241 | the saved registers is byte-for-byte identical to the | |
242 | CORE_ADDR regs[NUM_REGS] format used by struct frame_saved_regs! */ | |
243 | memcpy (&fsr->regs, dummy_regs, sizeof(fsr)); | |
244 | return; | |
245 | } | |
9faacb92 SC |
246 | |
247 | opc = pc = get_pc_function_start (fi->pc); | |
248 | ||
249 | insn = read_memory_integer (pc, 2); | |
250 | ||
c4deed18 SC |
251 | fi->leaf_function = 1; |
252 | fi->f_offset = 0; | |
253 | ||
9faacb92 SC |
254 | for (rn = 0; rn < NUM_REGS; rn++) |
255 | where[rn] = -1; | |
256 | ||
257 | depth = 0; | |
258 | ||
4a9d4495 FF |
259 | /* Loop around examining the prologue insns until we find something |
260 | that does not appear to be part of the prologue. But give up | |
261 | after 20 of them, since we're getting silly then. */ | |
262 | ||
263 | while (pc < opc + 20 * 2) | |
9faacb92 SC |
264 | { |
265 | /* See where the registers will be saved to */ | |
266 | if (IS_PUSH (insn)) | |
267 | { | |
268 | pc += 2; | |
269 | rn = GET_PUSHED_REG (insn); | |
270 | where[rn] = depth; | |
271 | insn = read_memory_integer (pc, 2); | |
272 | depth += 4; | |
273 | } | |
274 | else if (IS_STS (insn)) | |
275 | { | |
276 | pc += 2; | |
277 | where[PR_REGNUM] = depth; | |
278 | insn = read_memory_integer (pc, 2); | |
c4deed18 SC |
279 | /* If we're storing the pr then this isn't a leaf */ |
280 | fi->leaf_function = 0; | |
9faacb92 SC |
281 | depth += 4; |
282 | } | |
c4deed18 SC |
283 | else if (IS_MOV_R3 (insn)) |
284 | { | |
0a325463 | 285 | r3_val = ((insn & 0xff) ^ 0x80) - 0x80; |
5f2f2809 | 286 | pc += 2; |
c4deed18 SC |
287 | insn = read_memory_integer (pc, 2); |
288 | } | |
289 | else if (IS_SHLL_R3 (insn)) | |
290 | { | |
5f2f2809 SC |
291 | r3_val <<= 1; |
292 | pc += 2; | |
c4deed18 SC |
293 | insn = read_memory_integer (pc, 2); |
294 | } | |
295 | else if (IS_ADD_R3SP (insn)) | |
296 | { | |
297 | depth += -r3_val; | |
5f2f2809 | 298 | pc += 2; |
c4deed18 SC |
299 | insn = read_memory_integer (pc, 2); |
300 | } | |
9faacb92 SC |
301 | else if (IS_ADD_SP (insn)) |
302 | { | |
303 | pc += 2; | |
0a325463 | 304 | depth -= ((insn & 0xff) ^ 0x80) - 0x80; |
9faacb92 SC |
305 | insn = read_memory_integer (pc, 2); |
306 | } | |
4a9d4495 FF |
307 | else if (IS_FMOV (insn)) |
308 | { | |
309 | pc += 2; | |
310 | insn = read_memory_integer (pc, 2); | |
311 | if (read_register (FPSCR_REGNUM) & FPSCR_SZ) | |
312 | { | |
313 | depth += 8; | |
314 | } | |
315 | else | |
316 | { | |
317 | depth += 4; | |
318 | } | |
319 | } | |
df14b38b SC |
320 | else |
321 | break; | |
9faacb92 SC |
322 | } |
323 | ||
324 | /* Now we know how deep things are, we can work out their addresses */ | |
325 | ||
326 | for (rn = 0; rn < NUM_REGS; rn++) | |
327 | { | |
328 | if (where[rn] >= 0) | |
329 | { | |
330 | if (rn == FP_REGNUM) | |
331 | have_fp = 1; | |
332 | ||
333 | fsr->regs[rn] = fi->frame - where[rn] + depth - 4; | |
334 | } | |
335 | else | |
336 | { | |
337 | fsr->regs[rn] = 0; | |
338 | } | |
339 | } | |
340 | ||
341 | if (have_fp) | |
342 | { | |
9faacb92 SC |
343 | fsr->regs[SP_REGNUM] = read_memory_integer (fsr->regs[FP_REGNUM], 4); |
344 | } | |
345 | else | |
346 | { | |
347 | fsr->regs[SP_REGNUM] = fi->frame - 4; | |
348 | } | |
349 | ||
c4deed18 | 350 | fi->f_offset = depth - where[FP_REGNUM] - 4; |
9faacb92 SC |
351 | /* Work out the return pc - either from the saved pr or the pr |
352 | value */ | |
9faacb92 SC |
353 | } |
354 | ||
355 | /* initialize the extra info saved in a FRAME */ | |
356 | ||
357 | void | |
69992fc8 | 358 | sh_init_extra_frame_info (fromleaf, fi) |
9faacb92 SC |
359 | int fromleaf; |
360 | struct frame_info *fi; | |
361 | { | |
69992fc8 | 362 | struct frame_saved_regs fsr; |
66d05e03 | 363 | |
5c8ba017 | 364 | if (fi->next) |
69992fc8 | 365 | fi->pc = FRAME_SAVED_PC (fi->next); |
5c8ba017 | 366 | |
69992fc8 MS |
367 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
368 | { | |
369 | /* We need to setup fi->frame here because run_stack_dummy gets it wrong | |
370 | by assuming it's always FP. */ | |
dc1b349d MS |
371 | fi->frame = generic_read_register_dummy (fi->pc, fi->frame, |
372 | SP_REGNUM); | |
373 | fi->return_pc = generic_read_register_dummy (fi->pc, fi->frame, | |
374 | PC_REGNUM); | |
69992fc8 MS |
375 | fi->f_offset = -(CALL_DUMMY_LENGTH + 4); |
376 | fi->leaf_function = 0; | |
377 | return; | |
378 | } | |
379 | else | |
380 | { | |
381 | FRAME_FIND_SAVED_REGS (fi, fsr); | |
382 | fi->return_pc = sh_find_callers_reg (fi, PR_REGNUM); | |
383 | } | |
9faacb92 SC |
384 | } |
385 | ||
9faacb92 SC |
386 | /* Discard from the stack the innermost frame, |
387 | restoring all saved registers. */ | |
388 | ||
389 | void | |
69992fc8 | 390 | sh_pop_frame () |
9faacb92 | 391 | { |
669caa9c | 392 | register struct frame_info *frame = get_current_frame (); |
9faacb92 SC |
393 | register CORE_ADDR fp; |
394 | register int regnum; | |
395 | struct frame_saved_regs fsr; | |
9faacb92 | 396 | |
69992fc8 MS |
397 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
398 | generic_pop_dummy_frame (); | |
399 | else | |
400 | { | |
401 | fp = FRAME_FP (frame); | |
402 | get_frame_saved_regs (frame, &fsr); | |
9faacb92 | 403 | |
69992fc8 MS |
404 | /* Copy regs from where they were saved in the frame */ |
405 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
9faacb92 | 406 | if (fsr.regs[regnum]) |
69992fc8 MS |
407 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); |
408 | ||
409 | write_register (PC_REGNUM, frame->return_pc); | |
410 | write_register (SP_REGNUM, fp + 4); | |
411 | } | |
412 | flush_cached_frames (); | |
413 | } | |
414 | ||
415 | /* Function: push_arguments | |
416 | Setup the function arguments for calling a function in the inferior. | |
417 | ||
418 | On the Hitachi SH architecture, there are four registers (R4 to R7) | |
419 | which are dedicated for passing function arguments. Up to the first | |
420 | four arguments (depending on size) may go into these registers. | |
421 | The rest go on the stack. | |
422 | ||
423 | Arguments that are smaller than 4 bytes will still take up a whole | |
424 | register or a whole 32-bit word on the stack, and will be | |
425 | right-justified in the register or the stack word. This includes | |
426 | chars, shorts, and small aggregate types. | |
427 | ||
428 | Arguments that are larger than 4 bytes may be split between two or | |
429 | more registers. If there are not enough registers free, an argument | |
430 | may be passed partly in a register (or registers), and partly on the | |
431 | stack. This includes doubles, long longs, and larger aggregates. | |
432 | As far as I know, there is no upper limit to the size of aggregates | |
433 | that will be passed in this way; in other words, the convention of | |
434 | passing a pointer to a large aggregate instead of a copy is not used. | |
435 | ||
436 | An exceptional case exists for struct arguments (and possibly other | |
437 | aggregates such as arrays) if the size is larger than 4 bytes but | |
438 | not a multiple of 4 bytes. In this case the argument is never split | |
439 | between the registers and the stack, but instead is copied in its | |
440 | entirety onto the stack, AND also copied into as many registers as | |
441 | there is room for. In other words, space in registers permitting, | |
442 | two copies of the same argument are passed in. As far as I can tell, | |
443 | only the one on the stack is used, although that may be a function | |
444 | of the level of compiler optimization. I suspect this is a compiler | |
445 | bug. Arguments of these odd sizes are left-justified within the | |
446 | word (as opposed to arguments smaller than 4 bytes, which are | |
447 | right-justified). | |
448 | ||
449 | ||
450 | If the function is to return an aggregate type such as a struct, it | |
451 | is either returned in the normal return value register R0 (if its | |
452 | size is no greater than one byte), or else the caller must allocate | |
453 | space into which the callee will copy the return value (if the size | |
454 | is greater than one byte). In this case, a pointer to the return | |
455 | value location is passed into the callee in register R2, which does | |
456 | not displace any of the other arguments passed in via registers R4 | |
457 | to R7. */ | |
458 | ||
459 | CORE_ADDR | |
460 | sh_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
461 | int nargs; | |
462 | value_ptr *args; | |
463 | CORE_ADDR sp; | |
464 | unsigned char struct_return; | |
465 | CORE_ADDR struct_addr; | |
466 | { | |
dc1b349d | 467 | int stack_offset, stack_alloc; |
69992fc8 MS |
468 | int argreg; |
469 | int argnum; | |
dc1b349d | 470 | struct type *type; |
69992fc8 MS |
471 | CORE_ADDR regval; |
472 | char *val; | |
473 | char valbuf[4]; | |
474 | int len; | |
dc1b349d | 475 | int odd_sized_struct; |
69992fc8 MS |
476 | |
477 | /* first force sp to a 4-byte alignment */ | |
478 | sp = sp & ~3; | |
479 | ||
480 | /* The "struct return pointer" pseudo-argument has its own dedicated | |
481 | register */ | |
482 | if (struct_return) | |
483 | write_register (STRUCT_RETURN_REGNUM, struct_addr); | |
484 | ||
dc1b349d MS |
485 | /* Now make sure there's space on the stack */ |
486 | for (argnum = 0, stack_alloc = 0; | |
487 | argnum < nargs; argnum++) | |
488 | stack_alloc += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3); | |
489 | sp -= stack_alloc; /* make room on stack for args */ | |
490 | ||
491 | ||
492 | /* Now load as many as possible of the first arguments into | |
493 | registers, and push the rest onto the stack. There are 16 bytes | |
494 | in four registers available. Loop thru args from first to last. */ | |
495 | ||
496 | argreg = ARG0_REGNUM; | |
497 | for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) | |
69992fc8 | 498 | { |
dc1b349d MS |
499 | type = VALUE_TYPE (args[argnum]); |
500 | len = TYPE_LENGTH (type); | |
501 | memset(valbuf, 0, sizeof(valbuf)); | |
69992fc8 | 502 | if (len < 4) |
dc1b349d MS |
503 | { /* value gets right-justified in the register or stack word */ |
504 | memcpy(valbuf + (4 - len), | |
69992fc8 | 505 | (char *) VALUE_CONTENTS (args[argnum]), len); |
dc1b349d MS |
506 | val = valbuf; |
507 | } | |
69992fc8 | 508 | else |
dc1b349d | 509 | val = (char *) VALUE_CONTENTS (args[argnum]); |
69992fc8 | 510 | |
dc1b349d MS |
511 | if (len > 4 && (len & 3) != 0) |
512 | odd_sized_struct = 1; /* such structs go entirely on stack */ | |
513 | else | |
514 | odd_sized_struct = 0; | |
69992fc8 | 515 | while (len > 0) |
9faacb92 | 516 | { |
dc1b349d | 517 | if (argreg > ARGLAST_REGNUM || odd_sized_struct) |
409f64ae | 518 | { /* must go on the stack */ |
dc1b349d MS |
519 | write_memory (sp + stack_offset, val, 4); |
520 | stack_offset += 4; | |
69992fc8 | 521 | } |
dc1b349d MS |
522 | /* NOTE WELL!!!!! This is not an "else if" clause!!! |
523 | That's because some *&^%$ things get passed on the stack | |
524 | AND in the registers! */ | |
525 | if (argreg <= ARGLAST_REGNUM) | |
409f64ae | 526 | { /* there's room in a register */ |
dc1b349d MS |
527 | regval = extract_address (val, REGISTER_RAW_SIZE(argreg)); |
528 | write_register (argreg++, regval); | |
529 | } | |
530 | /* Store the value 4 bytes at a time. This means that things | |
531 | larger than 4 bytes may go partly in registers and partly | |
532 | on the stack. */ | |
533 | len -= REGISTER_RAW_SIZE(argreg); | |
534 | val += REGISTER_RAW_SIZE(argreg); | |
9faacb92 SC |
535 | } |
536 | } | |
dc1b349d MS |
537 | return sp; |
538 | } | |
9faacb92 | 539 | |
dc1b349d MS |
540 | /* Function: push_return_address (pc) |
541 | Set up the return address for the inferior function call. | |
542 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
69992fc8 | 543 | |
dc1b349d MS |
544 | CORE_ADDR |
545 | sh_push_return_address (pc, sp) | |
546 | CORE_ADDR pc; | |
547 | CORE_ADDR sp; | |
548 | { | |
409f64ae | 549 | write_register (PR_REGNUM, CALL_DUMMY_ADDRESS ()); |
dc1b349d MS |
550 | return sp; |
551 | } | |
69992fc8 | 552 | |
dc1b349d MS |
553 | /* Function: fix_call_dummy |
554 | Poke the callee function's address into the destination part of | |
555 | the CALL_DUMMY. The address is actually stored in a data word | |
556 | following the actualy CALL_DUMMY instructions, which will load | |
557 | it into a register using PC-relative addressing. This function | |
558 | expects the CALL_DUMMY to look like this: | |
69992fc8 | 559 | |
dc1b349d MS |
560 | mov.w @(2,PC), R8 |
561 | jsr @R8 | |
562 | nop | |
563 | trap | |
564 | <destination> | |
565 | */ | |
566 | ||
cf2b165e FF |
567 | #if 0 |
568 | void | |
dc1b349d MS |
569 | sh_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) |
570 | char *dummy; | |
571 | CORE_ADDR pc; | |
572 | CORE_ADDR fun; | |
573 | int nargs; | |
574 | value_ptr *args; | |
575 | struct type *type; | |
576 | int gcc_p; | |
577 | { | |
578 | *(unsigned long *) (dummy + 8) = fun; | |
69992fc8 | 579 | } |
cf2b165e | 580 | #endif |
69992fc8 | 581 | |
dc1b349d MS |
582 | /* Function: get_saved_register |
583 | Just call the generic_get_saved_register function. */ | |
69992fc8 MS |
584 | |
585 | void | |
dc1b349d MS |
586 | get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) |
587 | char *raw_buffer; | |
588 | int *optimized; | |
589 | CORE_ADDR *addrp; | |
590 | struct frame_info *frame; | |
591 | int regnum; | |
592 | enum lval_type *lval; | |
69992fc8 | 593 | { |
dc1b349d MS |
594 | generic_get_saved_register (raw_buffer, optimized, addrp, |
595 | frame, regnum, lval); | |
9faacb92 | 596 | } |
edd01519 | 597 | |
dc1b349d | 598 | |
00dd4fd9 SS |
599 | /* Modify the actual processor type. */ |
600 | ||
601 | int | |
d0aba53f AC |
602 | sh_target_architecture_hook (ap) |
603 | const bfd_arch_info_type *ap; | |
00dd4fd9 SS |
604 | { |
605 | int i, j; | |
606 | ||
d0aba53f | 607 | if (ap->arch != bfd_arch_sh) |
00dd4fd9 SS |
608 | return 0; |
609 | ||
d0aba53f | 610 | for (i = 0; sh_processor_type_table[i].regnames != NULL; i++) |
00dd4fd9 | 611 | { |
d0aba53f | 612 | if (sh_processor_type_table[i].mach == ap->mach) |
00dd4fd9 | 613 | { |
9ddf9aa9 | 614 | sh_register_names = sh_processor_type_table[i].regnames; |
00dd4fd9 SS |
615 | } |
616 | } | |
617 | ||
d0aba53f | 618 | fatal ("Architecture `%s' unreconized", ap->printable_name); |
00dd4fd9 SS |
619 | } |
620 | ||
edd01519 | 621 | /* Print the registers in a form similar to the E7000 */ |
669caa9c | 622 | |
edd01519 | 623 | static void |
69992fc8 | 624 | sh_show_regs (args, from_tty) |
669caa9c SS |
625 | char *args; |
626 | int from_tty; | |
edd01519 | 627 | { |
d0aba53f | 628 | int cpu; |
aaa3c096 AC |
629 | if (TARGET_ARCHITECTURE->arch == bfd_arch_sh) |
630 | cpu = TARGET_ARCHITECTURE->mach; | |
d0aba53f AC |
631 | else |
632 | cpu = 0; | |
d0aba53f AC |
633 | /* FIXME: sh4 has more registers */ |
634 | if (cpu == bfd_mach_sh4) | |
635 | cpu = bfd_mach_sh3; | |
1e6479d4 | 636 | |
5f2f2809 SC |
637 | printf_filtered ("PC=%08x SR=%08x PR=%08x MACH=%08x MACHL=%08x\n", |
638 | read_register (PC_REGNUM), | |
639 | read_register (SR_REGNUM), | |
640 | read_register (PR_REGNUM), | |
641 | read_register (MACH_REGNUM), | |
642 | read_register (MACL_REGNUM)); | |
643 | ||
1e6479d4 KS |
644 | printf_filtered ("GBR=%08x VBR=%08x", |
645 | read_register (GBR_REGNUM), | |
646 | read_register (VBR_REGNUM)); | |
d0aba53f | 647 | if (cpu == bfd_mach_sh3 || cpu == bfd_mach_sh3e) |
1e6479d4 KS |
648 | { |
649 | printf_filtered (" SSR=%08x SPC=%08x", | |
650 | read_register (SSR_REGNUM), | |
651 | read_register (SPC_REGNUM)); | |
d0aba53f | 652 | if (cpu == bfd_mach_sh3e) |
1e6479d4 KS |
653 | { |
654 | printf_filtered (" FPUL=%08x FPSCR=%08x", | |
655 | read_register (FPUL_REGNUM), | |
656 | read_register (FPSCR_REGNUM)); | |
657 | } | |
658 | } | |
659 | ||
660 | printf_filtered ("\nR0-R7 %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
5f2f2809 SC |
661 | read_register (0), |
662 | read_register (1), | |
663 | read_register (2), | |
664 | read_register (3), | |
665 | read_register (4), | |
666 | read_register (5), | |
667 | read_register (6), | |
668 | read_register (7)); | |
669 | printf_filtered ("R8-R15 %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
670 | read_register (8), | |
671 | read_register (9), | |
672 | read_register (10), | |
673 | read_register (11), | |
674 | read_register (12), | |
675 | read_register (13), | |
676 | read_register (14), | |
677 | read_register (15)); | |
d0aba53f | 678 | if (cpu == bfd_mach_sh3e) |
1e6479d4 KS |
679 | { |
680 | printf_filtered ("FP0-FP7 %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
681 | read_register (FP0_REGNUM + 0), | |
682 | read_register (FP0_REGNUM + 1), | |
683 | read_register (FP0_REGNUM + 2), | |
684 | read_register (FP0_REGNUM + 3), | |
685 | read_register (FP0_REGNUM + 4), | |
686 | read_register (FP0_REGNUM + 5), | |
687 | read_register (FP0_REGNUM + 6), | |
688 | read_register (FP0_REGNUM + 7)); | |
689 | printf_filtered ("FP8-FP15 %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
690 | read_register (FP0_REGNUM + 8), | |
691 | read_register (FP0_REGNUM + 9), | |
692 | read_register (FP0_REGNUM + 10), | |
693 | read_register (FP0_REGNUM + 11), | |
694 | read_register (FP0_REGNUM + 12), | |
695 | read_register (FP0_REGNUM + 13), | |
696 | read_register (FP0_REGNUM + 14), | |
697 | read_register (FP0_REGNUM + 15)); | |
698 | } | |
edd01519 | 699 | } |
69992fc8 | 700 | |
dc1b349d MS |
701 | /* Function: extract_return_value |
702 | Find a function's return value in the appropriate registers (in regbuf), | |
703 | and copy it into valbuf. */ | |
704 | ||
69992fc8 MS |
705 | void |
706 | sh_extract_return_value (type, regbuf, valbuf) | |
707 | struct type *type; | |
708 | void *regbuf; | |
709 | void *valbuf; | |
710 | { | |
711 | int len = TYPE_LENGTH(type); | |
712 | ||
713 | if (len <= 4) | |
714 | memcpy (valbuf, ((char *) regbuf) + 4 - len, len); | |
715 | else if (len <= 8) | |
716 | memcpy (valbuf, ((char *) regbuf) + 8 - len, len); | |
717 | else | |
718 | error ("bad size for return value"); | |
719 | } | |
720 | ||
976bb0be | 721 | void |
df14b38b SC |
722 | _initialize_sh_tdep () |
723 | { | |
00dd4fd9 SS |
724 | struct cmd_list_element *c; |
725 | ||
18b46e7c SS |
726 | tm_print_insn = gdb_print_insn_sh; |
727 | ||
d0aba53f | 728 | target_architecture_hook = sh_target_architecture_hook; |
00dd4fd9 | 729 | |
69992fc8 | 730 | add_com ("regs", class_vars, sh_show_regs, "Print all registers"); |
df14b38b | 731 | } |