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c906108c | 1 | /* Target-dependent code for Hitachi Super-H, for GDB. |
b4a20239 AC |
2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 2000 Free Software |
3 | Foundation, Inc. | |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | /* | |
c5aa993b JM |
23 | Contributed by Steve Chamberlain |
24 | sac@cygnus.com | |
c906108c SS |
25 | */ |
26 | ||
27 | #include "defs.h" | |
28 | #include "frame.h" | |
29 | #include "obstack.h" | |
30 | #include "symtab.h" | |
31 | #include "symfile.h" | |
32 | #include "gdbtypes.h" | |
33 | #include "gdbcmd.h" | |
34 | #include "gdbcore.h" | |
35 | #include "value.h" | |
36 | #include "dis-asm.h" | |
37 | #include "inferior.h" /* for BEFORE_TEXT_END etc. */ | |
38 | #include "gdb_string.h" | |
b4a20239 | 39 | #include "arch-utils.h" |
c906108c SS |
40 | |
41 | /* A set of original names, to be used when restoring back to generic | |
42 | registers from a specific set. */ | |
9846de1b | 43 | /* *INDENT-OFF* */ |
c906108c SS |
44 | static char *sh_generic_reg_names[] = { |
45 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
46 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
47 | "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", | |
48 | "fpul", "fpscr", | |
49 | "fr0", "fr1", "fr2", "fr3", "fr4", "fr5", "fr6", "fr7", | |
50 | "fr8", "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15", | |
51 | "ssr", "spc", | |
52 | "r0b0", "r1b0", "r2b0", "r3b0", "r4b0", "r5b0", "r6b0", "r7b0", | |
53 | "r0b1", "r1b1", "r2b1", "r3b1", "r4b1", "r5b1", "r6b1", "r7b1", | |
54 | }; | |
55 | ||
56 | static char *sh_reg_names[] = { | |
57 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
58 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
59 | "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", | |
60 | "", "", | |
61 | "", "", "", "", "", "", "", "", | |
62 | "", "", "", "", "", "", "", "", | |
63 | "", "", | |
64 | "", "", "", "", "", "", "", "", | |
65 | "", "", "", "", "", "", "", "", | |
66 | }; | |
67 | ||
68 | static char *sh3_reg_names[] = { | |
69 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
70 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
71 | "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", | |
72 | "", "", | |
73 | "", "", "", "", "", "", "", "", | |
74 | "", "", "", "", "", "", "", "", | |
75 | "ssr", "spc", | |
76 | "r0b0", "r1b0", "r2b0", "r3b0", "r4b0", "r5b0", "r6b0", "r7b0", | |
77 | "r0b1", "r1b1", "r2b1", "r3b1", "r4b1", "r5b1", "r6b1", "r7b1" | |
78 | }; | |
79 | ||
80 | static char *sh3e_reg_names[] = { | |
81 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
82 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
83 | "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", | |
84 | "fpul", "fpscr", | |
85 | "fr0", "fr1", "fr2", "fr3", "fr4", "fr5", "fr6", "fr7", | |
86 | "fr8", "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15", | |
87 | "ssr", "spc", | |
88 | "r0b0", "r1b0", "r2b0", "r3b0", "r4b0", "r5b0", "r6b0", "r7b0", | |
89 | "r0b1", "r1b1", "r2b1", "r3b1", "r4b1", "r5b1", "r6b1", "r7b1", | |
90 | }; | |
63978407 JR |
91 | |
92 | static char *sh_dsp_reg_names[] = { | |
93 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
94 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
95 | "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", | |
96 | "", "dsr", | |
97 | "a0g", "a0", "a1g", "a1", "m0", "m1", "x0", "x1", | |
98 | "y0", "y1", "", "", "", "", "", "mod", | |
99 | "", "", | |
100 | "rs", "re", "", "", "", "", "", "", | |
101 | "", "", "", "", "", "", "", "", | |
102 | }; | |
103 | ||
104 | static char *sh3_dsp_reg_names[] = { | |
105 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
106 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
107 | "pc", "pr", "gbr", "vbr", "mach", "macl", "sr", | |
108 | "", "dsr", | |
109 | "a0g", "a0", "a1g", "a1", "m0", "m1", "x0", "x1", | |
110 | "y0", "y1", "", "", "", "", "", "mod", | |
111 | "ssr", "spc", | |
112 | "rs", "re", "", "", "", "", "", "", | |
113 | "r0b", "r1b", "r2b", "r3b", "r4b", "r5b", "r6b", "r7b", | |
114 | }; | |
9846de1b | 115 | /* *INDENT-ON* */ |
c906108c | 116 | |
091be84d CF |
117 | #ifdef _WIN32_WCE |
118 | char **sh_register_names = sh3_reg_names; | |
119 | #else | |
c906108c | 120 | char **sh_register_names = sh_generic_reg_names; |
091be84d | 121 | #endif |
c906108c | 122 | |
c5aa993b JM |
123 | struct |
124 | { | |
125 | char **regnames; | |
126 | int mach; | |
127 | } | |
128 | sh_processor_type_table[] = | |
129 | { | |
130 | { | |
131 | sh_reg_names, bfd_mach_sh | |
132 | } | |
133 | , | |
b71896da AC |
134 | { |
135 | sh_reg_names, bfd_mach_sh2 | |
136 | } | |
137 | , | |
63978407 JR |
138 | { |
139 | sh_dsp_reg_names, bfd_mach_sh_dsp | |
140 | } | |
141 | , | |
c5aa993b JM |
142 | { |
143 | sh3_reg_names, bfd_mach_sh3 | |
144 | } | |
145 | , | |
63978407 JR |
146 | { |
147 | sh3_dsp_reg_names, bfd_mach_sh3_dsp | |
148 | } | |
149 | , | |
c5aa993b JM |
150 | { |
151 | sh3e_reg_names, bfd_mach_sh3e | |
152 | } | |
153 | , | |
c5aa993b JM |
154 | { |
155 | NULL, 0 | |
156 | } | |
c906108c SS |
157 | }; |
158 | ||
159 | /* Prologue looks like | |
c5aa993b JM |
160 | [mov.l <regs>,@-r15]... |
161 | [sts.l pr,@-r15] | |
162 | [mov.l r14,@-r15] | |
163 | [mov r15,r14] | |
164 | */ | |
c906108c SS |
165 | |
166 | #define IS_STS(x) ((x) == 0x4f22) | |
167 | #define IS_PUSH(x) (((x) & 0xff0f) == 0x2f06) | |
168 | #define GET_PUSHED_REG(x) (((x) >> 4) & 0xf) | |
169 | #define IS_MOV_SP_FP(x) ((x) == 0x6ef3) | |
170 | #define IS_ADD_SP(x) (((x) & 0xff00) == 0x7f00) | |
171 | #define IS_MOV_R3(x) (((x) & 0xff00) == 0x1a00) | |
172 | #define IS_SHLL_R3(x) ((x) == 0x4300) | |
173 | #define IS_ADD_R3SP(x) ((x) == 0x3f3c) | |
174 | #define IS_FMOV(x) (((x) & 0xf00f) == 0xf00b) | |
175 | #define FPSCR_SZ (1 << 20) | |
176 | ||
177 | ||
178 | /* Should call_function allocate stack space for a struct return? */ | |
179 | int | |
180 | sh_use_struct_convention (gcc_p, type) | |
181 | int gcc_p; | |
182 | struct type *type; | |
183 | { | |
184 | return (TYPE_LENGTH (type) > 1); | |
185 | } | |
186 | ||
187 | ||
188 | /* Skip any prologue before the guts of a function */ | |
189 | ||
190 | CORE_ADDR | |
191 | sh_skip_prologue (start_pc) | |
192 | CORE_ADDR start_pc; | |
193 | { | |
194 | int w; | |
195 | ||
196 | w = read_memory_integer (start_pc, 2); | |
197 | while (IS_STS (w) | |
198 | || IS_FMOV (w) | |
199 | || IS_PUSH (w) | |
200 | || IS_MOV_SP_FP (w) | |
201 | || IS_MOV_R3 (w) | |
202 | || IS_ADD_R3SP (w) | |
203 | || IS_ADD_SP (w) | |
204 | || IS_SHLL_R3 (w)) | |
205 | { | |
206 | start_pc += 2; | |
207 | w = read_memory_integer (start_pc, 2); | |
208 | } | |
209 | ||
210 | return start_pc; | |
211 | } | |
212 | ||
213 | /* Disassemble an instruction. */ | |
214 | ||
215 | int | |
216 | gdb_print_insn_sh (memaddr, info) | |
217 | bfd_vma memaddr; | |
218 | disassemble_info *info; | |
219 | { | |
220 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
221 | return print_insn_sh (memaddr, info); | |
222 | else | |
223 | return print_insn_shl (memaddr, info); | |
224 | } | |
225 | ||
226 | /* Given a GDB frame, determine the address of the calling function's frame. | |
227 | This will be used to create a new GDB frame struct, and then | |
228 | INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. | |
229 | ||
230 | For us, the frame address is its stack pointer value, so we look up | |
231 | the function prologue to determine the caller's sp value, and return it. */ | |
232 | ||
233 | CORE_ADDR | |
234 | sh_frame_chain (frame) | |
235 | struct frame_info *frame; | |
236 | { | |
237 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) | |
238 | return frame->frame; /* dummy frame same as caller's frame */ | |
239 | if (!inside_entry_file (frame->pc)) | |
240 | return read_memory_integer (FRAME_FP (frame) + frame->f_offset, 4); | |
241 | else | |
242 | return 0; | |
243 | } | |
244 | ||
245 | /* Find REGNUM on the stack. Otherwise, it's in an active register. One thing | |
246 | we might want to do here is to check REGNUM against the clobber mask, and | |
247 | somehow flag it as invalid if it isn't saved on the stack somewhere. This | |
248 | would provide a graceful failure mode when trying to get the value of | |
249 | caller-saves registers for an inner frame. */ | |
250 | ||
251 | CORE_ADDR | |
252 | sh_find_callers_reg (fi, regnum) | |
253 | struct frame_info *fi; | |
254 | int regnum; | |
255 | { | |
256 | struct frame_saved_regs fsr; | |
257 | ||
258 | for (; fi; fi = fi->next) | |
259 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
260 | /* When the caller requests PR from the dummy frame, we return PC because | |
c5aa993b | 261 | that's where the previous routine appears to have done a call from. */ |
c906108c | 262 | return generic_read_register_dummy (fi->pc, fi->frame, regnum); |
c5aa993b | 263 | else |
c906108c | 264 | { |
c5aa993b | 265 | FRAME_FIND_SAVED_REGS (fi, fsr); |
c906108c | 266 | if (fsr.regs[regnum] != 0) |
c5aa993b JM |
267 | return read_memory_integer (fsr.regs[regnum], |
268 | REGISTER_RAW_SIZE (regnum)); | |
c906108c SS |
269 | } |
270 | return read_register (regnum); | |
271 | } | |
272 | ||
273 | /* Put here the code to store, into a struct frame_saved_regs, the | |
274 | addresses of the saved registers of frame described by FRAME_INFO. | |
275 | This includes special registers such as pc and fp saved in special | |
276 | ways in the stack frame. sp is even more special: the address we | |
277 | return for it IS the sp for the next frame. */ | |
278 | ||
279 | void | |
280 | sh_frame_find_saved_regs (fi, fsr) | |
281 | struct frame_info *fi; | |
282 | struct frame_saved_regs *fsr; | |
283 | { | |
284 | int where[NUM_REGS]; | |
285 | int rn; | |
286 | int have_fp = 0; | |
287 | int depth; | |
288 | int pc; | |
289 | int opc; | |
290 | int insn; | |
291 | int r3_val = 0; | |
c5aa993b | 292 | char *dummy_regs = generic_find_dummy_frame (fi->pc, fi->frame); |
c906108c SS |
293 | |
294 | if (dummy_regs) | |
295 | { | |
296 | /* DANGER! This is ONLY going to work if the char buffer format of | |
c5aa993b JM |
297 | the saved registers is byte-for-byte identical to the |
298 | CORE_ADDR regs[NUM_REGS] format used by struct frame_saved_regs! */ | |
299 | memcpy (&fsr->regs, dummy_regs, sizeof (fsr)); | |
c906108c SS |
300 | return; |
301 | } | |
302 | ||
303 | opc = pc = get_pc_function_start (fi->pc); | |
304 | ||
305 | insn = read_memory_integer (pc, 2); | |
306 | ||
307 | fi->leaf_function = 1; | |
308 | fi->f_offset = 0; | |
309 | ||
310 | for (rn = 0; rn < NUM_REGS; rn++) | |
311 | where[rn] = -1; | |
312 | ||
313 | depth = 0; | |
314 | ||
315 | /* Loop around examining the prologue insns until we find something | |
316 | that does not appear to be part of the prologue. But give up | |
317 | after 20 of them, since we're getting silly then. */ | |
318 | ||
319 | while (pc < opc + 20 * 2) | |
320 | { | |
321 | /* See where the registers will be saved to */ | |
322 | if (IS_PUSH (insn)) | |
323 | { | |
324 | pc += 2; | |
325 | rn = GET_PUSHED_REG (insn); | |
326 | where[rn] = depth; | |
327 | insn = read_memory_integer (pc, 2); | |
328 | depth += 4; | |
329 | } | |
330 | else if (IS_STS (insn)) | |
331 | { | |
332 | pc += 2; | |
333 | where[PR_REGNUM] = depth; | |
334 | insn = read_memory_integer (pc, 2); | |
335 | /* If we're storing the pr then this isn't a leaf */ | |
336 | fi->leaf_function = 0; | |
337 | depth += 4; | |
338 | } | |
339 | else if (IS_MOV_R3 (insn)) | |
340 | { | |
341 | r3_val = ((insn & 0xff) ^ 0x80) - 0x80; | |
342 | pc += 2; | |
343 | insn = read_memory_integer (pc, 2); | |
344 | } | |
345 | else if (IS_SHLL_R3 (insn)) | |
346 | { | |
347 | r3_val <<= 1; | |
348 | pc += 2; | |
349 | insn = read_memory_integer (pc, 2); | |
350 | } | |
351 | else if (IS_ADD_R3SP (insn)) | |
352 | { | |
353 | depth += -r3_val; | |
354 | pc += 2; | |
355 | insn = read_memory_integer (pc, 2); | |
356 | } | |
357 | else if (IS_ADD_SP (insn)) | |
358 | { | |
359 | pc += 2; | |
360 | depth -= ((insn & 0xff) ^ 0x80) - 0x80; | |
361 | insn = read_memory_integer (pc, 2); | |
362 | } | |
363 | else if (IS_FMOV (insn)) | |
364 | { | |
365 | pc += 2; | |
366 | insn = read_memory_integer (pc, 2); | |
367 | if (read_register (FPSCR_REGNUM) & FPSCR_SZ) | |
368 | { | |
369 | depth += 8; | |
370 | } | |
371 | else | |
372 | { | |
373 | depth += 4; | |
374 | } | |
375 | } | |
376 | else | |
377 | break; | |
378 | } | |
379 | ||
380 | /* Now we know how deep things are, we can work out their addresses */ | |
381 | ||
382 | for (rn = 0; rn < NUM_REGS; rn++) | |
383 | { | |
384 | if (where[rn] >= 0) | |
385 | { | |
386 | if (rn == FP_REGNUM) | |
387 | have_fp = 1; | |
388 | ||
389 | fsr->regs[rn] = fi->frame - where[rn] + depth - 4; | |
390 | } | |
391 | else | |
392 | { | |
393 | fsr->regs[rn] = 0; | |
394 | } | |
395 | } | |
396 | ||
397 | if (have_fp) | |
398 | { | |
399 | fsr->regs[SP_REGNUM] = read_memory_integer (fsr->regs[FP_REGNUM], 4); | |
400 | } | |
401 | else | |
402 | { | |
403 | fsr->regs[SP_REGNUM] = fi->frame - 4; | |
404 | } | |
405 | ||
406 | fi->f_offset = depth - where[FP_REGNUM] - 4; | |
407 | /* Work out the return pc - either from the saved pr or the pr | |
408 | value */ | |
409 | } | |
410 | ||
411 | /* initialize the extra info saved in a FRAME */ | |
412 | ||
413 | void | |
414 | sh_init_extra_frame_info (fromleaf, fi) | |
415 | int fromleaf; | |
416 | struct frame_info *fi; | |
417 | { | |
418 | struct frame_saved_regs fsr; | |
419 | ||
420 | if (fi->next) | |
421 | fi->pc = FRAME_SAVED_PC (fi->next); | |
422 | ||
423 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
424 | { | |
425 | /* We need to setup fi->frame here because run_stack_dummy gets it wrong | |
c5aa993b JM |
426 | by assuming it's always FP. */ |
427 | fi->frame = generic_read_register_dummy (fi->pc, fi->frame, | |
428 | SP_REGNUM); | |
429 | fi->return_pc = generic_read_register_dummy (fi->pc, fi->frame, | |
c906108c SS |
430 | PC_REGNUM); |
431 | fi->f_offset = -(CALL_DUMMY_LENGTH + 4); | |
432 | fi->leaf_function = 0; | |
433 | return; | |
434 | } | |
435 | else | |
436 | { | |
437 | FRAME_FIND_SAVED_REGS (fi, fsr); | |
438 | fi->return_pc = sh_find_callers_reg (fi, PR_REGNUM); | |
439 | } | |
440 | } | |
441 | ||
442 | /* Discard from the stack the innermost frame, | |
443 | restoring all saved registers. */ | |
444 | ||
445 | void | |
446 | sh_pop_frame () | |
447 | { | |
448 | register struct frame_info *frame = get_current_frame (); | |
449 | register CORE_ADDR fp; | |
450 | register int regnum; | |
451 | struct frame_saved_regs fsr; | |
452 | ||
453 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) | |
454 | generic_pop_dummy_frame (); | |
455 | else | |
c5aa993b JM |
456 | { |
457 | fp = FRAME_FP (frame); | |
458 | get_frame_saved_regs (frame, &fsr); | |
c906108c | 459 | |
c5aa993b JM |
460 | /* Copy regs from where they were saved in the frame */ |
461 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
462 | if (fsr.regs[regnum]) | |
463 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); | |
c906108c | 464 | |
c5aa993b JM |
465 | write_register (PC_REGNUM, frame->return_pc); |
466 | write_register (SP_REGNUM, fp + 4); | |
467 | } | |
c906108c SS |
468 | flush_cached_frames (); |
469 | } | |
470 | ||
471 | /* Function: push_arguments | |
472 | Setup the function arguments for calling a function in the inferior. | |
473 | ||
474 | On the Hitachi SH architecture, there are four registers (R4 to R7) | |
475 | which are dedicated for passing function arguments. Up to the first | |
476 | four arguments (depending on size) may go into these registers. | |
477 | The rest go on the stack. | |
478 | ||
479 | Arguments that are smaller than 4 bytes will still take up a whole | |
480 | register or a whole 32-bit word on the stack, and will be | |
481 | right-justified in the register or the stack word. This includes | |
482 | chars, shorts, and small aggregate types. | |
483 | ||
484 | Arguments that are larger than 4 bytes may be split between two or | |
485 | more registers. If there are not enough registers free, an argument | |
486 | may be passed partly in a register (or registers), and partly on the | |
487 | stack. This includes doubles, long longs, and larger aggregates. | |
488 | As far as I know, there is no upper limit to the size of aggregates | |
489 | that will be passed in this way; in other words, the convention of | |
490 | passing a pointer to a large aggregate instead of a copy is not used. | |
491 | ||
492 | An exceptional case exists for struct arguments (and possibly other | |
493 | aggregates such as arrays) if the size is larger than 4 bytes but | |
494 | not a multiple of 4 bytes. In this case the argument is never split | |
495 | between the registers and the stack, but instead is copied in its | |
496 | entirety onto the stack, AND also copied into as many registers as | |
497 | there is room for. In other words, space in registers permitting, | |
498 | two copies of the same argument are passed in. As far as I can tell, | |
499 | only the one on the stack is used, although that may be a function | |
500 | of the level of compiler optimization. I suspect this is a compiler | |
501 | bug. Arguments of these odd sizes are left-justified within the | |
502 | word (as opposed to arguments smaller than 4 bytes, which are | |
503 | right-justified). | |
c5aa993b | 504 | |
c906108c SS |
505 | |
506 | If the function is to return an aggregate type such as a struct, it | |
507 | is either returned in the normal return value register R0 (if its | |
508 | size is no greater than one byte), or else the caller must allocate | |
509 | space into which the callee will copy the return value (if the size | |
510 | is greater than one byte). In this case, a pointer to the return | |
511 | value location is passed into the callee in register R2, which does | |
512 | not displace any of the other arguments passed in via registers R4 | |
513 | to R7. */ | |
514 | ||
515 | CORE_ADDR | |
516 | sh_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
517 | int nargs; | |
518 | value_ptr *args; | |
519 | CORE_ADDR sp; | |
520 | unsigned char struct_return; | |
521 | CORE_ADDR struct_addr; | |
522 | { | |
523 | int stack_offset, stack_alloc; | |
524 | int argreg; | |
525 | int argnum; | |
526 | struct type *type; | |
527 | CORE_ADDR regval; | |
528 | char *val; | |
529 | char valbuf[4]; | |
530 | int len; | |
531 | int odd_sized_struct; | |
532 | ||
533 | /* first force sp to a 4-byte alignment */ | |
534 | sp = sp & ~3; | |
535 | ||
536 | /* The "struct return pointer" pseudo-argument has its own dedicated | |
537 | register */ | |
538 | if (struct_return) | |
c5aa993b | 539 | write_register (STRUCT_RETURN_REGNUM, struct_addr); |
c906108c SS |
540 | |
541 | /* Now make sure there's space on the stack */ | |
542 | for (argnum = 0, stack_alloc = 0; | |
543 | argnum < nargs; argnum++) | |
c5aa993b JM |
544 | stack_alloc += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3); |
545 | sp -= stack_alloc; /* make room on stack for args */ | |
c906108c SS |
546 | |
547 | ||
548 | /* Now load as many as possible of the first arguments into | |
549 | registers, and push the rest onto the stack. There are 16 bytes | |
550 | in four registers available. Loop thru args from first to last. */ | |
551 | ||
552 | argreg = ARG0_REGNUM; | |
553 | for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) | |
554 | { | |
555 | type = VALUE_TYPE (args[argnum]); | |
c5aa993b JM |
556 | len = TYPE_LENGTH (type); |
557 | memset (valbuf, 0, sizeof (valbuf)); | |
c906108c | 558 | if (len < 4) |
c5aa993b JM |
559 | { /* value gets right-justified in the register or stack word */ |
560 | memcpy (valbuf + (4 - len), | |
561 | (char *) VALUE_CONTENTS (args[argnum]), len); | |
562 | val = valbuf; | |
563 | } | |
c906108c | 564 | else |
c5aa993b | 565 | val = (char *) VALUE_CONTENTS (args[argnum]); |
c906108c SS |
566 | |
567 | if (len > 4 && (len & 3) != 0) | |
c5aa993b JM |
568 | odd_sized_struct = 1; /* such structs go entirely on stack */ |
569 | else | |
c906108c SS |
570 | odd_sized_struct = 0; |
571 | while (len > 0) | |
572 | { | |
573 | if (argreg > ARGLAST_REGNUM || odd_sized_struct) | |
c5aa993b | 574 | { /* must go on the stack */ |
c906108c SS |
575 | write_memory (sp + stack_offset, val, 4); |
576 | stack_offset += 4; | |
577 | } | |
578 | /* NOTE WELL!!!!! This is not an "else if" clause!!! | |
579 | That's because some *&^%$ things get passed on the stack | |
580 | AND in the registers! */ | |
581 | if (argreg <= ARGLAST_REGNUM) | |
c5aa993b JM |
582 | { /* there's room in a register */ |
583 | regval = extract_address (val, REGISTER_RAW_SIZE (argreg)); | |
c906108c SS |
584 | write_register (argreg++, regval); |
585 | } | |
586 | /* Store the value 4 bytes at a time. This means that things | |
587 | larger than 4 bytes may go partly in registers and partly | |
588 | on the stack. */ | |
c5aa993b JM |
589 | len -= REGISTER_RAW_SIZE (argreg); |
590 | val += REGISTER_RAW_SIZE (argreg); | |
c906108c SS |
591 | } |
592 | } | |
593 | return sp; | |
594 | } | |
595 | ||
596 | /* Function: push_return_address (pc) | |
597 | Set up the return address for the inferior function call. | |
598 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
599 | ||
600 | CORE_ADDR | |
601 | sh_push_return_address (pc, sp) | |
602 | CORE_ADDR pc; | |
603 | CORE_ADDR sp; | |
604 | { | |
605 | write_register (PR_REGNUM, CALL_DUMMY_ADDRESS ()); | |
606 | return sp; | |
607 | } | |
608 | ||
609 | /* Function: fix_call_dummy | |
610 | Poke the callee function's address into the destination part of | |
611 | the CALL_DUMMY. The address is actually stored in a data word | |
612 | following the actualy CALL_DUMMY instructions, which will load | |
613 | it into a register using PC-relative addressing. This function | |
614 | expects the CALL_DUMMY to look like this: | |
615 | ||
c5aa993b JM |
616 | mov.w @(2,PC), R8 |
617 | jsr @R8 | |
618 | nop | |
619 | trap | |
620 | <destination> | |
621 | */ | |
c906108c SS |
622 | |
623 | #if 0 | |
624 | void | |
625 | sh_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) | |
626 | char *dummy; | |
627 | CORE_ADDR pc; | |
628 | CORE_ADDR fun; | |
629 | int nargs; | |
630 | value_ptr *args; | |
631 | struct type *type; | |
632 | int gcc_p; | |
633 | { | |
634 | *(unsigned long *) (dummy + 8) = fun; | |
635 | } | |
636 | #endif | |
637 | ||
c906108c SS |
638 | |
639 | /* Modify the actual processor type. */ | |
640 | ||
641 | int | |
642 | sh_target_architecture_hook (ap) | |
643 | const bfd_arch_info_type *ap; | |
644 | { | |
645 | int i, j; | |
646 | ||
647 | if (ap->arch != bfd_arch_sh) | |
648 | return 0; | |
649 | ||
650 | for (i = 0; sh_processor_type_table[i].regnames != NULL; i++) | |
651 | { | |
652 | if (sh_processor_type_table[i].mach == ap->mach) | |
653 | { | |
654 | sh_register_names = sh_processor_type_table[i].regnames; | |
655 | return 1; | |
656 | } | |
657 | } | |
658 | ||
96baa820 | 659 | internal_error ("Architecture `%s' unreconized", ap->printable_name); |
c906108c SS |
660 | } |
661 | ||
662 | /* Print the registers in a form similar to the E7000 */ | |
663 | ||
664 | static void | |
665 | sh_show_regs (args, from_tty) | |
666 | char *args; | |
667 | int from_tty; | |
668 | { | |
669 | int cpu; | |
670 | if (TARGET_ARCHITECTURE->arch == bfd_arch_sh) | |
671 | cpu = TARGET_ARCHITECTURE->mach; | |
672 | else | |
673 | cpu = 0; | |
674 | ||
d4f3574e SS |
675 | printf_filtered ("PC=%s SR=%08lx PR=%08lx MACH=%08lx MACHL=%08lx\n", |
676 | paddr (read_register (PC_REGNUM)), | |
677 | (long) read_register (SR_REGNUM), | |
678 | (long) read_register (PR_REGNUM), | |
679 | (long) read_register (MACH_REGNUM), | |
680 | (long) read_register (MACL_REGNUM)); | |
681 | ||
682 | printf_filtered ("GBR=%08lx VBR=%08lx", | |
683 | (long) read_register (GBR_REGNUM), | |
684 | (long) read_register (VBR_REGNUM)); | |
63978407 JR |
685 | if (cpu == bfd_mach_sh3 || cpu == bfd_mach_sh3e || cpu == bfd_mach_sh3_dsp |
686 | || cpu == bfd_mach_sh4) | |
c906108c | 687 | { |
d4f3574e SS |
688 | printf_filtered (" SSR=%08lx SPC=%08lx", |
689 | (long) read_register (SSR_REGNUM), | |
690 | (long) read_register (SPC_REGNUM)); | |
63978407 | 691 | if (cpu == bfd_mach_sh3e || cpu == bfd_mach_sh4) |
c5aa993b | 692 | { |
d4f3574e SS |
693 | printf_filtered (" FPUL=%08lx FPSCR=%08lx", |
694 | (long) read_register (FPUL_REGNUM), | |
695 | (long) read_register (FPSCR_REGNUM)); | |
c5aa993b | 696 | } |
c906108c | 697 | } |
63978407 JR |
698 | if (cpu == bfd_mach_sh_dsp || cpu == bfd_mach_sh3_dsp) |
699 | printf_filtered (" DSR=%08lx", (long) read_register (DSR_REGNUM)); | |
c906108c | 700 | |
d4f3574e SS |
701 | printf_filtered ("\nR0-R7 %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", |
702 | (long) read_register (0), | |
703 | (long) read_register (1), | |
704 | (long) read_register (2), | |
705 | (long) read_register (3), | |
706 | (long) read_register (4), | |
707 | (long) read_register (5), | |
708 | (long) read_register (6), | |
709 | (long) read_register (7)); | |
710 | printf_filtered ("R8-R15 %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
711 | (long) read_register (8), | |
712 | (long) read_register (9), | |
713 | (long) read_register (10), | |
714 | (long) read_register (11), | |
715 | (long) read_register (12), | |
716 | (long) read_register (13), | |
717 | (long) read_register (14), | |
718 | (long) read_register (15)); | |
63978407 | 719 | if (cpu == bfd_mach_sh3e || cpu == bfd_mach_sh4) |
c906108c | 720 | { |
63978407 JR |
721 | int pr = cpu == bfd_mach_sh4 && (read_register (FPSCR_REGNUM) & 0x80000); |
722 | ||
723 | printf_filtered ((pr | |
724 | ? "DR0-DR6 %08lx%08lx %08lx%08lx %08lx%08lx %08lx%08lx\n" | |
725 | : "FP0-FP7 %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n"), | |
d4f3574e SS |
726 | (long) read_register (FP0_REGNUM + 0), |
727 | (long) read_register (FP0_REGNUM + 1), | |
728 | (long) read_register (FP0_REGNUM + 2), | |
729 | (long) read_register (FP0_REGNUM + 3), | |
730 | (long) read_register (FP0_REGNUM + 4), | |
731 | (long) read_register (FP0_REGNUM + 5), | |
732 | (long) read_register (FP0_REGNUM + 6), | |
733 | (long) read_register (FP0_REGNUM + 7)); | |
63978407 JR |
734 | printf_filtered ((pr |
735 | ? "DR8-DR14 %08lx%08lx %08lx%08lx %08lx%08lx %08lx%08lx\n" | |
736 | : "FP8-FP15 %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n"), | |
d4f3574e SS |
737 | (long) read_register (FP0_REGNUM + 8), |
738 | (long) read_register (FP0_REGNUM + 9), | |
739 | (long) read_register (FP0_REGNUM + 10), | |
740 | (long) read_register (FP0_REGNUM + 11), | |
741 | (long) read_register (FP0_REGNUM + 12), | |
742 | (long) read_register (FP0_REGNUM + 13), | |
743 | (long) read_register (FP0_REGNUM + 14), | |
744 | (long) read_register (FP0_REGNUM + 15)); | |
c906108c | 745 | } |
63978407 JR |
746 | /* FIXME: sh4 has more registers */ |
747 | if (cpu == bfd_mach_sh_dsp || cpu == bfd_mach_sh3_dsp) | |
748 | { | |
749 | printf_filtered ("A0G=%02lx A0=%08lx M0=%08lx X0=%08lx Y0=%08lx RS=%08lx MOD=%08lx\n", | |
750 | (long) read_register (A0G_REGNUM) & 0xff, | |
751 | (long) read_register (A0_REGNUM), | |
752 | (long) read_register (M0_REGNUM), | |
753 | (long) read_register (X0_REGNUM), | |
754 | (long) read_register (Y0_REGNUM), | |
755 | (long) read_register (RS_REGNUM), | |
756 | (long) read_register (MOD_REGNUM)); | |
757 | printf_filtered ("A1G=%02lx A1=%08lx M1=%08lx X1=%08lx Y1=%08lx RE=%08lx\n", | |
758 | (long) read_register (A1G_REGNUM) & 0xff, | |
759 | (long) read_register (A1_REGNUM), | |
760 | (long) read_register (M1_REGNUM), | |
761 | (long) read_register (X1_REGNUM), | |
762 | (long) read_register (Y1_REGNUM), | |
763 | (long) read_register (RE_REGNUM)); | |
764 | } | |
c906108c SS |
765 | } |
766 | ||
767 | /* Function: extract_return_value | |
768 | Find a function's return value in the appropriate registers (in regbuf), | |
769 | and copy it into valbuf. */ | |
770 | ||
771 | void | |
772 | sh_extract_return_value (type, regbuf, valbuf) | |
773 | struct type *type; | |
774 | void *regbuf; | |
775 | void *valbuf; | |
776 | { | |
c5aa993b | 777 | int len = TYPE_LENGTH (type); |
c906108c SS |
778 | |
779 | if (len <= 4) | |
780 | memcpy (valbuf, ((char *) regbuf) + 4 - len, len); | |
781 | else if (len <= 8) | |
782 | memcpy (valbuf, ((char *) regbuf) + 8 - len, len); | |
783 | else | |
784 | error ("bad size for return value"); | |
785 | } | |
786 | ||
787 | void | |
788 | _initialize_sh_tdep () | |
789 | { | |
790 | struct cmd_list_element *c; | |
791 | ||
792 | tm_print_insn = gdb_print_insn_sh; | |
793 | ||
794 | target_architecture_hook = sh_target_architecture_hook; | |
795 | ||
796 | add_com ("regs", class_vars, sh_show_regs, "Print all registers"); | |
797 | } |