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c906108c | 1 | /* Target-machine dependent code for Hitachi H8/300, for GDB. |
b6ba6518 KB |
2 | Copyright 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, |
3 | 2000, 2001 Free Software 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 "dis-asm.h" | |
32 | #include "gdbcmd.h" | |
33 | #include "gdbtypes.h" | |
34 | #include "gdbcore.h" | |
35 | #include "gdb_string.h" | |
36 | #include "value.h" | |
4e052eda | 37 | #include "regcache.h" |
c906108c SS |
38 | |
39 | extern int h8300hmode, h8300smode; | |
40 | ||
41 | #undef NUM_REGS | |
42 | #define NUM_REGS 11 | |
43 | ||
44 | #define UNSIGNED_SHORT(X) ((X) & 0xffff) | |
45 | ||
46 | #define IS_PUSH(x) ((x & 0xfff0)==0x6df0) | |
47 | #define IS_PUSH_FP(x) (x == 0x6df6) | |
48 | #define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6) | |
49 | #define IS_MOV_SP_FP(x) (x == 0x0d76 || x == 0x0ff6) | |
50 | #define IS_SUB2_SP(x) (x==0x1b87) | |
51 | #define IS_SUB4_SP(x) (x==0x1b97) | |
52 | #define IS_SUBL_SP(x) (x==0x7a37) | |
53 | #define IS_MOVK_R5(x) (x==0x7905) | |
54 | #define IS_SUB_R5SP(x) (x==0x1957) | |
55 | ||
56 | ||
57 | /* The register names change depending on whether the h8300h processor | |
58 | type is selected. */ | |
59 | ||
60 | static char *original_register_names[] = REGISTER_NAMES; | |
61 | ||
62 | static char *h8300h_register_names[] = | |
c5aa993b JM |
63 | {"er0", "er1", "er2", "er3", "er4", "er5", "er6", |
64 | "sp", "ccr", "pc", "cycles", "tick", "inst"}; | |
c906108c SS |
65 | |
66 | char **h8300_register_names = original_register_names; | |
67 | ||
68 | ||
69 | /* Local function declarations. */ | |
70 | ||
71 | static CORE_ADDR examine_prologue (); | |
a14ed312 | 72 | static void set_machine_hook (char *filename); |
c906108c SS |
73 | |
74 | void h8300_frame_find_saved_regs (); | |
75 | ||
c5aa993b | 76 | CORE_ADDR |
fba45db2 | 77 | h8300_skip_prologue (CORE_ADDR start_pc) |
c906108c SS |
78 | { |
79 | short int w; | |
80 | int adjust = 0; | |
81 | ||
82 | /* Skip past all push and stm insns. */ | |
83 | while (1) | |
84 | { | |
85 | w = read_memory_unsigned_integer (start_pc, 2); | |
86 | /* First look for push insns. */ | |
87 | if (w == 0x0100 || w == 0x0110 || w == 0x0120 || w == 0x0130) | |
88 | { | |
89 | w = read_memory_unsigned_integer (start_pc + 2, 2); | |
90 | adjust = 2; | |
91 | } | |
92 | ||
93 | if (IS_PUSH (w)) | |
94 | { | |
95 | start_pc += 2 + adjust; | |
96 | w = read_memory_unsigned_integer (start_pc, 2); | |
97 | continue; | |
98 | } | |
99 | adjust = 0; | |
100 | break; | |
101 | } | |
102 | ||
103 | /* Skip past a move to FP, either word or long sized */ | |
104 | w = read_memory_unsigned_integer (start_pc, 2); | |
105 | if (w == 0x0100) | |
106 | { | |
107 | w = read_memory_unsigned_integer (start_pc + 2, 2); | |
108 | adjust += 2; | |
109 | } | |
110 | ||
111 | if (IS_MOVE_FP (w)) | |
112 | { | |
113 | start_pc += 2 + adjust; | |
114 | w = read_memory_unsigned_integer (start_pc, 2); | |
115 | } | |
116 | ||
117 | /* Check for loading either a word constant into r5; | |
118 | long versions are handled by the SUBL_SP below. */ | |
119 | if (IS_MOVK_R5 (w)) | |
120 | { | |
121 | start_pc += 2; | |
122 | w = read_memory_unsigned_integer (start_pc, 2); | |
123 | } | |
124 | ||
125 | /* Now check for subtracting r5 from sp, word sized only. */ | |
126 | if (IS_SUB_R5SP (w)) | |
127 | { | |
128 | start_pc += 2 + adjust; | |
129 | w = read_memory_unsigned_integer (start_pc, 2); | |
130 | } | |
131 | ||
132 | /* Check for subs #2 and subs #4. */ | |
133 | while (IS_SUB2_SP (w) || IS_SUB4_SP (w)) | |
134 | { | |
135 | start_pc += 2 + adjust; | |
136 | w = read_memory_unsigned_integer (start_pc, 2); | |
137 | } | |
138 | ||
139 | /* Check for a 32bit subtract. */ | |
140 | if (IS_SUBL_SP (w)) | |
141 | start_pc += 6 + adjust; | |
142 | ||
143 | return start_pc; | |
144 | } | |
145 | ||
146 | int | |
fba45db2 | 147 | gdb_print_insn_h8300 (bfd_vma memaddr, disassemble_info *info) |
c906108c SS |
148 | { |
149 | if (h8300smode) | |
150 | return print_insn_h8300s (memaddr, info); | |
151 | else if (h8300hmode) | |
152 | return print_insn_h8300h (memaddr, info); | |
153 | else | |
154 | return print_insn_h8300 (memaddr, info); | |
155 | } | |
156 | ||
157 | /* Given a GDB frame, determine the address of the calling function's frame. | |
158 | This will be used to create a new GDB frame struct, and then | |
159 | INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. | |
160 | ||
161 | For us, the frame address is its stack pointer value, so we look up | |
162 | the function prologue to determine the caller's sp value, and return it. */ | |
163 | ||
164 | CORE_ADDR | |
fba45db2 | 165 | h8300_frame_chain (struct frame_info *thisframe) |
c906108c | 166 | { |
c5aa993b JM |
167 | if (PC_IN_CALL_DUMMY (thisframe->pc, thisframe->frame, thisframe->frame)) |
168 | { /* initialize the from_pc now */ | |
c906108c | 169 | thisframe->from_pc = generic_read_register_dummy (thisframe->pc, |
c5aa993b | 170 | thisframe->frame, |
c906108c SS |
171 | PC_REGNUM); |
172 | return thisframe->frame; | |
173 | } | |
174 | h8300_frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0); | |
175 | return thisframe->fsr->regs[SP_REGNUM]; | |
176 | } | |
177 | ||
178 | /* Put here the code to store, into a struct frame_saved_regs, | |
179 | the addresses of the saved registers of frame described by FRAME_INFO. | |
180 | This includes special registers such as pc and fp saved in special | |
181 | ways in the stack frame. sp is even more special: | |
182 | the address we return for it IS the sp for the next frame. | |
183 | ||
184 | We cache the result of doing this in the frame_obstack, since it is | |
185 | fairly expensive. */ | |
186 | ||
187 | void | |
fba45db2 KB |
188 | h8300_frame_find_saved_regs (struct frame_info *fi, |
189 | struct frame_saved_regs *fsr) | |
c906108c SS |
190 | { |
191 | register struct frame_saved_regs *cache_fsr; | |
192 | CORE_ADDR ip; | |
193 | struct symtab_and_line sal; | |
194 | CORE_ADDR limit; | |
195 | ||
196 | if (!fi->fsr) | |
197 | { | |
198 | cache_fsr = (struct frame_saved_regs *) | |
199 | frame_obstack_alloc (sizeof (struct frame_saved_regs)); | |
200 | memset (cache_fsr, '\0', sizeof (struct frame_saved_regs)); | |
201 | ||
202 | fi->fsr = cache_fsr; | |
203 | ||
c5aa993b JM |
204 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
205 | { /* no more to do. */ | |
c906108c SS |
206 | if (fsr) |
207 | *fsr = *fi->fsr; | |
208 | return; | |
209 | } | |
210 | /* Find the start and end of the function prologue. If the PC | |
c5aa993b JM |
211 | is in the function prologue, we only consider the part that |
212 | has executed already. */ | |
c906108c SS |
213 | |
214 | ip = get_pc_function_start (fi->pc); | |
215 | sal = find_pc_line (ip, 0); | |
216 | limit = (sal.end && sal.end < fi->pc) ? sal.end : fi->pc; | |
217 | ||
218 | /* This will fill in fields in *fi as well as in cache_fsr. */ | |
219 | examine_prologue (ip, limit, fi->frame, cache_fsr, fi); | |
220 | } | |
221 | ||
222 | if (fsr) | |
223 | *fsr = *fi->fsr; | |
224 | } | |
225 | ||
226 | /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or | |
227 | is not the address of a valid instruction, the address of the next | |
228 | instruction beyond ADDR otherwise. *PWORD1 receives the first word | |
c5aa993b | 229 | of the instruction. */ |
c906108c SS |
230 | |
231 | CORE_ADDR | |
fba45db2 | 232 | NEXT_PROLOGUE_INSN (CORE_ADDR addr, CORE_ADDR lim, INSN_WORD *pword1) |
c906108c SS |
233 | { |
234 | char buf[2]; | |
235 | if (addr < lim + 8) | |
236 | { | |
237 | read_memory (addr, buf, 2); | |
238 | *pword1 = extract_signed_integer (buf, 2); | |
239 | ||
240 | return addr + 2; | |
241 | } | |
242 | return 0; | |
243 | } | |
244 | ||
245 | /* Examine the prologue of a function. `ip' points to the first instruction. | |
246 | `limit' is the limit of the prologue (e.g. the addr of the first | |
247 | linenumber, or perhaps the program counter if we're stepping through). | |
248 | `frame_sp' is the stack pointer value in use in this frame. | |
249 | `fsr' is a pointer to a frame_saved_regs structure into which we put | |
250 | info about the registers saved by this frame. | |
251 | `fi' is a struct frame_info pointer; we fill in various fields in it | |
252 | to reflect the offsets of the arg pointer and the locals pointer. */ | |
253 | ||
254 | static CORE_ADDR | |
fba45db2 KB |
255 | examine_prologue (register CORE_ADDR ip, register CORE_ADDR limit, |
256 | CORE_ADDR after_prolog_fp, struct frame_saved_regs *fsr, | |
257 | struct frame_info *fi) | |
c906108c SS |
258 | { |
259 | register CORE_ADDR next_ip; | |
260 | int r; | |
261 | int have_fp = 0; | |
262 | INSN_WORD insn_word; | |
263 | /* Number of things pushed onto stack, starts at 2/4, 'cause the | |
264 | PC is already there */ | |
265 | unsigned int reg_save_depth = h8300hmode ? 4 : 2; | |
266 | ||
267 | unsigned int auto_depth = 0; /* Number of bytes of autos */ | |
268 | ||
269 | char in_frame[11]; /* One for each reg */ | |
270 | ||
271 | int adjust = 0; | |
272 | ||
273 | memset (in_frame, 1, 11); | |
274 | for (r = 0; r < 8; r++) | |
275 | { | |
276 | fsr->regs[r] = 0; | |
277 | } | |
278 | if (after_prolog_fp == 0) | |
279 | { | |
280 | after_prolog_fp = read_register (SP_REGNUM); | |
281 | } | |
282 | ||
283 | /* If the PC isn't valid, quit now. */ | |
284 | if (ip == 0 || ip & (h8300hmode ? ~0xffffff : ~0xffff)) | |
285 | return 0; | |
286 | ||
287 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
288 | ||
289 | if (insn_word == 0x0100) | |
290 | { | |
291 | insn_word = read_memory_unsigned_integer (ip + 2, 2); | |
292 | adjust = 2; | |
293 | } | |
294 | ||
295 | /* Skip over any fp push instructions */ | |
296 | fsr->regs[6] = after_prolog_fp; | |
297 | while (next_ip && IS_PUSH_FP (insn_word)) | |
298 | { | |
299 | ip = next_ip + adjust; | |
300 | ||
301 | in_frame[insn_word & 0x7] = reg_save_depth; | |
302 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
303 | reg_save_depth += 2 + adjust; | |
304 | } | |
305 | ||
306 | /* Is this a move into the fp */ | |
307 | if (next_ip && IS_MOV_SP_FP (insn_word)) | |
308 | { | |
309 | ip = next_ip; | |
310 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
311 | have_fp = 1; | |
312 | } | |
313 | ||
314 | /* Skip over any stack adjustment, happens either with a number of | |
315 | sub#2,sp or a mov #x,r5 sub r5,sp */ | |
316 | ||
317 | if (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word))) | |
318 | { | |
319 | while (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word))) | |
320 | { | |
321 | auto_depth += IS_SUB2_SP (insn_word) ? 2 : 4; | |
322 | ip = next_ip; | |
323 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
324 | } | |
325 | } | |
326 | else | |
327 | { | |
328 | if (next_ip && IS_MOVK_R5 (insn_word)) | |
329 | { | |
330 | ip = next_ip; | |
331 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
332 | auto_depth += insn_word; | |
333 | ||
334 | next_ip = NEXT_PROLOGUE_INSN (next_ip, limit, &insn_word); | |
335 | auto_depth += insn_word; | |
336 | } | |
337 | if (next_ip && IS_SUBL_SP (insn_word)) | |
338 | { | |
339 | ip = next_ip; | |
340 | auto_depth += read_memory_unsigned_integer (ip, 4); | |
341 | ip += 4; | |
342 | ||
343 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
344 | } | |
345 | } | |
346 | ||
347 | /* Now examine the push insns to determine where everything lives | |
348 | on the stack. */ | |
349 | while (1) | |
350 | { | |
351 | adjust = 0; | |
352 | if (!next_ip) | |
353 | break; | |
354 | ||
355 | if (insn_word == 0x0100) | |
356 | { | |
357 | ip = next_ip; | |
358 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
359 | adjust = 2; | |
360 | } | |
361 | ||
362 | if (IS_PUSH (insn_word)) | |
363 | { | |
364 | ip = next_ip; | |
365 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
366 | fsr->regs[r] = after_prolog_fp + auto_depth; | |
367 | auto_depth += 2 + adjust; | |
368 | continue; | |
369 | } | |
370 | ||
371 | /* Now check for push multiple insns. */ | |
372 | if (insn_word == 0x0110 || insn_word == 0x0120 || insn_word == 0x0130) | |
373 | { | |
374 | int count = ((insn_word >> 4) & 0xf) + 1; | |
375 | int start, i; | |
376 | ||
377 | ip = next_ip; | |
378 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
379 | start = insn_word & 0x7; | |
380 | ||
381 | for (i = start; i <= start + count; i++) | |
382 | { | |
383 | fsr->regs[i] = after_prolog_fp + auto_depth; | |
384 | auto_depth += 4; | |
385 | } | |
386 | } | |
387 | break; | |
388 | } | |
389 | ||
390 | /* The args are always reffed based from the stack pointer */ | |
391 | fi->args_pointer = after_prolog_fp; | |
392 | /* Locals are always reffed based from the fp */ | |
393 | fi->locals_pointer = after_prolog_fp; | |
394 | /* The PC is at a known place */ | |
395 | fi->from_pc = read_memory_unsigned_integer (after_prolog_fp + BINWORD, BINWORD); | |
396 | ||
397 | /* Rememeber any others too */ | |
398 | in_frame[PC_REGNUM] = 0; | |
c5aa993b | 399 | |
c906108c SS |
400 | if (have_fp) |
401 | /* We keep the old FP in the SP spot */ | |
402 | fsr->regs[SP_REGNUM] = read_memory_unsigned_integer (fsr->regs[6], BINWORD); | |
403 | else | |
404 | fsr->regs[SP_REGNUM] = after_prolog_fp + auto_depth; | |
405 | ||
406 | return (ip); | |
407 | } | |
408 | ||
409 | void | |
fba45db2 | 410 | h8300_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
c906108c SS |
411 | { |
412 | fi->fsr = 0; /* Not yet allocated */ | |
413 | fi->args_pointer = 0; /* Unknown */ | |
414 | fi->locals_pointer = 0; /* Unknown */ | |
415 | fi->from_pc = 0; | |
c5aa993b JM |
416 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
417 | { /* anything special to do? */ | |
c906108c SS |
418 | return; |
419 | } | |
420 | } | |
421 | ||
422 | /* Return the saved PC from this frame. | |
423 | ||
424 | If the frame has a memory copy of SRP_REGNUM, use that. If not, | |
425 | just use the register SRP_REGNUM itself. */ | |
426 | ||
427 | CORE_ADDR | |
fba45db2 | 428 | h8300_frame_saved_pc (struct frame_info *frame) |
c906108c | 429 | { |
c5aa993b | 430 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
c906108c SS |
431 | return generic_read_register_dummy (frame->pc, frame->frame, PC_REGNUM); |
432 | else | |
433 | return frame->from_pc; | |
434 | } | |
435 | ||
436 | CORE_ADDR | |
fba45db2 | 437 | frame_locals_address (struct frame_info *fi) |
c906108c | 438 | { |
c5aa993b | 439 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
c906108c SS |
440 | return (CORE_ADDR) 0; /* Not sure what else to do... */ |
441 | if (!fi->locals_pointer) | |
442 | { | |
443 | struct frame_saved_regs ignore; | |
444 | ||
445 | get_frame_saved_regs (fi, &ignore); | |
446 | ||
447 | } | |
448 | return fi->locals_pointer; | |
449 | } | |
450 | ||
451 | /* Return the address of the argument block for the frame | |
452 | described by FI. Returns 0 if the address is unknown. */ | |
453 | ||
454 | CORE_ADDR | |
fba45db2 | 455 | frame_args_address (struct frame_info *fi) |
c906108c | 456 | { |
c5aa993b | 457 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
c906108c SS |
458 | return (CORE_ADDR) 0; /* Not sure what else to do... */ |
459 | if (!fi->args_pointer) | |
460 | { | |
461 | struct frame_saved_regs ignore; | |
462 | ||
463 | get_frame_saved_regs (fi, &ignore); | |
464 | ||
465 | } | |
466 | ||
467 | return fi->args_pointer; | |
468 | } | |
469 | ||
470 | /* Function: push_arguments | |
471 | Setup the function arguments for calling a function in the inferior. | |
472 | ||
473 | On the Hitachi H8/300 architecture, there are three registers (R0 to R2) | |
474 | which are dedicated for passing function arguments. Up to the first | |
475 | three arguments (depending on size) may go into these registers. | |
476 | The rest go on the stack. | |
477 | ||
478 | Arguments that are smaller than WORDSIZE bytes will still take up a | |
479 | whole register or a whole WORDSIZE word on the stack, and will be | |
480 | right-justified in the register or the stack word. This includes | |
481 | chars and small aggregate types. Note that WORDSIZE depends on the | |
482 | cpu type. | |
483 | ||
484 | Arguments that are larger than WORDSIZE bytes will be split between | |
485 | two or more registers as available, but will NOT be split between a | |
486 | register and the stack. | |
487 | ||
488 | An exceptional case exists for struct arguments (and possibly other | |
489 | aggregates such as arrays) -- if the size is larger than WORDSIZE | |
490 | bytes but not a multiple of WORDSIZE bytes. In this case the | |
491 | argument is never split between the registers and the stack, but | |
492 | instead is copied in its entirety onto the stack, AND also copied | |
493 | into as many registers as there is room for. In other words, space | |
494 | in registers permitting, two copies of the same argument are passed | |
495 | in. As far as I can tell, only the one on the stack is used, | |
496 | although that may be a function of the level of compiler | |
497 | optimization. I suspect this is a compiler bug. Arguments of | |
498 | these odd sizes are left-justified within the word (as opposed to | |
499 | arguments smaller than WORDSIZE bytes, which are right-justified). | |
c5aa993b | 500 | |
c906108c SS |
501 | If the function is to return an aggregate type such as a struct, |
502 | the caller must allocate space into which the callee will copy the | |
503 | return value. In this case, a pointer to the return value location | |
504 | is passed into the callee in register R0, which displaces one of | |
505 | the other arguments passed in via registers R0 to R2. */ | |
506 | ||
507 | CORE_ADDR | |
fba45db2 KB |
508 | h8300_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
509 | unsigned char struct_return, CORE_ADDR struct_addr) | |
c906108c SS |
510 | { |
511 | int stack_align, stack_alloc, stack_offset; | |
512 | int wordsize; | |
513 | int argreg; | |
514 | int argnum; | |
515 | struct type *type; | |
516 | CORE_ADDR regval; | |
517 | char *val; | |
518 | char valbuf[4]; | |
519 | int len; | |
520 | ||
521 | if (h8300hmode || h8300smode) | |
522 | { | |
523 | stack_align = 3; | |
c5aa993b | 524 | wordsize = 4; |
c906108c SS |
525 | } |
526 | else | |
527 | { | |
528 | stack_align = 1; | |
c5aa993b | 529 | wordsize = 2; |
c906108c SS |
530 | } |
531 | ||
532 | /* first force sp to a n-byte alignment */ | |
533 | sp = sp & ~stack_align; | |
534 | ||
535 | /* Now make sure there's space on the stack */ | |
c5aa993b | 536 | for (argnum = 0, stack_alloc = 0; |
c906108c | 537 | argnum < nargs; argnum++) |
c5aa993b | 538 | stack_alloc += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + stack_align) |
c906108c | 539 | & ~stack_align); |
c5aa993b | 540 | sp -= stack_alloc; /* make room on stack for args */ |
c906108c SS |
541 | /* we may over-allocate a little here, but that won't hurt anything */ |
542 | ||
c5aa993b JM |
543 | argreg = ARG0_REGNUM; |
544 | if (struct_return) /* "struct return" pointer takes up one argreg */ | |
c906108c SS |
545 | { |
546 | write_register (argreg++, struct_addr); | |
547 | } | |
548 | ||
549 | /* Now load as many as possible of the first arguments into | |
550 | registers, and push the rest onto the stack. There are 3N bytes | |
551 | in three registers available. Loop thru args from first to last. */ | |
552 | ||
553 | for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) | |
554 | { | |
555 | type = VALUE_TYPE (args[argnum]); | |
556 | len = TYPE_LENGTH (type); | |
c5aa993b | 557 | memset (valbuf, 0, sizeof (valbuf)); |
c906108c SS |
558 | if (len < wordsize) |
559 | { | |
560 | /* the purpose of this is to right-justify the value within the word */ | |
c5aa993b JM |
561 | memcpy (valbuf + (wordsize - len), |
562 | (char *) VALUE_CONTENTS (args[argnum]), len); | |
c906108c SS |
563 | val = valbuf; |
564 | } | |
565 | else | |
566 | val = (char *) VALUE_CONTENTS (args[argnum]); | |
567 | ||
c5aa993b JM |
568 | if (len > (ARGLAST_REGNUM + 1 - argreg) * REGISTER_RAW_SIZE (ARG0_REGNUM) || |
569 | (len > wordsize && (len & stack_align) != 0)) | |
570 | { /* passed on the stack */ | |
571 | write_memory (sp + stack_offset, val, | |
c906108c SS |
572 | len < wordsize ? wordsize : len); |
573 | stack_offset += (len + stack_align) & ~stack_align; | |
574 | } | |
575 | /* NOTE WELL!!!!! This is not an "else if" clause!!! | |
c5aa993b JM |
576 | That's because some *&^%$ things get passed on the stack |
577 | AND in the registers! */ | |
578 | if (len <= (ARGLAST_REGNUM + 1 - argreg) * REGISTER_RAW_SIZE (ARG0_REGNUM)) | |
c906108c | 579 | while (len > 0) |
c5aa993b | 580 | { /* there's room in registers */ |
c906108c SS |
581 | regval = extract_address (val, wordsize); |
582 | write_register (argreg, regval); | |
583 | len -= wordsize; | |
584 | val += wordsize; | |
585 | argreg++; | |
586 | } | |
587 | } | |
588 | return sp; | |
589 | } | |
590 | ||
591 | /* Function: push_return_address | |
592 | Setup the return address for a dummy frame, as called by | |
593 | call_function_by_hand. Only necessary when you are using an | |
594 | empty CALL_DUMMY, ie. the target will not actually be executing | |
595 | a JSR/BSR instruction. */ | |
596 | ||
597 | CORE_ADDR | |
fba45db2 | 598 | h8300_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
c906108c SS |
599 | { |
600 | unsigned char buf[4]; | |
601 | int wordsize; | |
602 | ||
603 | if (h8300hmode || h8300smode) | |
604 | wordsize = 4; | |
605 | else | |
606 | wordsize = 2; | |
607 | ||
608 | sp -= wordsize; | |
609 | store_unsigned_integer (buf, wordsize, CALL_DUMMY_ADDRESS ()); | |
610 | write_memory (sp, buf, wordsize); | |
611 | return sp; | |
612 | } | |
613 | ||
614 | /* Function: pop_frame | |
615 | Restore the machine to the state it had before the current frame | |
616 | was created. Usually used either by the "RETURN" command, or by | |
617 | call_function_by_hand after the dummy_frame is finished. */ | |
618 | ||
c5aa993b | 619 | void |
fba45db2 | 620 | h8300_pop_frame (void) |
c906108c SS |
621 | { |
622 | unsigned regnum; | |
623 | struct frame_saved_regs fsr; | |
624 | struct frame_info *frame = get_current_frame (); | |
625 | ||
c5aa993b | 626 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
c906108c | 627 | { |
c5aa993b | 628 | generic_pop_dummy_frame (); |
c906108c SS |
629 | } |
630 | else | |
631 | { | |
632 | get_frame_saved_regs (frame, &fsr); | |
633 | ||
634 | for (regnum = 0; regnum < 8; regnum++) | |
635 | { | |
636 | /* Don't forget SP_REGNUM is a frame_saved_regs struct is the | |
637 | actual value we want, not the address of the value we want. */ | |
638 | if (fsr.regs[regnum] && regnum != SP_REGNUM) | |
c5aa993b JM |
639 | write_register (regnum, |
640 | read_memory_integer (fsr.regs[regnum], BINWORD)); | |
c906108c SS |
641 | else if (fsr.regs[regnum] && regnum == SP_REGNUM) |
642 | write_register (regnum, frame->frame + 2 * BINWORD); | |
643 | } | |
644 | ||
645 | /* Don't forget the update the PC too! */ | |
646 | write_pc (frame->from_pc); | |
647 | } | |
648 | flush_cached_frames (); | |
649 | } | |
650 | ||
651 | /* Function: extract_return_value | |
652 | Figure out where in REGBUF the called function has left its return value. | |
653 | Copy that into VALBUF. Be sure to account for CPU type. */ | |
654 | ||
655 | void | |
fba45db2 | 656 | h8300_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
c906108c SS |
657 | { |
658 | int wordsize, len; | |
659 | ||
660 | if (h8300smode || h8300hmode) | |
661 | wordsize = 4; | |
662 | else | |
663 | wordsize = 2; | |
664 | ||
c5aa993b JM |
665 | len = TYPE_LENGTH (type); |
666 | ||
667 | switch (len) | |
668 | { | |
669 | case 1: /* (char) */ | |
670 | case 2: /* (short), (int) */ | |
671 | memcpy (valbuf, regbuf + REGISTER_BYTE (0) + (wordsize - len), len); | |
672 | break; | |
673 | case 4: /* (long), (float) */ | |
674 | if (h8300smode || h8300hmode) | |
675 | { | |
676 | memcpy (valbuf, regbuf + REGISTER_BYTE (0), 4); | |
677 | } | |
678 | else | |
679 | { | |
680 | memcpy (valbuf, regbuf + REGISTER_BYTE (0), 2); | |
681 | memcpy (valbuf + 2, regbuf + REGISTER_BYTE (1), 2); | |
682 | } | |
683 | break; | |
684 | case 8: /* (double) (doesn't seem to happen, which is good, | |
685 | because this almost certainly isn't right. */ | |
686 | error ("I don't know how a double is returned."); | |
687 | break; | |
688 | } | |
c906108c SS |
689 | } |
690 | ||
691 | /* Function: store_return_value | |
692 | Place the appropriate value in the appropriate registers. | |
693 | Primarily used by the RETURN command. */ | |
694 | ||
c5aa993b | 695 | void |
fba45db2 | 696 | h8300_store_return_value (struct type *type, char *valbuf) |
c906108c SS |
697 | { |
698 | int wordsize, len, regval; | |
c5aa993b | 699 | |
c906108c SS |
700 | if (h8300hmode || h8300smode) |
701 | wordsize = 4; | |
702 | else | |
703 | wordsize = 2; | |
704 | ||
c5aa993b JM |
705 | len = TYPE_LENGTH (type); |
706 | switch (len) | |
707 | { | |
708 | case 1: /* char */ | |
709 | case 2: /* short, int */ | |
710 | regval = extract_address (valbuf, len); | |
711 | write_register (0, regval); | |
712 | break; | |
713 | case 4: /* long, float */ | |
714 | regval = extract_address (valbuf, len); | |
715 | if (h8300smode || h8300hmode) | |
716 | { | |
717 | write_register (0, regval); | |
718 | } | |
719 | else | |
720 | { | |
721 | write_register (0, regval >> 16); | |
722 | write_register (1, regval & 0xffff); | |
723 | } | |
724 | break; | |
725 | case 8: /* presumeably double, but doesn't seem to happen */ | |
726 | error ("I don't know how to return a double."); | |
727 | break; | |
728 | } | |
c906108c SS |
729 | } |
730 | ||
c906108c SS |
731 | struct cmd_list_element *setmemorylist; |
732 | ||
733 | static void | |
fba45db2 | 734 | set_register_names (void) |
c906108c SS |
735 | { |
736 | if (h8300hmode != 0) | |
737 | h8300_register_names = h8300h_register_names; | |
738 | else | |
739 | h8300_register_names = original_register_names; | |
740 | } | |
741 | ||
742 | static void | |
55d80160 | 743 | h8300_command (char *args, int from_tty) |
c906108c SS |
744 | { |
745 | extern int h8300hmode; | |
746 | h8300hmode = 0; | |
747 | h8300smode = 0; | |
748 | set_register_names (); | |
749 | } | |
750 | ||
751 | static void | |
55d80160 | 752 | h8300h_command (char *args, int from_tty) |
c906108c SS |
753 | { |
754 | extern int h8300hmode; | |
755 | h8300hmode = 1; | |
756 | h8300smode = 0; | |
757 | set_register_names (); | |
758 | } | |
759 | ||
760 | static void | |
55d80160 | 761 | h8300s_command (char *args, int from_tty) |
c906108c SS |
762 | { |
763 | extern int h8300smode; | |
764 | extern int h8300hmode; | |
765 | h8300smode = 1; | |
766 | h8300hmode = 1; | |
767 | set_register_names (); | |
768 | } | |
769 | ||
770 | ||
c5aa993b | 771 | static void |
fba45db2 | 772 | set_machine (char *args, int from_tty) |
c906108c SS |
773 | { |
774 | printf_unfiltered ("\"set machine\" must be followed by h8300, h8300h"); | |
775 | printf_unfiltered ("or h8300s"); | |
776 | help_list (setmemorylist, "set memory ", -1, gdb_stdout); | |
777 | } | |
778 | ||
779 | /* set_machine_hook is called as the exec file is being opened, but | |
780 | before the symbol file is opened. This allows us to set the | |
781 | h8300hmode flag based on the machine type specified in the exec | |
782 | file. This in turn will cause subsequently defined pointer types | |
783 | to be 16 or 32 bits as appropriate for the machine. */ | |
784 | ||
785 | static void | |
fba45db2 | 786 | set_machine_hook (char *filename) |
c906108c SS |
787 | { |
788 | if (bfd_get_mach (exec_bfd) == bfd_mach_h8300s) | |
789 | { | |
790 | h8300smode = 1; | |
791 | h8300hmode = 1; | |
792 | } | |
c5aa993b | 793 | else if (bfd_get_mach (exec_bfd) == bfd_mach_h8300h) |
c906108c SS |
794 | { |
795 | h8300smode = 0; | |
796 | h8300hmode = 1; | |
797 | } | |
798 | else | |
799 | { | |
800 | h8300smode = 0; | |
801 | h8300hmode = 0; | |
802 | } | |
803 | set_register_names (); | |
804 | } | |
805 | ||
806 | void | |
fba45db2 | 807 | _initialize_h8300m (void) |
c906108c SS |
808 | { |
809 | add_prefix_cmd ("machine", no_class, set_machine, | |
c5aa993b | 810 | "set the machine type", |
c906108c SS |
811 | &setmemorylist, "set machine ", 0, |
812 | &setlist); | |
813 | ||
814 | add_cmd ("h8300", class_support, h8300_command, | |
815 | "Set machine to be H8/300.", &setmemorylist); | |
816 | ||
817 | add_cmd ("h8300h", class_support, h8300h_command, | |
818 | "Set machine to be H8/300H.", &setmemorylist); | |
819 | ||
820 | add_cmd ("h8300s", class_support, h8300s_command, | |
821 | "Set machine to be H8/300S.", &setmemorylist); | |
822 | ||
823 | /* Add a hook to set the machine type when we're loading a file. */ | |
824 | ||
c5aa993b | 825 | specify_exec_file_hook (set_machine_hook); |
c906108c SS |
826 | } |
827 | ||
828 | ||
829 | ||
830 | void | |
fba45db2 | 831 | print_register_hook (int regno) |
c906108c SS |
832 | { |
833 | if (regno == 8) | |
834 | { | |
835 | /* CCR register */ | |
836 | int C, Z, N, V; | |
837 | unsigned char b[4]; | |
838 | unsigned char l; | |
839 | read_relative_register_raw_bytes (regno, b); | |
c5aa993b | 840 | l = b[REGISTER_VIRTUAL_SIZE (8) - 1]; |
c906108c SS |
841 | printf_unfiltered ("\t"); |
842 | printf_unfiltered ("I-%d - ", (l & 0x80) != 0); | |
843 | printf_unfiltered ("H-%d - ", (l & 0x20) != 0); | |
844 | N = (l & 0x8) != 0; | |
845 | Z = (l & 0x4) != 0; | |
846 | V = (l & 0x2) != 0; | |
847 | C = (l & 0x1) != 0; | |
848 | printf_unfiltered ("N-%d ", N); | |
849 | printf_unfiltered ("Z-%d ", Z); | |
850 | printf_unfiltered ("V-%d ", V); | |
851 | printf_unfiltered ("C-%d ", C); | |
852 | if ((C | Z) == 0) | |
853 | printf_unfiltered ("u> "); | |
854 | if ((C | Z) == 1) | |
855 | printf_unfiltered ("u<= "); | |
856 | if ((C == 0)) | |
857 | printf_unfiltered ("u>= "); | |
858 | if (C == 1) | |
859 | printf_unfiltered ("u< "); | |
860 | if (Z == 0) | |
861 | printf_unfiltered ("!= "); | |
862 | if (Z == 1) | |
863 | printf_unfiltered ("== "); | |
864 | if ((N ^ V) == 0) | |
865 | printf_unfiltered (">= "); | |
866 | if ((N ^ V) == 1) | |
867 | printf_unfiltered ("< "); | |
868 | if ((Z | (N ^ V)) == 0) | |
869 | printf_unfiltered ("> "); | |
870 | if ((Z | (N ^ V)) == 1) | |
871 | printf_unfiltered ("<= "); | |
872 | } | |
873 | } | |
874 | ||
875 | void | |
fba45db2 | 876 | _initialize_h8300_tdep (void) |
c906108c SS |
877 | { |
878 | tm_print_insn = gdb_print_insn_h8300; | |
879 | } |