Commit | Line | Data |
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1f46923f SC |
1 | /* Target-machine dependent code for Hitachi H8/300, for GDB. |
2 | Copyright (C) 1988, 1990, 1991 Free Software Foundation, Inc. | |
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. */ |
1f46923f | 19 | |
ec25d19b | 20 | /* |
1f46923f | 21 | Contributed by Steve Chamberlain |
ec25d19b | 22 | sac@cygnus.com |
1f46923f SC |
23 | */ |
24 | ||
400943fb | 25 | #include "defs.h" |
1f46923f SC |
26 | #include "frame.h" |
27 | #include "obstack.h" | |
28 | #include "symtab.h" | |
7f4c8595 | 29 | #include "dis-asm.h" |
a3059251 SC |
30 | #include "gdbcmd.h" |
31 | #include "gdbtypes.h" | |
f9fedc48 MA |
32 | #include "gdbcore.h" |
33 | #include "gdb_string.h" | |
34 | #include "value.h" | |
35 | ||
dc1b349d | 36 | extern int h8300hmode, h8300smode; |
a3059251 | 37 | |
256b4f37 SC |
38 | #undef NUM_REGS |
39 | #define NUM_REGS 11 | |
40 | ||
1f46923f | 41 | #define UNSIGNED_SHORT(X) ((X) & 0xffff) |
400943fb | 42 | |
31778db0 | 43 | #define IS_PUSH(x) ((x & 0xfff0)==0x6df0) |
ec25d19b | 44 | #define IS_PUSH_FP(x) (x == 0x6df6) |
31778db0 JL |
45 | #define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6) |
46 | #define IS_MOV_SP_FP(x) (x == 0x0d76 || x == 0x0ff6) | |
1f46923f | 47 | #define IS_SUB2_SP(x) (x==0x1b87) |
31778db0 JL |
48 | #define IS_SUB4_SP(x) (x==0x1b97) |
49 | #define IS_SUBL_SP(x) (x==0x7a37) | |
1f46923f | 50 | #define IS_MOVK_R5(x) (x==0x7905) |
ec25d19b | 51 | #define IS_SUB_R5SP(x) (x==0x1957) |
1ca9e7c9 | 52 | |
f9fedc48 MA |
53 | /* Local function declarations. */ |
54 | ||
1ca9e7c9 | 55 | static CORE_ADDR examine_prologue (); |
f9fedc48 | 56 | static void set_machine_hook PARAMS ((char *filename)); |
1f46923f | 57 | |
dc1b349d MS |
58 | void h8300_frame_find_saved_regs (); |
59 | ||
ec25d19b SC |
60 | CORE_ADDR |
61 | h8300_skip_prologue (start_pc) | |
62 | CORE_ADDR start_pc; | |
0a8f9d31 | 63 | { |
ec25d19b | 64 | short int w; |
31778db0 | 65 | int adjust = 0; |
1f46923f | 66 | |
4679717d JL |
67 | /* Skip past all push and stm insns. */ |
68 | while (1) | |
31778db0 | 69 | { |
4679717d JL |
70 | w = read_memory_unsigned_integer (start_pc, 2); |
71 | /* First look for push insns. */ | |
72 | if (w == 0x0100 || w == 0x0110 || w == 0x0120 || w == 0x0130) | |
73 | { | |
74 | w = read_memory_unsigned_integer (start_pc + 2, 2); | |
75 | adjust = 2; | |
76 | } | |
77 | ||
78 | if (IS_PUSH (w)) | |
79 | { | |
80 | start_pc += 2 + adjust; | |
81 | w = read_memory_unsigned_integer (start_pc, 2); | |
82 | continue; | |
83 | } | |
84 | adjust = 0; | |
85 | break; | |
31778db0 JL |
86 | } |
87 | ||
4679717d JL |
88 | /* Skip past a move to FP, either word or long sized */ |
89 | w = read_memory_unsigned_integer (start_pc, 2); | |
90 | if (w == 0x0100) | |
ec25d19b | 91 | { |
4679717d JL |
92 | w = read_memory_unsigned_integer (start_pc + 2, 2); |
93 | adjust += 2; | |
ec25d19b | 94 | } |
0a8f9d31 | 95 | |
ec25d19b SC |
96 | if (IS_MOVE_FP (w)) |
97 | { | |
4679717d | 98 | start_pc += 2 + adjust; |
df14b38b | 99 | w = read_memory_unsigned_integer (start_pc, 2); |
1f46923f SC |
100 | } |
101 | ||
4679717d JL |
102 | /* Check for loading either a word constant into r5; |
103 | long versions are handled by the SUBL_SP below. */ | |
ec25d19b SC |
104 | if (IS_MOVK_R5 (w)) |
105 | { | |
106 | start_pc += 2; | |
df14b38b | 107 | w = read_memory_unsigned_integer (start_pc, 2); |
ec25d19b | 108 | } |
4679717d JL |
109 | |
110 | /* Now check for subtracting r5 from sp, word sized only. */ | |
ec25d19b SC |
111 | if (IS_SUB_R5SP (w)) |
112 | { | |
4679717d | 113 | start_pc += 2 + adjust; |
df14b38b | 114 | w = read_memory_unsigned_integer (start_pc, 2); |
ec25d19b | 115 | } |
4679717d JL |
116 | |
117 | /* Check for subs #2 and subs #4. */ | |
31778db0 | 118 | while (IS_SUB2_SP (w) || IS_SUB4_SP (w)) |
ec25d19b | 119 | { |
4679717d | 120 | start_pc += 2 + adjust; |
df14b38b | 121 | w = read_memory_unsigned_integer (start_pc, 2); |
ec25d19b SC |
122 | } |
123 | ||
4679717d | 124 | /* Check for a 32bit subtract. */ |
31778db0 | 125 | if (IS_SUBL_SP (w)) |
4679717d | 126 | start_pc += 6 + adjust; |
31778db0 | 127 | |
ec25d19b | 128 | return start_pc; |
ec25d19b | 129 | } |
1f46923f | 130 | |
400943fb | 131 | int |
18b46e7c SS |
132 | gdb_print_insn_h8300 (memaddr, info) |
133 | bfd_vma memaddr; | |
134 | disassemble_info *info; | |
0a8f9d31 | 135 | { |
d15396df JL |
136 | if (h8300smode) |
137 | return print_insn_h8300s (memaddr, info); | |
239889fd | 138 | else if (h8300hmode) |
5076ecd0 | 139 | return print_insn_h8300h (memaddr, info); |
d0414a11 | 140 | else |
5076ecd0 | 141 | return print_insn_h8300 (memaddr, info); |
0a8f9d31 | 142 | } |
ec25d19b | 143 | |
1f46923f SC |
144 | /* Given a GDB frame, determine the address of the calling function's frame. |
145 | This will be used to create a new GDB frame struct, and then | |
146 | INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. | |
147 | ||
148 | For us, the frame address is its stack pointer value, so we look up | |
149 | the function prologue to determine the caller's sp value, and return it. */ | |
150 | ||
669caa9c SS |
151 | CORE_ADDR |
152 | h8300_frame_chain (thisframe) | |
153 | struct frame_info *thisframe; | |
1f46923f | 154 | { |
dc1b349d MS |
155 | if (PC_IN_CALL_DUMMY(thisframe->pc, thisframe->frame, thisframe->frame)) |
156 | { /* initialize the from_pc now */ | |
157 | thisframe->from_pc = generic_read_register_dummy (thisframe->pc, | |
158 | thisframe->frame, | |
159 | PC_REGNUM); | |
160 | return thisframe->frame; | |
161 | } | |
162 | h8300_frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0); | |
ec25d19b | 163 | return thisframe->fsr->regs[SP_REGNUM]; |
1f46923f SC |
164 | } |
165 | ||
1f46923f SC |
166 | /* Put here the code to store, into a struct frame_saved_regs, |
167 | the addresses of the saved registers of frame described by FRAME_INFO. | |
168 | This includes special registers such as pc and fp saved in special | |
169 | ways in the stack frame. sp is even more special: | |
170 | the address we return for it IS the sp for the next frame. | |
171 | ||
86a51f41 AC |
172 | We cache the result of doing this in the frame_obstack, since it is |
173 | fairly expensive. */ | |
1f46923f SC |
174 | |
175 | void | |
dc1b349d | 176 | h8300_frame_find_saved_regs (fi, fsr) |
1f46923f SC |
177 | struct frame_info *fi; |
178 | struct frame_saved_regs *fsr; | |
179 | { | |
1f46923f | 180 | register struct frame_saved_regs *cache_fsr; |
1f46923f SC |
181 | CORE_ADDR ip; |
182 | struct symtab_and_line sal; | |
183 | CORE_ADDR limit; | |
184 | ||
185 | if (!fi->fsr) | |
186 | { | |
187 | cache_fsr = (struct frame_saved_regs *) | |
86a51f41 | 188 | frame_obstack_alloc (sizeof (struct frame_saved_regs)); |
4ed97c9a | 189 | memset (cache_fsr, '\0', sizeof (struct frame_saved_regs)); |
ec25d19b | 190 | |
1f46923f SC |
191 | fi->fsr = cache_fsr; |
192 | ||
dc1b349d MS |
193 | if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame)) |
194 | { /* no more to do. */ | |
195 | if (fsr) | |
196 | *fsr = *fi->fsr; | |
197 | return; | |
198 | } | |
1f46923f SC |
199 | /* Find the start and end of the function prologue. If the PC |
200 | is in the function prologue, we only consider the part that | |
201 | has executed already. */ | |
ec25d19b | 202 | |
1f46923f SC |
203 | ip = get_pc_function_start (fi->pc); |
204 | sal = find_pc_line (ip, 0); | |
ec25d19b | 205 | limit = (sal.end && sal.end < fi->pc) ? sal.end : fi->pc; |
1f46923f SC |
206 | |
207 | /* This will fill in fields in *fi as well as in cache_fsr. */ | |
208 | examine_prologue (ip, limit, fi->frame, cache_fsr, fi); | |
209 | } | |
210 | ||
211 | if (fsr) | |
212 | *fsr = *fi->fsr; | |
213 | } | |
1f46923f SC |
214 | |
215 | /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or | |
216 | is not the address of a valid instruction, the address of the next | |
217 | instruction beyond ADDR otherwise. *PWORD1 receives the first word | |
218 | of the instruction.*/ | |
219 | ||
1f46923f | 220 | CORE_ADDR |
ec25d19b SC |
221 | NEXT_PROLOGUE_INSN (addr, lim, pword1) |
222 | CORE_ADDR addr; | |
223 | CORE_ADDR lim; | |
58e49e21 | 224 | INSN_WORD *pword1; |
1f46923f | 225 | { |
34df79fc | 226 | char buf[2]; |
ec25d19b SC |
227 | if (addr < lim + 8) |
228 | { | |
34df79fc JK |
229 | read_memory (addr, buf, 2); |
230 | *pword1 = extract_signed_integer (buf, 2); | |
1f46923f | 231 | |
ec25d19b SC |
232 | return addr + 2; |
233 | } | |
1f46923f | 234 | return 0; |
1f46923f SC |
235 | } |
236 | ||
237 | /* Examine the prologue of a function. `ip' points to the first instruction. | |
ec25d19b | 238 | `limit' is the limit of the prologue (e.g. the addr of the first |
1f46923f | 239 | linenumber, or perhaps the program counter if we're stepping through). |
ec25d19b | 240 | `frame_sp' is the stack pointer value in use in this frame. |
1f46923f | 241 | `fsr' is a pointer to a frame_saved_regs structure into which we put |
ec25d19b | 242 | info about the registers saved by this frame. |
1f46923f SC |
243 | `fi' is a struct frame_info pointer; we fill in various fields in it |
244 | to reflect the offsets of the arg pointer and the locals pointer. */ | |
245 | ||
1f46923f SC |
246 | static CORE_ADDR |
247 | examine_prologue (ip, limit, after_prolog_fp, fsr, fi) | |
248 | register CORE_ADDR ip; | |
249 | register CORE_ADDR limit; | |
669caa9c | 250 | CORE_ADDR after_prolog_fp; |
1f46923f SC |
251 | struct frame_saved_regs *fsr; |
252 | struct frame_info *fi; | |
253 | { | |
254 | register CORE_ADDR next_ip; | |
255 | int r; | |
1f46923f | 256 | int have_fp = 0; |
1f46923f | 257 | INSN_WORD insn_word; |
d0414a11 DE |
258 | /* Number of things pushed onto stack, starts at 2/4, 'cause the |
259 | PC is already there */ | |
a3059251 | 260 | unsigned int reg_save_depth = h8300hmode ? 4 : 2; |
1f46923f SC |
261 | |
262 | unsigned int auto_depth = 0; /* Number of bytes of autos */ | |
1f46923f | 263 | |
ddf30c37 | 264 | char in_frame[11]; /* One for each reg */ |
1f46923f | 265 | |
31778db0 JL |
266 | int adjust = 0; |
267 | ||
ddf30c37 | 268 | memset (in_frame, 1, 11); |
256b4f37 | 269 | for (r = 0; r < 8; r++) |
ec25d19b SC |
270 | { |
271 | fsr->regs[r] = 0; | |
272 | } | |
273 | if (after_prolog_fp == 0) | |
274 | { | |
275 | after_prolog_fp = read_register (SP_REGNUM); | |
276 | } | |
4679717d JL |
277 | |
278 | /* If the PC isn't valid, quit now. */ | |
31778db0 | 279 | if (ip == 0 || ip & (h8300hmode ? ~0xffffff : ~0xffff)) |
ec25d19b | 280 | return 0; |
1f46923f | 281 | |
ec25d19b | 282 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); |
1f46923f | 283 | |
31778db0 JL |
284 | if (insn_word == 0x0100) |
285 | { | |
286 | insn_word = read_memory_unsigned_integer (ip + 2, 2); | |
287 | adjust = 2; | |
288 | } | |
289 | ||
ec25d19b SC |
290 | /* Skip over any fp push instructions */ |
291 | fsr->regs[6] = after_prolog_fp; | |
292 | while (next_ip && IS_PUSH_FP (insn_word)) | |
293 | { | |
31778db0 | 294 | ip = next_ip + adjust; |
1f46923f | 295 | |
ec25d19b SC |
296 | in_frame[insn_word & 0x7] = reg_save_depth; |
297 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
31778db0 | 298 | reg_save_depth += 2 + adjust; |
ec25d19b | 299 | } |
1f46923f SC |
300 | |
301 | /* Is this a move into the fp */ | |
ec25d19b SC |
302 | if (next_ip && IS_MOV_SP_FP (insn_word)) |
303 | { | |
304 | ip = next_ip; | |
305 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
306 | have_fp = 1; | |
307 | } | |
1f46923f SC |
308 | |
309 | /* Skip over any stack adjustment, happens either with a number of | |
310 | sub#2,sp or a mov #x,r5 sub r5,sp */ | |
311 | ||
31778db0 | 312 | if (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word))) |
1f46923f | 313 | { |
31778db0 | 314 | while (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word))) |
ec25d19b | 315 | { |
31778db0 | 316 | auto_depth += IS_SUB2_SP (insn_word) ? 2 : 4; |
ec25d19b SC |
317 | ip = next_ip; |
318 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
319 | } | |
1f46923f | 320 | } |
ec25d19b SC |
321 | else |
322 | { | |
323 | if (next_ip && IS_MOVK_R5 (insn_word)) | |
324 | { | |
325 | ip = next_ip; | |
326 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
327 | auto_depth += insn_word; | |
328 | ||
329 | next_ip = NEXT_PROLOGUE_INSN (next_ip, limit, &insn_word); | |
330 | auto_depth += insn_word; | |
ec25d19b | 331 | } |
31778db0 JL |
332 | if (next_ip && IS_SUBL_SP (insn_word)) |
333 | { | |
334 | ip = next_ip; | |
335 | auto_depth += read_memory_unsigned_integer (ip, 4); | |
336 | ip += 4; | |
337 | ||
338 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
339 | } | |
ec25d19b | 340 | } |
31778db0 | 341 | |
4679717d JL |
342 | /* Now examine the push insns to determine where everything lives |
343 | on the stack. */ | |
344 | while (1) | |
1f46923f | 345 | { |
4679717d JL |
346 | adjust = 0; |
347 | if (!next_ip) | |
348 | break; | |
349 | ||
350 | if (insn_word == 0x0100) | |
351 | { | |
352 | ip = next_ip; | |
353 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
354 | adjust = 2; | |
355 | } | |
356 | ||
357 | if (IS_PUSH (insn_word)) | |
358 | { | |
359 | ip = next_ip; | |
360 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
361 | fsr->regs[r] = after_prolog_fp + auto_depth; | |
362 | auto_depth += 2 + adjust; | |
363 | continue; | |
364 | } | |
365 | ||
366 | /* Now check for push multiple insns. */ | |
367 | if (insn_word == 0x0110 || insn_word == 0x0120 || insn_word == 0x0130) | |
368 | { | |
369 | int count = ((insn_word >> 4) & 0xf) + 1; | |
370 | int start, i; | |
371 | ||
372 | ip = next_ip; | |
373 | next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); | |
374 | start = insn_word & 0x7; | |
375 | ||
376 | for (i = start; i <= start + count; i++) | |
377 | { | |
378 | fsr->regs[i] = after_prolog_fp + auto_depth; | |
379 | auto_depth += 4; | |
380 | } | |
381 | } | |
382 | break; | |
1f46923f | 383 | } |
1f46923f | 384 | |
1f46923f | 385 | /* The args are always reffed based from the stack pointer */ |
ec25d19b | 386 | fi->args_pointer = after_prolog_fp; |
1f46923f | 387 | /* Locals are always reffed based from the fp */ |
ec25d19b | 388 | fi->locals_pointer = after_prolog_fp; |
1f46923f | 389 | /* The PC is at a known place */ |
31778db0 | 390 | fi->from_pc = read_memory_unsigned_integer (after_prolog_fp + BINWORD, BINWORD); |
1f46923f SC |
391 | |
392 | /* Rememeber any others too */ | |
1f46923f | 393 | in_frame[PC_REGNUM] = 0; |
dc1b349d | 394 | |
ec25d19b SC |
395 | if (have_fp) |
396 | /* We keep the old FP in the SP spot */ | |
b1d0b161 | 397 | fsr->regs[SP_REGNUM] = read_memory_unsigned_integer (fsr->regs[6], BINWORD); |
ec25d19b SC |
398 | else |
399 | fsr->regs[SP_REGNUM] = after_prolog_fp + auto_depth; | |
400 | ||
1f46923f SC |
401 | return (ip); |
402 | } | |
403 | ||
404 | void | |
dc1b349d | 405 | h8300_init_extra_frame_info (fromleaf, fi) |
1f46923f SC |
406 | int fromleaf; |
407 | struct frame_info *fi; | |
408 | { | |
409 | fi->fsr = 0; /* Not yet allocated */ | |
410 | fi->args_pointer = 0; /* Unknown */ | |
411 | fi->locals_pointer = 0; /* Unknown */ | |
412 | fi->from_pc = 0; | |
dc1b349d MS |
413 | if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame)) |
414 | { /* anything special to do? */ | |
415 | return; | |
416 | } | |
1f46923f | 417 | } |
ec25d19b | 418 | |
1f46923f SC |
419 | /* Return the saved PC from this frame. |
420 | ||
421 | If the frame has a memory copy of SRP_REGNUM, use that. If not, | |
422 | just use the register SRP_REGNUM itself. */ | |
423 | ||
424 | CORE_ADDR | |
dc1b349d | 425 | h8300_frame_saved_pc (frame) |
669caa9c | 426 | struct frame_info *frame; |
1f46923f | 427 | { |
dc1b349d MS |
428 | if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame)) |
429 | return generic_read_register_dummy (frame->pc, frame->frame, PC_REGNUM); | |
430 | else | |
431 | return frame->from_pc; | |
1f46923f SC |
432 | } |
433 | ||
1f46923f SC |
434 | CORE_ADDR |
435 | frame_locals_address (fi) | |
436 | struct frame_info *fi; | |
437 | { | |
dc1b349d MS |
438 | if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame)) |
439 | return (CORE_ADDR) 0; /* Not sure what else to do... */ | |
ec25d19b SC |
440 | if (!fi->locals_pointer) |
441 | { | |
442 | struct frame_saved_regs ignore; | |
443 | ||
444 | get_frame_saved_regs (fi, &ignore); | |
1f46923f | 445 | |
ec25d19b | 446 | } |
1f46923f SC |
447 | return fi->locals_pointer; |
448 | } | |
449 | ||
450 | /* Return the address of the argument block for the frame | |
451 | described by FI. Returns 0 if the address is unknown. */ | |
452 | ||
453 | CORE_ADDR | |
454 | frame_args_address (fi) | |
455 | struct frame_info *fi; | |
456 | { | |
dc1b349d MS |
457 | if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame)) |
458 | return (CORE_ADDR) 0; /* Not sure what else to do... */ | |
ec25d19b SC |
459 | if (!fi->args_pointer) |
460 | { | |
461 | struct frame_saved_regs ignore; | |
462 | ||
463 | get_frame_saved_regs (fi, &ignore); | |
464 | ||
465 | } | |
1f46923f | 466 | |
1f46923f SC |
467 | return fi->args_pointer; |
468 | } | |
469 | ||
dc1b349d MS |
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). | |
500 | ||
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 | |
508 | h8300_push_arguments(nargs, args, sp, struct_return, struct_addr) | |
509 | int nargs; | |
510 | struct value **args; | |
511 | CORE_ADDR sp; | |
512 | unsigned char struct_return; | |
513 | CORE_ADDR struct_addr; | |
514 | { | |
515 | int stack_align, stack_alloc, stack_offset; | |
516 | int wordsize; | |
517 | int argreg; | |
518 | int argnum; | |
519 | struct type *type; | |
520 | CORE_ADDR regval; | |
521 | char *val; | |
522 | char valbuf[4]; | |
523 | int len; | |
524 | ||
525 | if (h8300hmode || h8300smode) | |
526 | { | |
527 | stack_align = 3; | |
528 | wordsize = 4; | |
529 | } | |
530 | else | |
531 | { | |
532 | stack_align = 1; | |
533 | wordsize = 2; | |
534 | } | |
535 | ||
536 | /* first force sp to a n-byte alignment */ | |
537 | sp = sp & ~stack_align; | |
538 | ||
539 | /* Now make sure there's space on the stack */ | |
540 | for (argnum = 0, stack_alloc = 0; | |
541 | argnum < nargs; argnum++) | |
542 | stack_alloc += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + stack_align) | |
543 | & ~stack_align); | |
544 | sp -= stack_alloc; /* make room on stack for args */ | |
545 | /* we may over-allocate a little here, but that won't hurt anything */ | |
546 | ||
547 | argreg = ARG0_REGNUM; | |
548 | if (struct_return) /* "struct return" pointer takes up one argreg */ | |
549 | { | |
550 | write_register (argreg++, struct_addr); | |
551 | } | |
552 | ||
553 | /* Now load as many as possible of the first arguments into | |
554 | registers, and push the rest onto the stack. There are 3N bytes | |
555 | in three registers available. Loop thru args from first to last. */ | |
556 | ||
557 | for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) | |
558 | { | |
559 | type = VALUE_TYPE (args[argnum]); | |
560 | len = TYPE_LENGTH (type); | |
561 | memset(valbuf, 0, sizeof(valbuf)); | |
562 | if (len < wordsize) | |
563 | { | |
564 | /* the purpose of this is to right-justify the value within the word */ | |
565 | memcpy(valbuf + (wordsize - len), | |
566 | (char *) VALUE_CONTENTS (args[argnum]), len); | |
567 | val = valbuf; | |
568 | } | |
569 | else | |
570 | val = (char *) VALUE_CONTENTS (args[argnum]); | |
571 | ||
572 | if (len > (ARGLAST_REGNUM+1 - argreg) * REGISTER_RAW_SIZE(ARG0_REGNUM) || | |
573 | (len > wordsize && (len & stack_align) != 0)) | |
574 | { /* passed on the stack */ | |
575 | write_memory (sp + stack_offset, val, | |
576 | len < wordsize ? wordsize : len); | |
577 | stack_offset += (len + stack_align) & ~stack_align; | |
578 | } | |
579 | /* NOTE WELL!!!!! This is not an "else if" clause!!! | |
580 | That's because some *&^%$ things get passed on the stack | |
581 | AND in the registers! */ | |
582 | if (len <= (ARGLAST_REGNUM+1 - argreg) * REGISTER_RAW_SIZE(ARG0_REGNUM)) | |
583 | while (len > 0) | |
584 | { /* there's room in registers */ | |
585 | regval = extract_address (val, wordsize); | |
586 | write_register (argreg, regval); | |
587 | len -= wordsize; | |
588 | val += wordsize; | |
589 | argreg++; | |
590 | } | |
591 | } | |
592 | return sp; | |
593 | } | |
594 | ||
595 | /* Function: push_return_address | |
596 | Setup the return address for a dummy frame, as called by | |
597 | call_function_by_hand. Only necessary when you are using an | |
598 | empty CALL_DUMMY, ie. the target will not actually be executing | |
599 | a JSR/BSR instruction. */ | |
600 | ||
601 | CORE_ADDR | |
602 | h8300_push_return_address (pc, sp) | |
603 | CORE_ADDR pc; | |
604 | CORE_ADDR sp; | |
605 | { | |
606 | unsigned char buf[4]; | |
607 | int wordsize; | |
608 | ||
609 | if (h8300hmode || h8300smode) | |
610 | wordsize = 4; | |
611 | else | |
612 | wordsize = 2; | |
613 | ||
dc1b349d | 614 | sp -= wordsize; |
409f64ae | 615 | store_unsigned_integer (buf, wordsize, CALL_DUMMY_ADDRESS ()); |
dc1b349d MS |
616 | write_memory (sp, buf, wordsize); |
617 | return sp; | |
618 | } | |
619 | ||
620 | /* Function: pop_frame | |
621 | Restore the machine to the state it had before the current frame | |
622 | was created. Usually used either by the "RETURN" command, or by | |
623 | call_function_by_hand after the dummy_frame is finished. */ | |
624 | ||
ec25d19b SC |
625 | void |
626 | h8300_pop_frame () | |
1f46923f SC |
627 | { |
628 | unsigned regnum; | |
629 | struct frame_saved_regs fsr; | |
669caa9c | 630 | struct frame_info *frame = get_current_frame (); |
1f46923f | 631 | |
dc1b349d | 632 | if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame)) |
1f46923f | 633 | { |
dc1b349d | 634 | generic_pop_dummy_frame(); |
1f46923f | 635 | } |
dc1b349d MS |
636 | else |
637 | { | |
638 | get_frame_saved_regs (frame, &fsr); | |
6bafbdfb | 639 | |
dc1b349d MS |
640 | for (regnum = 0; regnum < 8; regnum++) |
641 | { | |
642 | /* Don't forget SP_REGNUM is a frame_saved_regs struct is the | |
643 | actual value we want, not the address of the value we want. */ | |
644 | if (fsr.regs[regnum] && regnum != SP_REGNUM) | |
645 | write_register (regnum, | |
646 | read_memory_integer(fsr.regs[regnum], BINWORD)); | |
647 | else if (fsr.regs[regnum] && regnum == SP_REGNUM) | |
648 | write_register (regnum, frame->frame + 2 * BINWORD); | |
649 | } | |
650 | ||
651 | /* Don't forget the update the PC too! */ | |
652 | write_pc (frame->from_pc); | |
653 | } | |
6bafbdfb | 654 | flush_cached_frames (); |
1f46923f | 655 | } |
ec25d19b | 656 | |
dc1b349d MS |
657 | /* Function: extract_return_value |
658 | Figure out where in REGBUF the called function has left its return value. | |
659 | Copy that into VALBUF. Be sure to account for CPU type. */ | |
660 | ||
661 | void | |
662 | h8300_extract_return_value (type, regbuf, valbuf) | |
663 | struct type *type; | |
664 | char *regbuf; | |
665 | char *valbuf; | |
666 | { | |
667 | int wordsize, len; | |
668 | ||
669 | if (h8300smode || h8300hmode) | |
670 | wordsize = 4; | |
671 | else | |
672 | wordsize = 2; | |
673 | ||
674 | len = TYPE_LENGTH(type); | |
675 | ||
676 | switch (len) { | |
677 | case 1: /* (char) */ | |
678 | case 2: /* (short), (int) */ | |
679 | memcpy (valbuf, regbuf + REGISTER_BYTE(0) + (wordsize - len), len); | |
680 | break; | |
681 | case 4: /* (long), (float) */ | |
682 | if (h8300smode || h8300hmode) | |
683 | { | |
684 | memcpy (valbuf, regbuf + REGISTER_BYTE(0), 4); | |
685 | } | |
686 | else | |
687 | { | |
688 | memcpy (valbuf, regbuf + REGISTER_BYTE(0), 2); | |
689 | memcpy (valbuf+2, regbuf + REGISTER_BYTE(1), 2); | |
690 | } | |
691 | break; | |
692 | case 8: /* (double) (doesn't seem to happen, which is good, | |
693 | because this almost certainly isn't right. */ | |
694 | error ("I don't know how a double is returned."); | |
695 | break; | |
696 | } | |
697 | } | |
698 | ||
699 | /* Function: store_return_value | |
700 | Place the appropriate value in the appropriate registers. | |
701 | Primarily used by the RETURN command. */ | |
702 | ||
703 | void | |
704 | h8300_store_return_value (type, valbuf) | |
705 | struct type *type; | |
706 | char *valbuf; | |
707 | { | |
708 | int wordsize, len, regval; | |
709 | ||
710 | if (h8300hmode || h8300smode) | |
711 | wordsize = 4; | |
712 | else | |
713 | wordsize = 2; | |
714 | ||
715 | len = TYPE_LENGTH(type); | |
716 | switch (len) { | |
717 | case 1: /* char */ | |
718 | case 2: /* short, int */ | |
719 | regval = extract_address(valbuf, len); | |
720 | write_register (0, regval); | |
721 | break; | |
722 | case 4: /* long, float */ | |
723 | regval = extract_address(valbuf, len); | |
724 | if (h8300smode || h8300hmode) | |
725 | { | |
726 | write_register (0, regval); | |
727 | } | |
728 | else | |
729 | { | |
730 | write_register (0, regval >> 16); | |
731 | write_register (1, regval & 0xffff); | |
732 | } | |
733 | break; | |
734 | case 8: /* presumeably double, but doesn't seem to happen */ | |
735 | error ("I don't know how to return a double."); | |
736 | break; | |
737 | } | |
738 | } | |
739 | ||
740 | /* Function: get_saved_register | |
741 | Just call the generic_get_saved_register function. */ | |
742 | ||
743 | void | |
744 | get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) | |
745 | char *raw_buffer; | |
746 | int *optimized; | |
747 | CORE_ADDR *addrp; | |
748 | struct frame_info *frame; | |
749 | int regnum; | |
750 | enum lval_type *lval; | |
751 | { | |
752 | generic_get_saved_register (raw_buffer, optimized, addrp, | |
753 | frame, regnum, lval); | |
754 | } | |
a3059251 SC |
755 | |
756 | struct cmd_list_element *setmemorylist; | |
757 | ||
758 | static void | |
759 | h8300_command(args, from_tty) | |
760 | { | |
761 | extern int h8300hmode; | |
762 | h8300hmode = 0; | |
d15396df | 763 | h8300smode = 0; |
a3059251 SC |
764 | } |
765 | ||
766 | static void | |
767 | h8300h_command(args, from_tty) | |
768 | { | |
769 | extern int h8300hmode; | |
770 | h8300hmode = 1; | |
d15396df | 771 | h8300smode = 0; |
d15396df | 772 | } |
d15396df JL |
773 | static void |
774 | h8300s_command(args, from_tty) | |
775 | { | |
776 | extern int h8300smode; | |
777 | extern int h8300hmode; | |
778 | h8300smode = 1; | |
779 | h8300hmode = 1; | |
a3059251 | 780 | } |
d15396df | 781 | |
a3059251 SC |
782 | |
783 | static void | |
784 | set_machine (args, from_tty) | |
785 | char *args; | |
786 | int from_tty; | |
787 | { | |
d15396df | 788 | printf_unfiltered ("\"set machine\" must be followed by h8300, h8300h"); |
d15396df | 789 | printf_unfiltered ("or h8300s"); |
199b2450 | 790 | help_list (setmemorylist, "set memory ", -1, gdb_stdout); |
a3059251 SC |
791 | } |
792 | ||
f9fedc48 MA |
793 | /* set_machine_hook is called as the exec file is being opened, but |
794 | before the symbol file is opened. This allows us to set the | |
795 | h8300hmode flag based on the machine type specified in the exec | |
796 | file. This in turn will cause subsequently defined pointer types | |
797 | to be 16 or 32 bits as appropriate for the machine. */ | |
798 | ||
799 | static void | |
800 | set_machine_hook (filename) | |
801 | char *filename; | |
802 | { | |
d15396df JL |
803 | if (bfd_get_mach (exec_bfd) == bfd_mach_h8300s) |
804 | { | |
805 | h8300smode = 1; | |
806 | h8300hmode = 1; | |
807 | } | |
808 | else | |
d15396df JL |
809 | if (bfd_get_mach (exec_bfd) == bfd_mach_h8300h) |
810 | { | |
d15396df | 811 | h8300smode = 0; |
d15396df JL |
812 | h8300hmode = 1; |
813 | } | |
814 | else | |
815 | { | |
d15396df | 816 | h8300smode = 0; |
d15396df JL |
817 | h8300hmode = 0; |
818 | } | |
f9fedc48 MA |
819 | } |
820 | ||
a3059251 SC |
821 | void |
822 | _initialize_h8300m () | |
823 | { | |
824 | add_prefix_cmd ("machine", no_class, set_machine, | |
dc1b349d MS |
825 | "set the machine type", |
826 | &setmemorylist, "set machine ", 0, | |
a3059251 SC |
827 | &setlist); |
828 | ||
829 | add_cmd ("h8300", class_support, h8300_command, | |
830 | "Set machine to be H8/300.", &setmemorylist); | |
831 | ||
832 | add_cmd ("h8300h", class_support, h8300h_command, | |
833 | "Set machine to be H8/300H.", &setmemorylist); | |
f9fedc48 | 834 | |
d15396df JL |
835 | add_cmd ("h8300s", class_support, h8300s_command, |
836 | "Set machine to be H8/300S.", &setmemorylist); | |
d15396df | 837 | |
f9fedc48 MA |
838 | /* Add a hook to set the machine type when we're loading a file. */ |
839 | ||
840 | specify_exec_file_hook(set_machine_hook); | |
a3059251 SC |
841 | } |
842 | ||
843 | ||
844 | ||
ec25d19b SC |
845 | void |
846 | print_register_hook (regno) | |
847 | { | |
848 | if (regno == 8) | |
849 | { | |
850 | /* CCR register */ | |
ec25d19b | 851 | int C, Z, N, V; |
08c0d7b8 | 852 | unsigned char b[4]; |
ec25d19b | 853 | unsigned char l; |
ec25d19b | 854 | read_relative_register_raw_bytes (regno, b); |
08c0d7b8 | 855 | l = b[REGISTER_VIRTUAL_SIZE(8) -1]; |
199b2450 TL |
856 | printf_unfiltered ("\t"); |
857 | printf_unfiltered ("I-%d - ", (l & 0x80) != 0); | |
858 | printf_unfiltered ("H-%d - ", (l & 0x20) != 0); | |
ec25d19b SC |
859 | N = (l & 0x8) != 0; |
860 | Z = (l & 0x4) != 0; | |
861 | V = (l & 0x2) != 0; | |
862 | C = (l & 0x1) != 0; | |
199b2450 TL |
863 | printf_unfiltered ("N-%d ", N); |
864 | printf_unfiltered ("Z-%d ", Z); | |
865 | printf_unfiltered ("V-%d ", V); | |
866 | printf_unfiltered ("C-%d ", C); | |
ec25d19b | 867 | if ((C | Z) == 0) |
199b2450 | 868 | printf_unfiltered ("u> "); |
ec25d19b | 869 | if ((C | Z) == 1) |
199b2450 | 870 | printf_unfiltered ("u<= "); |
ec25d19b | 871 | if ((C == 0)) |
199b2450 | 872 | printf_unfiltered ("u>= "); |
ec25d19b | 873 | if (C == 1) |
199b2450 | 874 | printf_unfiltered ("u< "); |
ec25d19b | 875 | if (Z == 0) |
199b2450 | 876 | printf_unfiltered ("!= "); |
ec25d19b | 877 | if (Z == 1) |
199b2450 | 878 | printf_unfiltered ("== "); |
ec25d19b | 879 | if ((N ^ V) == 0) |
199b2450 | 880 | printf_unfiltered (">= "); |
ec25d19b | 881 | if ((N ^ V) == 1) |
199b2450 | 882 | printf_unfiltered ("< "); |
ec25d19b | 883 | if ((Z | (N ^ V)) == 0) |
199b2450 | 884 | printf_unfiltered ("> "); |
ec25d19b | 885 | if ((Z | (N ^ V)) == 1) |
199b2450 | 886 | printf_unfiltered ("<= "); |
ec25d19b SC |
887 | } |
888 | } | |
a3059251 | 889 | |
18b46e7c SS |
890 | void |
891 | _initialize_h8300_tdep () | |
892 | { | |
893 | tm_print_insn = gdb_print_insn_h8300; | |
894 | } |