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c906108c SS |
1 | /* Target-machine dependent code for Zilog Z8000, for GDB. |
2 | Copyright (C) 1992, 1993, 1994 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 | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | /* | |
21 | Contributed by Steve Chamberlain | |
22 | sac@cygnus.com | |
23 | */ | |
24 | ||
25 | #include "defs.h" | |
26 | #include "frame.h" | |
27 | #include "obstack.h" | |
28 | #include "symtab.h" | |
29 | #include "gdbcmd.h" | |
30 | #include "gdbtypes.h" | |
31 | #include "dis-asm.h" | |
32 | #include "gdbcore.h" | |
33 | ||
34 | ||
35 | /* Return the saved PC from this frame. | |
36 | ||
37 | If the frame has a memory copy of SRP_REGNUM, use that. If not, | |
38 | just use the register SRP_REGNUM itself. */ | |
39 | ||
40 | CORE_ADDR | |
41 | frame_saved_pc (frame) | |
42 | struct frame_info *frame; | |
43 | { | |
44 | return read_memory_pointer (frame->frame + (BIG ? 4 : 2)); | |
45 | } | |
46 | ||
47 | #define IS_PUSHL(x) (BIG ? ((x & 0xfff0) == 0x91e0):((x & 0xfff0) == 0x91F0)) | |
48 | #define IS_PUSHW(x) (BIG ? ((x & 0xfff0) == 0x93e0):((x & 0xfff0)==0x93f0)) | |
49 | #define IS_MOVE_FP(x) (BIG ? x == 0xa1ea : x == 0xa1fa) | |
50 | #define IS_MOV_SP_FP(x) (BIG ? x == 0x94ea : x == 0x0d76) | |
51 | #define IS_SUB2_SP(x) (x==0x1b87) | |
52 | #define IS_MOVK_R5(x) (x==0x7905) | |
53 | #define IS_SUB_SP(x) ((x & 0xffff) == 0x020f) | |
54 | #define IS_PUSH_FP(x) (BIG ? (x == 0x93ea) : (x == 0x93fa)) | |
55 | ||
56 | /* work out how much local space is on the stack and | |
57 | return the pc pointing to the first push */ | |
58 | ||
59 | static CORE_ADDR | |
60 | skip_adjust (pc, size) | |
61 | CORE_ADDR pc; | |
62 | int *size; | |
63 | { | |
64 | *size = 0; | |
65 | ||
66 | if (IS_PUSH_FP (read_memory_short (pc)) | |
67 | && IS_MOV_SP_FP (read_memory_short (pc + 2))) | |
68 | { | |
69 | /* This is a function with an explict frame pointer */ | |
70 | pc += 4; | |
71 | *size += 2; /* remember the frame pointer */ | |
72 | } | |
73 | ||
74 | /* remember any stack adjustment */ | |
75 | if (IS_SUB_SP (read_memory_short (pc))) | |
76 | { | |
77 | *size += read_memory_short (pc + 2); | |
78 | pc += 4; | |
79 | } | |
80 | return pc; | |
81 | } | |
82 | ||
83 | static CORE_ADDR examine_frame PARAMS ((CORE_ADDR, CORE_ADDR *regs, CORE_ADDR)); | |
84 | static CORE_ADDR | |
85 | examine_frame (pc, regs, sp) | |
86 | CORE_ADDR pc; | |
87 | CORE_ADDR *regs; | |
88 | CORE_ADDR sp; | |
89 | { | |
90 | int w = read_memory_short (pc); | |
91 | int offset = 0; | |
92 | int regno; | |
93 | ||
94 | for (regno = 0; regno < NUM_REGS; regno++) | |
95 | regs[regno] = 0; | |
96 | ||
97 | while (IS_PUSHW (w) || IS_PUSHL (w)) | |
98 | { | |
99 | /* work out which register is being pushed to where */ | |
100 | if (IS_PUSHL (w)) | |
101 | { | |
102 | regs[w & 0xf] = offset; | |
103 | regs[(w & 0xf) + 1] = offset + 2; | |
104 | offset += 4; | |
105 | } | |
106 | else | |
107 | { | |
108 | regs[w & 0xf] = offset; | |
109 | offset += 2; | |
110 | } | |
111 | pc += 2; | |
112 | w = read_memory_short (pc); | |
113 | } | |
114 | ||
115 | if (IS_MOVE_FP (w)) | |
116 | { | |
117 | /* We know the fp */ | |
118 | ||
119 | } | |
120 | else if (IS_SUB_SP (w)) | |
121 | { | |
122 | /* Subtracting a value from the sp, so were in a function | |
123 | which needs stack space for locals, but has no fp. We fake up | |
124 | the values as if we had an fp */ | |
125 | regs[FP_REGNUM] = sp; | |
126 | } | |
127 | else | |
128 | { | |
129 | /* This one didn't have an fp, we'll fake it up */ | |
130 | regs[SP_REGNUM] = sp; | |
131 | } | |
132 | /* stack pointer contains address of next frame */ | |
133 | /* regs[fp_regnum()] = fp;*/ | |
134 | regs[SP_REGNUM] = sp; | |
135 | return pc; | |
136 | } | |
137 | ||
138 | CORE_ADDR | |
139 | z8k_skip_prologue (start_pc) | |
140 | CORE_ADDR start_pc; | |
141 | { | |
142 | CORE_ADDR dummy[NUM_REGS]; | |
143 | ||
144 | return examine_frame (start_pc, dummy, 0); | |
145 | } | |
146 | ||
147 | CORE_ADDR | |
148 | z8k_addr_bits_remove (addr) | |
149 | CORE_ADDR addr; | |
150 | { | |
151 | return (addr & PTR_MASK); | |
152 | } | |
153 | ||
154 | int | |
155 | read_memory_pointer (x) | |
156 | CORE_ADDR x; | |
157 | { | |
158 | return read_memory_integer (ADDR_BITS_REMOVE (x), BIG ? 4 : 2); | |
159 | } | |
160 | ||
161 | CORE_ADDR | |
162 | frame_chain (thisframe) | |
163 | struct frame_info *thisframe; | |
164 | { | |
165 | if (thisframe->prev == 0) | |
166 | { | |
167 | /* This is the top of the stack, let's get the sp for real */ | |
168 | } | |
169 | if (!inside_entry_file (thisframe->pc)) | |
170 | { | |
171 | return read_memory_pointer (thisframe->frame); | |
172 | } | |
173 | return 0; | |
174 | } | |
175 | ||
176 | void | |
177 | init_frame_pc () | |
178 | { | |
179 | abort (); | |
180 | } | |
181 | ||
182 | /* Put here the code to store, into a struct frame_saved_regs, | |
183 | the addresses of the saved registers of frame described by FRAME_INFO. | |
184 | This includes special registers such as pc and fp saved in special | |
185 | ways in the stack frame. sp is even more special: | |
186 | the address we return for it IS the sp for the next frame. */ | |
187 | ||
188 | void | |
189 | z8k_frame_init_saved_regs (frame_info) | |
190 | struct frame_info *frame_info; | |
191 | { | |
192 | CORE_ADDR pc; | |
193 | int w; | |
194 | ||
195 | frame_saved_regs_zalloc (frame_info); | |
196 | pc = get_pc_function_start (frame_info->pc); | |
197 | ||
198 | /* wander down the instruction stream */ | |
199 | examine_frame (pc, frame_info->saved_regs, frame_info->frame); | |
200 | ||
201 | } | |
202 | ||
203 | void | |
204 | z8k_push_dummy_frame () | |
205 | { | |
206 | abort (); | |
207 | } | |
208 | ||
209 | int | |
210 | gdb_print_insn_z8k (memaddr, info) | |
211 | bfd_vma memaddr; | |
212 | disassemble_info *info; | |
213 | { | |
214 | if (BIG) | |
215 | return print_insn_z8001 (memaddr, info); | |
216 | else | |
217 | return print_insn_z8002 (memaddr, info); | |
218 | } | |
219 | ||
220 | /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or | |
221 | is not the address of a valid instruction, the address of the next | |
222 | instruction beyond ADDR otherwise. *PWORD1 receives the first word | |
223 | of the instruction.*/ | |
224 | ||
225 | CORE_ADDR | |
226 | NEXT_PROLOGUE_INSN (addr, lim, pword1) | |
227 | CORE_ADDR addr; | |
228 | CORE_ADDR lim; | |
229 | short *pword1; | |
230 | { | |
231 | char buf[2]; | |
232 | if (addr < lim + 8) | |
233 | { | |
234 | read_memory (addr, buf, 2); | |
235 | *pword1 = extract_signed_integer (buf, 2); | |
236 | ||
237 | return addr + 2; | |
238 | } | |
239 | return 0; | |
240 | } | |
241 | ||
242 | #if 0 | |
243 | /* Put here the code to store, into a struct frame_saved_regs, | |
244 | the addresses of the saved registers of frame described by FRAME_INFO. | |
245 | This includes special registers such as pc and fp saved in special | |
246 | ways in the stack frame. sp is even more special: | |
247 | the address we return for it IS the sp for the next frame. | |
248 | ||
249 | We cache the result of doing this in the frame_cache_obstack, since | |
250 | it is fairly expensive. */ | |
251 | ||
252 | void | |
253 | frame_find_saved_regs (fip, fsrp) | |
254 | struct frame_info *fip; | |
255 | struct frame_saved_regs *fsrp; | |
256 | { | |
257 | int locals; | |
258 | CORE_ADDR pc; | |
259 | CORE_ADDR adr; | |
260 | int i; | |
261 | ||
262 | memset (fsrp, 0, sizeof *fsrp); | |
263 | ||
264 | pc = skip_adjust (get_pc_function_start (fip->pc), &locals); | |
265 | ||
266 | { | |
267 | adr = FRAME_FP (fip) - locals; | |
268 | for (i = 0; i < 8; i++) | |
269 | { | |
270 | int word = read_memory_short (pc); | |
271 | ||
272 | pc += 2; | |
273 | if (IS_PUSHL (word)) | |
274 | { | |
275 | fsrp->regs[word & 0xf] = adr; | |
276 | fsrp->regs[(word & 0xf) + 1] = adr - 2; | |
277 | adr -= 4; | |
278 | } | |
279 | else if (IS_PUSHW (word)) | |
280 | { | |
281 | fsrp->regs[word & 0xf] = adr; | |
282 | adr -= 2; | |
283 | } | |
284 | else | |
285 | break; | |
286 | } | |
287 | ||
288 | } | |
289 | ||
290 | fsrp->regs[PC_REGNUM] = fip->frame + 4; | |
291 | fsrp->regs[FP_REGNUM] = fip->frame; | |
292 | ||
293 | } | |
294 | #endif | |
295 | ||
296 | int | |
297 | saved_pc_after_call () | |
298 | { | |
299 | return ADDR_BITS_REMOVE | |
300 | (read_memory_integer (read_register (SP_REGNUM), PTR_SIZE)); | |
301 | } | |
302 | ||
303 | ||
304 | void | |
305 | extract_return_value (type, regbuf, valbuf) | |
306 | struct type *type; | |
307 | char *regbuf; | |
308 | char *valbuf; | |
309 | { | |
310 | int b; | |
311 | int len = TYPE_LENGTH (type); | |
312 | ||
313 | for (b = 0; b < len; b += 2) | |
314 | { | |
315 | int todo = len - b; | |
316 | ||
317 | if (todo > 2) | |
318 | todo = 2; | |
319 | memcpy (valbuf + b, regbuf + b, todo); | |
320 | } | |
321 | } | |
322 | ||
323 | void | |
324 | write_return_value (type, valbuf) | |
325 | struct type *type; | |
326 | char *valbuf; | |
327 | { | |
328 | int reg; | |
329 | int len; | |
330 | ||
331 | for (len = 0; len < TYPE_LENGTH (type); len += 2) | |
332 | write_register_bytes (REGISTER_BYTE (len / 2 + 2), valbuf + len, 2); | |
333 | } | |
334 | ||
335 | void | |
336 | store_struct_return (addr, sp) | |
337 | CORE_ADDR addr; | |
338 | CORE_ADDR sp; | |
339 | { | |
340 | write_register (2, addr); | |
341 | } | |
342 | ||
343 | ||
344 | void | |
345 | print_register_hook (regno) | |
346 | int regno; | |
347 | { | |
348 | if ((regno & 1) == 0 && regno < 16) | |
349 | { | |
350 | unsigned short l[2]; | |
351 | ||
352 | read_relative_register_raw_bytes (regno, (char *) (l + 0)); | |
353 | read_relative_register_raw_bytes (regno + 1, (char *) (l + 1)); | |
354 | printf_unfiltered ("\t"); | |
355 | printf_unfiltered ("%04x%04x", l[0], l[1]); | |
356 | } | |
357 | ||
358 | if ((regno & 3) == 0 && regno < 16) | |
359 | { | |
360 | unsigned short l[4]; | |
361 | ||
362 | read_relative_register_raw_bytes (regno, (char *) (l + 0)); | |
363 | read_relative_register_raw_bytes (regno + 1, (char *) (l + 1)); | |
364 | read_relative_register_raw_bytes (regno + 2, (char *) (l + 2)); | |
365 | read_relative_register_raw_bytes (regno + 3, (char *) (l + 3)); | |
366 | ||
367 | printf_unfiltered ("\t"); | |
368 | printf_unfiltered ("%04x%04x%04x%04x", l[0], l[1], l[2], l[3]); | |
369 | } | |
370 | if (regno == 15) | |
371 | { | |
372 | unsigned short rval; | |
373 | int i; | |
374 | ||
375 | read_relative_register_raw_bytes (regno, (char *) (&rval)); | |
376 | ||
377 | printf_unfiltered ("\n"); | |
378 | for (i = 0; i < 10; i += 2) | |
379 | { | |
380 | printf_unfiltered ("(sp+%d=%04x)", i, read_memory_short (rval + i)); | |
381 | } | |
382 | } | |
383 | ||
384 | } | |
385 | ||
386 | void | |
387 | z8k_pop_frame () | |
388 | { | |
389 | } | |
390 | ||
391 | struct cmd_list_element *setmemorylist; | |
392 | ||
393 | void | |
394 | z8k_set_pointer_size (newsize) | |
395 | int newsize; | |
396 | { | |
397 | static int oldsize = 0; | |
398 | ||
399 | if (oldsize != newsize) | |
400 | { | |
401 | printf_unfiltered ("pointer size set to %d bits\n", newsize); | |
402 | oldsize = newsize; | |
403 | if (newsize == 32) | |
404 | { | |
405 | BIG = 1; | |
406 | } | |
407 | else | |
408 | { | |
409 | BIG = 0; | |
410 | } | |
411 | _initialize_gdbtypes (); | |
412 | } | |
413 | } | |
414 | ||
415 | static void | |
416 | segmented_command (args, from_tty) | |
417 | char *args; | |
418 | int from_tty; | |
419 | { | |
420 | z8k_set_pointer_size (32); | |
421 | } | |
422 | ||
423 | static void | |
424 | unsegmented_command (args, from_tty) | |
425 | char *args; | |
426 | int from_tty; | |
427 | { | |
428 | z8k_set_pointer_size (16); | |
429 | } | |
430 | ||
431 | static void | |
432 | set_memory (args, from_tty) | |
433 | char *args; | |
434 | int from_tty; | |
435 | { | |
436 | printf_unfiltered ("\"set memory\" must be followed by the name of a memory subcommand.\n"); | |
437 | help_list (setmemorylist, "set memory ", -1, gdb_stdout); | |
438 | } | |
439 | ||
440 | void | |
441 | _initialize_z8ktdep () | |
442 | { | |
443 | tm_print_insn = gdb_print_insn_z8k; | |
444 | ||
445 | add_prefix_cmd ("memory", no_class, set_memory, | |
446 | "set the memory model", &setmemorylist, "set memory ", 0, | |
447 | &setlist); | |
448 | add_cmd ("segmented", class_support, segmented_command, | |
449 | "Set segmented memory model.", &setmemorylist); | |
450 | add_cmd ("unsegmented", class_support, unsegmented_command, | |
451 | "Set unsegmented memory model.", &setmemorylist); | |
452 | ||
453 | } |