Commit | Line | Data |
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c906108c | 1 | /* Target-machine dependent code for Zilog Z8000, for GDB. |
b6ba6518 KB |
2 | Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001 |
3 | 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 "gdbcmd.h" | |
32 | #include "gdbtypes.h" | |
33 | #include "dis-asm.h" | |
34 | #include "gdbcore.h" | |
4e052eda | 35 | #include "regcache.h" |
c906108c | 36 | |
d4f3574e SS |
37 | #include "value.h" /* For read_register() */ |
38 | ||
39 | ||
40 | static int read_memory_pointer (CORE_ADDR x); | |
c906108c SS |
41 | |
42 | /* Return the saved PC from this frame. | |
43 | ||
44 | If the frame has a memory copy of SRP_REGNUM, use that. If not, | |
45 | just use the register SRP_REGNUM itself. */ | |
46 | ||
47 | CORE_ADDR | |
fba45db2 | 48 | z8k_frame_saved_pc (struct frame_info *frame) |
c906108c SS |
49 | { |
50 | return read_memory_pointer (frame->frame + (BIG ? 4 : 2)); | |
51 | } | |
52 | ||
53 | #define IS_PUSHL(x) (BIG ? ((x & 0xfff0) == 0x91e0):((x & 0xfff0) == 0x91F0)) | |
54 | #define IS_PUSHW(x) (BIG ? ((x & 0xfff0) == 0x93e0):((x & 0xfff0)==0x93f0)) | |
55 | #define IS_MOVE_FP(x) (BIG ? x == 0xa1ea : x == 0xa1fa) | |
56 | #define IS_MOV_SP_FP(x) (BIG ? x == 0x94ea : x == 0x0d76) | |
57 | #define IS_SUB2_SP(x) (x==0x1b87) | |
58 | #define IS_MOVK_R5(x) (x==0x7905) | |
59 | #define IS_SUB_SP(x) ((x & 0xffff) == 0x020f) | |
60 | #define IS_PUSH_FP(x) (BIG ? (x == 0x93ea) : (x == 0x93fa)) | |
61 | ||
62 | /* work out how much local space is on the stack and | |
63 | return the pc pointing to the first push */ | |
64 | ||
65 | static CORE_ADDR | |
fba45db2 | 66 | skip_adjust (CORE_ADDR pc, int *size) |
c906108c SS |
67 | { |
68 | *size = 0; | |
69 | ||
70 | if (IS_PUSH_FP (read_memory_short (pc)) | |
71 | && IS_MOV_SP_FP (read_memory_short (pc + 2))) | |
72 | { | |
73 | /* This is a function with an explict frame pointer */ | |
74 | pc += 4; | |
75 | *size += 2; /* remember the frame pointer */ | |
76 | } | |
77 | ||
78 | /* remember any stack adjustment */ | |
79 | if (IS_SUB_SP (read_memory_short (pc))) | |
80 | { | |
81 | *size += read_memory_short (pc + 2); | |
82 | pc += 4; | |
83 | } | |
84 | return pc; | |
85 | } | |
86 | ||
a14ed312 | 87 | static CORE_ADDR examine_frame (CORE_ADDR, CORE_ADDR * regs, CORE_ADDR); |
c906108c | 88 | static CORE_ADDR |
fba45db2 | 89 | examine_frame (CORE_ADDR pc, CORE_ADDR *regs, CORE_ADDR sp) |
c906108c SS |
90 | { |
91 | int w = read_memory_short (pc); | |
92 | int offset = 0; | |
93 | int regno; | |
94 | ||
95 | for (regno = 0; regno < NUM_REGS; regno++) | |
96 | regs[regno] = 0; | |
97 | ||
98 | while (IS_PUSHW (w) || IS_PUSHL (w)) | |
99 | { | |
100 | /* work out which register is being pushed to where */ | |
101 | if (IS_PUSHL (w)) | |
102 | { | |
103 | regs[w & 0xf] = offset; | |
104 | regs[(w & 0xf) + 1] = offset + 2; | |
105 | offset += 4; | |
106 | } | |
107 | else | |
108 | { | |
109 | regs[w & 0xf] = offset; | |
110 | offset += 2; | |
111 | } | |
112 | pc += 2; | |
113 | w = read_memory_short (pc); | |
114 | } | |
115 | ||
116 | if (IS_MOVE_FP (w)) | |
117 | { | |
118 | /* We know the fp */ | |
119 | ||
120 | } | |
121 | else if (IS_SUB_SP (w)) | |
122 | { | |
123 | /* Subtracting a value from the sp, so were in a function | |
c5aa993b JM |
124 | which needs stack space for locals, but has no fp. We fake up |
125 | the values as if we had an fp */ | |
c906108c SS |
126 | regs[FP_REGNUM] = sp; |
127 | } | |
128 | else | |
129 | { | |
130 | /* This one didn't have an fp, we'll fake it up */ | |
131 | regs[SP_REGNUM] = sp; | |
132 | } | |
133 | /* stack pointer contains address of next frame */ | |
c5aa993b | 134 | /* regs[fp_regnum()] = fp; */ |
c906108c SS |
135 | regs[SP_REGNUM] = sp; |
136 | return pc; | |
137 | } | |
138 | ||
139 | CORE_ADDR | |
fba45db2 | 140 | z8k_skip_prologue (CORE_ADDR start_pc) |
c906108c SS |
141 | { |
142 | CORE_ADDR dummy[NUM_REGS]; | |
143 | ||
144 | return examine_frame (start_pc, dummy, 0); | |
145 | } | |
146 | ||
147 | CORE_ADDR | |
fba45db2 | 148 | z8k_addr_bits_remove (CORE_ADDR addr) |
c906108c SS |
149 | { |
150 | return (addr & PTR_MASK); | |
151 | } | |
152 | ||
d4f3574e SS |
153 | static int |
154 | read_memory_pointer (CORE_ADDR x) | |
c906108c SS |
155 | { |
156 | return read_memory_integer (ADDR_BITS_REMOVE (x), BIG ? 4 : 2); | |
157 | } | |
158 | ||
159 | CORE_ADDR | |
fba45db2 | 160 | z8k_frame_chain (struct frame_info *thisframe) |
c906108c SS |
161 | { |
162 | if (thisframe->prev == 0) | |
163 | { | |
164 | /* This is the top of the stack, let's get the sp for real */ | |
165 | } | |
166 | if (!inside_entry_file (thisframe->pc)) | |
167 | { | |
168 | return read_memory_pointer (thisframe->frame); | |
169 | } | |
170 | return 0; | |
171 | } | |
172 | ||
173 | void | |
fba45db2 | 174 | init_frame_pc (void) |
c906108c | 175 | { |
e1e9e218 | 176 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
c906108c SS |
177 | } |
178 | ||
179 | /* Put here the code to store, into a struct frame_saved_regs, | |
180 | the addresses of the saved registers of frame described by FRAME_INFO. | |
181 | This includes special registers such as pc and fp saved in special | |
182 | ways in the stack frame. sp is even more special: | |
183 | the address we return for it IS the sp for the next frame. */ | |
184 | ||
185 | void | |
fba45db2 | 186 | z8k_frame_init_saved_regs (struct frame_info *frame_info) |
c906108c SS |
187 | { |
188 | CORE_ADDR pc; | |
189 | int w; | |
190 | ||
191 | frame_saved_regs_zalloc (frame_info); | |
192 | pc = get_pc_function_start (frame_info->pc); | |
193 | ||
194 | /* wander down the instruction stream */ | |
195 | examine_frame (pc, frame_info->saved_regs, frame_info->frame); | |
196 | ||
197 | } | |
198 | ||
199 | void | |
fba45db2 | 200 | z8k_push_dummy_frame (void) |
c906108c | 201 | { |
e1e9e218 | 202 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
c906108c SS |
203 | } |
204 | ||
205 | int | |
fba45db2 | 206 | gdb_print_insn_z8k (bfd_vma memaddr, disassemble_info *info) |
c906108c SS |
207 | { |
208 | if (BIG) | |
209 | return print_insn_z8001 (memaddr, info); | |
210 | else | |
211 | return print_insn_z8002 (memaddr, info); | |
212 | } | |
213 | ||
214 | /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or | |
215 | is not the address of a valid instruction, the address of the next | |
216 | instruction beyond ADDR otherwise. *PWORD1 receives the first word | |
c5aa993b | 217 | of the instruction. */ |
c906108c SS |
218 | |
219 | CORE_ADDR | |
fba45db2 | 220 | NEXT_PROLOGUE_INSN (CORE_ADDR addr, CORE_ADDR lim, short *pword1) |
c906108c SS |
221 | { |
222 | char buf[2]; | |
223 | if (addr < lim + 8) | |
224 | { | |
225 | read_memory (addr, buf, 2); | |
226 | *pword1 = extract_signed_integer (buf, 2); | |
227 | ||
228 | return addr + 2; | |
229 | } | |
230 | return 0; | |
231 | } | |
232 | ||
233 | #if 0 | |
234 | /* Put here the code to store, into a struct frame_saved_regs, | |
235 | the addresses of the saved registers of frame described by FRAME_INFO. | |
236 | This includes special registers such as pc and fp saved in special | |
237 | ways in the stack frame. sp is even more special: | |
238 | the address we return for it IS the sp for the next frame. | |
239 | ||
240 | We cache the result of doing this in the frame_cache_obstack, since | |
241 | it is fairly expensive. */ | |
242 | ||
243 | void | |
fba45db2 | 244 | frame_find_saved_regs (struct frame_info *fip, struct frame_saved_regs *fsrp) |
c906108c SS |
245 | { |
246 | int locals; | |
247 | CORE_ADDR pc; | |
248 | CORE_ADDR adr; | |
249 | int i; | |
250 | ||
251 | memset (fsrp, 0, sizeof *fsrp); | |
252 | ||
253 | pc = skip_adjust (get_pc_function_start (fip->pc), &locals); | |
254 | ||
255 | { | |
256 | adr = FRAME_FP (fip) - locals; | |
257 | for (i = 0; i < 8; i++) | |
258 | { | |
259 | int word = read_memory_short (pc); | |
260 | ||
261 | pc += 2; | |
262 | if (IS_PUSHL (word)) | |
263 | { | |
264 | fsrp->regs[word & 0xf] = adr; | |
265 | fsrp->regs[(word & 0xf) + 1] = adr - 2; | |
266 | adr -= 4; | |
267 | } | |
268 | else if (IS_PUSHW (word)) | |
269 | { | |
270 | fsrp->regs[word & 0xf] = adr; | |
271 | adr -= 2; | |
272 | } | |
273 | else | |
274 | break; | |
275 | } | |
276 | ||
277 | } | |
278 | ||
279 | fsrp->regs[PC_REGNUM] = fip->frame + 4; | |
280 | fsrp->regs[FP_REGNUM] = fip->frame; | |
281 | ||
282 | } | |
283 | #endif | |
284 | ||
285 | int | |
d4f3574e | 286 | z8k_saved_pc_after_call (struct frame_info *frame) |
c906108c | 287 | { |
c5aa993b | 288 | return ADDR_BITS_REMOVE |
c906108c SS |
289 | (read_memory_integer (read_register (SP_REGNUM), PTR_SIZE)); |
290 | } | |
291 | ||
292 | ||
293 | void | |
fba45db2 | 294 | extract_return_value (struct type *type, char *regbuf, char *valbuf) |
c906108c SS |
295 | { |
296 | int b; | |
297 | int len = TYPE_LENGTH (type); | |
298 | ||
299 | for (b = 0; b < len; b += 2) | |
300 | { | |
301 | int todo = len - b; | |
302 | ||
303 | if (todo > 2) | |
304 | todo = 2; | |
305 | memcpy (valbuf + b, regbuf + b, todo); | |
306 | } | |
307 | } | |
308 | ||
309 | void | |
fba45db2 | 310 | write_return_value (struct type *type, char *valbuf) |
c906108c SS |
311 | { |
312 | int reg; | |
313 | int len; | |
314 | ||
315 | for (len = 0; len < TYPE_LENGTH (type); len += 2) | |
c5aa993b | 316 | write_register_bytes (REGISTER_BYTE (len / 2 + 2), valbuf + len, 2); |
c906108c SS |
317 | } |
318 | ||
319 | void | |
fba45db2 | 320 | store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
c906108c SS |
321 | { |
322 | write_register (2, addr); | |
323 | } | |
324 | ||
325 | ||
326 | void | |
fba45db2 | 327 | z8k_print_register_hook (int regno) |
c906108c SS |
328 | { |
329 | if ((regno & 1) == 0 && regno < 16) | |
330 | { | |
331 | unsigned short l[2]; | |
332 | ||
333 | read_relative_register_raw_bytes (regno, (char *) (l + 0)); | |
334 | read_relative_register_raw_bytes (regno + 1, (char *) (l + 1)); | |
335 | printf_unfiltered ("\t"); | |
336 | printf_unfiltered ("%04x%04x", l[0], l[1]); | |
337 | } | |
338 | ||
339 | if ((regno & 3) == 0 && regno < 16) | |
340 | { | |
341 | unsigned short l[4]; | |
342 | ||
343 | read_relative_register_raw_bytes (regno, (char *) (l + 0)); | |
344 | read_relative_register_raw_bytes (regno + 1, (char *) (l + 1)); | |
345 | read_relative_register_raw_bytes (regno + 2, (char *) (l + 2)); | |
346 | read_relative_register_raw_bytes (regno + 3, (char *) (l + 3)); | |
347 | ||
348 | printf_unfiltered ("\t"); | |
349 | printf_unfiltered ("%04x%04x%04x%04x", l[0], l[1], l[2], l[3]); | |
350 | } | |
351 | if (regno == 15) | |
352 | { | |
353 | unsigned short rval; | |
354 | int i; | |
355 | ||
356 | read_relative_register_raw_bytes (regno, (char *) (&rval)); | |
357 | ||
358 | printf_unfiltered ("\n"); | |
359 | for (i = 0; i < 10; i += 2) | |
360 | { | |
d4f3574e SS |
361 | printf_unfiltered ("(sp+%d=%04x)", i, |
362 | (unsigned int)read_memory_short (rval + i)); | |
c906108c SS |
363 | } |
364 | } | |
365 | ||
366 | } | |
367 | ||
368 | void | |
fba45db2 | 369 | z8k_pop_frame (void) |
c906108c SS |
370 | { |
371 | } | |
372 | ||
373 | struct cmd_list_element *setmemorylist; | |
374 | ||
375 | void | |
fba45db2 | 376 | z8k_set_pointer_size (int newsize) |
c906108c SS |
377 | { |
378 | static int oldsize = 0; | |
379 | ||
380 | if (oldsize != newsize) | |
381 | { | |
382 | printf_unfiltered ("pointer size set to %d bits\n", newsize); | |
383 | oldsize = newsize; | |
384 | if (newsize == 32) | |
385 | { | |
386 | BIG = 1; | |
387 | } | |
388 | else | |
389 | { | |
390 | BIG = 0; | |
391 | } | |
d4f3574e SS |
392 | /* FIXME: This code should be using the GDBARCH framework to |
393 | handle changed type sizes. If this problem is ever fixed | |
394 | (the direct reference to _initialize_gdbtypes() below | |
395 | eliminated) then Makefile.in should be updated so that | |
396 | z8k-tdep.c is again compiled with -Werror. */ | |
c906108c SS |
397 | _initialize_gdbtypes (); |
398 | } | |
399 | } | |
400 | ||
401 | static void | |
fba45db2 | 402 | segmented_command (char *args, int from_tty) |
c906108c SS |
403 | { |
404 | z8k_set_pointer_size (32); | |
405 | } | |
406 | ||
407 | static void | |
fba45db2 | 408 | unsegmented_command (char *args, int from_tty) |
c906108c SS |
409 | { |
410 | z8k_set_pointer_size (16); | |
411 | } | |
412 | ||
413 | static void | |
fba45db2 | 414 | set_memory (char *args, int from_tty) |
c906108c SS |
415 | { |
416 | printf_unfiltered ("\"set memory\" must be followed by the name of a memory subcommand.\n"); | |
417 | help_list (setmemorylist, "set memory ", -1, gdb_stdout); | |
418 | } | |
419 | ||
420 | void | |
fba45db2 | 421 | _initialize_z8ktdep (void) |
c906108c SS |
422 | { |
423 | tm_print_insn = gdb_print_insn_z8k; | |
424 | ||
425 | add_prefix_cmd ("memory", no_class, set_memory, | |
426 | "set the memory model", &setmemorylist, "set memory ", 0, | |
427 | &setlist); | |
428 | add_cmd ("segmented", class_support, segmented_command, | |
429 | "Set segmented memory model.", &setmemorylist); | |
430 | add_cmd ("unsegmented", class_support, unsegmented_command, | |
431 | "Set unsegmented memory model.", &setmemorylist); | |
432 | ||
433 | } |