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c906108c | 1 | /* Target-machine dependent code for Zilog Z8000, for GDB. |
4e052eda | 2 | Copyright (C) 1992, 1993, 1994, 2001 Free Software Foundation, Inc. |
c906108c | 3 | |
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | /* | |
c5aa993b JM |
22 | Contributed by Steve Chamberlain |
23 | sac@cygnus.com | |
c906108c SS |
24 | */ |
25 | ||
26 | #include "defs.h" | |
27 | #include "frame.h" | |
28 | #include "obstack.h" | |
29 | #include "symtab.h" | |
30 | #include "gdbcmd.h" | |
31 | #include "gdbtypes.h" | |
32 | #include "dis-asm.h" | |
33 | #include "gdbcore.h" | |
4e052eda | 34 | #include "regcache.h" |
c906108c | 35 | |
d4f3574e SS |
36 | #include "value.h" /* For read_register() */ |
37 | ||
38 | ||
39 | static int read_memory_pointer (CORE_ADDR x); | |
c906108c SS |
40 | |
41 | /* Return the saved PC from this frame. | |
42 | ||
43 | If the frame has a memory copy of SRP_REGNUM, use that. If not, | |
44 | just use the register SRP_REGNUM itself. */ | |
45 | ||
46 | CORE_ADDR | |
fba45db2 | 47 | z8k_frame_saved_pc (struct frame_info *frame) |
c906108c SS |
48 | { |
49 | return read_memory_pointer (frame->frame + (BIG ? 4 : 2)); | |
50 | } | |
51 | ||
52 | #define IS_PUSHL(x) (BIG ? ((x & 0xfff0) == 0x91e0):((x & 0xfff0) == 0x91F0)) | |
53 | #define IS_PUSHW(x) (BIG ? ((x & 0xfff0) == 0x93e0):((x & 0xfff0)==0x93f0)) | |
54 | #define IS_MOVE_FP(x) (BIG ? x == 0xa1ea : x == 0xa1fa) | |
55 | #define IS_MOV_SP_FP(x) (BIG ? x == 0x94ea : x == 0x0d76) | |
56 | #define IS_SUB2_SP(x) (x==0x1b87) | |
57 | #define IS_MOVK_R5(x) (x==0x7905) | |
58 | #define IS_SUB_SP(x) ((x & 0xffff) == 0x020f) | |
59 | #define IS_PUSH_FP(x) (BIG ? (x == 0x93ea) : (x == 0x93fa)) | |
60 | ||
61 | /* work out how much local space is on the stack and | |
62 | return the pc pointing to the first push */ | |
63 | ||
64 | static CORE_ADDR | |
fba45db2 | 65 | skip_adjust (CORE_ADDR pc, int *size) |
c906108c SS |
66 | { |
67 | *size = 0; | |
68 | ||
69 | if (IS_PUSH_FP (read_memory_short (pc)) | |
70 | && IS_MOV_SP_FP (read_memory_short (pc + 2))) | |
71 | { | |
72 | /* This is a function with an explict frame pointer */ | |
73 | pc += 4; | |
74 | *size += 2; /* remember the frame pointer */ | |
75 | } | |
76 | ||
77 | /* remember any stack adjustment */ | |
78 | if (IS_SUB_SP (read_memory_short (pc))) | |
79 | { | |
80 | *size += read_memory_short (pc + 2); | |
81 | pc += 4; | |
82 | } | |
83 | return pc; | |
84 | } | |
85 | ||
a14ed312 | 86 | static CORE_ADDR examine_frame (CORE_ADDR, CORE_ADDR * regs, CORE_ADDR); |
c906108c | 87 | static CORE_ADDR |
fba45db2 | 88 | examine_frame (CORE_ADDR pc, CORE_ADDR *regs, CORE_ADDR sp) |
c906108c SS |
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 | |
c5aa993b JM |
123 | which needs stack space for locals, but has no fp. We fake up |
124 | the values as if we had an fp */ | |
c906108c SS |
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 */ | |
c5aa993b | 133 | /* regs[fp_regnum()] = fp; */ |
c906108c SS |
134 | regs[SP_REGNUM] = sp; |
135 | return pc; | |
136 | } | |
137 | ||
138 | CORE_ADDR | |
fba45db2 | 139 | z8k_skip_prologue (CORE_ADDR start_pc) |
c906108c SS |
140 | { |
141 | CORE_ADDR dummy[NUM_REGS]; | |
142 | ||
143 | return examine_frame (start_pc, dummy, 0); | |
144 | } | |
145 | ||
146 | CORE_ADDR | |
fba45db2 | 147 | z8k_addr_bits_remove (CORE_ADDR addr) |
c906108c SS |
148 | { |
149 | return (addr & PTR_MASK); | |
150 | } | |
151 | ||
d4f3574e SS |
152 | static int |
153 | read_memory_pointer (CORE_ADDR x) | |
c906108c SS |
154 | { |
155 | return read_memory_integer (ADDR_BITS_REMOVE (x), BIG ? 4 : 2); | |
156 | } | |
157 | ||
158 | CORE_ADDR | |
fba45db2 | 159 | z8k_frame_chain (struct frame_info *thisframe) |
c906108c SS |
160 | { |
161 | if (thisframe->prev == 0) | |
162 | { | |
163 | /* This is the top of the stack, let's get the sp for real */ | |
164 | } | |
165 | if (!inside_entry_file (thisframe->pc)) | |
166 | { | |
167 | return read_memory_pointer (thisframe->frame); | |
168 | } | |
169 | return 0; | |
170 | } | |
171 | ||
172 | void | |
fba45db2 | 173 | init_frame_pc (void) |
c906108c | 174 | { |
e1e9e218 | 175 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
c906108c SS |
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 | void | |
fba45db2 | 185 | z8k_frame_init_saved_regs (struct frame_info *frame_info) |
c906108c SS |
186 | { |
187 | CORE_ADDR pc; | |
188 | int w; | |
189 | ||
190 | frame_saved_regs_zalloc (frame_info); | |
191 | pc = get_pc_function_start (frame_info->pc); | |
192 | ||
193 | /* wander down the instruction stream */ | |
194 | examine_frame (pc, frame_info->saved_regs, frame_info->frame); | |
195 | ||
196 | } | |
197 | ||
198 | void | |
fba45db2 | 199 | z8k_push_dummy_frame (void) |
c906108c | 200 | { |
e1e9e218 | 201 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
c906108c SS |
202 | } |
203 | ||
204 | int | |
fba45db2 | 205 | gdb_print_insn_z8k (bfd_vma memaddr, disassemble_info *info) |
c906108c SS |
206 | { |
207 | if (BIG) | |
208 | return print_insn_z8001 (memaddr, info); | |
209 | else | |
210 | return print_insn_z8002 (memaddr, info); | |
211 | } | |
212 | ||
213 | /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or | |
214 | is not the address of a valid instruction, the address of the next | |
215 | instruction beyond ADDR otherwise. *PWORD1 receives the first word | |
c5aa993b | 216 | of the instruction. */ |
c906108c SS |
217 | |
218 | CORE_ADDR | |
fba45db2 | 219 | NEXT_PROLOGUE_INSN (CORE_ADDR addr, CORE_ADDR lim, short *pword1) |
c906108c SS |
220 | { |
221 | char buf[2]; | |
222 | if (addr < lim + 8) | |
223 | { | |
224 | read_memory (addr, buf, 2); | |
225 | *pword1 = extract_signed_integer (buf, 2); | |
226 | ||
227 | return addr + 2; | |
228 | } | |
229 | return 0; | |
230 | } | |
231 | ||
232 | #if 0 | |
233 | /* Put here the code to store, into a struct frame_saved_regs, | |
234 | the addresses of the saved registers of frame described by FRAME_INFO. | |
235 | This includes special registers such as pc and fp saved in special | |
236 | ways in the stack frame. sp is even more special: | |
237 | the address we return for it IS the sp for the next frame. | |
238 | ||
239 | We cache the result of doing this in the frame_cache_obstack, since | |
240 | it is fairly expensive. */ | |
241 | ||
242 | void | |
fba45db2 | 243 | frame_find_saved_regs (struct frame_info *fip, struct frame_saved_regs *fsrp) |
c906108c SS |
244 | { |
245 | int locals; | |
246 | CORE_ADDR pc; | |
247 | CORE_ADDR adr; | |
248 | int i; | |
249 | ||
250 | memset (fsrp, 0, sizeof *fsrp); | |
251 | ||
252 | pc = skip_adjust (get_pc_function_start (fip->pc), &locals); | |
253 | ||
254 | { | |
255 | adr = FRAME_FP (fip) - locals; | |
256 | for (i = 0; i < 8; i++) | |
257 | { | |
258 | int word = read_memory_short (pc); | |
259 | ||
260 | pc += 2; | |
261 | if (IS_PUSHL (word)) | |
262 | { | |
263 | fsrp->regs[word & 0xf] = adr; | |
264 | fsrp->regs[(word & 0xf) + 1] = adr - 2; | |
265 | adr -= 4; | |
266 | } | |
267 | else if (IS_PUSHW (word)) | |
268 | { | |
269 | fsrp->regs[word & 0xf] = adr; | |
270 | adr -= 2; | |
271 | } | |
272 | else | |
273 | break; | |
274 | } | |
275 | ||
276 | } | |
277 | ||
278 | fsrp->regs[PC_REGNUM] = fip->frame + 4; | |
279 | fsrp->regs[FP_REGNUM] = fip->frame; | |
280 | ||
281 | } | |
282 | #endif | |
283 | ||
284 | int | |
d4f3574e | 285 | z8k_saved_pc_after_call (struct frame_info *frame) |
c906108c | 286 | { |
c5aa993b | 287 | return ADDR_BITS_REMOVE |
c906108c SS |
288 | (read_memory_integer (read_register (SP_REGNUM), PTR_SIZE)); |
289 | } | |
290 | ||
291 | ||
292 | void | |
fba45db2 | 293 | extract_return_value (struct type *type, char *regbuf, char *valbuf) |
c906108c SS |
294 | { |
295 | int b; | |
296 | int len = TYPE_LENGTH (type); | |
297 | ||
298 | for (b = 0; b < len; b += 2) | |
299 | { | |
300 | int todo = len - b; | |
301 | ||
302 | if (todo > 2) | |
303 | todo = 2; | |
304 | memcpy (valbuf + b, regbuf + b, todo); | |
305 | } | |
306 | } | |
307 | ||
308 | void | |
fba45db2 | 309 | write_return_value (struct type *type, char *valbuf) |
c906108c SS |
310 | { |
311 | int reg; | |
312 | int len; | |
313 | ||
314 | for (len = 0; len < TYPE_LENGTH (type); len += 2) | |
c5aa993b | 315 | write_register_bytes (REGISTER_BYTE (len / 2 + 2), valbuf + len, 2); |
c906108c SS |
316 | } |
317 | ||
318 | void | |
fba45db2 | 319 | store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
c906108c SS |
320 | { |
321 | write_register (2, addr); | |
322 | } | |
323 | ||
324 | ||
325 | void | |
fba45db2 | 326 | z8k_print_register_hook (int regno) |
c906108c SS |
327 | { |
328 | if ((regno & 1) == 0 && regno < 16) | |
329 | { | |
330 | unsigned short l[2]; | |
331 | ||
332 | read_relative_register_raw_bytes (regno, (char *) (l + 0)); | |
333 | read_relative_register_raw_bytes (regno + 1, (char *) (l + 1)); | |
334 | printf_unfiltered ("\t"); | |
335 | printf_unfiltered ("%04x%04x", l[0], l[1]); | |
336 | } | |
337 | ||
338 | if ((regno & 3) == 0 && regno < 16) | |
339 | { | |
340 | unsigned short l[4]; | |
341 | ||
342 | read_relative_register_raw_bytes (regno, (char *) (l + 0)); | |
343 | read_relative_register_raw_bytes (regno + 1, (char *) (l + 1)); | |
344 | read_relative_register_raw_bytes (regno + 2, (char *) (l + 2)); | |
345 | read_relative_register_raw_bytes (regno + 3, (char *) (l + 3)); | |
346 | ||
347 | printf_unfiltered ("\t"); | |
348 | printf_unfiltered ("%04x%04x%04x%04x", l[0], l[1], l[2], l[3]); | |
349 | } | |
350 | if (regno == 15) | |
351 | { | |
352 | unsigned short rval; | |
353 | int i; | |
354 | ||
355 | read_relative_register_raw_bytes (regno, (char *) (&rval)); | |
356 | ||
357 | printf_unfiltered ("\n"); | |
358 | for (i = 0; i < 10; i += 2) | |
359 | { | |
d4f3574e SS |
360 | printf_unfiltered ("(sp+%d=%04x)", i, |
361 | (unsigned int)read_memory_short (rval + i)); | |
c906108c SS |
362 | } |
363 | } | |
364 | ||
365 | } | |
366 | ||
367 | void | |
fba45db2 | 368 | z8k_pop_frame (void) |
c906108c SS |
369 | { |
370 | } | |
371 | ||
372 | struct cmd_list_element *setmemorylist; | |
373 | ||
374 | void | |
fba45db2 | 375 | z8k_set_pointer_size (int newsize) |
c906108c SS |
376 | { |
377 | static int oldsize = 0; | |
378 | ||
379 | if (oldsize != newsize) | |
380 | { | |
381 | printf_unfiltered ("pointer size set to %d bits\n", newsize); | |
382 | oldsize = newsize; | |
383 | if (newsize == 32) | |
384 | { | |
385 | BIG = 1; | |
386 | } | |
387 | else | |
388 | { | |
389 | BIG = 0; | |
390 | } | |
d4f3574e SS |
391 | /* FIXME: This code should be using the GDBARCH framework to |
392 | handle changed type sizes. If this problem is ever fixed | |
393 | (the direct reference to _initialize_gdbtypes() below | |
394 | eliminated) then Makefile.in should be updated so that | |
395 | z8k-tdep.c is again compiled with -Werror. */ | |
c906108c SS |
396 | _initialize_gdbtypes (); |
397 | } | |
398 | } | |
399 | ||
400 | static void | |
fba45db2 | 401 | segmented_command (char *args, int from_tty) |
c906108c SS |
402 | { |
403 | z8k_set_pointer_size (32); | |
404 | } | |
405 | ||
406 | static void | |
fba45db2 | 407 | unsegmented_command (char *args, int from_tty) |
c906108c SS |
408 | { |
409 | z8k_set_pointer_size (16); | |
410 | } | |
411 | ||
412 | static void | |
fba45db2 | 413 | set_memory (char *args, int from_tty) |
c906108c SS |
414 | { |
415 | printf_unfiltered ("\"set memory\" must be followed by the name of a memory subcommand.\n"); | |
416 | help_list (setmemorylist, "set memory ", -1, gdb_stdout); | |
417 | } | |
418 | ||
419 | void | |
fba45db2 | 420 | _initialize_z8ktdep (void) |
c906108c SS |
421 | { |
422 | tm_print_insn = gdb_print_insn_z8k; | |
423 | ||
424 | add_prefix_cmd ("memory", no_class, set_memory, | |
425 | "set the memory model", &setmemorylist, "set memory ", 0, | |
426 | &setlist); | |
427 | add_cmd ("segmented", class_support, segmented_command, | |
428 | "Set segmented memory model.", &setmemorylist); | |
429 | add_cmd ("unsegmented", class_support, unsegmented_command, | |
430 | "Set unsegmented memory model.", &setmemorylist); | |
431 | ||
432 | } |