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c906108c | 1 | /* Print VAX instructions for GDB, the GNU debugger. |
464e0365 AC |
2 | |
3 | Copyright 1986, 1989, 1991, 1992, 1995, 1996, 1998, 1999, 2000, | |
4 | 2002, 2003, 2004 Free Software Foundation, Inc. | |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "symtab.h" | |
25 | #include "opcode/vax.h" | |
c11c3a98 | 26 | #include "gdbcore.h" |
f267bd6a | 27 | #include "inferior.h" |
a33f7558 | 28 | #include "regcache.h" |
c11c3a98 | 29 | #include "frame.h" |
7def7fef MK |
30 | #include "frame-base.h" |
31 | #include "frame-unwind.h" | |
32 | #include "trad-frame.h" | |
c11c3a98 | 33 | #include "value.h" |
f267bd6a | 34 | #include "arch-utils.h" |
9bbe19fb | 35 | #include "gdb_string.h" |
4be87837 | 36 | #include "osabi.h" |
a89aa300 | 37 | #include "dis-asm.h" |
f267bd6a JT |
38 | |
39 | #include "vax-tdep.h" | |
40 | ||
5e6b39ff MK |
41 | /* Return the name of register REGNUM. */ |
42 | ||
fa88f677 | 43 | static const char * |
5e6b39ff | 44 | vax_register_name (int regnum) |
51eb8b08 JT |
45 | { |
46 | static char *register_names[] = | |
47 | { | |
5e6b39ff MK |
48 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
49 | "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", | |
51eb8b08 JT |
50 | "ps", |
51 | }; | |
52 | ||
5e6b39ff MK |
53 | if (regnum >= 0 && regnum < ARRAY_SIZE (register_names)) |
54 | return register_names[regnum]; | |
51eb8b08 | 55 | |
5e6b39ff | 56 | return NULL; |
51eb8b08 JT |
57 | } |
58 | ||
5e6b39ff MK |
59 | /* Return the GDB type object for the "standard" data type of data in |
60 | register REGNUM. */ | |
51eb8b08 | 61 | |
f267bd6a | 62 | static struct type * |
5e6b39ff | 63 | vax_register_type (struct gdbarch *gdbarch, int regnum) |
51eb8b08 | 64 | { |
5e6b39ff | 65 | return builtin_type_int; |
51eb8b08 JT |
66 | } |
67 | \f | |
52efde73 | 68 | |
f267bd6a | 69 | static void |
52efde73 JT |
70 | vax_push_dummy_frame (void) |
71 | { | |
72 | CORE_ADDR sp = read_register (SP_REGNUM); | |
73 | int regnum; | |
74 | ||
75 | sp = push_word (sp, 0); /* arglist */ | |
76 | for (regnum = 11; regnum >= 0; regnum--) | |
77 | sp = push_word (sp, read_register (regnum)); | |
78 | sp = push_word (sp, read_register (PC_REGNUM)); | |
7def7fef | 79 | sp = push_word (sp, read_register (VAX_FP_REGNUM)); |
1d049c5e | 80 | sp = push_word (sp, read_register (VAX_AP_REGNUM)); |
52efde73 JT |
81 | sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef) + 0x2fff0000); |
82 | sp = push_word (sp, 0); | |
83 | write_register (SP_REGNUM, sp); | |
7def7fef | 84 | write_register (VAX_FP_REGNUM, sp); |
1d049c5e | 85 | write_register (VAX_AP_REGNUM, sp + (17 * 4)); |
52efde73 JT |
86 | } |
87 | ||
f267bd6a | 88 | static void |
52efde73 JT |
89 | vax_pop_frame (void) |
90 | { | |
7def7fef | 91 | CORE_ADDR fp = read_register (VAX_FP_REGNUM); |
52efde73 JT |
92 | int regnum; |
93 | int regmask = read_memory_integer (fp + 4, 4); | |
94 | ||
95 | write_register (PS_REGNUM, | |
96 | (regmask & 0xffff) | |
97 | | (read_register (PS_REGNUM) & 0xffff0000)); | |
98 | write_register (PC_REGNUM, read_memory_integer (fp + 16, 4)); | |
7def7fef | 99 | write_register (VAX_FP_REGNUM, read_memory_integer (fp + 12, 4)); |
1d049c5e | 100 | write_register (VAX_AP_REGNUM, read_memory_integer (fp + 8, 4)); |
52efde73 JT |
101 | fp += 16; |
102 | for (regnum = 0; regnum < 12; regnum++) | |
103 | if (regmask & (0x10000 << regnum)) | |
104 | write_register (regnum, read_memory_integer (fp += 4, 4)); | |
105 | fp = fp + 4 + ((regmask >> 30) & 3); | |
106 | if (regmask & 0x20000000) | |
107 | { | |
108 | regnum = read_memory_integer (fp, 4); | |
109 | fp += (regnum + 1) * 4; | |
110 | } | |
111 | write_register (SP_REGNUM, fp); | |
112 | flush_cached_frames (); | |
113 | } | |
a33f7558 JT |
114 | |
115 | /* The VAX call dummy sequence: | |
116 | ||
117 | calls #69, @#32323232 | |
118 | bpt | |
119 | ||
120 | It is 8 bytes long. The address and argc are patched by | |
121 | vax_fix_call_dummy(). */ | |
f267bd6a JT |
122 | static LONGEST vax_call_dummy_words[] = { 0x329f69fb, 0x03323232 }; |
123 | static int sizeof_vax_call_dummy_words = sizeof(vax_call_dummy_words); | |
a33f7558 | 124 | |
f267bd6a | 125 | static void |
a33f7558 JT |
126 | vax_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, |
127 | struct value **args, struct type *type, int gcc_p) | |
128 | { | |
129 | dummy[1] = nargs; | |
130 | store_unsigned_integer (dummy + 3, 4, fun); | |
131 | } | |
ab62c900 | 132 | \f |
f267bd6a | 133 | static void |
ea74468c JT |
134 | vax_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
135 | { | |
136 | write_register (1, addr); | |
137 | } | |
138 | ||
f267bd6a | 139 | static void |
ea74468c JT |
140 | vax_extract_return_value (struct type *valtype, char *regbuf, char *valbuf) |
141 | { | |
62700349 | 142 | memcpy (valbuf, regbuf + DEPRECATED_REGISTER_BYTE (0), TYPE_LENGTH (valtype)); |
ea74468c JT |
143 | } |
144 | ||
f267bd6a | 145 | static void |
ea74468c JT |
146 | vax_store_return_value (struct type *valtype, char *valbuf) |
147 | { | |
73937e03 | 148 | deprecated_write_register_bytes (0, valbuf, TYPE_LENGTH (valtype)); |
ea74468c | 149 | } |
ea74468c | 150 | \f |
5e6b39ff MK |
151 | |
152 | /* Use the program counter to determine the contents and size of a | |
153 | breakpoint instruction. Return a pointer to a string of bytes that | |
154 | encode a breakpoint instruction, store the length of the string in | |
155 | *LEN and optionally adjust *PC to point to the correct memory | |
156 | location for inserting the breakpoint. */ | |
157 | ||
1d049c5e | 158 | static const unsigned char * |
5e6b39ff | 159 | vax_breakpoint_from_pc (CORE_ADDR *pc, int *len) |
1d049c5e | 160 | { |
5e6b39ff | 161 | static unsigned char break_insn[] = { 3 }; |
1d049c5e | 162 | |
5e6b39ff MK |
163 | *len = sizeof (break_insn); |
164 | return break_insn; | |
1d049c5e JT |
165 | } |
166 | \f | |
b83266a0 SS |
167 | /* Advance PC across any function entry prologue instructions |
168 | to reach some "real" code. */ | |
169 | ||
f267bd6a | 170 | static CORE_ADDR |
fba45db2 | 171 | vax_skip_prologue (CORE_ADDR pc) |
b83266a0 | 172 | { |
52f0bd74 | 173 | int op = (unsigned char) read_memory_integer (pc, 1); |
b83266a0 | 174 | if (op == 0x11) |
c5aa993b | 175 | pc += 2; /* skip brb */ |
b83266a0 | 176 | if (op == 0x31) |
c5aa993b | 177 | pc += 3; /* skip brw */ |
b83266a0 | 178 | if (op == 0xC2 |
c5aa993b JM |
179 | && ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E) |
180 | pc += 3; /* skip subl2 */ | |
b83266a0 | 181 | if (op == 0x9E |
c5aa993b JM |
182 | && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE |
183 | && ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E) | |
184 | pc += 4; /* skip movab */ | |
b83266a0 | 185 | if (op == 0x9E |
c5aa993b JM |
186 | && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE |
187 | && ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E) | |
188 | pc += 5; /* skip movab */ | |
b83266a0 | 189 | if (op == 0x9E |
c5aa993b JM |
190 | && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE |
191 | && ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E) | |
192 | pc += 7; /* skip movab */ | |
b83266a0 SS |
193 | return pc; |
194 | } | |
7def7fef MK |
195 | \f |
196 | ||
197 | /* Unwinding the stack is relatively easy since the VAX has a | |
198 | dedicated frame pointer, and frames are set up automatically as the | |
199 | result of a function call. Most of the relevant information can be | |
200 | inferred from the documentation of the Procedure Call Instructions | |
201 | in the VAX MACRO and Instruction Set Reference Manual. */ | |
202 | ||
203 | struct vax_frame_cache | |
204 | { | |
205 | /* Base address. */ | |
206 | CORE_ADDR base; | |
207 | ||
208 | /* Table of saved registers. */ | |
209 | struct trad_frame_saved_reg *saved_regs; | |
210 | }; | |
211 | ||
212 | struct vax_frame_cache * | |
213 | vax_frame_cache (struct frame_info *next_frame, void **this_cache) | |
214 | { | |
215 | struct vax_frame_cache *cache; | |
216 | CORE_ADDR addr; | |
217 | ULONGEST mask; | |
218 | int regnum; | |
219 | ||
220 | if (*this_cache) | |
221 | return *this_cache; | |
222 | ||
223 | /* Allocate a new cache. */ | |
224 | cache = FRAME_OBSTACK_ZALLOC (struct vax_frame_cache); | |
225 | cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); | |
226 | ||
227 | /* The frame pointer is used as the base for the frame. */ | |
228 | cache->base = frame_unwind_register_unsigned (next_frame, VAX_FP_REGNUM); | |
229 | if (cache->base == 0) | |
230 | return cache; | |
231 | ||
232 | /* The register save mask and control bits determine the layout of | |
233 | the stack frame. */ | |
234 | mask = get_frame_memory_unsigned (next_frame, cache->base + 4, 4) >> 16; | |
235 | ||
236 | /* These are always saved. */ | |
237 | cache->saved_regs[VAX_PC_REGNUM].addr = cache->base + 16; | |
238 | cache->saved_regs[VAX_FP_REGNUM].addr = cache->base + 12; | |
239 | cache->saved_regs[VAX_AP_REGNUM].addr = cache->base + 8; | |
240 | cache->saved_regs[VAX_PS_REGNUM].addr = cache->base + 4; | |
241 | ||
242 | /* Scan the register save mask and record the location of the saved | |
243 | registers. */ | |
244 | addr = cache->base + 20; | |
245 | for (regnum = 0; regnum < VAX_AP_REGNUM; regnum++) | |
246 | { | |
247 | if (mask & (1 << regnum)) | |
248 | { | |
249 | cache->saved_regs[regnum].addr = addr; | |
250 | addr += 4; | |
251 | } | |
252 | } | |
253 | ||
254 | /* The CALLS/CALLG flag determines whether this frame has a General | |
255 | Argument List or a Stack Argument List. */ | |
256 | if (mask & (1 << 13)) | |
257 | { | |
258 | ULONGEST numarg; | |
259 | ||
260 | /* This is a procedure with Stack Argument List. Adjust the | |
261 | stack address for the arguments thet were pushed onto the | |
262 | stack. The return instruction will automatically pop the | |
263 | arguments from the stack. */ | |
264 | numarg = get_frame_memory_unsigned (next_frame, addr, 1); | |
265 | addr += 4 + numarg * 4; | |
266 | } | |
267 | ||
268 | /* Bits 1:0 of the stack pointer were saved in the control bits. */ | |
269 | trad_frame_set_value (cache->saved_regs, VAX_SP_REGNUM, addr + (mask >> 14)); | |
270 | ||
271 | return cache; | |
272 | } | |
273 | ||
274 | static void | |
275 | vax_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
276 | struct frame_id *this_id) | |
277 | { | |
278 | struct vax_frame_cache *cache = vax_frame_cache (next_frame, this_cache); | |
279 | ||
280 | /* This marks the outermost frame. */ | |
281 | if (cache->base == 0) | |
282 | return; | |
283 | ||
284 | (*this_id) = frame_id_build (cache->base, frame_pc_unwind (next_frame)); | |
285 | } | |
286 | ||
287 | static void | |
288 | vax_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
289 | int regnum, int *optimizedp, | |
290 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
291 | int *realnump, void *valuep) | |
292 | { | |
293 | struct vax_frame_cache *cache = vax_frame_cache (next_frame, this_cache); | |
294 | ||
295 | trad_frame_prev_register (next_frame, cache->saved_regs, regnum, | |
296 | optimizedp, lvalp, addrp, realnump, valuep); | |
297 | } | |
298 | ||
299 | static const struct frame_unwind vax_frame_unwind = | |
300 | { | |
301 | NORMAL_FRAME, | |
302 | vax_frame_this_id, | |
303 | vax_frame_prev_register | |
304 | }; | |
305 | ||
306 | static const struct frame_unwind * | |
307 | vax_frame_sniffer (struct frame_info *next_frame) | |
308 | { | |
309 | return &vax_frame_unwind; | |
310 | } | |
311 | \f | |
312 | ||
313 | static CORE_ADDR | |
314 | vax_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
315 | { | |
316 | struct vax_frame_cache *cache = vax_frame_cache (next_frame, this_cache); | |
317 | ||
318 | return cache->base; | |
319 | } | |
b83266a0 | 320 | |
f267bd6a | 321 | static CORE_ADDR |
7def7fef MK |
322 | vax_frame_args_address (struct frame_info *next_frame, void **this_cache) |
323 | { | |
324 | return frame_unwind_register_unsigned (next_frame, VAX_AP_REGNUM); | |
325 | } | |
326 | ||
327 | static const struct frame_base vax_frame_base = | |
a33f7558 | 328 | { |
7def7fef MK |
329 | &vax_frame_unwind, |
330 | vax_frame_base_address, | |
331 | vax_frame_base_address, | |
332 | vax_frame_args_address | |
333 | }; | |
334 | ||
335 | /* Return number of arguments for FRAME. */ | |
336 | ||
337 | static int | |
338 | vax_frame_num_args (struct frame_info *frame) | |
339 | { | |
340 | CORE_ADDR args; | |
341 | ||
342 | /* Assume that the argument pointer for the outermost frame is | |
343 | hosed, as is the case on NetBSD/vax ELF. */ | |
344 | if (get_frame_base (frame) == 0) | |
345 | return 0; | |
346 | ||
347 | args = get_frame_register_unsigned (frame, VAX_AP_REGNUM); | |
348 | return get_frame_memory_unsigned (frame, args, 1); | |
349 | } | |
350 | ||
351 | static CORE_ADDR | |
352 | vax_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
353 | { | |
354 | return frame_unwind_register_unsigned (next_frame, VAX_PC_REGNUM); | |
a33f7558 JT |
355 | } |
356 | \f | |
7def7fef | 357 | |
f267bd6a JT |
358 | /* Initialize the current architecture based on INFO. If possible, re-use an |
359 | architecture from ARCHES, which is a list of architectures already created | |
360 | during this debugging session. | |
361 | ||
362 | Called e.g. at program startup, when reading a core file, and when reading | |
363 | a binary file. */ | |
364 | ||
365 | static struct gdbarch * | |
366 | vax_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
367 | { | |
368 | struct gdbarch *gdbarch; | |
369 | ||
4be87837 DJ |
370 | /* If there is already a candidate, use it. */ |
371 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
372 | if (arches != NULL) | |
373 | return arches->gdbarch; | |
f267bd6a | 374 | |
4be87837 | 375 | gdbarch = gdbarch_alloc (&info, NULL); |
4791e091 | 376 | |
f267bd6a JT |
377 | /* Register info */ |
378 | set_gdbarch_num_regs (gdbarch, VAX_NUM_REGS); | |
5e6b39ff MK |
379 | set_gdbarch_register_name (gdbarch, vax_register_name); |
380 | set_gdbarch_register_type (gdbarch, vax_register_type); | |
f267bd6a | 381 | set_gdbarch_sp_regnum (gdbarch, VAX_SP_REGNUM); |
f267bd6a JT |
382 | set_gdbarch_pc_regnum (gdbarch, VAX_PC_REGNUM); |
383 | set_gdbarch_ps_regnum (gdbarch, VAX_PS_REGNUM); | |
384 | ||
f267bd6a JT |
385 | /* Frame and stack info */ |
386 | set_gdbarch_skip_prologue (gdbarch, vax_skip_prologue); | |
f267bd6a | 387 | set_gdbarch_frame_num_args (gdbarch, vax_frame_num_args); |
f267bd6a | 388 | |
f267bd6a JT |
389 | set_gdbarch_frame_args_skip (gdbarch, 4); |
390 | ||
5e6b39ff | 391 | /* Stack grows downward. */ |
f267bd6a JT |
392 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
393 | ||
394 | /* Return value info */ | |
4183d812 | 395 | set_gdbarch_deprecated_store_struct_return (gdbarch, vax_store_struct_return); |
26e9b323 | 396 | set_gdbarch_deprecated_extract_return_value (gdbarch, vax_extract_return_value); |
ebba8386 | 397 | set_gdbarch_deprecated_store_return_value (gdbarch, vax_store_return_value); |
f267bd6a JT |
398 | |
399 | /* Call dummy info */ | |
f3824013 | 400 | set_gdbarch_deprecated_push_dummy_frame (gdbarch, vax_push_dummy_frame); |
749b82f6 | 401 | set_gdbarch_deprecated_pop_frame (gdbarch, vax_pop_frame); |
f267bd6a | 402 | set_gdbarch_call_dummy_location (gdbarch, ON_STACK); |
b1e29e33 AC |
403 | set_gdbarch_deprecated_call_dummy_words (gdbarch, vax_call_dummy_words); |
404 | set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof_vax_call_dummy_words); | |
405 | set_gdbarch_deprecated_fix_call_dummy (gdbarch, vax_fix_call_dummy); | |
406 | set_gdbarch_deprecated_call_dummy_breakpoint_offset (gdbarch, 7); | |
07555a72 | 407 | set_gdbarch_deprecated_use_generic_dummy_frames (gdbarch, 0); |
ae45cd16 | 408 | set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_on_stack); |
f267bd6a JT |
409 | |
410 | /* Breakpoint info */ | |
1d049c5e | 411 | set_gdbarch_breakpoint_from_pc (gdbarch, vax_breakpoint_from_pc); |
f267bd6a JT |
412 | |
413 | /* Misc info */ | |
414 | set_gdbarch_function_start_offset (gdbarch, 2); | |
1d049c5e | 415 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); |
f267bd6a | 416 | |
6c0e89ed | 417 | /* Should be using push_dummy_call. */ |
b46e02f6 | 418 | set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp); |
6c0e89ed | 419 | |
7def7fef MK |
420 | set_gdbarch_unwind_pc (gdbarch, vax_unwind_pc); |
421 | ||
422 | frame_base_set_default (gdbarch, &vax_frame_base); | |
423 | ||
4791e091 | 424 | /* Hook in ABI-specific overrides, if they have been registered. */ |
4be87837 | 425 | gdbarch_init_osabi (info, gdbarch); |
4791e091 | 426 | |
7def7fef MK |
427 | frame_unwind_append_sniffer (gdbarch, vax_frame_sniffer); |
428 | ||
ee2842e2 ILT |
429 | set_gdbarch_print_insn (gdbarch, print_insn_vax); |
430 | ||
f267bd6a JT |
431 | return (gdbarch); |
432 | } | |
c906108c | 433 | |
a78f21af AC |
434 | extern initialize_file_ftype _initialize_vax_tdep; /* -Wmissing-prototypes */ |
435 | ||
c906108c | 436 | void |
fba45db2 | 437 | _initialize_vax_tdep (void) |
c906108c | 438 | { |
4be87837 | 439 | gdbarch_register (bfd_arch_vax, vax_gdbarch_init, NULL); |
c906108c | 440 | } |