| 1 | /* Print VAX instructions for GDB, the GNU debugger. |
| 2 | Copyright 1986, 1989, 1991, 1992, 1995, 1996, 1998, 1999, 2000, 2002 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 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. |
| 11 | |
| 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. |
| 16 | |
| 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. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "symtab.h" |
| 24 | #include "opcode/vax.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "inferior.h" |
| 27 | #include "regcache.h" |
| 28 | #include "frame.h" |
| 29 | #include "value.h" |
| 30 | #include "arch-utils.h" |
| 31 | |
| 32 | #include "vax-tdep.h" |
| 33 | |
| 34 | static gdbarch_register_name_ftype vax_register_name; |
| 35 | static gdbarch_register_byte_ftype vax_register_byte; |
| 36 | static gdbarch_register_raw_size_ftype vax_register_raw_size; |
| 37 | static gdbarch_register_virtual_size_ftype vax_register_virtual_size; |
| 38 | static gdbarch_register_virtual_type_ftype vax_register_virtual_type; |
| 39 | |
| 40 | static gdbarch_skip_prologue_ftype vax_skip_prologue; |
| 41 | static gdbarch_saved_pc_after_call_ftype vax_saved_pc_after_call; |
| 42 | static gdbarch_frame_num_args_ftype vax_frame_num_args; |
| 43 | static gdbarch_frame_chain_ftype vax_frame_chain; |
| 44 | static gdbarch_frame_saved_pc_ftype vax_frame_saved_pc; |
| 45 | static gdbarch_frame_args_address_ftype vax_frame_args_address; |
| 46 | static gdbarch_frame_locals_address_ftype vax_frame_locals_address; |
| 47 | static gdbarch_frame_init_saved_regs_ftype vax_frame_init_saved_regs; |
| 48 | |
| 49 | static gdbarch_store_struct_return_ftype vax_store_struct_return; |
| 50 | static gdbarch_deprecated_extract_return_value_ftype vax_extract_return_value; |
| 51 | static gdbarch_deprecated_extract_struct_value_address_ftype |
| 52 | vax_extract_struct_value_address; |
| 53 | |
| 54 | static gdbarch_push_dummy_frame_ftype vax_push_dummy_frame; |
| 55 | static gdbarch_pop_frame_ftype vax_pop_frame; |
| 56 | static gdbarch_fix_call_dummy_ftype vax_fix_call_dummy; |
| 57 | |
| 58 | /* Return 1 if P points to an invalid floating point value. |
| 59 | LEN is the length in bytes -- not relevant on the Vax. */ |
| 60 | |
| 61 | /* FIXME: cagney/2002-01-19: The macro below was originally defined in |
| 62 | tm-vax.h and used in values.c. Two problems. Firstly this is a |
| 63 | very non-portable and secondly it is wrong. The VAX should be |
| 64 | using floatformat and associated methods to identify and handle |
| 65 | invalid floating-point values. Adding to the poor target's woes |
| 66 | there is no floatformat_vax_{f,d} and no TARGET_FLOAT_FORMAT |
| 67 | et.al.. */ |
| 68 | |
| 69 | /* FIXME: cagney/2002-01-19: It turns out that the only thing that |
| 70 | uses this macro is the vax disassembler code (so how old is this |
| 71 | target?). This target should instead be using the opcodes |
| 72 | disassembler. That allowing the macro to be eliminated. */ |
| 73 | |
| 74 | #define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000) |
| 75 | |
| 76 | /* Vax instructions are never longer than this. */ |
| 77 | #define MAXLEN 62 |
| 78 | |
| 79 | /* Number of elements in the opcode table. */ |
| 80 | #define NOPCODES (sizeof votstrs / sizeof votstrs[0]) |
| 81 | |
| 82 | static unsigned char *print_insn_arg (); |
| 83 | \f |
| 84 | static const char * |
| 85 | vax_register_name (int regno) |
| 86 | { |
| 87 | static char *register_names[] = |
| 88 | { |
| 89 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 90 | "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", |
| 91 | "ps", |
| 92 | }; |
| 93 | |
| 94 | if (regno < 0) |
| 95 | return (NULL); |
| 96 | if (regno >= (sizeof(register_names) / sizeof(*register_names))) |
| 97 | return (NULL); |
| 98 | return (register_names[regno]); |
| 99 | } |
| 100 | |
| 101 | static int |
| 102 | vax_register_byte (int regno) |
| 103 | { |
| 104 | return (regno * 4); |
| 105 | } |
| 106 | |
| 107 | static int |
| 108 | vax_register_raw_size (int regno) |
| 109 | { |
| 110 | return (4); |
| 111 | } |
| 112 | |
| 113 | static int |
| 114 | vax_register_virtual_size (int regno) |
| 115 | { |
| 116 | return (4); |
| 117 | } |
| 118 | |
| 119 | static struct type * |
| 120 | vax_register_virtual_type (int regno) |
| 121 | { |
| 122 | return (builtin_type_int); |
| 123 | } |
| 124 | \f |
| 125 | static void |
| 126 | vax_frame_init_saved_regs (struct frame_info *frame) |
| 127 | { |
| 128 | int regnum, regmask; |
| 129 | CORE_ADDR next_addr; |
| 130 | |
| 131 | if (frame->saved_regs) |
| 132 | return; |
| 133 | |
| 134 | frame_saved_regs_zalloc (frame); |
| 135 | |
| 136 | regmask = read_memory_integer (frame->frame + 4, 4) >> 16; |
| 137 | |
| 138 | next_addr = frame->frame + 16; |
| 139 | |
| 140 | /* regmask's low bit is for register 0, which is the first one |
| 141 | what would be pushed. */ |
| 142 | for (regnum = 0; regnum < VAX_AP_REGNUM; regnum++) |
| 143 | { |
| 144 | if (regmask & (1 << regnum)) |
| 145 | frame->saved_regs[regnum] = next_addr += 4; |
| 146 | } |
| 147 | |
| 148 | frame->saved_regs[SP_REGNUM] = next_addr + 4; |
| 149 | if (regmask & (1 << FP_REGNUM)) |
| 150 | frame->saved_regs[SP_REGNUM] += |
| 151 | 4 + (4 * read_memory_integer (next_addr + 4, 4)); |
| 152 | |
| 153 | frame->saved_regs[PC_REGNUM] = frame->frame + 16; |
| 154 | frame->saved_regs[FP_REGNUM] = frame->frame + 12; |
| 155 | frame->saved_regs[VAX_AP_REGNUM] = frame->frame + 8; |
| 156 | frame->saved_regs[PS_REGNUM] = frame->frame + 4; |
| 157 | } |
| 158 | |
| 159 | static CORE_ADDR |
| 160 | vax_frame_saved_pc (struct frame_info *frame) |
| 161 | { |
| 162 | if (frame->signal_handler_caller) |
| 163 | return (sigtramp_saved_pc (frame)); /* XXXJRT */ |
| 164 | |
| 165 | return (read_memory_integer (frame->frame + 16, 4)); |
| 166 | } |
| 167 | |
| 168 | CORE_ADDR |
| 169 | vax_frame_args_address_correct (struct frame_info *frame) |
| 170 | { |
| 171 | /* Cannot find the AP register value directly from the FP value. Must |
| 172 | find it saved in the frame called by this one, or in the AP register |
| 173 | for the innermost frame. However, there is no way to tell the |
| 174 | difference between the innermost frame and a frame for which we |
| 175 | just don't know the frame that it called (e.g. "info frame 0x7ffec789"). |
| 176 | For the sake of argument, suppose that the stack is somewhat trashed |
| 177 | (which is one reason that "info frame" exists). So, return 0 (indicating |
| 178 | we don't know the address of the arglist) if we don't know what frame |
| 179 | this frame calls. */ |
| 180 | if (frame->next) |
| 181 | return (read_memory_integer (frame->next->frame + 8, 4)); |
| 182 | |
| 183 | return (0); |
| 184 | } |
| 185 | |
| 186 | static CORE_ADDR |
| 187 | vax_frame_args_address (struct frame_info *frame) |
| 188 | { |
| 189 | /* In most of GDB, getting the args address is too important to |
| 190 | just say "I don't know". This is sometimes wrong for functions |
| 191 | that aren't on top of the stack, but c'est la vie. */ |
| 192 | if (frame->next) |
| 193 | return (read_memory_integer (frame->next->frame + 8, 4)); |
| 194 | |
| 195 | return (read_register (VAX_AP_REGNUM)); |
| 196 | } |
| 197 | |
| 198 | static CORE_ADDR |
| 199 | vax_frame_locals_address (struct frame_info *frame) |
| 200 | { |
| 201 | return (frame->frame); |
| 202 | } |
| 203 | |
| 204 | static int |
| 205 | vax_frame_num_args (struct frame_info *fi) |
| 206 | { |
| 207 | return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1)); |
| 208 | } |
| 209 | |
| 210 | static CORE_ADDR |
| 211 | vax_frame_chain (struct frame_info *frame) |
| 212 | { |
| 213 | /* In the case of the VAX, the frame's nominal address is the FP value, |
| 214 | and 12 bytes later comes the saved previous FP value as a 4-byte word. */ |
| 215 | if (inside_entry_file (frame->pc)) |
| 216 | return (0); |
| 217 | |
| 218 | return (read_memory_integer (frame->frame + 12, 4)); |
| 219 | } |
| 220 | \f |
| 221 | static void |
| 222 | vax_push_dummy_frame (void) |
| 223 | { |
| 224 | CORE_ADDR sp = read_register (SP_REGNUM); |
| 225 | int regnum; |
| 226 | |
| 227 | sp = push_word (sp, 0); /* arglist */ |
| 228 | for (regnum = 11; regnum >= 0; regnum--) |
| 229 | sp = push_word (sp, read_register (regnum)); |
| 230 | sp = push_word (sp, read_register (PC_REGNUM)); |
| 231 | sp = push_word (sp, read_register (FP_REGNUM)); |
| 232 | sp = push_word (sp, read_register (VAX_AP_REGNUM)); |
| 233 | sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef) + 0x2fff0000); |
| 234 | sp = push_word (sp, 0); |
| 235 | write_register (SP_REGNUM, sp); |
| 236 | write_register (FP_REGNUM, sp); |
| 237 | write_register (VAX_AP_REGNUM, sp + (17 * 4)); |
| 238 | } |
| 239 | |
| 240 | static void |
| 241 | vax_pop_frame (void) |
| 242 | { |
| 243 | CORE_ADDR fp = read_register (FP_REGNUM); |
| 244 | int regnum; |
| 245 | int regmask = read_memory_integer (fp + 4, 4); |
| 246 | |
| 247 | write_register (PS_REGNUM, |
| 248 | (regmask & 0xffff) |
| 249 | | (read_register (PS_REGNUM) & 0xffff0000)); |
| 250 | write_register (PC_REGNUM, read_memory_integer (fp + 16, 4)); |
| 251 | write_register (FP_REGNUM, read_memory_integer (fp + 12, 4)); |
| 252 | write_register (VAX_AP_REGNUM, read_memory_integer (fp + 8, 4)); |
| 253 | fp += 16; |
| 254 | for (regnum = 0; regnum < 12; regnum++) |
| 255 | if (regmask & (0x10000 << regnum)) |
| 256 | write_register (regnum, read_memory_integer (fp += 4, 4)); |
| 257 | fp = fp + 4 + ((regmask >> 30) & 3); |
| 258 | if (regmask & 0x20000000) |
| 259 | { |
| 260 | regnum = read_memory_integer (fp, 4); |
| 261 | fp += (regnum + 1) * 4; |
| 262 | } |
| 263 | write_register (SP_REGNUM, fp); |
| 264 | flush_cached_frames (); |
| 265 | } |
| 266 | |
| 267 | /* The VAX call dummy sequence: |
| 268 | |
| 269 | calls #69, @#32323232 |
| 270 | bpt |
| 271 | |
| 272 | It is 8 bytes long. The address and argc are patched by |
| 273 | vax_fix_call_dummy(). */ |
| 274 | static LONGEST vax_call_dummy_words[] = { 0x329f69fb, 0x03323232 }; |
| 275 | static int sizeof_vax_call_dummy_words = sizeof(vax_call_dummy_words); |
| 276 | |
| 277 | static void |
| 278 | vax_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, |
| 279 | struct value **args, struct type *type, int gcc_p) |
| 280 | { |
| 281 | dummy[1] = nargs; |
| 282 | store_unsigned_integer (dummy + 3, 4, fun); |
| 283 | } |
| 284 | \f |
| 285 | static void |
| 286 | vax_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
| 287 | { |
| 288 | write_register (1, addr); |
| 289 | } |
| 290 | |
| 291 | static void |
| 292 | vax_extract_return_value (struct type *valtype, char *regbuf, char *valbuf) |
| 293 | { |
| 294 | memcpy (valbuf, regbuf + REGISTER_BYTE (0), TYPE_LENGTH (valtype)); |
| 295 | } |
| 296 | |
| 297 | static void |
| 298 | vax_store_return_value (struct type *valtype, char *valbuf) |
| 299 | { |
| 300 | write_register_bytes (0, valbuf, TYPE_LENGTH (valtype)); |
| 301 | } |
| 302 | |
| 303 | static CORE_ADDR |
| 304 | vax_extract_struct_value_address (char *regbuf) |
| 305 | { |
| 306 | return (extract_address (regbuf + REGISTER_BYTE (0), REGISTER_RAW_SIZE (0))); |
| 307 | } |
| 308 | \f |
| 309 | static const unsigned char * |
| 310 | vax_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
| 311 | { |
| 312 | static const unsigned char vax_breakpoint[] = { 3 }; |
| 313 | |
| 314 | *lenptr = sizeof(vax_breakpoint); |
| 315 | return (vax_breakpoint); |
| 316 | } |
| 317 | \f |
| 318 | /* Advance PC across any function entry prologue instructions |
| 319 | to reach some "real" code. */ |
| 320 | |
| 321 | static CORE_ADDR |
| 322 | vax_skip_prologue (CORE_ADDR pc) |
| 323 | { |
| 324 | register int op = (unsigned char) read_memory_integer (pc, 1); |
| 325 | if (op == 0x11) |
| 326 | pc += 2; /* skip brb */ |
| 327 | if (op == 0x31) |
| 328 | pc += 3; /* skip brw */ |
| 329 | if (op == 0xC2 |
| 330 | && ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E) |
| 331 | pc += 3; /* skip subl2 */ |
| 332 | if (op == 0x9E |
| 333 | && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE |
| 334 | && ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E) |
| 335 | pc += 4; /* skip movab */ |
| 336 | if (op == 0x9E |
| 337 | && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE |
| 338 | && ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E) |
| 339 | pc += 5; /* skip movab */ |
| 340 | if (op == 0x9E |
| 341 | && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE |
| 342 | && ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E) |
| 343 | pc += 7; /* skip movab */ |
| 344 | return pc; |
| 345 | } |
| 346 | |
| 347 | static CORE_ADDR |
| 348 | vax_saved_pc_after_call (struct frame_info *frame) |
| 349 | { |
| 350 | return (FRAME_SAVED_PC(frame)); |
| 351 | } |
| 352 | \f |
| 353 | /* Print the vax instruction at address MEMADDR in debugged memory, |
| 354 | from disassembler info INFO. |
| 355 | Returns length of the instruction, in bytes. */ |
| 356 | |
| 357 | static int |
| 358 | vax_print_insn (CORE_ADDR memaddr, disassemble_info *info) |
| 359 | { |
| 360 | unsigned char buffer[MAXLEN]; |
| 361 | register int i; |
| 362 | register unsigned char *p; |
| 363 | const char *d; |
| 364 | |
| 365 | int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info); |
| 366 | if (status != 0) |
| 367 | { |
| 368 | (*info->memory_error_func) (status, memaddr, info); |
| 369 | return -1; |
| 370 | } |
| 371 | |
| 372 | for (i = 0; i < NOPCODES; i++) |
| 373 | if (votstrs[i].detail.code == buffer[0] |
| 374 | || votstrs[i].detail.code == *(unsigned short *) buffer) |
| 375 | break; |
| 376 | |
| 377 | /* Handle undefined instructions. */ |
| 378 | if (i == NOPCODES) |
| 379 | { |
| 380 | (*info->fprintf_func) (info->stream, "0%o", buffer[0]); |
| 381 | return 1; |
| 382 | } |
| 383 | |
| 384 | (*info->fprintf_func) (info->stream, "%s", votstrs[i].name); |
| 385 | |
| 386 | /* Point at first byte of argument data, |
| 387 | and at descriptor for first argument. */ |
| 388 | p = buffer + 1 + (votstrs[i].detail.code >= 0x100); |
| 389 | d = votstrs[i].detail.args; |
| 390 | |
| 391 | if (*d) |
| 392 | (*info->fprintf_func) (info->stream, " "); |
| 393 | |
| 394 | while (*d) |
| 395 | { |
| 396 | p = print_insn_arg (d, p, memaddr + (p - buffer), info); |
| 397 | d += 2; |
| 398 | if (*d) |
| 399 | (*info->fprintf_func) (info->stream, ","); |
| 400 | } |
| 401 | return p - buffer; |
| 402 | } |
| 403 | \f |
| 404 | static unsigned char * |
| 405 | print_insn_arg (char *d, register char *p, CORE_ADDR addr, |
| 406 | disassemble_info *info) |
| 407 | { |
| 408 | register int regnum = *p & 0xf; |
| 409 | float floatlitbuf; |
| 410 | |
| 411 | if (*d == 'b') |
| 412 | { |
| 413 | if (d[1] == 'b') |
| 414 | (*info->fprintf_func) (info->stream, "0x%x", addr + *p++ + 1); |
| 415 | else |
| 416 | { |
| 417 | (*info->fprintf_func) (info->stream, "0x%x", addr + *(short *) p + 2); |
| 418 | p += 2; |
| 419 | } |
| 420 | } |
| 421 | else |
| 422 | switch ((*p++ >> 4) & 0xf) |
| 423 | { |
| 424 | case 0: |
| 425 | case 1: |
| 426 | case 2: |
| 427 | case 3: /* Literal mode */ |
| 428 | if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') |
| 429 | { |
| 430 | *(int *) &floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); |
| 431 | (*info->fprintf_func) (info->stream, "$%f", floatlitbuf); |
| 432 | } |
| 433 | else |
| 434 | (*info->fprintf_func) (info->stream, "$%d", p[-1] & 0x3f); |
| 435 | break; |
| 436 | |
| 437 | case 4: /* Indexed */ |
| 438 | p = (char *) print_insn_arg (d, p, addr + 1, info); |
| 439 | (*info->fprintf_func) (info->stream, "[%s]", REGISTER_NAME (regnum)); |
| 440 | break; |
| 441 | |
| 442 | case 5: /* Register */ |
| 443 | (*info->fprintf_func) (info->stream, REGISTER_NAME (regnum)); |
| 444 | break; |
| 445 | |
| 446 | case 7: /* Autodecrement */ |
| 447 | (*info->fprintf_func) (info->stream, "-"); |
| 448 | case 6: /* Register deferred */ |
| 449 | (*info->fprintf_func) (info->stream, "(%s)", REGISTER_NAME (regnum)); |
| 450 | break; |
| 451 | |
| 452 | case 9: /* Autoincrement deferred */ |
| 453 | (*info->fprintf_func) (info->stream, "@"); |
| 454 | if (regnum == PC_REGNUM) |
| 455 | { |
| 456 | (*info->fprintf_func) (info->stream, "#"); |
| 457 | info->target = *(long *) p; |
| 458 | (*info->print_address_func) (info->target, info); |
| 459 | p += 4; |
| 460 | break; |
| 461 | } |
| 462 | case 8: /* Autoincrement */ |
| 463 | if (regnum == PC_REGNUM) |
| 464 | { |
| 465 | (*info->fprintf_func) (info->stream, "#"); |
| 466 | switch (d[1]) |
| 467 | { |
| 468 | case 'b': |
| 469 | (*info->fprintf_func) (info->stream, "%d", *p++); |
| 470 | break; |
| 471 | |
| 472 | case 'w': |
| 473 | (*info->fprintf_func) (info->stream, "%d", *(short *) p); |
| 474 | p += 2; |
| 475 | break; |
| 476 | |
| 477 | case 'l': |
| 478 | (*info->fprintf_func) (info->stream, "%d", *(long *) p); |
| 479 | p += 4; |
| 480 | break; |
| 481 | |
| 482 | case 'q': |
| 483 | (*info->fprintf_func) (info->stream, "0x%x%08x", |
| 484 | ((long *) p)[1], ((long *) p)[0]); |
| 485 | p += 8; |
| 486 | break; |
| 487 | |
| 488 | case 'o': |
| 489 | (*info->fprintf_func) (info->stream, "0x%x%08x%08x%08x", |
| 490 | ((long *) p)[3], ((long *) p)[2], |
| 491 | ((long *) p)[1], ((long *) p)[0]); |
| 492 | p += 16; |
| 493 | break; |
| 494 | |
| 495 | case 'f': |
| 496 | if (INVALID_FLOAT (p, 4)) |
| 497 | (*info->fprintf_func) (info->stream, |
| 498 | "<<invalid float 0x%x>>", |
| 499 | *(int *) p); |
| 500 | else |
| 501 | (*info->fprintf_func) (info->stream, "%f", *(float *) p); |
| 502 | p += 4; |
| 503 | break; |
| 504 | |
| 505 | case 'd': |
| 506 | if (INVALID_FLOAT (p, 8)) |
| 507 | (*info->fprintf_func) (info->stream, |
| 508 | "<<invalid float 0x%x%08x>>", |
| 509 | ((long *) p)[1], ((long *) p)[0]); |
| 510 | else |
| 511 | (*info->fprintf_func) (info->stream, "%f", *(double *) p); |
| 512 | p += 8; |
| 513 | break; |
| 514 | |
| 515 | case 'g': |
| 516 | (*info->fprintf_func) (info->stream, "g-float"); |
| 517 | p += 8; |
| 518 | break; |
| 519 | |
| 520 | case 'h': |
| 521 | (*info->fprintf_func) (info->stream, "h-float"); |
| 522 | p += 16; |
| 523 | break; |
| 524 | |
| 525 | } |
| 526 | } |
| 527 | else |
| 528 | (*info->fprintf_func) (info->stream, "(%s)+", REGISTER_NAME (regnum)); |
| 529 | break; |
| 530 | |
| 531 | case 11: /* Byte displacement deferred */ |
| 532 | (*info->fprintf_func) (info->stream, "@"); |
| 533 | case 10: /* Byte displacement */ |
| 534 | if (regnum == PC_REGNUM) |
| 535 | { |
| 536 | info->target = addr + *p + 2; |
| 537 | (*info->print_address_func) (info->target, info); |
| 538 | } |
| 539 | else |
| 540 | (*info->fprintf_func) (info->stream, "%d(%s)", *p, REGISTER_NAME (regnum)); |
| 541 | p += 1; |
| 542 | break; |
| 543 | |
| 544 | case 13: /* Word displacement deferred */ |
| 545 | (*info->fprintf_func) (info->stream, "@"); |
| 546 | case 12: /* Word displacement */ |
| 547 | if (regnum == PC_REGNUM) |
| 548 | { |
| 549 | info->target = addr + *(short *) p + 3; |
| 550 | (*info->print_address_func) (info->target, info); |
| 551 | } |
| 552 | else |
| 553 | (*info->fprintf_func) (info->stream, "%d(%s)", |
| 554 | *(short *) p, REGISTER_NAME (regnum)); |
| 555 | p += 2; |
| 556 | break; |
| 557 | |
| 558 | case 15: /* Long displacement deferred */ |
| 559 | (*info->fprintf_func) (info->stream, "@"); |
| 560 | case 14: /* Long displacement */ |
| 561 | if (regnum == PC_REGNUM) |
| 562 | { |
| 563 | info->target = addr + *(short *) p + 5; |
| 564 | (*info->print_address_func) (info->target, info); |
| 565 | } |
| 566 | else |
| 567 | (*info->fprintf_func) (info->stream, "%d(%s)", |
| 568 | *(long *) p, REGISTER_NAME (regnum)); |
| 569 | p += 4; |
| 570 | } |
| 571 | |
| 572 | return (unsigned char *) p; |
| 573 | } |
| 574 | \f |
| 575 | /* Initialize the current architecture based on INFO. If possible, re-use an |
| 576 | architecture from ARCHES, which is a list of architectures already created |
| 577 | during this debugging session. |
| 578 | |
| 579 | Called e.g. at program startup, when reading a core file, and when reading |
| 580 | a binary file. */ |
| 581 | |
| 582 | static struct gdbarch * |
| 583 | vax_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 584 | { |
| 585 | struct gdbarch_tdep *tdep; |
| 586 | struct gdbarch *gdbarch; |
| 587 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
| 588 | |
| 589 | /* Try to determine the ABI of the object we are loading. */ |
| 590 | |
| 591 | if (info.abfd != NULL) |
| 592 | osabi = gdbarch_lookup_osabi (info.abfd); |
| 593 | |
| 594 | /* Find a candidate among extant architectures. */ |
| 595 | for (arches = gdbarch_list_lookup_by_info (arches, &info); |
| 596 | arches != NULL; |
| 597 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) |
| 598 | { |
| 599 | /* Make sure the ABI selection matches. */ |
| 600 | tdep = gdbarch_tdep (arches->gdbarch); |
| 601 | if (tdep && tdep->osabi == osabi) |
| 602 | return arches->gdbarch; |
| 603 | } |
| 604 | |
| 605 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
| 606 | gdbarch = gdbarch_alloc (&info, tdep); |
| 607 | |
| 608 | tdep->osabi = osabi; |
| 609 | |
| 610 | /* Register info */ |
| 611 | set_gdbarch_num_regs (gdbarch, VAX_NUM_REGS); |
| 612 | set_gdbarch_sp_regnum (gdbarch, VAX_SP_REGNUM); |
| 613 | set_gdbarch_fp_regnum (gdbarch, VAX_FP_REGNUM); |
| 614 | set_gdbarch_pc_regnum (gdbarch, VAX_PC_REGNUM); |
| 615 | set_gdbarch_ps_regnum (gdbarch, VAX_PS_REGNUM); |
| 616 | |
| 617 | set_gdbarch_register_name (gdbarch, vax_register_name); |
| 618 | set_gdbarch_register_size (gdbarch, VAX_REGISTER_SIZE); |
| 619 | set_gdbarch_register_bytes (gdbarch, VAX_REGISTER_BYTES); |
| 620 | set_gdbarch_register_byte (gdbarch, vax_register_byte); |
| 621 | set_gdbarch_register_raw_size (gdbarch, vax_register_raw_size); |
| 622 | set_gdbarch_max_register_raw_size (gdbarch, VAX_MAX_REGISTER_RAW_SIZE); |
| 623 | set_gdbarch_register_virtual_size (gdbarch, vax_register_virtual_size); |
| 624 | set_gdbarch_max_register_virtual_size (gdbarch, |
| 625 | VAX_MAX_REGISTER_VIRTUAL_SIZE); |
| 626 | set_gdbarch_register_virtual_type (gdbarch, vax_register_virtual_type); |
| 627 | |
| 628 | /* Frame and stack info */ |
| 629 | set_gdbarch_skip_prologue (gdbarch, vax_skip_prologue); |
| 630 | set_gdbarch_saved_pc_after_call (gdbarch, vax_saved_pc_after_call); |
| 631 | |
| 632 | set_gdbarch_frame_num_args (gdbarch, vax_frame_num_args); |
| 633 | set_gdbarch_frameless_function_invocation (gdbarch, |
| 634 | generic_frameless_function_invocation_not); |
| 635 | |
| 636 | set_gdbarch_frame_chain (gdbarch, vax_frame_chain); |
| 637 | set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid); |
| 638 | set_gdbarch_frame_saved_pc (gdbarch, vax_frame_saved_pc); |
| 639 | |
| 640 | set_gdbarch_frame_args_address (gdbarch, vax_frame_args_address); |
| 641 | set_gdbarch_frame_locals_address (gdbarch, vax_frame_locals_address); |
| 642 | |
| 643 | set_gdbarch_frame_init_saved_regs (gdbarch, vax_frame_init_saved_regs); |
| 644 | |
| 645 | set_gdbarch_frame_args_skip (gdbarch, 4); |
| 646 | |
| 647 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 648 | |
| 649 | /* Return value info */ |
| 650 | set_gdbarch_store_struct_return (gdbarch, vax_store_struct_return); |
| 651 | set_gdbarch_deprecated_extract_return_value (gdbarch, vax_extract_return_value); |
| 652 | set_gdbarch_deprecated_store_return_value (gdbarch, vax_store_return_value); |
| 653 | set_gdbarch_deprecated_extract_struct_value_address (gdbarch, vax_extract_struct_value_address); |
| 654 | |
| 655 | /* Call dummy info */ |
| 656 | set_gdbarch_push_dummy_frame (gdbarch, vax_push_dummy_frame); |
| 657 | set_gdbarch_pop_frame (gdbarch, vax_pop_frame); |
| 658 | set_gdbarch_call_dummy_location (gdbarch, ON_STACK); |
| 659 | set_gdbarch_call_dummy_p (gdbarch, 1); |
| 660 | set_gdbarch_call_dummy_words (gdbarch, vax_call_dummy_words); |
| 661 | set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof_vax_call_dummy_words); |
| 662 | set_gdbarch_fix_call_dummy (gdbarch, vax_fix_call_dummy); |
| 663 | set_gdbarch_call_dummy_start_offset (gdbarch, 0); |
| 664 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); |
| 665 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 7); |
| 666 | set_gdbarch_use_generic_dummy_frames (gdbarch, 0); |
| 667 | set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_on_stack); |
| 668 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); |
| 669 | |
| 670 | /* Breakpoint info */ |
| 671 | set_gdbarch_breakpoint_from_pc (gdbarch, vax_breakpoint_from_pc); |
| 672 | set_gdbarch_decr_pc_after_break (gdbarch, 0); |
| 673 | |
| 674 | /* Misc info */ |
| 675 | set_gdbarch_function_start_offset (gdbarch, 2); |
| 676 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); |
| 677 | |
| 678 | /* Hook in ABI-specific overrides, if they have been registered. */ |
| 679 | gdbarch_init_osabi (info, gdbarch, osabi); |
| 680 | |
| 681 | return (gdbarch); |
| 682 | } |
| 683 | |
| 684 | static void |
| 685 | vax_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) |
| 686 | { |
| 687 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 688 | |
| 689 | if (tdep == NULL) |
| 690 | return; |
| 691 | |
| 692 | fprintf_unfiltered (file, "vax_dump_tdep: OS ABI = %s\n", |
| 693 | gdbarch_osabi_name (tdep->osabi)); |
| 694 | } |
| 695 | |
| 696 | void |
| 697 | _initialize_vax_tdep (void) |
| 698 | { |
| 699 | gdbarch_register (bfd_arch_vax, vax_gdbarch_init, vax_dump_tdep); |
| 700 | |
| 701 | tm_print_insn = vax_print_insn; |
| 702 | } |