| 1 | /* Parameters for execution on a 68000 series machine. |
| 2 | Copyright 1986, 1987, 1989, 1990, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | /* Generic 68000 stuff, to be included by other tm-*.h files. |
| 21 | Define HAVE_68881 if that is the case. */ |
| 22 | |
| 23 | #if defined (HAVE_68881) |
| 24 | #define IEEE_FLOAT 1 |
| 25 | #endif |
| 26 | |
| 27 | /* Define the bit, byte, and word ordering of the machine. */ |
| 28 | #define TARGET_BYTE_ORDER BIG_ENDIAN |
| 29 | |
| 30 | /* Offset from address of function to start of its code. |
| 31 | Zero on most machines. */ |
| 32 | |
| 33 | #define FUNCTION_START_OFFSET 0 |
| 34 | |
| 35 | /* Advance PC across any function entry prologue instructions |
| 36 | to reach some "real" code. */ |
| 37 | |
| 38 | #if !defined(SKIP_PROLOGUE) |
| 39 | #define SKIP_PROLOGUE(ip) {(ip) = m68k_skip_prologue(ip);} |
| 40 | extern CORE_ADDR m68k_skip_prologue PARAMS ((CORE_ADDR ip)); |
| 41 | #endif |
| 42 | |
| 43 | /* Immediately after a function call, return the saved pc. |
| 44 | Can't always go through the frames for this because on some machines |
| 45 | the new frame is not set up until the new function executes |
| 46 | some instructions. */ |
| 47 | |
| 48 | #define SAVED_PC_AFTER_CALL(frame) \ |
| 49 | read_memory_integer (read_register (SP_REGNUM), 4) |
| 50 | |
| 51 | /* Stack grows downward. */ |
| 52 | |
| 53 | #define INNER_THAN < |
| 54 | |
| 55 | /* Sequence of bytes for breakpoint instruction. |
| 56 | This is a TRAP instruction. The last 4 bits (0xf below) is the |
| 57 | vector. Systems which don't use 0xf should define BPT_VECTOR |
| 58 | themselves before including this file. */ |
| 59 | |
| 60 | #if !defined (BPT_VECTOR) |
| 61 | #define BPT_VECTOR 0xf |
| 62 | #endif |
| 63 | |
| 64 | #if !defined (BREAKPOINT) |
| 65 | #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)} |
| 66 | #endif |
| 67 | |
| 68 | /* If your kernel resets the pc after the trap happens you may need to |
| 69 | define this before including this file. */ |
| 70 | |
| 71 | #if !defined (DECR_PC_AFTER_BREAK) |
| 72 | #define DECR_PC_AFTER_BREAK 2 |
| 73 | #endif |
| 74 | |
| 75 | /* Nonzero if instruction at PC is a return instruction. */ |
| 76 | /* Allow any of the return instructions, including a trapv and a return |
| 77 | from interupt. */ |
| 78 | |
| 79 | #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74) |
| 80 | |
| 81 | /* Return 1 if P points to an invalid floating point value. */ |
| 82 | |
| 83 | #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */ |
| 84 | |
| 85 | /* Say how long registers are. */ |
| 86 | |
| 87 | #define REGISTER_TYPE long |
| 88 | |
| 89 | #if defined (HAVE_68881) |
| 90 | # if defined (GDB_TARGET_IS_SUN3) |
| 91 | /* Sun3 status includes fpflags, which shows whether the FPU has been used |
| 92 | by the process, and whether the FPU was done with an instruction or |
| 93 | was interrupted in the middle of a long instruction. See |
| 94 | <machine/reg.h>. */ |
| 95 | /* a&d, pc,sr, fp, fpstat, fpflags */ |
| 96 | # define NUM_REGS 31 |
| 97 | # define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4 + 4) |
| 98 | # else /* Not sun3. */ |
| 99 | # define NUM_REGS 29 |
| 100 | # define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4) |
| 101 | # endif /* Not sun3. */ |
| 102 | #else /* No 68881. */ |
| 103 | # define NUM_REGS 18 |
| 104 | # define REGISTER_BYTES (16*4 + 8) |
| 105 | #endif /* No 68881. */ |
| 106 | |
| 107 | /* Index within `registers' of the first byte of the space for |
| 108 | register N. */ |
| 109 | |
| 110 | #if defined (HAVE_68881) |
| 111 | #define REGISTER_BYTE(N) \ |
| 112 | ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168 \ |
| 113 | : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72 \ |
| 114 | : (N) * 4) |
| 115 | |
| 116 | /* Number of bytes of storage in the actual machine representation |
| 117 | for register N. On the 68000, all regs are 4 bytes |
| 118 | except the floating point regs which are 12 bytes. */ |
| 119 | /* Note that the unsigned cast here forces the result of the |
| 120 | subtraction to very high positive values if N < FP0_REGNUM */ |
| 121 | |
| 122 | #define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4) |
| 123 | |
| 124 | /* Number of bytes of storage in the program's representation |
| 125 | for register N. On the 68000, all regs are 4 bytes |
| 126 | except the floating point regs which are 8-byte doubles. */ |
| 127 | |
| 128 | #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4) |
| 129 | |
| 130 | /* Largest value REGISTER_RAW_SIZE can have. */ |
| 131 | |
| 132 | #define MAX_REGISTER_RAW_SIZE 12 |
| 133 | |
| 134 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
| 135 | |
| 136 | #define MAX_REGISTER_VIRTUAL_SIZE 8 |
| 137 | |
| 138 | /* Nonzero if register N requires conversion |
| 139 | from raw format to virtual format. */ |
| 140 | |
| 141 | #define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8) |
| 142 | |
| 143 | /* Put the declaration out here because if it's in the macros, PCC |
| 144 | will complain. */ |
| 145 | extern const struct ext_format ext_format_68881; |
| 146 | |
| 147 | /* Convert data from raw format for register REGNUM |
| 148 | to virtual format for register REGNUM. */ |
| 149 | |
| 150 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ |
| 151 | { \ |
| 152 | if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \ |
| 153 | ieee_extended_to_double (&ext_format_68881, (FROM), (double *)(TO)); \ |
| 154 | else \ |
| 155 | memcpy ((TO), (FROM), 4); \ |
| 156 | } |
| 157 | |
| 158 | /* Convert data from virtual format for register REGNUM |
| 159 | to raw format for register REGNUM. */ |
| 160 | |
| 161 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ |
| 162 | { \ |
| 163 | if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \ |
| 164 | double_to_ieee_extended (&ext_format_68881, (double *)(FROM), (TO)); \ |
| 165 | else \ |
| 166 | memcpy ((TO), (FROM), 4); \ |
| 167 | } |
| 168 | |
| 169 | /* Return the GDB type object for the "standard" data type |
| 170 | of data in register N. */ |
| 171 | /* Note, for registers which contain addresses return |
| 172 | pointer to void, not pointer to char, because we don't |
| 173 | want to attempt to print the string after printing the address. */ |
| 174 | #define REGISTER_VIRTUAL_TYPE(N) \ |
| 175 | (((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double : \ |
| 176 | (N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM ? \ |
| 177 | lookup_pointer_type (builtin_type_void) : builtin_type_int) |
| 178 | |
| 179 | #else /* no 68881. */ |
| 180 | /* Index within `registers' of the first byte of the space for |
| 181 | register N. */ |
| 182 | |
| 183 | #define REGISTER_BYTE(N) ((N) * 4) |
| 184 | |
| 185 | /* Number of bytes of storage in the actual machine representation |
| 186 | for register N. On the 68000, all regs are 4 bytes. */ |
| 187 | |
| 188 | #define REGISTER_RAW_SIZE(N) 4 |
| 189 | |
| 190 | /* Number of bytes of storage in the program's representation |
| 191 | for register N. On the 68000, all regs are 4 bytes. */ |
| 192 | |
| 193 | #define REGISTER_VIRTUAL_SIZE(N) 4 |
| 194 | |
| 195 | /* Largest value REGISTER_RAW_SIZE can have. */ |
| 196 | |
| 197 | #define MAX_REGISTER_RAW_SIZE 4 |
| 198 | |
| 199 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
| 200 | |
| 201 | #define MAX_REGISTER_VIRTUAL_SIZE 4 |
| 202 | |
| 203 | /* Nonzero if register N requires conversion |
| 204 | from raw format to virtual format. */ |
| 205 | |
| 206 | #define REGISTER_CONVERTIBLE(N) 0 |
| 207 | |
| 208 | /* Convert data from raw format for register REGNUM |
| 209 | to virtual format for register REGNUM. */ |
| 210 | |
| 211 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) memcpy ((TO), (FROM), 4); |
| 212 | |
| 213 | /* Convert data from virtual format for register REGNUM |
| 214 | to raw format for register REGNUM. */ |
| 215 | |
| 216 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) memcpy ((TO), (FROM), 4); |
| 217 | |
| 218 | /* Return the GDB type object for the "standard" data type |
| 219 | of data in register N. */ |
| 220 | |
| 221 | #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int |
| 222 | |
| 223 | #endif /* No 68881. */ |
| 224 | |
| 225 | /* Initializer for an array of names of registers. |
| 226 | Entries beyond the first NUM_REGS are ignored. */ |
| 227 | |
| 228 | #define REGISTER_NAMES \ |
| 229 | {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \ |
| 230 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \ |
| 231 | "ps", "pc", \ |
| 232 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \ |
| 233 | "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" } |
| 234 | |
| 235 | /* Register numbers of various important registers. |
| 236 | Note that some of these values are "real" register numbers, |
| 237 | and correspond to the general registers of the machine, |
| 238 | and some are "phony" register numbers which are too large |
| 239 | to be actual register numbers as far as the user is concerned |
| 240 | but do serve to get the desired values when passed to read_register. */ |
| 241 | |
| 242 | #define A1_REGNUM 9 |
| 243 | #define FP_REGNUM 14 /* Contains address of executing stack frame */ |
| 244 | #define SP_REGNUM 15 /* Contains address of top of stack */ |
| 245 | #define PS_REGNUM 16 /* Contains processor status */ |
| 246 | #define PC_REGNUM 17 /* Contains program counter */ |
| 247 | #if defined (HAVE_68881) |
| 248 | #define FP0_REGNUM 18 /* Floating point register 0 */ |
| 249 | #define FPC_REGNUM 26 /* 68881 control register */ |
| 250 | #define FPS_REGNUM 27 /* 68881 status register */ |
| 251 | #define FPI_REGNUM 28 /* 68881 iaddr register */ |
| 252 | #endif /* 68881. */ |
| 253 | |
| 254 | /* Store the address of the place in which to copy the structure the |
| 255 | subroutine will return. This is called from call_function. */ |
| 256 | |
| 257 | #define STORE_STRUCT_RETURN(ADDR, SP) \ |
| 258 | { write_register (A1_REGNUM, (ADDR)); } |
| 259 | |
| 260 | /* Extract from an array REGBUF containing the (raw) register state |
| 261 | a function return value of type TYPE, and copy that, in virtual format, |
| 262 | into VALBUF. This is assuming that floating point values are returned |
| 263 | as doubles in d0/d1. */ |
| 264 | |
| 265 | #if !defined (EXTRACT_RETURN_VALUE) |
| 266 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
| 267 | memcpy ((VALBUF), \ |
| 268 | (char *)(REGBUF) + \ |
| 269 | (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \ |
| 270 | TYPE_LENGTH(TYPE)) |
| 271 | #endif |
| 272 | |
| 273 | /* Write into appropriate registers a function return value |
| 274 | of type TYPE, given in virtual format. Assumes floats are passed |
| 275 | in d0/d1. */ |
| 276 | |
| 277 | #if !defined (STORE_RETURN_VALUE) |
| 278 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
| 279 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) |
| 280 | #endif |
| 281 | |
| 282 | /* Extract from an array REGBUF containing the (raw) register state |
| 283 | the address in which a function should return its structure value, |
| 284 | as a CORE_ADDR (or an expression that can be used as one). */ |
| 285 | |
| 286 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) |
| 287 | \f |
| 288 | /* Describe the pointer in each stack frame to the previous stack frame |
| 289 | (its caller). */ |
| 290 | |
| 291 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's |
| 292 | chain-pointer. |
| 293 | In the case of the 68000, the frame's nominal address |
| 294 | is the address of a 4-byte word containing the calling frame's address. */ |
| 295 | |
| 296 | #define FRAME_CHAIN(thisframe) \ |
| 297 | (!inside_entry_file ((thisframe)->pc) ? \ |
| 298 | read_memory_integer ((thisframe)->frame, 4) :\ |
| 299 | 0) |
| 300 | |
| 301 | /* Define other aspects of the stack frame. */ |
| 302 | |
| 303 | /* A macro that tells us whether the function invocation represented |
| 304 | by FI does not have a frame on the stack associated with it. If it |
| 305 | does not, FRAMELESS is set to 1, else 0. */ |
| 306 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ |
| 307 | (FRAMELESS) = frameless_look_for_prologue(FI) |
| 308 | |
| 309 | #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4)) |
| 310 | |
| 311 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) |
| 312 | |
| 313 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) |
| 314 | |
| 315 | /* Set VAL to the number of args passed to frame described by FI. |
| 316 | Can set VAL to -1, meaning no way to tell. */ |
| 317 | |
| 318 | /* We can't tell how many args there are |
| 319 | now that the C compiler delays popping them. */ |
| 320 | #if !defined (FRAME_NUM_ARGS) |
| 321 | #define FRAME_NUM_ARGS(val,fi) (val = -1) |
| 322 | #endif |
| 323 | |
| 324 | /* Return number of bytes at start of arglist that are not really args. */ |
| 325 | |
| 326 | #define FRAME_ARGS_SKIP 8 |
| 327 | |
| 328 | /* Put here the code to store, into a struct frame_saved_regs, |
| 329 | the addresses of the saved registers of frame described by FRAME_INFO. |
| 330 | This includes special registers such as pc and fp saved in special |
| 331 | ways in the stack frame. sp is even more special: |
| 332 | the address we return for it IS the sp for the next frame. */ |
| 333 | |
| 334 | #if !defined (FRAME_FIND_SAVED_REGS) |
| 335 | #if defined (HAVE_68881) |
| 336 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
| 337 | { register int regnum; \ |
| 338 | register int regmask; \ |
| 339 | register CORE_ADDR next_addr; \ |
| 340 | register CORE_ADDR pc; \ |
| 341 | int nextinsn; \ |
| 342 | bzero (&frame_saved_regs, sizeof frame_saved_regs); \ |
| 343 | if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \ |
| 344 | && (frame_info)->pc <= (frame_info)->frame) \ |
| 345 | { next_addr = (frame_info)->frame; \ |
| 346 | pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\ |
| 347 | else \ |
| 348 | { pc = get_pc_function_start ((frame_info)->pc); \ |
| 349 | /* Verify we have a link a6 instruction next; \ |
| 350 | if not we lose. If we win, find the address above the saved \ |
| 351 | regs using the amount of storage from the link instruction. */\ |
| 352 | if (044016 == read_memory_integer (pc, 2)) \ |
| 353 | next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \ |
| 354 | else if (047126 == read_memory_integer (pc, 2)) \ |
| 355 | next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \ |
| 356 | else goto lose; \ |
| 357 | /* If have an addal #-n, sp next, adjust next_addr. */ \ |
| 358 | if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \ |
| 359 | next_addr += read_memory_integer (pc += 2, 4), pc += 4; \ |
| 360 | } \ |
| 361 | /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \ |
| 362 | regmask = read_memory_integer (pc + 2, 2); \ |
| 363 | /* But before that can come an fmovem. Check for it. */ \ |
| 364 | nextinsn = 0xffff & read_memory_integer (pc, 2); \ |
| 365 | if (0xf227 == nextinsn \ |
| 366 | && (regmask & 0xff00) == 0xe000) \ |
| 367 | { pc += 4; /* Regmask's low bit is for register fp7, the first pushed */ \ |
| 368 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1) \ |
| 369 | if (regmask & 1) \ |
| 370 | (frame_saved_regs).regs[regnum] = (next_addr -= 12); \ |
| 371 | regmask = read_memory_integer (pc + 2, 2); } \ |
| 372 | if (0044327 == read_memory_integer (pc, 2)) \ |
| 373 | { pc += 4; /* Regmask's low bit is for register 0, the first written */ \ |
| 374 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \ |
| 375 | if (regmask & 1) \ |
| 376 | (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; } \ |
| 377 | else if (0044347 == read_memory_integer (pc, 2)) \ |
| 378 | { pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \ |
| 379 | for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \ |
| 380 | if (regmask & 1) \ |
| 381 | (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \ |
| 382 | else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2))) \ |
| 383 | { regnum = 0xf & read_memory_integer (pc, 2); pc += 2; \ |
| 384 | (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \ |
| 385 | /* fmovemx to index of sp may follow. */ \ |
| 386 | regmask = read_memory_integer (pc + 2, 2); \ |
| 387 | nextinsn = 0xffff & read_memory_integer (pc, 2); \ |
| 388 | if (0xf236 == nextinsn \ |
| 389 | && (regmask & 0xff00) == 0xf000) \ |
| 390 | { pc += 10; /* Regmask's low bit is for register fp0, the first written */ \ |
| 391 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1) \ |
| 392 | if (regmask & 1) \ |
| 393 | (frame_saved_regs).regs[regnum] = (next_addr += 12) - 12; \ |
| 394 | regmask = read_memory_integer (pc + 2, 2); } \ |
| 395 | /* clrw -(sp); movw ccr,-(sp) may follow. */ \ |
| 396 | if (0x426742e7 == read_memory_integer (pc, 4)) \ |
| 397 | (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \ |
| 398 | lose: ; \ |
| 399 | (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \ |
| 400 | (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \ |
| 401 | (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \ |
| 402 | } |
| 403 | #else /* no 68881. */ |
| 404 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
| 405 | { register int regnum; \ |
| 406 | register int regmask; \ |
| 407 | register CORE_ADDR next_addr; \ |
| 408 | register CORE_ADDR pc; \ |
| 409 | bzero (&frame_saved_regs, sizeof frame_saved_regs); \ |
| 410 | if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 4 \ |
| 411 | && (frame_info)->pc <= (frame_info)->frame) \ |
| 412 | { next_addr = (frame_info)->frame; \ |
| 413 | pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4; }\ |
| 414 | else \ |
| 415 | { pc = get_pc_function_start ((frame_info)->pc); \ |
| 416 | /* Verify we have a link a6 instruction next; \ |
| 417 | if not we lose. If we win, find the address above the saved \ |
| 418 | regs using the amount of storage from the link instruction. */\ |
| 419 | if (044016 == read_memory_integer (pc, 2)) \ |
| 420 | next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \ |
| 421 | else if (047126 == read_memory_integer (pc, 2)) \ |
| 422 | next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \ |
| 423 | else goto lose; \ |
| 424 | /* If have an addal #-n, sp next, adjust next_addr. */ \ |
| 425 | if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \ |
| 426 | next_addr += read_memory_integer (pc += 2, 4), pc += 4; \ |
| 427 | } \ |
| 428 | /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \ |
| 429 | regmask = read_memory_integer (pc + 2, 2); \ |
| 430 | if (0044327 == read_memory_integer (pc, 2)) \ |
| 431 | { pc += 4; /* Regmask's low bit is for register 0, the first written */ \ |
| 432 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \ |
| 433 | if (regmask & 1) \ |
| 434 | (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; } \ |
| 435 | else if (0044347 == read_memory_integer (pc, 2)) \ |
| 436 | { pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \ |
| 437 | for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \ |
| 438 | if (regmask & 1) \ |
| 439 | (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \ |
| 440 | else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2))) \ |
| 441 | { regnum = 0xf & read_memory_integer (pc, 2); pc += 2; \ |
| 442 | (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \ |
| 443 | /* clrw -(sp); movw ccr,-(sp) may follow. */ \ |
| 444 | if (0x426742e7 == read_memory_integer (pc, 4)) \ |
| 445 | (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \ |
| 446 | lose: ; \ |
| 447 | (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \ |
| 448 | (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \ |
| 449 | (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \ |
| 450 | } |
| 451 | #endif /* no 68881. */ |
| 452 | #endif /* no FIND_FRAME_SAVED_REGS. */ |
| 453 | |
| 454 | \f |
| 455 | /* Things needed for making the inferior call functions. |
| 456 | It seems like every m68k based machine has almost identical definitions |
| 457 | in the individual machine's configuration files. Most other cpu types |
| 458 | (mips, i386, etc) have routines in their *-tdep.c files to handle this |
| 459 | for most configurations. The m68k family should be able to do this as |
| 460 | well. These macros can still be overridden when necessary. */ |
| 461 | |
| 462 | /* The CALL_DUMMY macro is the sequence of instructions, as disassembled |
| 463 | by gdb itself: |
| 464 | |
| 465 | fmovemx fp0-fp7,sp@- 0xf227 0xe0ff |
| 466 | moveml d0-a5,sp@- 0x48e7 0xfffc |
| 467 | clrw sp@- 0x4267 |
| 468 | movew ccr,sp@- 0x42e7 |
| 469 | |
| 470 | /..* The arguments are pushed at this point by GDB; |
| 471 | no code is needed in the dummy for this. |
| 472 | The CALL_DUMMY_START_OFFSET gives the position of |
| 473 | the following jsr instruction. *../ |
| 474 | |
| 475 | jsr @#0x32323232 0x4eb9 0x3232 0x3232 |
| 476 | addal #0x69696969,sp 0xdffc 0x6969 0x6969 |
| 477 | trap #<your BPT_VECTOR number here> 0x4e4? |
| 478 | nop 0x4e71 |
| 479 | |
| 480 | Note this is CALL_DUMMY_LENGTH bytes (28 for the above example). |
| 481 | We actually start executing at the jsr, since the pushing of the |
| 482 | registers is done by PUSH_DUMMY_FRAME. If this were real code, |
| 483 | the arguments for the function called by the jsr would be pushed |
| 484 | between the moveml and the jsr, and we could allow it to execute through. |
| 485 | But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is |
| 486 | done, and we cannot allow the moveml to push the registers again lest |
| 487 | they be taken for the arguments. */ |
| 488 | |
| 489 | #if defined (HAVE_68881) |
| 490 | |
| 491 | #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))} |
| 492 | #define CALL_DUMMY_LENGTH 28 /* Size of CALL_DUMMY */ |
| 493 | #define CALL_DUMMY_START_OFFSET 12 /* Offset to jsr instruction*/ |
| 494 | |
| 495 | #else |
| 496 | |
| 497 | #define CALL_DUMMY {0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))} |
| 498 | #define CALL_DUMMY_LENGTH 24 /* Size of CALL_DUMMY */ |
| 499 | #define CALL_DUMMY_START_OFFSET 8 /* Offset to jsr instruction*/ |
| 500 | |
| 501 | #endif /* HAVE_68881 */ |
| 502 | |
| 503 | /* Insert the specified number of args and function address |
| 504 | into a call sequence of the above form stored at DUMMYNAME. |
| 505 | We use the BFD routines to store a big-endian value of known size. */ |
| 506 | |
| 507 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ |
| 508 | { _do_putb32 (fun, (char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \ |
| 509 | _do_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); } |
| 510 | |
| 511 | /* Push an empty stack frame, to record the current PC, etc. */ |
| 512 | |
| 513 | #define PUSH_DUMMY_FRAME { m68k_push_dummy_frame (); } |
| 514 | |
| 515 | extern void m68k_push_dummy_frame PARAMS ((void)); |
| 516 | |
| 517 | extern void m68k_pop_frame PARAMS ((void)); |
| 518 | |
| 519 | /* Discard from the stack the innermost frame, restoring all registers. */ |
| 520 | |
| 521 | #define POP_FRAME { m68k_pop_frame (); } |
| 522 | |
| 523 | /* Offset from SP to first arg on stack at first instruction of a function */ |
| 524 | |
| 525 | #define SP_ARG0 (1 * 4) |