gdb/config/i386/tm-symmetry.h

   1 /* Target machine definitions for GDB on a Sequent Symmetry under dynix 3.0,
   2    with Weitek 1167 and i387 support.
   3    Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
   4    Symmetry version by Jay Vosburgh (uunet!sequent!fubar).
   5
   6 This file is part of GDB.
   7
   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.
  12
  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.
  17
  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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22 /* I don't know if this will work for cross-debugging, even if you do get
  23    a copy of the right include file.  */
  24 #include <machine/reg.h>
  25
  26 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
  27
  28 /* Offset from address of function to start of its code.
  29    Zero on most machines.  */
  30
  31 #define FUNCTION_START_OFFSET 0
  32
  33 /* Advance PC across any function entry prologue instructions
  34    to reach some "real" code.  From m-i386.h */
  35
  36 #define SKIP_PROLOGUE(frompc)   {(frompc) = i386_skip_prologue((frompc));}
  37
  38 extern int
  39 i386_skip_prologue PARAMS ((int));
  40
  41 /* Immediately after a function call, return the saved pc.
  42    Can't always go through the frames for this because on some machines
  43    the new frame is not set up until the new function executes
  44    some instructions.  */
  45
  46 #define SAVED_PC_AFTER_CALL(frame) \
  47   read_memory_integer(read_register(SP_REGNUM), 4)
  48
  49 /* I don't know the real values for these.  */
  50 #define TARGET_UPAGES UPAGES
  51 #define TARGET_NBPG NBPG
  52
  53 /* Address of end of stack space.  */
  54
  55 #define STACK_END_ADDR (0x40000000 - (TARGET_UPAGES * TARGET_NBPG))
  56
  57 /* Stack grows downward.  */
  58
  59 #define INNER_THAN <
  60
  61 /* Sequence of bytes for breakpoint instruction.  */
  62
  63 #define BREAKPOINT {0xcc}
  64
  65 /* Amount PC must be decremented by after a breakpoint.
  66    This is often the number of bytes in BREAKPOINT
  67    but not always.  */
  68
  69 #define DECR_PC_AFTER_BREAK 0
  70
  71 /* Nonzero if instruction at PC is a return instruction.  */
  72 /* For Symmetry, this is really the 'leave' instruction, which */
  73 /* is right before the ret */
  74
  75 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc9)
  76
  77 /* Return 1 if P points to an invalid floating point value.
  78 */
  79
  80 #define INVALID_FLOAT(p, len) (0)
  81
  82 #if 0
  83  --- this code can't be used unless we know we are running native,
  84      since it uses host specific ptrace calls.
  85 /* code for 80387 fpu.  Functions are from i386-dep.c, copied into
  86  * symm-dep.c.
  87  */
  88 #define FLOAT_INFO { i386_float_info(); }
  89 #endif
  90
  91 /* Say how long (ordinary) registers are.  */
  92
  93 #define REGISTER_TYPE long
  94
  95 /* Number of machine registers */
  96 #define NUM_REGS 49
  97
  98 /* Initializer for an array of names of registers.
  99    There should be NUM_REGS strings in this initializer.  */
 100
 101 /* Symmetry registers are in this weird order to match the register
 102    numbers in the symbol table entries.  If you change the order,
 103    things will probably break mysteriously for no apparent reason.
 104    Also note that the st(0)...st(7) 387 registers are represented as
 105    st0...st7.  */
 106
 107 #define REGISTER_NAMES { "eax", "edx", "ecx", "st0", "st1", \
 108                              "ebx", "esi", "edi", "st2", "st3", \
 109                              "st4", "st5", "st6", "st7", "esp", \
 110                              "ebp", "eip", "eflags", "fp1", "fp2", \
 111                              "fp3", "fp4", "fp5", "fp6", "fp7", \
 112                              "fp8", "fp9", "fp10", "fp11", "fp12", \
 113                              "fp13", "fp14", "fp15", "fp16", "fp17", \
 114                              "fp18", "fp19", "fp20", "fp21", "fp22", \
 115                              "fp23", "fp24", "fp25", "fp26", "fp27", \
 116                              "fp28", "fp29", "fp30", "fp31" }
 117
 118 /* Register numbers of various important registers.
 119    Note that some of these values are "real" register numbers,
 120    and correspond to the general registers of the machine,
 121    and some are "phony" register numbers which are too large
 122    to be actual register numbers as far as the user is concerned
 123    but do serve to get the desired values when passed to read_register.  */
 124
 125 #define FP1_REGNUM 18           /* first 1167 register */
 126 #define SP_REGNUM 14            /* Contains address of top of stack */
 127 #define FP_REGNUM 15            /* Contains address of executing stack frame */
 128 #define PC_REGNUM 16            /* Contains program counter */
 129 #define PS_REGNUM 17            /* Contains processor status */
 130
 131 /* Total amount of space needed to store our copies of the machine's
 132    register state, the array `registers'.  */
 133 /* 10 i386 registers, 8 i387 registers, and 31 Weitek 1167 registers */
 134 #define REGISTER_BYTES ((10 * 4) + (8 * 10) + (31 * 4))
 135
 136 /* Index within `registers' of the first byte of the space for
 137    register N.  */
 138
 139 #define REGISTER_BYTE(N)                \
 140 ((N < 3) ? (N * 4) :                    \
 141 (N < 5) ? (((N - 2) * 10) + 2) :        \
 142 (N < 8) ? (((N - 5) * 4) + 32) :        \
 143 (N < 14) ? (((N - 8) * 10) + 44) :      \
 144     (((N - 14) * 4) + 104))
 145
 146 /* Number of bytes of storage in the actual machine representation
 147  * for register N.  All registers are 4 bytes, except 387 st(0) - st(7),
 148  * which are 80 bits each.
 149  */
 150
 151 #define REGISTER_RAW_SIZE(N) \
 152 ((N < 3) ? 4 :  \
 153 (N < 5) ? 10 :  \
 154 (N < 8) ? 4 :   \
 155 (N < 14) ? 10 : \
 156     4)
 157
 158 /* Number of bytes of storage in the program's representation
 159    for register N.  On the vax, all regs are 4 bytes.  */
 160
 161 #define REGISTER_VIRTUAL_SIZE(N) 4
 162
 163 /* Largest value REGISTER_RAW_SIZE can have.  */
 164
 165 #define MAX_REGISTER_RAW_SIZE 10
 166
 167 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 168
 169 #define MAX_REGISTER_VIRTUAL_SIZE 4
 170
 171 /* Nonzero if register N requires conversion
 172    from raw format to virtual format.  */
 173
 174 #define REGISTER_CONVERTIBLE(N) \
 175 ((N < 3) ? 0 : \
 176 (N < 5) ? 1  : \
 177 (N < 8) ? 0  : \
 178 (N < 14) ? 1 : \
 179     0)
 180
 181 /* Convert data from raw format for register REGNUM
 182    to virtual format for register REGNUM.  */
 183
 184 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
 185 ((REGNUM < 3) ? bcopy ((FROM), (TO), 4) : \
 186 (REGNUM < 5) ? i387_to_double((FROM), (TO)) : \
 187 (REGNUM < 8) ? bcopy ((FROM), (TO), 4) : \
 188 (REGNUM < 14) ? i387_to_double((FROM), (TO)) : \
 189     bcopy ((FROM), (TO), 4))
 190
 191 extern void
 192 i387_to_double PARAMS ((char *, char *));
 193
 194 /* Convert data from virtual format for register REGNUM
 195    to raw format for register REGNUM.  */
 196
 197 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 198 ((REGNUM < 3) ? bcopy ((FROM), (TO), 4) : \
 199 (REGNUM < 5) ? double_to_i387((FROM), (TO)) : \
 200 (REGNUM < 8) ? bcopy ((FROM), (TO), 4) : \
 201 (REGNUM < 14) ? double_to_i387((FROM), (TO)) : \
 202     bcopy ((FROM), (TO), 4))
 203
 204 extern void
 205 double_to_i387 PARAMS ((char *, char *));
 206
 207 /* Return the GDB type object for the "standard" data type
 208    of data in register N.  */
 209
 210 #define REGISTER_VIRTUAL_TYPE(N) \
 211 ((N < 3) ? builtin_type_int : \
 212 (N < 5) ? builtin_type_double : \
 213 (N < 8) ? builtin_type_int : \
 214 (N < 14) ? builtin_type_double : \
 215     builtin_type_int)
 216
 217 /* from m-i386.h */
 218 /* Store the address of the place in which to copy the structure the
 219    subroutine will return.  This is called from call_function. */
 220
 221 #define STORE_STRUCT_RETURN(ADDR, SP) \
 222   { (SP) -= sizeof (ADDR);              \
 223     write_memory ((SP), &(ADDR), sizeof (ADDR)); \
 224     write_register(0, (ADDR)); }
 225
 226 /* Extract from an array REGBUF containing the (raw) register state
 227    a function return value of type TYPE, and copy that, in virtual format,
 228    into VALBUF.  */
 229
 230 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 231   symmetry_extract_return_value(TYPE, REGBUF, VALBUF)
 232
 233 /* Write into appropriate registers a function return value
 234    of type TYPE, given in virtual format.  */
 235
 236 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 237   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 238
 239 /* Extract from an array REGBUF containing the (raw) register state
 240    the address in which a function should return its structure value,
 241    as a CORE_ADDR (or an expression that can be used as one).  */
 242
 243 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 244
 245 \f
 246 /* Describe the pointer in each stack frame to the previous stack frame
 247    (its caller).  */
 248
 249 /* FRAME_CHAIN takes a frame's nominal address
 250    and produces the frame's chain-pointer.
 251
 252    However, if FRAME_CHAIN_VALID returns zero,
 253    it means the given frame is the outermost one and has no caller.  */
 254
 255 /* On Symmetry, %ebp points to caller's %ebp, and the return address
 256    is right on top of that.  */
 257
 258 #define FRAME_CHAIN(thisframe)  \
 259   (!inside_entry_file ((thisframe)->pc) ? \
 260    read_memory_integer((thisframe)->frame, 4) :\
 261    0)
 262
 263 #define FRAME_CHAIN_VALID(chain, thisframe) \
 264   (chain != 0)
 265
 266 /* Define other aspects of the stack frame.  */
 267
 268 /* A macro that tells us whether the function invocation represented
 269    by FI does not have a frame on the stack associated with it.  If it
 270    does not, FRAMELESS is set to 1, else 0.  */
 271 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 272   (FRAMELESS) = frameless_look_for_prologue(FI)
 273
 274 #define FRAME_SAVED_PC(fi) (read_memory_integer((fi)->frame + 4, 4))
 275
 276 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 277
 278 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 279
 280 /* Return number of args passed to a frame.
 281    Can return -1, meaning no way to tell.
 282
 283    The weirdness in the "addl $imm8" case is due to gcc sometimes
 284    issuing "addl $-int" after function call returns; this would
 285    produce ridiculously huge arg counts.  */
 286
 287 #define FRAME_NUM_ARGS(numargs, fi)  \
 288 { \
 289   int op = read_memory_integer(FRAME_SAVED_PC((fi)), 4); \
 290   int narg; \
 291   if ((op & 0xff) == 0x59) /* 0x59  'popl %ecx' */ \
 292     { \
 293       numargs = 1; \
 294     } \
 295   else if ((op & 0xffff) == 0xc483) /* 0xc483 'addl $imm8' */ \
 296     { \
 297       narg = ((op >> 16) & 0xff); \
 298       numargs = (narg >= 128) ? -1 : narg / 4; \
 299     } \
 300   else if ((op & 0xffff) == 0xc481) /* 0xc481 'addl $imm32' */ \
 301     { \
 302       narg = read_memory_integer(FRAME_SAVED_PC((fi))+2,4); \
 303       numargs = (narg < 0) ? -1 : narg / 4; \
 304     } \
 305   else \
 306     { \
 307       numargs = -1; \
 308     } \
 309 }
 310
 311 /* Return number of bytes at start of arglist that are not really args.  */
 312
 313 #define FRAME_ARGS_SKIP 8
 314
 315 /* Put here the code to store, into a struct frame_saved_regs,
 316    the addresses of the saved registers of frame described by FRAME_INFO.
 317    This includes special registers such as pc and fp saved in special
 318    ways in the stack frame.  sp is even more special:
 319    the address we return for it IS the sp for the next frame.  */
 320
 321 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 322 { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
 323
 324 #ifdef __STDC__         /* Forward decl's for prototypes */
 325 struct frame_info;
 326 struct frame_saved_regs;
 327 #endif
 328
 329 extern void
 330 i386_frame_find_saved_regs PARAMS ((struct frame_info *,
 331                                     struct frame_saved_regs *));
 332
 333 \f
 334 /* Things needed for making the inferior call functions.  */
 335
 336 #define PUSH_DUMMY_FRAME \
 337 {  CORE_ADDR sp = read_register (SP_REGNUM); \
 338   int regnum; \
 339   sp = push_word (sp, read_register (PC_REGNUM)); \
 340   sp = push_word (sp, read_register (FP_REGNUM)); \
 341   write_register (FP_REGNUM, sp); \
 342   for (regnum = 0; regnum < NUM_REGS; regnum++) \
 343     sp = push_word (sp, read_register (regnum)); \
 344   write_register (SP_REGNUM, sp); \
 345 }
 346
 347 #define POP_FRAME  \
 348 { \
 349   FRAME frame = get_current_frame (); \
 350   CORE_ADDR fp; \
 351   int regnum; \
 352   struct frame_saved_regs fsr; \
 353   struct frame_info *fi; \
 354   fi = get_frame_info (frame); \
 355   fp = fi->frame; \
 356   get_frame_saved_regs (fi, &fsr); \
 357   for (regnum = 0; regnum < NUM_REGS; regnum++) { \
 358       CORE_ADDR adr; \
 359       adr = fsr.regs[regnum]; \
 360       if (adr) \
 361         write_register (regnum, read_memory_integer (adr, 4)); \
 362   } \
 363   write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
 364   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
 365   write_register (SP_REGNUM, fp + 8); \
 366   flush_cached_frames (); \
 367   set_current_frame ( create_new_frame (read_register (FP_REGNUM), \
 368                                         read_pc ())); \
 369 }
 370
 371 /* from i386-dep.c, worked better than my original... */
 372 /* This sequence of words is the instructions
 373  * call (32-bit offset)
 374  * int 3
 375  * This is 6 bytes.
 376  */
 377
 378 #define CALL_DUMMY { 0x223344e8, 0xcc11 }
 379
 380 #define CALL_DUMMY_LENGTH 8
 381
 382 #define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */
 383
 384 /* Insert the specified number of args and function address
 385    into a call sequence of the above form stored at DUMMYNAME.  */
 386
 387 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
 388 { \
 389         int from, to, delta, loc; \
 390         loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
 391         from = loc + 5; \
 392         to = (int)(fun); \
 393         delta = to - from; \
 394         *(int *)((char *)(dummyname) + 1) = delta; \
 395 }
 396
 397 extern void
 398 print_387_control_word PARAMS ((unsigned int));
 399
 400 extern void
 401 print_387_status_word PARAMS ((unsigned int));