gdb/config/i386/tm-i386v.h

   1 /* Macro definitions for i386, Unix System V.
   2    Copyright 1986, 1987, 1989, 1991, 1992, 1993 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 #if !defined (TM_I386V_H)
  21 #define TM_I386V_H 1
  22
  23 /*
  24  * Changes for 80386 by Pace Willisson (pace@prep.ai.mit.edu)
  25  * July 1988
  26  */
  27
  28 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
  29
  30 /* turn this on when rest of gdb is ready */
  31 #define IEEE_FLOAT
  32
  33 /* number of traps that happen between exec'ing the shell
  34  * to run an inferior, and when we finally get to
  35  * the inferior code.  This is 2 on most implementations.
  36  */
  37 #ifndef START_INFERIOR_TRAPS_EXPECTED
  38 #define START_INFERIOR_TRAPS_EXPECTED 4
  39 #endif
  40
  41 /* Offset from address of function to start of its code.
  42    Zero on most machines.  */
  43
  44 #define FUNCTION_START_OFFSET 0
  45
  46 /* Advance PC across any function entry prologue instructions
  47    to reach some "real" code.  */
  48
  49 #define SKIP_PROLOGUE(frompc)   {(frompc) = i386_skip_prologue((frompc));}
  50
  51 extern int
  52 i386_skip_prologue PARAMS ((int));
  53
  54 /* Immediately after a function call, return the saved pc.
  55    Can't always go through the frames for this because on some machines
  56    the new frame is not set up until the new function executes
  57    some instructions.  */
  58
  59 #define SAVED_PC_AFTER_CALL(frame) \
  60   (read_memory_integer (read_register (SP_REGNUM), 4))
  61
  62 /* Address of end of stack space.  */
  63
  64 #define STACK_END_ADDR 0x80000000
  65
  66 /* Stack grows downward.  */
  67
  68 #define INNER_THAN <
  69
  70 /* Sequence of bytes for breakpoint instruction.  */
  71
  72 #define BREAKPOINT {0xcc}
  73
  74 /* Amount PC must be decremented by after a breakpoint.
  75    This is often the number of bytes in BREAKPOINT
  76    but not always.  */
  77
  78 #ifndef DECR_PC_AFTER_BREAK
  79 #define DECR_PC_AFTER_BREAK 1
  80 #endif
  81
  82 /* Nonzero if instruction at PC is a return instruction.  */
  83
  84 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3)
  85
  86 /* Return 1 if P points to an invalid floating point value.
  87    LEN is the length in bytes -- not relevant on the 386.  */
  88
  89 #define INVALID_FLOAT(p, len) (0)
  90
  91 /* Say how long (ordinary) registers are.  */
  92
  93 #define REGISTER_TYPE long
  94
  95 /* Number of machine registers */
  96
  97 #define NUM_REGS 16
  98
  99 /* Initializer for an array of names of registers.
 100    There should be NUM_REGS strings in this initializer.  */
 101
 102 /* the order of the first 8 registers must match the compiler's
 103  * numbering scheme (which is the same as the 386 scheme)
 104  * also, this table must match regmap in i386-pinsn.c.
 105  */
 106 #define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \
 107                          "esp", "ebp", "esi", "edi", \
 108                          "eip", "ps", "cs", "ss", \
 109                          "ds", "es", "fs", "gs", \
 110                          }
 111
 112 /* Register numbers of various important registers.
 113    Note that some of these values are "real" register numbers,
 114    and correspond to the general registers of the machine,
 115    and some are "phony" register numbers which are too large
 116    to be actual register numbers as far as the user is concerned
 117    but do serve to get the desired values when passed to read_register.  */
 118
 119 #define FP_REGNUM 5             /* Contains address of executing stack frame */
 120 #define SP_REGNUM 4             /* Contains address of top of stack */
 121
 122 #define PC_REGNUM 8
 123 #define PS_REGNUM 9
 124
 125 /* Total amount of space needed to store our copies of the machine's
 126    register state, the array `registers'.  */
 127 #define REGISTER_BYTES (NUM_REGS * 4)
 128
 129 /* Index within `registers' of the first byte of the space for
 130    register N.  */
 131
 132 #define REGISTER_BYTE(N) ((N)*4)
 133
 134 /* Number of bytes of storage in the actual machine representation
 135    for register N.  */
 136
 137 #define REGISTER_RAW_SIZE(N) (4)
 138
 139 /* Number of bytes of storage in the program's representation
 140    for register N. */
 141
 142 #define REGISTER_VIRTUAL_SIZE(N) (4)
 143
 144 /* Largest value REGISTER_RAW_SIZE can have.  */
 145
 146 #define MAX_REGISTER_RAW_SIZE 4
 147
 148 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 149
 150 #define MAX_REGISTER_VIRTUAL_SIZE 4
 151
 152 /* Nonzero if register N requires conversion
 153    from raw format to virtual format.  */
 154
 155 #define REGISTER_CONVERTIBLE(N) (0)
 156
 157 /* Convert data from raw format for register REGNUM
 158    to virtual format for register REGNUM.  */
 159
 160 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 161   {memcpy ((TO), (FROM), 4);}
 162
 163 /* Convert data from virtual format for register REGNUM
 164    to raw format for register REGNUM.  */
 165
 166 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 167   {memcpy ((TO), (FROM), 4);}
 168
 169 /* Return the GDB type object for the "standard" data type
 170    of data in register N.  */
 171 /* Perhaps si and di should go here, but potentially they could be
 172    used for things other than address.  */
 173 #define REGISTER_VIRTUAL_TYPE(N) \
 174   ((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM ?         \
 175    lookup_pointer_type (builtin_type_void) : builtin_type_int)
 176
 177 /* Store the address of the place in which to copy the structure the
 178    subroutine will return.  This is called from call_function. */
 179
 180 #define STORE_STRUCT_RETURN(ADDR, SP) \
 181   { (SP) -= sizeof (ADDR);              \
 182     write_memory ((SP), (char *) &(ADDR), sizeof (ADDR)); }
 183
 184 /* Extract from an array REGBUF containing the (raw) register state
 185    a function return value of type TYPE, and copy that, in virtual format,
 186    into VALBUF.  */
 187
 188 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 189   memcpy ((VALBUF), (REGBUF), TYPE_LENGTH (TYPE))
 190
 191 /* Write into appropriate registers a function return value
 192    of type TYPE, given in virtual format.  */
 193
 194 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 195   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 196
 197 /* Extract from an array REGBUF containing the (raw) register state
 198    the address in which a function should return its structure value,
 199    as a CORE_ADDR (or an expression that can be used as one).  */
 200
 201 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 202
 203 \f
 204 /* Describe the pointer in each stack frame to the previous stack frame
 205    (its caller).  */
 206
 207 /* FRAME_CHAIN takes a frame's nominal address
 208    and produces the frame's chain-pointer. */
 209
 210 #define FRAME_CHAIN(thisframe) \
 211   (!inside_entry_file ((thisframe)->pc) ? \
 212    read_memory_integer ((thisframe)->frame, 4) :\
 213    0)
 214
 215 /* Define other aspects of the stack frame.  */
 216
 217 /* A macro that tells us whether the function invocation represented
 218    by FI does not have a frame on the stack associated with it.  If it
 219    does not, FRAMELESS is set to 1, else 0.  */
 220 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 221   (FRAMELESS) = frameless_look_for_prologue(FI)
 222
 223 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 224
 225 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 226
 227 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 228
 229 /* Return number of args passed to a frame.
 230    Can return -1, meaning no way to tell.  */
 231
 232 #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi)
 233
 234 #ifdef __STDC__         /* Forward decl's for prototypes */
 235 struct frame_info;
 236 struct frame_saved_regs;
 237 #endif
 238
 239 extern int
 240 i386_frame_num_args PARAMS ((struct frame_info *));
 241
 242 /* Return number of bytes at start of arglist that are not really args.  */
 243
 244 #define FRAME_ARGS_SKIP 8
 245
 246 /* Put here the code to store, into a struct frame_saved_regs,
 247    the addresses of the saved registers of frame described by FRAME_INFO.
 248    This includes special registers such as pc and fp saved in special
 249    ways in the stack frame.  sp is even more special:
 250    the address we return for it IS the sp for the next frame.  */
 251
 252 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 253 { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
 254
 255 extern void
 256 i386_frame_find_saved_regs PARAMS ((struct frame_info *,
 257                                     struct frame_saved_regs *));
 258
 259 \f
 260 /* Things needed for making the inferior call functions.  */
 261
 262 /* Push an empty stack frame, to record the current PC, etc.  */
 263
 264 #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); }
 265
 266 extern void
 267 i386_push_dummy_frame PARAMS ((void));
 268
 269 /* Discard from the stack the innermost frame, restoring all registers.  */
 270
 271 #define POP_FRAME  { i386_pop_frame (); }
 272
 273 extern void
 274 i386_pop_frame PARAMS ((void));
 275
 276 /* this is
 277  *   call 11223344 (32 bit relative)
 278  *   int3
 279  */
 280
 281 #define CALL_DUMMY { 0x223344e8, 0xcc11 }
 282
 283 #define CALL_DUMMY_LENGTH 8
 284
 285 #define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */
 286
 287 /* Insert the specified number of args and function address
 288    into a call sequence of the above form stored at DUMMYNAME.  */
 289
 290 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
 291 { \
 292         int from, to, delta, loc; \
 293         loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
 294         from = loc + 5; \
 295         to = (int)(fun); \
 296         delta = to - from; \
 297         *((char *)(dummyname) + 1) = (delta & 0xff); \
 298         *((char *)(dummyname) + 2) = ((delta >> 8) & 0xff); \
 299         *((char *)(dummyname) + 3) = ((delta >> 16) & 0xff); \
 300         *((char *)(dummyname) + 4) = ((delta >> 24) & 0xff); \
 301 }
 302
 303 extern void
 304 print_387_control_word PARAMS ((unsigned int));
 305
 306 extern void
 307 print_387_status_word PARAMS ((unsigned int));
 308
 309 /* Offset from SP to first arg on stack at first instruction of a function */
 310
 311 #define SP_ARG0 (1 * 4)
 312
 313 #endif  /* !defined (TM_I386V_H) */