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