gdb/tm-i386v.h

   1 /* Macro definitions for i386, Unix System V.
   2    Copyright 1986, 1987, 1989, 1991, 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 #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 /* define this if you don't have the extension to coff that allows
  31  * file names to appear in the string table
  32  * (aux.x_file.x_foff)
  33  */
  34 #define COFF_NO_LONG_FILE_NAMES
  35
  36 /* turn this on when rest of gdb is ready */
  37 #define IEEE_FLOAT
  38
  39 /* Define this if the C compiler puts an underscore at the front
  40    of external names before giving them to the linker.  */
  41
  42 /* #define NAMES_HAVE_UNDERSCORE */
  43
  44 /* number of traps that happen between exec'ing the shell
  45  * to run an inferior, and when we finally get to
  46  * the inferior code.  This is 2 on most implementations.
  47  */
  48 #ifndef START_INFERIOR_TRAPS_EXPECTED
  49 #define START_INFERIOR_TRAPS_EXPECTED 4
  50 #endif
  51
  52 /* Offset from address of function to start of its code.
  53    Zero on most machines.  */
  54
  55 #define FUNCTION_START_OFFSET 0
  56
  57 /* Advance PC across any function entry prologue instructions
  58    to reach some "real" code.  */
  59
  60 #define SKIP_PROLOGUE(frompc)   {(frompc) = i386_skip_prologue((frompc));}
  61
  62 extern int
  63 i386_skip_prologue PARAMS ((int));
  64
  65 /* Immediately after a function call, return the saved pc.
  66    Can't always go through the frames for this because on some machines
  67    the new frame is not set up until the new function executes
  68    some instructions.  */
  69
  70 #define SAVED_PC_AFTER_CALL(frame) \
  71   (read_memory_integer (read_register (SP_REGNUM), 4))
  72
  73 /* Address of end of stack space.  */
  74
  75 #define STACK_END_ADDR 0x80000000
  76
  77 /* Stack grows downward.  */
  78
  79 #define INNER_THAN <
  80
  81 /* Sequence of bytes for breakpoint instruction.  */
  82
  83 #define BREAKPOINT {0xcc}
  84
  85 /* Amount PC must be decremented by after a breakpoint.
  86    This is often the number of bytes in BREAKPOINT
  87    but not always.  */
  88
  89 #ifndef DECR_PC_AFTER_BREAK
  90 #define DECR_PC_AFTER_BREAK 1
  91 #endif
  92
  93 /* Nonzero if instruction at PC is a return instruction.  */
  94
  95 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3)
  96
  97 /* Return 1 if P points to an invalid floating point value.
  98    LEN is the length in bytes -- not relevant on the 386.  */
  99
 100 #define INVALID_FLOAT(p, len) (0)
 101
 102 /* Say how long (ordinary) registers are.  */
 103
 104 #define REGISTER_TYPE long
 105
 106 /* Number of machine registers */
 107
 108 #define NUM_REGS 16
 109
 110 /* Initializer for an array of names of registers.
 111    There should be NUM_REGS strings in this initializer.  */
 112
 113 /* the order of the first 8 registers must match the compiler's
 114  * numbering scheme (which is the same as the 386 scheme)
 115  * also, this table must match regmap in i386-pinsn.c.
 116  */
 117 #define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \
 118                          "esp", "ebp", "esi", "edi", \
 119                          "eip", "ps", "cs", "ss", \
 120                          "ds", "es", "fs", "gs", \
 121                          }
 122
 123 /* Register numbers of various important registers.
 124    Note that some of these values are "real" register numbers,
 125    and correspond to the general registers of the machine,
 126    and some are "phony" register numbers which are too large
 127    to be actual register numbers as far as the user is concerned
 128    but do serve to get the desired values when passed to read_register.  */
 129
 130 #define FP_REGNUM 5             /* Contains address of executing stack frame */
 131 #define SP_REGNUM 4             /* Contains address of top of stack */
 132
 133 #define PC_REGNUM 8
 134 #define PS_REGNUM 9
 135
 136 /* Total amount of space needed to store our copies of the machine's
 137    register state, the array `registers'.  */
 138 #define REGISTER_BYTES (NUM_REGS * 4)
 139
 140 /* Index within `registers' of the first byte of the space for
 141    register N.  */
 142
 143 #define REGISTER_BYTE(N) ((N)*4)
 144
 145 /* Number of bytes of storage in the actual machine representation
 146    for register N.  */
 147
 148 #define REGISTER_RAW_SIZE(N) (4)
 149
 150 /* Number of bytes of storage in the program's representation
 151    for register N. */
 152
 153 #define REGISTER_VIRTUAL_SIZE(N) (4)
 154
 155 /* Largest value REGISTER_RAW_SIZE can have.  */
 156
 157 #define MAX_REGISTER_RAW_SIZE 4
 158
 159 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 160
 161 #define MAX_REGISTER_VIRTUAL_SIZE 4
 162
 163 /* Nonzero if register N requires conversion
 164    from raw format to virtual format.  */
 165
 166 #define REGISTER_CONVERTIBLE(N) (0)
 167
 168 /* Convert data from raw format for register REGNUM
 169    to virtual format for register REGNUM.  */
 170
 171 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 172   {memcpy ((TO), (FROM), 4);}
 173
 174 /* Convert data from virtual format for register REGNUM
 175    to raw format for register REGNUM.  */
 176
 177 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 178   {memcpy ((TO), (FROM), 4);}
 179
 180 /* Return the GDB type object for the "standard" data type
 181    of data in register N.  */
 182 /* Perhaps si and di should go here, but potentially they could be
 183    used for things other than address.  */
 184 #define REGISTER_VIRTUAL_TYPE(N) \
 185   ((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM ?         \
 186    lookup_pointer_type (builtin_type_void) : builtin_type_int)
 187
 188 /* Store the address of the place in which to copy the structure the
 189    subroutine will return.  This is called from call_function. */
 190
 191 #define STORE_STRUCT_RETURN(ADDR, SP) \
 192   { (SP) -= sizeof (ADDR);              \
 193     write_memory ((SP), (char *) &(ADDR), sizeof (ADDR)); }
 194
 195 /* Extract from an array REGBUF containing the (raw) register state
 196    a function return value of type TYPE, and copy that, in virtual format,
 197    into VALBUF.  */
 198
 199 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 200   memcpy ((VALBUF), (REGBUF), TYPE_LENGTH (TYPE))
 201
 202 /* Write into appropriate registers a function return value
 203    of type TYPE, given in virtual format.  */
 204
 205 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 206   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 207
 208 /* Extract from an array REGBUF containing the (raw) register state
 209    the address in which a function should return its structure value,
 210    as a CORE_ADDR (or an expression that can be used as one).  */
 211
 212 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 213
 214 \f
 215 /* Describe the pointer in each stack frame to the previous stack frame
 216    (its caller).  */
 217
 218 /* FRAME_CHAIN takes a frame's nominal address
 219    and produces the frame's chain-pointer. */
 220
 221 #define FRAME_CHAIN(thisframe) \
 222   (!inside_entry_file ((thisframe)->pc) ? \
 223    read_memory_integer ((thisframe)->frame, 4) :\
 224    0)
 225
 226 /* Define other aspects of the stack frame.  */
 227
 228 /* A macro that tells us whether the function invocation represented
 229    by FI does not have a frame on the stack associated with it.  If it
 230    does not, FRAMELESS is set to 1, else 0.  */
 231 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 232   (FRAMELESS) = frameless_look_for_prologue(FI)
 233
 234 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 235
 236 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 237
 238 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 239
 240 /* Return number of args passed to a frame.
 241    Can return -1, meaning no way to tell.  */
 242
 243 #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi)
 244
 245 #ifdef __STDC__         /* Forward decl's for prototypes */
 246 struct frame_info;
 247 struct frame_saved_regs;
 248 #endif
 249
 250 extern int
 251 i386_frame_num_args PARAMS ((struct frame_info *));
 252
 253 /* Return number of bytes at start of arglist that are not really args.  */
 254
 255 #define FRAME_ARGS_SKIP 8
 256
 257 /* Put here the code to store, into a struct frame_saved_regs,
 258    the addresses of the saved registers of frame described by FRAME_INFO.
 259    This includes special registers such as pc and fp saved in special
 260    ways in the stack frame.  sp is even more special:
 261    the address we return for it IS the sp for the next frame.  */
 262
 263 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 264 { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
 265
 266 extern void
 267 i386_frame_find_saved_regs PARAMS ((struct frame_info *,
 268                                     struct frame_saved_regs *));
 269
 270 \f
 271 /* Things needed for making the inferior call functions.  */
 272
 273 /* Push an empty stack frame, to record the current PC, etc.  */
 274
 275 #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); }
 276
 277 extern void
 278 i386_push_dummy_frame PARAMS ((void));
 279
 280 /* Discard from the stack the innermost frame, restoring all registers.  */
 281
 282 #define POP_FRAME  { i386_pop_frame (); }
 283
 284 extern void
 285 i386_pop_frame PARAMS ((void));
 286
 287 /* this is
 288  *   call 11223344 (32 bit relative)
 289  *   int3
 290  */
 291
 292 #define CALL_DUMMY { 0x223344e8, 0xcc11 }
 293
 294 #define CALL_DUMMY_LENGTH 8
 295
 296 #define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */
 297
 298 /* Insert the specified number of args and function address
 299    into a call sequence of the above form stored at DUMMYNAME.  */
 300
 301 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
 302 { \
 303         int from, to, delta, loc; \
 304         loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
 305         from = loc + 5; \
 306         to = (int)(fun); \
 307         delta = to - from; \
 308         *((char *)(dummyname) + 1) = (delta & 0xff); \
 309         *((char *)(dummyname) + 2) = ((delta >> 8) & 0xff); \
 310         *((char *)(dummyname) + 3) = ((delta >> 16) & 0xff); \
 311         *((char *)(dummyname) + 4) = ((delta >> 24) & 0xff); \
 312 }
 313
 314 extern void
 315 print_387_control_word PARAMS ((unsigned int));
 316
 317 extern void
 318 print_387_status_word PARAMS ((unsigned int));
 319
 320 /* Offset from SP to first arg on stack at first instruction of a function */
 321
 322 #define SP_ARG0 (1 * 4)
 323
 324 #endif  /* !defined (TM_I386V_H) */