gdb/tm-i386v4.h

   1 /* Macro definitions for GDB on an Intel i386 running SVR4.
   2    Copyright (C) 1991, Free Software Foundation, Inc.
   3    Written by Fred Fish at Cygnus Support (fnf@cygint)
   4
   5 This file is part of GDB.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* Use the alternate method of determining valid frame chains. */
  22
  23 #define FRAME_CHAIN_VALID_ALTERNATE
  24
  25 /* number of traps that happen between exec'ing the shell
  26  * to run an inferior, and when we finally get to
  27  * the inferior code.  This is 2 on most implementations.
  28  */
  29 #define START_INFERIOR_TRAPS_EXPECTED 2
  30
  31 /* Pick up most of what we need from the generic i386 target include file. */
  32
  33 #include "tm-i386v.h"
  34
  35 /* Pick up more stuff from the generic SVR4 host include file. */
  36
  37 #include "tm-sysv4.h"
  38
  39 /* We can't tell how many args there are
  40    now that the C compiler delays popping them.  */
  41
  42 #undef FRAME_NUM_ARGS
  43 #define FRAME_NUM_ARGS(val,fi) (val = -1)
  44
  45 /* Offsets (in target ints) into jmp_buf.  Not defined in any system header
  46    file, so we have to step through setjmp/longjmp with a debugger and figure
  47    them out.  Note that <setjmp> defines _JBLEN as 10, which is the default
  48    if no specific machine is selected, even though we only use 6 slots. */
  49
  50 #define JB_ELEMENT_SIZE sizeof(int)     /* jmp_buf[_JBLEN] is array of ints */
  51
  52 #define JB_EBX  0
  53 #define JB_ESI  1
  54 #define JB_EDI  2
  55 #define JB_EBP  3
  56 #define JB_ESP  4
  57 #define JB_EDX  5
  58
  59 #define JB_PC   JB_EDX  /* Setjmp()'s return PC saved in EDX */
  60
  61 /* Figure out where the longjmp will land.  Slurp the args out of the stack.
  62    We expect the first arg to be a pointer to the jmp_buf structure from which
  63    we extract the pc (JB_PC) that we will land at.  The pc is copied into ADDR.
  64    This routine returns true on success */
  65
  66 extern int
  67 get_longjmp_target PARAMS ((CORE_ADDR *));
  68
  69 #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)