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100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
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/* Macro defintions for i386.
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Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
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This file is part of GDB.
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GDB is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GDB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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* Changes for 80386 by Pace Willisson (pace@prep.ai.mit.edu)
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* July 1988
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*/
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#define HOST_BYTE_ORDER LITTLE_ENDIAN
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/* I'm running gdb 3.4 under 386/ix 2.0.2, which is a derivative of AT&T's
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Sys V/386 3.2.
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On some machines, gdb crashes when it's starting up while calling the
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vendor's termio tgetent() routine. It always works when run under
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itself (actually, under 3.2, it's not an infinitely recursive bug.)
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After some poking around, it appears that depending on the environment
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size, or whether you're running YP, or the phase of the moon or something,
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the stack is not always long-aligned when main() is called, and tgetent()
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takes strong offense at that. On some machines this bug never appears, but
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on those where it does, it occurs quite reliably. */
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#define ALIGN_STACK_ON_STARTUP
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/* define USG if you are using sys5 /usr/include's */
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#define USG
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/* USG systems need these */
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#define vfork() fork()
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#define MAXPATHLEN 500
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#define HAVE_TERMIO
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/* Get rid of any system-imposed stack limit if possible. */
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/* #define SET_STACK_LIMIT_HUGE not in sys5 */
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/* This is the amount to subtract from u.u_ar0
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to get the offset in the core file of the register values. */
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#define KERNEL_U_ADDR 0xe0000000
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#if 0
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/* Interface definitions for kernel debugger KDB. */
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/* Map machine fault codes into signal numbers.
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First subtract 0, divide by 4, then index in a table.
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Faults for which the entry in this table is 0
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are not handled by KDB; the program's own trap handler
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gets to handle then. */
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#define FAULT_CODE_ORIGIN 0
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#define FAULT_CODE_UNITS 4
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#define FAULT_TABLE \
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{ 0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, 0, 0, 0, 0, 0}
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/* Start running with a stack stretching from BEG to END.
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BEG and END should be symbols meaningful to the assembler.
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This is used only for kdb. */
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#define INIT_STACK(beg, end) {}
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/* Push the frame pointer register on the stack. */
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#define PUSH_FRAME_PTR {}
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/* Copy the top-of-stack to the frame pointer register. */
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#define POP_FRAME_PTR {}
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/* After KDB is entered by a fault, push all registers
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that GDB thinks about (all NUM_REGS of them),
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so that they appear in order of ascending GDB register number.
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The fault code will be on the stack beyond the last register. */
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#define PUSH_REGISTERS {}
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/* Assuming the registers (including processor status) have been
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pushed on the stack in order of ascending GDB register number,
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restore them and return to the address in the saved PC register. */
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#define POP_REGISTERS {}
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#endif /* 0 */
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