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- /* Macro defintions for i386.
- Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /*
- * Changes for 80386 by Pace Willisson (pace@prep.ai.mit.edu)
- * July 1988
- */
-
- #define HOST_BYTE_ORDER LITTLE_ENDIAN
-
- /* I'm running gdb 3.4 under 386/ix 2.0.2, which is a derivative of AT&T's
- Sys V/386 3.2.
-
- On some machines, gdb crashes when it's starting up while calling the
- vendor's termio tgetent() routine. It always works when run under
- itself (actually, under 3.2, it's not an infinitely recursive bug.)
- After some poking around, it appears that depending on the environment
- size, or whether you're running YP, or the phase of the moon or something,
- the stack is not always long-aligned when main() is called, and tgetent()
- takes strong offense at that. On some machines this bug never appears, but
- on those where it does, it occurs quite reliably. */
- #define ALIGN_STACK_ON_STARTUP
-
- /* define USG if you are using sys5 /usr/include's */
- #define USG
-
- /* USG systems need these */
- #define vfork() fork()
- #define MAXPATHLEN 500
-
- #define HAVE_TERMIO
-
- /* Get rid of any system-imposed stack limit if possible. */
-
- /* #define SET_STACK_LIMIT_HUGE not in sys5 */
-
- /* This is the amount to subtract from u.u_ar0
- to get the offset in the core file of the register values. */
-
- #define KERNEL_U_ADDR 0xe0000000
-
-
- #if 0
- /* Interface definitions for kernel debugger KDB. */
-
- /* Map machine fault codes into signal numbers.
- First subtract 0, divide by 4, then index in a table.
- Faults for which the entry in this table is 0
- are not handled by KDB; the program's own trap handler
- gets to handle then. */
-
- #define FAULT_CODE_ORIGIN 0
- #define FAULT_CODE_UNITS 4
- #define FAULT_TABLE \
- { 0, 0, 0, 0, 0, 0, 0, 0, \
- 0, 0, 0, 0, 0, 0, 0, 0, \
- 0, 0, 0, 0, 0, 0, 0, 0}
-
- /* Start running with a stack stretching from BEG to END.
- BEG and END should be symbols meaningful to the assembler.
- This is used only for kdb. */
-
- #define INIT_STACK(beg, end) {}
-
- /* Push the frame pointer register on the stack. */
- #define PUSH_FRAME_PTR {}
-
- /* Copy the top-of-stack to the frame pointer register. */
- #define POP_FRAME_PTR {}
-
- /* After KDB is entered by a fault, push all registers
- that GDB thinks about (all NUM_REGS of them),
- so that they appear in order of ascending GDB register number.
- The fault code will be on the stack beyond the last register. */
-
- #define PUSH_REGISTERS {}
-
- /* Assuming the registers (including processor status) have been
- pushed on the stack in order of ascending GDB register number,
- restore them and return to the address in the saved PC register. */
-
- #define POP_REGISTERS {}
- #endif /* 0 */
-