1994-06-10 13:42:18 +00:00
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/* Macro definitions for i386 running under BSD Unix.
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Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
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This file is part of GDB.
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This program 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 2 of the License, or
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(at your option) any later version.
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This program 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 this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Override number of expected traps from sysv. */
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#define START_INFERIOR_TRAPS_EXPECTED 2
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/* Most definitions from sysv could be used. */
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#include "tm-i386v.h"
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/* 386BSD cannot handle the segment registers. */
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/* BSDI can't handle them either. */
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#undef NUM_REGS
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#define NUM_REGS 10
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/* On 386 bsd, sigtramp is above the user stack and immediately below
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the user area. Using constants here allows for cross debugging.
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These are tested for BSDI but should work on 386BSD. */
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#define SIGTRAMP_START 0xfdbfdfc0
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#define SIGTRAMP_END 0xfdbfe000
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/* The following redefines make backtracing through sigtramp work.
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They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp
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from the sigcontext structure which is pushed by the kernel on the
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user stack, along with a pointer to it. */
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/* FRAME_CHAIN takes a frame's nominal address and produces the frame's
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chain-pointer.
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In the case of the i386, the frame's nominal address
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is the address of a 4-byte word containing the calling frame's address. */
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#undef FRAME_CHAIN
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#define FRAME_CHAIN(thisframe) \
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(thisframe->signal_handler_caller \
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? thisframe->frame \
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: (!inside_entry_file ((thisframe)->pc) \
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? read_memory_integer ((thisframe)->frame, 4) \
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: 0))
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/* A macro that tells us whether the function invocation represented
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by FI does not have a frame on the stack associated with it. If it
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does not, FRAMELESS is set to 1, else 0. */
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#undef FRAMELESS_FUNCTION_INVOCATION
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#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
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do { \
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if ((FI)->signal_handler_caller) \
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(FRAMELESS) = 0; \
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else \
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(FRAMELESS) = frameless_look_for_prologue(FI); \
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} while (0)
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/* Saved Pc. Get it from sigcontext if within sigtramp. */
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/* Offset to saved PC in sigcontext, from <sys/signal.h>. */
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#define SIGCONTEXT_PC_OFFSET 20
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1994-12-30 23:27:33 +00:00
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#undef FRAME_SAVED_PC
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1994-06-10 13:42:18 +00:00
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#define FRAME_SAVED_PC(FRAME) \
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(((FRAME)->signal_handler_caller \
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? sigtramp_saved_pc (FRAME) \
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: read_memory_integer ((FRAME)->frame + 4, 4)) \
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)
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