home *** CD-ROM | disk | FTP | other *** search
- /* Macro definitions for i386 running under BSD Unix.
- Copyright 1986, 1987, 1989, 1991, 1992, 1993 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. */
-
- /* Override number of expected traps from sysv. */
- #define START_INFERIOR_TRAPS_EXPECTED 2
-
- /* Most definitions from sysv could be used. */
- #include "i386/tm-i386v.h"
-
- /* 386BSD cannot handle the segment registers. */
- /* BSDI can't handle them either. */
- #undef NUM_REGS
- #define NUM_REGS 10
-
- /* On 386 bsd, sigtramp is above the user stack and immediately below
- the user area. Using constants here allows for cross debugging.
- These are tested for BSDI but should work on 386BSD. */
- #define SIGTRAMP_START 0xfdbfdfc0
- #define SIGTRAMP_END 0xfdbfe000
-
- /* The following redefines make backtracing through sigtramp work.
- They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp
- from the sigcontext structure which is pushed by the kernel on the
- user stack, along with a pointer to it. */
-
- /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
- chain-pointer.
- In the case of the i386, the frame's nominal address
- is the address of a 4-byte word containing the calling frame's address. */
- #undef FRAME_CHAIN
- #define FRAME_CHAIN(thisframe) \
- (thisframe->signal_handler_caller \
- ? thisframe->frame \
- : (!inside_entry_file ((thisframe)->pc) \
- ? read_memory_integer ((thisframe)->frame, 4) \
- : 0))
-
- /* A macro that tells us whether the function invocation represented
- by FI does not have a frame on the stack associated with it. If it
- does not, FRAMELESS is set to 1, else 0. */
- #undef FRAMELESS_FUNCTION_INVOCATION
- #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
- do { \
- if ((FI)->signal_handler_caller) \
- (FRAMELESS) = 0; \
- else \
- (FRAMELESS) = frameless_look_for_prologue(FI); \
- } while (0)
-
- /* Saved Pc. Get it from sigcontext if within sigtramp. */
-
- /* Offset to saved PC in sigcontext, from <sys/signal.h>. */
- #define SIGCONTEXT_PC_OFFSET 20
-
- #undef FRAME_SAVED_PC
- #define FRAME_SAVED_PC(FRAME) \
- (((FRAME)->signal_handler_caller \
- ? sigtramp_saved_pc (FRAME) \
- : read_memory_integer ((FRAME)->frame + 4, 4)) \
- )
-