114 lines
4.1 KiB
C
114 lines
4.1 KiB
C
/* Macro definitions for GDB on an Intel i386 running SVR4.
|
|
Copyright (C) 1991, 1994 Free Software Foundation, Inc.
|
|
Written by Fred Fish at Cygnus Support (fnf@cygint)
|
|
|
|
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. */
|
|
|
|
/* Use the alternate method of determining valid frame chains. */
|
|
|
|
#define FRAME_CHAIN_VALID_ALTERNATE
|
|
|
|
/* number of traps that happen between exec'ing the shell
|
|
* to run an inferior, and when we finally get to
|
|
* the inferior code. This is 2 on most implementations.
|
|
*/
|
|
#define START_INFERIOR_TRAPS_EXPECTED 2
|
|
|
|
/* Pick up most of what we need from the generic i386 target include file. */
|
|
|
|
#include "i386/tm-i386v.h"
|
|
|
|
/* Pick up more stuff from the generic SVR4 host include file. */
|
|
|
|
#include "tm-sysv4.h"
|
|
|
|
/* We can't tell how many args there are
|
|
now that the C compiler delays popping them. */
|
|
|
|
#undef FRAME_NUM_ARGS
|
|
#define FRAME_NUM_ARGS(val,fi) (val = -1)
|
|
|
|
/* Offsets (in target ints) into jmp_buf. Not defined in any system header
|
|
file, so we have to step through setjmp/longjmp with a debugger and figure
|
|
them out. Note that <setjmp> defines _JBLEN as 10, which is the default
|
|
if no specific machine is selected, even though we only use 6 slots. */
|
|
|
|
#define JB_ELEMENT_SIZE sizeof(int) /* jmp_buf[_JBLEN] is array of ints */
|
|
|
|
#define JB_EBX 0
|
|
#define JB_ESI 1
|
|
#define JB_EDI 2
|
|
#define JB_EBP 3
|
|
#define JB_ESP 4
|
|
#define JB_EDX 5
|
|
|
|
#define JB_PC JB_EDX /* Setjmp()'s return PC saved in EDX */
|
|
|
|
/* Figure out where the longjmp will land. Slurp the args out of the stack.
|
|
We expect the first arg to be a pointer to the jmp_buf structure from which
|
|
we extract the pc (JB_PC) that we will land at. The pc is copied into ADDR.
|
|
This routine returns true on success */
|
|
|
|
extern int
|
|
get_longjmp_target PARAMS ((CORE_ADDR *));
|
|
|
|
#define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
|
|
|
|
/* The following redefines make backtracing through sigtramp work.
|
|
They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp
|
|
from the ucontext structure which is pushed by the kernel on the
|
|
user stack. Unfortunately there are three variants of sigtramp handlers. */
|
|
|
|
#define I386V4_SIGTRAMP_SAVED_PC
|
|
#define IN_SIGTRAMP(pc, name) ((name) \
|
|
&& (STREQ ("_sigreturn", name) \
|
|
|| STREQ ("_sigacthandler", name) \
|
|
|| STREQ ("sigvechandler", name)))
|
|
|
|
/* 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 ucontext if within sigtramp. */
|
|
|
|
#undef FRAME_SAVED_PC
|
|
#define FRAME_SAVED_PC(FRAME) \
|
|
(((FRAME)->signal_handler_caller \
|
|
? i386v4_sigtramp_saved_pc (FRAME) \
|
|
: read_memory_integer ((FRAME)->frame + 4, 4)) \
|
|
)
|
|
extern CORE_ADDR i386v4_sigtramp_saved_pc PARAMS ((struct frame_info *));
|