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* config/i386/tm-i386v4.h (I386V4_SIGTRAMP_SAVED_PC, IN_SIGTRAMP, 

FRAME_CHAIN, FRAMELESS_FUNCTION_INVOCATION, FRAME_SAVED_PC):
	Define to make backtracing through the various sigtramp handlers
	work.
This commit is contained in:
Peter Schauer 1994-02-27 21:25:36 +00:00
parent 28ee4b4289
commit 7636cf204f
1 changed files with 46 additions and 1 deletions
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47
gdb/config/i386/tm-i386v4.h
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@ -1,5 +1,5 @@
/* Macro definitions for GDB on an Intel i386 running SVR4.
Copyright (C) 1991, Free Software Foundation, Inc.
Copyright (C) 1991, 1994 Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support (fnf@cygint)
This file is part of GDB.
@ -67,3 +67,48 @@ 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(FRAME)
#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 *));