* 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.
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@ -1,5 +1,5 @@
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/* Macro definitions for GDB on an Intel i386 running SVR4.
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Copyright (C) 1991, Free Software Foundation, Inc.
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Copyright (C) 1991, 1994 Free Software Foundation, Inc.
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Written by Fred Fish at Cygnus Support (fnf@cygint)
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This file is part of GDB.
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@ -67,3 +67,48 @@ extern int
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get_longjmp_target PARAMS ((CORE_ADDR *));
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#define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
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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 ucontext structure which is pushed by the kernel on the
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user stack. Unfortunately there are three variants of sigtramp handlers. */
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#define I386V4_SIGTRAMP_SAVED_PC
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#define IN_SIGTRAMP(pc, name) ((name) \
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&& (STREQ ("_sigreturn", name) \
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|| STREQ ("_sigacthandler", name) \
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|| STREQ ("sigvechandler", name)))
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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 ucontext if within sigtramp. */
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#undef FRAME_SAVED_PC(FRAME)
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#define FRAME_SAVED_PC(FRAME) \
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(((FRAME)->signal_handler_caller \
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? i386v4_sigtramp_saved_pc (FRAME) \
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: read_memory_integer ((FRAME)->frame + 4, 4)) \
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)
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extern CORE_ADDR i386v4_sigtramp_saved_pc PARAMS ((struct frame_info *));
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