diff options
| -rw-r--r-- | gdb/config/i386/tm-i386v4.h | 47 |
1 files changed, 46 insertions, 1 deletions
diff --git a/gdb/config/i386/tm-i386v4.h b/gdb/config/i386/tm-i386v4.h index 1aa1e42..27fcc67 100644 --- a/gdb/config/i386/tm-i386v4.h +++ b/gdb/config/i386/tm-i386v4.h @@ -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 *)); |