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- /* 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 *));
-