78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
/* Macro definitions for GDB on an Intel i386 running SVR4.
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Copyright (C) 1991, 1994 Free Software Foundation, Inc.
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Written by Fred Fish at Cygnus Support (fnf@cygnus.com)
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef TM_I386V4_H
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#define TM_I386V4_H 1
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/* Pick up most of what we need from the generic i386 target include file. */
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#include "i386/tm-i386.h"
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/* Pick up more stuff from the generic SVR4 host include file. */
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#include "tm-sysv4.h"
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/* Use the alternate method of determining valid frame chains. */
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#define FRAME_CHAIN_VALID(fp,fi) alternate_frame_chain_valid (fp, fi)
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/* Offsets (in target ints) into jmp_buf. Not defined in any system header
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file, so we have to step through setjmp/longjmp with a debugger and figure
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them out. Note that <setjmp> defines _JBLEN as 10, which is the default
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if no specific machine is selected, even though we only use 6 slots. */
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#define JB_ELEMENT_SIZE sizeof(int) /* jmp_buf[_JBLEN] is array of ints */
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#define JB_EBX 0
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#define JB_ESI 1
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#define JB_EDI 2
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#define JB_EBP 3
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#define JB_ESP 4
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#define JB_EDX 5
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#define JB_PC JB_EDX /* Setjmp()'s return PC saved in EDX */
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/* Figure out where the longjmp will land. Slurp the args out of the stack.
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We expect the first arg to be a pointer to the jmp_buf structure from which
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we extract the pc (JB_PC) that we will land at. The pc is copied into ADDR.
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This routine returns true on success */
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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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/* Saved Pc. Get it from ucontext if within sigtramp. */
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#define sigtramp_saved_pc i386v4_sigtramp_saved_pc
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extern CORE_ADDR i386v4_sigtramp_saved_pc PARAMS ((struct frame_info *));
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#endif /* ifndef TM_I386V4_H */
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