107 lines
4 KiB
C
107 lines
4 KiB
C
/* Definitions to target GDB to GNU/Linux on 386.
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Copyright 1992, 1993 Free Software Foundation, Inc.
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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,
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Boston, MA 02111-1307, USA. */
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#ifndef TM_LINUX_H
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#define TM_LINUX_H
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/* FIXME: If nothing else gets added to this file, it could be removed
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and configure could just use tm-i386.h instead. -fnf */
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#include "i386/tm-i386.h"
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/* Size of sigcontext, from <asm/sigcontext.h>. */
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#define LINUX_SIGCONTEXT_SIZE (88)
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/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */
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#define LINUX_SIGCONTEXT_PC_OFFSET (56)
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/* Offset to saved SP in sigcontext, from <asm/sigcontext.h>. */
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#define LINUX_SIGCONTEXT_SP_OFFSET (28)
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/* We need this file for the SOLIB_TRAMPOLINE stuff. */
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#include "tm-sysv4.h"
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/* The following works around a problem with /usr/include/sys/procfs.h */
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#define sys_quotactl 1
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/* When the i386 Linux kernel calls a signal handler, the return
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address points to a bit of code on the stack. These definitions
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are used to identify this bit of code as a signal trampoline in
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order to support backtracing through calls to signal handlers. */
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#define I386_LINUX_SIGTRAMP
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#define IN_SIGTRAMP(pc, name) ((name) == NULL && i386_linux_sigtramp (pc))
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extern int i386_linux_sigtramp PARAMS ((CORE_ADDR));
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/* We need our own version of sigtramp_saved_pc to get the saved PC in
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a sigtramp routine. */
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#define sigtramp_saved_pc i386_linux_sigtramp_saved_pc
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extern CORE_ADDR i386_linux_sigtramp_saved_pc PARAMS ((struct frame_info *));
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/* Signal trampolines don't have a meaningful frame. As in tm-i386.h,
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the frame pointer value we use is actually the frame pointer of the
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calling frame--that is, the frame which was in progress when the
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signal trampoline was entered. gdb mostly treats this frame
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pointer value as a magic cookie. We detect the case of a signal
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trampoline by looking at the SIGNAL_HANDLER_CALLER field, which is
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set based on IN_SIGTRAMP.
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When a signal trampoline is invoked from a frameless function, we
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essentially have two frameless functions in a row. In this case,
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we use the same magic cookie for three frames in a row. We detect
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this case by seeing whether the next frame has
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SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the
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current frame is actually frameless. In this case, we need to get
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the PC by looking at the SP register value stored in the signal
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context.
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This should work in most cases except in horrible situations where
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a signal occurs just as we enter a function but before the frame
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has been set up. */
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#define FRAMELESS_SIGNAL(FRAME) \
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((FRAME)->next != NULL \
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&& (FRAME)->next->signal_handler_caller \
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&& frameless_look_for_prologue (FRAME))
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#undef FRAME_CHAIN
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#define FRAME_CHAIN(FRAME) \
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((FRAME)->signal_handler_caller \
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? (FRAME)->frame \
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: (FRAMELESS_SIGNAL (FRAME) \
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? (FRAME)->frame \
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: (!inside_entry_file ((FRAME)->pc) \
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? read_memory_integer ((FRAME)->frame, 4) \
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: 0)))
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#undef FRAME_SAVED_PC
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#define FRAME_SAVED_PC(FRAME) \
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((FRAME)->signal_handler_caller \
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? sigtramp_saved_pc (FRAME) \
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: (FRAMELESS_SIGNAL (FRAME) \
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? read_memory_integer (i386_linux_sigtramp_saved_sp ((FRAME)->next), 4) \
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: read_memory_integer ((FRAME)->frame + 4, 4)))
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extern CORE_ADDR i386_linux_sigtramp_saved_sp PARAMS ((struct frame_info *));
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#endif /* #ifndef TM_LINUX_H */
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