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85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
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/* Target-dependent code for i386 BSD's.
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Copyright 2001 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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#include "defs.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "regcache.h"
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/* Support for signal handlers. */
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/* Range in which to find the signaltramp routine, traditionally found
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on the use stack, just below the user area. Initialized to values
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that work for NetBSD and FreeBSD. */
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CORE_ADDR i386bsd_sigtramp_start = 0xbfbfdf20;
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CORE_ADDR i386bsd_sigtramp_end = 0xbfbfdff0;
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/* Return whether PC is in a BSD sigtramp routine. */
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int
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i386bsd_in_sigtramp (CORE_ADDR pc, char *name)
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{
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return (pc >= i386bsd_sigtramp_start && pc < i386bsd_sigtramp_end);
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}
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/* Offset in the sigcontext structure of the program counter.
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Initialized to the value from 4.4 BSD Lite. */
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int i386bsd_sigcontext_pc_offset = 20;
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/* Assuming FRAME is for a BSD sigtramp routine, return the address of
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the associated sigcontext structure. */
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static CORE_ADDR
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i386bsd_sigcontext_addr (struct frame_info *frame)
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{
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if (frame->next)
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/* If this isn't the top frame, the next frame must be for the
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signal handler itself. A pointer to the sigcontext structure
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is passed as the third argument to the signal handler. */
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return read_memory_unsigned_integer (frame->next->frame + 16, 4);
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/* This is the top frame. We'll have to find the address of the
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sigcontext structure by looking at the stack pointer. */
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return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4);
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}
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/* Assuming FRAME is for a BSD sigtramp routine, return the saved
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program counter. */
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static CORE_ADDR
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i386bsd_sigtramp_saved_pc (struct frame_info *frame)
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{
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CORE_ADDR addr;
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addr = i386bsd_sigcontext_addr (frame);
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return read_memory_unsigned_integer (addr + i386bsd_sigcontext_pc_offset, 4);
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}
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/* Return the saved program counter for FRAME. */
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CORE_ADDR
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i386bsd_frame_saved_pc (struct frame_info *frame)
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{
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if (frame->signal_handler_caller)
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return i386bsd_sigtramp_saved_pc (frame);
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return read_memory_unsigned_integer (frame->frame + 4, 4);
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}
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