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134 lines
2.6 KiB
C
134 lines
2.6 KiB
C
/*++
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Copyright (c) 1998-2001 Klaus P. Gerlicher
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Module Name:
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dblflt.c
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Abstract:
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handle double faults on x86
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Environment:
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LINUX 2.2.X
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Kernel mode only
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Author:
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Klaus P. Gerlicher
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Revision History:
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13-Nov-1999: created
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15-Nov-2000: general cleanup of source files
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Copyright notice:
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This file may be distributed under the terms of the GNU Public License.
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--*/
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////////////////////////////////////////////////////
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// INCLUDES
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////
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#include "remods.h"
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#include "precomp.h"
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////////////////////////////////////////////////////
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// GLOBALS
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////
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ULONG OldDblFltHandler = 0;
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////////////////////////////////////////////////////
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// FUNCTIONS
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////
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//*************************************************************************
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// HandleDoubleFault()
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//
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//*************************************************************************
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void HandleDoubleFault(FRAME* ptr)
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{
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DPRINT((0,"HandleDoubleFault(): ptr = %x\n",ptr));
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}
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//*************************************************************************
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// NewDblFltHandler()
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//
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//*************************************************************************
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__asm__ (" \
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NewDblFltHandler:\n\t \
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pushfl\n\t \
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cli;\n\t \
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cld;\n\t \
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pushal;\n\t \
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pushl %ds;\n\t \
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\n\t \
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// setup default data selectors\n\t \
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movw %ss,%ax\n\t \
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movw %ax,%ds\n\t \
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\n\t \
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// get frame ptr\n\t \
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lea 40(%esp),%eax\n\t \
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pushl %eax\n\t \
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call _HandleDoubleFault\n\t \
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addl $4,%esp\n\t \
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\n\t \
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popl %ds\n\t \
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popal\n\t \
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popfl\n\t \
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// remove error code from stack and replace with reason code\n\t \
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movl $" STR(REASON_DOUBLE_FAULT) ",(%esp)\n\t \
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// call debugger loop\n\t \
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jmp NewInt31Handler\n\t");
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//*************************************************************************
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// InstallDblFltHook()
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//
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//*************************************************************************
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void InstallDblFltHook(void)
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{
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ULONG LocalDblFltHandler;
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ENTER_FUNC();
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MaskIrqs();
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if(!OldDblFltHandler)
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{
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__asm__("mov $NewDblFltHandler,%0"
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:"=r" (LocalDblFltHandler)
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:
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:"eax");
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OldDblFltHandler=SetGlobalInt(0x08,(ULONG)LocalDblFltHandler);
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}
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UnmaskIrqs();
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LEAVE_FUNC();
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}
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//*************************************************************************
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// DeInstallDblFltHook()
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//
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//*************************************************************************
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void DeInstallDblFltHook(void)
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{
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ENTER_FUNC();
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MaskIrqs();
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if(OldDblFltHandler)
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{
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RemoveAllSWBreakpoints(TRUE);
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SetGlobalInt(0x08,(ULONG)OldDblFltHandler);
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OldDblFltHandler=0;
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}
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UnmaskIrqs();
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LEAVE_FUNC();
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}
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// EOF
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