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143 lines
2.8 KiB
C
143 lines
2.8 KiB
C
/*++
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Copyright (c) 1998-2001 Klaus P. Gerlicher
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Module Name:
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GPFault.c
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Abstract:
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handle general protection faults on x86
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Environment:
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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 OldGPFaultHandler = 0;
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char tempGP[1024];
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////////////////////////////////////////////////////
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// FUNCTIONS
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////
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//*************************************************************************
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// NewGPFaultHandler()
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//
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//*************************************************************************
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void HandleGPFault(FRAME* ptr)
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{
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DPRINT((0,"HandleGPFault(): ptr = %x at eip: %x\n",ptr, ptr->eip));
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}
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//*************************************************************************
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// NewGPFaultHandler()
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//
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//*************************************************************************
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__asm__ ("\n\t \
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NewGPFaultHandler:\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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// test for v86 mode\n\t \
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testl $0x20000,40(%esp)\n\t \
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jnz notv86\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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.byte 0x2e\n\t \
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jmp *_OldGPFaultHandler\n\t \
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notv86:\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 _HandleGPFault\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_GP_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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//*************************************************************************
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// InstallGPFaultHook()
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//
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//*************************************************************************
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void InstallGPFaultHook(void)
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{
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ULONG LocalGPFaultHandler;
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ENTER_FUNC();
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MaskIrqs();
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if(!OldGPFaultHandler)
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{
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__asm__("mov $NewGPFaultHandler,%0"
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:"=r" (LocalGPFaultHandler)
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:
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:"eax");
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OldGPFaultHandler=SetGlobalInt(0x0D,(ULONG)LocalGPFaultHandler);
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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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// DeInstallGPFaultHook()
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//
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//*************************************************************************
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void DeInstallGPFaultHook(void)
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{
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ENTER_FUNC();
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MaskIrqs();
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if(OldGPFaultHandler)
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{
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RemoveAllSWBreakpoints(TRUE);
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SetGlobalInt(0x0D,(ULONG)OldGPFaultHandler);
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OldGPFaultHandler=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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