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92 lines
1.6 KiB
C
92 lines
1.6 KiB
C
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/*++
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Copyright (c) 1998-2001 Klaus P. Gerlicher
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Module Name:
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trace.c
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Abstract:
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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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19-Aug-1998: created
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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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extern void NewInt31Handler(void);
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void DeInstallTraceHook(void);
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volatile ULONG OldInt1Handler=0;
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BOOLEAN InstallTraceHook(void)
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{
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ULONG LocalInt1Handler;
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DPRINT((0,"InstallTraceHook(OldInt1Handler=%0.8x)...\n",OldInt1Handler));
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MaskIrqs();
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if(!OldInt1Handler)
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{
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__asm__("mov $NewInt1Handler,%0"
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:"=r" (LocalInt1Handler)
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:
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:"eax");
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OldInt1Handler=SetGlobalInt(0x01,(ULONG)LocalInt1Handler);
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}
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UnmaskIrqs();
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return TRUE;
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}
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//this asm function must be at least second in the file. otherwise gcc does not
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//generate correct code.
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__asm__("\n\t \
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NewInt1Handler:\n\t \
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pushl %eax\n\t \
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movl %dr6,%eax\n\t \
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testl $(1<<14),%eax\n\t \
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jz exceptionnotsinglestep\n\t \
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\n\t \
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popl %eax\n\t \
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pushl $" STR(REASON_SINGLESTEP) "\n\t \
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jmp NewInt31Handler\n\t \
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\n\t \
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exceptionnotsinglestep:\n\t \
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popl %eax\n\t \
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pushl $" STR(REASON_HARDWARE_BP) "\n\t \
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jmp NewInt31Handler\n\t \
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");
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void DeInstallTraceHook(void)
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{
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DPRINT((0,"DeInstallTraceHook(OldInt1Handler=%0.8x)...\n",OldInt1Handler));
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MaskIrqs();
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if(OldInt1Handler)
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{
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SetGlobalInt(0x01,(ULONG)OldInt1Handler);
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OldInt1Handler = 0;
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}
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UnmaskIrqs();
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}
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