reactos/apps/utils/pice/module/trace.c

   1 /*++
   2
   3 Copyright (c) 1998-2001 Klaus P. Gerlicher
   4
   5 Module Name:
   6
   7     trace.c
   8
   9 Abstract:
  10
  11 Environment:
  12
  13     Kernel mode only
  14
  15 Author:
  16
  17     Klaus P. Gerlicher
  18
  19 Revision History:
  20
  21     19-Aug-1998:        created
  22
  23 Copyright notice:
  24
  25   This file may be distributed under the terms of the GNU Public License.
  26
  27 --*/
  28
  29 ////////////////////////////////////////////////////
  30 // INCLUDES
  31 ////
  32 #include "remods.h"
  33
  34 #include "precomp.h"
  35
  36 extern void NewInt31Handler(void);
  37
  38 void DeInstallTraceHook(void);
  39
  40 volatile ULONG OldInt1Handler=0;
  41
  42 __asm__("
  43 NewInt1Handler:
  44         pushl %eax
  45                 movl %dr6,%eax
  46                 testl $(1<<14),%eax
  47                 jz exceptionnotsinglestep
  48
  49         popl %eax
  50         pushl $" STR(REASON_SINGLESTEP) "
  51         jmp NewInt31Handler
  52
  53 exceptionnotsinglestep:
  54         popl %eax
  55         pushl $" STR(REASON_HARDWARE_BP) "
  56         jmp NewInt31Handler
  57 ");
  58
  59 BOOLEAN InstallTraceHook(void)
  60 {
  61         ULONG LocalInt1Handler;
  62
  63     DPRINT((0,"InstallTraceHook(OldInt1Handler=%0.8x)...\n",OldInt1Handler));
  64
  65         MaskIrqs();
  66         if(!OldInt1Handler)
  67         {
  68                 __asm__("mov $NewInt1Handler,%0"
  69                         :"=r" (LocalInt1Handler)
  70                         :
  71                         :"eax");
  72                 OldInt1Handler=SetGlobalInt(0x01,(ULONG)LocalInt1Handler);
  73         }
  74         UnmaskIrqs();
  75         return TRUE;
  76 }
  77
  78 void DeInstallTraceHook(void)
  79 {
  80         DPRINT((0,"DeInstallTraceHook(OldInt1Handler=%0.8x)...\n",OldInt1Handler));
  81
  82         MaskIrqs();
  83         if(OldInt1Handler)
  84         {
  85                 SetGlobalInt(0x01,(ULONG)OldInt1Handler);
  86         OldInt1Handler = 0;
  87         }
  88         UnmaskIrqs();
  89 }