Author: pluto
Date: Thu Aug 31 20:47:30 2006
New Revision: 7698
Modified:
backtracexx/backtracexx.cpp
Log:
- partial x86 decoder.
Modified: backtracexx/backtracexx.cpp
==============================================================================
--- backtracexx/backtracexx.cpp (original)
+++ backtracexx/backtracexx.cpp Thu Aug 31 20:47:30 2006
@@ -22,7 +22,22 @@
#elif defined( __alpha__ )
ip -= 4;
#elif defined( __i386__ ) || defined( __x86_64__ )
- // TODO: analysis of complex addressing forms (see
intel/24319102.pdf).
+ //
+ // TODO:
+ // analysis of complex addressing forms (see
intel/24319102.pdf).
+ // rework code to cover all cases.
+ //
+ // call, near, relative
+ if ( ip[ -5 ] == 0xe8 )
+ return ( ip - 5 );
+ // call, near, absolute indirect
+ if ( ip[ -2 ] == 0xff )
+ {
+ if ( ( ip[ -1 ] & 0xf8 ) == 0xd0 ) // call *%reg
+ return ( ip - 2 );
+ if ( ( ip[ -1 ] & 0xf8 ) == 0x10 ) // call
*(%reg)
+ return ( ip - 2 );
+ }
#endif
return ip;
}
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