add debug_break impl

This was SVN commit r728.

source/lib/sysdep/ia32.cpp

@@ -101,6 +101,12 @@ __asm
 }
 
 
+void ia32_debug_break()
+{
+	__asm int 3
+}
+
+
 //
 // data returned by cpuid()
 // each function using this data must call cpuid (no-op if already called)

source/lib/sysdep/ia32.h

@@ -39,6 +39,10 @@ extern u64 rdtsc();
 
 extern uint _control87(uint new_cw, uint mask);
 
+extern void ia32_debug_break();
+
+
+
 // CPU caps (128 bits)
 // do not change the order! (breaks cpuid())
 enum CpuCap

source/lib/sysdep/win/win.cpp

@@ -57,6 +57,12 @@ void wdisplay_msg(const wchar_t* caption, const wchar_t* msg)
 }
 
 
+void win_debug_break()
+{
+	DebugBreak();
+}
+
+
 
 // need to shoehorn printf-style variable params into
 // the OutputDebugString call.

source/lib/sysdep/win/win.h

@@ -19,4 +19,7 @@
 #define WINAPI __stdcall
 #define WINAPIV __cdecl
 
+
+extern "C" void win_debug_break();
+
 #endif	// #ifndef __WIN_H__