Added indirection for ctx_debug to the DOS loader, so Winelib works

include/dosexe.h

@@ -38,6 +38,8 @@ extern void MZ_KillModule( LPDOSTASK lpDosTask );
 
 #endif /* linux */
 
+extern void (*ctx_debug_call)( int sig, CONTEXT* );
+
 extern HINSTANCE16 MZ_CreateProcess( LPCSTR name, LPCSTR cmdline, LPCSTR env,
                                      LPSTARTUPINFO32A startup, LPPROCESS_INFORMATION info );
 extern int DOSVM_Enter( PCONTEXT context );

loader/dos/dosvm.c

@@ -27,6 +27,8 @@
 #include "ldt.h"
 #include "dosexe.h"
 
+void (*ctx_debug_call)(int sig,CONTEXT*ctx)=NULL;
+
 #ifdef MZ_SUPPORTED
 
 #include <sys/mman.h>
@@ -99,7 +101,7 @@ static int DOSVM_Process( LPDOSTASK lpDosTask, int fn,
    ret=-1; break;
   case VM86_UNKNOWN: /* unhandled GPF */
    DOSVM_Dump(lpDosTask,fn,VM86);
-   ctx_debug(SIGSEGV,&context);
+   if (ctx_debug_call) ctx_debug_call(SIGSEGV,&context); else ret=-1;
    break;
   case VM86_INTx:
    TRACE(int,"DOS EXE calls INT %02x with AX=%04lx\n",VM86_ARG(fn),context.Eax);
@@ -109,7 +111,7 @@ static int DOSVM_Process( LPDOSTASK lpDosTask, int fn,
   case VM86_PICRETURN:
    printf("Trapped due to pending PIC request\n"); break;
   case VM86_TRAP:
-   ctx_debug(SIGTRAP,&context);
+   if (ctx_debug_call) ctx_debug_call(SIGTRAP,&context);
    break;
   default:
    DOSVM_Dump(lpDosTask,fn,VM86);

miscemu/main.c

@@ -130,6 +130,7 @@ int main( int argc, char *argv[] )
 
     if (Options.debug) DEBUG_AddModuleBreakpoints();
 
+    ctx_debug_call = ctx_debug;
     IF1632_CallLargeStack = (int (*)(int (*func)(), void *arg))CALL32_Init();
     Yield16();  /* Start the first task */
     MSG("WinMain: Should never happen: returned from Yield16()\n" );