make cpu_abort dump cpu state in logfile, which is useful for debugging.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3260 c046a42c-6fe2-441c-8c8c-71466251a162

exec.c

@@ -1301,11 +1301,19 @@ void cpu_abort(CPUState *env, const char *fmt, ...)
 #else
     cpu_dump_state(env, stderr, fprintf, 0);
 #endif
-    va_end(ap);
     if (logfile) {
+        fprintf(logfile, "qemu: fatal: ");
+        vfprintf(logfile, fmt, ap);
+        fprintf(logfile, "\n");
+#ifdef TARGET_I386
+        cpu_dump_state(env, logfile, fprintf, X86_DUMP_FPU | X86_DUMP_CCOP);
+#else
+        cpu_dump_state(env, logfile, fprintf, 0);
+#endif
         fflush(logfile);
         fclose(logfile);
     }
+    va_end(ap);
     abort();
 }