use assembly

2005-11-04 16:05:20 +00:00
parent f493c9c544
commit 93a43be0ea
12 changed files with 569 additions and 43 deletions
--- a/win32-386/tas.c
+++ b/win32-386/tas.c
@@ -0,0 +1,23 @@
+#include "u.h"
+#include "libc.h"
+
+int
+tas(long *x)
+{
+	int     v;
+
+	__asm__(	"movl   $1, %%eax\n\t"
+			"xchgl  %%eax,(%%ecx)"
+			: "=a" (v)
+			: "c" (x)
+	);
+	switch(v) {
+	case 0:
+	case 1:
+		return v;
+	default:
+		print("canlock: corrupted 0x%lux\n", v);
+		return 1;
+	}
+}
+