Fix another x86 case and add regression tests

1 files changed, 41 insertions, 0 deletions

diff --git a/test/x86.test.c b/test/x86.test.c
new file mode 100644
index 0000000..ab0a679
--- /dev/null
+++ b/test/x86.test.c
@@ -0,0 +1,41 @@
+/* This file is dedicated to the public domain. */
+
+{.desc = "x86 opcode parsing"};
+
+#include "../src/x86.c"
+#include "../src/intdefs.h"
+
+TEST("The \"crazy\" instructions should be given correct lengths\n") {
+	const uchar test8[] = {
+		0xF6, 0x05, 0x12, 0x34, 0x56, 0x78, 0x12
+	};
+	const uchar test16[] = {
+		0x66, 0xF7, 0x05, 0x12, 0x34, 0x56, 0x78, 0x12, 0x34
+	};
+	const uchar test32[] = {
+		0xF7, 0x05, 0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78
+	};
+	const uchar not8[] = {
+		0xF6, 0x15, 0x12, 0x34, 0x56, 0x78
+	};
+	const uchar not16[] = {
+		0x66, 0xF7, 0x15, 0x12, 0x34, 0x56, 0x78
+	};
+	const uchar not32[] = {
+		0xF7, 0x15, 0x12, 0x34, 0x56, 0x78
+	};
+	if (x86_len(test8) != 7) return false;
+	if (x86_len(test16) != 9) return false;
+	if (x86_len(test32) != 10) return false;
+	if (x86_len(not8) != 6) return false;
+	if (x86_len(not16) != 7) return false;
+	if (x86_len(not32) != 6) return false;
+	return true;
+}
+
+TEST("SIB bytes should be decoded correctly") {
+	const uchar fstp[] = {0xD9, 0x1C, 0x24}; // old buggy case, for regressions
+	return x86_len(fstp) == 3;
+}
+
+// vi: sw=4 ts=4 noet tw=80 cc=80