From 189cbcfdad097363e66f41daf4d6a76acbf3661c Mon Sep 17 00:00:00 2001
From: Mitchell Johnson <ehntoo@ehntoo.org>
Date: Sun, 4 Sep 2022 17:33:39 -0400
Subject: Fix 32-bit Thumb unconditional branch decoding

T4 encodings of unconditional branches were not being interpreted correctly
(#6), and 32-bit bl/blx instructions were similarly incorrect. Correct the bits
selected for op1 and op2 and handle the slightly-unusual i1/i2 sign bit xor for
these instructions.
---
 tests/armv7/thumb.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'tests/armv7/thumb.rs')

diff --git a/tests/armv7/thumb.rs b/tests/armv7/thumb.rs
index 9182f6e..be5434f 100644
--- a/tests/armv7/thumb.rs
+++ b/tests/armv7/thumb.rs
@@ -723,6 +723,19 @@ fn test_decode_bcc_cases() {
     );
 }
 #[test]
+fn test_decode_32b_branch_cases() {
+    // encoding t4
+    test_display(
+        &[0xf3, 0xf7, 0x7c, 0xbe],
+        "b.w $-0xc308"
+    );
+    // encoding t4
+    test_display(
+        &[0x0c, 0xf0, 0x84, 0xb9],
+        "b.w $+0xc308"
+    );
+}
+#[test]
 fn test_decode_bkpt_cases() {
     test_display(
         &[0x00, 0xbe],
-- 
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