add the mips decoder

1 files changed, 152 insertions, 25 deletions

diff --git a/test/test.rs b/test/test.rs
index 7af242d..45ec234 100644
--- a/test/test.rs
+++ b/test/test.rs
@@ -1,43 +1,170 @@
+extern crate yaxpeax_arch;
+extern crate yaxpeax_mips;
+
+use yaxpeax_arch::{Arch, Decoder, LengthedInstruction};
+use yaxpeax_mips::{MIPS, Instruction, Opcode};
+
+fn test_decode(data: [u8; 4], expected: Instruction) {
+    let instr = <MIPS as Arch>::Decoder::default().decode(data.to_vec()).unwrap();
+    assert!(
+        instr == expected,
+        "decode error for {:02x}{:02x}{:02x}{:02x}:\n  decoded: {:?}\n expected: {:?}\n",
+        data[0], data[1], data[2], data[3],
+        instr, expected
+    );
+}
+
+fn test_display(data: [u8; 4], expected: &'static str) {
+    let instr = <MIPS as Arch>::Decoder::default().decode(data.to_vec()).unwrap();
+    let text = format!("{}", instr);
+    assert!(
+        text == expected,
+        "display error for {:02x}{:02x}{:02x}{:02x}:\n  decoded: {:?}\n displayed: {}\n expected: {}\n",
+        data[0], data[1], data[2], data[3],
+        instr,
+        text, expected
+    );
+}
+
 #[test]
 fn test_arithmetic() {
-// 21080008 addi t0, t0, 8
-// 2129fff8 addi t1, t1, -8
-// 2404010c addiu a0, zero, 0x10c
-// 2508ae20 addui t0, t0, -0x51e0
-// 352923a0 ori t1, t1, 0x23a0
-// 00042300 sll a0, a0, 0xc
+    test_display(
+        [0x08, 0x00, 0x00, 0x21],
+        "addi zero, t0, 0x8"
+    );
+    test_display(
+        [0xf8, 0xff, 0x29, 0x21],
+        "addi t1, t1, -0x8"
+    );
+    test_display(
+        [0x0c, 0x01, 0x04, 0x24],
+        "addiu a0, zero, 0x10c"
+    );
+    test_display(
+        [0x20, 0xae, 0x08, 0x25],
+        "addiu t0, t0, -0x51e0"
+    );
+    test_display(
+        [0xa0, 0x23, 0x29, 0x35],
+        "ori t1, t1, 0x23a0"
+    );
+    test_display(
+        [0x00, 0x23, 0x04, 0x00],
+        "sll a0, a0, 0xc"
+    );
 }
 #[test]
 fn test_br() {
-// 1520fffc bnez t1, 0x80001010
-// 01400008 jr t2
-// 03e00008 jr ra
-// 10000008 b 0x8000171c
-// 0c0005ab jal 0x800016ac
+    test_display(
+        [0xfc, 0xff, 0x20, 0x15],
+        "bne t1, zero, -0x4"
+    );
+    test_display(
+        [0x08, 0x00, 0x40, 0x01],
+        "jr t2"
+    );
+    test_display(
+        [0x08, 0x00, 0xe0, 0x03],
+        "jr ra"
+    );
+    test_display(
+        [0x08, 0x00, 0x00, 0x10],
+        "b $+0x8"
+    );
+    // TODO: this is inaccurate! this really is setting the low 28 bits of $pc, not branching
+    // forward or something.
+    test_display(
+        [0xab, 0x05, 0x00, 0x0c],
+        "jal $+0x16ac"
+    );
 }
 #[test]
 fn test_cmp() {
 // slt
 // sltu
 // slti
-// 2de10007 sltiu at, t7, 1
+    test_display(
+        [0x07, 0x00, 0xe1, 0x2d],
+        "sltiu at, t7, 0x7"
+    );
 }
 #[test]
 fn test_mov() {
-// 8fbf0000 lw ra, (sp)
-// 3c088009 lui t0, 0x8009
-// 3c090002 lui t1, 2
-// 6fc07f00 ldr zero, 0x7f00(fp)
-// a429d266 sh t1, -0x2d9a(at)
-// ad000000 sw zero, (t0)
-// ad000004 sw zero, 4(t0)
-// 02002025 move a0, s0
+    test_display(
+        [0x00, 0x00, 0xbf, 0x8f],
+        "lw ra, (sp)"
+    );
+    test_display(
+        [0x09, 0x80, 0x08, 0x3c],
+        "lui t0, 0x8009"
+    );
+    test_display(
+        [0x02, 0x00, 0x09, 0x3c],
+        "lui t1, 0x2"
+    );
+    test_display(
+        [0x00, 0x7f, 0xc0, 0x6f],
+        "ldr zero, 0x7f00(fp)"
+    );
+    test_display(
+        [0x66, 0xd2, 0x29, 0xa4],
+        "sh t1, -0x2d9a(at)"
+    );
+    test_display(
+        [0x00, 0x00, 0x00, 0xad],
+        "sw zero, (t0)"
+    );
+    test_display(
+        [0x04, 0x00, 0x00, 0xad],
+        "sw zero, 0x4(t0)"
+    );
+    test_display(
+        [0x25, 0x20, 0x00, 0x02],
+        "move a0, s0"
+    );
 }
 #[test]
 fn test_misc() {
-// 00000000 nop
-// 40882800 mtc0 t0, a1, 0
-// 42000002 tlbwi
-// 42000008 tlbp
-// 40085000 mfc t0, t2, 0
+    test_display(
+        [0x00, 0x00, 0x00, 0x00],
+        "nop"
+    );
+    /*test_display(
+        [0x00, 0x28, 0x88, 0x40],
+        "mtc0 t0, a1, 0"
+    );*/
+    test_display(
+        [0x00, 0x28, 0x88, 0x40],
+        "cop1 0x882800"
+    );
+    /*
+    test_display(
+        [0x02, 0x00, 0x00, 0x42],
+        "tlbwi"
+    );
+    */
+    test_display(
+        [0x02, 0x00, 0x00, 0x42],
+        "cop1 0x2000002"
+    );
+    /*
+    test_display(
+        [0x08, 0x00, 0x00, 0x42],
+        "tlbp"
+    );
+    */
+    test_display(
+        [0x08, 0x00, 0x00, 0x42],
+        "cop1 0x2000008"
+    );
+    /*
+    test_display(
+        [0x00, 0x50, 0x08, 0x40],
+        "mfc t0, t2, 0"
+    );
+    */
+    test_display(
+        [0x00, 0x50, 0x08, 0x40],
+        "cop1 0x85000"
+    );
 }