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authorLioncash <mathew1800@gmail.com>2015-06-01 04:19:31 +0200
committerLioncash <mathew1800@gmail.com>2015-06-01 04:19:31 +0200
commit1974da272d81f56cdef4ec6b748a7ad702bbeaef (patch)
tree9ed146fa984f34dff2adbb881742675a74955d4c
parentMerge pull request #811 from archshift/commonify (diff)
parentarm_dyncom_thumb: Fix encoding of BKPT's immediate (diff)
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-rw-r--r--src/core/arm/dyncom/arm_dyncom_thumb.cpp43
1 files changed, 40 insertions, 3 deletions
diff --git a/src/core/arm/dyncom/arm_dyncom_thumb.cpp b/src/core/arm/dyncom/arm_dyncom_thumb.cpp
index 2fc8170be..83b532aac 100644
--- a/src/core/arm/dyncom/arm_dyncom_thumb.cpp
+++ b/src/core/arm/dyncom/arm_dyncom_thumb.cpp
@@ -274,9 +274,46 @@ tdstate thumb_translate(u32 addr, u32 instr, u32* ainstr, u32* inst_size) {
? 0xE24DDF00 // SUB
: 0xE28DDF00) // ADD
|(tinstr & 0x007F); // off7
- } else if ((tinstr & 0x0F00) == 0x0e00)
- *ainstr = 0xEF000000 | 0x180000; // base | BKPT mask
- else {
+ } else if ((tinstr & 0x0F00) == 0x0e00) {
+ // BKPT
+ *ainstr = 0xEF000000 // base
+ | BITS(tinstr, 0, 3) // imm4 field;
+ | (BITS(tinstr, 4, 7) << 8); // beginning 4 bits of imm12
+ } else if ((tinstr & 0x0F00) == 0x0200) {
+ static const ARMword subset[4] = {
+ 0xE6BF0070, // SXTH
+ 0xE6AF0070, // SXTB
+ 0xE6FF0070, // UXTH
+ 0xE6EF0070, // UXTB
+ };
+
+ *ainstr = subset[BITS(tinstr, 6, 7)] // base
+ | (BITS(tinstr, 0, 2) << 12) // Rd
+ | BITS(tinstr, 3, 5); // Rm
+ } else if ((tinstr & 0x0F00) == 0x600) {
+ if (BIT(tinstr, 5) == 0) {
+ // SETEND
+ *ainstr = 0xF1010000 // base
+ | (BIT(tinstr, 3) << 9); // endian specifier
+ } else {
+ // CPS
+ *ainstr = 0xF1080000 // base
+ | (BIT(tinstr, 0) << 6) // fiq bit
+ | (BIT(tinstr, 1) << 7) // irq bit
+ | (BIT(tinstr, 2) << 8) // abort bit
+ | (BIT(tinstr, 4) << 18); // enable bit
+ }
+ } else if ((tinstr & 0x0F00) == 0x0a00) {
+ static const ARMword subset[3] = {
+ 0xE6BF0F30, // REV
+ 0xE6BF0FB0, // REV16
+ 0xE6FF0FB0, // REVSH
+ };
+
+ *ainstr = subset[BITS(tinstr, 6, 7)] // base
+ | (BITS(tinstr, 0, 2) << 12) // Rd
+ | BITS(tinstr, 3, 5); // Rm
+ } else {
static const ARMword subset[4] = {
0xE92D0000, // STMDB sp!,{rlist}
0xE92D4000, // STMDB sp!,{rlist,lr}