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Merge pull request #1959 from MerryMage/revsh-upstream

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dyncom: Fix translation of thumb REVSH
This commit is contained in:
bunnei 2016-07-28 08:43:51 -04:00 committed by GitHub
commit 5c743ddfa8
1 changed files with 13 additions and 4 deletions
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17
src/core/arm/dyncom/arm_dyncom_thumb.cpp
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@ -2,6 +2,8 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <cstddef>
// We can provide simple Thumb simulation by decoding the Thumb instruction into its corresponding
// ARM instruction, and using the existing ARM simulator.
@ -293,15 +295,22 @@ ThumbDecodeStatus TranslateThumbInstruction(u32 addr, u32 instr, u32* ainstr, u3
| (BIT(tinstr, 4) << 18); // enable bit
}
} else if ((tinstr & 0x0F00) == 0x0a00) {
static const u32 subset[3] = {
static const u32 subset[4] = {
0xE6BF0F30, // REV
0xE6BF0FB0, // REV16
0, // undefined
0xE6FF0FB0, // REVSH
};
*ainstr = subset[BITS(tinstr, 6, 7)] // base
| (BITS(tinstr, 0, 2) << 12) // Rd
| BITS(tinstr, 3, 5); // Rm
size_t subset_index = BITS(tinstr, 6, 7);
if (subset_index == 2) {
valid = ThumbDecodeStatus::UNDEFINED;
} else {
*ainstr = subset[subset_index] // base
| (BITS(tinstr, 0, 2) << 12) // Rd
| BITS(tinstr, 3, 5); // Rm
}
} else {
static const u32 subset[4] = {
0xE92D0000, // STMDB sp!,{rlist}