diff options
Diffstat (limited to 'src/core/arm/dyncom')
| -rw-r--r-- | src/core/arm/dyncom/arm_dyncom_thumb.cpp | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/src/core/arm/dyncom/arm_dyncom_thumb.cpp b/src/core/arm/dyncom/arm_dyncom_thumb.cpp index 29272fd5d..3576370d1 100644 --- a/src/core/arm/dyncom/arm_dyncom_thumb.cpp +++ b/src/core/arm/dyncom/arm_dyncom_thumb.cpp @@ -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} |