diff options
Diffstat (limited to 'src/core/arm')
| -rw-r--r-- | src/core/arm/interpreter/armemu.cpp | 35 |
1 files changed, 25 insertions, 10 deletions
diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp index 33ebc7986..b846fbe9c 100644 --- a/src/core/arm/interpreter/armemu.cpp +++ b/src/core/arm/interpreter/armemu.cpp @@ -6101,17 +6101,32 @@ L_stm_s_takeabort: return 1; } - case 0x6c: - if ((instr & 0xf03f0) == 0xf0070) { //uxtb16 - u8 rm_idx = BITS(0, 3); - u8 rd_idx = BITS(12, 15); - u32 rm_val = state->Reg[rm_idx]; - u32 rotation = BITS(10, 11) * 8; - u32 in = ((rm_val << (32 - rotation)) | (rm_val >> rotation)); - state->Reg[rd_idx] = in & 0x00FF00FF; + case 0x6c: // UXTB16 and UXTAB16 + { + const u8 rm_idx = BITS(0, 3); + const u8 rn_idx = BITS(16, 19); + const u8 rd_idx = BITS(12, 15); + const u32 rm_val = state->Reg[rm_idx]; + const u32 rn_val = state->Reg[rn_idx]; + const u32 rotation = BITS(10, 11) * 8; + const u32 rotated_rm = ((rm_val << (32 - rotation)) | (rm_val >> rotation)); + + // UXTB16 + if ((instr & 0xf03f0) == 0xf0070) { + state->Reg[rd_idx] = rotated_rm & 0x00FF00FF; + } + else { // UXTAB16 + const u8 lo_rotated = (rotated_rm & 0xFF); + const u16 lo_result = (rn_val & 0xFFFF) + (u16)lo_rotated; + + const u8 hi_rotated = (rotated_rm >> 16) & 0xFF; + const u16 hi_result = (rn_val >> 16) + (u16)hi_rotated; + + state->Reg[rd_idx] = ((hi_result << 16) | (lo_result & 0xFFFF)); + } + return 1; - } else - printf ("Unhandled v6 insn: uxtab16\n"); + } break; case 0x6e: { ARMword Rm; |