diff options
Diffstat (limited to 'src/core/arm')
| -rw-r--r-- | src/core/arm/interpreter/armemu.cpp | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp index 5752d116f..5074542a4 100644 --- a/src/core/arm/interpreter/armemu.cpp +++ b/src/core/arm/interpreter/armemu.cpp @@ -1356,7 +1356,13 @@ mainswitch: } break; - case 0x04: /* SUB reg */ + case 0x04: /* SUB reg */ + // Signifies UMAAL + if (state->is_v6 && BITS(4, 7) == 0x09) { + if (handle_v6_insn(state, instr)) + break; + } + #ifdef MODET if (BITS (4, 7) == 0xB) { /* STRH immediate offset, no write-back, down, post indexed. */ @@ -5677,8 +5683,24 @@ L_stm_s_takeabort: case 0x03: printf ("Unhandled v6 insn: ldr\n"); break; - case 0x04: - printf ("Unhandled v6 insn: umaal\n"); + case 0x04: // UMAAL + { + const u8 rm_idx = BITS(8, 11); + const u8 rn_idx = BITS(0, 3); + const u8 rd_lo_idx = BITS(12, 15); + const u8 rd_hi_idx = BITS(16, 19); + + const u32 rm_val = state->Reg[rm_idx]; + const u32 rn_val = state->Reg[rn_idx]; + const u32 rd_lo_val = state->Reg[rd_lo_idx]; + const u32 rd_hi_val = state->Reg[rd_hi_idx]; + + const u64 result = (rn_val * rm_val) + rd_lo_val + rd_hi_val; + + state->Reg[rd_lo_idx] = (result & 0xFFFFFFFF); + state->Reg[rd_hi_idx] = ((result >> 32) & 0xFFFFFFFF); + return 1; + } break; case 0x06: printf ("Unhandled v6 insn: mls/str\n"); |