diff options
Diffstat (limited to 'src/core/arm/interpreter')
| -rw-r--r-- | src/core/arm/interpreter/armemu.cpp | 107 |
1 files changed, 42 insertions, 65 deletions
diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp index a955d6aac..dcc0acafe 100644 --- a/src/core/arm/interpreter/armemu.cpp +++ b/src/core/arm/interpreter/armemu.cpp @@ -6422,79 +6422,56 @@ L_stm_s_takeabort: return 1; } break; - case 0x6e: { - ARMword Rm; - int ror = -1; - - switch (BITS(4, 11)) { - case 0x07: - ror = 0; - break; - case 0x47: - ror = 8; - break; - case 0x87: - ror = 16; - break; - case 0xc7: - ror = 24; - break; - - case 0x01: - case 0xf3: - //ichfly - //USAT16 - { - const u8 rd_idx = BITS(12, 15); - const u8 rn_idx = BITS(0, 3); - const u8 num_bits = BITS(16, 19); - const s16 max = 0xFFFF >> (16 - num_bits); - s16 rn_lo = (state->Reg[rn_idx]); - s16 rn_hi = (state->Reg[rn_idx] >> 16); - - if (max < rn_lo) { - rn_lo = max; - SETQ; - } else if (rn_lo < 0) { - rn_lo = 0; - SETQ; - } - - if (max < rn_hi) { - rn_hi = max; - SETQ; - } else if (rn_hi < 0) { - rn_hi = 0; - SETQ; - } + case 0x6e: // USAT, USAT16, UXTB, and UXTAB + { + const u8 op2 = BITS(5, 7); - state->Reg[rd_idx] = (rn_lo & 0xFFFF) | ((rn_hi << 16) & 0xFFFF); - return 1; + // USAT16 + if (op2 == 0x01) { + const u8 rd_idx = BITS(12, 15); + const u8 rn_idx = BITS(0, 3); + const u8 num_bits = BITS(16, 19); + const s16 max = 0xFFFF >> (16 - num_bits); + s16 rn_lo = (state->Reg[rn_idx]); + s16 rn_hi = (state->Reg[rn_idx] >> 16); + + if (max < rn_lo) { + rn_lo = max; + SETQ; + } else if (rn_lo < 0) { + rn_lo = 0; + SETQ; } - - default: - break; - } - - if (ror == -1) { - if (BITS(4, 6) == 0x7) { - printf("Unhandled v6 insn: usat\n"); - return 0; + + if (max < rn_hi) { + rn_hi = max; + SETQ; + } else if (rn_hi < 0) { + rn_hi = 0; + SETQ; } - break; + + state->Reg[rd_idx] = (rn_lo & 0xFFFF) | ((rn_hi << 16) & 0xFFFF); + return 1; } - - Rm = ((state->Reg[BITS(0, 3)] >> ror) & 0xFF) | (((state->Reg[BITS(0, 3)] << (32 - ror)) & 0xFF) & 0xFF); - - if (BITS(16, 19) == 0xf) + else if (op2 == 0x03) { + const u8 rotate = BITS(10, 11) * 8; + const u32 rm = ((state->Reg[BITS(0, 3)] >> rotate) & 0xFF) | (((state->Reg[BITS(0, 3)] << (32 - rotate)) & 0xFF) & 0xFF); + + if (BITS(16, 19) == 0xf) /* UXTB */ - state->Reg[BITS(12, 15)] = Rm; - else + state->Reg[BITS(12, 15)] = rm; + else /* UXTAB */ - state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + Rm; + state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + rm; - return 1; + return 1; + } + else { + printf("Unimplemented op: USAT"); + } } + break; case 0x6f: // UXTH, UXTAH, and REVSH. { |