diff options
Diffstat (limited to '')
| -rw-r--r-- | src/core/arm/interpreter/armemu.cpp | 119 |
1 files changed, 48 insertions, 71 deletions
diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp index 1b3a3478d..01d4e7708 100644 --- a/src/core/arm/interpreter/armemu.cpp +++ b/src/core/arm/interpreter/armemu.cpp @@ -6272,84 +6272,61 @@ L_stm_s_takeabort: return 1; } } - printf("Unhandled v6 insn: pkh/sxtab/selsxtb\n"); - break; - case 0x6a: { - 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 - //SSAT16 - { - const u8 rd_idx = BITS(12, 15); - const u8 rn_idx = BITS(0, 3); - const u8 num_bits = BITS(16, 19) + 1; - const s16 min = -(0x8000 >> (16 - num_bits)); - const s16 max = (0x7FFF >> (16 - num_bits)); - s16 rn_lo = (state->Reg[rn_idx]); - s16 rn_hi = (state->Reg[rn_idx] >> 16); - - if (rn_lo > max) { - rn_lo = max; - SETQ; - } else if (rn_lo < min) { - rn_lo = min; - SETQ; - } - - if (rn_hi > max) { - rn_hi = max; - SETQ; - } else if (rn_hi < min) { - rn_hi = min; - SETQ; - } - - state->Reg[rd_idx] = (rn_lo & 0xFFFF) | ((rn_hi & 0xFFFF) << 16); - return 1; - } + printf("Unhandled v6 insn: pkh/sxtab/selsxtb\n"); + break; - default: - break; - } + case 0x6a: // SSAT, SSAT16, SXTB, and SXTAB + { + const u8 op2 = BITS(5, 7); + + // SSAT16 + if (op2 == 0x01) { + const u8 rd_idx = BITS(12, 15); + const u8 rn_idx = BITS(0, 3); + const u8 num_bits = BITS(16, 19) + 1; + const s16 min = -(0x8000 >> (16 - num_bits)); + const s16 max = (0x7FFF >> (16 - num_bits)); + s16 rn_lo = (state->Reg[rn_idx]); + s16 rn_hi = (state->Reg[rn_idx] >> 16); - if (ror == -1) { - if (BITS(4, 6) == 0x7) { - printf("Unhandled v6 insn: ssat\n"); - return 0; + if (rn_lo > max) { + rn_lo = max; + SETQ; + } else if (rn_lo < min) { + rn_lo = min; + SETQ; } - break; - } - Rm = ((state->Reg[BITS(0, 3)] >> ror) & 0xFF) | (((state->Reg[BITS(0, 3)] << (32 - ror)) & 0xFF) & 0xFF); - if (Rm & 0x80) - Rm |= 0xffffff00; + if (rn_hi > max) { + rn_hi = max; + SETQ; + } else if (rn_hi < min) { + rn_hi = min; + SETQ; + } - if (BITS(16, 19) == 0xf) - /* SXTB */ - state->Reg[BITS(12, 15)] = Rm; - else - /* SXTAB */ - state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + Rm; + state->Reg[rd_idx] = (rn_lo & 0xFFFF) | ((rn_hi & 0xFFFF) << 16); + return 1; + } + else if (op2 == 0x03) { + const u8 rotation = BITS(10, 11) * 8; + u32 rm = ((state->Reg[BITS(0, 3)] >> rotation) & 0xFF) | (((state->Reg[BITS(0, 3)] << (32 - rotation)) & 0xFF) & 0xFF); + if (rm & 0x80) + rm |= 0xffffff00; + + // SXTB, otherwise SXTAB + if (BITS(16, 19) == 0xf) + state->Reg[BITS(12, 15)] = rm; + else + state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + rm; - return 1; + return 1; + } + else { + printf("Unimplemented op: SSAT"); + } } + break; case 0x6b: // REV, REV16, SXTH, and SXTAH { |