diff options
Diffstat (limited to 'src/core/arm/interpreter')
| -rw-r--r-- | src/core/arm/interpreter/armemu.cpp | 67 | ||||
| -rw-r--r-- | src/core/arm/interpreter/armsupp.cpp | 41 |
2 files changed, 89 insertions, 19 deletions
diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp index 9b680c1e2..5d26456c7 100644 --- a/src/core/arm/interpreter/armemu.cpp +++ b/src/core/arm/interpreter/armemu.cpp @@ -6117,26 +6117,55 @@ L_stm_s_takeabort: } printf("Unhandled v6 insn: uasx/usax\n"); break; - case 0x66: - if ((instr & 0x0FF00FF0) == 0x06600FF0) { //uqsub8 - u32 rd = (instr >> 12) & 0xF; - u32 rm = (instr >> 16) & 0xF; - u32 rn = (instr >> 0) & 0xF; - u32 subfrom = state->Reg[rm]; - u32 tosub = state->Reg[rn]; - - u8 b1 = (u8)((u8)(subfrom)-(u8)(tosub)); - if (b1 > (u8)(subfrom)) b1 = 0; - u8 b2 = (u8)((u8)(subfrom >> 8) - (u8)(tosub >> 8)); - if (b2 > (u8)(subfrom >> 8)) b2 = 0; - u8 b3 = (u8)((u8)(subfrom >> 16) - (u8)(tosub >> 16)); - if (b3 > (u8)(subfrom >> 16)) b3 = 0; - u8 b4 = (u8)((u8)(subfrom >> 24) - (u8)(tosub >> 24)); - if (b4 > (u8)(subfrom >> 24)) b4 = 0; - state->Reg[rd] = (u32)(b1 | b2 << 8 | b3 << 16 | b4 << 24); + case 0x66: // UQADD16, UQASX, UQSAX, UQSUB16, UQADD8, and UQSUB8 + { + const u8 rd_idx = BITS(12, 15); + const u8 rm_idx = BITS(0, 3); + const u8 rn_idx = BITS(16, 19); + const u8 op2 = BITS(5, 7); + const u32 rm_val = state->Reg[rm_idx]; + const u32 rn_val = state->Reg[rn_idx]; + + u16 lo_val = 0; + u16 hi_val = 0; + + // UQADD16 + if (op2 == 0x00) { + lo_val = ARMul_UnsignedSaturatedAdd16(rn_val & 0xFFFF, rm_val & 0xFFFF); + hi_val = ARMul_UnsignedSaturatedAdd16((rn_val >> 16) & 0xFFFF, (rm_val >> 16) & 0xFFFF); + } + // UQASX + else if (op2 == 0x01) { + lo_val = ARMul_UnsignedSaturatedSub16(rn_val & 0xFFFF, (rm_val >> 16) & 0xFFFF); + hi_val = ARMul_UnsignedSaturatedAdd16((rn_val >> 16) & 0xFFFF, rm_val & 0xFFFF); + } + // UQSAX + else if (op2 == 0x02) { + lo_val = ARMul_UnsignedSaturatedAdd16(rn_val & 0xFFFF, (rm_val >> 16) & 0xFFFF); + hi_val = ARMul_UnsignedSaturatedSub16((rn_val >> 16) & 0xFFFF, rm_val & 0xFFFF); + } + // UQSUB16 + else if (op2 == 0x03) { + lo_val = ARMul_UnsignedSaturatedSub16(rn_val & 0xFFFF, rm_val & 0xFFFF); + hi_val = ARMul_UnsignedSaturatedSub16((rn_val >> 16) & 0xFFFF, (rm_val >> 16) & 0xFFFF); + } + // UQADD8 + else if (op2 == 0x04) { + lo_val = ARMul_UnsignedSaturatedAdd8(rn_val, rm_val) | + ARMul_UnsignedSaturatedAdd8(rn_val >> 8, rm_val >> 8) << 8; + hi_val = ARMul_UnsignedSaturatedAdd8(rn_val >> 16, rm_val >> 16) | + ARMul_UnsignedSaturatedAdd8(rn_val >> 24, rm_val >> 24) << 8; + } + // UQSUB8 + else { + lo_val = ARMul_UnsignedSaturatedSub8(rn_val, rm_val) | + ARMul_UnsignedSaturatedSub8(rn_val >> 8, rm_val >> 8) << 8; + hi_val = ARMul_UnsignedSaturatedSub8(rn_val >> 16, rm_val >> 16) | + ARMul_UnsignedSaturatedSub8(rn_val >> 24, rm_val >> 24) << 8; + } + + state->Reg[rd_idx] = ((lo_val & 0xFFFF) | hi_val << 16); return 1; - } else { - printf ("Unhandled v6 insn: uqsub16\n"); } break; case 0x67: // UHADD16, UHASX, UHSAX, UHSUB16, UHADD8, and UHSUB8. diff --git a/src/core/arm/interpreter/armsupp.cpp b/src/core/arm/interpreter/armsupp.cpp index 6774f8a74..186b1bd73 100644 --- a/src/core/arm/interpreter/armsupp.cpp +++ b/src/core/arm/interpreter/armsupp.cpp @@ -469,6 +469,47 @@ ARMul_SubOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result) ASSIGNV (SubOverflow (a, b, result)); } +/* 8-bit unsigned saturated addition */ +u8 ARMul_UnsignedSaturatedAdd8(u8 left, u8 right) +{ + u8 result = left + right; + + if (result < left) + result = 0xFF; + + return result; +} + +/* 16-bit unsigned saturated addition */ +u16 ARMul_UnsignedSaturatedAdd16(u16 left, u16 right) +{ + u16 result = left + right; + + if (result < left) + result = 0xFFFF; + + return result; +} + +/* 8-bit unsigned saturated subtraction */ +u8 ARMul_UnsignedSaturatedSub8(u8 left, u8 right) +{ + if (left <= right) + return 0; + + return left - right; +} + +/* 16-bit unsigned saturated subtraction */ +u16 ARMul_UnsignedSaturatedSub16(u16 left, u16 right) +{ + if (left <= right) + return 0; + + return left - right; +} + + /* This function does the work of generating the addresses used in an LDC instruction. The code here is always post-indexed, it's up to the caller to get the input address correct and to handle base register |