| /* This file is part of SIS (SPARC instruction simulator) |
| |
| Copyright (C) 1995-2023 Free Software Foundation, Inc. |
| Contributed by Jiri Gaisler, European Space Agency |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| /* This must come before any other includes. */ |
| #include "defs.h" |
| |
| #include "sis.h" |
| #include <math.h> |
| #include <stdio.h> |
| |
| extern int32_t sis_verbose, sparclite; |
| int ext_irl = 0; |
| |
| /* Load/store interlock delay */ |
| #define FLSTHOLD 1 |
| |
| /* Load delay (delete if unwanted - speeds up simulation) */ |
| #define LOAD_DEL 1 |
| |
| #define T_LD 2 |
| #define T_LDD 3 |
| #define T_ST 3 |
| #define T_STD 4 |
| #define T_LDST 4 |
| #define T_JMPL 2 |
| #define T_RETT 2 |
| |
| #define FSR_QNE 0x2000 |
| #define FP_EXE_MODE 0 |
| #define FP_EXC_PE 1 |
| #define FP_EXC_MODE 2 |
| |
| #define FBA 8 |
| #define FBN 0 |
| #define FBNE 1 |
| #define FBLG 2 |
| #define FBUL 3 |
| #define FBL 4 |
| #define FBUG 5 |
| #define FBG 6 |
| #define FBU 7 |
| #define FBA 8 |
| #define FBE 9 |
| #define FBUE 10 |
| #define FBGE 11 |
| #define FBUGE 12 |
| #define FBLE 13 |
| #define FBULE 14 |
| #define FBO 15 |
| |
| #define FCC_E 0 |
| #define FCC_L 1 |
| #define FCC_G 2 |
| #define FCC_U 3 |
| |
| #define PSR_ET 0x20 |
| #define PSR_EF 0x1000 |
| #define PSR_PS 0x40 |
| #define PSR_S 0x80 |
| #define PSR_N 0x0800000 |
| #define PSR_Z 0x0400000 |
| #define PSR_V 0x0200000 |
| #define PSR_C 0x0100000 |
| #define PSR_CC 0x0F00000 |
| #define PSR_CWP 0x7 |
| #define PSR_PIL 0x0f00 |
| |
| #define ICC_N (icc >> 3) |
| #define ICC_Z (icc >> 2) |
| #define ICC_V (icc >> 1) |
| #define ICC_C (icc) |
| |
| #define FP_PRES (sregs->fpu_pres) |
| |
| #define TRAP_IEXC 1 |
| #define TRAP_UNIMP 2 |
| #define TRAP_PRIVI 3 |
| #define TRAP_FPDIS 4 |
| #define TRAP_WOFL 5 |
| #define TRAP_WUFL 6 |
| #define TRAP_UNALI 7 |
| #define TRAP_FPEXC 8 |
| #define TRAP_DEXC 9 |
| #define TRAP_TAG 10 |
| #define TRAP_DIV0 0x2a |
| |
| #define FSR_TT 0x1C000 |
| #define FP_IEEE 0x04000 |
| #define FP_UNIMP 0x0C000 |
| #define FP_SEQ_ERR 0x10000 |
| |
| #define BICC_BN 0 |
| #define BICC_BE 1 |
| #define BICC_BLE 2 |
| #define BICC_BL 3 |
| #define BICC_BLEU 4 |
| #define BICC_BCS 5 |
| #define BICC_NEG 6 |
| #define BICC_BVS 7 |
| #define BICC_BA 8 |
| #define BICC_BNE 9 |
| #define BICC_BG 10 |
| #define BICC_BGE 11 |
| #define BICC_BGU 12 |
| #define BICC_BCC 13 |
| #define BICC_POS 14 |
| #define BICC_BVC 15 |
| |
| #define INST_SIMM13 0x1fff |
| #define INST_RS2 0x1f |
| #define INST_I 0x2000 |
| #define ADD 0x00 |
| #define ADDCC 0x10 |
| #define ADDX 0x08 |
| #define ADDXCC 0x18 |
| #define TADDCC 0x20 |
| #define TSUBCC 0x21 |
| #define TADDCCTV 0x22 |
| #define TSUBCCTV 0x23 |
| #define IAND 0x01 |
| #define IANDCC 0x11 |
| #define IANDN 0x05 |
| #define IANDNCC 0x15 |
| #define MULScc 0x24 |
| #define DIVScc 0x1D |
| #define SMUL 0x0B |
| #define SMULCC 0x1B |
| #define UMUL 0x0A |
| #define UMULCC 0x1A |
| #define SDIV 0x0F |
| #define SDIVCC 0x1F |
| #define UDIV 0x0E |
| #define UDIVCC 0x1E |
| #define IOR 0x02 |
| #define IORCC 0x12 |
| #define IORN 0x06 |
| #define IORNCC 0x16 |
| #define SLL 0x25 |
| #define SRA 0x27 |
| #define SRL 0x26 |
| #define SUB 0x04 |
| #define SUBCC 0x14 |
| #define SUBX 0x0C |
| #define SUBXCC 0x1C |
| #define IXNOR 0x07 |
| #define IXNORCC 0x17 |
| #define IXOR 0x03 |
| #define IXORCC 0x13 |
| #define SETHI 0x04 |
| #define BICC 0x02 |
| #define FPBCC 0x06 |
| #define RDY 0x28 |
| #define RDPSR 0x29 |
| #define RDWIM 0x2A |
| #define RDTBR 0x2B |
| #define SCAN 0x2C |
| #define WRY 0x30 |
| #define WRPSR 0x31 |
| #define WRWIM 0x32 |
| #define WRTBR 0x33 |
| #define JMPL 0x38 |
| #define RETT 0x39 |
| #define TICC 0x3A |
| #define SAVE 0x3C |
| #define RESTORE 0x3D |
| #define LDD 0x03 |
| #define LDDA 0x13 |
| #define LD 0x00 |
| #define LDA 0x10 |
| #define LDF 0x20 |
| #define LDDF 0x23 |
| #define LDSTUB 0x0D |
| #define LDSTUBA 0x1D |
| #define LDUB 0x01 |
| #define LDUBA 0x11 |
| #define LDSB 0x09 |
| #define LDSBA 0x19 |
| #define LDUH 0x02 |
| #define LDUHA 0x12 |
| #define LDSH 0x0A |
| #define LDSHA 0x1A |
| #define LDFSR 0x21 |
| #define ST 0x04 |
| #define STA 0x14 |
| #define STB 0x05 |
| #define STBA 0x15 |
| #define STD 0x07 |
| #define STDA 0x17 |
| #define STF 0x24 |
| #define STDFQ 0x26 |
| #define STDF 0x27 |
| #define STFSR 0x25 |
| #define STH 0x06 |
| #define STHA 0x16 |
| #define SWAP 0x0F |
| #define SWAPA 0x1F |
| #define FLUSH 0x3B |
| |
| #define SIGN_BIT 0x80000000 |
| |
| /* # of cycles overhead when a trap is taken */ |
| #define TRAP_C 3 |
| |
| /* Forward declarations */ |
| |
| static uint32_t sub_cc (uint32_t psr, int32_t operand1, int32_t operand2, |
| int32_t result); |
| static uint32_t add_cc (uint32_t psr, int32_t operand1, int32_t operand2, |
| int32_t result); |
| static void log_cc (int32_t result, struct pstate *sregs); |
| static int fpexec (uint32_t op3, uint32_t rd, uint32_t rs1, uint32_t rs2, |
| struct pstate *sregs); |
| static int chk_asi (struct pstate *sregs, uint32_t *asi, uint32_t op3); |
| |
| |
| extern struct estate ebase; |
| extern int32_t nfp,ift; |
| |
| #ifdef ERRINJ |
| extern uint32_t errtt, errftt; |
| #endif |
| |
| static uint32_t |
| sub_cc(uint32_t psr, int32_t operand1, int32_t operand2, int32_t result) |
| { |
| psr = ((psr & ~PSR_N) | ((result >> 8) & PSR_N)); |
| if (result) |
| psr &= ~PSR_Z; |
| else |
| psr |= PSR_Z; |
| psr = (psr & ~PSR_V) | ((((operand1 & ~operand2 & ~result) | |
| (~operand1 & operand2 & result)) >> 10) & PSR_V); |
| psr = (psr & ~PSR_C) | ((((~operand1 & operand2) | |
| ((~operand1 | operand2) & result)) >> 11) & PSR_C); |
| return psr; |
| } |
| |
| uint32_t |
| add_cc(uint32_t psr, int32_t operand1, int32_t operand2, int32_t result) |
| { |
| psr = ((psr & ~PSR_N) | ((result >> 8) & PSR_N)); |
| if (result) |
| psr &= ~PSR_Z; |
| else |
| psr |= PSR_Z; |
| psr = (psr & ~PSR_V) | ((((operand1 & operand2 & ~result) | |
| (~operand1 & ~operand2 & result)) >> 10) & PSR_V); |
| psr = (psr & ~PSR_C) | ((((operand1 & operand2) | |
| ((operand1 | operand2) & ~result)) >> 11) & PSR_C); |
| return psr; |
| } |
| |
| static void |
| log_cc(int32_t result, struct pstate *sregs) |
| { |
| sregs->psr &= ~(PSR_CC); /* Zero CC bits */ |
| sregs->psr = (sregs->psr | ((result >> 8) & PSR_N)); |
| if (result == 0) |
| sregs->psr |= PSR_Z; |
| } |
| |
| /* Add two unsigned 32-bit integers, and calculate the carry out. */ |
| |
| static uint32_t |
| add32 (uint32_t n1, uint32_t n2, int *carry) |
| { |
| uint32_t result = n1 + n2; |
| |
| *carry = result < n1 || result < n2; |
| return result; |
| } |
| |
| /* Multiply two 32-bit integers. */ |
| |
| static void |
| mul64 (uint32_t n1, uint32_t n2, uint32_t *result_hi, uint32_t *result_lo, int msigned) |
| { |
| uint32_t lo, mid1, mid2, hi, reg_lo, reg_hi; |
| int carry; |
| int sign = 0; |
| |
| /* If this is a signed multiply, calculate the sign of the result |
| and make the operands positive. */ |
| if (msigned) |
| { |
| sign = (n1 ^ n2) & SIGN_BIT; |
| if (n1 & SIGN_BIT) |
| n1 = -n1; |
| if (n2 & SIGN_BIT) |
| n2 = -n2; |
| |
| } |
| |
| /* We can split the 32x32 into four 16x16 operations. This ensures |
| that we do not lose precision on 32bit only hosts: */ |
| lo = ((n1 & 0xFFFF) * (n2 & 0xFFFF)); |
| mid1 = ((n1 & 0xFFFF) * ((n2 >> 16) & 0xFFFF)); |
| mid2 = (((n1 >> 16) & 0xFFFF) * (n2 & 0xFFFF)); |
| hi = (((n1 >> 16) & 0xFFFF) * ((n2 >> 16) & 0xFFFF)); |
| |
| /* We now need to add all of these results together, taking care |
| to propogate the carries from the additions: */ |
| reg_lo = add32 (lo, (mid1 << 16), &carry); |
| reg_hi = carry; |
| reg_lo = add32 (reg_lo, (mid2 << 16), &carry); |
| reg_hi += (carry + ((mid1 >> 16) & 0xFFFF) + ((mid2 >> 16) & 0xFFFF) + hi); |
| |
| /* Negate result if necessary. */ |
| if (sign) |
| { |
| reg_hi = ~ reg_hi; |
| reg_lo = - reg_lo; |
| if (reg_lo == 0) |
| reg_hi++; |
| } |
| |
| *result_lo = reg_lo; |
| *result_hi = reg_hi; |
| } |
| |
| |
| /* Divide a 64-bit integer by a 32-bit integer. We cheat and assume |
| that the host compiler supports long long operations. */ |
| |
| static void |
| div64 (uint32_t n1_hi, uint32_t n1_low, uint32_t n2, uint32_t *result, int msigned) |
| { |
| uint64_t n1; |
| |
| n1 = ((uint64_t) n1_hi) << 32; |
| n1 |= ((uint64_t) n1_low) & 0xffffffff; |
| |
| if (msigned) |
| { |
| int64_t n1_s = (int64_t) n1; |
| int32_t n2_s = (int32_t) n2; |
| n1_s = n1_s / n2_s; |
| n1 = (uint64_t) n1_s; |
| } |
| else |
| n1 = n1 / n2; |
| |
| *result = (uint32_t) (n1 & 0xffffffff); |
| } |
| |
| |
| static int |
| extract_short (uint32_t data, uint32_t address) |
| { |
| return ((data >> ((2 - (address & 2)) * 8)) & 0xffff); |
| } |
| |
| static int |
| extract_short_signed (uint32_t data, uint32_t address) |
| { |
| uint32_t tmp = ((data >> ((2 - (address & 2)) * 8)) & 0xffff); |
| if (tmp & 0x8000) |
| tmp |= 0xffff0000; |
| return tmp; |
| } |
| |
| static int |
| extract_byte (uint32_t data, uint32_t address) |
| { |
| return ((data >> ((3 - (address & 3)) * 8)) & 0xff); |
| } |
| |
| static int |
| extract_byte_signed (uint32_t data, uint32_t address) |
| { |
| uint32_t tmp = ((data >> ((3 - (address & 3)) * 8)) & 0xff); |
| if (tmp & 0x80) |
| tmp |= 0xffffff00; |
| return tmp; |
| } |
| |
| int |
| dispatch_instruction(struct pstate *sregs) |
| { |
| |
| uint32_t cwp, op, op2, op3, asi, rd, cond, rs1, |
| rs2; |
| uint32_t ldep, icc, data, *rdd; |
| int32_t operand1, operand2, result, eicc, |
| new_cwp; |
| int32_t pc, npc, address, ws, mexc, fcc; |
| uint32_t ddata[2]; |
| |
| sregs->ninst++; |
| cwp = ((sregs->psr & PSR_CWP) << 4); |
| op = sregs->inst >> 30; |
| pc = sregs->npc; |
| npc = sregs->npc + 4; |
| op3 = rd = rs1 = operand2 = eicc = 0; |
| rdd = 0; |
| if (op & 2) { |
| |
| op3 = (sregs->inst >> 19) & 0x3f; |
| rs1 = (sregs->inst >> 14) & 0x1f; |
| rd = (sregs->inst >> 25) & 0x1f; |
| |
| #ifdef LOAD_DEL |
| |
| /* Check if load dependecy is possible */ |
| if (ebase.simtime <= sregs->ildtime) |
| ldep = (((op3 & 0x38) != 0x28) && ((op3 & 0x3e) != 0x34) && (sregs->ildreg != 0)); |
| else |
| ldep = 0; |
| if (sregs->inst & INST_I) { |
| if (ldep && (sregs->ildreg == rs1)) |
| sregs->hold++; |
| operand2 = sregs->inst; |
| operand2 = ((operand2 << 19) >> 19); /* sign extend */ |
| } else { |
| rs2 = sregs->inst & INST_RS2; |
| if (rs2 > 7) |
| operand2 = sregs->r[(cwp + rs2) & 0x7f]; |
| else |
| operand2 = sregs->g[rs2]; |
| if (ldep && ((sregs->ildreg == rs1) || (sregs->ildreg == rs2))) |
| sregs->hold++; |
| } |
| #else |
| if (sregs->inst & INST_I) { |
| operand2 = sregs->inst; |
| operand2 = ((operand2 << 19) >> 19); /* sign extend */ |
| } else { |
| rs2 = sregs->inst & INST_RS2; |
| if (rs2 > 7) |
| operand2 = sregs->r[(cwp + rs2) & 0x7f]; |
| else |
| operand2 = sregs->g[rs2]; |
| } |
| #endif |
| |
| if (rd > 7) |
| rdd = &(sregs->r[(cwp + rd) & 0x7f]); |
| else |
| rdd = &(sregs->g[rd]); |
| if (rs1 > 7) |
| rs1 = sregs->r[(cwp + rs1) & 0x7f]; |
| else |
| rs1 = sregs->g[rs1]; |
| } |
| switch (op) { |
| case 0: |
| op2 = (sregs->inst >> 22) & 0x7; |
| switch (op2) { |
| case SETHI: |
| rd = (sregs->inst >> 25) & 0x1f; |
| if (rd > 7) |
| rdd = &(sregs->r[(cwp + rd) & 0x7f]); |
| else |
| rdd = &(sregs->g[rd]); |
| *rdd = sregs->inst << 10; |
| break; |
| case BICC: |
| #ifdef STAT |
| sregs->nbranch++; |
| #endif |
| icc = sregs->psr >> 20; |
| cond = ((sregs->inst >> 25) & 0x0f); |
| switch (cond) { |
| case BICC_BN: |
| eicc = 0; |
| break; |
| case BICC_BE: |
| eicc = ICC_Z; |
| break; |
| case BICC_BLE: |
| eicc = ICC_Z | (ICC_N ^ ICC_V); |
| break; |
| case BICC_BL: |
| eicc = (ICC_N ^ ICC_V); |
| break; |
| case BICC_BLEU: |
| eicc = ICC_C | ICC_Z; |
| break; |
| case BICC_BCS: |
| eicc = ICC_C; |
| break; |
| case BICC_NEG: |
| eicc = ICC_N; |
| break; |
| case BICC_BVS: |
| eicc = ICC_V; |
| break; |
| case BICC_BA: |
| eicc = 1; |
| if (sregs->inst & 0x20000000) |
| sregs->annul = 1; |
| break; |
| case BICC_BNE: |
| eicc = ~(ICC_Z); |
| break; |
| case BICC_BG: |
| eicc = ~(ICC_Z | (ICC_N ^ ICC_V)); |
| break; |
| case BICC_BGE: |
| eicc = ~(ICC_N ^ ICC_V); |
| break; |
| case BICC_BGU: |
| eicc = ~(ICC_C | ICC_Z); |
| break; |
| case BICC_BCC: |
| eicc = ~(ICC_C); |
| break; |
| case BICC_POS: |
| eicc = ~(ICC_N); |
| break; |
| case BICC_BVC: |
| eicc = ~(ICC_V); |
| break; |
| } |
| if (eicc & 1) { |
| operand1 = sregs->inst; |
| operand1 = ((operand1 << 10) >> 8); /* sign extend */ |
| npc = sregs->pc + operand1; |
| } else { |
| if (sregs->inst & 0x20000000) |
| sregs->annul = 1; |
| } |
| break; |
| case FPBCC: |
| #ifdef STAT |
| sregs->nbranch++; |
| #endif |
| if (!((sregs->psr & PSR_EF) && FP_PRES)) { |
| sregs->trap = TRAP_FPDIS; |
| break; |
| } |
| if (ebase.simtime < sregs->ftime) { |
| sregs->ftime = ebase.simtime + sregs->hold; |
| } |
| cond = ((sregs->inst >> 25) & 0x0f); |
| fcc = (sregs->fsr >> 10) & 0x3; |
| switch (cond) { |
| case FBN: |
| eicc = 0; |
| break; |
| case FBNE: |
| eicc = (fcc != FCC_E); |
| break; |
| case FBLG: |
| eicc = (fcc == FCC_L) || (fcc == FCC_G); |
| break; |
| case FBUL: |
| eicc = (fcc == FCC_L) || (fcc == FCC_U); |
| break; |
| case FBL: |
| eicc = (fcc == FCC_L); |
| break; |
| case FBUG: |
| eicc = (fcc == FCC_G) || (fcc == FCC_U); |
| break; |
| case FBG: |
| eicc = (fcc == FCC_G); |
| break; |
| case FBU: |
| eicc = (fcc == FCC_U); |
| break; |
| case FBA: |
| eicc = 1; |
| if (sregs->inst & 0x20000000) |
| sregs->annul = 1; |
| break; |
| case FBE: |
| eicc = !(fcc != FCC_E); |
| break; |
| case FBUE: |
| eicc = !((fcc == FCC_L) || (fcc == FCC_G)); |
| break; |
| case FBGE: |
| eicc = !((fcc == FCC_L) || (fcc == FCC_U)); |
| break; |
| case FBUGE: |
| eicc = !(fcc == FCC_L); |
| break; |
| case FBLE: |
| eicc = !((fcc == FCC_G) || (fcc == FCC_U)); |
| break; |
| case FBULE: |
| eicc = !(fcc == FCC_G); |
| break; |
| case FBO: |
| eicc = !(fcc == FCC_U); |
| break; |
| } |
| if (eicc) { |
| operand1 = sregs->inst; |
| operand1 = ((operand1 << 10) >> 8); /* sign extend */ |
| npc = sregs->pc + operand1; |
| } else { |
| if (sregs->inst & 0x20000000) |
| sregs->annul = 1; |
| } |
| break; |
| |
| default: |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| break; |
| case 1: /* CALL */ |
| #ifdef STAT |
| sregs->nbranch++; |
| #endif |
| sregs->r[(cwp + 15) & 0x7f] = sregs->pc; |
| npc = sregs->pc + (sregs->inst << 2); |
| break; |
| |
| case 2: |
| if ((op3 >> 1) == 0x1a) { |
| if (!((sregs->psr & PSR_EF) && FP_PRES)) { |
| sregs->trap = TRAP_FPDIS; |
| } else { |
| rs1 = (sregs->inst >> 14) & 0x1f; |
| rs2 = sregs->inst & 0x1f; |
| sregs->trap = fpexec(op3, rd, rs1, rs2, sregs); |
| } |
| } else { |
| |
| switch (op3) { |
| case TICC: |
| icc = sregs->psr >> 20; |
| cond = ((sregs->inst >> 25) & 0x0f); |
| switch (cond) { |
| case BICC_BN: |
| eicc = 0; |
| break; |
| case BICC_BE: |
| eicc = ICC_Z; |
| break; |
| case BICC_BLE: |
| eicc = ICC_Z | (ICC_N ^ ICC_V); |
| break; |
| case BICC_BL: |
| eicc = (ICC_N ^ ICC_V); |
| break; |
| case BICC_BLEU: |
| eicc = ICC_C | ICC_Z; |
| break; |
| case BICC_BCS: |
| eicc = ICC_C; |
| break; |
| case BICC_NEG: |
| eicc = ICC_N; |
| break; |
| case BICC_BVS: |
| eicc = ICC_V; |
| break; |
| case BICC_BA: |
| eicc = 1; |
| break; |
| case BICC_BNE: |
| eicc = ~(ICC_Z); |
| break; |
| case BICC_BG: |
| eicc = ~(ICC_Z | (ICC_N ^ ICC_V)); |
| break; |
| case BICC_BGE: |
| eicc = ~(ICC_N ^ ICC_V); |
| break; |
| case BICC_BGU: |
| eicc = ~(ICC_C | ICC_Z); |
| break; |
| case BICC_BCC: |
| eicc = ~(ICC_C); |
| break; |
| case BICC_POS: |
| eicc = ~(ICC_N); |
| break; |
| case BICC_BVC: |
| eicc = ~(ICC_V); |
| break; |
| } |
| if (eicc & 1) { |
| sregs->trap = (0x80 | ((rs1 + operand2) & 0x7f)); |
| } |
| break; |
| |
| case MULScc: |
| operand1 = |
| (((sregs->psr & PSR_V) ^ ((sregs->psr & PSR_N) >> 2)) |
| << 10) | (rs1 >> 1); |
| if ((sregs->y & 1) == 0) |
| operand2 = 0; |
| *rdd = operand1 + operand2; |
| sregs->y = (rs1 << 31) | (sregs->y >> 1); |
| sregs->psr = add_cc(sregs->psr, operand1, operand2, *rdd); |
| break; |
| case DIVScc: |
| { |
| int sign; |
| uint32_t result, remainder; |
| int c0, y31; |
| |
| if (!sparclite) { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| |
| sign = ((sregs->psr & PSR_V) != 0) ^ ((sregs->psr & PSR_N) != 0); |
| |
| remainder = (sregs->y << 1) | (rs1 >> 31); |
| |
| /* If true sign is positive, calculate remainder - divisor. |
| Otherwise, calculate remainder + divisor. */ |
| if (sign == 0) |
| operand2 = ~operand2 + 1; |
| result = remainder + operand2; |
| |
| /* The SPARClite User's Manual is not clear on how |
| the "carry out" of the above ALU operation is to |
| be calculated. From trial and error tests |
| on the the chip itself, it appears that it is |
| a normal addition carry, and not a subtraction borrow, |
| even in cases where the divisor is subtracted |
| from the remainder. FIXME: get the true story |
| from Fujitsu. */ |
| c0 = result < (uint32_t) remainder |
| || result < (uint32_t) operand2; |
| |
| if (result & 0x80000000) |
| sregs->psr |= PSR_N; |
| else |
| sregs->psr &= ~PSR_N; |
| |
| y31 = (sregs->y & 0x80000000) == 0x80000000; |
| |
| if (result == 0 && sign == y31) |
| sregs->psr |= PSR_Z; |
| else |
| sregs->psr &= ~PSR_Z; |
| |
| sign = (sign && !y31) || (!c0 && (sign || !y31)); |
| |
| if (sign ^ (result >> 31)) |
| sregs->psr |= PSR_V; |
| else |
| sregs->psr &= ~PSR_V; |
| |
| if (!sign) |
| sregs->psr |= PSR_C; |
| else |
| sregs->psr &= ~PSR_C; |
| |
| sregs->y = result; |
| |
| if (rd != 0) |
| *rdd = (rs1 << 1) | !sign; |
| } |
| break; |
| case SMUL: |
| { |
| mul64 (rs1, operand2, &sregs->y, rdd, 1); |
| } |
| break; |
| case SMULCC: |
| { |
| uint32_t result; |
| |
| mul64 (rs1, operand2, &sregs->y, &result, 1); |
| |
| if (result & 0x80000000) |
| sregs->psr |= PSR_N; |
| else |
| sregs->psr &= ~PSR_N; |
| |
| if (result == 0) |
| sregs->psr |= PSR_Z; |
| else |
| sregs->psr &= ~PSR_Z; |
| |
| *rdd = result; |
| } |
| break; |
| case UMUL: |
| { |
| mul64 (rs1, operand2, &sregs->y, rdd, 0); |
| } |
| break; |
| case UMULCC: |
| { |
| uint32_t result; |
| |
| mul64 (rs1, operand2, &sregs->y, &result, 0); |
| |
| if (result & 0x80000000) |
| sregs->psr |= PSR_N; |
| else |
| sregs->psr &= ~PSR_N; |
| |
| if (result == 0) |
| sregs->psr |= PSR_Z; |
| else |
| sregs->psr &= ~PSR_Z; |
| |
| *rdd = result; |
| } |
| break; |
| case SDIV: |
| { |
| if (sparclite) { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| |
| if (operand2 == 0) { |
| sregs->trap = TRAP_DIV0; |
| break; |
| } |
| |
| div64 (sregs->y, rs1, operand2, rdd, 1); |
| } |
| break; |
| case SDIVCC: |
| { |
| uint32_t result; |
| |
| if (sparclite) { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| |
| if (operand2 == 0) { |
| sregs->trap = TRAP_DIV0; |
| break; |
| } |
| |
| div64 (sregs->y, rs1, operand2, &result, 1); |
| |
| if (result & 0x80000000) |
| sregs->psr |= PSR_N; |
| else |
| sregs->psr &= ~PSR_N; |
| |
| if (result == 0) |
| sregs->psr |= PSR_Z; |
| else |
| sregs->psr &= ~PSR_Z; |
| |
| /* FIXME: should set overflow flag correctly. */ |
| sregs->psr &= ~(PSR_C | PSR_V); |
| |
| *rdd = result; |
| } |
| break; |
| case UDIV: |
| { |
| if (sparclite) { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| |
| if (operand2 == 0) { |
| sregs->trap = TRAP_DIV0; |
| break; |
| } |
| |
| div64 (sregs->y, rs1, operand2, rdd, 0); |
| } |
| break; |
| case UDIVCC: |
| { |
| uint32_t result; |
| |
| if (sparclite) { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| |
| if (operand2 == 0) { |
| sregs->trap = TRAP_DIV0; |
| break; |
| } |
| |
| div64 (sregs->y, rs1, operand2, &result, 0); |
| |
| if (result & 0x80000000) |
| sregs->psr |= PSR_N; |
| else |
| sregs->psr &= ~PSR_N; |
| |
| if (result == 0) |
| sregs->psr |= PSR_Z; |
| else |
| sregs->psr &= ~PSR_Z; |
| |
| /* FIXME: should set overflow flag correctly. */ |
| sregs->psr &= ~(PSR_C | PSR_V); |
| |
| *rdd = result; |
| } |
| break; |
| case IXNOR: |
| *rdd = rs1 ^ ~operand2; |
| break; |
| case IXNORCC: |
| *rdd = rs1 ^ ~operand2; |
| log_cc(*rdd, sregs); |
| break; |
| case IXOR: |
| *rdd = rs1 ^ operand2; |
| break; |
| case IXORCC: |
| *rdd = rs1 ^ operand2; |
| log_cc(*rdd, sregs); |
| break; |
| case IOR: |
| *rdd = rs1 | operand2; |
| break; |
| case IORCC: |
| *rdd = rs1 | operand2; |
| log_cc(*rdd, sregs); |
| break; |
| case IORN: |
| *rdd = rs1 | ~operand2; |
| break; |
| case IORNCC: |
| *rdd = rs1 | ~operand2; |
| log_cc(*rdd, sregs); |
| break; |
| case IANDNCC: |
| *rdd = rs1 & ~operand2; |
| log_cc(*rdd, sregs); |
| break; |
| case IANDN: |
| *rdd = rs1 & ~operand2; |
| break; |
| case IAND: |
| *rdd = rs1 & operand2; |
| break; |
| case IANDCC: |
| *rdd = rs1 & operand2; |
| log_cc(*rdd, sregs); |
| break; |
| case SUB: |
| *rdd = rs1 - operand2; |
| break; |
| case SUBCC: |
| *rdd = rs1 - operand2; |
| sregs->psr = sub_cc(sregs->psr, rs1, operand2, *rdd); |
| break; |
| case SUBX: |
| *rdd = rs1 - operand2 - ((sregs->psr >> 20) & 1); |
| break; |
| case SUBXCC: |
| *rdd = rs1 - operand2 - ((sregs->psr >> 20) & 1); |
| sregs->psr = sub_cc(sregs->psr, rs1, operand2, *rdd); |
| break; |
| case ADD: |
| *rdd = rs1 + operand2; |
| break; |
| case ADDCC: |
| *rdd = rs1 + operand2; |
| sregs->psr = add_cc(sregs->psr, rs1, operand2, *rdd); |
| break; |
| case ADDX: |
| *rdd = rs1 + operand2 + ((sregs->psr >> 20) & 1); |
| break; |
| case ADDXCC: |
| *rdd = rs1 + operand2 + ((sregs->psr >> 20) & 1); |
| sregs->psr = add_cc(sregs->psr, rs1, operand2, *rdd); |
| break; |
| case TADDCC: |
| *rdd = rs1 + operand2; |
| sregs->psr = add_cc(sregs->psr, rs1, operand2, *rdd); |
| if ((rs1 | operand2) & 0x3) |
| sregs->psr |= PSR_V; |
| break; |
| case TSUBCC: |
| *rdd = rs1 - operand2; |
| sregs->psr = sub_cc (sregs->psr, rs1, operand2, *rdd); |
| if ((rs1 | operand2) & 0x3) |
| sregs->psr |= PSR_V; |
| break; |
| case TADDCCTV: |
| *rdd = rs1 + operand2; |
| result = add_cc(0, rs1, operand2, *rdd); |
| if ((rs1 | operand2) & 0x3) |
| result |= PSR_V; |
| if (result & PSR_V) { |
| sregs->trap = TRAP_TAG; |
| } else { |
| sregs->psr = (sregs->psr & ~PSR_CC) | result; |
| } |
| break; |
| case TSUBCCTV: |
| *rdd = rs1 - operand2; |
| result = add_cc (0, rs1, operand2, *rdd); |
| if ((rs1 | operand2) & 0x3) |
| result |= PSR_V; |
| if (result & PSR_V) |
| { |
| sregs->trap = TRAP_TAG; |
| } |
| else |
| { |
| sregs->psr = (sregs->psr & ~PSR_CC) | result; |
| } |
| break; |
| case SLL: |
| *rdd = rs1 << (operand2 & 0x1f); |
| break; |
| case SRL: |
| *rdd = rs1 >> (operand2 & 0x1f); |
| break; |
| case SRA: |
| *rdd = ((int) rs1) >> (operand2 & 0x1f); |
| break; |
| case FLUSH: |
| if (ift) sregs->trap = TRAP_UNIMP; |
| break; |
| case SAVE: |
| new_cwp = ((sregs->psr & PSR_CWP) - 1) & PSR_CWP; |
| if (sregs->wim & (1 << new_cwp)) { |
| sregs->trap = TRAP_WOFL; |
| break; |
| } |
| if (rd > 7) |
| rdd = &(sregs->r[((new_cwp << 4) + rd) & 0x7f]); |
| *rdd = rs1 + operand2; |
| sregs->psr = (sregs->psr & ~PSR_CWP) | new_cwp; |
| break; |
| case RESTORE: |
| |
| new_cwp = ((sregs->psr & PSR_CWP) + 1) & PSR_CWP; |
| if (sregs->wim & (1 << new_cwp)) { |
| sregs->trap = TRAP_WUFL; |
| break; |
| } |
| if (rd > 7) |
| rdd = &(sregs->r[((new_cwp << 4) + rd) & 0x7f]); |
| *rdd = rs1 + operand2; |
| sregs->psr = (sregs->psr & ~PSR_CWP) | new_cwp; |
| break; |
| case RDPSR: |
| if (!(sregs->psr & PSR_S)) { |
| sregs->trap = TRAP_PRIVI; |
| break; |
| } |
| *rdd = sregs->psr; |
| break; |
| case RDY: |
| if (!sparclite) |
| *rdd = sregs->y; |
| else { |
| int rs1_is_asr = (sregs->inst >> 14) & 0x1f; |
| if ( 0 == rs1_is_asr ) |
| *rdd = sregs->y; |
| else if ( 17 == rs1_is_asr ) |
| *rdd = sregs->asr17; |
| else { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| } |
| break; |
| case RDWIM: |
| if (!(sregs->psr & PSR_S)) { |
| sregs->trap = TRAP_PRIVI; |
| break; |
| } |
| *rdd = sregs->wim; |
| break; |
| case RDTBR: |
| if (!(sregs->psr & PSR_S)) { |
| sregs->trap = TRAP_PRIVI; |
| break; |
| } |
| *rdd = sregs->tbr; |
| break; |
| case WRPSR: |
| if ((sregs->psr & 0x1f) > 7) { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| if (!(sregs->psr & PSR_S)) { |
| sregs->trap = TRAP_PRIVI; |
| break; |
| } |
| sregs->psr = (sregs->psr & 0xff000000) | |
| ((rs1 ^ operand2) & 0x00f03fff); |
| break; |
| case WRWIM: |
| if (!(sregs->psr & PSR_S)) { |
| sregs->trap = TRAP_PRIVI; |
| break; |
| } |
| sregs->wim = (rs1 ^ operand2) & 0x0ff; |
| break; |
| case WRTBR: |
| if (!(sregs->psr & PSR_S)) { |
| sregs->trap = TRAP_PRIVI; |
| break; |
| } |
| sregs->tbr = (sregs->tbr & 0x00000ff0) | |
| ((rs1 ^ operand2) & 0xfffff000); |
| break; |
| case WRY: |
| if (!sparclite) |
| sregs->y = (rs1 ^ operand2); |
| else { |
| if ( 0 == rd ) |
| sregs->y = (rs1 ^ operand2); |
| else if ( 17 == rd ) |
| sregs->asr17 = (rs1 ^ operand2); |
| else { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| } |
| break; |
| case JMPL: |
| |
| #ifdef STAT |
| sregs->nbranch++; |
| #endif |
| sregs->icnt = T_JMPL; /* JMPL takes two cycles */ |
| if (rs1 & 0x3) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| *rdd = sregs->pc; |
| npc = rs1 + operand2; |
| break; |
| case RETT: |
| address = rs1 + operand2; |
| new_cwp = ((sregs->psr & PSR_CWP) + 1) & PSR_CWP; |
| sregs->icnt = T_RETT; /* RETT takes two cycles */ |
| if (sregs->psr & PSR_ET) { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| if (!(sregs->psr & PSR_S)) { |
| sregs->trap = TRAP_PRIVI; |
| break; |
| } |
| if (sregs->wim & (1 << new_cwp)) { |
| sregs->trap = TRAP_WUFL; |
| break; |
| } |
| if (address & 0x3) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| sregs->psr = (sregs->psr & ~PSR_CWP) | new_cwp | PSR_ET; |
| sregs->psr = |
| (sregs->psr & ~PSR_S) | ((sregs->psr & PSR_PS) << 1); |
| npc = address; |
| break; |
| |
| case SCAN: |
| { |
| uint32_t result, mask; |
| int i; |
| |
| if (!sparclite) { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| mask = (operand2 & 0x80000000) | (operand2 >> 1); |
| result = rs1 ^ mask; |
| |
| for (i = 0; i < 32; i++) { |
| if (result & 0x80000000) |
| break; |
| result <<= 1; |
| } |
| |
| *rdd = i == 32 ? 63 : i; |
| } |
| break; |
| |
| default: |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| } |
| break; |
| case 3: /* Load/store instructions */ |
| |
| address = rs1 + operand2; |
| |
| if (sregs->psr & PSR_S) |
| asi = 11; |
| else |
| asi = 10; |
| |
| if (op3 & 4) { |
| sregs->icnt = T_ST; /* Set store instruction count */ |
| #ifdef STAT |
| sregs->nstore++; |
| #endif |
| } else { |
| sregs->icnt = T_LD; /* Set load instruction count */ |
| #ifdef STAT |
| sregs->nload++; |
| #endif |
| } |
| |
| /* Decode load/store instructions */ |
| |
| switch (op3) { |
| case LDDA: |
| if (!chk_asi(sregs, &asi, op3)) break; |
| case LDD: |
| if (address & 0x7) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| if (rd & 1) { |
| rd &= 0x1e; |
| if (rd > 7) |
| rdd = &(sregs->r[(cwp + rd) & 0x7f]); |
| else |
| rdd = &(sregs->g[rd]); |
| } |
| mexc = memory_read (asi, address, ddata, 2, &ws); |
| sregs->hold += ws; |
| mexc |= memory_read (asi, address+4, &ddata[1], 2, &ws); |
| sregs->hold += ws; |
| sregs->icnt = T_LDD; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } else { |
| rdd[0] = ddata[0]; |
| rdd[1] = ddata[1]; |
| #ifdef STAT |
| sregs->nload++; /* Double load counts twice */ |
| #endif |
| } |
| break; |
| |
| case LDA: |
| if (!chk_asi(sregs, &asi, op3)) break; |
| case LD: |
| if (address & 0x3) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| mexc = memory_read(asi, address, &data, 2, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } else { |
| *rdd = data; |
| } |
| break; |
| case LDSTUBA: |
| if (!chk_asi(sregs, &asi, op3)) break; |
| case LDSTUB: |
| mexc = memory_read(asi, address, &data, 0, &ws); |
| sregs->hold += ws; |
| sregs->icnt = T_LDST; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| break; |
| } |
| data = extract_byte (data, address); |
| *rdd = data; |
| data = 0x0ff; |
| mexc = memory_write(asi, address, &data, 0, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } |
| #ifdef STAT |
| sregs->nload++; |
| #endif |
| break; |
| case LDSBA: |
| case LDUBA: |
| if (!chk_asi(sregs, &asi, op3)) break; |
| case LDSB: |
| case LDUB: |
| mexc = memory_read(asi, address, &data, 0, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| break; |
| } |
| if (op3 == LDSB) |
| data = extract_byte_signed (data, address); |
| else |
| data = extract_byte (data, address); |
| *rdd = data; |
| break; |
| case LDSHA: |
| case LDUHA: |
| if (!chk_asi(sregs, &asi, op3)) break; |
| case LDSH: |
| case LDUH: |
| if (address & 0x1) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| mexc = memory_read(asi, address, &data, 1, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| break; |
| } |
| if (op3 == LDSH) |
| data = extract_short_signed (data, address); |
| else |
| data = extract_short (data, address); |
| *rdd = data; |
| break; |
| case LDF: |
| if (!((sregs->psr & PSR_EF) && FP_PRES)) { |
| sregs->trap = TRAP_FPDIS; |
| break; |
| } |
| if (address & 0x3) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| if (ebase.simtime < sregs->ftime) { |
| if ((sregs->frd == rd) || (sregs->frs1 == rd) || |
| (sregs->frs2 == rd)) |
| sregs->fhold += (sregs->ftime - ebase.simtime); |
| } |
| mexc = memory_read(asi, address, &data, 2, &ws); |
| sregs->hold += ws; |
| sregs->flrd = rd; |
| sregs->ltime = ebase.simtime + sregs->icnt + FLSTHOLD + |
| sregs->hold + sregs->fhold; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } else { |
| memcpy (&sregs->fs[rd], &data, sizeof (sregs->fs[rd])); |
| } |
| break; |
| case LDDF: |
| if (!((sregs->psr & PSR_EF) && FP_PRES)) { |
| sregs->trap = TRAP_FPDIS; |
| break; |
| } |
| if (address & 0x7) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| if (ebase.simtime < sregs->ftime) { |
| if (((sregs->frd >> 1) == (rd >> 1)) || |
| ((sregs->frs1 >> 1) == (rd >> 1)) || |
| ((sregs->frs2 >> 1) == (rd >> 1))) |
| sregs->fhold += (sregs->ftime - ebase.simtime); |
| } |
| mexc = memory_read (asi, address, ddata, 2, &ws); |
| sregs->hold += ws; |
| mexc |= memory_read (asi, address+4, &ddata[1], 2, &ws); |
| sregs->hold += ws; |
| sregs->icnt = T_LDD; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } else { |
| rd &= 0x1E; |
| sregs->flrd = rd; |
| memcpy (&sregs->fs[rd], &ddata[0], sizeof (sregs->fs[rd])); |
| #ifdef STAT |
| sregs->nload++; /* Double load counts twice */ |
| #endif |
| memcpy (&sregs->fs[rd + 1], &ddata[1], |
| sizeof (sregs->fs[rd + 1])); |
| sregs->ltime = ebase.simtime + sregs->icnt + FLSTHOLD + |
| sregs->hold + sregs->fhold; |
| } |
| break; |
| case LDFSR: |
| if (ebase.simtime < sregs->ftime) { |
| sregs->fhold += (sregs->ftime - ebase.simtime); |
| } |
| if (!((sregs->psr & PSR_EF) && FP_PRES)) { |
| sregs->trap = TRAP_FPDIS; |
| break; |
| } |
| if (address & 0x3) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| mexc = memory_read(asi, address, &data, 2, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } else { |
| sregs->fsr = |
| (sregs->fsr & 0x7FF000) | (data & ~0x7FF000); |
| set_fsr(sregs->fsr); |
| } |
| break; |
| case STFSR: |
| if (!((sregs->psr & PSR_EF) && FP_PRES)) { |
| sregs->trap = TRAP_FPDIS; |
| break; |
| } |
| if (address & 0x3) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| if (ebase.simtime < sregs->ftime) { |
| sregs->fhold += (sregs->ftime - ebase.simtime); |
| } |
| mexc = memory_write(asi, address, &sregs->fsr, 2, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } |
| break; |
| |
| case STA: |
| if (!chk_asi(sregs, &asi, op3)) break; |
| case ST: |
| if (address & 0x3) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| mexc = memory_write(asi, address, rdd, 2, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } |
| break; |
| case STBA: |
| if (!chk_asi(sregs, &asi, op3)) break; |
| case STB: |
| mexc = memory_write(asi, address, rdd, 0, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } |
| break; |
| case STDA: |
| if (!chk_asi(sregs, &asi, op3)) break; |
| case STD: |
| if (address & 0x7) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| if (rd & 1) { |
| rd &= 0x1e; |
| if (rd > 7) |
| rdd = &(sregs->r[(cwp + rd) & 0x7f]); |
| else |
| rdd = &(sregs->g[rd]); |
| } |
| mexc = memory_write(asi, address, rdd, 3, &ws); |
| sregs->hold += ws; |
| sregs->icnt = T_STD; |
| #ifdef STAT |
| sregs->nstore++; /* Double store counts twice */ |
| #endif |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| break; |
| } |
| break; |
| case STDFQ: |
| if ((sregs->psr & 0x1f) > 7) { |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| if (!((sregs->psr & PSR_EF) && FP_PRES)) { |
| sregs->trap = TRAP_FPDIS; |
| break; |
| } |
| if (address & 0x7) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| if (!(sregs->fsr & FSR_QNE)) { |
| sregs->fsr = (sregs->fsr & ~FSR_TT) | FP_SEQ_ERR; |
| break; |
| } |
| rdd = &(sregs->fpq[0]); |
| mexc = memory_write(asi, address, rdd, 3, &ws); |
| sregs->hold += ws; |
| sregs->icnt = T_STD; |
| #ifdef STAT |
| sregs->nstore++; /* Double store counts twice */ |
| #endif |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| break; |
| } else { |
| sregs->fsr &= ~FSR_QNE; |
| sregs->fpstate = FP_EXE_MODE; |
| } |
| break; |
| case STHA: |
| if (!chk_asi(sregs, &asi, op3)) break; |
| case STH: |
| if (address & 0x1) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| mexc = memory_write(asi, address, rdd, 1, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } |
| break; |
| case STF: |
| if (!((sregs->psr & PSR_EF) && FP_PRES)) { |
| sregs->trap = TRAP_FPDIS; |
| break; |
| } |
| if (address & 0x3) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| if (ebase.simtime < sregs->ftime) { |
| if (sregs->frd == rd) |
| sregs->fhold += (sregs->ftime - ebase.simtime); |
| } |
| mexc = memory_write(asi, address, (uint32_t *)&sregs->fsi[rd], 2, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } |
| break; |
| case STDF: |
| if (!((sregs->psr & PSR_EF) && FP_PRES)) { |
| sregs->trap = TRAP_FPDIS; |
| break; |
| } |
| if (address & 0x7) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| rd &= 0x1E; |
| if (ebase.simtime < sregs->ftime) { |
| if ((sregs->frd == rd) || (sregs->frd + 1 == rd)) |
| sregs->fhold += (sregs->ftime - ebase.simtime); |
| } |
| mexc = memory_write(asi, address, (uint32_t *)&sregs->fsi[rd], 3, &ws); |
| sregs->hold += ws; |
| sregs->icnt = T_STD; |
| #ifdef STAT |
| sregs->nstore++; /* Double store counts twice */ |
| #endif |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| } |
| break; |
| case SWAPA: |
| if (!chk_asi(sregs, &asi, op3)) break; |
| case SWAP: |
| if (address & 0x3) { |
| sregs->trap = TRAP_UNALI; |
| break; |
| } |
| mexc = memory_read(asi, address, &data, 2, &ws); |
| sregs->hold += ws; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| break; |
| } |
| mexc = memory_write(asi, address, rdd, 2, &ws); |
| sregs->hold += ws; |
| sregs->icnt = T_LDST; |
| if (mexc) { |
| sregs->trap = TRAP_DEXC; |
| break; |
| } else |
| *rdd = data; |
| #ifdef STAT |
| sregs->nload++; |
| #endif |
| break; |
| |
| |
| default: |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| |
| #ifdef LOAD_DEL |
| |
| if (!(op3 & 4)) { |
| sregs->ildtime = ebase.simtime + sregs->hold + sregs->icnt; |
| sregs->ildreg = rd; |
| if ((op3 | 0x10) == 0x13) |
| sregs->ildreg |= 1; /* Double load, odd register loaded |
| * last */ |
| } |
| #endif |
| break; |
| |
| default: |
| sregs->trap = TRAP_UNIMP; |
| break; |
| } |
| sregs->g[0] = 0; |
| if (!sregs->trap) { |
| sregs->pc = pc; |
| sregs->npc = npc; |
| } |
| return 0; |
| } |
| |
| #define T_FABSs 2 |
| #define T_FADDs 4 |
| #define T_FADDd 4 |
| #define T_FCMPs 4 |
| #define T_FCMPd 4 |
| #define T_FDIVs 20 |
| #define T_FDIVd 35 |
| #define T_FMOVs 2 |
| #define T_FMULs 5 |
| #define T_FMULd 9 |
| #define T_FNEGs 2 |
| #define T_FSQRTs 37 |
| #define T_FSQRTd 65 |
| #define T_FSUBs 4 |
| #define T_FSUBd 4 |
| #define T_FdTOi 7 |
| #define T_FdTOs 3 |
| #define T_FiTOs 6 |
| #define T_FiTOd 6 |
| #define T_FsTOi 6 |
| #define T_FsTOd 2 |
| |
| #define FABSs 0x09 |
| #define FADDs 0x41 |
| #define FADDd 0x42 |
| #define FCMPs 0x51 |
| #define FCMPd 0x52 |
| #define FCMPEs 0x55 |
| #define FCMPEd 0x56 |
| #define FDIVs 0x4D |
| #define FDIVd 0x4E |
| #define FMOVs 0x01 |
| #define FMULs 0x49 |
| #define FMULd 0x4A |
| #define FNEGs 0x05 |
| #define FSQRTs 0x29 |
| #define FSQRTd 0x2A |
| #define FSUBs 0x45 |
| #define FSUBd 0x46 |
| #define FdTOi 0xD2 |
| #define FdTOs 0xC6 |
| #define FiTOs 0xC4 |
| #define FiTOd 0xC8 |
| #define FsTOi 0xD1 |
| #define FsTOd 0xC9 |
| |
| |
| static int |
| fpexec(uint32_t op3, uint32_t rd, uint32_t rs1, uint32_t rs2, struct pstate *sregs) |
| { |
| uint32_t opf, tem, accex; |
| int32_t fcc; |
| uint32_t ldadj; |
| |
| if (sregs->fpstate == FP_EXC_MODE) { |
| sregs->fsr = (sregs->fsr & ~FSR_TT) | FP_SEQ_ERR; |
| sregs->fpstate = FP_EXC_PE; |
| return 0; |
| } |
| if (sregs->fpstate == FP_EXC_PE) { |
| sregs->fpstate = FP_EXC_MODE; |
| return TRAP_FPEXC; |
| } |
| opf = (sregs->inst >> 5) & 0x1ff; |
| |
| /* |
| * Check if we already have an FPop in the pipe. If so, halt until it is |
| * finished by incrementing fhold with the remaining execution time |
| */ |
| |
| if (ebase.simtime < sregs->ftime) { |
| sregs->fhold = (sregs->ftime - ebase.simtime); |
| } else { |
| sregs->fhold = 0; |
| |
| /* Check load dependencies. */ |
| |
| if (ebase.simtime < sregs->ltime) { |
| |
| /* Don't check rs1 if single operand instructions */ |
| |
| if (((opf >> 6) == 0) || ((opf >> 6) == 3)) |
| rs1 = 32; |
| |
| /* Adjust for double floats */ |
| |
| ldadj = opf & 1; |
| if (!(((sregs->flrd - rs1) >> ldadj) && ((sregs->flrd - rs2) >> ldadj))) |
| sregs->fhold++; |
| } |
| } |
| |
| sregs->finst++; |
| |
| sregs->frs1 = rs1; /* Store src and dst for dependecy check */ |
| sregs->frs2 = rs2; |
| sregs->frd = rd; |
| |
| sregs->ftime = ebase.simtime + sregs->hold + sregs->fhold; |
| |
| /* SPARC is big-endian - swap double floats if host is little-endian */ |
| /* This is ugly - I know ... */ |
| |
| /* FIXME: should use (HOST_BYTE_ORDER == CURRENT_TARGET_BYTE_ORDER) |
| but what about machines where float values are different endianness |
| from integer values? */ |
| |
| #ifdef HOST_LITTLE_ENDIAN |
| rs1 &= 0x1f; |
| switch (opf) { |
| case FADDd: |
| case FDIVd: |
| case FMULd: |
| case FSQRTd: |
| case FSUBd: |
| case FCMPd: |
| case FCMPEd: |
| case FdTOi: |
| case FdTOs: |
| sregs->fdp[rs1 | 1] = sregs->fs[rs1 & ~1]; |
| sregs->fdp[rs1 & ~1] = sregs->fs[rs1 | 1]; |
| sregs->fdp[rs2 | 1] = sregs->fs[rs2 & ~1]; |
| sregs->fdp[rs2 & ~1] = sregs->fs[rs2 | 1]; |
| default: |
| break; |
| } |
| #endif |
| |
| clear_accex(); |
| |
| switch (opf) { |
| case FABSs: |
| sregs->fs[rd] = fabs(sregs->fs[rs2]); |
| sregs->ftime += T_FABSs; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| case FADDs: |
| sregs->fs[rd] = sregs->fs[rs1] + sregs->fs[rs2]; |
| sregs->ftime += T_FADDs; |
| break; |
| case FADDd: |
| sregs->fd[rd >> 1] = sregs->fd[rs1 >> 1] + sregs->fd[rs2 >> 1]; |
| sregs->ftime += T_FADDd; |
| break; |
| case FCMPs: |
| case FCMPEs: |
| if (sregs->fs[rs1] == sregs->fs[rs2]) |
| fcc = 3; |
| else if (sregs->fs[rs1] < sregs->fs[rs2]) |
| fcc = 2; |
| else if (sregs->fs[rs1] > sregs->fs[rs2]) |
| fcc = 1; |
| else |
| fcc = 0; |
| sregs->fsr |= 0x0C00; |
| sregs->fsr &= ~(fcc << 10); |
| sregs->ftime += T_FCMPs; |
| sregs->frd = 32; /* rd ignored */ |
| if ((fcc == 0) && (opf == FCMPEs)) { |
| sregs->fpstate = FP_EXC_PE; |
| sregs->fsr = (sregs->fsr & ~0x1C000) | (1 << 14); |
| } |
| break; |
| case FCMPd: |
| case FCMPEd: |
| if (sregs->fd[rs1 >> 1] == sregs->fd[rs2 >> 1]) |
| fcc = 3; |
| else if (sregs->fd[rs1 >> 1] < sregs->fd[rs2 >> 1]) |
| fcc = 2; |
| else if (sregs->fd[rs1 >> 1] > sregs->fd[rs2 >> 1]) |
| fcc = 1; |
| else |
| fcc = 0; |
| sregs->fsr |= 0x0C00; |
| sregs->fsr &= ~(fcc << 10); |
| sregs->ftime += T_FCMPd; |
| sregs->frd = 32; /* rd ignored */ |
| if ((fcc == 0) && (opf == FCMPEd)) { |
| sregs->fpstate = FP_EXC_PE; |
| sregs->fsr = (sregs->fsr & ~FSR_TT) | FP_IEEE; |
| } |
| break; |
| case FDIVs: |
| sregs->fs[rd] = sregs->fs[rs1] / sregs->fs[rs2]; |
| sregs->ftime += T_FDIVs; |
| break; |
| case FDIVd: |
| sregs->fd[rd >> 1] = sregs->fd[rs1 >> 1] / sregs->fd[rs2 >> 1]; |
| sregs->ftime += T_FDIVd; |
| break; |
| case FMOVs: |
| sregs->fs[rd] = sregs->fs[rs2]; |
| sregs->ftime += T_FMOVs; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| case FMULs: |
| sregs->fs[rd] = sregs->fs[rs1] * sregs->fs[rs2]; |
| sregs->ftime += T_FMULs; |
| break; |
| case FMULd: |
| sregs->fd[rd >> 1] = sregs->fd[rs1 >> 1] * sregs->fd[rs2 >> 1]; |
| sregs->ftime += T_FMULd; |
| break; |
| case FNEGs: |
| sregs->fs[rd] = -sregs->fs[rs2]; |
| sregs->ftime += T_FNEGs; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| case FSQRTs: |
| if (sregs->fs[rs2] < 0.0) { |
| sregs->fpstate = FP_EXC_PE; |
| sregs->fsr = (sregs->fsr & ~FSR_TT) | FP_IEEE; |
| sregs->fsr = (sregs->fsr & 0x1f) | 0x10; |
| break; |
| } |
| sregs->fs[rd] = sqrt(sregs->fs[rs2]); |
| sregs->ftime += T_FSQRTs; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| case FSQRTd: |
| if (sregs->fd[rs2 >> 1] < 0.0) { |
| sregs->fpstate = FP_EXC_PE; |
| sregs->fsr = (sregs->fsr & ~FSR_TT) | FP_IEEE; |
| sregs->fsr = (sregs->fsr & 0x1f) | 0x10; |
| break; |
| } |
| sregs->fd[rd >> 1] = sqrt(sregs->fd[rs2 >> 1]); |
| sregs->ftime += T_FSQRTd; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| case FSUBs: |
| sregs->fs[rd] = sregs->fs[rs1] - sregs->fs[rs2]; |
| sregs->ftime += T_FSUBs; |
| break; |
| case FSUBd: |
| sregs->fd[rd >> 1] = sregs->fd[rs1 >> 1] - sregs->fd[rs2 >> 1]; |
| sregs->ftime += T_FSUBd; |
| break; |
| case FdTOi: |
| sregs->fsi[rd] = (int) sregs->fd[rs2 >> 1]; |
| sregs->ftime += T_FdTOi; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| case FdTOs: |
| sregs->fs[rd] = (float32) sregs->fd[rs2 >> 1]; |
| sregs->ftime += T_FdTOs; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| case FiTOs: |
| sregs->fs[rd] = (float32) sregs->fsi[rs2]; |
| sregs->ftime += T_FiTOs; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| case FiTOd: |
| sregs->fd[rd >> 1] = (float64) sregs->fsi[rs2]; |
| sregs->ftime += T_FiTOd; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| case FsTOi: |
| sregs->fsi[rd] = (int) sregs->fs[rs2]; |
| sregs->ftime += T_FsTOi; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| case FsTOd: |
| sregs->fd[rd >> 1] = sregs->fs[rs2]; |
| sregs->ftime += T_FsTOd; |
| sregs->frs1 = 32; /* rs1 ignored */ |
| break; |
| |
| default: |
| sregs->fsr = (sregs->fsr & ~FSR_TT) | FP_UNIMP; |
| sregs->fpstate = FP_EXC_PE; |
| } |
| |
| #ifdef ERRINJ |
| if (errftt) { |
| sregs->fsr = (sregs->fsr & ~FSR_TT) | (errftt << 14); |
| sregs->fpstate = FP_EXC_PE; |
| if (sis_verbose) printf("Inserted fpu error %X\n",errftt); |
| errftt = 0; |
| } |
| #endif |
| |
| accex = get_accex(); |
| |
| #ifdef HOST_LITTLE_ENDIAN |
| switch (opf) { |
| case FADDd: |
| case FDIVd: |
| case FMULd: |
| case FSQRTd: |
| case FSUBd: |
| case FiTOd: |
| case FsTOd: |
| sregs->fs[rd & ~1] = sregs->fdp[rd | 1]; |
| sregs->fs[rd | 1] = sregs->fdp[rd & ~1]; |
| default: |
| break; |
| } |
| #endif |
| if (sregs->fpstate == FP_EXC_PE) { |
| sregs->fpq[0] = sregs->pc; |
| sregs->fpq[1] = sregs->inst; |
| sregs->fsr |= FSR_QNE; |
| } else { |
| tem = (sregs->fsr >> 23) & 0x1f; |
| if (tem & accex) { |
| sregs->fpstate = FP_EXC_PE; |
| sregs->fsr = (sregs->fsr & ~FSR_TT) | FP_IEEE; |
| sregs->fsr = ((sregs->fsr & ~0x1f) | accex); |
| } else { |
| sregs->fsr = ((((sregs->fsr >> 5) | accex) << 5) | accex); |
| } |
| if (sregs->fpstate == FP_EXC_PE) { |
| sregs->fpq[0] = sregs->pc; |
| sregs->fpq[1] = sregs->inst; |
| sregs->fsr |= FSR_QNE; |
| } |
| } |
| clear_accex(); |
| |
| return 0; |
| |
| |
| } |
| |
| static int |
| chk_asi(struct pstate *sregs, uint32_t *asi, uint32_t op3) |
| { |
| if (!(sregs->psr & PSR_S)) { |
| sregs->trap = TRAP_PRIVI; |
| return 0; |
| } else if (sregs->inst & INST_I) { |
| sregs->trap = TRAP_UNIMP; |
| return 0; |
| } else |
| *asi = (sregs->inst >> 5) & 0x0ff; |
| return 1; |
| } |
| |
| int |
| execute_trap(struct pstate *sregs) |
| { |
| int32_t cwp; |
| |
| if (sregs->trap == 256) { |
| sregs->pc = 0; |
| sregs->npc = 4; |
| sregs->trap = 0; |
| } else if (sregs->trap == 257) { |
| return ERROR; |
| } else { |
| |
| if ((sregs->psr & PSR_ET) == 0) |
| return ERROR; |
| |
| sregs->tbr = (sregs->tbr & 0xfffff000) | (sregs->trap << 4); |
| sregs->trap = 0; |
| sregs->psr &= ~PSR_ET; |
| sregs->psr |= ((sregs->psr & PSR_S) >> 1); |
| sregs->annul = 0; |
| sregs->psr = (((sregs->psr & PSR_CWP) - 1) & 0x7) | (sregs->psr & ~PSR_CWP); |
| cwp = ((sregs->psr & PSR_CWP) << 4); |
| sregs->r[(cwp + 17) & 0x7f] = sregs->pc; |
| sregs->r[(cwp + 18) & 0x7f] = sregs->npc; |
| sregs->psr |= PSR_S; |
| sregs->pc = sregs->tbr; |
| sregs->npc = sregs->tbr + 4; |
| |
| if ( 0 != (1 & sregs->asr17) ) { |
| /* single vector trapping! */ |
| sregs->pc = sregs->tbr & 0xfffff000; |
| sregs->npc = sregs->pc + 4; |
| } |
| |
| /* Increase simulator time */ |
| sregs->icnt = TRAP_C; |
| |
| } |
| |
| |
| return 0; |
| |
| } |
| |
| extern struct irqcell irqarr[16]; |
| |
| int |
| check_interrupts(struct pstate *sregs) |
| { |
| #ifdef ERRINJ |
| if (errtt) { |
| sregs->trap = errtt; |
| if (sis_verbose) printf("Inserted error trap 0x%02X\n",errtt); |
| errtt = 0; |
| } |
| #endif |
| |
| if ((ext_irl) && (sregs->psr & PSR_ET) && |
| ((ext_irl == 15) || (ext_irl > (int) ((sregs->psr & PSR_PIL) >> 8)))) { |
| if (sregs->trap == 0) { |
| sregs->trap = 16 + ext_irl; |
| irqarr[ext_irl & 0x0f].callback(irqarr[ext_irl & 0x0f].arg); |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| void |
| init_regs(struct pstate *sregs) |
| { |
| sregs->pc = 0; |
| sregs->npc = 4; |
| sregs->trap = 0; |
| sregs->psr &= 0x00f03fdf; |
| sregs->psr |= 0x11000080; /* Set supervisor bit */ |
| sregs->breakpoint = 0; |
| sregs->annul = 0; |
| sregs->fpstate = FP_EXE_MODE; |
| sregs->fpqn = 0; |
| sregs->ftime = 0; |
| sregs->ltime = 0; |
| sregs->err_mode = 0; |
| ext_irl = 0; |
| sregs->g[0] = 0; |
| #ifdef HOST_LITTLE_ENDIAN |
| sregs->fdp = (float32 *) sregs->fd; |
| sregs->fsi = (int32_t *) sregs->fs; |
| #else |
| sregs->fs = (float32 *) sregs->fd; |
| sregs->fsi = (int32_t *) sregs->fd; |
| #endif |
| sregs->fsr = 0; |
| sregs->fpu_pres = !nfp; |
| set_fsr(sregs->fsr); |
| sregs->bphit = 0; |
| sregs->ildreg = 0; |
| sregs->ildtime = 0; |
| |
| sregs->y = 0; |
| sregs->asr17 = 0; |
| |
| sregs->rett_err = 0; |
| sregs->jmpltime = 0; |
| } |
