darlinghq/darling-gdb
1
0
Fork 0
mirror of https://github.com/darlinghq/darling-gdb.git synced 2024-11-29 06:50:32 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
c412299f00
darling-gdb/sim/erc32/exec.c
Rob Savoye f4d2ff34be New sparc simulator from the ESA.
1996-05-20 02:46:07 +00:00

1598 lines
34 KiB
C
Raw Blame History

/*
* This file is part of SIS.
*
* SIS, SPARC instruction simulator V1.8 Copyright (C) 1995 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 2 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, write to the Free Software Foundation, Inc., 675
* Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "sis.h"
#include "end.h"
#include <math.h>
#include <stdio.h>
extern int32 ext_irl, irqpend, iurev0, sis_verbose;
/* 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 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 sregs->psr
#define ICC_Z (sregs->psr << 1)
#define ICC_V (sregs->psr << 2)
#define ICC_C (sregs->psr << 3)
#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 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 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 TADDCCTV 0x22
#define IAND 0x01
#define IANDCC 0x11
#define IANDN 0x05
#define IANDNCC 0x15
#define MULScc 0x24
#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 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
/* # of cycles overhead when a trap is taken */
#define TRAP_C 3
int32 fpexec();
extern struct estate ebase;
extern int32 nfp;
sub_cc(operand1, operand2, result, sregs)
int32 operand1;
int32 operand2;
int32 result;
struct pstate *sregs;
{
sregs->psr = ((sregs->psr & ~PSR_N) | ((result >> 8) & PSR_N));
if (result)
sregs->psr &= ~PSR_Z;
else
sregs->psr |= PSR_Z;
sregs->psr = (sregs->psr & ~PSR_V) | ((
((operand1 & ~operand2 & ~result) |
(~operand1 & operand2 & result)) >> 10) & PSR_V);
sregs->psr = (sregs->psr & ~PSR_C) | ((
((~operand1 & operand2) |
((~operand1 | operand2) & result)) >> 11) & PSR_C);
}
add_cc(operand1, operand2, result, psr)
int32 operand1;
int32 operand2;
int32 result;
uint32 *psr;
{
*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);
}
log_cc(result, sregs)
int32 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;
}
int
dispatch_instruction(sregs)
struct pstate *sregs;
{
uint32 cwp, op, op2, op3, opf, opc, asi, a, rd, cond, rs1,
rs2;
uint32 ldep;
int32 operand1, operand2, *rdd, result, i, disp22, eicc,
new_cwp;
int32 pc, npc, data, address, ws, mexc, fcc;
sregs->ninst++;
sregs->icnt = 1;
cwp = ((sregs->psr & PSR_CWP) << 4);
op = sregs->inst >> 30;
pc = sregs->npc;
npc = sregs->npc + 4;
if (op > 1) {
op3 = (sregs->inst >> 19) & 0x3f;
rs1 = (sregs->inst >> 14) & 0x1f;
rd = (sregs->inst >> 25) & 0x1f;
#ifdef LOAD_DEL
/* Check if load dependecy is possible */
ldep = ((ebase.simtime <= sregs->ildtime) && ((op3 & 0x38) != 0x28) &&
((op3 & 0x3e) != 0x34) && (sregs->ildreg != 0));
if (sregs->inst & INST_I) {
if (ldep && (sregs->ildreg == rs1))
sregs->hold++;
operand2 = sregs->inst & INST_SIMM13;
if (operand2 > 0x0fff)
operand2 |= 0xfffff000;
} 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 & INST_SIMM13;
if (operand2 > 0x0fff)
operand2 |= 0xfffff000;
} 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
cond = ((sregs->inst >> 25) & 0x0f);
switch (cond & 0x7) {
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;
}
eicc &= PSR_N;
if (sregs->inst & 0x10000000)
eicc = !eicc;
a = sregs->inst & 0x20000000;
if (eicc) {
operand1 = sregs->inst & 0x3fffff;
if (sregs->inst & 0x200000)
operand1 |= 0xffc00000;
npc = sregs->pc + (operand1 << 2);
if ((cond == BICC_BA) && (a))
sregs->annul = 1;
} else {
if (a)
sregs->annul = 1;
}
break;
case FPBCC:
#ifdef STAT
sregs->nbranch++;
#endif
if (!((sregs->psr & PSR_EF) && chk_fp(sregs))) {
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 & 0x7) {
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;
}
if (sregs->inst & 0x10000000)
eicc = !eicc;
a = sregs->inst & 0x20000000;
if (eicc) {
operand1 = sregs->inst & 0x3fffff;
if (sregs->inst & 0x200000)
operand1 |= 0xffc00000;
npc = sregs->pc + (operand1 << 2);
if ((cond == FBA) && (a))
sregs->annul = 1;
} else {
if (a)
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) && chk_fp(sregs))) {
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:
cond = ((sregs->inst >> 25) & 0x0f);
switch (cond & 0x7) {
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;
}
eicc &= PSR_N;
if (sregs->inst & 0x10000000)
eicc = !eicc;
if (eicc) {
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);
add_cc(operand1, operand2, *rdd, &sregs->psr);
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;
sub_cc(rs1, operand2, *rdd, sregs);
break;
case SUBX:
*rdd = rs1 - operand2 - ((sregs->psr >> 20) & 1);
break;
case SUBXCC:
*rdd = rs1 - operand2 - ((sregs->psr >> 20) & 1);
sub_cc(rs1, operand2, *rdd, sregs);
break;
case ADD:
*rdd = rs1 + operand2;
break;
case ADDCC:
*rdd = rs1 + operand2;
add_cc(rs1, operand2, *rdd, &sregs->psr);
break;
case ADDX:
*rdd = rs1 + operand2 + ((sregs->psr >> 20) & 1);
break;
case ADDXCC:
*rdd = rs1 + operand2 + ((sregs->psr >> 20) & 1);
add_cc(rs1, operand2, *rdd, &sregs->psr);
break;
case TADDCC:
*rdd = rs1 + operand2;
add_cc(rs1, operand2, *rdd, &sregs->psr);
if ((rs1 | operand2) & 0x3)
sregs->psr |= PSR_V;
break;
case TADDCCTV:
*rdd = rs1 + operand2;
result = 0;
add_cc(rs1, operand2, *rdd, &result);
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 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:
#ifdef IUREV0
if ((iurev0) && ((sregs->jmpltime + 1) == sregs->ninst)) {
if (!(sregs->rett_err)) {
sregs->rett_err = 1;
if (sis_verbose)
printf("IU rev.0 bug mode entered\n");
}
}
#endif
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;
#ifdef IUREV0
if (iurev0 & sregs->rett_err) {
operand2 = sregs->psr;
*rdd |= PSR_ET;
*rdd &= ~(PSR_S);
*rdd |= ((*rdd & PSR_PS) << 1);
if (sis_verbose) {
if (operand2 != *rdd)
printf("rdpsr failed: %08X -> %08X\n", operand2, *rdd);
}
}
#endif
break;
case RDY:
if (!(sregs->psr & PSR_S)) {
sregs->trap = TRAP_PRIVI;
break;
}
*rdd = sregs->y;
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 = (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:
sregs->y = (rs1 ^ operand2);
break;
case JMPL:
#ifdef IUREV0
if (iurev0)
sregs->jmpltime = sregs->ninst;
#endif
#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:
#ifdef IUREV0
if (iurev0 && sregs->rett_err) {
sregs->rett_err = 0;
if (sis_verbose)
printf("IU rev.0 bug mode reset\n");
}
#endif
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;
default:
sregs->trap = TRAP_UNIMP;
break;
}
}
break;
case 3: /* Load/store instructions */
address = rs1 + operand2;
/* Check for load/store to alternate address space */
if ((op3 >> 4) == 1) {
if (!(sregs->psr & PSR_S)) {
sregs->trap = TRAP_PRIVI;
break;
} else if (sregs->inst & INST_I) {
sregs->trap = TRAP_UNIMP;
break;
} else
asi = (sregs->inst >> 5) & 0x0ff;
} else {
if (sregs->psr & PSR_S)
asi = 11;
else
asi = 10;
#ifdef IUREV0
if (iurev0 && sregs->rett_err) {
asi &= ~0x1;
asi |= ((sregs->psr & PSR_PS) >> 6);
}
#endif
}
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:
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, &data, &ws);
sregs->hold += ws;
sregs->icnt = T_LDD;
if (mexc) {
sregs->trap = TRAP_DEXC;
} else {
rdd[0] = data;
address += 4;
mexc = memory_read(asi, address, &data, &ws);
sregs->hold += ws;
#ifdef STAT
sregs->nload++; /* Double load counts twice */
#endif
if (mexc) {
sregs->trap = TRAP_DEXC;
} else {
rdd[1] = data;
}
}
break;
case LDA:
case LD:
if (address & 0x3) {
sregs->trap = TRAP_UNALI;
break;
}
mexc = memory_read(asi, address, &data, &ws);
sregs->hold += ws;
if (mexc) {
sregs->trap = TRAP_DEXC;
} else {
*rdd = data;
}
break;
case LDSTUB:
case LDSTUBA:
mexc = memory_read(asi, address, &data, &ws);
sregs->hold += ws;
sregs->icnt = T_LDST;
if (mexc) {
sregs->trap = TRAP_DEXC;
break;
}
data = (data >> ((3 - (address & 0x3)) << 3)) & 0x0ff;
*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:
case LDSB:
case LDUB:
mexc = memory_read(asi, address, &data, &ws);
sregs->hold += ws;
if (mexc) {
sregs->trap = TRAP_DEXC;
break;
}
data = (data >> ((3 - (address & 0x3)) << 3)) & 0x0ff;
if ((op3 == LDSB) && (data >> 7))
data |= 0xffffff00;
*rdd = data;
break;
case LDSHA:
case LDUHA:
case LDSH:
case LDUH:
if (address & 0x1) {
sregs->trap = TRAP_UNALI;
break;
}
mexc = memory_read(asi, address, &data, &ws);
sregs->hold += ws;
if (mexc) {
sregs->trap = TRAP_DEXC;
break;
}
if (!(address & 0x2))
data >>= 16;
data &= 0x0ffff;
if ((op3 == LDSH) && (data >> 15))
data |= 0xffff0000;
*rdd = data;
break;
case LDF:
if (!((sregs->psr & PSR_EF) && chk_fp(sregs))) {
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, &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 {
sregs->fs[rd] = *((float32 *) & data);
}
break;
case LDDF:
if (!((sregs->psr & PSR_EF) && chk_fp(sregs))) {
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, &data, &ws);
sregs->hold += ws;
sregs->icnt = T_LDD;
if (mexc) {
sregs->trap = TRAP_DEXC;
} else {
rd &= 0x1E;
sregs->flrd = rd;
sregs->fs[rd] = *((float32 *) & data);
mexc = memory_read(asi, address + 4, &data, &ws);
sregs->hold += ws;
#ifdef STAT
sregs->nload++; /* Double load counts twice */
#endif
if (mexc) {
sregs->trap = TRAP_DEXC;
} else {
sregs->fs[rd + 1] = *((float32 *) & data);
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) && chk_fp(sregs))) {
sregs->trap = TRAP_FPDIS;
break;
}
if (address & 0x3) {
sregs->trap = TRAP_UNALI;
break;
}
mexc = memory_read(asi, address, &data, &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) && chk_fp(sregs))) {
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 ST:
case STA:
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 STB:
case STBA:
mexc = memory_write(asi, address, rdd, 0, &ws);
sregs->hold += ws;
if (mexc) {
sregs->trap = TRAP_DEXC;
}
break;
case STD:
case STDA:
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) && chk_fp(sregs))) {
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:
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) && chk_fp(sregs))) {
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, &sregs->fsi[rd], 2, &ws);
sregs->hold += ws;
if (mexc) {
sregs->trap = TRAP_DEXC;
}
break;
case STDF:
if (!((sregs->psr & PSR_EF) && chk_fp(sregs))) {
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, &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 SWAP:
case SWAPA:
if (address & 0x3) {
sregs->trap = TRAP_UNALI;
break;
}
mexc = memory_read(asi, address, &data, &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
int
fpexec(op3, rd, rs1, rs2, sregs)
uint32 op3, rd, rs1, rs2;
struct pstate *sregs;
{
uint32 opf, tem, accex;
float32 ftmps;
float64 ftmpd;
int32 fcc;
char *res;
uint32 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 ... */
#ifdef HOST_LITTLE_ENDIAN_FLOAT
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:
}
#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;
}
accex = get_accex();
#ifdef HOST_LITTLE_ENDIAN_FLOAT
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:
}
#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);
}
int
execute_trap(sregs)
struct pstate *sregs;
{
int32 cwp;
if (sregs->trap == 256) {
sregs->pc = 0;
sregs->npc = 4;
sregs->trap = 0;
} 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;
/* Increase simulator time */
sregs->icnt = TRAP_C;
}
return (0);
}
extern struct irqcell irqarr[16];
void
check_interrupts(sregs)
struct pstate *sregs;
{
if ((ext_irl) && (sregs->psr & PSR_ET) &&
((ext_irl == 15) || (ext_irl > ((sregs->psr & PSR_PIL) >> 8)))) {
if (sregs->trap == 0) {
sregs->trap = 16 + ext_irl;
irqarr[ext_irl & 0x0f].callback(irqarr[ext_irl & 0x0f].arg);
clear_int(ext_irl);
}
}
}
init_regs(sregs)
struct pstate *sregs;
{
int32 i;
sregs->pc = 0;
sregs->npc = 4;
sregs->trap = 0;
sregs->psr &= 0x00f03fdf;
sregs->psr |= 0x080; /* 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;
irqpend = 0;
sregs->g[0] = 0;
#ifdef HOST_LITTLE_ENDIAN_FLOAT
sregs->fdp = (float32 *) sregs->fd;
sregs->fsi = (int32 *) sregs->fs;
#else
sregs->fs = (float32 *) sregs->fd;
sregs->fsi = (int32 *) sregs->fd;
#endif
sregs->fsr = 0;
sregs->fpu_pres = !nfp;
set_fsr(sregs->fsr);
sregs->bphit = 0;
sregs->ildreg = 0;
sregs->ildtime = 0;
sregs->rett_err = 0;
sregs->jmpltime = 0;
}
chk_fp(sregs)
struct pstate *sregs;
{
return (sregs->fpu_pres);
}
Reference in New Issue View Git Blame Copy Permalink