ref: a2c0e55e6885fde0d135831a77d227bc933d89e7
dir: /sys/src/cmd/vi/run.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mach.h>
#define Extern extern
#include "mips.h"
void Iaddi(ulong);
void Isw(ulong);
void Ilui(ulong);
void Iori(ulong);
void Ixori(ulong);
void Ilw(ulong);
void Ijal(ulong);
void Ispecial(ulong);
void Ibeq(ulong);
void Ibeql(ulong);
void Iaddiu(ulong);
void Ilb(ulong);
void Iandi(ulong);
void Ij(ulong);
void Ibne(ulong);
void Ibnel(ulong);
void Isb(ulong);
void Islti(ulong);
void Ibcond(ulong);
void Ibgtz(ulong);
void Ibgtzl(ulong);
void Ilbu(ulong);
void Ilhu(ulong);
void Ish(ulong);
void Ilh(ulong);
void Iblez(ulong);
void Iblezl(ulong);
void Isltiu(ulong);
void Iswc1(ulong);
void Ilwc1(ulong);
void Icop1(ulong);
void Ilwl(ulong);
void Ilwr(ulong);
void Ill(ulong);
void Isc(ulong);
Inst itab[] = {
{ Ispecial, 0 },
{ Ibcond, "bcond", Ibranch },
{ Ij, "j", Ibranch },
{ Ijal, "jal", Ibranch },
{ Ibeq, "beq", Ibranch },
{ Ibne, "bne", Ibranch },
{ Iblez, "blez", Ibranch },
{ Ibgtz, "bgtz", Ibranch },
{ Iaddi, "addi", Iarith }, /* 8 */
{ Iaddiu, "addiu", Iarith },
{ Islti, "slti", Iarith },
{ Isltiu, "sltiu", Iarith },
{ Iandi, "andi", Iarith },
{ Iori, "ori", Iarith },
{ Ixori, "xori", Iarith },
{ Ilui, "lui", Iload }, /* 15 */
{ undef, "" },
{ Icop1, "cop1", Ifloat },
{ undef, "" },
{ undef, "" },
{ Ibeql, "beql" },
{ Ibnel, "bnel" },
{ Iblezl, "blezl" },
{ Ibgtzl, "bgtzl" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ Ilb, "lb", Iload },
{ Ilh, "lh", Iload },
{ Ilwl, "lwl", Iload },
{ Ilw, "lw", Iload },
{ Ilbu, "lbu", Iload },
{ Ilhu, "lhu", Iload },
{ Ilwr, "lwr", Iload },
{ undef, "" },
{ Isb, "sb", Istore },
{ Ish, "sh", Istore },
{ undef, "" },
{ Isw, "sw", Istore }, /* 43 */
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ Ill, "ll", Iload},
{ Ilwc1, "lwc1", Ifloat },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ Isc, "sc", Istore },
{ Iswc1, "swc1", Ifloat },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ undef, "" },
{ 0 }
};
void
dortrace(void)
{
int i;
for(i = 0; i < 32; i++)
if(rtrace & (1<<i))
Bprint(bioout, "R%.2d %.8lux\n", i, reg.r[i]);
}
void
run(void)
{
do {
reg.r[0] = 0;
reg.ir = ifetch(reg.pc);
Iexec(reg.ir);
reg.pc += 4;
if(bplist)
brkchk(reg.pc, Instruction);
if(rtrace)
dortrace();
Bflush(bioout);
}while(--count);
}
void
undef(ulong inst)
{
/*
if((reg.ir>>26) == 0)
Bprint(bioout, "special=%d,%d table=%d\n",
(reg.ir>>3)&0x7, reg.ir&0x7, reg.ir&0x3f);
else
Bprint(bioout, "code=%d,%d table=%d\n",
reg.ir>>29, (reg.ir>>26)&0x7, reg.ir>>26);
*/
Bprint(bioout, "Undefined Instruction Trap IR %.8lux\n", inst);
longjmp(errjmp, 0);
}
void
Iaddi(ulong inst)
{
int rs, rt;
int imm;
Getrsrt(rs, rt, inst);
imm = (short)(inst&0xffff);
if(trace)
itrace("addi\tr%d,r%d,#0x%x", rt, rs, imm);
reg.r[rt] = reg.r[rs] + imm;
}
void
Iandi(ulong inst)
{
int rs, rt;
int imm;
Getrsrt(rs, rt, inst);
imm = inst&0xffff;
if(trace)
itrace("andi\tr%d,r%d,#0x%x", rt, rs, imm);
reg.r[rt] = reg.r[rs] & imm;
}
void
Isw(ulong inst)
{
int rt, rb;
int off;
ulong v;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
v = reg.r[rt];
if(trace)
itrace("sw\tr%d,0x%x(r%d) %lux=%lux",
rt, off, rb, reg.r[rb]+off, v);
putmem_w(reg.r[rb]+off, v);
}
void
Isb(ulong inst)
{
int rt, rb;
int off;
uchar value;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
value = reg.r[rt];
if(trace)
itrace("sb\tr%d,0x%x(r%d) %lux=%lux", rt, off, rb, reg.r[rb]+off, value);
putmem_b(reg.r[rb]+off, value);
}
void
Ish(ulong inst)
{
int rt, rb;
int off;
ushort value;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
value = reg.r[rt];
if(trace)
itrace("sh\tr%d,0x%x(r%d) %lux=%lux",
rt, off, rb, reg.r[rb]+off, value&0xffff);
putmem_h(reg.r[rb]+off, value);
}
void
Ilui(ulong inst)
{
int rs, rt;
int imm;
Getrsrt(rs, rt, inst);
USED(rs);
imm = inst<<16;
if(trace)
itrace("lui\tr%d,#0x%x", rt, imm);
reg.r[rt] = imm;
}
void
Iori(ulong inst)
{
int rs, rt;
int imm;
Getrsrt(rs, rt, inst);
imm = inst&0xffff;
if(trace)
itrace("ori\tr%d,r%d,#0x%x", rt, rs, imm);
reg.r[rt] = reg.r[rs] | imm;
}
void
Ixori(ulong inst)
{
int rs, rt;
int imm;
Getrsrt(rs, rt, inst);
imm = inst&0xffff;
if(trace)
itrace("xori\tr%d,r%d,#0x%x", rt, rs, imm);
reg.r[rt] = reg.r[rs] ^ imm;
}
void
Ilw(ulong inst)
{
int rt, rb;
int off;
ulong v, va;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
va = reg.r[rb]+off;
if(trace) {
v = 0;
if(!badvaddr(va, 4))
v = getmem_w(va);
itrace("lw\tr%d,0x%x(r%d) %lux=%lux", rt, off, rb, va, v);
}
reg.r[rt] = getmem_w(va);
}
void
Ilwl(ulong inst)
{
int rt, rb;
int off;
ulong v, va;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
va = reg.r[rb]+off;
if(trace) {
v = 0;
if(!badvaddr(va, 4))
v = getmem_w(va & ~3) << ((va & 3) << 3);
itrace("lwl\tr%d,0x%x(r%d) %lux=%lux", rt, off, rb, va, v);
}
v = getmem_w(va & ~3);
switch(va & 3) {
case 0:
reg.r[rt] = v;
break;
case 1:
reg.r[rt] = (v<<8) | (reg.r[rt] & 0xff);
break;
case 2:
reg.r[rt] = (v<<16) | (reg.r[rt] & 0xffff);
break;
case 3:
reg.r[rt] = (v<<24) | (reg.r[rt] & 0xffffff);
break;
}
}
void
Ilwr(ulong inst)
{
int rt, rb;
int off;
ulong v, va;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
va = reg.r[rb]+off;
if(trace) {
v = 0;
if(!badvaddr(va, 4))
v = getmem_w(va & ~3) << ((va & 3) << 3);
itrace("lwr\tr%d,0x%x(r%d) %lux=%lux", rt, off, rb, va, v);
}
v = getmem_w(va & ~3);
switch(va & 3) {
case 0:
break;
case 1:
reg.r[rt] = (v>>24) | (reg.r[rt] & 0xffffff00);
break;
case 2:
reg.r[rt] = (v>>16) | (reg.r[rt] & 0xffff0000);
break;
case 3:
reg.r[rt] = (v>>8) | (reg.r[rt] & 0xff000000);
break;
}
}
void
Ilh(ulong inst)
{
int rt, rb;
int off;
ulong v, va;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
va = reg.r[rb]+off;
if(trace) {
v = 0;
if(!badvaddr(va, 2))
v = (short)getmem_h(va);
itrace("lw\tr%d,0x%x(r%d) %lux=%lux", rt, off, rb, va, v);
}
reg.r[rt] = (short)getmem_h(va);
}
void
Ilhu(ulong inst)
{
int rt, rb;
int off;
ulong v, va;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
va = reg.r[rb]+off;
if(trace) {
v = 0;
if(!badvaddr(va, 2))
v = getmem_h(va) & 0xffff;
itrace("lhu\tr%d,0x%x(r%d) %lux=%lux", rt, off, rb, va, v);
}
reg.r[rt] = getmem_h(va) & 0xffff;
}
void
Ilb(ulong inst)
{
int rt, rb;
int off;
ulong v, va;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
va = reg.r[rb]+off;
if(trace) {
v = 0;
if(!badvaddr(va, 1))
v = (schar)getmem_b(va);
itrace("lb\tr%d,0x%x(r%d) %lux=%lux", rt, off, rb, va, v);
}
reg.r[rt] = (schar)getmem_b(va);
}
void
Ilbu(ulong inst)
{
int rt, rb;
int off;
ulong v, va;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
va = reg.r[rb]+off;
if(trace) {
v = 0;
if(!badvaddr(va, 1))
v = getmem_b(va) & 0xff;
itrace("lbu\tr%d,0x%x(r%d) %lux=%lux", rt, off, rb, va, v);
}
reg.r[rt] = getmem_b(va) & 0xff;
}
void
Ijal(ulong inst)
{
ulong npc;
Symbol s;
npc = (reg.pc&0xF0000000)|((inst&0x3FFFFFF)<<2);
if(trace)
itrace("jal\t0x%lux", npc);
reg.r[31] = reg.pc+8;
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Statbra();
Iexec(reg.ir);
if(calltree) {
findsym(npc, CTEXT, &s);
Bprint(bioout, "%8lux %s(", reg.pc, s.name);
printparams(&s, reg.r[29]);
Bprint(bioout, "from ");
printsource(reg.pc);
Bputc(bioout, '\n');
}
reg.pc = npc-4;
}
void
Ij(ulong inst)
{
ulong npc;
npc = (reg.pc&0xF0000000)|((inst&0x3FFFFFF)<<2);
if(trace)
itrace("j\t0x%lux", npc);
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Statbra();
Iexec(reg.ir);
reg.pc = npc-4;
}
void
Ibeq(ulong inst)
{
int rt, rs;
int off;
ulong npc;
Getrsrt(rs, rt, inst);
off = (short)(inst&0xffff);
npc = reg.pc + (off<<2) + 4;
if(trace)
itrace("beq\tr%d,r%d,0x%lux", rs, rt, npc);
if(reg.r[rs] == reg.r[rt]) {
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Statbra();
Iexec(reg.ir);
reg.pc = npc-4;
}
}
void
Ibeql(ulong inst)
{
int rt, rs;
int off;
ulong npc;
Getrsrt(rs, rt, inst);
off = (short)(inst&0xffff);
npc = reg.pc + (off<<2) + 4;
if(trace)
itrace("beq\tr%d,r%d,0x%lux", rs, rt, npc);
if(reg.r[rs] == reg.r[rt]) {
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Statbra();
Iexec(reg.ir);
reg.pc = npc-4;
} else
reg.pc += 4;
}
void
Ibgtz(ulong inst)
{
int rs;
int off;
ulong npc, r;
rs = (inst>>21)&0x1f;
off = (short)(inst&0xffff);
npc = reg.pc + (off<<2) + 4;
if(trace)
itrace("bgtz\tr%d,0x%lux", rs, npc);
r = reg.r[rs];
if(!(r&SIGNBIT) && r != 0) {
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Iexec(reg.ir);
reg.pc = npc-4;
}
}
void
Ibgtzl(ulong inst)
{
int rs;
int off;
ulong npc, r;
rs = (inst>>21)&0x1f;
off = (short)(inst&0xffff);
npc = reg.pc + (off<<2) + 4;
if(trace)
itrace("bgtz\tr%d,0x%lux", rs, npc);
r = reg.r[rs];
if(!(r&SIGNBIT) && r != 0) {
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Iexec(reg.ir);
reg.pc = npc-4;
} else
reg.pc += 4;
}
void
Iblez(ulong inst)
{
int rs;
int off;
ulong npc, r;
rs = (inst>>21)&0x1f;
off = (short)(inst&0xffff);
npc = reg.pc + (off<<2) + 4;
if(trace)
itrace("blez\tr%d,0x%lux", rs, npc);
r = reg.r[rs];
if((r&SIGNBIT) || r == 0) {
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Statbra();
Iexec(reg.ir);
reg.pc = npc-4;
}
}
void
Iblezl(ulong inst)
{
int rs;
int off;
ulong npc, r;
rs = (inst>>21)&0x1f;
off = (short)(inst&0xffff);
npc = reg.pc + (off<<2) + 4;
if(trace)
itrace("blez\tr%d,0x%lux", rs, npc);
r = reg.r[rs];
if((r&SIGNBIT) || r == 0) {
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Statbra();
Iexec(reg.ir);
reg.pc = npc-4;
} else
reg.pc += 4;
}
void
Ibne(ulong inst)
{
int rt, rs;
int off;
ulong npc;
Getrsrt(rs, rt, inst);
off = (short)(inst&0xffff);
npc = reg.pc + (off<<2) + 4;
if(trace)
itrace("bne\tr%d,r%d,0x%lux", rs, rt, npc);
if(reg.r[rs] != reg.r[rt]) {
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Statbra();
Iexec(reg.ir);
reg.pc = npc-4;
}
}
void
Ibnel(ulong inst)
{
int rt, rs;
int off;
ulong npc;
Getrsrt(rs, rt, inst);
off = (short)(inst&0xffff);
npc = reg.pc + (off<<2) + 4;
if(trace)
itrace("bne\tr%d,r%d,0x%lux", rs, rt, npc);
if(reg.r[rs] != reg.r[rt]) {
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Statbra();
Iexec(reg.ir);
reg.pc = npc-4;
} else
reg.pc += 4;
}
void
Iaddiu(ulong inst)
{
int rs, rt;
int imm;
Getrsrt(rs, rt, inst);
imm = (short)(inst&0xffff);
if(trace)
itrace("addiu\tr%d,r%d,#0x%x", rt, rs, imm);
reg.r[rt] = reg.r[rs]+imm;
}
void
Islti(ulong inst)
{
int rs, rt;
int imm;
Getrsrt(rs, rt, inst);
imm = (short)(inst&0xffff);
if(trace)
itrace("slti\tr%d,r%d,#0x%x", rt, rs, imm);
reg.r[rt] = reg.r[rs] < imm ? 1 : 0;
}
void
Isltiu(ulong inst)
{
int rs, rt;
int imm;
Getrsrt(rs, rt, inst);
imm = (short)(inst&0xffff);
if(trace)
itrace("sltiu\tr%d,r%d,#0x%x", rt, rs, imm);
reg.r[rt] = (ulong)reg.r[rs] < (ulong)imm ? 1 : 0;
}
/* ll and sc are implemented as lw and sw, since we simulate a uniprocessor */
void
Ill(ulong inst)
{
int rt, rb;
int off;
ulong v, va;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
va = reg.r[rb]+off;
if(trace) {
v = 0;
if(!badvaddr(va, 4))
v = getmem_w(va);
itrace("ll\tr%d,0x%x(r%d) %lux=%lux", rt, off, rb, va, v);
}
reg.r[rt] = getmem_w(va);
}
void
Isc(ulong inst)
{
int rt, rb;
int off;
ulong v;
Getrbrt(rb, rt, inst);
off = (short)(inst&0xffff);
v = reg.r[rt];
if(trace)
itrace("sc\tr%d,0x%x(r%d) %lux=%lux",
rt, off, rb, reg.r[rb]+off, v);
putmem_w(reg.r[rb]+off, v);
}
enum
{
Bltz = 0,
Bgez = 1,
Bltzal = 0x10,
Bgezal = 0x11,
Bltzl = 2,
Bgezl = 3,
Bltzall = 0x12,
Bgezall = 0x13,
};
static char *sbcond[] =
{
[Bltz] "ltz",
[Bgez] "gez",
[Bltzal] "ltzal",
[Bgezal] "gezal",
[Bltzl] "ltzl",
[Bgezl] "gezl",
[Bltzall] "ltzall",
[Bgezall] "gezall",
};
void
Ibcond(ulong inst)
{
int rs, bran;
int off, doit, likely;
ulong npc;
rs = (inst>>21)&0x1f;
bran = (inst>>16)&0x1f;
off = (short)(inst&0xffff);
doit = 0;
likely = 0;
npc = reg.pc + (off<<2) + 4;
switch(bran) {
default:
Bprint(bioout, "bcond=%d\n", bran);
undef(inst);
case Bltzl:
likely = 1;
case Bltz:
if(reg.r[rs]&SIGNBIT)
doit = 1;
break;
case Bgezl:
likely = 1;
case Bgez:
if(!(reg.r[rs]&SIGNBIT))
doit = 1;
break;
case Bltzall:
likely = 1;
case Bltzal:
reg.r[31] = reg.pc+8;
if(reg.r[rs]&SIGNBIT)
doit = 1;
break;
case Bgezall:
likely = 1;
case Bgezal:
reg.r[31] = reg.pc+8;
if(!(reg.r[rs]&SIGNBIT))
doit = 1;
break;
}
if(trace)
itrace("b%s\tr%d,0x%lux", sbcond[bran], rs, npc);
if(doit) {
/* Do the delay slot */
reg.ir = ifetch(reg.pc+4);
Statbra();
Iexec(reg.ir);
reg.pc = npc-4;
} else
if(likely)
reg.pc += 4;
}