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#include <u.h>
#include <libc.h>
#include <thread.h>
#include <bio.h>
#include <mach.h>
#include "dat.h"
#include "fns.h"
void
resetvfp(void)
{
int i;
P->FPSR = 0x00000000;
for(i = 0; i < Nfpregs; i++)
P->F[i] = 0;
}
void
vfpregtransfer(u32int instr)
{
u32int *Rt;
long double *Fn;
Rt = P->R + ((instr>>12)&0xF);
Fn = P->F + ((instr>>16)&0xF);
switch((instr>>20)&0xF){
case 0:
*((int*)Fn) = *Rt; break;
case 1:
*Rt = *((int*)Fn); break;
case 14:
P->FPSR = *Rt; break;
case 15:
if(Rt == (P->R + 15))
P->CPSR = P->FPSR;
else
*Rt = P->FPSR;
break;
default:
sysfatal("unimplemented VFP instruction %8ux @ %8ux", instr, P->R[15] - 4);
}
}
void
vfprmtransfer(u32int instr)
{
int n, d, off, sz;
void* ea;
Segment *seg;
n = (instr>>16) & 0xF;
d = (instr>>12) & 0xF;
off = (instr & 0xFF) << 2;
sz = instr & (1<<8);
if((instr & (1<<23)) == 0)
off = -off;
ea = vaddr(evenaddr(P->R[n] + off, sz ? 7 : 3), 8, &seg);
switch((instr>>20)&0x3){
case 0:
if(sz)
*(double*)ea = P->F[d];
else
*(float*)ea = P->F[d];
break;
case 1:
if(sz)
P->F[d] = *(double*)ea;
else
P->F[d] = *(float*)ea;
break;
default:
sysfatal("unimplemented VFP instruction %8ux @ %8ux", instr, P->R[15] - 4);
}
segunlock(seg);
}
void
vfparithop(int opc, u32int instr)
{
int o;
long double *Fd, *Fn, *Fm;
Fd = P->F + ((instr>>12)&0xF);
Fn = P->F + ((instr>>16)&0xF);
Fm = P->F + (instr&0xF);
o = ((opc&0x3)<<1) | (opc&0x8) | ((instr>>6)&0x1);
switch(o){
case 4:
*Fd = *Fn * *Fm; break;
case 6:
*Fd = *Fn + *Fm; break;
case 7:
*Fd = *Fn - *Fm; break;
case 8:
*Fd = *Fn / *Fm; break;
default:
sysfatal("unimplemented VFP instruction %8ux @ %8ux", instr, P->R[15] - 4);
}
}
void
vfpotherop(u32int instr)
{
int o2, o3;
long double *Fd, *Fm, F0;
Fd = P->F + ((instr>>12)&0xF);
Fm = P->F + (instr&0xF);
F0 = 0.0;
o2 = (instr>>16) & 0xF;
o3 = (instr>>6) & 0x3;
if((o3&1) == 0)
sysfatal("unimplemented VFP instruction %8ux @ %8ux", instr, P->R[15] - 4);
switch(o2){
case 0x5:
Fm = &F0;
case 0x4:
if(*Fd < *Fm)
P->FPSR = (P->FPSR & ~FLAGS) | flN;
else if(*Fd >= *Fm) {
P->FPSR = (P->FPSR & ~FLAGS) | flC;
if(*Fd == *Fm)
P->FPSR |= flZ;
} else
P->FPSR = (P->FPSR & ~FLAGS) | flV | flC;
break;
case 0x8:
*Fd = *((int*)Fm); break;
case 0xD:
*((int*)Fd) = (int)*Fm; break;
default:
switch((o2<<1)|(o3>>1)){
case 0:
case 15:
*Fd = *Fm; break;
case 1:
*Fd = fabs(*Fm); break;
case 2:
*Fd = -*Fm; break;
case 3:
*Fd = sqrt(*Fm); break;
default:
sysfatal("unimplemented VFP instruction %8ux @ %8ux", instr, P->R[15] - 4);
}
}
}
void
vfpoperation(u32int instr)
{
int o1;
o1 = (instr>>20) & 0xF;
if(o1 == 0xB)
vfpotherop(instr);
else
vfparithop(o1, instr);
}
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