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// See LICENSE for license details.
#include "pk.h"
#include "softint.h"
#include <stdint.h>
#define noisy 0
int emulate_int(trapframe_t* tf)
{
if(noisy)
printk("Int emulation at pc %lx, insn %x\n",tf->epc,(uint32_t)tf->insn);
#define RS1 ((tf->insn >> 15) & 0x1F)
#define RS2 ((tf->insn >> 20) & 0x1F)
#define RD ((tf->insn >> 7) & 0x1F)
// #define XRS1 (tf->gpr[RS1])
// #define XRS2 (tf->gpr[RS2])
#define XRD (tf->gpr[RD])
unsigned long xrs1 = tf->gpr[RS1];
unsigned long xrs2 = tf->gpr[RS2];
#define IS_INSN(x) ((tf->insn & MASK_ ## x) == MATCH_ ## x)
if(IS_INSN(DIV))
{
if(noisy)
printk("emulating div\n");
int num_negative = 0;
if ((signed long) xrs1 < 0)
{
xrs1 = -xrs1;
num_negative++;
}
if ((signed long) xrs2 < 0)
{
xrs2 = -xrs2;
num_negative++;
}
unsigned long res = softint_udivrem(xrs1, xrs2, 0);
if (num_negative == 1)
XRD = -res;
else
XRD = res;
}
else if(IS_INSN(DIVU))
{
if(noisy)
printk("emulating divu\n");
XRD = softint_udivrem( xrs1, xrs2, 0);
}
else if(IS_INSN(MUL))
{
if(noisy)
printk("emulating mul\n");
XRD = softint_mul(xrs1, xrs2);
}
else if(IS_INSN(REM))
{
if(noisy)
printk("emulating rem\n");
if ((signed long) xrs1 < 0) {xrs1 = -xrs1;}
if ((signed long) xrs2 < 0) {xrs2 = -xrs2;}
XRD = softint_udivrem(xrs1, xrs2, 1);
}
else if(IS_INSN(REMU))
{
if(noisy)
printk("emulating remu\n");
XRD = softint_udivrem(xrs1, xrs2, 1);
}
else
return -1;
return 0;
}
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