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KVM: x86 emulator: put register operand fetch into a function

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The code is repeated three times, put it into fetch_register_operand()

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-08-01 12:53:09 +03:00
parent 3d9e77dff8
commit 91ff3cb43c
1 changed files with 21 additions and 40 deletions
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61
arch/x86/kvm/emulate.c
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@ -539,6 +539,24 @@ static int test_cc(unsigned int condition, unsigned int flags)
return (!!rc ^ (condition & 1));
}
static void fetch_register_operand(struct operand *op)
{
switch (op->bytes) {
case 1:
op->val = *(u8 *)op->addr.reg;
break;
case 2:
op->val = *(u16 *)op->addr.reg;
break;
case 4:
op->val = *(u32 *)op->addr.reg;
break;
case 8:
op->val = *(u64 *)op->addr.reg;
break;
}
}
static void decode_register_operand(struct operand *op,
struct decode_cache *c,
int inhibit_bytereg)
@ -551,23 +569,12 @@ static void decode_register_operand(struct operand *op,
op->type = OP_REG;
if ((c->d & ByteOp) && !inhibit_bytereg) {
op->addr.reg = decode_register(reg, c->regs, highbyte_regs);
op->val = *(u8 *)op->addr.reg;
op->bytes = 1;
} else {
op->addr.reg = decode_register(reg, c->regs, 0);
op->bytes = c->op_bytes;
switch (op->bytes) {
case 2:
op->val = *(u16 *)op->addr.reg;
break;
case 4:
op->val = *(u32 *)op->addr.reg;
break;
case 8:
op->val = *(u64 *) op->addr.reg;
break;
}
}
fetch_register_operand(op);
op->orig_val = op->val;
}
@ -2507,20 +2514,7 @@ done_prefixes:
c->src.type = OP_REG;
c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
c->src.addr.reg = &c->regs[VCPU_REGS_RAX];
switch (c->src.bytes) {
case 1:
c->src.val = *(u8 *)c->src.addr.reg;
break;
case 2:
c->src.val = *(u16 *)c->src.addr.reg;
break;
case 4:
c->src.val = *(u32 *)c->src.addr.reg;
break;
case 8:
c->src.val = *(u64 *)c->src.addr.reg;
break;
}
fetch_register_operand(&c->src);
break;
case SrcOne:
c->src.bytes = 1;
@ -2606,20 +2600,7 @@ done_prefixes:
c->dst.type = OP_REG;
c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
c->dst.addr.reg = &c->regs[VCPU_REGS_RAX];
switch (c->dst.bytes) {
case 1:
c->dst.val = *(u8 *)c->dst.addr.reg;
break;
case 2:
c->dst.val = *(u16 *)c->dst.addr.reg;
break;
case 4:
c->dst.val = *(u32 *)c->dst.addr.reg;
break;
case 8:
c->dst.val = *(u64 *)c->dst.addr.reg;
break;
}
fetch_register_operand(&c->dst);
c->dst.orig_val = c->dst.val;
break;
case DstDI: