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KVM: x86 emulator: imlpement jump conditional relative 

Implement emulation of instruction:
    jump conditional rel
    opcodes: 0x0f 0x80 - 0x0f 0x8f

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Nitin A Kamble 2007-09-15 10:23:07 +03:00 committed by Avi Kivity
parent 7de752482c
commit bbe9abbdac
1 changed files with 60 additions and 1 deletions
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61
drivers/kvm/x86_emulate.c
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@ -188,7 +188,10 @@ static u16 twobyte_table[256] = {
/* 0x70 - 0x7F */ /* 0x70 - 0x7F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x80 - 0x8F */ /* 0x80 - 0x8F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
/* 0x90 - 0x9F */ /* 0x90 - 0x9F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0xA0 - 0xA7 */ /* 0xA0 - 0xA7 */
@ -479,6 +482,41 @@ static int read_descriptor(struct x86_emulate_ctxt *ctxt,
return rc; return rc;
} }
static int test_cc(unsigned int condition, unsigned int flags)
{
int rc = 0;
switch ((condition & 15) >> 1) {
case 0: /* o */
rc |= (flags & EFLG_OF);
break;
case 1: /* b/c/nae */
rc |= (flags & EFLG_CF);
break;
case 2: /* z/e */
rc |= (flags & EFLG_ZF);
break;
case 3: /* be/na */
rc |= (flags & (EFLG_CF|EFLG_ZF));
break;
case 4: /* s */
rc |= (flags & EFLG_SF);
break;
case 5: /* p/pe */
rc |= (flags & EFLG_PF);
break;
case 7: /* le/ng */
rc |= (flags & EFLG_ZF);
/* fall through */
case 6: /* l/nge */
rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF));
break;
}
/* Odd condition identifiers (lsb == 1) have inverted sense. */
return (!!rc ^ (condition & 1));
}
int int
x86_emulate_memop(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) x86_emulate_memop(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
{ {
@ -1486,6 +1524,27 @@ twobyte_special_insn:
} }
rc = X86EMUL_CONTINUE; rc = X86EMUL_CONTINUE;
break; break;
case 0x80 ... 0x8f: /* jnz rel, etc*/ {
long int rel;
switch (op_bytes) {
case 2:
rel = insn_fetch(s16, 2, _eip);
break;
case 4:
rel = insn_fetch(s32, 4, _eip);
break;
case 8:
rel = insn_fetch(s64, 8, _eip);
break;
default:
DPRINTF("jnz: Invalid op_bytes\n");
goto cannot_emulate;
}
if (test_cc(b, _eflags))
JMP_REL(rel);
break;
}
case 0xc7: /* Grp9 (cmpxchg8b) */ case 0xc7: /* Grp9 (cmpxchg8b) */
{ {
u64 old, new; u64 old, new;