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authorMohammed Gamal <m.gamal005@gmail.com>2008-09-01 04:52:24 +0300
committerAvi Kivity <avi@qumranet.com>2008-10-15 10:15:25 +0200
commitfb4616f43148c5b3f3e453a47657572d1bda39ee (patch)
tree875be2a5ef494832a577de867db623c3177ffe27 /arch
parent20766c083e6ab3c33125f07c7ffe39914c106d98 (diff)
KVM: x86 emulator: Add std and cld instructions (opcodes 0xfc-0xfd)
This adds the std and cld instructions to the emulator. Encountered while running the BIOS with invalid guest state emulation enabled. Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/x86_emulate.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index 66e0bd6c628..944f1f4d4be 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -187,7 +187,7 @@ static u16 opcode_table[256] = {
ImplicitOps, ImplicitOps, Group | Group3_Byte, Group | Group3,
/* 0xF8 - 0xFF */
ImplicitOps, 0, ImplicitOps, ImplicitOps,
- 0, 0, Group | Group4, Group | Group5,
+ ImplicitOps, ImplicitOps, Group | Group4, Group | Group5,
};
static u16 twobyte_table[256] = {
@@ -1762,6 +1762,14 @@ special_insn:
ctxt->eflags |= X86_EFLAGS_IF;
c->dst.type = OP_NONE; /* Disable writeback. */
break;
+ case 0xfc: /* cld */
+ ctxt->eflags &= ~EFLG_DF;
+ c->dst.type = OP_NONE; /* Disable writeback. */
+ break;
+ case 0xfd: /* std */
+ ctxt->eflags |= EFLG_DF;
+ c->dst.type = OP_NONE; /* Disable writeback. */
+ break;
case 0xfe ... 0xff: /* Grp4/Grp5 */
rc = emulate_grp45(ctxt, ops);
if (rc != 0)