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OpenCloudOS-Kernel
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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>
This commit is contained in:
Mohammed Gamal 2008-09-01 04:52:24 +03:00 committed by Avi Kivity
parent 20766c083e
commit fb4616f431
1 changed files with 9 additions and 1 deletions
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10
arch/x86/kvm/x86_emulate.c
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@ -187,7 +187,7 @@ static u16 opcode_table[256] = {
ImplicitOps, ImplicitOps, Group | Group3_Byte, Group | Group3, ImplicitOps, ImplicitOps, Group | Group3_Byte, Group | Group3,
/* 0xF8 - 0xFF */ /* 0xF8 - 0xFF */
ImplicitOps, 0, ImplicitOps, ImplicitOps, ImplicitOps, 0, ImplicitOps, ImplicitOps,
0, 0, Group | Group4, Group | Group5, ImplicitOps, ImplicitOps, Group | Group4, Group | Group5,
}; };
static u16 twobyte_table[256] = { static u16 twobyte_table[256] = {
@ -1762,6 +1762,14 @@ special_insn:
ctxt->eflags |= X86_EFLAGS_IF; ctxt->eflags |= X86_EFLAGS_IF;
c->dst.type = OP_NONE; /* Disable writeback. */ c->dst.type = OP_NONE; /* Disable writeback. */
break; 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 */ case 0xfe ... 0xff: /* Grp4/Grp5 */
rc = emulate_grp45(ctxt, ops); rc = emulate_grp45(ctxt, ops);
if (rc != 0) if (rc != 0)