Messages in this thread Patch in this message | | | From | Avi Kivity <> | Subject | [PATCH 01/25] KVM: x86 emulator: Add std and cld instructions (opcodes 0xfc-0xfd) | Date | Sun, 28 Sep 2008 18:44:37 +0300 |
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From: Mohammed Gamal <m.gamal005@gmail.com>
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> --- arch/x86/kvm/x86_emulate.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c index 66e0bd6..944f1f4 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) -- 1.6.0.1
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