From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Yongjun Subject: [PATCH] KVM: x86 emulator: add bsf/bsr instruction emulation Date: Mon, 09 Aug 2010 18:00:05 +0800 Message-ID: <4C5FD1A5.5040805@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=GB2312 Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from cn.fujitsu.com ([222.73.24.84]:59515 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1755958Ab0HIKCc (ORCPT ); Mon, 9 Aug 2010 06:02:32 -0400 Sender: kvm-owner@vger.kernel.org List-ID: Add bsf/bsr instruction emulation (opcode 0x0f 0xbc~0xbd) Signed-off-by: Wei Yongjun --- arch/x86/kvm/emulate.c | 28 ++++++++++++++++++++++++++-- 1 files changed, 26 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index fb4ac8c..831aa6e 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2342,8 +2342,8 @@ static struct opcode twobyte_table[256] = { /* 0xB8 - 0xBF */ N, N, G(BitOp, group8), D(DstMem | SrcReg | ModRM | BitOp | Lock), - N, N, D(ByteOp | DstReg | SrcMem | ModRM | Mov), - D(DstReg | SrcMem16 | ModRM | Mov), + D(DstReg | SrcMem | ModRM), D(DstReg | SrcMem | ModRM), + D(ByteOp | DstReg | SrcMem | ModRM | Mov), D(DstReg | SrcMem16 | ModRM | Mov), /* 0xC0 - 0xCF */ N, N, N, D(DstMem | SrcReg | ModRM | Mov), N, N, N, GD(0, &group9), @@ -3464,6 +3464,30 @@ twobyte_insn: btc: /* btc */ emulate_2op_SrcV_nobyte("btc", c->src, c->dst, ctxt->eflags); break; + case 0xbc: { /* bsf */ + int zf; + __asm__ ("bsf %2, %0; setz %b1" + : "=r"(c->dst.val), "=q"(zf) + : "r"(c->src.val), "1" (0)); + ctxt->eflags &= ~X86_EFLAGS_ZF; + if (zf) { + ctxt->eflags |= X86_EFLAGS_ZF; + c->dst.type = OP_NONE; /* Disable writeback. */ + } + break; + } + case 0xbd: { /* bsr */ + int zf; + __asm__ ("bsr %2, %0; setz %b1" + : "=r"(c->dst.val), "=q"(zf) + : "r"(c->src.val), "1" (0)); + ctxt->eflags &= ~X86_EFLAGS_ZF; + if (zf) { + ctxt->eflags |= X86_EFLAGS_ZF; + c->dst.type = OP_NONE; /* Disable writeback. */ + } + break; + } case 0xbe ... 0xbf: /* movsx */ c->dst.bytes = c->op_bytes; c->dst.val = (c->d & ByteOp) ? (s8) c->src.val : -- 1.7.0.4