| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 26 Jun 2008 15:28:26 +0300
From: Avi Kivity <avi@...ranet.com>
To: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 44/50] KVM: x86 emulator: simplify sib decoding
Instead of using sparse switches, use simpler if/else sequences.
Signed-off-by: Avi Kivity <avi@...ranet.com>
---
arch/x86/kvm/x86_emulate.c | 20 ++++----------------
1 files changed, 4 insertions(+), 16 deletions(-)
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index 3721cfd..ca7ab24 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -748,24 +748,12 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
base_reg |= sib & 7;
scale = sib >> 6;
- switch (base_reg) {
- case 5:
- case 13:
- if (c->modrm_mod != 0)
- c->modrm_ea += c->regs[base_reg];
- else
- c->modrm_ea +=
- insn_fetch(s32, 4, c->eip);
- break;
- default:
+ if ((base_reg & 7) == 5 && c->modrm_mod == 0)
+ c->modrm_ea += insn_fetch(s32, 4, c->eip);
+ else
c->modrm_ea += c->regs[base_reg];
- }
- switch (index_reg) {
- case 4:
- break;
- default:
+ if (index_reg != 4)
c->modrm_ea += c->regs[index_reg] << scale;
- }
break;
case 5:
case 13:
--
1.5.6
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists