From 88fddcebf84c6c57c6a789bddeb0aaf41c1c9427 Mon Sep 17 00:00:00 2001 From: Nitin A Kamble Date: Tue, 30 Oct 2007 19:41:03 -0800 Subject: [PATCH] Implement emulation of instruction jb (conditional jump) opcodes: 0xe3 Signed-off-by: Nitin A Kamble --- drivers/kvm/x86_emulate.c | 25 ++++++++++++++++++++++++- 1 files changed, 24 insertions(+), 1 deletions(-) diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c index 579cfcf..1357355 100644 --- a/drivers/kvm/x86_emulate.c +++ b/drivers/kvm/x86_emulate.c @@ -165,7 +165,7 @@ static u16 opcode_table[256] = { /* 0xD8 - 0xDF */ 0, 0, 0, 0, 0, 0, 0, 0, /* 0xE0 - 0xE7 */ - 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, ImplicitOps, 0, 0, 0, 0, /* 0xE8 - 0xEF */ ImplicitOps, SrcImm|ImplicitOps, 0, SrcImmByte|ImplicitOps, 0, 0, 0, 0, /* 0xF0 - 0xF7 */ @@ -1446,6 +1446,29 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) c->src.val = c->regs[VCPU_REGS_RCX]; emulate_grp2(ctxt); break; + case 0xe3 : /* jb */ { + int rel = insn_fetch(s8, 1, c->eip); + int condition = 0; + if (test_cc(c->b, ctxt->eflags)) { + switch (c->op_bytes) { + case 2: + condition = + (0 == *(u16 *) &c->regs[VCPU_REGS_RCX]); + break; + case 4: + condition = + (0 == *(u32 *) &c->regs[VCPU_REGS_RCX]); + break; + case 8: + condition = + (0 == *(u64 *) &c->regs[VCPU_REGS_RCX]); + break; + } + } + if (condition) + JMP_REL(rel); + break; + } case 0xf6 ... 0xf7: /* Grp3 */ rc = emulate_grp3(ctxt, ops); if (rc != 0) -- 1.5.2.2