diff options
| author |   Avi Kivity <avi@redhat.com> | 2009-01-05 11:12:40 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-03-24 11:03:00 +0200 |
| commit | 350f69dcd169d536307aa4a8c38c480e3a51c0db (patch) | |
| tree | 9c8ba8c8931f8e8fc7b22bca423ab25724354303 /arch | |
| parent | KVM: VMX: Prevent exit handler from running if emulating due to invalid state (diff) | |
| download | linux-dev-350f69dcd169d536307aa4a8c38c480e3a51c0db.tar.xz linux-dev-350f69dcd169d536307aa4a8c38c480e3a51c0db.zip | |
KVM: x86 emulator: Make emulate_pop() a little more generic
Allow emulate_pop() to read into arbitrary memory rather than just the
source operand. Needed for complicated instructions like far returns.
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/x86_emulate.c | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c index 54fb09889a80..94459f313f12 100644 --- a/arch/x86/kvm/x86_emulate.c +++ b/arch/x86/kvm/x86_emulate.c @@ -1136,18 +1136,19 @@ static inline void emulate_push(struct x86_emulate_ctxt *ctxt) } static int emulate_pop(struct x86_emulate_ctxt *ctxt, - struct x86_emulate_ops *ops) + struct x86_emulate_ops *ops, + void *dest, int len) { struct decode_cache *c = &ctxt->decode; int rc; rc = ops->read_emulated(register_address(c, ss_base(ctxt), c->regs[VCPU_REGS_RSP]), - &c->src.val, c->src.bytes, ctxt->vcpu); + dest, len, ctxt->vcpu); if (rc != 0) return rc; - register_address_increment(c, &c->regs[VCPU_REGS_RSP], c->src.bytes); + register_address_increment(c, &c->regs[VCPU_REGS_RSP], len); return rc; } @@ -1157,11 +1158,9 @@ static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt, struct decode_cache *c = &ctxt->decode; int rc; - c->src.bytes = c->dst.bytes; - rc = emulate_pop(ctxt, ops); + rc = emulate_pop(ctxt, ops, &c->dst.val, c->dst.bytes); if (rc != 0) return rc; - c->dst.val = c->src.val; return 0; } @@ -1467,11 +1466,9 @@ special_insn: break; case 0x58 ... 0x5f: /* pop reg */ pop_instruction: - c->src.bytes = c->op_bytes; - rc = emulate_pop(ctxt, ops); + rc = emulate_pop(ctxt, ops, &c->dst.val, c->op_bytes); if (rc != 0) goto done; - c->dst.val = c->src.val; break; case 0x63: /* movsxd */ if (ctxt->mode != X86EMUL_MODE_PROT64) |