KVM: x86 emulator: implement ENTER

Opcode C8.

Only ENTER with lexical nesting depth 0 is implemented, since others are
very rare.  We'll fail emulation if nonzero lexical depth is used so data
is not corrupted.

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 27 insertions, 1 deletions

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index acc647d63701..b4b326ebc835 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -454,6 +454,11 @@ static ulong stack_mask(struct x86_emulate_ctxt *ctxt)
         return ~0U >> ((ss.d ^ 1) * 16);  /* d=0: 0xffff; d=1: 0xffffffff */
 }
 
+static int stack_size(struct x86_emulate_ctxt *ctxt)
+{
+        return (__fls(stack_mask(ctxt)) + 1) >> 3;
+}
+
 /* Access/update address held in a register, based on addressing mode. */
 static inline unsigned long
 address_mask(struct x86_emulate_ctxt *ctxt, unsigned long reg)
@@ -1592,6 +1597,26 @@ static int em_popf(struct x86_emulate_ctxt *ctxt)
         return emulate_popf(ctxt, &ctxt->dst.val, ctxt->op_bytes);
 }
 
+static int em_enter(struct x86_emulate_ctxt *ctxt)
+{
+        int rc;
+        unsigned frame_size = ctxt->src.val;
+        unsigned nesting_level = ctxt->src2.val & 31;
+
+        if (nesting_level)
+                return X86EMUL_UNHANDLEABLE;
+
+        rc = push(ctxt, &ctxt->regs[VCPU_REGS_RBP], stack_size(ctxt));
+        if (rc != X86EMUL_CONTINUE)
+                return rc;
+        assign_masked(&ctxt->regs[VCPU_REGS_RBP], ctxt->regs[VCPU_REGS_RSP],
+                      stack_mask(ctxt));
+        assign_masked(&ctxt->regs[VCPU_REGS_RSP],
+                      ctxt->regs[VCPU_REGS_RSP] - frame_size,
+                      stack_mask(ctxt));
+        return X86EMUL_CONTINUE;
+}
+
 static int em_leave(struct x86_emulate_ctxt *ctxt)
 {
         assign_masked(&ctxt->regs[VCPU_REGS_RSP], ctxt->regs[VCPU_REGS_RBP],
@@ -3657,7 +3682,8 @@ static struct opcode opcode_table[256] = {
         I(DstReg | SrcMemFAddr | ModRM | No64 | Src2DS, em_lseg),
         G(ByteOp, group11), G(0, group11),
         /* 0xC8 - 0xCF */
-        N, I(Stack, em_leave), N, I(ImplicitOps | Stack, em_ret_far),
+        I(Stack | SrcImmU16 | Src2ImmByte, em_enter), I(Stack, em_leave),
+        N, I(ImplicitOps | Stack, em_ret_far),
         D(ImplicitOps), DI(SrcImmByte, intn),
         D(ImplicitOps | No64), II(ImplicitOps, em_iret, iret),
         /* 0xD0 - 0xD7 */