KVM: x86 emulator: Support for declaring single operand fastops

Acked-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi.kivity@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index dd71567d7c71..42c53c8071be 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -24,6 +24,7 @@
 #include "kvm_cache_regs.h"
 #include <linux/module.h>
 #include <asm/kvm_emulate.h>
+#include <linux/stringify.h>
 
 #include "x86.h"
 #include "tss.h"
@@ -439,6 +440,30 @@ static void invalidate_registers(struct x86_emulate_ctxt *ctxt)
                 }                                                       \
         } while (0)
 
+#define FOP_ALIGN ".align " __stringify(FASTOP_SIZE) " \n\t"
+#define FOP_RET   "ret \n\t"
+
+#define FOP_START(op) \
+        extern void em_##op(struct fastop *fake); \
+        asm(".pushsection .text, \"ax\" \n\t" \
+            ".global em_" #op " \n\t" \
+            FOP_ALIGN \
+            "em_" #op ": \n\t"
+
+#define FOP_END \
+            ".popsection")
+
+#define FOP1E(op,  dst) \
+        FOP_ALIGN #op " %" #dst " \n\t" FOP_RET
+
+#define FASTOP1(op) \
+        FOP_START(op) \
+        FOP1E(op##b, al) \
+        FOP1E(op##w, ax) \
+        FOP1E(op##l, eax) \
+        ON64(FOP1E(op##q, rax)) \
+        FOP_END
+
 #define __emulate_1op_rax_rdx(ctxt, _op, _suffix, _ex)                  \
         do {                                                            \
                 unsigned long _tmp;                                     \