[PATCH 2/7] KVM: x86 emulator: Support for declaring single operand fastops

Avi Kivity
2012-12-22T12:32:34Z

Signed-off-by: Avi Kivity <avi.kivity@gmail.com>
---
arch/x86/kvm/emulate.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index cdf7b97..9859df6 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"
@@ -432,6 +433,30 @@ 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; \
--
1.7.11.7