1 files changed, 19 insertions, 0 deletions
diff --git a/mpi/amd64/func_abi.h b/mpi/amd64/func_abi.h
new file mode 100644
index 00000000..ce446744
--- /dev/null
+++ b/mpi/amd64/func_abi.h
@@ -0,0 +1,19 @@
+#ifdef USE_MS_ABI
+ /* Store registers and move four first input arguments from MS ABI to
+  * SYSV ABI.  */
+ #define FUNC_ENTRY() \
+	pushq %rsi; \
+	pushq %rdi; \
+	movq %rdx, %rsi; \
+	movq %rcx, %rdi; \
+	movq %r8, %rdx; \
+	movq %r9, %rcx;
+
+ /* Restore registers.  */
+ #define FUNC_EXIT() \
+	popq %rdi; \
+	popq %rsi;
+#else
+ #define FUNC_ENTRY() /**/
+ #define FUNC_EXIT() /**/
+#endif