From fc48bfbc796e3825b6048df9146ce91c0baec0c8 Mon Sep 17 00:00:00 2001
From: Adhemerval Zanella <adhemerval.zanella@linaro.com>
Date: Sat, 17 Oct 2015 16:56:27 -0300
Subject: Fix SYSCALL_CANCEL for empty argumetns

This patch fixes the SYSCALL_CANCEL macro for usage with zero argument
number (for instance SYSCALL_CANCEL (pause)) using a similar approach
used for SOCKETCALL_CANCEL.

GLIBC build still does not hit this issue still since SYSCALL_CANCEL
is not currently being used for zero arguments calls.

Tested on i386, x86_64, powerpc64le, aarch64.

	* sysdeps/unix/sysdep.h (SYSCALL_CANCEL): Fix macro for zero argument
	syscalls.
	(__SYSCALL0): New macro.
	(__SYSCALL1): Likewise.
	(__SYSCALL2): Likewise.
	(__SYSCALL3): Likewise.
	(__SYSCALL4): Likewise.
	(__SYSCALL5): Likewise.
	(__SYSCALL6): Likewise.
	(__SYSCALL7): Likewise.
	(__SYSCALL_CONCAT_X): Likewise.
	(__SYSCALL_CONCAT): Likewise.
	(__SYSCALL_DIST): Likewise.
	(__SYSCALL_CALL): Likewise.
---
 sysdeps/unix/sysdep.h | 36 ++++++++++++++++++++++++++++--------
 1 file changed, 28 insertions(+), 8 deletions(-)

(limited to 'sysdeps/unix/sysdep.h')

diff --git a/sysdeps/unix/sysdep.h b/sysdeps/unix/sysdep.h
index 52dad58..5c8208f 100644
--- a/sysdeps/unix/sysdep.h
+++ b/sysdeps/unix/sysdep.h
@@ -24,22 +24,42 @@
 #define	SYSCALL__(name, args)	PSEUDO (__##name, name, args)
 #define	SYSCALL(name, args)	PSEUDO (name, name, args)
 
-/* Cancellation macros.  */
-#define __SYSCALL_NARGS_X(a,b,c,d,e,f,g,n,...) n
+#define __SYSCALL0(name) \
+  INLINE_SYSCALL (name, 0)
+#define __SYSCALL1(name, a1) \
+  INLINE_SYSCALL (name, 1, a1)
+#define __SYSCALL2(name, a1, a2) \
+  INLINE_SYSCALL (name, 2, a1, a2)
+#define __SYSCALL3(name, a1, a2, a3) \
+  INLINE_SYSCALL (name, 3, a1, a2, a3)
+#define __SYSCALL4(name, a1, a2, a3, a4) \
+  INLINE_SYSCALL (name, 4, a1, a2, a3, a4)
+#define __SYSCALL5(name, a1, a2, a3, a4, a5) \
+  INLINE_SYSCALL (name, 5, a1, a2, a3, a4, a5)
+#define __SYSCALL6(name, a1, a2, a3, a4, a5, a6) \
+  INLINE_SYSCALL (name, 6, a1, a2, a3, a4, a5, a6)
+#define __SYSCALL7(name, a1, a2, a3, a4, a5, a6, a7) \
+  INLINE_SYSCALL (name, 7, a1, a2, a3, a4, a5, a6, a7)
+
+#define __SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n
 #define __SYSCALL_NARGS(...) \
-  __SYSCALL_NARGS_X (__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0,)
+  __SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,)
+#define __SYSCALL_CONCAT_X(a,b)     a##b
+#define __SYSCALL_CONCAT(a,b)       __SYSCALL_CONCAT_X (a, b)
+#define __SYSCALL_DISP(b,...) \
+  __SYSCALL_CONCAT (b,__SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
+
+#define __SYSCALL_CALL(...) __SYSCALL_DISP (__SYSCALL, __VA_ARGS__)
 
-#define SYSCALL_CANCEL(name, ...) \
+#define SYSCALL_CANCEL(...) \
   ({									     \
     long int sc_ret;							     \
     if (SINGLE_THREAD_P) 						     \
-      sc_ret = INLINE_SYSCALL (name, __SYSCALL_NARGS(__VA_ARGS__),	     \
-			       __VA_ARGS__);				     \
+      sc_ret = __SYSCALL_CALL (__VA_ARGS__);   				     \
     else								     \
       {									     \
 	int sc_cancel_oldtype = LIBC_CANCEL_ASYNC ();			     \
-	sc_ret = INLINE_SYSCALL (name, __SYSCALL_NARGS (__VA_ARGS__),	     \
-				 __VA_ARGS__);				     \
+	sc_ret = __SYSCALL_CALL (__VA_ARGS__);				     \
         LIBC_CANCEL_RESET (sc_cancel_oldtype);				     \
       }									     \
     sc_ret;								     \
-- 
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