hppa: Fix miscompilation of sched_setaffinity() [BZ #18480]

The attached change fixes the miscompilation of sched_setaffinity() on
hppa.  This is an old problem that was fixed on other architectures using
a similar approach to the attached change.  See:
https://sourceware.org/ml/libc-hacker/2004-04/msg00016.html

Build tested on trunk.  Patch has been applied to debian glibc for some time.

ChangeLog

@@ -1,3 +1,15 @@
+2015-08-09  John David Anglin  <danglin@gcc.gnu.org>
+
+	[BZ #18480]
+	* sysdeps/unix/sysv/linux/hppa/sysdep.h (LOAD_ARGS_0, LOAD_ARGS_1,
+	LOAD_ARGS_2, LOAD_ARGS_3, LOAD_ARGS_4, LOAD_ARGS_5, LOAD_ARGS_6):
+	Define.
+	(LOAD_REGS_0, LOAD_REGS_1, LOAD_REGS_2, LOAD_REGS_3, LOAD_REGS_4,
+	LOAD_REGS_5, LOAD_REGS_6): Update.
+	(INTERNAL_SYSCALL): Update using new LOAD defines.
+	(INTERNAL_SYSCALL_NCS): Likewise.
+	* sysdeps/unix/sysv/linux/hppa/syscall.c (syscall): Likewise.
+
 2015-08-08  Paul Pluzhnikov  <ppluzhnikov@google.com>
 
 	[BZ #16734]

NEWS

@@ -8,7 +8,8 @@ using `glibc' in the "product" field.
 Version 2.23
 
 * The following bugs are resolved with this release:
-  16517, 16519, 17905, 18265, 18525, 18618, 18647, 18661, 18787.
+
+  16517, 16519, 17905, 18480, 18265, 18525, 18618, 18647, 18661, 18787.
 
 Version 2.22
 

sysdeps/unix/sysv/linux/hppa/syscall.c

@@ -43,9 +43,10 @@ syscall (long int __sysno, ...)
   va_end (args);
 
   {
+    LOAD_ARGS_6 (arg0, arg1, arg2, arg3, arg4, arg5)
     register unsigned long int __res asm("r28");
     PIC_REG_DEF
-    LOAD_ARGS_6 (arg0, arg1, arg2, arg3, arg4, arg5)
+    LOAD_REGS_6
     asm volatile (SAVE_ASM_PIC
 		  "	ble  0x100(%%sr2, %%r0)	\n"
 		  "	copy %1, %%r20		\n"

sysdeps/unix/sysv/linux/hppa/sysdep.h

@@ -400,9 +400,10 @@ L(pre_end):					ASM_LINE_SEP	\
 ({									\
 	long __sys_res;							\
 	{								\
+		LOAD_ARGS_##nr(args)					\
 		register unsigned long __res asm("r28");		\
 		PIC_REG_DEF						\
-		LOAD_ARGS_##nr(args)					\
+		LOAD_REGS_##nr						\
 		/* FIXME: HACK save/load r19 around syscall */		\
 		asm volatile(						\
 			SAVE_ASM_PIC					\
@@ -425,9 +426,10 @@ L(pre_end):					ASM_LINE_SEP	\
 ({									\
 	long __sys_res;							\
 	{								\
+		LOAD_ARGS_##nr(args)					\
 		register unsigned long __res asm("r28");		\
 		PIC_REG_DEF						\
-		LOAD_ARGS_##nr(args)					\
+		LOAD_REGS_##nr						\
 		/* FIXME: HACK save/load r19 around syscall */		\
 		asm volatile(						\
 			SAVE_ASM_PIC					\
@@ -443,27 +445,44 @@ L(pre_end):					ASM_LINE_SEP	\
 	__sys_res;							\
  })
 
-
-
 #define LOAD_ARGS_0()
-#define LOAD_ARGS_1(r26)						\
-  register unsigned long __r26 __asm__("r26") = (unsigned long)(r26);	\
+#define LOAD_REGS_0
+#define LOAD_ARGS_1(a1)							\
+  register unsigned long __x26 = (unsigned long)(a1);			\
   LOAD_ARGS_0()
-#define LOAD_ARGS_2(r26,r25)						\
-  register unsigned long __r25 __asm__("r25") = (unsigned long)(r25);	\
-  LOAD_ARGS_1(r26)
-#define LOAD_ARGS_3(r26,r25,r24)					\
-  register unsigned long __r24 __asm__("r24") = (unsigned long)(r24);	\
-  LOAD_ARGS_2(r26,r25)
-#define LOAD_ARGS_4(r26,r25,r24,r23)					\
-  register unsigned long __r23 __asm__("r23") = (unsigned long)(r23);	\
-  LOAD_ARGS_3(r26,r25,r24)
-#define LOAD_ARGS_5(r26,r25,r24,r23,r22)				\
-  register unsigned long __r22 __asm__("r22") = (unsigned long)(r22);	\
-  LOAD_ARGS_4(r26,r25,r24,r23)
-#define LOAD_ARGS_6(r26,r25,r24,r23,r22,r21)				\
-  register unsigned long __r21 __asm__("r21") = (unsigned long)(r21);	\
-  LOAD_ARGS_5(r26,r25,r24,r23,r22)
+#define LOAD_REGS_1							\
+  register unsigned long __r26 __asm__("r26") = __x26;			\
+  LOAD_REGS_0
+#define LOAD_ARGS_2(a1,a2)						\
+  register unsigned long __x25 = (unsigned long)(a2);			\
+  LOAD_ARGS_1(a1)
+#define LOAD_REGS_2							\
+  register unsigned long __r25 __asm__("r25") = __x25;			\
+  LOAD_REGS_1
+#define LOAD_ARGS_3(a1,a2,a3)						\
+  register unsigned long __x24 = (unsigned long)(a3);			\
+  LOAD_ARGS_2(a1,a2)
+#define LOAD_REGS_3							\
+  register unsigned long __r24 __asm__("r24") = __x24;			\
+  LOAD_REGS_2
+#define LOAD_ARGS_4(a1,a2,a3,a4)					\
+  register unsigned long __x23 = (unsigned long)(a4);			\
+  LOAD_ARGS_3(a1,a2,a3)
+#define LOAD_REGS_4							\
+  register unsigned long __r23 __asm__("r23") = __x23;			\
+  LOAD_REGS_3
+#define LOAD_ARGS_5(a1,a2,a3,a4,a5)					\
+  register unsigned long __x22 = (unsigned long)(a5);			\
+  LOAD_ARGS_4(a1,a2,a3,a4)
+#define LOAD_REGS_5							\
+  register unsigned long __r22 __asm__("r22") = __x22;			\
+  LOAD_REGS_4
+#define LOAD_ARGS_6(a1,a2,a3,a4,a5,a6)					\
+  register unsigned long __x21 = (unsigned long)(a6);			\
+  LOAD_ARGS_5(a1,a2,a3,a4,a5)
+#define LOAD_REGS_6							\
+  register unsigned long __r21 __asm__("r21") = __x21;			\
+  LOAD_REGS_5
 
 /* Even with zero args we use r20 for the syscall number */
 #define ASM_ARGS_0