sparc: get rid of asm wrapper for nis_syscall()

just use current_pt_regs()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/sparc/kernel/entry.S

@@ -801,13 +801,6 @@ SUN_PI_(lda	[%l4] ASI_M_MMUREGS, %l5)	! read sfsr last
 	RESTORE_ALL
 
 	.align	4
-	.globl	sys_nis_syscall
-sys_nis_syscall:
-	mov	%o7, %l5
-	add	%sp, STACKFRAME_SZ, %o0		! pt_regs *regs arg
-	call	c_sys_nis_syscall
-	 mov	%l5, %o7
-
 sunos_execv:
 	.globl	sunos_execv
 	b	sys_execve

arch/sparc/kernel/sys_sparc_32.c

@@ -127,11 +127,10 @@ SYSCALL_DEFINE5(sparc_remap_file_pages, unsigned long, start, unsigned long, siz
 				    (pgoff >> (PAGE_SHIFT - 12)), flags);
 }
 
-/* we come to here via sys_nis_syscall so it can setup the regs argument */
-asmlinkage unsigned long
-c_sys_nis_syscall (struct pt_regs *regs)
+SYSCALL_DEFINE0(nis_syscall)
 {
 	static int count = 0;
+	struct pt_regs *regs = current_pt_regs();
 
 	if (count++ > 5)
 		return -ENOSYS;

arch/sparc/kernel/sys_sparc_64.c

@@ -480,10 +480,10 @@ SYSCALL_DEFINE5(64_mremap, unsigned long, addr,	unsigned long, old_len,
 	return sys_mremap(addr, old_len, new_len, flags, new_addr);
 }
 
-/* we come to here via sys_nis_syscall so it can setup the regs argument */
-asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
+SYSCALL_DEFINE0(nis_syscall)
 {
 	static int count;
+	struct pt_regs *regs = current_pt_regs();
 	
 	/* Don't make the system unusable, if someone goes stuck */
 	if (count++ > 5)

arch/sparc/kernel/syscalls.S

@@ -27,9 +27,6 @@ sys32_execveat:
 #endif
 
 	.align	32
-sys_nis_syscall:
-	ba,pt	%xcc, c_sys_nis_syscall
-	 add	%sp, PTREGS_OFF, %o0
 #ifdef CONFIG_COMPAT
 sys32_sigstack:
 	ba,pt	%xcc, do_sys32_sigstack

arch/sparc/kernel/systbls.h

@@ -11,7 +11,7 @@
 
 asmlinkage long sys_getpagesize(void);
 asmlinkage long sys_sparc_pipe(void);
-asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs);
+asmlinkage long sys_nis_syscall(void);
 asmlinkage long sys_getdomainname(char __user *name, int len);
 void do_rt_sigreturn(struct pt_regs *regs);
 asmlinkage long sys_mmap(unsigned long addr, unsigned long len,