sparc64: Fix incorrect sigreturn stub function implementation

libc/sysdeps/linux/sparc64/Makefile.arch

@@ -5,7 +5,7 @@
 
 CSRC-y := __syscall_error.c sigaction.c
 SSRC-y := __longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S brk.S fork.S \
-	syscall.S pipe.S vfork.S clone.S
+	syscall.S pipe.S vfork.S clone.S sigreturn_stub.S
 
 CSRC-y += $(addprefix soft-fp/, \
 	qp_add.c qp_cmp.c qp_cmpe.c qp_div.c qp_dtoq.c qp_feq.c qp_fge.c \

libc/sysdeps/linux/sparc64/sigaction.c

@@ -26,7 +26,7 @@
 
 /* SPARC 64bit userland requires a kernel that has rt signals anyway. */
 
-static void __rt_sigreturn_stub (void);
+void __rt_sigreturn_stub (void);
 
 int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
 {
@@ -67,11 +67,3 @@ libc_hidden_weak(sigaction)
 # endif
 #endif
 
-static void
-__rt_sigreturn_stub (void)
-{
-  __asm__ ("mov %0, %%g1\n\t"
-	   "ta	0x6d\n\t"
-	   : /* no outputs */
-	   : "i" (__NR_rt_sigreturn));
-}

libc/sysdeps/linux/sparc64/sigreturn_stub.S

@@ -0,0 +1,10 @@
+#include <sysdep.h>
+
+        nop
+        nop
+
+ENTRY_NOCFI (__rt_sigreturn_stub)
+        mov     __NR_rt_sigreturn, %g1
+        ta      0x6d
+END_NOCFI (__rt_sigreturn_stub)
+

libc/sysdeps/linux/sparc64/sysdep.h

@@ -83,6 +83,15 @@ C_LABEL(name)                       \
     cfi_endproc;                    \
     .size name, . - name
 
+#define ENTRY_NOCFI(name)			\
+	.align	4;			\
+	.global	C_SYMBOL_NAME(name);	\
+	.type	name, @function;	    \
+C_LABEL(name)
+
+#define END_NOCFI(name)			    \
+	.size name, . - name
+
 #define LOC(name) .L##name
 
 #undef PSEUDO