From 035e048fd68141779c147e387f608e8da6713d57 Mon Sep 17 00:00:00 2001
From: Waldemar Brodkorb <wbx@openadk.org>
Date: Wed, 8 May 2024 11:12:30 +0200
Subject: sparc64: Fix incorrect sigreturn stub function implementation

---
 libc/sysdeps/linux/sparc64/Makefile.arch    |  2 +-
 libc/sysdeps/linux/sparc64/sigaction.c      | 10 +---------
 libc/sysdeps/linux/sparc64/sigreturn_stub.S | 10 ++++++++++
 libc/sysdeps/linux/sparc64/sysdep.h         |  9 +++++++++
 4 files changed, 21 insertions(+), 10 deletions(-)
 create mode 100644 libc/sysdeps/linux/sparc64/sigreturn_stub.S

diff --git a/libc/sysdeps/linux/sparc64/Makefile.arch b/libc/sysdeps/linux/sparc64/Makefile.arch
index 37b539b3b..cc4000b78 100644
--- a/libc/sysdeps/linux/sparc64/Makefile.arch
+++ b/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 \
diff --git a/libc/sysdeps/linux/sparc64/sigaction.c b/libc/sysdeps/linux/sparc64/sigaction.c
index d8aaad0fb..b28fa659a 100644
--- a/libc/sysdeps/linux/sparc64/sigaction.c
+++ b/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));
-}
diff --git a/libc/sysdeps/linux/sparc64/sigreturn_stub.S b/libc/sysdeps/linux/sparc64/sigreturn_stub.S
new file mode 100644
index 000000000..a5c9bb47f
--- /dev/null
+++ b/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)
+
diff --git a/libc/sysdeps/linux/sparc64/sysdep.h b/libc/sysdeps/linux/sparc64/sysdep.h
index 31008c34b..5a4c36348 100644
--- a/libc/sysdeps/linux/sparc64/sysdep.h
+++ b/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
-- 
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