From d2e594d71509faf36cf851a69370db34a4f5fa65 Mon Sep 17 00:00:00 2001
From: Aurelien Jarno <aurelien@aurel32.net>
Date: Tue, 14 Dec 2021 22:44:35 +0100
Subject: [PATCH] riscv: align stack in clone [BZ #28702]

The RISC-V ABI [1] mandates that "the stack pointer shall be aligned to
a 128-bit boundary upon procedure entry". This as not the case in clone.

This fixes the misc/tst-misalign-clone-internal and
misc/tst-misalign-clone tests.

Fixes bug 28702.

[1] https://github.com/riscv-non-isa/riscv-elf-psabi-doc
---
 sysdeps/unix/sysv/linux/riscv/clone.S | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/riscv/clone.S b/sysdeps/unix/sysv/linux/riscv/clone.S
index 12f91a20d3..161e83c7e3 100644
--- a/sysdeps/unix/sysv/linux/riscv/clone.S
+++ b/sysdeps/unix/sysv/linux/riscv/clone.S
@@ -32,6 +32,9 @@
 	.text
 LEAF (__clone)
 
+	/* Align stack to a 128-bit boundary as per RISC-V ABI.  */
+	andi		a1,a1,ALMASK
+
 	/* Sanity check arguments.  */
 	beqz		a0,L (invalid)	/* No NULL function pointers.  */
 	beqz		a1,L (invalid)	/* No NULL stack pointers.  */
-- 
2.39.2

