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commit 9de8011c328021f10588a8acb418daf5121d5f3d
Author: Aurelien Jarno <aurelien@aurel32.net>
Date: Tue Dec 14 22:44:35 2021 +0100
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
(cherry picked from commit d2e594d71509faf36cf851a69370db34a4f5fa65)
diff --git a/sysdeps/unix/sysv/linux/riscv/clone.S b/sysdeps/unix/sysv/linux/riscv/clone.S
index 12f91a20d3bb34f5..161e83c7e3786b8d 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. */