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33 lines
1.1 KiB
33 lines
1.1 KiB
2 years ago
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commit 9de8011c328021f10588a8acb418daf5121d5f3d
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Author: Aurelien Jarno <aurelien@aurel32.net>
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Date: Tue Dec 14 22:44:35 2021 +0100
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riscv: align stack in clone [BZ #28702]
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The RISC-V ABI [1] mandates that "the stack pointer shall be aligned to
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a 128-bit boundary upon procedure entry". This as not the case in clone.
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This fixes the misc/tst-misalign-clone-internal and
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misc/tst-misalign-clone tests.
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Fixes bug 28702.
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[1] https://github.com/riscv-non-isa/riscv-elf-psabi-doc
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(cherry picked from commit d2e594d71509faf36cf851a69370db34a4f5fa65)
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diff --git a/sysdeps/unix/sysv/linux/riscv/clone.S b/sysdeps/unix/sysv/linux/riscv/clone.S
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index 12f91a20d3bb34f5..161e83c7e3786b8d 100644
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--- a/sysdeps/unix/sysv/linux/riscv/clone.S
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+++ b/sysdeps/unix/sysv/linux/riscv/clone.S
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@@ -32,6 +32,9 @@
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.text
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LEAF (__clone)
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+ /* Align stack to a 128-bit boundary as per RISC-V ABI. */
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+ andi a1,a1,ALMASK
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+
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/* Sanity check arguments. */
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beqz a0,L (invalid) /* No NULL function pointers. */
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beqz a1,L (invalid) /* No NULL stack pointers. */
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