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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
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
This commit is contained in:
Aurelien Jarno 2021-12-14 22:44:35 +01:00
parent 94058f6cde
commit d2e594d715
1 changed files with 3 additions and 0 deletions
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3
sysdeps/unix/sysv/linux/riscv/clone.S
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@ -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. */