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hppa: Align __clone stack argument to 8 bytes (Bug 25066)

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The hppa architecture requires strict alignment for loads and stores.
As a result, the minimum stack alignment that will work is 8 bytes.
This patch adjusts __clone() to align the stack argument passed to it.
It also adjusts slightly some formatting.

This fixes the nptl/tst-tls1 test.
This commit is contained in:
John David Anglin 2019-11-03 16:28:01 -05:00
parent 42893aa38f
commit e4c23a029a
1 changed files with 7 additions and 2 deletions
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9
sysdeps/unix/sysv/linux/hppa/clone.S
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@ -73,13 +73,18 @@ ENTRY(__clone)
#endif
/* Sanity check arguments. */
comib,=,n 0, %arg0, .LerrorSanity /* no NULL function pointers */
comib,=,n 0, %arg1, .LerrorSanity /* no NULL stack pointers */
comib,=,n 0,%arg0,.LerrorSanity /* no NULL function pointers */
comib,=,n 0,%arg1,.LerrorSanity /* no NULL stack pointers */
/* Ensure stack argument is 8-byte aligned. */
ldo 7(%r25),%r25
depi 0,31,3,%r25
/* Save the function pointer, arg, and flags on the new stack. */
stwm %r26, 64(%r25)
stw %r23, -60(%r25)
stw %r24, -56(%r25)
/* Clone arguments are (int flags, void * child_stack) */
copy %r24, %r26 /* flags are first */
/* User stack pointer is in the correct register already */