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fix arm __a_barrier_oldkuser when built as thumb

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as noted in commit 05870abeaa, mov lr,pc
is not a valid method for saving the return address in code that might
be built as thumb.

this one is unlikely to matter, since any ISA level that has thumb2
should also have native implementations of atomics that don't involve
kuser_helper, and the affected code is only used on very old kernels
to begin with.
This commit is contained in:
Rich Felker 2019-09-11 13:21:28 -04:00
parent 05870abeaa
commit b0301f47f3
1 changed files with 2 additions and 2 deletions
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4
src/thread/arm/atomics.s
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@ -15,10 +15,10 @@ __a_barrier_oldkuser:
mov r1,r0
mov r2,sp
ldr ip,=0xffff0fc0
mov lr,pc
mov pc,ip
bl 1f
pop {r0,r1,r2,r3,ip,lr}
bx lr
1: bx ip
.global __a_barrier_v6
.hidden __a_barrier_v6