x29 (FP) is a callee saved register and should be restored on
return. Instead of backing up x29 and restoring it here, back up
sp in a register that we are allowed to overwrite.
This fixes crashes in checkasm on aarch64 since f1b3e1313851.
For some reason, gcc builds didn't crash, but clang builds do.
---
tests/checkasm/aarch64/checkasm.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tests/checkasm/aarch64/checkasm.S
b/tests/checkasm/aarch64/checkasm.S
index 65b3521..bc5ed9e 100644
--- a/tests/checkasm/aarch64/checkasm.S
+++ b/tests/checkasm/aarch64/checkasm.S
@@ -55,13 +55,13 @@ endconst
#define CLOBBER_STACK ((8*MAX_ARGS + 15) & ~15)
function checkasm_stack_clobber, export=1
- mov x29, sp
+ mov x3, sp
mov x2, #CLOBBER_STACK
1:
stp x0, x1, [sp, #-16]!
subs x2, x2, #16
b.gt 1b
- mov sp, x29
+ mov sp, x3
ret
endfunc
--
2.7.4
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