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f23292d8a71d5795784f7f6977b6f030ac4adcb3
_sigfe_maybe returned on both outcomes of the 'TLS initialized?' check,
so it never entered _sigfe and never called the wrapped function.
The wrapper enters it with 'br' after reserving 16 bytes and storing the
real function address at [sp], but AArch64 'ret' branches to x30 and
pops nothing, so the bypass path returned without calling the function
while leaking the wrapper slot.
Branch to a shared L_sigfe_entry label when TLS is valid, mirroring the
x86_64 path's "je 1f", and otherwise pop the wrapper slot and tail-call
the real function through it.
The CYGTLS_INITIALIZED comparison also built 0x173fc763 instead of
0xc763173f, as the movz/movk halves were swapped, so it could never
match.
Fixes: ae46abc226 ("Cygwin: gendef: add _sigfe_maybe for TLS initialization checks on AArch64")
Signed-off-by: Aswin Kalies <aswin.kalies@multicorewareinc.com>
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