tree aa036b96b414c8702dc8ea8d835d5bdbbfec561f
parent f5007dbf4da729baa850b33a64dc3cc53757bdf8
author Christophe Leroy <christophe.leroy@csgroup.eu> 1629791795 +0000
committer Michael Ellerman <mpe@ellerman.id.au> 1629862547 +1000

powerpc: Avoid link stack corruption in misc asm functions

bl;mflr is used at several places to get code position.

Use bcl 20,31,+4 instead of bl in order to preserve link stack.

See commit c974809a26a1 ("powerpc/vdso: Avoid link stack corruption
in __get_datapage()") for details.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c6eabb4fb6c156f75d56dcbcc6f243e5ac0fba42.1629791763.git.christophe.leroy@csgroup.eu