tree abf2ef33cd06a0cb680cac4bebd4d14757eae009
parent 41a506ef71eb38d94fe133f565c87c3e06ccc072
author Michael Ellerman <mpe@ellerman.id.au> 1690885610 +1000
committer Michael Ellerman <mpe@ellerman.id.au> 1690887687 +1000

powerpc/64e: Fix secondary thread bringup for ELFv2 kernels

When booting on e6500 with an ELF v2 ABI kernel, the secondary threads do
not start correctly:

    [    0.051118] smp: Bringing up secondary CPUs ...
    [    5.072700] Processor 1 is stuck.

This occurs because the startup code is written to use function
descriptors when loading the entry point for the secondary threads. When
building with ELF v2 ABI there are no function descriptors, and the code
loads junk values for the entry point address.

Fix it by using ppc_function_entry() in C, and DOTSYM() in asm, both of
which work correctly for ELF v2 ABI as well as ELF v1 ABI kernels.

Fixes: 8c5fa3b5c4df ("powerpc/64: Make ELFv2 the default for big-endian builds")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230801102650.48705-1-mpe@ellerman.id.au