arm64: entry: Allow tramp_alias to access symbols after the 4K boundary
commit 6c5bf79b69f911560fbf82214c0971af6e58e682 upstream. Systems using kpti enter and exit the kernel through a trampoline mapping that is always mapped, even when the kernel is not. tramp_valias is a macro to find the address of a symbol in the trampoline mapping. Adding extra sets of vectors will expand the size of the entry.tramp.text section to beyond 4K. tramp_valias will be unable to generate addresses for symbols beyond 4K as it uses the 12 bit immediate of the add instruction. As there are now two registers available when tramp_alias is called, use the extra register to avoid the 4K limit of the 12 bit immediate. Change-Id: I51c7abfaf64dda4e89da8c66d898b8b9ef94d44f Reviewed-by:Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by:
Catalin Marinas <catalin.marinas@arm.com> [ Removed SDEI for backport ] Signed-off-by:
James Morse <james.morse@arm.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Git-commit: e4b37f25 Git-repo: https://android.googlesource.com/kernel/common/ Signed-off-by:
Srinivasarao Pathipati <quic_c_spathi@quicinc.com>
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