ARM: 8975/1: module: fix handling of unwind init sections
authorVincent Whitchurch <vincent.whitchurch@axis.com>
Thu, 14 May 2020 10:36:42 +0000 (11:36 +0100)
committerRussell King <rmk+kernel@armlinux.org.uk>
Tue, 19 May 2020 10:42:15 +0000 (11:42 +0100)
commitcdcb07e45a911a5be9d38bb1aff1f6de019503b2
tree57648ba1a2c860c637dafa04ec550e3513f30973
parent0697e5e06ea0d96e2d1508104ff3b13e4dddc4bb
ARM: 8975/1: module: fix handling of unwind init sections

Unwind information for init sections is placed in .ARM.exidx.init.text
and .ARM.extab.init.text.  The module core doesn't know that these are
init sections so they are allocated along with the core sections, and if
the core and init sections get allocated in different memory regions
(which is possible with CONFIG_ARM_MODULE_PLTS=y) and they can't reach
each other, relocation fails:

  final section addresses:
   ...
   0x7f800000 .init.text
..
   0xcbb54078 .ARM.exidx.init.text
..

 section 16 reloc 0 sym '': relocation 42 out of range (0xcbb54078 ->
 0x7f800000)

Fix this by informing the module core that these sections are init
sections, and by removing the init unwind tables before the module core
frees the init sections.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
arch/arm/kernel/module.c