Re: [PATCH 3/7] powerpc/64s: tool to flag direct branches from unrelocated interrupt vectors
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2016-10-19 10:57:25
Nicholas Piggin [off-list ref] writes:
Direct banches from code below __end_interrupts to code above
__end_interrupts when built with CONFIG_RELOCATABLE are disallowed
because they will break when the kernel is not located at 0.
Sample output:
WARNING: Unrelocated relative branches
c000000000000118 bl-> 0xc000000000038fb8 <pnv_restore_hyp_resource>
c00000000000013c b-> 0xc0000000001068a4 <kvm_start_guest>
c000000000000148 b-> 0xc00000000003919c <pnv_wakeup_loss>
c00000000000014c b-> 0xc00000000003923c <pnv_wakeup_noloss>
c0000000000005a4 b-> 0xc000000000106ffc <kvmppc_interrupt_hv>
c000000000001af0 b-> 0xc000000000106ffc <kvmppc_interrupt_hv>
c000000000001b24 b-> 0xc000000000106ffc <kvmppc_interrupt_hv>
c000000000001b58 b-> 0xc000000000106ffc <kvmppc_interrupt_hv>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/Makefile.postlink | 9 ++++-
arch/powerpc/tools/unrel_branch_check.sh | 56 ++++++++++++++++++++++++++++++++arch/powerpc/scripts is meant for these kind of scripts (there's only one there ATM, and yes we should move others in there). cheers