| From | Brian Gerst <> | Date | Fri, 13 Mar 2020 12:46:05 -0400 | Subject | Re: [RFC][PATCH 04/16] objtool: Annotate identity_mapped() |
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On Thu, Mar 12, 2020 at 9:53 AM Peter Zijlstra <peterz@infradead.org> wrote: > > Normally identity_mapped is not visible to objtool, due to: > > arch/x86/kernel/Makefile:OBJECT_FILES_NON_STANDARD_relocate_kernel_$(BITS).o := y > > However, when we want to run objtool on vmlinux.o there is no hiding > it. Without the annotation we'll get complaints about the: > call 1f 1: popq %r8 subq $(1b - relocate_kernel), %r8
It looks to me that this code is simply trying to get the virtual address of relocate_kernel using the old 32-bit method of PIC address calculation. On 64-bit can be done with leaq relocate_kernel(%rip), %r8.
-- Brian Gerst
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