tree 23342ce500d0e1ff165fade0434062094f88c0e9
parent 77679c9853dca92eb58e9be0c6f1ce28ded6f738
author Yonghong Song <yhs@fb.com> 1566079920 +0000
committer Yonghong Song <yhs@fb.com> 1566079920 +0000

[BPF] Fix bpf llvm-objdump issues.

Commit https://reviews.llvm.org/D57939 ("[DWARF] Refactor
RelocVisitor and fix computation of SHT_RELA-typed relocation entries)
made a change for relocation resolution when operating
on an object file.

The change unfortunately broke BPF as given SymbolValue (S) and
Addent (A), previously relocation is resolved to
    S + A
and after the change, it is resolved to
    S

This patch fixed the issue by resolving relocation correctly.

It looks not all relocation resolution reaches here and I did not
trace down exactly when. But I do find if the object file includes
codes in two different ELF sections than default ".text",
the above bug will be triggered.

This patch included a trivial two function source code to
demonstrate this issue. The relocation for .debug_loc is resolved
incorrectly due to this and llvm-objdump cannot display source
annotated assembly.

Differential Revision: https://reviews.llvm.org/D66372

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369199 91177308-0d34-0410-b5e6-96231b3b80d8