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| author | Fangrui Song <i@maskray.me> | 2023-06-20 22:40:56 -0700 |
|---|---|---|
| committer | Fangrui Song <i@maskray.me> | 2023-06-20 22:40:56 -0700 |
| commit | e0a6561ec9ec10f8c0c43b15dfcbbc3c57d37d3f (patch) | |
| tree | f0c2b2f2e56467ec0e22bec48cdcb3326e6a1f54 /llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp | |
| parent | 75d70b73063fb5abd12643207c6dda867d955df6 (diff) | |
| download | llvm-e0a6561ec9ec10f8c0c43b15dfcbbc3c57d37d3f.zip llvm-e0a6561ec9ec10f8c0c43b15dfcbbc3c57d37d3f.tar.gz llvm-e0a6561ec9ec10f8c0c43b15dfcbbc3c57d37d3f.tar.bz2 | |
[XRay] Make xray_fn_idx entries PC-relative
As mentioned by commit c5d38924dc6688c15b3fa133abeb3626e8f0767c (Apr 2020),
PC-relative entries avoid dynamic relocations and can therefore make the
section read-only.
This is similar to D78082 and D78590. We cannot commit to support
compiler/runtime built at different versions, so just don't play with versions.
For Mach-O support (incomplete yet), we use non-temporary `lxray_fn_idx[0-9]+`
symbols. Label differences are represented as a pair of UNSIGNED and SUBTRACTOR
relocations. The SUBTRACTOR external relocation requires r_extern==1 (needs to
reference a symbol table entry) which can be satisfied by `lxray_fn_idx[0-9]+`.
A `lxray_fn_idx[0-9]+` symbol also serves as the atom for this dead-strippable
section (follow-up to commit b9a134aa629de23a1dcf4be32e946e4e308fc64d).
Differential Revision: https://reviews.llvm.org/D152661
Diffstat (limited to 'llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp')
0 files changed, 0 insertions, 0 deletions