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| author | Jack Styles <jack.styles@arm.com> | 2024-10-28 08:22:38 +0000 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-10-28 08:22:38 +0000 |
| commit | 86f76c3b171f95fd0560339f2ad0f4449277cf8d (patch) | |
| tree | 2aeebc339b29d1a646195b1fa4e3cefd7ec42fbf /flang/lib/Frontend/CompilerInvocation.cpp | |
| parent | a4fd3dba6e285734bc635b0651a30dfeffedeada (diff) | |
| download | llvm-86f76c3b171f95fd0560339f2ad0f4449277cf8d.zip llvm-86f76c3b171f95fd0560339f2ad0f4449277cf8d.tar.gz llvm-86f76c3b171f95fd0560339f2ad0f4449277cf8d.tar.bz2 | |
[AArch64][Libunwind] Add Support for FEAT_PAuthLR DWARF Instruction (#112171)
As part of FEAT_PAuthLR, a new DWARF Frame Instruction was introduced,
`DW_CFA_AARCH64_negate_ra_state_with_pc`. This instructs Libunwind that
the PC has been used with the signing instruction. This change includes
three commits
- Libunwind support for the newly introduced DWARF Instruction
- CodeGen Support for the DWARF Instructions
- Reversing the changes made in #96377. Due to
`DW_CFA_AARCH64_negate_ra_state_with_pc`'s requirements to be placed
immediately after the signing instruction, this would mean the CFI
Instruction location was not consistent with the generated location when
not using FEAT_PAuthLR. The commit reverses the changes and makes the
location consistent across the different branch protection options.
While this does have a code size effect, this is a negligible one.
For the ABI information, see here:
https://github.com/ARM-software/abi-aa/blob/853286c7ab66048e4b819682ce17f567b77a0291/aadwarf64/aadwarf64.rst#id23
Diffstat (limited to 'flang/lib/Frontend/CompilerInvocation.cpp')
0 files changed, 0 insertions, 0 deletions