Fangrui Song

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Results 147 comments of Fangrui Song

mold tests failed with unversioned symbols

I made a comment about more context https://sourceware.org/bugzilla/show_bug.cgi?id=33577#c34 > GNU ld has used index 0 for unversioned undefined symbols both before version 2.35 (see https://sourceware.org/PR26002 in 2020) and in the...

[BACKEND] Update LLVM version to llvm/llvm-project@9ddfe62

Say my llvm-project build is at `/tmp/Rel`. `/tmp/Rel/include/llvm/Config/abi-breaking.h` defines `LLVM_ABI_BREAKING_CHECKS`. `llvm/include/llvm/ADT/Hashing.h` includes `abi-breaking.h` and gets the `LLVM_ABI_BREAKING_CHECKS` value from the LLVM build. Whether or not the user build has a...

[lld] Add ability to have OUTPUT_FORMAT(binary) in linker script for ld.lld

This needs a test in `oformat-binary.s`. A different `OUTPUT_FORMAT` might change `oFormatBinary` to false.

[lld] Add ability to have OUTPUT_FORMAT(binary) in linker script for ld.lld

> > This needs a test in `oformat-binary.s`. A different `OUTPUT_FORMAT` might change `oFormatBinary` to false. > > Okay, I want to write test(s) for this but I'm not sure...

[sysvabi64] document requirement for bti c in more detail

Functions with LR signing gets PACI[AB]SP{,PC}. They have an implicit BTI. If PACI[AB]SP is absent (leaf functions, or when PAuth is not enabled), Clang adds "bti c" to every candidate...

static linkers (lld and GNU ld) out of sync with aaelf64 for GOT relocations with addends.

> When doing a :got: and :got_lo12: expression to a local symbol, the GNU and LLVM assemblers convert this to a GOT generating relocation to the section symbol + addend....

Need dynamic tag to reflect .note.gnu.prop and/or .note.AARCH64-PAUTH-ABI-tag section addresses

Linkers create PT_NOTE program headers from SHT_NOTE sections. There should not be too much concern as in the absence of a dedicated `PT_` program header, rtld can process PT_NOTE. Actually,...