llvm-project.git/llvm/lib/Target/RISCV/RISCVIndirectBranchTracking.cpp, branch users/fmayer/spr/compiler-rt-ubsan-leave-bufferedstacktrace-uninit Unnamed repository; edit this file 'description' to name the repository. [RISCV] Insert simple landing pad for taken address labels. (#91855) 2024-08-06T14:04:48+00:00 Yeting Kuo 46629943+yetingk@users.noreply.github.com 2024-08-06T14:04:48+00:00 9fb196b469c9cdc5f44c0621b44289137cdd654a This patch implements simple landing pad labels ([pr]). When Zicfilp enabled, this patch inserts `lpad 0` at the beginning of basic blocks which are possible to be landed by indirect jumps. This patch also supports option riscv-landing-pad-label to make users cpable to set nonzero fixed labels. Using nonzero fixed label force setting t2 before indirect jumps. It's less portable but more strict than original implementation. [pr]: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/417 
This patch implements simple landing pad labels ([pr]). When Zicfilp
enabled, this patch inserts `lpad 0` at the beginning of basic blocks
which are possible to be landed by indirect jumps.
This patch also supports option riscv-landing-pad-label to make users
cpable to set nonzero fixed labels. Using nonzero fixed label force
setting t2 before indirect jumps. It's less portable but more strict
than original implementation.

[pr]: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/417