[all-commits] [llvm/llvm-project] 992ee5: Add support for Alpha to libsanitizer (#194161)

[Matt Turner via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 992ee5934c1142c00dc09589380b8277cc43ef09
      https://github.com/llvm/llvm-project/commit/992ee5934c1142c00dc09589380b8277cc43ef09
  Author: Matt Turner <mattst88 at gmail.com>
  Date:   2026-05-28 (Thu, 28 May 2026)

  Changed paths:
    M compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake
    M compiler-rt/cmake/base-config-ix.cmake
    M compiler-rt/lib/asan/asan_allocator.h
    M compiler-rt/lib/asan/asan_mapping.h
    M compiler-rt/lib/sanitizer_common/sanitizer_asm.h
    M compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
    M compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
    M compiler-rt/lib/sanitizer_common/sanitizer_platform.h
    M compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_linux.cpp
    M compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
    M compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
    A compiler-rt/lib/sanitizer_common/sanitizer_syscall_linux_alpha.inc

  Log Message:
  -----------
  Add support for Alpha to libsanitizer (#194161)

Add support for [Alpha](https://en.wikipedia.org/wiki/DEC_Alpha) to
libsanitizer.

- [sanitizer] Add SANITIZER_ALPHA platform macro
- [sanitizer] Add Linux/Alpha syscall implementation
- [sanitizer] Skip __old_kernel_stat check on Alpha
- [sanitizer] Use statx for stat syscalls on Linux/Alpha
- [sanitizer] Add GetPcSpBp signal context support for Alpha
- [sanitizer] Add Alpha struct size constants
- [sanitizer] Add Alpha ioctl encoding constants
- [compiler-rt] sanitizer: Alpha struct sigaction has no sa_restorer
- [compiler-rt] sanitizer: Disable interceptor trampoline on Alpha
- [compiler-rt] sanitizer: Add Alpha __sanitizer_dirent layout
- [compiler-rt] sanitizer: Add Alpha ThreadDescriptorSizeFallback()
- [compiler-rt] Enable Alpha Linux target
- [compiler-rt] Use fixed shadow offset 0x10000000000 (1T) for Alpha
- [compiler-rt][ASan] Limit allocator to 512G on Alpha

Tested by porting the changes to gcc's downstream libsanitizer and
building and running the libunwind test suite with UBSan / ASan enabled.



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