[all-commits] [llvm/llvm-project] 587eae: [sanitizer_common] Handle ptrace on Linux/sparc64 ...

[Rainer Orth via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 587eaefe876f8fd2cd8b9b0862d81f35b7f9ebce
      https://github.com/llvm/llvm-project/commit/587eaefe876f8fd2cd8b9b0862d81f35b7f9ebce
  Author: Rainer Orth <ro at gcc.gnu.org>
  Date:   2024-09-30 (Mon, 30 Sep 2024)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
    M compiler-rt/lib/sanitizer_common/sanitizer_common_syscalls.inc
    M compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
    M compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
    M compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
    M compiler-rt/test/asan/TestCases/Linux/ptrace.cpp

  Log Message:
  -----------
  [sanitizer_common] Handle ptrace on Linux/sparc64 (#109310)

When ASan testing is enabled on SPARC as per PR #107405, the
```
  AddressSanitizer-sparc-linux :: TestCases/Linux/ptrace.cpp
```
`FAIL`s on Linux/sparc64. This happens because the `ptrace` interceptor
has no support for that target at all.

This patch adds the missing parts and accounts for a couple of issues
specific to this target:
- In some cases, SPARC just needs to be included in the list of
supported targets.
- Besides, the types used by the `PTRACE_GETREGS` and `PTRACE_GETFPREGS`
requests need to be filled in.
- `ptrace` has a weird quirk on this target: for a couple of requests,
the meaning of the `data` and `addr` args is reversed. All of the
`Linux/ptrace.cpp` test and the interceptor, pre-syscall and
post-syscall hooks need to account for that swap in their checks.

Tested on `sparc64-unknown-linux-gnu` and `x86_64-pc-linux-gnu`.



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