[LoongArch][sanitizer] Fix SC_ADDRERR_{RD,WR} missing in the musl environment

[heiher]

Fixes #108550

[heiher]

cc @xen0n @xry111

[llvmbot]

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: hev (heiher)

Changes

Fixes #108550

---

Full diff: https://github.com/llvm/llvm-project/pull/108557.diff

1 Files Affected:

• (modified) compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp (+12)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
index 16d06c69a38f32..f4a2f46c6ea022 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
@@ -2018,6 +2018,18 @@ SignalContext::WriteFlag SignalContext::GetWriteFlag() const {
     return Unknown;
   return esr & ESR_ELx_WNR ? Write : Read;
 #  elif defined(__loongarch__)
+     // In the musl environment, the Linux kernel uapi sigcontext.h is not
+     // included in signal.h. To avoid missing the SC_ADDRERR_{RD,WR} macros,
+     // copy them here. The LoongArch Linux kernel uapi is already stable,
+     // so there's no need to worry about the value changing.
+#    ifndef SC_ADDRERR_RD
+       // Address error was due to memory load
+#      define SC_ADDRERR_RD		(1 << 30)
+#    endif
+#    ifndef SC_ADDRERR_WR
+       // Address error was due to memory store
+#      define SC_ADDRERR_WR		(1 << 31)
+#    endif
   u32 flags = ucontext->uc_mcontext.__flags;
   if (flags & SC_ADDRERR_RD)
     return SignalContext::Read;

[github-actions]

✅ With the latest revision this PR passed the C/C++ code formatter.

[SixWeining]

LGTM

[heiher]

/cherry-pick 1825cf2

[llvmbot]

/pull-request #109110