[compiler-rt] 1825cf2 - [LoongArch][sanitizer] Fix SC_ADDRERR_{RD, WR} missing in the musl environment (#108557)

[via llvm-commits]

Author: hev
Date: 2024-09-14T11:19:34+08:00
New Revision: 1825cf28dc83113200b623ebcf063eea35ade79a

URL: https://github.com/llvm/llvm-project/commit/1825cf28dc83113200b623ebcf063eea35ade79a
DIFF: https://github.com/llvm/llvm-project/commit/1825cf28dc83113200b623ebcf063eea35ade79a.diff

LOG: [LoongArch][sanitizer] Fix SC_ADDRERR_{RD,WR} missing in the musl environment (#108557)

Fixes #108550

Added: 
    

Modified: 
    compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

Removed: 
    


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diff  --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
index 16d06c69a38f32..6359f4348e3c48 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;