[llvm-branch-commits] [compiler-rt] release/19.x: [LoongArch][sanitizer] Fix SC_ADDRERR_{RD, WR} missing in the musl environment (#108557) (PR #109110)

[via llvm-branch-commits]

https://github.com/llvmbot created https://github.com/llvm/llvm-project/pull/109110

Backport 1825cf28dc83113200b623ebcf063eea35ade79a

Requested by: @heiher

>From 4d8867e154dfd99ae6d64de1d97f895c4a44d317 Mon Sep 17 00:00:00 2001
From: hev <wangrui at loongson.cn>
Date: Sat, 14 Sep 2024 11:19:34 +0800
Subject: [PATCH] [LoongArch][sanitizer] Fix SC_ADDRERR_{RD,WR} missing in the
 musl environment (#108557)

Fixes #108550

(cherry picked from commit 1825cf28dc83113200b623ebcf063eea35ade79a)
---
 compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
index 648df0c4e5a760..b9b1f496df7c98 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
@@ -2014,6 +2014,18 @@ 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;