[llvm] 8a5bdd8 - [llvm-jitlink] Fix detectStubKind() for big endian systems (#79970)

[via llvm-commits]

Author: Stefan Gränitz
Date: 2024-01-30T17:00:28+01:00
New Revision: 8a5bdd899f3cb57024d92b96c16e805ca9924ac7

URL: https://github.com/llvm/llvm-project/commit/8a5bdd899f3cb57024d92b96c16e805ca9924ac7
DIFF: https://github.com/llvm/llvm-project/commit/8a5bdd899f3cb57024d92b96c16e805ca9924ac7.diff

LOG: [llvm-jitlink] Fix detectStubKind() for big endian systems (#79970)

This function is used in `jitlink-check` lines in LIT tests. In #78371 I
missed to swap initial instruction bytes for systems that store the
constants as big-endian.

Added: 
    

Modified: 
    llvm/tools/llvm-jitlink/llvm-jitlink.cpp

Removed: 
    


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diff  --git a/llvm/tools/llvm-jitlink/llvm-jitlink.cpp b/llvm/tools/llvm-jitlink/llvm-jitlink.cpp
index b2a133860197d..769ed17ac4cbd 100644
--- a/llvm/tools/llvm-jitlink/llvm-jitlink.cpp
+++ b/llvm/tools/llvm-jitlink/llvm-jitlink.cpp
@@ -1294,10 +1294,11 @@ class MemoryMatcher {
 };
 
 static StringRef detectStubKind(const Session::MemoryRegionInfo &Stub) {
-  constexpr uint32_t Armv7MovWTle = 0xe300c000;
-  constexpr uint32_t Armv7BxR12le = 0xe12fff1c;
-  constexpr uint32_t Thumbv7MovWTle = 0x0c00f240;
-  constexpr uint16_t Thumbv7BxR12le = 0x4760;
+  using namespace support::endian;
+  auto Armv7MovWTle = byte_swap<uint32_t, endianness::little>(0xe300c000);
+  auto Armv7BxR12le = byte_swap<uint32_t, endianness::little>(0xe12fff1c);
+  auto Thumbv7MovWTle = byte_swap<uint32_t, endianness::little>(0x0c00f240);
+  auto Thumbv7BxR12le = byte_swap<uint16_t, endianness::little>(0x4760);
 
   MemoryMatcher M(Stub.getContent());
   if (M.matchMask(Thumbv7MovWTle)) {