# --- T2-COPYRIGHT-BEGIN ---
# t2/package/*/llvm/hotfix-ppc-jit.patch
# Copyright (C) 2025 The T2 SDE Project
# SPDX-License-Identifier: GPL-2.0 or patched project license
# --- T2-COPYRIGHT-END ---

root@g4:~# glxgears
LLVM ERROR: Relocation type 0xa not implemented yet!
Aborted                    (core dumped) glxgears

root@g5:~# glxgears
LLVM ERROR: Relocation type 0x1a not implemented yet!
Aborted                    (core dumped) glxgears

Signed-off-by: Rene Rebe <rene@t2linux.com>

--- llvm-20.1.8.src/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp.orig	2025-07-29 16:55:20.031535540 +0200
+++ llvm-20.1.8.src/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp	2025-07-29 17:29:41.227966195 +0200
@@ -1029,6 +1029,20 @@
   case ELF::R_PPC_ADDR16_HA:
     writeInt16BE(LocalAddress, applyPPCha(Value + Addend));
     break;
+  case ELF::R_PPC_REL24: {
+    uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
+    int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
+    if (SignExtend32<26>(delta) != delta)
+      llvm_unreachable("Relocation R_PPC_REL24 overflow");
+    // We preserve bits other than LI field, i.e. PO and AA/LK fields.
+    uint32_t Inst = readBytesUnaligned(LocalAddress, 4);
+    writeInt32BE(LocalAddress, (Inst & 0xFC000003) | (delta & 0x03FFFFFC));
+  } break;
+  case ELF::R_PPC_REL32: {
+    uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
+    int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
+    writeInt32BE(LocalAddress, delta);
+  } break;
   }
 }