[llvm] [COFF] Add MIPS relocation types (PR #107814)

[via llvm-commits]

https://github.com/hpoussin created https://github.com/llvm/llvm-project/pull/107814

Add the MIPS COFF relocation types. They will be needed to add support for MIPS Windows object file.

This is an extract of PR https://github.com/llvm/llvm-project/pull/107744.

>From 0e27f6e37c404f1c9378e2ebc8dfda3f5281c19e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Herv=C3=A9=20Poussineau?= <hpoussin at reactos.org>
Date: Sun, 22 Oct 2023 07:30:37 +0200
Subject: [PATCH] [COFF] Add MIPS relocation types

Add the MIPS COFF relocation types. They will be needed to add support for
MIPS Windows object file.
---
 llvm/include/llvm/BinaryFormat/COFF.h | 18 ++++++++++++++++++
 llvm/lib/Object/COFFObjectFile.cpp    | 21 +++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/llvm/include/llvm/BinaryFormat/COFF.h b/llvm/include/llvm/BinaryFormat/COFF.h
index 3fc543f73c49db..bbc5264d17872a 100644
--- a/llvm/include/llvm/BinaryFormat/COFF.h
+++ b/llvm/include/llvm/BinaryFormat/COFF.h
@@ -417,6 +417,24 @@ enum RelocationTypesARM64 : unsigned {
   IMAGE_REL_ARM64_REL32 = 0x0011,
 };
 
+enum RelocationTypesMips : unsigned {
+  IMAGE_REL_MIPS_ABSOLUTE = 0x0000,
+  IMAGE_REL_MIPS_REFHALF = 0x0001,
+  IMAGE_REL_MIPS_REFWORD = 0x0002,
+  IMAGE_REL_MIPS_JMPADDR = 0x0003,
+  IMAGE_REL_MIPS_REFHI = 0x0004,
+  IMAGE_REL_MIPS_REFLO = 0x0005,
+  IMAGE_REL_MIPS_GPREL = 0x0006,
+  IMAGE_REL_MIPS_LITERAL = 0x0007,
+  IMAGE_REL_MIPS_SECTION = 0x000A,
+  IMAGE_REL_MIPS_SECREL = 0x000B,
+  IMAGE_REL_MIPS_SECRELLO = 0x000C,
+  IMAGE_REL_MIPS_SECRELHI = 0x000D,
+  IMAGE_REL_MIPS_JMPADDR16 = 0x0010,
+  IMAGE_REL_MIPS_REFWORDNB = 0x0022,
+  IMAGE_REL_MIPS_PAIR = 0x0025,
+};
+
 enum DynamicRelocationType : unsigned {
   IMAGE_DYNAMIC_RELOCATION_GUARD_RF_PROLOGUE = 1,
   IMAGE_DYNAMIC_RELOCATION_GUARD_RF_EPILOGUE = 2,
diff --git a/llvm/lib/Object/COFFObjectFile.cpp b/llvm/lib/Object/COFFObjectFile.cpp
index 5fdf3baf8c02cc..f55138bb23907a 100644
--- a/llvm/lib/Object/COFFObjectFile.cpp
+++ b/llvm/lib/Object/COFFObjectFile.cpp
@@ -1465,6 +1465,27 @@ StringRef COFFObjectFile::getRelocationTypeName(uint16_t Type) const {
       return "Unknown";
     }
     break;
+  case Triple::mipsel:
+    switch (Type) {
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_ABSOLUTE);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_REFHALF);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_REFWORD);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_JMPADDR);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_REFHI);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_REFLO);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_GPREL);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_LITERAL);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_SECTION);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_SECREL);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_SECRELLO);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_SECRELHI);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_JMPADDR16);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_REFWORDNB);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_MIPS_PAIR);
+    default:
+      return "Unknown";
+    }
+    break;
   default:
     return "Unknown";
   }