[LoongArch] Define the LAELF v20230519 relocs

[xen0n]

Summary

The LoongArch ELF psABI document has changed location and versioning
scheme; this revision is v2.10 in the old scheme. Notably this revision
brings initial capability of linker relaxation to LoongArch.

[SixWeining]

LGTM. Thanks for the quick adoption!

llvm/include/llvm/BinaryFormat/ELFRelocs/LoongArch.def

 ELF_RELOC(R_LARCH_TLS_IE64_LO20,    93)
 ELF_RELOC(R_LARCH_TLS_IE64_HI12,    94)
 ELF_RELOC(R_LARCH_TLS_LD_PC_HI20,   95)
 ELF_RELOC(R_LARCH_TLS_LD_HI20,      96)
 ELF_RELOC(R_LARCH_TLS_GD_PC_HI20,   97)
 ELF_RELOC(R_LARCH_TLS_GD_HI20,      98)
 ELF_RELOC(R_LARCH_32_PCREL,         99)
 ELF_RELOC(R_LARCH_RELAX,            100)
+
+// Relocs added in ELF for the LoongArch™ Architecture v20230519, part of the
+// v2.10 LoongArch ABI specs.
+//
+// Spec addition: https://github.com/loongson/la-abi-specs/pull/1
+// Binutils commit 57a930e3bfe4b2c7fd6463ed39311e1938513138
+ELF_RELOC(R_LARCH_DELETE,      101)
+ELF_RELOC(R_LARCH_ALIGN,       102)
+ELF_RELOC(R_LARCH_PCREL20_S2,  103)
+ELF_RELOC(R_LARCH_CFA,         104)
+ELF_RELOC(R_LARCH_ADD6,        105)
+ELF_RELOC(R_LARCH_SUB6,        106)
+ELF_RELOC(R_LARCH_ADD_ULEB128, 107)
+ELF_RELOC(R_LARCH_SUB_ULEB128, 108)
+ELF_RELOC(R_LARCH_64_PCREL,    109)

llvm/test/tools/llvm-readobj/ELF/reloc-types-loongarch64.test

 # CHECK: Type: R_LARCH_TLS_IE64_LO20 (93)
 # CHECK: Type: R_LARCH_TLS_IE64_HI12 (94)
 # CHECK: Type: R_LARCH_TLS_LD_PC_HI20 (95)
 # CHECK: Type: R_LARCH_TLS_LD_HI20 (96)
 # CHECK: Type: R_LARCH_TLS_GD_PC_HI20 (97)
 # CHECK: Type: R_LARCH_TLS_GD_HI20 (98)
 # CHECK: Type: R_LARCH_32_PCREL (99)
 # CHECK: Type: R_LARCH_RELAX (100)
+# CHECK: Type: R_LARCH_DELETE (101)
+# CHECK: Type: R_LARCH_ALIGN (102)
+# CHECK: Type: R_LARCH_PCREL20_S2 (103)
+# CHECK: Type: R_LARCH_CFA (104)
+# CHECK: Type: R_LARCH_ADD6 (105)
+# CHECK: Type: R_LARCH_SUB6 (106)
+# CHECK: Type: R_LARCH_ADD_ULEB128 (107)
+# CHECK: Type: R_LARCH_SUB_ULEB128 (108)
+# CHECK: Type: R_LARCH_64_PCREL (109)
 
 --- !ELF
 FileHeader:
   Class:   ELFCLASS64
   Data:    ELFDATA2LSB
   Type:    ET_REL
   Machine: EM_LOONGARCH
 Sections:
Relocations:
       - Type: R_LARCH_TLS_IE64_LO20
       - Type: R_LARCH_TLS_IE64_HI12
       - Type: R_LARCH_TLS_LD_PC_HI20
       - Type: R_LARCH_TLS_LD_HI20
       - Type: R_LARCH_TLS_GD_PC_HI20
       - Type: R_LARCH_TLS_GD_HI20
       - Type: R_LARCH_32_PCREL
       - Type: R_LARCH_RELAX
+      - Type: R_LARCH_DELETE
+      - Type: R_LARCH_ALIGN
+      - Type: R_LARCH_PCREL20_S2
+      - Type: R_LARCH_CFA
+      - Type: R_LARCH_ADD6
+      - Type: R_LARCH_SUB6
+      - Type: R_LARCH_ADD_ULEB128
+      - Type: R_LARCH_SUB_ULEB128
+      - Type: R_LARCH_64_PCREL

llvm/unittests/Object/ELFTest.cpp

TEST(ELFTest, getELFRelocationTypeNameForLoongArch) {
   EXPECT_EQ("R_LARCH_TLS_GD_PC_HI20",
             getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_TLS_GD_PC_HI20));
   EXPECT_EQ("R_LARCH_TLS_GD_HI20",
             getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_TLS_GD_HI20));
   EXPECT_EQ("R_LARCH_32_PCREL",
             getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_32_PCREL));
   EXPECT_EQ("R_LARCH_RELAX",
             getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_RELAX));
+  EXPECT_EQ("R_LARCH_DELETE",
+            getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_DELETE));
+  EXPECT_EQ("R_LARCH_ALIGN",
+            getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_ALIGN));
+  EXPECT_EQ("R_LARCH_PCREL20_S2",
+            getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_PCREL20_S2));
+  EXPECT_EQ("R_LARCH_CFA",
+            getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_CFA));
+  EXPECT_EQ("R_LARCH_ADD6",
+            getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_ADD6));
+  EXPECT_EQ("R_LARCH_SUB6",
+            getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_SUB6));
+  EXPECT_EQ("R_LARCH_ADD_ULEB128",
+            getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_ADD_ULEB128));
+  EXPECT_EQ("R_LARCH_SUB_ULEB128",
+            getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_SUB_ULEB128));
+  EXPECT_EQ("R_LARCH_64_PCREL",
+            getELFRelocationTypeName(EM_LOONGARCH, R_LARCH_64_PCREL));
 }
 
 TEST(ELFTest, getELFRelativeRelocationType) {
   EXPECT_EQ(ELF::R_VE_RELATIVE, getELFRelativeRelocationType(EM_VE));
   EXPECT_EQ(ELF::R_LARCH_RELATIVE, getELFRelativeRelocationType(EM_LOONGARCH));
 }
 
 // This is a test for the DataRegion helper struct, defined in ELF.h header.