[BinaryFormat][RISCV] Reserve R_RISCV_FUNC_RELATIVE

For non-c18n runtimes this is the same as R_RISCV_RELATIVE, but for c18n
runtimes this marks addresses that must not be wrapped in a trampoline
as they must point directly to the code in question.

Author: jrtc27

llvm/include/llvm/BinaryFormat/ELFRelocs/RISCV.def

@@ -63,7 +63,7 @@ ELF_RELOC(R_RISCV_TLSDESC_CALL,      65)
 ELF_RELOC(R_RISCV_VENDOR,           191)
 // ELF_RELOC(R_RISCV_CUSTOM192,        192)
 // ELF_RELOC(R_RISCV_CUSTOM193,        193)
-ELF_RELOC(R_RISCV_CUSTOM194,        194)
+// ELF_RELOC(R_RISCV_CUSTOM194,        194)
 ELF_RELOC(R_RISCV_CUSTOM195,        195)
 // ELF_RELOC(R_RISCV_CUSTOM196,        196)
 // ELF_RELOC(R_RISCV_CUSTOM197,        197)
@@ -129,7 +129,7 @@ ELF_RELOC(R_RISCV_CUSTOM255,        255)
 // CHERI relocations
 ELF_RELOC(R_RISCV_CHERI_CAPTAB_PCREL_HI20,        192)
 ELF_RELOC(R_RISCV_CHERI_CAPABILITY,               193)
-// 194 reserved
+ELF_RELOC(R_RISCV_FUNC_RELATIVE,                  194)
 // 195 reserved
 ELF_RELOC(R_RISCV_CHERI_TPREL_CINCOFFSET,         196) // Deprecated
 ELF_RELOC(R_RISCV_CHERI_TLS_IE_CAPTAB_PCREL_HI20, 197) // Deprecated

llvm/test/MC/RISCV/xqcili-relocations.s

@@ -28,7 +28,7 @@ qc.li a0, %qc.abs20(undef)
 # ASM: qc.e.li s0, undef
 # OBJ-NEXT: qc.e.li s0, 0x0
 # OBJ-NEXT: R_RISCV_VENDOR QUALCOMM{{$}}
-# OBJ-NEXT: R_RISCV_CUSTOM194 undef{{$}}
+# OBJ-NEXT: R_RISCV_FUNC_RELATIVE undef{{$}}
 qc.e.li s0, undef
 
 
@@ -50,7 +50,7 @@ qc.li a2, %qc.abs20(same_section)
 # ASM: qc.e.li s2, same_section
 # OBJ-NEXT: qc.e.li s2, 0x0
 # OBJ-NEXT: R_RISCV_VENDOR QUALCOMM{{$}}
-# OBJ-NEXT: R_RISCV_CUSTOM194 same_section{{$}}
+# OBJ-NEXT: R_RISCV_FUNC_RELATIVE same_section{{$}}
 qc.e.li s2, same_section
 
 # ASM: qc.li a3, %qc.abs20(other_section)
@@ -62,7 +62,7 @@ qc.li a3, %qc.abs20(other_section)
 # ASM: qc.e.li s3, other_section
 # OBJ-NEXT: qc.e.li s3, 0x0
 # OBJ-NEXT: R_RISCV_VENDOR QUALCOMM{{$}}
-# OBJ-NEXT: R_RISCV_CUSTOM194 other_section{{$}}
+# OBJ-NEXT: R_RISCV_FUNC_RELATIVE other_section{{$}}
 qc.e.li s3, other_section
 
 # ASM-LABEL: same_section:
@@ -93,7 +93,7 @@ qc.li a1, %qc.abs20(undef)
 # ASM: qc.e.li s1, undef
 # OBJ-NEXT: qc.e.li s1, 0x0
 # OBJ-NEXT: R_RISCV_VENDOR QUALCOMM{{$}}
-# OBJ-NEXT: R_RISCV_CUSTOM194 undef{{$}}
+# OBJ-NEXT: R_RISCV_FUNC_RELATIVE undef{{$}}
 # OBJ-NEXT: R_RISCV_RELAX
 qc.e.li s1, undef
 
@@ -110,7 +110,7 @@ qc.li a1, %qc.abs20(undef)
 # ASM: qc.e.li a2, undef
 # OBJ-NEXT: qc.e.li a2, 0x0
 # OBJ-NEXT: R_RISCV_VENDOR QUALCOMM{{$}}
-# OBJ-NEXT: R_RISCV_CUSTOM194 undef{{$}}
+# OBJ-NEXT: R_RISCV_FUNC_RELATIVE undef{{$}}
 # OBJ-NEXT: R_RISCV_RELAX
 qc.e.li a2, undef