1 files changed, 76 insertions, 0 deletions
diff --git a/src/cmd/link/internal/sym/reloc.go b/src/cmd/link/internal/sym/reloc.go
new file mode 100644
index 0000000..a44dcdd
--- /dev/null
+++ b/src/cmd/link/internal/sym/reloc.go
@@ -0,0 +1,76 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sym
+
+import (
+	"cmd/internal/objabi"
+	"cmd/internal/sys"
+	"debug/elf"
+)
+
+// RelocVariant is a linker-internal variation on a relocation.
+type RelocVariant uint8
+
+const (
+	RV_NONE RelocVariant = iota
+	RV_POWER_LO
+	RV_POWER_HI
+	RV_POWER_HA
+	RV_POWER_DS
+
+	// RV_390_DBL is a s390x-specific relocation variant that indicates that
+	// the value to be placed into the relocatable field should first be
+	// divided by 2.
+	RV_390_DBL
+
+	RV_CHECK_OVERFLOW RelocVariant = 1 << 7
+	RV_TYPE_MASK      RelocVariant = RV_CHECK_OVERFLOW - 1
+)
+
+func RelocName(arch *sys.Arch, r objabi.RelocType) string {
+	// We didn't have some relocation types at Go1.4.
+	// Uncomment code when we include those in bootstrap code.
+
+	switch {
+	case r >= objabi.MachoRelocOffset: // Mach-O
+		// nr := (r - objabi.MachoRelocOffset)>>1
+		// switch ctxt.Arch.Family {
+		// case sys.AMD64:
+		// 	return macho.RelocTypeX86_64(nr).String()
+		// case sys.ARM:
+		// 	return macho.RelocTypeARM(nr).String()
+		// case sys.ARM64:
+		// 	return macho.RelocTypeARM64(nr).String()
+		// case sys.I386:
+		// 	return macho.RelocTypeGeneric(nr).String()
+		// default:
+		// 	panic("unreachable")
+		// }
+	case r >= objabi.ElfRelocOffset: // ELF
+		nr := r - objabi.ElfRelocOffset
+		switch arch.Family {
+		case sys.AMD64:
+			return elf.R_X86_64(nr).String()
+		case sys.ARM:
+			return elf.R_ARM(nr).String()
+		case sys.ARM64:
+			return elf.R_AARCH64(nr).String()
+		case sys.I386:
+			return elf.R_386(nr).String()
+		case sys.Loong64:
+			return elf.R_LARCH(nr).String()
+		case sys.MIPS, sys.MIPS64:
+			return elf.R_MIPS(nr).String()
+		case sys.PPC64:
+			return elf.R_PPC64(nr).String()
+		case sys.S390X:
+			return elf.R_390(nr).String()
+		default:
+			panic("unreachable")
+		}
+	}
+
+	return r.String()
+}