reloc.go

Documentation: cmd/link/internal/sym

     1  // Copyright 2017 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package sym
     6  
     7  import (
     8  	"cmd/internal/objabi"
     9  	"cmd/internal/sys"
    10  	"debug/elf"
    11  	"debug/macho"
    12  )
    13  
    14  // RelocVariant is a linker-internal variation on a relocation.
    15  type RelocVariant uint8
    16  
    17  const (
    18  	RV_NONE RelocVariant = iota
    19  	RV_POWER_LO
    20  	RV_POWER_HI
    21  	RV_POWER_HA
    22  	RV_POWER_DS
    23  
    24  	// RV_390_DBL is a s390x-specific relocation variant that indicates that
    25  	// the value to be placed into the relocatable field should first be
    26  	// divided by 2.
    27  	RV_390_DBL
    28  
    29  	RV_CHECK_OVERFLOW RelocVariant = 1 << 7
    30  	RV_TYPE_MASK      RelocVariant = RV_CHECK_OVERFLOW - 1
    31  )
    32  
    33  func RelocName(arch *sys.Arch, r objabi.RelocType) string {
    34  	switch {
    35  	case r >= objabi.MachoRelocOffset: // Mach-O
    36  		nr := (r - objabi.MachoRelocOffset) >> 1
    37  		switch arch.Family {
    38  		case sys.AMD64:
    39  			return macho.RelocTypeX86_64(nr).String()
    40  		case sys.ARM64:
    41  			return macho.RelocTypeARM64(nr).String()
    42  		default:
    43  			panic("unreachable")
    44  		}
    45  	case r >= objabi.ElfRelocOffset: // ELF
    46  		nr := r - objabi.ElfRelocOffset
    47  		switch arch.Family {
    48  		case sys.AMD64:
    49  			return elf.R_X86_64(nr).String()
    50  		case sys.ARM:
    51  			return elf.R_ARM(nr).String()
    52  		case sys.ARM64:
    53  			return elf.R_AARCH64(nr).String()
    54  		case sys.I386:
    55  			return elf.R_386(nr).String()
    56  		case sys.Loong64:
    57  			return elf.R_LARCH(nr).String()
    58  		case sys.MIPS, sys.MIPS64:
    59  			return elf.R_MIPS(nr).String()
    60  		case sys.PPC64:
    61  			return elf.R_PPC64(nr).String()
    62  		case sys.S390X:
    63  			return elf.R_390(nr).String()
    64  		case sys.RISCV64:
    65  			return elf.R_RISCV(nr).String()
    66  		default:
    67  			panic("unreachable")
    68  		}
    69  	}
    70  
    71  	return r.String()
    72  }
    73
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