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The howto manager

When an application wants to create a relocation, but doesn't know what the target machine might call it, it can find out by using this bit of code.

bfd_reloc_code_type

Description
The insides of a reloc code. The idea is that, eventually, there will be one enumerator for every type of relocation we ever do. Pass one of these values to bfd_reloc_type_lookup, and it'll return a howto pointer.

This does mean that the application must determine the correct enumerator value; you can't get a howto pointer from a random set of attributes.

Here are the possible values for enum bfd_reloc_code_real:

BFD_RELOC_64
BFD_RELOC_32
BFD_RELOC_26
BFD_RELOC_24
BFD_RELOC_16
BFD_RELOC_14
BFD_RELOC_8
Basic absolute relocations of N bits.

BFD_RELOC_64_PCREL
BFD_RELOC_32_PCREL
BFD_RELOC_24_PCREL
BFD_RELOC_16_PCREL
BFD_RELOC_12_PCREL
BFD_RELOC_8_PCREL
PC-relative relocations. Sometimes these are relative to the address of the relocation itself; sometimes they are relative to the start of the section containing the relocation. It depends on the specific target.

The 24-bit relocation is used in some Intel 960 configurations.

BFD_RELOC_32_GOT_PCREL
BFD_RELOC_16_GOT_PCREL
BFD_RELOC_8_GOT_PCREL
BFD_RELOC_32_GOTOFF
BFD_RELOC_16_GOTOFF
BFD_RELOC_LO16_GOTOFF
BFD_RELOC_HI16_GOTOFF
BFD_RELOC_HI16_S_GOTOFF
BFD_RELOC_8_GOTOFF
BFD_RELOC_64_PLT_PCREL
BFD_RELOC_32_PLT_PCREL
BFD_RELOC_24_PLT_PCREL
BFD_RELOC_16_PLT_PCREL
BFD_RELOC_8_PLT_PCREL
BFD_RELOC_64_PLTOFF
BFD_RELOC_32_PLTOFF
BFD_RELOC_16_PLTOFF
BFD_RELOC_LO16_PLTOFF
BFD_RELOC_HI16_PLTOFF
BFD_RELOC_HI16_S_PLTOFF
BFD_RELOC_8_PLTOFF
For ELF.

BFD_RELOC_68K_GLOB_DAT
BFD_RELOC_68K_JMP_SLOT
BFD_RELOC_68K_RELATIVE
Relocations used by 68K ELF.

BFD_RELOC_32_BASEREL
BFD_RELOC_16_BASEREL
BFD_RELOC_LO16_BASEREL
BFD_RELOC_HI16_BASEREL
BFD_RELOC_HI16_S_BASEREL
BFD_RELOC_8_BASEREL
BFD_RELOC_RVA
Linkage-table relative.

BFD_RELOC_8_FFnn
Absolute 8-bit relocation, but used to form an address like 0xFFnn.

BFD_RELOC_32_PCREL_S2
BFD_RELOC_16_PCREL_S2
BFD_RELOC_23_PCREL_S2
These PC-relative relocations are stored as word displacements - i.e., byte displacements shifted right two bits. The 30-bit word displacement (<<32_PCREL_S2>> - 32 bits, shifted 2) is used on the SPARC. (SPARC tools generally refer to this as <<WDISP30>>.) The signed 16-bit displacement is used on the MIPS, and the 23-bit displacement is used on the Alpha.

BFD_RELOC_HI22
BFD_RELOC_LO10
High 22 bits and low 10 bits of 32-bit value, placed into lower bits of the target word. These are used on the SPARC.

BFD_RELOC_GPREL16
BFD_RELOC_GPREL32
For systems that allocate a Global Pointer register, these are displacements off that register. These relocation types are handled specially, because the value the register will have is decided relatively late.

BFD_RELOC_I960_CALLJ
Reloc types used for i960/b.out.

BFD_RELOC_NONE
BFD_RELOC_SPARC_WDISP22
BFD_RELOC_SPARC22
BFD_RELOC_SPARC13
BFD_RELOC_SPARC_GOT10
BFD_RELOC_SPARC_GOT13
BFD_RELOC_SPARC_GOT22
BFD_RELOC_SPARC_PC10
BFD_RELOC_SPARC_PC22
BFD_RELOC_SPARC_WPLT30
BFD_RELOC_SPARC_COPY
BFD_RELOC_SPARC_GLOB_DAT
BFD_RELOC_SPARC_JMP_SLOT
BFD_RELOC_SPARC_RELATIVE
BFD_RELOC_SPARC_UA16
BFD_RELOC_SPARC_UA32
BFD_RELOC_SPARC_UA64
SPARC ELF relocations. There is probably some overlap with other relocation types already defined.

BFD_RELOC_SPARC_BASE13
BFD_RELOC_SPARC_BASE22
I think these are specific to SPARC a.out (e.g., Sun 4).

BFD_RELOC_SPARC_64
BFD_RELOC_SPARC_10
BFD_RELOC_SPARC_11
BFD_RELOC_SPARC_OLO10
BFD_RELOC_SPARC_HH22
BFD_RELOC_SPARC_HM10
BFD_RELOC_SPARC_LM22
BFD_RELOC_SPARC_PC_HH22
BFD_RELOC_SPARC_PC_HM10
BFD_RELOC_SPARC_PC_LM22
BFD_RELOC_SPARC_WDISP16
BFD_RELOC_SPARC_WDISP19
BFD_RELOC_SPARC_7
BFD_RELOC_SPARC_6
BFD_RELOC_SPARC_5
BFD_RELOC_SPARC_DISP64
BFD_RELOC_SPARC_PLT32
BFD_RELOC_SPARC_PLT64
BFD_RELOC_SPARC_HIX22
BFD_RELOC_SPARC_LOX10
BFD_RELOC_SPARC_H44
BFD_RELOC_SPARC_M44
BFD_RELOC_SPARC_L44
BFD_RELOC_SPARC_REGISTER
SPARC64 relocations

BFD_RELOC_SPARC_REV32
SPARC little endian relocation

BFD_RELOC_ALPHA_GPDISP_HI16
Alpha ECOFF and ELF relocations. Some of these treat the symbol or "addend" in some special way. For GPDISP_HI16 ("gpdisp") relocations, the symbol is ignored when writing; when reading, it will be the absolute section symbol. The addend is the displacement in bytes of the "lda" instruction from the "ldah" instruction (which is at the address of this reloc).

BFD_RELOC_ALPHA_GPDISP_LO16
For GPDISP_LO16 ("ignore") relocations, the symbol is handled as with GPDISP_HI16 relocs. The addend is ignored when writing the relocations out, and is filled in with the file's GP value on reading, for convenience.

BFD_RELOC_ALPHA_GPDISP
The ELF GPDISP relocation is exactly the same as the GPDISP_HI16 relocation except that there is no accompanying GPDISP_LO16 relocation.

BFD_RELOC_ALPHA_LITERAL
BFD_RELOC_ALPHA_ELF_LITERAL
BFD_RELOC_ALPHA_LITUSE
The Alpha LITERAL/LITUSE relocs are produced by a symbol reference; the assembler turns it into a LDQ instruction to load the address of the symbol, and then fills in a register in the real instruction.

The LITERAL reloc, at the LDQ instruction, refers to the .lita section symbol. The addend is ignored when writing, but is filled in with the file's GP value on reading, for convenience, as with the GPDISP_LO16 reloc.

The ELF_LITERAL reloc is somewhere between 16_GOTOFF and GPDISP_LO16. It should refer to the symbol to be referenced, as with 16_GOTOFF, but it generates output not based on the position within the .got section, but relative to the GP value chosen for the file during the final link stage.

The LITUSE reloc, on the instruction using the loaded address, gives information to the linker that it might be able to use to optimize away some literal section references. The symbol is ignored (read as the absolute section symbol), and the "addend" indicates the type of instruction using the register: 1 - "memory" fmt insn 2 - byte-manipulation (byte offset reg) 3 - jsr (target of branch)

BFD_RELOC_ALPHA_HINT
The HINT relocation indicates a value that should be filled into the "hint" field of a jmp/jsr/ret instruction, for possible branch- prediction logic which may be provided on some processors.

BFD_RELOC_ALPHA_LINKAGE
The LINKAGE relocation outputs a linkage pair in the object file, which is filled by the linker.

BFD_RELOC_ALPHA_CODEADDR
The CODEADDR relocation outputs a STO_CA in the object file, which is filled by the linker.

BFD_RELOC_ALPHA_GPREL_HI16
BFD_RELOC_ALPHA_GPREL_LO16
The GPREL_HI/LO relocations together form a 32-bit offset from the GP register.

BFD_RELOC_ALPHA_BRSGP
Like BFD_RELOC_23_PCREL_S2, except that the source and target must share a common GP, and the target address is adjusted for STO_ALPHA_STD_GPLOAD.

BFD_RELOC_MIPS_JMP
Bits 27..2 of the relocation address shifted right 2 bits; simple reloc otherwise.

BFD_RELOC_MIPS16_JMP
The MIPS16 jump instruction.

BFD_RELOC_MIPS16_GPREL
MIPS16 GP relative reloc.

BFD_RELOC_HI16
High 16 bits of 32-bit value; simple reloc.

BFD_RELOC_HI16_S
High 16 bits of 32-bit value but the low 16 bits will be sign extended and added to form the final result. If the low 16 bits form a negative number, we need to add one to the high value to compensate for the borrow when the low bits are added.

BFD_RELOC_LO16
Low 16 bits.

BFD_RELOC_PCREL_HI16_S
Like BFD_RELOC_HI16_S, but PC relative.

BFD_RELOC_PCREL_LO16
Like BFD_RELOC_LO16, but PC relative.

BFD_RELOC_MIPS_LITERAL
Relocation against a MIPS literal section.

BFD_RELOC_MIPS_GOT16
BFD_RELOC_MIPS_CALL16
BFD_RELOC_MIPS_GOT_HI16
BFD_RELOC_MIPS_GOT_LO16
BFD_RELOC_MIPS_CALL_HI16
BFD_RELOC_MIPS_CALL_LO16
BFD_RELOC_MIPS_SUB
BFD_RELOC_MIPS_GOT_PAGE
BFD_RELOC_MIPS_GOT_OFST
BFD_RELOC_MIPS_GOT_DISP
BFD_RELOC_MIPS_SHIFT5
BFD_RELOC_MIPS_SHIFT6
BFD_RELOC_MIPS_INSERT_A
BFD_RELOC_MIPS_INSERT_B
BFD_RELOC_MIPS_DELETE
BFD_RELOC_MIPS_HIGHEST
BFD_RELOC_MIPS_HIGHER
BFD_RELOC_MIPS_SCN_DISP
BFD_RELOC_MIPS_REL16
BFD_RELOC_MIPS_RELGOT
BFD_RELOC_MIPS_JALR
BFD_RELOC_SH_GOT_LOW16
BFD_RELOC_SH_GOT_MEDLOW16
BFD_RELOC_SH_GOT_MEDHI16
BFD_RELOC_SH_GOT_HI16
BFD_RELOC_SH_GOTPLT_LOW16
BFD_RELOC_SH_GOTPLT_MEDLOW16
BFD_RELOC_SH_GOTPLT_MEDHI16
BFD_RELOC_SH_GOTPLT_HI16
BFD_RELOC_SH_PLT_LOW16
BFD_RELOC_SH_PLT_MEDLOW16
BFD_RELOC_SH_PLT_MEDHI16
BFD_RELOC_SH_PLT_HI16
BFD_RELOC_SH_GOTOFF_LOW16
BFD_RELOC_SH_GOTOFF_MEDLOW16
BFD_RELOC_SH_GOTOFF_MEDHI16
BFD_RELOC_SH_GOTOFF_HI16
BFD_RELOC_SH_GOTPC_LOW16
BFD_RELOC_SH_GOTPC_MEDLOW16
BFD_RELOC_SH_GOTPC_MEDHI16
BFD_RELOC_SH_GOTPC_HI16
BFD_RELOC_SH_COPY64
BFD_RELOC_SH_GLOB_DAT64
BFD_RELOC_SH_JMP_SLOT64
BFD_RELOC_SH_RELATIVE64
BFD_RELOC_SH_GOT10BY4
BFD_RELOC_SH_GOT10BY8
BFD_RELOC_SH_GOTPLT10BY4
BFD_RELOC_SH_GOTPLT10BY8
BFD_RELOC_SH_GOTPLT32
BFD_RELOC_SH_SHMEDIA_CODE
BFD_RELOC_SH_IMMU5
BFD_RELOC_SH_IMMS6
BFD_RELOC_SH_IMMS6BY32
BFD_RELOC_SH_IMMU6
BFD_RELOC_SH_IMMS10
BFD_RELOC_SH_IMMS10BY2
BFD_RELOC_SH_IMMS10BY4
BFD_RELOC_SH_IMMS10BY8
BFD_RELOC_SH_IMMS16
BFD_RELOC_SH_IMMU16
BFD_RELOC_SH_IMM_LOW16
BFD_RELOC_SH_IMM_LOW16_PCREL
BFD_RELOC_SH_IMM_MEDLOW16
BFD_RELOC_SH_IMM_MEDLOW16_PCREL
BFD_RELOC_SH_IMM_MEDHI16
BFD_RELOC_SH_IMM_MEDHI16_PCREL
BFD_RELOC_SH_IMM_HI16
BFD_RELOC_SH_IMM_HI16_PCREL
BFD_RELOC_SH_PT_16
MIPS ELF relocations.

BFD_RELOC_386_GOT32
BFD_RELOC_386_PLT32
BFD_RELOC_386_COPY
BFD_RELOC_386_GLOB_DAT
BFD_RELOC_386_JUMP_SLOT
BFD_RELOC_386_RELATIVE
BFD_RELOC_386_GOTOFF
BFD_RELOC_386_GOTPC
i386/elf relocations

BFD_RELOC_X86_64_GOT32
BFD_RELOC_X86_64_PLT32
BFD_RELOC_X86_64_COPY
BFD_RELOC_X86_64_GLOB_DAT
BFD_RELOC_X86_64_JUMP_SLOT
BFD_RELOC_X86_64_RELATIVE
BFD_RELOC_X86_64_GOTPCREL
BFD_RELOC_X86_64_32S
x86-64/elf relocations

BFD_RELOC_NS32K_IMM_8
BFD_RELOC_NS32K_IMM_16
BFD_RELOC_NS32K_IMM_32
BFD_RELOC_NS32K_IMM_8_PCREL
BFD_RELOC_NS32K_IMM_16_PCREL
BFD_RELOC_NS32K_IMM_32_PCREL
BFD_RELOC_NS32K_DISP_8
BFD_RELOC_NS32K_DISP_16
BFD_RELOC_NS32K_DISP_32
BFD_RELOC_NS32K_DISP_8_PCREL
BFD_RELOC_NS32K_DISP_16_PCREL
BFD_RELOC_NS32K_DISP_32_PCREL
ns32k relocations

BFD_RELOC_PDP11_DISP_8_PCREL
BFD_RELOC_PDP11_DISP_6_PCREL
PDP11 relocations

BFD_RELOC_PJ_CODE_HI16
BFD_RELOC_PJ_CODE_LO16
BFD_RELOC_PJ_CODE_DIR16
BFD_RELOC_PJ_CODE_DIR32
BFD_RELOC_PJ_CODE_REL16
BFD_RELOC_PJ_CODE_REL32
Picojava relocs. Not all of these appear in object files.

BFD_RELOC_PPC_B26
BFD_RELOC_PPC_BA26
BFD_RELOC_PPC_TOC16
BFD_RELOC_PPC_B16
BFD_RELOC_PPC_B16_BRTAKEN
BFD_RELOC_PPC_B16_BRNTAKEN
BFD_RELOC_PPC_BA16
BFD_RELOC_PPC_BA16_BRTAKEN
BFD_RELOC_PPC_BA16_BRNTAKEN
BFD_RELOC_PPC_COPY
BFD_RELOC_PPC_GLOB_DAT
BFD_RELOC_PPC_JMP_SLOT
BFD_RELOC_PPC_RELATIVE
BFD_RELOC_PPC_LOCAL24PC
BFD_RELOC_PPC_EMB_NADDR32
BFD_RELOC_PPC_EMB_NADDR16
BFD_RELOC_PPC_EMB_NADDR16_LO
BFD_RELOC_PPC_EMB_NADDR16_HI
BFD_RELOC_PPC_EMB_NADDR16_HA
BFD_RELOC_PPC_EMB_SDAI16
BFD_RELOC_PPC_EMB_SDA2I16
BFD_RELOC_PPC_EMB_SDA2REL
BFD_RELOC_PPC_EMB_SDA21
BFD_RELOC_PPC_EMB_MRKREF
BFD_RELOC_PPC_EMB_RELSEC16
BFD_RELOC_PPC_EMB_RELST_LO
BFD_RELOC_PPC_EMB_RELST_HI
BFD_RELOC_PPC_EMB_RELST_HA
BFD_RELOC_PPC_EMB_BIT_FLD
BFD_RELOC_PPC_EMB_RELSDA
BFD_RELOC_PPC64_HIGHER
BFD_RELOC_PPC64_HIGHER_S
BFD_RELOC_PPC64_HIGHEST
BFD_RELOC_PPC64_HIGHEST_S
BFD_RELOC_PPC64_TOC16_LO
BFD_RELOC_PPC64_TOC16_HI
BFD_RELOC_PPC64_TOC16_HA
BFD_RELOC_PPC64_TOC
BFD_RELOC_PPC64_PLTGOT16
BFD_RELOC_PPC64_PLTGOT16_LO
BFD_RELOC_PPC64_PLTGOT16_HI
BFD_RELOC_PPC64_PLTGOT16_HA
BFD_RELOC_PPC64_ADDR16_DS
BFD_RELOC_PPC64_ADDR16_LO_DS
BFD_RELOC_PPC64_GOT16_DS
BFD_RELOC_PPC64_GOT16_LO_DS
BFD_RELOC_PPC64_PLT16_LO_DS
BFD_RELOC_PPC64_SECTOFF_DS
BFD_RELOC_PPC64_SECTOFF_LO_DS
BFD_RELOC_PPC64_TOC16_DS
BFD_RELOC_PPC64_TOC16_LO_DS
BFD_RELOC_PPC64_PLTGOT16_DS
BFD_RELOC_PPC64_PLTGOT16_LO_DS
Power(rs6000) and PowerPC relocations.

BFD_RELOC_I370_D12
IBM 370/390 relocations

BFD_RELOC_CTOR
The type of reloc used to build a contructor table - at the moment probably a 32 bit wide absolute relocation, but the target can choose. It generally does map to one of the other relocation types.

BFD_RELOC_ARM_PCREL_BRANCH
ARM 26 bit pc-relative branch. The lowest two bits must be zero and are not stored in the instruction.

BFD_RELOC_ARM_PCREL_BLX
ARM 26 bit pc-relative branch. The lowest bit must be zero and is not stored in the instruction. The 2nd lowest bit comes from a 1 bit field in the instruction.

BFD_RELOC_THUMB_PCREL_BLX
Thumb 22 bit pc-relative branch. The lowest bit must be zero and is not stored in the instruction. The 2nd lowest bit comes from a 1 bit field in the instruction.

BFD_RELOC_ARM_IMMEDIATE
BFD_RELOC_ARM_ADRL_IMMEDIATE
BFD_RELOC_ARM_OFFSET_IMM
BFD_RELOC_ARM_SHIFT_IMM
BFD_RELOC_ARM_SWI
BFD_RELOC_ARM_MULTI
BFD_RELOC_ARM_CP_OFF_IMM
BFD_RELOC_ARM_ADR_IMM
BFD_RELOC_ARM_LDR_IMM
BFD_RELOC_ARM_LITERAL
BFD_RELOC_ARM_IN_POOL
BFD_RELOC_ARM_OFFSET_IMM8
BFD_RELOC_ARM_HWLITERAL
BFD_RELOC_ARM_THUMB_ADD
BFD_RELOC_ARM_THUMB_IMM
BFD_RELOC_ARM_THUMB_SHIFT
BFD_RELOC_ARM_THUMB_OFFSET
BFD_RELOC_ARM_GOT12
BFD_RELOC_ARM_GOT32
BFD_RELOC_ARM_JUMP_SLOT
BFD_RELOC_ARM_COPY
BFD_RELOC_ARM_GLOB_DAT
BFD_RELOC_ARM_PLT32
BFD_RELOC_ARM_RELATIVE
BFD_RELOC_ARM_GOTOFF
BFD_RELOC_ARM_GOTPC
These relocs are only used within the ARM assembler. They are not (at present) written to any object files.

BFD_RELOC_SH_PCDISP8BY2
BFD_RELOC_SH_PCDISP12BY2
BFD_RELOC_SH_IMM4
BFD_RELOC_SH_IMM4BY2
BFD_RELOC_SH_IMM4BY4
BFD_RELOC_SH_IMM8
BFD_RELOC_SH_IMM8BY2
BFD_RELOC_SH_IMM8BY4
BFD_RELOC_SH_PCRELIMM8BY2
BFD_RELOC_SH_PCRELIMM8BY4
BFD_RELOC_SH_SWITCH16
BFD_RELOC_SH_SWITCH32
BFD_RELOC_SH_USES
BFD_RELOC_SH_COUNT
BFD_RELOC_SH_ALIGN
BFD_RELOC_SH_CODE
BFD_RELOC_SH_DATA
BFD_RELOC_SH_LABEL
BFD_RELOC_SH_LOOP_START
BFD_RELOC_SH_LOOP_END
BFD_RELOC_SH_COPY
BFD_RELOC_SH_GLOB_DAT
BFD_RELOC_SH_JMP_SLOT
BFD_RELOC_SH_RELATIVE
BFD_RELOC_SH_GOTPC
Hitachi SH relocs. Not all of these appear in object files.

BFD_RELOC_THUMB_PCREL_BRANCH9
BFD_RELOC_THUMB_PCREL_BRANCH12
BFD_RELOC_THUMB_PCREL_BRANCH23
Thumb 23-, 12- and 9-bit pc-relative branches. The lowest bit must be zero and is not stored in the instruction.

BFD_RELOC_ARC_B22_PCREL
ARC Cores relocs. ARC 22 bit pc-relative branch. The lowest two bits must be zero and are not stored in the instruction. The high 20 bits are installed in bits 26 through 7 of the instruction.

BFD_RELOC_ARC_B26
ARC 26 bit absolute branch. The lowest two bits must be zero and are not stored in the instruction. The high 24 bits are installed in bits 23 through 0.

BFD_RELOC_D10V_10_PCREL_R
Mitsubishi D10V relocs. This is a 10-bit reloc with the right 2 bits assumed to be 0.

BFD_RELOC_D10V_10_PCREL_L
Mitsubishi D10V relocs. This is a 10-bit reloc with the right 2 bits assumed to be 0. This is the same as the previous reloc except it is in the left container, i.e., shifted left 15 bits.

BFD_RELOC_D10V_18
This is an 18-bit reloc with the right 2 bits assumed to be 0.

BFD_RELOC_D10V_18_PCREL
This is an 18-bit reloc with the right 2 bits assumed to be 0.

BFD_RELOC_D30V_6
Mitsubishi D30V relocs. This is a 6-bit absolute reloc.

BFD_RELOC_D30V_9_PCREL
This is a 6-bit pc-relative reloc with the right 3 bits assumed to be 0.

BFD_RELOC_D30V_9_PCREL_R
This is a 6-bit pc-relative reloc with the right 3 bits assumed to be 0. Same as the previous reloc but on the right side of the container.

BFD_RELOC_D30V_15
This is a 12-bit absolute reloc with the right 3 bitsassumed to be 0.

BFD_RELOC_D30V_15_PCREL
This is a 12-bit pc-relative reloc with the right 3 bits assumed to be 0.

BFD_RELOC_D30V_15_PCREL_R
This is a 12-bit pc-relative reloc with the right 3 bits assumed to be 0. Same as the previous reloc but on the right side of the container.

BFD_RELOC_D30V_21
This is an 18-bit absolute reloc with the right 3 bits assumed to be 0.

BFD_RELOC_D30V_21_PCREL
This is an 18-bit pc-relative reloc with the right 3 bits assumed to be 0.

BFD_RELOC_D30V_21_PCREL_R
This is an 18-bit pc-relative reloc with the right 3 bits assumed to be 0. Same as the previous reloc but on the right side of the container.

BFD_RELOC_D30V_32
This is a 32-bit absolute reloc.

BFD_RELOC_D30V_32_PCREL
This is a 32-bit pc-relative reloc.

BFD_RELOC_M32R_24
Mitsubishi M32R relocs. This is a 24 bit absolute address.

BFD_RELOC_M32R_10_PCREL
This is a 10-bit pc-relative reloc with the right 2 bits assumed to be 0.

BFD_RELOC_M32R_18_PCREL
This is an 18-bit reloc with the right 2 bits assumed to be 0.

BFD_RELOC_M32R_26_PCREL
This is a 26-bit reloc with the right 2 bits assumed to be 0.

BFD_RELOC_M32R_HI16_ULO
This is a 16-bit reloc containing the high 16 bits of an address used when the lower 16 bits are treated as unsigned.

BFD_RELOC_M32R_HI16_SLO
This is a 16-bit reloc containing the high 16 bits of an address used when the lower 16 bits are treated as signed.

BFD_RELOC_M32R_LO16
This is a 16-bit reloc containing the lower 16 bits of an address.

BFD_RELOC_M32R_SDA16
This is a 16-bit reloc containing the small data area offset for use in add3, load, and store instructions.

BFD_RELOC_V850_9_PCREL
This is a 9-bit reloc

BFD_RELOC_V850_22_PCREL
This is a 22-bit reloc

BFD_RELOC_V850_SDA_16_16_OFFSET
This is a 16 bit offset from the short data area pointer.

BFD_RELOC_V850_SDA_15_16_OFFSET
This is a 16 bit offset (of which only 15 bits are used) from the short data area pointer.

BFD_RELOC_V850_ZDA_16_16_OFFSET
This is a 16 bit offset from the zero data area pointer.

BFD_RELOC_V850_ZDA_15_16_OFFSET
This is a 16 bit offset (of which only 15 bits are used) from the zero data area pointer.

BFD_RELOC_V850_TDA_6_8_OFFSET
This is an 8 bit offset (of which only 6 bits are used) from the tiny data area pointer.

BFD_RELOC_V850_TDA_7_8_OFFSET
This is an 8bit offset (of which only 7 bits are used) from the tiny data area pointer.

BFD_RELOC_V850_TDA_7_7_OFFSET
This is a 7 bit offset from the tiny data area pointer.

BFD_RELOC_V850_TDA_16_16_OFFSET
This is a 16 bit offset from the tiny data area pointer.

BFD_RELOC_V850_TDA_4_5_OFFSET
This is a 5 bit offset (of which only 4 bits are used) from the tiny data area pointer.

BFD_RELOC_V850_TDA_4_4_OFFSET
This is a 4 bit offset from the tiny data area pointer.

BFD_RELOC_V850_SDA_16_16_SPLIT_OFFSET
This is a 16 bit offset from the short data area pointer, with the bits placed non-contigously in the instruction.

BFD_RELOC_V850_ZDA_16_16_SPLIT_OFFSET
This is a 16 bit offset from the zero data area pointer, with the bits placed non-contigously in the instruction.

BFD_RELOC_V850_CALLT_6_7_OFFSET
This is a 6 bit offset from the call table base pointer.

BFD_RELOC_V850_CALLT_16_16_OFFSET
This is a 16 bit offset from the call table base pointer.

BFD_RELOC_MN10300_32_PCREL
This is a 32bit pcrel reloc for the mn10300, offset by two bytes in the instruction.

BFD_RELOC_MN10300_16_PCREL
This is a 16bit pcrel reloc for the mn10300, offset by two bytes in the instruction.

BFD_RELOC_TIC30_LDP
This is a 8bit DP reloc for the tms320c30, where the most significant 8 bits of a 24 bit word are placed into the least significant 8 bits of the opcode.

BFD_RELOC_TIC54X_PARTLS7
This is a 7bit reloc for the tms320c54x, where the least significant 7 bits of a 16 bit word are placed into the least significant 7 bits of the opcode.

BFD_RELOC_TIC54X_PARTMS9
This is a 9bit DP reloc for the tms320c54x, where the most significant 9 bits of a 16 bit word are placed into the least significant 9 bits of the opcode.

BFD_RELOC_TIC54X_23
This is an extended address 23-bit reloc for the tms320c54x.

BFD_RELOC_TIC54X_16_OF_23
This is a 16-bit reloc for the tms320c54x, where the least significant 16 bits of a 23-bit extended address are placed into the opcode.

BFD_RELOC_TIC54X_MS7_OF_23
This is a reloc for the tms320c54x, where the most significant 7 bits of a 23-bit extended address are placed into the opcode.

BFD_RELOC_FR30_48
This is a 48 bit reloc for the FR30 that stores 32 bits.

BFD_RELOC_FR30_20
This is a 32 bit reloc for the FR30 that stores 20 bits split up into two sections.

BFD_RELOC_FR30_6_IN_4
This is a 16 bit reloc for the FR30 that stores a 6 bit word offset in 4 bits.

BFD_RELOC_FR30_8_IN_8
This is a 16 bit reloc for the FR30 that stores an 8 bit byte offset into 8 bits.

BFD_RELOC_FR30_9_IN_8
This is a 16 bit reloc for the FR30 that stores a 9 bit short offset into 8 bits.

BFD_RELOC_FR30_10_IN_8
This is a 16 bit reloc for the FR30 that stores a 10 bit word offset into 8 bits.

BFD_RELOC_FR30_9_PCREL
This is a 16 bit reloc for the FR30 that stores a 9 bit pc relative short offset into 8 bits.

BFD_RELOC_FR30_12_PCREL
This is a 16 bit reloc for the FR30 that stores a 12 bit pc relative short offset into 11 bits.

BFD_RELOC_MCORE_PCREL_IMM8BY4
BFD_RELOC_MCORE_PCREL_IMM11BY2
BFD_RELOC_MCORE_PCREL_IMM4BY2
BFD_RELOC_MCORE_PCREL_32
BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2
BFD_RELOC_MCORE_RVA
Motorola Mcore relocations.

BFD_RELOC_MMIX_GETA
BFD_RELOC_MMIX_GETA_1
BFD_RELOC_MMIX_GETA_2
BFD_RELOC_MMIX_GETA_3
These are relocations for the GETA instruction.

BFD_RELOC_MMIX_CBRANCH
BFD_RELOC_MMIX_CBRANCH_J
BFD_RELOC_MMIX_CBRANCH_1
BFD_RELOC_MMIX_CBRANCH_2
BFD_RELOC_MMIX_CBRANCH_3
These are relocations for a conditional branch instruction.

BFD_RELOC_MMIX_PUSHJ
BFD_RELOC_MMIX_PUSHJ_1
BFD_RELOC_MMIX_PUSHJ_2
BFD_RELOC_MMIX_PUSHJ_3
These are relocations for the PUSHJ instruction.

BFD_RELOC_MMIX_JMP
BFD_RELOC_MMIX_JMP_1
BFD_RELOC_MMIX_JMP_2
BFD_RELOC_MMIX_JMP_3
These are relocations for the JMP instruction.

BFD_RELOC_MMIX_ADDR19
This is a relocation for a relative address as in a GETA instruction or a branch.

BFD_RELOC_MMIX_ADDR27
This is a relocation for a relative address as in a JMP instruction.

BFD_RELOC_MMIX_REG_OR_BYTE
This is a relocation for an instruction field that may be a general register or a value 0..255.

BFD_RELOC_MMIX_REG
This is a relocation for an instruction field that may be a general register.

BFD_RELOC_MMIX_BASE_PLUS_OFFSET
This is a relocation for two instruction fields holding a register and an offset, the equivalent of the relocation.

BFD_RELOC_MMIX_LOCAL
This relocation is an assertion that the expression is not allocated as a global register. It does not modify contents.

BFD_RELOC_AVR_7_PCREL
This is a 16 bit reloc for the AVR that stores 8 bit pc relative short offset into 7 bits.

BFD_RELOC_AVR_13_PCREL
This is a 16 bit reloc for the AVR that stores 13 bit pc relative short offset into 12 bits.

BFD_RELOC_AVR_16_PM
This is a 16 bit reloc for the AVR that stores 17 bit value (usually program memory address) into 16 bits.

BFD_RELOC_AVR_LO8_LDI
This is a 16 bit reloc for the AVR that stores 8 bit value (usually data memory address) into 8 bit immediate value of LDI insn.

BFD_RELOC_AVR_HI8_LDI
This is a 16 bit reloc for the AVR that stores 8 bit value (high 8 bit of data memory address) into 8 bit immediate value of LDI insn.

BFD_RELOC_AVR_HH8_LDI
This is a 16 bit reloc for the AVR that stores 8 bit value (most high 8 bit of program memory address) into 8 bit immediate value of LDI insn.

BFD_RELOC_AVR_LO8_LDI_NEG
This is a 16 bit reloc for the AVR that stores negated 8 bit value (usually data memory address) into 8 bit immediate value of SUBI insn.

BFD_RELOC_AVR_HI8_LDI_NEG
This is a 16 bit reloc for the AVR that stores negated 8 bit value (high 8 bit of data memory address) into 8 bit immediate value of SUBI insn.

BFD_RELOC_AVR_HH8_LDI_NEG
This is a 16 bit reloc for the AVR that stores negated 8 bit value (most high 8 bit of program memory address) into 8 bit immediate value of LDI or SUBI insn.

BFD_RELOC_AVR_LO8_LDI_PM
This is a 16 bit reloc for the AVR that stores 8 bit value (usually command address) into 8 bit immediate value of LDI insn.

BFD_RELOC_AVR_HI8_LDI_PM
This is a 16 bit reloc for the AVR that stores 8 bit value (high 8 bit of command address) into 8 bit immediate value of LDI insn.

BFD_RELOC_AVR_HH8_LDI_PM
This is a 16 bit reloc for the AVR that stores 8 bit value (most high 8 bit of command address) into 8 bit immediate value of LDI insn.

BFD_RELOC_AVR_LO8_LDI_PM_NEG
This is a 16 bit reloc for the AVR that stores negated 8 bit value (usually command address) into 8 bit immediate value of SUBI insn.

BFD_RELOC_AVR_HI8_LDI_PM_NEG
This is a 16 bit reloc for the AVR that stores negated 8 bit value (high 8 bit of 16 bit command address) into 8 bit immediate value of SUBI insn.

BFD_RELOC_AVR_HH8_LDI_PM_NEG
This is a 16 bit reloc for the AVR that stores negated 8 bit value (high 6 bit of 22 bit command address) into 8 bit immediate value of SUBI insn.

BFD_RELOC_AVR_CALL
This is a 32 bit reloc for the AVR that stores 23 bit value into 22 bits.

BFD_RELOC_390_12
Direct 12 bit.

BFD_RELOC_390_GOT12
12 bit GOT offset.

BFD_RELOC_390_PLT32
32 bit PC relative PLT address.

BFD_RELOC_390_COPY
Copy symbol at runtime.

BFD_RELOC_390_GLOB_DAT
Create GOT entry.

BFD_RELOC_390_JMP_SLOT
Create PLT entry.

BFD_RELOC_390_RELATIVE
Adjust by program base.

BFD_RELOC_390_GOTPC
32 bit PC relative offset to GOT.

BFD_RELOC_390_GOT16
16 bit GOT offset.

BFD_RELOC_390_PC16DBL
PC relative 16 bit shifted by 1.

BFD_RELOC_390_PLT16DBL
16 bit PC rel. PLT shifted by 1.

BFD_RELOC_390_PC32DBL
PC relative 32 bit shifted by 1.

BFD_RELOC_390_PLT32DBL
32 bit PC rel. PLT shifted by 1.

BFD_RELOC_390_GOTPCDBL
32 bit PC rel. GOT shifted by 1.

BFD_RELOC_390_GOT64
64 bit GOT offset.

BFD_RELOC_390_PLT64
64 bit PC relative PLT address.

BFD_RELOC_390_GOTENT
32 bit rel. offset to GOT entry.

BFD_RELOC_VTABLE_INHERIT
BFD_RELOC_VTABLE_ENTRY
These two relocations are used by the linker to determine which of the entries in a C++ virtual function table are actually used. When the -gc-sections option is given, the linker will zero out the entries that are not used, so that the code for those functions need not be included in the output.

VTABLE_INHERIT is a zero-space relocation used to describe to the linker the inheritence tree of a C++ virtual function table. The relocation's symbol should be the parent class' vtable, and the relocation should be located at the child vtable.

VTABLE_ENTRY is a zero-space relocation that describes the use of a virtual function table entry. The reloc's symbol should refer to the table of the class mentioned in the code. Off of that base, an offset describes the entry that is being used. For Rela hosts, this offset is stored in the reloc's addend. For Rel hosts, we are forced to put this offset in the reloc's section offset.

BFD_RELOC_IA64_IMM14
BFD_RELOC_IA64_IMM22
BFD_RELOC_IA64_IMM64
BFD_RELOC_IA64_DIR32MSB
BFD_RELOC_IA64_DIR32LSB
BFD_RELOC_IA64_DIR64MSB
BFD_RELOC_IA64_DIR64LSB
BFD_RELOC_IA64_GPREL22
BFD_RELOC_IA64_GPREL64I
BFD_RELOC_IA64_GPREL32MSB
BFD_RELOC_IA64_GPREL32LSB
BFD_RELOC_IA64_GPREL64MSB
BFD_RELOC_IA64_GPREL64LSB
BFD_RELOC_IA64_LTOFF22
BFD_RELOC_IA64_LTOFF64I
BFD_RELOC_IA64_PLTOFF22
BFD_RELOC_IA64_PLTOFF64I
BFD_RELOC_IA64_PLTOFF64MSB
BFD_RELOC_IA64_PLTOFF64LSB
BFD_RELOC_IA64_FPTR64I
BFD_RELOC_IA64_FPTR32MSB
BFD_RELOC_IA64_FPTR32LSB
BFD_RELOC_IA64_FPTR64MSB
BFD_RELOC_IA64_FPTR64LSB
BFD_RELOC_IA64_PCREL21B
BFD_RELOC_IA64_PCREL21BI
BFD_RELOC_IA64_PCREL21M
BFD_RELOC_IA64_PCREL21F
BFD_RELOC_IA64_PCREL22
BFD_RELOC_IA64_PCREL60B
BFD_RELOC_IA64_PCREL64I
BFD_RELOC_IA64_PCREL32MSB
BFD_RELOC_IA64_PCREL32LSB
BFD_RELOC_IA64_PCREL64MSB
BFD_RELOC_IA64_PCREL64LSB
BFD_RELOC_IA64_LTOFF_FPTR22
BFD_RELOC_IA64_LTOFF_FPTR64I
BFD_RELOC_IA64_LTOFF_FPTR32MSB
BFD_RELOC_IA64_LTOFF_FPTR32LSB
BFD_RELOC_IA64_LTOFF_FPTR64MSB
BFD_RELOC_IA64_LTOFF_FPTR64LSB
BFD_RELOC_IA64_SEGREL32MSB
BFD_RELOC_IA64_SEGREL32LSB
BFD_RELOC_IA64_SEGREL64MSB
BFD_RELOC_IA64_SEGREL64LSB
BFD_RELOC_IA64_SECREL32MSB
BFD_RELOC_IA64_SECREL32LSB
BFD_RELOC_IA64_SECREL64MSB
BFD_RELOC_IA64_SECREL64LSB
BFD_RELOC_IA64_REL32MSB
BFD_RELOC_IA64_REL32LSB
BFD_RELOC_IA64_REL64MSB
BFD_RELOC_IA64_REL64LSB
BFD_RELOC_IA64_LTV32MSB
BFD_RELOC_IA64_LTV32LSB
BFD_RELOC_IA64_LTV64MSB
BFD_RELOC_IA64_LTV64LSB
BFD_RELOC_IA64_IPLTMSB
BFD_RELOC_IA64_IPLTLSB
BFD_RELOC_IA64_COPY
BFD_RELOC_IA64_TPREL22
BFD_RELOC_IA64_TPREL64MSB
BFD_RELOC_IA64_TPREL64LSB
BFD_RELOC_IA64_LTOFF_TP22
BFD_RELOC_IA64_LTOFF22X
BFD_RELOC_IA64_LDXMOV
Intel IA64 Relocations.

BFD_RELOC_M68HC11_HI8
Motorola 68HC11 reloc. This is the 8 bits high part of an absolute address.

BFD_RELOC_M68HC11_LO8
Motorola 68HC11 reloc. This is the 8 bits low part of an absolute address.

BFD_RELOC_M68HC11_3B
Motorola 68HC11 reloc. This is the 3 bits of a value.

BFD_RELOC_CRIS_BDISP8
BFD_RELOC_CRIS_UNSIGNED_5
BFD_RELOC_CRIS_SIGNED_6
BFD_RELOC_CRIS_UNSIGNED_6
BFD_RELOC_CRIS_UNSIGNED_4
These relocs are only used within the CRIS assembler. They are not (at present) written to any object files.

BFD_RELOC_CRIS_COPY
BFD_RELOC_CRIS_GLOB_DAT
BFD_RELOC_CRIS_JUMP_SLOT
BFD_RELOC_CRIS_RELATIVE
Relocs used in ELF shared libraries for CRIS.

BFD_RELOC_CRIS_32_GOT
32-bit offset to symbol-entry within GOT.

BFD_RELOC_CRIS_16_GOT
16-bit offset to symbol-entry within GOT.

BFD_RELOC_CRIS_32_GOTPLT
32-bit offset to symbol-entry within GOT, with PLT handling.

BFD_RELOC_CRIS_16_GOTPLT
16-bit offset to symbol-entry within GOT, with PLT handling.

BFD_RELOC_CRIS_32_GOTREL
32-bit offset to symbol, relative to GOT.

BFD_RELOC_CRIS_32_PLT_GOTREL
32-bit offset to symbol with PLT entry, relative to GOT.

BFD_RELOC_CRIS_32_PLT_PCREL
32-bit offset to symbol with PLT entry, relative to this relocation.

BFD_RELOC_860_COPY
BFD_RELOC_860_GLOB_DAT
BFD_RELOC_860_JUMP_SLOT
BFD_RELOC_860_RELATIVE
BFD_RELOC_860_PC26
BFD_RELOC_860_PLT26
BFD_RELOC_860_PC16
BFD_RELOC_860_LOW0
BFD_RELOC_860_SPLIT0
BFD_RELOC_860_LOW1
BFD_RELOC_860_SPLIT1
BFD_RELOC_860_LOW2
BFD_RELOC_860_SPLIT2
BFD_RELOC_860_LOW3
BFD_RELOC_860_LOGOT0
BFD_RELOC_860_SPGOT0
BFD_RELOC_860_LOGOT1
BFD_RELOC_860_SPGOT1
BFD_RELOC_860_LOGOTOFF0
BFD_RELOC_860_SPGOTOFF0
BFD_RELOC_860_LOGOTOFF1
BFD_RELOC_860_SPGOTOFF1
BFD_RELOC_860_LOGOTOFF2
BFD_RELOC_860_LOGOTOFF3
BFD_RELOC_860_LOPC
BFD_RELOC_860_HIGHADJ
BFD_RELOC_860_HAGOT
BFD_RELOC_860_HAGOTOFF
BFD_RELOC_860_HAPC
BFD_RELOC_860_HIGH
BFD_RELOC_860_HIGOT
BFD_RELOC_860_HIGOTOFF
Intel i860 Relocations.

BFD_RELOC_OPENRISC_ABS_26
BFD_RELOC_OPENRISC_REL_26
OpenRISC Relocations.

BFD_RELOC_H8_DIR16A8
BFD_RELOC_H8_DIR16R8
BFD_RELOC_H8_DIR24A8
BFD_RELOC_H8_DIR24R8
BFD_RELOC_H8_DIR32A16
H8 elf Relocations.

BFD_RELOC_XSTORMY16_REL_12
BFD_RELOC_XSTORMY16_24
BFD_RELOC_XSTORMY16_FPTR16
Sony Xstormy16 Relocations.

typedef enum bfd_reloc_code_real bfd_reloc_code_real_type;
bfd_reloc_type_lookup

Synopsis

reloc_howto_type *
bfd_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code);
Description
Return a pointer to a howto structure which, when invoked, will perform the relocation code on data from the architecture noted.
bfd_default_reloc_type_lookup

Synopsis

reloc_howto_type *bfd_default_reloc_type_lookup
   (bfd *abfd, bfd_reloc_code_real_type  code);
Description
Provides a default relocation lookup routine for any architecture.
bfd_get_reloc_code_name

Synopsis

const char *bfd_get_reloc_code_name (bfd_reloc_code_real_type code);
Description
Provides a printable name for the supplied relocation code. Useful mainly for printing error messages.
bfd_generic_relax_section

Synopsis

boolean bfd_generic_relax_section
   (bfd *abfd,
    asection *section,
    struct bfd_link_info *,
    boolean *);
Description
Provides default handling for relaxing for back ends which don't do relaxing - i.e., does nothing.
bfd_generic_gc_sections

Synopsis

boolean bfd_generic_gc_sections
   (bfd *, struct bfd_link_info *);
Description
Provides default handling for relaxing for back ends which don't do section gc - i.e., does nothing.
bfd_generic_merge_sections

Synopsis

boolean bfd_generic_merge_sections
   (bfd *, struct bfd_link_info *);
Description
Provides default handling for SEC_MERGE section merging for back ends which don't have SEC_MERGE support - i.e., does nothing.
bfd_generic_get_relocated_section_contents

Synopsis

bfd_byte *
bfd_generic_get_relocated_section_contents (bfd *abfd,
    struct bfd_link_info *link_info,
    struct bfd_link_order *link_order,
    bfd_byte *data,
    boolean relocateable,
    asymbol **symbols);
Description
Provides default handling of relocation effort for back ends which can't be bothered to do it efficiently.