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54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
#ifndef COSMOPOLITAN_LIBC_ELF_STRUCT_REL_H_
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#define COSMOPOLITAN_LIBC_ELF_STRUCT_REL_H_
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#include "libc/elf/scalar.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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/*
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* ELF relocation.
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*
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* Relocations let us easily apply fixups to compiled object code. This
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* data structure represents the contents of an `sh_type` w/ `SHT_REL`.
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*
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* @see Elf64_Rela
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*/
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typedef struct Elf64_Rel {
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/*
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* Location to be modified.
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*
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* If `e_type` is `ET_REL` then this is a section data byte offset.
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*
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* If `e_type` isn't `ET_REL` then this is a virtual address.
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*/
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Elf64_Addr r_offset;
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/*
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* Relocation type and symbol.
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*
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* This value may be created using:
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*
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* r_info = ELF64_R_INFO(sym, type);
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*
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* This value may be read using:
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*
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* Elf64_Word sym = ELF64_R_SYM(r_info);
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* Elf64_Word type = ELF64_R_TYPE(r_info);
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*
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* Where `sym` is a symbol index, and `type` might be:
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*
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* - `R_X86_64_64`
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* - `R_X86_64_PC32`
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* - `R_X86_64_GOTPCRELX`
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* - `R_AARCH64_ABS64`
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*
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* Each relocation type specifies a mathematical formula that's used
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* to compute the appropriate value for the fixed-up object code. If
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* it needs an addend, then this struct doesn't have one, but it can
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* still be embedded by the compiler in the location to be modified.
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*/
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Elf64_Xword r_info;
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} Elf64_Rel;
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_ELF_STRUCT_REL_H_ */
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