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cosmopolitan/libc/elf/struct/rela.h

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Initial import
2020-06-15 14:18:57 +00:00
#ifndef COSMOPOLITAN_LIBC_ELF_STRUCT_RELA_H_
#define COSMOPOLITAN_LIBC_ELF_STRUCT_RELA_H_
#include "libc/elf/scalar.h"
Rewrite Cosmopolitan Ar The build/bootstrap/ar.com program is now tinier. This change reduces its size from 140kb to 53kb. Nothing was traded away. Cosmopolitan Ar performance is now 2x better than llvm-ar largely thanks to using the copy_file_range() system call. This change homebrews a new allocation API that addresses the shortcomings of the C standard library design. Using these new balloc() and reballoc() functions I managed to reduce memory consumption so much that Cosmpolitan Ar should now use roughly 100x fewer bytes of peak resident memory compared to llvm-ar. Correct behavior with better compatibility has been assured. Binary output is now pretty much bit-identical to llvm-ar, as of this change. This can and should be the living proof we need to show that a better world is possible for software.
2023-07-02 17:19:16 +00:00
/*
* ELF relocation w/ explicit addend.
*
* Relocations let us easily apply fixups to compiled object code. This
* data structure represents the contents of an `sh_type` w/ `SHT_RELA`
*
* @see Elf64_Rel
*/
Initial import
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typedef struct Elf64_Rela {
Rewrite Cosmopolitan Ar The build/bootstrap/ar.com program is now tinier. This change reduces its size from 140kb to 53kb. Nothing was traded away. Cosmopolitan Ar performance is now 2x better than llvm-ar largely thanks to using the copy_file_range() system call. This change homebrews a new allocation API that addresses the shortcomings of the C standard library design. Using these new balloc() and reballoc() functions I managed to reduce memory consumption so much that Cosmpolitan Ar should now use roughly 100x fewer bytes of peak resident memory compared to llvm-ar. Correct behavior with better compatibility has been assured. Binary output is now pretty much bit-identical to llvm-ar, as of this change. This can and should be the living proof we need to show that a better world is possible for software.
2023-07-02 17:19:16 +00:00
/*
* Location to be modified.
*
* If `e_type` is `ET_REL` then this is a section data byte offset.
*
* If `e_type` isn't `ET_REL` then this is a virtual address.
*/
Elf64_Addr r_offset;
Initial import
2020-06-15 14:18:57 +00:00
/*
Rewrite Cosmopolitan Ar The build/bootstrap/ar.com program is now tinier. This change reduces its size from 140kb to 53kb. Nothing was traded away. Cosmopolitan Ar performance is now 2x better than llvm-ar largely thanks to using the copy_file_range() system call. This change homebrews a new allocation API that addresses the shortcomings of the C standard library design. Using these new balloc() and reballoc() functions I managed to reduce memory consumption so much that Cosmpolitan Ar should now use roughly 100x fewer bytes of peak resident memory compared to llvm-ar. Correct behavior with better compatibility has been assured. Binary output is now pretty much bit-identical to llvm-ar, as of this change. This can and should be the living proof we need to show that a better world is possible for software.
2023-07-02 17:19:16 +00:00
* Relocation type and symbol.
*
* This value may be created using:
*
* r_info = ELF64_R_INFO(sym, type);
*
* This value may be read using:
*
* Elf64_Word sym = ELF64_R_SYM(r_info);
* Elf64_Word type = ELF64_R_TYPE(r_info);
*
Introduce post-linker that converts ELF to PE If you build a static ELF executable in `ld -q` mode (which leaves rela sections inside the binary) then you can run it through the elf2pe.com program afterwards, which will turn it into a PE executable. We have a new trick for defining WIN32 DLL imports in C without any assembly code. This also achieves the optimally tiny and perfect PE binary structure. We need this because it isn't possible to have a GNU ld linker script generate a PE file where the virtual pointer and the file pointer can drift apart. This post-linker can do that. One cool benefit is we can now use a smaller 512-byte alignment in the file, and an even bigger 64kb alignment for the segment virtual addresses, and the executable ends up being smaller. Another program introduced by this change is pecheck.com which can do extensive linting of PE static executables to help explain why Windows won't load it.
2023-08-10 01:36:38 +00:00
* Where `sym` is a symbol index, and `type` will likely be:
Rewrite Cosmopolitan Ar The build/bootstrap/ar.com program is now tinier. This change reduces its size from 140kb to 53kb. Nothing was traded away. Cosmopolitan Ar performance is now 2x better than llvm-ar largely thanks to using the copy_file_range() system call. This change homebrews a new allocation API that addresses the shortcomings of the C standard library design. Using these new balloc() and reballoc() functions I managed to reduce memory consumption so much that Cosmpolitan Ar should now use roughly 100x fewer bytes of peak resident memory compared to llvm-ar. Correct behavior with better compatibility has been assured. Binary output is now pretty much bit-identical to llvm-ar, as of this change. This can and should be the living proof we need to show that a better world is possible for software.
2023-07-02 17:19:16 +00:00
*
* - `R_X86_64_PC32`
Introduce post-linker that converts ELF to PE If you build a static ELF executable in `ld -q` mode (which leaves rela sections inside the binary) then you can run it through the elf2pe.com program afterwards, which will turn it into a PE executable. We have a new trick for defining WIN32 DLL imports in C without any assembly code. This also achieves the optimally tiny and perfect PE binary structure. We need this because it isn't possible to have a GNU ld linker script generate a PE file where the virtual pointer and the file pointer can drift apart. This post-linker can do that. One cool benefit is we can now use a smaller 512-byte alignment in the file, and an even bigger 64kb alignment for the segment virtual addresses, and the executable ends up being smaller. Another program introduced by this change is pecheck.com which can do extensive linting of PE static executables to help explain why Windows won't load it.
2023-08-10 01:36:38 +00:00
* - `R_X86_64_PLT32`
* - `R_X86_64_32`
* - `R_X86_64_64`
* - `R_X86_64_32S`
* - `R_X86_64_8`
* - `R_X86_64_16`
* - `R_X86_64_DTPOFF32`
* - `R_X86_64_GOTPCREL`
* - `R_X86_64_PC16`
* - `R_X86_64_REX_GOTPCRELX`
* - `R_X86_64_TPOFF32`
Rewrite Cosmopolitan Ar The build/bootstrap/ar.com program is now tinier. This change reduces its size from 140kb to 53kb. Nothing was traded away. Cosmopolitan Ar performance is now 2x better than llvm-ar largely thanks to using the copy_file_range() system call. This change homebrews a new allocation API that addresses the shortcomings of the C standard library design. Using these new balloc() and reballoc() functions I managed to reduce memory consumption so much that Cosmpolitan Ar should now use roughly 100x fewer bytes of peak resident memory compared to llvm-ar. Correct behavior with better compatibility has been assured. Binary output is now pretty much bit-identical to llvm-ar, as of this change. This can and should be the living proof we need to show that a better world is possible for software.
2023-07-02 17:19:16 +00:00
*
Initial import
2020-06-15 14:18:57 +00:00
*/
Rewrite Cosmopolitan Ar The build/bootstrap/ar.com program is now tinier. This change reduces its size from 140kb to 53kb. Nothing was traded away. Cosmopolitan Ar performance is now 2x better than llvm-ar largely thanks to using the copy_file_range() system call. This change homebrews a new allocation API that addresses the shortcomings of the C standard library design. Using these new balloc() and reballoc() functions I managed to reduce memory consumption so much that Cosmpolitan Ar should now use roughly 100x fewer bytes of peak resident memory compared to llvm-ar. Correct behavior with better compatibility has been assured. Binary output is now pretty much bit-identical to llvm-ar, as of this change. This can and should be the living proof we need to show that a better world is possible for software.
2023-07-02 17:19:16 +00:00
Elf64_Xword r_info;
/*
* Relocation parameter.
*
* Each relocation type has its own mathematical formula, which should
* incorporate this value in its own unique way.
*/
Elf64_Sxword r_addend;
Initial import
2020-06-15 14:18:57 +00:00
} Elf64_Rela;
#endif /* COSMOPOLITAN_LIBC_ELF_STRUCT_RELA_H_ */
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