mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
0c630d95b5
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.
163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
#ifndef COSMOPOLITAN_LIBC_ELF_STRUCT_EHDR_H_
|
|
#define COSMOPOLITAN_LIBC_ELF_STRUCT_EHDR_H_
|
|
#include "libc/elf/scalar.h"
|
|
#if !(__ASSEMBLER__ + __LINKER__ + 0)
|
|
|
|
/*
|
|
* ELF header.
|
|
*/
|
|
typedef struct Elf64_Ehdr {
|
|
|
|
/*
|
|
* Leading bytes of ELF header.
|
|
*
|
|
* - `e_ident[0]` is always `127`
|
|
* - `e_ident[1]` is always `'E'`
|
|
* - `e_ident[2]` is always `'L'`
|
|
* - `e_ident[3]` is always `'F'`
|
|
*
|
|
* - `e_ident[EI_CLASS]` is mandatory and should be:
|
|
*
|
|
* - `ELFCLASSNONE64` if it's an Elf64 image
|
|
* - `ELFCLASSNONE32` if it's an Elf32 image
|
|
* - Otherwise we assume it's an Elf64 image
|
|
*
|
|
* - `e_ident[EI_DATA]` is advisory and could be:
|
|
*
|
|
* - `ELFDATANONE` isn't strictly valid
|
|
* - `ELFDATA2LSB` for little-endian
|
|
* - `ELFDATA2MSB` for big-endian
|
|
*
|
|
* - `e_ident[EI_VERSION]` is advisory and should be:
|
|
*
|
|
* - `EV_NONE` if it's zero or unspecified
|
|
* - `EV_CURRENT` for current ELF version (which is 1)
|
|
*
|
|
* - `e_ident[EI_OSABI]` is mandatory and could be:
|
|
*
|
|
* - `ELFOSABI_NONE` is zero
|
|
* - `ELFOSABI_GNU` is for GNU
|
|
* - `ELFOSABI_SYSV` used by GNU
|
|
* - `ELFOSABI_LINUX` doesn't care
|
|
* - `ELFOSABI_FREEBSD` does care (recommended)
|
|
* - `ELFOSABI_NETBSD` doesn't care (see `PT_NOTE`)
|
|
* - `ELFOSABI_OPENBSD` doesn't care (see `PT_NOTE`)
|
|
*
|
|
* - `e_ident[EI_ABIVERSION]` is advisory
|
|
*
|
|
*/
|
|
unsigned char e_ident[16];
|
|
|
|
/*
|
|
* ELF image type.
|
|
*
|
|
* This field is mandatory and should be one of:
|
|
*
|
|
* - `ET_REL` for `.o` object files
|
|
* - `ET_DYN` for `.so` files and `-pie` executables
|
|
* - `ET_EXEC` for statically-linked executables
|
|
*
|
|
*/
|
|
Elf64_Half e_type;
|
|
|
|
/*
|
|
* ELF machine type.
|
|
*
|
|
* This field is mandatory and could be one of:
|
|
*
|
|
* - `EM_M32` for Bellmac
|
|
* - `EM_X86_64` for Amd64
|
|
* - `EM_AARCH64` for Arm64
|
|
* - `EM_PPC64` for Raptors
|
|
* - `EM_RISCV` for Berkeley
|
|
* - `EM_S390` for System/360
|
|
*
|
|
*/
|
|
Elf64_Half e_machine;
|
|
|
|
/*
|
|
* ELF version.
|
|
*
|
|
* This field is advisory and could be:
|
|
*
|
|
* - `EV_NONE` if it's zero or unspecified
|
|
* - `EV_CURRENT` for current ELF version (which is 1)
|
|
*
|
|
* @see `e_ident[EI_VERSION]`
|
|
*/
|
|
Elf64_Word e_version;
|
|
|
|
/*
|
|
* ELF executable entrypoint.
|
|
*
|
|
* Static executables should use this field to store the virtual
|
|
* address of the _start() function. This field may be zero, for
|
|
* unspecified.
|
|
*/
|
|
Elf64_Addr e_entry;
|
|
|
|
/*
|
|
* `Elf64_Phdr` file offset.
|
|
*
|
|
* This field is mandatory. Object files should set it to zero.
|
|
*/
|
|
Elf64_Off e_phoff;
|
|
|
|
/*
|
|
* `Elf64_Shdr` file offset.
|
|
*
|
|
* This field is advisory.
|
|
*/
|
|
Elf64_Off e_shoff;
|
|
|
|
/*
|
|
* ELF flags.
|
|
*
|
|
* This field is advisory.
|
|
*/
|
|
Elf64_Word e_flags;
|
|
|
|
/*
|
|
* `Elf64_Ehdr` size.
|
|
*
|
|
* This field is advisory and should be 64.
|
|
*/
|
|
Elf64_Half e_ehsize;
|
|
|
|
/*
|
|
* `Elf64_Phdr` element size.
|
|
*
|
|
* This field *is* cared about and should be set to 56. Cosmopolitan
|
|
* permits larger values for the pleasure of it.
|
|
*/
|
|
Elf64_Half e_phentsize;
|
|
|
|
/*
|
|
* `Elf64_Phdr` array count.
|
|
*/
|
|
Elf64_Half e_phnum;
|
|
|
|
/*
|
|
* `Elf64_Shdr` element size.
|
|
*
|
|
* This field is advisory and should be set to 64. Cosmopolitan
|
|
* permits larger values for the pleasure of it.
|
|
*/
|
|
Elf64_Half e_shentsize;
|
|
|
|
/*
|
|
* `Elf64_Shdr` count.
|
|
*
|
|
* This field is advisory.
|
|
*/
|
|
Elf64_Half e_shnum;
|
|
|
|
/*
|
|
* Section header index of section name string table.
|
|
*/
|
|
Elf64_Half e_shstrndx;
|
|
|
|
} Elf64_Ehdr;
|
|
|
|
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
|
|
#endif /* COSMOPOLITAN_LIBC_ELF_STRUCT_EHDR_H_ */
|