arch/powerpc/boot/elf_util.c

Source file repositories/reference/linux-study-clean/arch/powerpc/boot/elf_util.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/boot/elf_util.c
Extension
.c
Size
2217 bytes
Lines
79
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) Paul Mackerras 1997.
 *
 * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
 */
#include <stdarg.h>
#include <stddef.h>
#include "elf.h"
#include "page.h"
#include "string.h"
#include "stdio.h"

int parse_elf64(void *hdr, struct elf_info *info)
{
	Elf64_Ehdr *elf64 = hdr;
	Elf64_Phdr *elf64ph;
	unsigned int i;

	if (!(elf64->e_ident[EI_MAG0]  == ELFMAG0	&&
	      elf64->e_ident[EI_MAG1]  == ELFMAG1	&&
	      elf64->e_ident[EI_MAG2]  == ELFMAG2	&&
	      elf64->e_ident[EI_MAG3]  == ELFMAG3	&&
	      elf64->e_ident[EI_CLASS] == ELFCLASS64	&&
#ifdef __LITTLE_ENDIAN__
	      elf64->e_ident[EI_DATA]  == ELFDATA2LSB	&&
#else
	      elf64->e_ident[EI_DATA]  == ELFDATA2MSB	&&
#endif
	      (elf64->e_type            == ET_EXEC ||
	       elf64->e_type            == ET_DYN)	&&
	      elf64->e_machine         == EM_PPC64))
		return 0;

	elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
				 (unsigned long)elf64->e_phoff);
	for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++)
		if (elf64ph->p_type == PT_LOAD)
			break;
	if (i >= (unsigned int)elf64->e_phnum)
		return 0;

	info->loadsize = (unsigned long)elf64ph->p_filesz;
	info->memsize = (unsigned long)elf64ph->p_memsz;
	info->elfoffset = (unsigned long)elf64ph->p_offset;

	return 1;
}

int parse_elf32(void *hdr, struct elf_info *info)
{
	Elf32_Ehdr *elf32 = hdr;
	Elf32_Phdr *elf32ph;
	unsigned int i;

	if (!(elf32->e_ident[EI_MAG0]  == ELFMAG0	&&
	      elf32->e_ident[EI_MAG1]  == ELFMAG1	&&
	      elf32->e_ident[EI_MAG2]  == ELFMAG2	&&
	      elf32->e_ident[EI_MAG3]  == ELFMAG3	&&
	      elf32->e_ident[EI_CLASS] == ELFCLASS32	&&
	      elf32->e_ident[EI_DATA]  == ELFDATA2MSB	&&
	      (elf32->e_type            == ET_EXEC ||
	       elf32->e_type            == ET_DYN)      &&
	      elf32->e_machine         == EM_PPC))
		return 0;

	elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
	for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
		if (elf32ph->p_type == PT_LOAD)
			break;
	if (i >= elf32->e_phnum)
		return 0;

	info->loadsize = elf32ph->p_filesz;
	info->memsize = elf32ph->p_memsz;
	info->elfoffset = elf32ph->p_offset;
	return 1;
}

Annotation

Implementation Notes