/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PPC_BOOT_ELF_H_
#define _PPC_BOOT_ELF_H_

/* 32-bit ELF base types. */
typedef unsigned int Elf32_Addr;
typedef unsigned short Elf32_Half;
typedef unsigned int Elf32_Off;
typedef signed int Elf32_Sword;
typedef unsigned int Elf32_Word;

/* 64-bit ELF base types. */
typedef unsigned long long Elf64_Addr;
typedef unsigned short Elf64_Half;
typedef signed short Elf64_SHalf;
typedef unsigned long long Elf64_Off;
typedef signed int Elf64_Sword;
typedef unsigned int Elf64_Word;
typedef unsigned long long Elf64_Xword;
typedef signed long long Elf64_Sxword;

/* These constants are for the segment types stored in the image headers */
#define PT_NULL    0
#define PT_LOAD    1
#define PT_DYNAMIC 2
#define PT_INTERP  3
#define PT_NOTE    4
#define PT_SHLIB   5
#define PT_PHDR    6
#define PT_TLS     7            /* Thread local storage segment */
#define PT_LOOS    0x60000000   /* OS-specific */
#define PT_HIOS    0x6fffffff   /* OS-specific */
#define PT_LOPROC  0x70000000
#define PT_HIPROC  0x7fffffff
#define PT_GNU_EH_FRAME         0x6474e550

#define PT_GNU_STACK    (PT_LOOS + 0x474e551)

/* These constants define the different elf file types */
#define ET_NONE   0
#define ET_REL    1
#define ET_EXEC   2
#define ET_DYN    3
#define ET_CORE   4
#define ET_LOPROC 0xff00
#define ET_HIPROC 0xffff

/* These constants define the various ELF target machines */
#define EM_NONE  0
#define EM_PPC         20       /* PowerPC */
#define EM_PPC64       21       /* PowerPC64 */

#define EI_NIDENT       16

typedef struct elf32_hdr {
        unsigned char e_ident[EI_NIDENT];
        Elf32_Half e_type;
        Elf32_Half e_machine;
        Elf32_Word e_version;
        Elf32_Addr e_entry;     /* Entry point */
        Elf32_Off e_phoff;
        Elf32_Off e_shoff;
        Elf32_Word e_flags;
        Elf32_Half e_ehsize;
        Elf32_Half e_phentsize;
        Elf32_Half e_phnum;
        Elf32_Half e_shentsize;
        Elf32_Half e_shnum;
        Elf32_Half e_shstrndx;
} Elf32_Ehdr;

typedef struct elf64_hdr {
        unsigned char e_ident[16];      /* ELF "magic number" */
        Elf64_Half e_type;
        Elf64_Half e_machine;
        Elf64_Word e_version;
        Elf64_Addr e_entry;     /* Entry point virtual address */
        Elf64_Off e_phoff;      /* Program header table file offset */
        Elf64_Off e_shoff;      /* Section header table file offset */
        Elf64_Word e_flags;
        Elf64_Half e_ehsize;
        Elf64_Half e_phentsize;
        Elf64_Half e_phnum;
        Elf64_Half e_shentsize;
        Elf64_Half e_shnum;
        Elf64_Half e_shstrndx;
} Elf64_Ehdr;

/* These constants define the permissions on sections in the program
   header, p_flags. */
#define PF_R            0x4
#define PF_W            0x2
#define PF_X            0x1

typedef struct elf32_phdr {
        Elf32_Word p_type;
        Elf32_Off p_offset;
        Elf32_Addr p_vaddr;
        Elf32_Addr p_paddr;
        Elf32_Word p_filesz;
        Elf32_Word p_memsz;
        Elf32_Word p_flags;
        Elf32_Word p_align;
} Elf32_Phdr;

typedef struct elf64_phdr {
        Elf64_Word p_type;
        Elf64_Word p_flags;
        Elf64_Off p_offset;     /* Segment file offset */
        Elf64_Addr p_vaddr;     /* Segment virtual address */
        Elf64_Addr p_paddr;     /* Segment physical address */
        Elf64_Xword p_filesz;   /* Segment size in file */
        Elf64_Xword p_memsz;    /* Segment size in memory */
        Elf64_Xword p_align;    /* Segment alignment, file & memory */
} Elf64_Phdr;

#define EI_MAG0         0       /* e_ident[] indexes */
#define EI_MAG1         1
#define EI_MAG2         2
#define EI_MAG3         3
#define EI_CLASS        4
#define EI_DATA         5
#define EI_VERSION      6
#define EI_OSABI        7
#define EI_PAD          8

#define ELFMAG0         0x7f    /* EI_MAG */
#define ELFMAG1         'E'
#define ELFMAG2         'L'
#define ELFMAG3         'F'
#define ELFMAG          "\177ELF"
#define SELFMAG         4

#define ELFCLASSNONE    0       /* EI_CLASS */
#define ELFCLASS32      1
#define ELFCLASS64      2
#define ELFCLASSNUM     3

#define ELFDATANONE     0       /* e_ident[EI_DATA] */
#define ELFDATA2LSB     1
#define ELFDATA2MSB     2

#define EV_NONE         0       /* e_version, EI_VERSION */
#define EV_CURRENT      1
#define EV_NUM          2

#define ELFOSABI_NONE   0
#define ELFOSABI_LINUX  3

struct elf_info {
        unsigned long loadsize;
        unsigned long memsize;
        unsigned long elfoffset;
};
int parse_elf64(void *hdr, struct elf_info *info);
int parse_elf32(void *hdr, struct elf_info *info);

#endif                          /* _PPC_BOOT_ELF_H_ */