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elf32.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-2-1/backends/platform/psp/elf32.h $
 * $Id: elf32.h 48634 2010-04-12 07:28:54Z fingolfin $
 *
 */

#ifndef BACKENDS_ELF_H
#define BACKENDS_ELF_H

/* ELF stuff */

typedef unsigned short Elf32_Half, Elf32_Section;
typedef unsigned int Elf32_Word, Elf32_Addr, Elf32_Off;
typedef signed int  Elf32_Sword;
typedef Elf32_Half Elf32_Versym;

#define EI_NIDENT (16)
#define SELFMAG         6

/* ELF File format structures. Look up ELF structure for more details */

// ELF header (contains info about the file)
typedef struct {
      unsigned char e_ident[EI_NIDENT];     /* Magic number and other info */
      Elf32_Half    e_type;                 /* Object file type */
      Elf32_Half    e_machine;              /* Architecture */
      Elf32_Word    e_version;              /* Object file version */
      Elf32_Addr    e_entry;                /* Entry point virtual address */
      Elf32_Off     e_phoff;                /* Program header table file offset */
      Elf32_Off     e_shoff;                /* Section header table file offset */
      Elf32_Word    e_flags;                /* Processor-specific flags */
      Elf32_Half    e_ehsize;               /* ELF header size in bytes */
      Elf32_Half    e_phentsize;            /* Program header table entry size */
      Elf32_Half    e_phnum;                /* Program header table entry count */
      Elf32_Half    e_shentsize;            /* Section header table entry size */
      Elf32_Half    e_shnum;                /* Section header table entry count */
      Elf32_Half    e_shstrndx;             /* Section header string table index */
} Elf32_Ehdr;

// Should be in e_ident
#define ELFMAG          "\177ELF\1\1"     /* ELF Magic number */

// e_type values
#define ET_NONE         0     /* no file type */
#define ET_REL          1     /* relocatable */
#define ET_EXEC         2     /* executable */
#define ET_DYN          3     /* shared object */
#define ET_CORE         4     /* core file */

// e_machine values
#define EM_MIPS         8


// Program header (contains info about segment)
typedef struct {
      Elf32_Word    p_type;                 /* Segment type */
      Elf32_Off     p_offset;               /* Segment file offset */
      Elf32_Addr    p_vaddr;                /* Segment virtual address */
      Elf32_Addr    p_paddr;                /* Segment physical address */
      Elf32_Word    p_filesz;               /* Segment size in file */
      Elf32_Word    p_memsz;                /* Segment size in memory */
      Elf32_Word    p_flags;                /* Segment flags */
      Elf32_Word    p_align;                /* Segment alignment */
} Elf32_Phdr;

// p_type values
#define PT_NULL         0     /* ignored */
#define PT_LOAD               1     /* loadable segment */
#define PT_DYNAMIC            2     /* dynamic linking info */
#define PT_INTERP       3     /* info about interpreter */
#define PT_NOTE               4     /* note segment */
#define PT_SHLIB        5     /* reserved */
#define PT_PHDR               6     /* Program header table */
#define PT_MIPS_REGINFO 0x70000000  /* register usage info */

// p_flags value
#define PF_X      1     /* execute */
#define PF_W      2     /* write */
#define PF_R      4     /* read */

// Section header (contains info about section)
typedef struct {
      Elf32_Word    sh_name;                /* Section name (string tbl index) */
      Elf32_Word    sh_type;                /* Section type */
      Elf32_Word    sh_flags;               /* Section flags */
      Elf32_Addr    sh_addr;                /* Section virtual addr at execution */
      Elf32_Off     sh_offset;              /* Section file offset */
      Elf32_Word    sh_size;                /* Section size in bytes */
      Elf32_Word    sh_link;                /* Link to another section */
      Elf32_Word    sh_info;                /* Additional section information */
      Elf32_Word    sh_addralign;           /* Section alignment */
      Elf32_Word    sh_entsize;             /* Entry size if section holds table */
} Elf32_Shdr;

// sh_type values
#define SHT_NULL              0     /* Inactive section */
#define SHT_PROGBITS          1     /* Proprietary */
#define SHT_SYMTAB                  2     /* Symbol table */
#define SHT_STRTAB                  3     /* String table */
#define SHT_RELA              4     /* Relocation entries with addend */
#define SHT_HASH              5     /* Symbol hash table */
#define SHT_DYNAMIC                 6     /* Info for dynamic linking */
#define SHT_NOTE              7     /* Note section */
#define SHT_NOBITS                  8     /* Occupies no space */
#define SHT_REL                     9     /* Relocation entries without addend */
#define SHT_SHLIB             10    /* Reserved */
#define SHT_DYNSYM                  11    /* Minimal set of dynamic linking symbols */
#define SHT_MIPS_LIBLSIT      0x70000000  /* Info about dynamic shared object libs */
#define SHT_MIPS_CONFLICT     0x70000002  /* Conflicts btw executables and shared objects */
#define SHT_MIPS_GPTAB        0x70000003  /* Global pointer table */

// sh_flags values
#define SHF_WRITE       0     /* writable section */
#define SHF_ALLOC       2     /* section occupies memory */
#define SHF_EXECINSTR   4     /* machine instructions */
#define SHF_MIPS_GPREL  0x10000000  /* Must be made part of global data area */


// Symbol entry (contain info about a symbol)
typedef struct {
      Elf32_Word    st_name;                /* Symbol name (string tbl index) */
      Elf32_Addr    st_value;               /* Symbol value */
      Elf32_Word    st_size;                /* Symbol size */
      unsigned char st_info;                /* Symbol type and binding */
      unsigned char st_other;               /* Symbol visibility */
      Elf32_Section st_shndx;               /* Section index */
} Elf32_Sym;

// Extract from the st_info
#define SYM_TYPE(x)           ((x)&0xF)
#define SYM_BIND(x)           ((x)>>4)


// Symbol binding values from st_info
#define STB_LOCAL       0     /* Symbol not visible outside object */
#define STB_GLOBAL      1     /* Symbol visible to all object files */
#define STB_WEAK  2     /* Similar to STB_GLOBAL */

// Symbol type values from st_info
#define STT_NOTYPE      0     /* Not specified */
#define STT_OBJECT      1     /* Data object e.g. variable */
#define STT_FUNC  2     /* Function */
#define STT_SECTION     3     /* Section */
#define STT_FILE  4     /* Source file associated with object file */

// Special section header index values from st_shndex
#define SHN_UNDEF             0
#define SHN_LOPROC            0xFF00      /* Extended values */
#define SHN_ABS               0xFFF1      /* Absolute value: don't relocate */
#define SHN_COMMON            0xFFF2      /* Common block. Not allocated yet */
#define SHN_HIPROC            0xFF1F
#define SHN_HIRESERVE   0xFFFF

// Relocation entry (info about how to relocate)
00174 typedef struct {
      Elf32_Addr    r_offset;               /* Address */
      Elf32_Word    r_info;                 /* Relocation type and symbol index */
} Elf32_Rel;

// Access macros for the relocation info
#define REL_TYPE(x)           ((x)&0xFF)              /* Extract relocation type */
#define REL_INDEX(x)    ((x)>>8)                /* Extract relocation index into symbol table */

// MIPS relocation types
#define R_MIPS_NONE           0
#define R_MIPS_16       1
#define R_MIPS_32       2
#define R_MIPS_REL32    3
#define R_MIPS_26       4
#define R_MIPS_HI16           5
#define R_MIPS_LO16           6
#define R_MIPS_GPREL16  7
#define R_MIPS_LITERAL  8
#define R_MIPS_GOT16    9
#define R_MIPS_PC16           10
#define R_MIPS_CALL16   11
#define R_MIPS_GPREL32  12
#define R_MIPS_GOTHI16  13
#define R_MIPS_GOTLO16  14
#define R_MIPS_CALLHI16 15
#define R_MIPS_CALLLO16 16

// Mock function to get value of global pointer
#define getGP()   ({    \
      unsigned int __valgp;   \
      __asm__ ("add %0, $gp, $0" : "=r"(__valgp) : ); \
      __valgp; \
})

#endif /* BACKENDS_ELF_H */

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