source: trunk/kernel/libk/elf.h @ 36

Last change on this file since 36 was 1, checked in by alain, 8 years ago

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1/* This file defines standard ELF types, structures, and macros.
2   Copyright (C) 1995-2003,2004,2005,2006,2007,2008,2009
3        Free Software Foundation, Inc.
4   This file is part of the GNU C Library.
5
6   The GNU C Library is free software; you can redistribute it and/or
7   modify it under the terms of the GNU Lesser General Public
8   License as published by the Free Software Foundation; either
9   version 2.1 of the License, or (at your option) any later version.
10
11   The GNU C Library is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   Lesser General Public License for more details.
15
16   You should have received a copy of the GNU Lesser General Public
17   License along with the GNU C Library; if not, write to the Free
18   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19   02111-1307 USA.  */
20
21#ifndef _ELF_H_
22#define _ELF_H_ 1
23
24#include <hal_types.h>
25
26/* Standard ELF types.  */
27
28/* Type for a 16-bit quantity.  */
29typedef uint16_t Elf32_Half;
30
31/* Types for signed and unsigned 32-bit quantities.  */
32typedef uint32_t Elf32_Word;
33typedef int32_t  Elf32_Sword;
34
35/* Types for signed and unsigned 64-bit quantities.  */
36typedef uint64_t Elf32_Xword;
37typedef int64_t  Elf32_Sxword;
38
39/* Type of addresses.  */
40typedef uint32_t Elf32_Addr;
41
42/* Type of file offsets.  */
43typedef uint32_t Elf32_Off;
44
45/* Type for section indices, which are 16-bit quantities.  */
46typedef uint16_t Elf32_Section;
47
48/* Type for version symbol information.  */
49typedef Elf32_Half Elf32_Versym;
50
51/*************************************************************************************
52 * This structure defines the ELF file header (first bytes in the file)
53 *************************************************************************************/
54
55#define EI_NIDENT (16)
56
57typedef struct
58{
59        unsigned char   e_ident[EI_NIDENT];     /* Magic number and other info */
60        Elf32_Half      e_type;             /* Object file type */
61        Elf32_Half      e_machine;          /* Architecture */
62        Elf32_Word      e_version;          /* Object file version */
63        Elf32_Addr          e_entry;            /* Entry point virtual address */
64        Elf32_Off           e_phoff;            /* Program header table file offset */
65        Elf32_Off           e_shoff;            /* Section header table file offset */
66        Elf32_Word      e_flags;            /* Processor-specific flags */
67        Elf32_Half      e_ehsize;           /* ELF header size in bytes */
68        Elf32_Half      e_phentsize;        /* Program header table entry size */
69        Elf32_Half      e_phnum;            /* Program header table entry count */
70        Elf32_Half      e_shentsize;        /* Section header table entry size */
71        Elf32_Half      e_shnum;            /* Section header table entry count */
72        Elf32_Half      e_shstrndx;         /* Section header string table index */
73} 
74Elf32_Ehdr;
75
76/* Fields in the e_ident array.  The EI_* macros are indices into the
77   array.  The macros under each EI_* macro are the values the byte
78   may have.  */
79
80#define EI_MAG0         0               /* File identification byte 0 index */
81#define ELFMAG0         0x7f            /* Magic number byte 0 */
82
83#define EI_MAG1         1               /* File identification byte 1 index */
84#define ELFMAG1         'E'             /* Magic number byte 1 */
85
86#define EI_MAG2         2               /* File identification byte 2 index */
87#define ELFMAG2         'L'             /* Magic number byte 2 */
88
89#define EI_MAG3         3               /* File identification byte 3 index */
90#define ELFMAG3         'F'             /* Magic number byte 3 */
91
92
93#define EI_CLASS        4               /* File class byte index */
94#define ELFCLASSNONE    0               /* Invalid class */
95#define ELFCLASS32      1               /* 32-bit objects */
96#define ELFCLASSNUM     3
97
98#define EI_DATA         5               /* Data encoding byte index */
99#define ELFDATANONE     0               /* Invalid data encoding */
100#define ELFDATA2LSB     1               /* 2's complement, little endian */
101#define ELFDATA2MSB     2               /* 2's complement, big endian */
102#define ELFDATANUM      3
103
104#define EI_VERSION      6               /* File version byte index */
105                                        /* Value must be EV_CURRENT */
106
107#define EI_OSABI        7               /* OS ABI identification */
108#define ELFOSABI_NONE           0       /* UNIX System V ABI */
109
110/* Legal values for e_type (object file type).  */
111
112#define ET_NONE         0               /* No file type */
113#define ET_REL          1               /* Relocatable file */
114#define ET_EXEC         2               /* Executable file */
115#define ET_DYN          3               /* Shared object file */
116#define ET_CORE         4               /* Core file */
117#define ET_NUM          5               /* Number of defined types */
118#define ET_LOOS         0xfe00          /* OS-specific range start */
119#define ET_HIOS         0xfeff          /* OS-specific range end */
120#define ET_LOPROC       0xff00          /* Processor-specific range start */
121#define ET_HIPROC       0xffff          /* Processor-specific range end */
122
123/* Legal values for e_machine (architecture).  */
124
125#define EM_NONE          0              /* No machine */
126#define EM_386           3              /* Intel 80386 */
127#define EM_860           7              /* Intel 80860 */
128#define EM_MIPS          8              /* MIPS R3000 big-endian */
129#define EM_MIPS_RS3_LE  10              /* MIPS R3000 little-endian */
130#define EM_PPC          20              /* PowerPC */
131#define EM_PPC64        21              /* PowerPC 64-bit */
132#define EM_ARM          40              /* ARM */
133
134/* Legal values for e_version (version).  */
135
136#define EV_NONE         0               /* Invalid ELF version */
137#define EV_CURRENT      1               /* Current version */
138#define EV_NUM          2
139
140/* Program segment header.  */
141
142typedef struct
143{
144        Elf32_Word      p_type;         /* Segment type */
145        Elf32_Off       p_offset;       /* Segment file offset */
146        Elf32_Addr      p_vaddr;        /* Segment virtual address */
147        Elf32_Addr      p_paddr;        /* Segment physical address */
148        Elf32_Word      p_filesz;       /* Segment size in file */
149        Elf32_Word      p_memsz;        /* Segment size in memory */
150        Elf32_Word      p_flags;        /* Segment flags */
151        Elf32_Word      p_align;    /* Segment alignment */
152} 
153Elf32_Phdr;
154
155/* Legal values for p_type (segment type).  */
156
157#define PT_NULL         0               /* Program header table entry unused */
158#define PT_LOAD         1               /* Loadable program segment */
159#define PT_DYNAMIC      2               /* Dynamic linking information */
160#define PT_INTERP       3               /* Program interpreter */
161#define PT_NOTE         4               /* Auxiliary information */
162#define PT_SHLIB        5               /* Reserved */
163#define PT_PHDR         6               /* Entry for header table itself */
164#define PT_TLS          7               /* Thread-local storage segment */
165#define PT_NUM          8               /* Number of defined types */
166#define PT_LOOS         0x60000000      /* Start of OS-specific */
167#define PT_GNU_EH_FRAME 0x6474e550      /* GCC .eh_frame_hdr segment */
168#define PT_GNU_STACK    0x6474e551      /* Indicates stack executability */
169#define PT_GNU_RELRO    0x6474e552      /* Read-only after relocation */
170#define PT_LOSUNW       0x6ffffffa
171#define PT_SUNWBSS      0x6ffffffa      /* Sun Specific segment */
172#define PT_SUNWSTACK    0x6ffffffb      /* Stack segment */
173#define PT_HISUNW       0x6fffffff
174#define PT_HIOS         0x6fffffff      /* End of OS-specific */
175#define PT_LOPROC       0x70000000      /* Start of processor-specific */
176#define PT_HIPROC       0x7fffffff      /* End of processor-specific */
177
178/* Legal values for p_flags (segment flags).  */
179
180#define PF_X            (1 << 0)        /* Segment is executable */
181#define PF_W            (1 << 1)        /* Segment is writable */
182#define PF_R            (1 << 2)        /* Segment is readable */
183#define PF_MASKOS       0x0ff00000      /* OS-specific */
184#define PF_MASKPROC     0xf0000000      /* Processor-specific */
185
186
187
188/****************************************************************************************
189 * This function register in VMM the CODE and DATA vsegs defined in the .elf file.
190 * The segments are not loaded in memory.
191 * It register also the process entry point in VMM.
192 ****************************************************************************************
193 * @ pathname : .elf file pathname (in user space => must use hal_uspace API).
194 * @ process  : local pointer on target process descriptor.
195 ***************************************************************************************/
196error_t elf_load_process( char      * pathname,
197                          process_t * process);
198
199
200#endif  /* elf.h */
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