17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * GRUB -- GRand Unified Bootloader 37c478bd9Sstevel@tonic-gate * Copyright (C) 2001,2002 Free Software Foundation, Inc. 47c478bd9Sstevel@tonic-gate * 57c478bd9Sstevel@tonic-gate * This program is free software; you can redistribute it and/or modify 67c478bd9Sstevel@tonic-gate * it under the terms of the GNU General Public License as published by 77c478bd9Sstevel@tonic-gate * the Free Software Foundation; either version 2 of the License, or 87c478bd9Sstevel@tonic-gate * (at your option) any later version. 97c478bd9Sstevel@tonic-gate * 107c478bd9Sstevel@tonic-gate * This program is distributed in the hope that it will be useful, 117c478bd9Sstevel@tonic-gate * but WITHOUT ANY WARRANTY; without even the implied warranty of 127c478bd9Sstevel@tonic-gate * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 137c478bd9Sstevel@tonic-gate * GNU General Public License for more details. 147c478bd9Sstevel@tonic-gate * 157c478bd9Sstevel@tonic-gate * You should have received a copy of the GNU General Public License 167c478bd9Sstevel@tonic-gate * along with this program; if not, write to the Free Software 177c478bd9Sstevel@tonic-gate * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 187c478bd9Sstevel@tonic-gate */ 197c478bd9Sstevel@tonic-gate 207c478bd9Sstevel@tonic-gate /* 32-bit data types */ 217c478bd9Sstevel@tonic-gate 227c478bd9Sstevel@tonic-gate typedef unsigned long Elf32_Addr; 237c478bd9Sstevel@tonic-gate typedef unsigned short Elf32_Half; 247c478bd9Sstevel@tonic-gate typedef unsigned long Elf32_Off; 257c478bd9Sstevel@tonic-gate typedef signed long Elf32_Sword; 267c478bd9Sstevel@tonic-gate typedef unsigned long Elf32_Word; 277c478bd9Sstevel@tonic-gate /* "unsigned char" already exists */ 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate /* ELF header */ 307c478bd9Sstevel@tonic-gate typedef struct 317c478bd9Sstevel@tonic-gate { 327c478bd9Sstevel@tonic-gate 337c478bd9Sstevel@tonic-gate #define EI_NIDENT 16 347c478bd9Sstevel@tonic-gate 357c478bd9Sstevel@tonic-gate /* first four characters are defined below */ 367c478bd9Sstevel@tonic-gate #define EI_MAG0 0 377c478bd9Sstevel@tonic-gate #define ELFMAG0 0x7f 387c478bd9Sstevel@tonic-gate #define EI_MAG1 1 397c478bd9Sstevel@tonic-gate #define ELFMAG1 'E' 407c478bd9Sstevel@tonic-gate #define EI_MAG2 2 417c478bd9Sstevel@tonic-gate #define ELFMAG2 'L' 427c478bd9Sstevel@tonic-gate #define EI_MAG3 3 437c478bd9Sstevel@tonic-gate #define ELFMAG3 'F' 447c478bd9Sstevel@tonic-gate 457c478bd9Sstevel@tonic-gate #define EI_CLASS 4 /* data sizes */ 467c478bd9Sstevel@tonic-gate #define ELFCLASS32 1 /* i386 -- up to 32-bit data sizes present */ 477c478bd9Sstevel@tonic-gate 487c478bd9Sstevel@tonic-gate #define EI_DATA 5 /* data type and ordering */ 497c478bd9Sstevel@tonic-gate #define ELFDATA2LSB 1 /* i386 -- LSB 2's complement */ 507c478bd9Sstevel@tonic-gate 517c478bd9Sstevel@tonic-gate #define EI_VERSION 6 /* version number. "e_version" must be the same */ 527c478bd9Sstevel@tonic-gate #define EV_CURRENT 1 /* current version number */ 537c478bd9Sstevel@tonic-gate 547c478bd9Sstevel@tonic-gate #define EI_OSABI 7 /* operating system/ABI indication */ 557c478bd9Sstevel@tonic-gate #define ELFOSABI_FREEBSD 9 567c478bd9Sstevel@tonic-gate 577c478bd9Sstevel@tonic-gate #define EI_ABIVERSION 8 /* ABI version */ 587c478bd9Sstevel@tonic-gate 597c478bd9Sstevel@tonic-gate #define EI_PAD 9 /* from here in is just padding */ 607c478bd9Sstevel@tonic-gate 617c478bd9Sstevel@tonic-gate #define EI_BRAND 8 /* start of OS branding (This is 627c478bd9Sstevel@tonic-gate obviously illegal against the ELF 637c478bd9Sstevel@tonic-gate standard.) */ 647c478bd9Sstevel@tonic-gate 657c478bd9Sstevel@tonic-gate unsigned char e_ident[EI_NIDENT]; /* basic identification block */ 667c478bd9Sstevel@tonic-gate 677c478bd9Sstevel@tonic-gate #define ET_EXEC 2 /* we only care about executable types */ 687c478bd9Sstevel@tonic-gate Elf32_Half e_type; /* file types */ 697c478bd9Sstevel@tonic-gate 707c478bd9Sstevel@tonic-gate #define EM_386 3 /* i386 -- obviously use this one */ 717c478bd9Sstevel@tonic-gate Elf32_Half e_machine; /* machine types */ 727c478bd9Sstevel@tonic-gate Elf32_Word e_version; /* use same as "EI_VERSION" above */ 737c478bd9Sstevel@tonic-gate Elf32_Addr e_entry; /* entry point of the program */ 747c478bd9Sstevel@tonic-gate Elf32_Off e_phoff; /* program header table file offset */ 757c478bd9Sstevel@tonic-gate Elf32_Off e_shoff; /* section header table file offset */ 767c478bd9Sstevel@tonic-gate Elf32_Word e_flags; /* flags */ 777c478bd9Sstevel@tonic-gate Elf32_Half e_ehsize; /* elf header size in bytes */ 787c478bd9Sstevel@tonic-gate Elf32_Half e_phentsize; /* program header entry size */ 797c478bd9Sstevel@tonic-gate Elf32_Half e_phnum; /* number of entries in program header */ 807c478bd9Sstevel@tonic-gate Elf32_Half e_shentsize; /* section header entry size */ 817c478bd9Sstevel@tonic-gate Elf32_Half e_shnum; /* number of entries in section header */ 827c478bd9Sstevel@tonic-gate 837c478bd9Sstevel@tonic-gate #define SHN_UNDEF 0 847c478bd9Sstevel@tonic-gate #define SHN_LORESERVE 0xff00 857c478bd9Sstevel@tonic-gate #define SHN_LOPROC 0xff00 867c478bd9Sstevel@tonic-gate #define SHN_HIPROC 0xff1f 877c478bd9Sstevel@tonic-gate #define SHN_ABS 0xfff1 887c478bd9Sstevel@tonic-gate #define SHN_COMMON 0xfff2 897c478bd9Sstevel@tonic-gate #define SHN_HIRESERVE 0xffff 907c478bd9Sstevel@tonic-gate Elf32_Half e_shstrndx; /* section header table index */ 917c478bd9Sstevel@tonic-gate } 927c478bd9Sstevel@tonic-gate Elf32_Ehdr; 937c478bd9Sstevel@tonic-gate 947c478bd9Sstevel@tonic-gate 957c478bd9Sstevel@tonic-gate #define BOOTABLE_I386_ELF(h) \ 967c478bd9Sstevel@tonic-gate ((h.e_ident[EI_MAG0] == ELFMAG0) & (h.e_ident[EI_MAG1] == ELFMAG1) \ 977c478bd9Sstevel@tonic-gate & (h.e_ident[EI_MAG2] == ELFMAG2) & (h.e_ident[EI_MAG3] == ELFMAG3) \ 987c478bd9Sstevel@tonic-gate & (h.e_ident[EI_CLASS] == ELFCLASS32) & (h.e_ident[EI_DATA] == ELFDATA2LSB) \ 997c478bd9Sstevel@tonic-gate & (h.e_ident[EI_VERSION] == EV_CURRENT) & (h.e_type == ET_EXEC) \ 1007c478bd9Sstevel@tonic-gate & (h.e_machine == EM_386) & (h.e_version == EV_CURRENT)) 1017c478bd9Sstevel@tonic-gate 1027c478bd9Sstevel@tonic-gate /* section table - ? */ 1037c478bd9Sstevel@tonic-gate typedef struct 1047c478bd9Sstevel@tonic-gate { 1057c478bd9Sstevel@tonic-gate Elf32_Word sh_name; /* Section name (string tbl index) */ 1067c478bd9Sstevel@tonic-gate Elf32_Word sh_type; /* Section type */ 1077c478bd9Sstevel@tonic-gate Elf32_Word sh_flags; /* Section flags */ 1087c478bd9Sstevel@tonic-gate Elf32_Addr sh_addr; /* Section virtual addr at execution */ 1097c478bd9Sstevel@tonic-gate Elf32_Off sh_offset; /* Section file offset */ 1107c478bd9Sstevel@tonic-gate Elf32_Word sh_size; /* Section size in bytes */ 1117c478bd9Sstevel@tonic-gate Elf32_Word sh_link; /* Link to another section */ 1127c478bd9Sstevel@tonic-gate Elf32_Word sh_info; /* Additional section information */ 1137c478bd9Sstevel@tonic-gate Elf32_Word sh_addralign; /* Section alignment */ 1147c478bd9Sstevel@tonic-gate Elf32_Word sh_entsize; /* Entry size if section holds table */ 1157c478bd9Sstevel@tonic-gate } 1167c478bd9Sstevel@tonic-gate Elf32_Shdr; 1177c478bd9Sstevel@tonic-gate 1187c478bd9Sstevel@tonic-gate /* symbol table - page 4-25, figure 4-15 */ 1197c478bd9Sstevel@tonic-gate typedef struct 1207c478bd9Sstevel@tonic-gate { 1217c478bd9Sstevel@tonic-gate Elf32_Word st_name; 1227c478bd9Sstevel@tonic-gate Elf32_Addr st_value; 1237c478bd9Sstevel@tonic-gate Elf32_Word st_size; 1247c478bd9Sstevel@tonic-gate unsigned char st_info; 1257c478bd9Sstevel@tonic-gate unsigned char st_other; 1267c478bd9Sstevel@tonic-gate Elf32_Half st_shndx; 1277c478bd9Sstevel@tonic-gate } 1287c478bd9Sstevel@tonic-gate Elf32_Sym; 1297c478bd9Sstevel@tonic-gate 1307c478bd9Sstevel@tonic-gate /* symbol type and binding attributes - page 4-26 */ 1317c478bd9Sstevel@tonic-gate 1327c478bd9Sstevel@tonic-gate #define ELF32_ST_BIND(i) ((i) >> 4) 1337c478bd9Sstevel@tonic-gate #define ELF32_ST_TYPE(i) ((i) & 0xf) 1347c478bd9Sstevel@tonic-gate #define ELF32_ST_INFO(b,t) (((b)<<4)+((t)&0xf)) 1357c478bd9Sstevel@tonic-gate 1367c478bd9Sstevel@tonic-gate /* symbol binding - page 4-26, figure 4-16 */ 1377c478bd9Sstevel@tonic-gate 1387c478bd9Sstevel@tonic-gate #define STB_LOCAL 0 1397c478bd9Sstevel@tonic-gate #define STB_GLOBAL 1 1407c478bd9Sstevel@tonic-gate #define STB_WEAK 2 1417c478bd9Sstevel@tonic-gate #define STB_LOPROC 13 1427c478bd9Sstevel@tonic-gate #define STB_HIPROC 15 1437c478bd9Sstevel@tonic-gate 1447c478bd9Sstevel@tonic-gate /* symbol types - page 4-28, figure 4-17 */ 1457c478bd9Sstevel@tonic-gate 1467c478bd9Sstevel@tonic-gate #define STT_NOTYPE 0 1477c478bd9Sstevel@tonic-gate #define STT_OBJECT 1 1487c478bd9Sstevel@tonic-gate #define STT_FUNC 2 1497c478bd9Sstevel@tonic-gate #define STT_SECTION 3 1507c478bd9Sstevel@tonic-gate #define STT_FILE 4 1517c478bd9Sstevel@tonic-gate #define STT_LOPROC 13 1527c478bd9Sstevel@tonic-gate #define STT_HIPROC 15 1537c478bd9Sstevel@tonic-gate 1547c478bd9Sstevel@tonic-gate 1557c478bd9Sstevel@tonic-gate /* Macros to split/combine relocation type and symbol page 4-32 */ 1567c478bd9Sstevel@tonic-gate 1577c478bd9Sstevel@tonic-gate #define ELF32_R_SYM(__i) ((__i)>>8) 1587c478bd9Sstevel@tonic-gate #define ELF32_R_TYPE(__i) ((unsigned char) (__i)) 1597c478bd9Sstevel@tonic-gate #define ELF32_R_INFO(__s, __t) (((__s)<<8) + (unsigned char) (__t)) 1607c478bd9Sstevel@tonic-gate 1617c478bd9Sstevel@tonic-gate 1627c478bd9Sstevel@tonic-gate /* program header - page 5-2, figure 5-1 */ 1637c478bd9Sstevel@tonic-gate 1647c478bd9Sstevel@tonic-gate typedef struct 1657c478bd9Sstevel@tonic-gate { 1667c478bd9Sstevel@tonic-gate Elf32_Word p_type; 1677c478bd9Sstevel@tonic-gate Elf32_Off p_offset; 1687c478bd9Sstevel@tonic-gate Elf32_Addr p_vaddr; 1697c478bd9Sstevel@tonic-gate Elf32_Addr p_paddr; 1707c478bd9Sstevel@tonic-gate Elf32_Word p_filesz; 1717c478bd9Sstevel@tonic-gate Elf32_Word p_memsz; 1727c478bd9Sstevel@tonic-gate Elf32_Word p_flags; 1737c478bd9Sstevel@tonic-gate Elf32_Word p_align; 1747c478bd9Sstevel@tonic-gate } 1757c478bd9Sstevel@tonic-gate Elf32_Phdr; 1767c478bd9Sstevel@tonic-gate 1777c478bd9Sstevel@tonic-gate /* segment types - page 5-3, figure 5-2 */ 1787c478bd9Sstevel@tonic-gate 1797c478bd9Sstevel@tonic-gate #define PT_NULL 0 1807c478bd9Sstevel@tonic-gate #define PT_LOAD 1 1817c478bd9Sstevel@tonic-gate #define PT_DYNAMIC 2 1827c478bd9Sstevel@tonic-gate #define PT_INTERP 3 1837c478bd9Sstevel@tonic-gate #define PT_NOTE 4 1847c478bd9Sstevel@tonic-gate #define PT_SHLIB 5 1857c478bd9Sstevel@tonic-gate #define PT_PHDR 6 1867c478bd9Sstevel@tonic-gate 1877c478bd9Sstevel@tonic-gate #define PT_LOPROC 0x70000000 1887c478bd9Sstevel@tonic-gate #define PT_HIPROC 0x7fffffff 1897c478bd9Sstevel@tonic-gate 1907c478bd9Sstevel@tonic-gate /* segment permissions - page 5-6 */ 1917c478bd9Sstevel@tonic-gate 1927c478bd9Sstevel@tonic-gate #define PF_X 0x1 1937c478bd9Sstevel@tonic-gate #define PF_W 0x2 1947c478bd9Sstevel@tonic-gate #define PF_R 0x4 1957c478bd9Sstevel@tonic-gate #define PF_MASKPROC 0xf0000000 1967c478bd9Sstevel@tonic-gate 1977c478bd9Sstevel@tonic-gate 1987c478bd9Sstevel@tonic-gate /* dynamic structure - page 5-15, figure 5-9 */ 1997c478bd9Sstevel@tonic-gate 2007c478bd9Sstevel@tonic-gate typedef struct 2017c478bd9Sstevel@tonic-gate { 2027c478bd9Sstevel@tonic-gate Elf32_Sword d_tag; 2037c478bd9Sstevel@tonic-gate union 2047c478bd9Sstevel@tonic-gate { 2057c478bd9Sstevel@tonic-gate Elf32_Word d_val; 2067c478bd9Sstevel@tonic-gate Elf32_Addr d_ptr; 2077c478bd9Sstevel@tonic-gate } 2087c478bd9Sstevel@tonic-gate d_un; 2097c478bd9Sstevel@tonic-gate } 2107c478bd9Sstevel@tonic-gate Elf32_Dyn; 2117c478bd9Sstevel@tonic-gate 2127c478bd9Sstevel@tonic-gate /* Dynamic array tags - page 5-16, figure 5-10. */ 2137c478bd9Sstevel@tonic-gate 2147c478bd9Sstevel@tonic-gate #define DT_NULL 0 2157c478bd9Sstevel@tonic-gate #define DT_NEEDED 1 2167c478bd9Sstevel@tonic-gate #define DT_PLTRELSZ 2 2177c478bd9Sstevel@tonic-gate #define DT_PLTGOT 3 2187c478bd9Sstevel@tonic-gate #define DT_HASH 4 2197c478bd9Sstevel@tonic-gate #define DT_STRTAB 5 2207c478bd9Sstevel@tonic-gate #define DT_SYMTAB 6 2217c478bd9Sstevel@tonic-gate #define DT_RELA 7 2227c478bd9Sstevel@tonic-gate #define DT_RELASZ 8 2237c478bd9Sstevel@tonic-gate #define DT_RELAENT 9 2247c478bd9Sstevel@tonic-gate #define DT_STRSZ 10 2257c478bd9Sstevel@tonic-gate #define DT_SYMENT 11 2267c478bd9Sstevel@tonic-gate #define DT_INIT 12 2277c478bd9Sstevel@tonic-gate #define DT_FINI 13 2287c478bd9Sstevel@tonic-gate #define DT_SONAME 14 2297c478bd9Sstevel@tonic-gate #define DT_RPATH 15 2307c478bd9Sstevel@tonic-gate #define DT_SYMBOLIC 16 2317c478bd9Sstevel@tonic-gate #define DT_REL 17 2327c478bd9Sstevel@tonic-gate #define DT_RELSZ 18 2337c478bd9Sstevel@tonic-gate #define DT_RELENT 19 2347c478bd9Sstevel@tonic-gate #define DT_PLTREL 20 2357c478bd9Sstevel@tonic-gate #define DT_DEBUG 21 2367c478bd9Sstevel@tonic-gate #define DT_TEXTREL 22 2377c478bd9Sstevel@tonic-gate #define DT_JMPREL 23 238