target_os_elf.h (4735B)
1 /* 2 * netbsd ELF definitions 3 * 4 * Copyright (c) 2013 Stacey D. Son 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program 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 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #ifndef TARGET_OS_ELF_H 21 #define TARGET_OS_ELF_H 22 23 #include "target_arch_elf.h" 24 #include "elf.h" 25 26 /* this flag is uneffective under linux too, should be deleted */ 27 #ifndef MAP_DENYWRITE 28 #define MAP_DENYWRITE 0 29 #endif 30 31 /* should probably go in elf.h */ 32 #ifndef ELIBBAD 33 #define ELIBBAD 80 34 #endif 35 36 #ifndef ELF_PLATFORM 37 #define ELF_PLATFORM (NULL) 38 #endif 39 40 #ifndef ELF_HWCAP 41 #define ELF_HWCAP 0 42 #endif 43 44 #ifdef TARGET_ABI32 45 #undef ELF_CLASS 46 #define ELF_CLASS ELFCLASS32 47 #undef bswaptls 48 #define bswaptls(ptr) bswap32s(ptr) 49 #endif 50 51 /* max code+data+bss space allocated to elf interpreter */ 52 #define INTERP_MAP_SIZE (32 * 1024 * 1024) 53 54 /* max code+data+bss+brk space allocated to ET_DYN executables */ 55 #define ET_DYN_MAP_SIZE (128 * 1024 * 1024) 56 57 /* Necessary parameters */ 58 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE 59 #define TARGET_ELF_PAGESTART(_v) ((_v) & \ 60 ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1)) 61 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1)) 62 63 #define DLINFO_ITEMS 12 64 65 static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc, 66 abi_ulong stringp, 67 struct elfhdr *exec, 68 abi_ulong load_addr, 69 abi_ulong load_bias, 70 abi_ulong interp_load_addr, 71 struct image_info *info) 72 { 73 abi_ulong sp; 74 int size; 75 abi_ulong u_platform; 76 const char *k_platform; 77 const int n = sizeof(elf_addr_t); 78 79 sp = p; 80 u_platform = 0; 81 k_platform = ELF_PLATFORM; 82 if (k_platform) { 83 size_t len = strlen(k_platform) + 1; 84 sp -= (len + n - 1) & ~(n - 1); 85 u_platform = sp; 86 /* FIXME - check return value of memcpy_to_target() for failure */ 87 memcpy_to_target(sp, k_platform, len); 88 } 89 /* 90 * Force 16 byte _final_ alignment here for generality. 91 */ 92 sp = sp & ~(abi_ulong)15; 93 size = (DLINFO_ITEMS + 1) * 2; 94 if (k_platform) { 95 size += 2; 96 } 97 #ifdef DLINFO_ARCH_ITEMS 98 size += DLINFO_ARCH_ITEMS * 2; 99 #endif 100 size += envc + argc + 2; 101 size += 1; /* argc itself */ 102 size *= n; 103 if (size & 15) { 104 sp -= 16 - (size & 15); 105 } 106 107 /* 108 * NetBSD defines elf_addr_t as Elf32_Off / Elf64_Off 109 */ 110 #define NEW_AUX_ENT(id, val) do { \ 111 sp -= n; put_user_ual(val, sp); \ 112 sp -= n; put_user_ual(id, sp); \ 113 } while (0) 114 115 NEW_AUX_ENT(AT_NULL, 0); 116 117 /* There must be exactly DLINFO_ITEMS entries here. */ 118 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff)); 119 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr))); 120 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); 121 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); 122 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr)); 123 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); 124 NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry); 125 NEW_AUX_ENT(AT_UID, (abi_ulong)getuid()); 126 NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid()); 127 NEW_AUX_ENT(AT_GID, (abi_ulong)getgid()); 128 NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid()); 129 NEW_AUX_ENT(AT_HWCAP, (abi_ulong)ELF_HWCAP); 130 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong)sysconf(_SC_CLK_TCK)); 131 if (k_platform) { 132 NEW_AUX_ENT(AT_PLATFORM, u_platform); 133 } 134 #ifdef ARCH_DLINFO 135 /* 136 * ARCH_DLINFO must come last so platform specific code can enforce 137 * special alignment requirements on the AUXV if necessary (eg. PPC). 138 */ 139 ARCH_DLINFO; 140 #endif 141 #undef NEW_AUX_ENT 142 143 sp = loader_build_argptr(envc, argc, sp, stringp); 144 return sp; 145 } 146 147 #endif /* TARGET_OS_ELF_H */