1 /* 2 * openbsd 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 #include "user/tswap-target.h" 26 27 /* this flag is uneffective under linux too, should be deleted */ 28 #ifndef MAP_DENYWRITE 29 #define MAP_DENYWRITE 0 30 #endif 31 32 /* should probably go in elf.h */ 33 #ifndef ELIBBAD 34 #define ELIBBAD 80 35 #endif 36 37 #ifndef ELF_PLATFORM 38 #define ELF_PLATFORM (NULL) 39 #endif 40 41 #ifndef ELF_HWCAP 42 #define ELF_HWCAP 0 43 #endif 44 45 #ifdef TARGET_ABI32 46 #undef ELF_CLASS 47 #define ELF_CLASS ELFCLASS32 48 #undef bswaptls 49 #define bswaptls(ptr) bswap32s(ptr) 50 #endif 51 52 /* max code+data+bss space allocated to elf interpreter */ 53 #define INTERP_MAP_SIZE (32 * 1024 * 1024) 54 55 /* max code+data+bss+brk space allocated to ET_DYN executables */ 56 #define ET_DYN_MAP_SIZE (128 * 1024 * 1024) 57 58 /* Necessary parameters */ 59 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE 60 #define TARGET_ELF_PAGESTART(_v) ((_v) & \ 61 ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1)) 62 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1)) 63 64 #define DLINFO_ITEMS 12 65 66 static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc, 67 abi_ulong stringp, 68 struct elfhdr *exec, 69 abi_ulong load_addr, 70 abi_ulong load_bias, 71 abi_ulong interp_load_addr, 72 struct image_info *info) 73 { 74 abi_ulong sp; 75 int size; 76 abi_ulong u_platform; 77 const char *k_platform; 78 const int n = sizeof(elf_addr_t); 79 80 sp = p; 81 u_platform = 0; 82 k_platform = ELF_PLATFORM; 83 if (k_platform) { 84 size_t len = strlen(k_platform) + 1; 85 sp -= (len + n - 1) & ~(n - 1); 86 u_platform = sp; 87 /* FIXME - check return value of memcpy_to_target() for failure */ 88 memcpy_to_target(sp, k_platform, len); 89 } 90 /* 91 * Force 16 byte _final_ alignment here for generality. 92 */ 93 sp = sp & ~(abi_ulong)15; 94 size = (DLINFO_ITEMS + 1) * 2; 95 if (k_platform) { 96 size += 2; 97 } 98 #ifdef DLINFO_ARCH_ITEMS 99 size += DLINFO_ARCH_ITEMS * 2; 100 #endif 101 size += envc + argc + 2; 102 size += 1; /* argc itself */ 103 size *= n; 104 if (size & 15) { 105 sp -= 16 - (size & 15); 106 } 107 108 /* 109 * OpenBSD defines elf_addr_t as Elf32_Off / Elf64_Off 110 */ 111 #define NEW_AUX_ENT(id, val) do { \ 112 sp -= n; put_user_ual(val, sp); \ 113 sp -= n; put_user_ual(id, sp); \ 114 } while (0) 115 116 NEW_AUX_ENT(AT_NULL, 0); 117 118 /* There must be exactly DLINFO_ITEMS entries here. */ 119 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff)); 120 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr))); 121 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); 122 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); 123 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr)); 124 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); 125 NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry); 126 NEW_AUX_ENT(AT_UID, (abi_ulong)getuid()); 127 NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid()); 128 NEW_AUX_ENT(AT_GID, (abi_ulong)getgid()); 129 NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid()); 130 NEW_AUX_ENT(AT_HWCAP, (abi_ulong)ELF_HWCAP); 131 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong)sysconf(_SC_CLK_TCK)); 132 if (k_platform) { 133 NEW_AUX_ENT(AT_PLATFORM, u_platform); 134 } 135 #ifdef ARCH_DLINFO 136 /* 137 * ARCH_DLINFO must come last so platform specific code can enforce 138 * special alignment requirements on the AUXV if necessary (eg. PPC). 139 */ 140 ARCH_DLINFO; 141 #endif 142 #undef NEW_AUX_ENT 143 144 sp = loader_build_argptr(envc, argc, sp, stringp); 145 return sp; 146 } 147 148 #endif /* TARGET_OS_ELF_H */ 149