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 #ifndef _TARGET_OS_ELF_H_ 20 #define _TARGET_OS_ELF_H_ 21 22 #include "target_arch_elf.h" 23 #include "elf.h" 24 25 /* this flag is uneffective under linux too, should be deleted */ 26 #ifndef MAP_DENYWRITE 27 #define MAP_DENYWRITE 0 28 #endif 29 30 /* should probably go in elf.h */ 31 #ifndef ELIBBAD 32 #define ELIBBAD 80 33 #endif 34 35 #ifndef ELF_PLATFORM 36 #define ELF_PLATFORM (NULL) 37 #endif 38 39 #ifndef ELF_HWCAP 40 #define ELF_HWCAP 0 41 #endif 42 43 #ifdef TARGET_ABI32 44 #undef ELF_CLASS 45 #define ELF_CLASS ELFCLASS32 46 #undef bswaptls 47 #define bswaptls(ptr) bswap32s(ptr) 48 #endif 49 50 /* max code+data+bss space allocated to elf interpreter */ 51 #define INTERP_MAP_SIZE (32 * 1024 * 1024) 52 53 /* max code+data+bss+brk space allocated to ET_DYN executables */ 54 #define ET_DYN_MAP_SIZE (128 * 1024 * 1024) 55 56 /* Necessary parameters */ 57 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE 58 #define TARGET_ELF_PAGESTART(_v) ((_v) & \ 59 ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1)) 60 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1)) 61 62 #define DLINFO_ITEMS 12 63 64 static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc, 65 abi_ulong stringp, 66 struct elfhdr *exec, 67 abi_ulong load_addr, 68 abi_ulong load_bias, 69 abi_ulong interp_load_addr, 70 struct image_info *info) 71 { 72 abi_ulong sp; 73 int size; 74 abi_ulong u_platform; 75 const char *k_platform; 76 const int n = sizeof(elf_addr_t); 77 78 sp = p; 79 u_platform = 0; 80 k_platform = ELF_PLATFORM; 81 if (k_platform) { 82 size_t len = strlen(k_platform) + 1; 83 sp -= (len + n - 1) & ~(n - 1); 84 u_platform = sp; 85 /* FIXME - check return value of memcpy_to_target() for failure */ 86 memcpy_to_target(sp, k_platform, len); 87 } 88 /* 89 * Force 16 byte _final_ alignment here for generality. 90 */ 91 sp = sp & ~(abi_ulong)15; 92 size = (DLINFO_ITEMS + 1) * 2; 93 if (k_platform) { 94 size += 2; 95 } 96 #ifdef DLINFO_ARCH_ITEMS 97 size += DLINFO_ARCH_ITEMS * 2; 98 #endif 99 size += envc + argc + 2; 100 size += 1; /* argc itself */ 101 size *= n; 102 if (size & 15) { 103 sp -= 16 - (size & 15); 104 } 105 106 /* 107 * OpenBSD defines elf_addr_t as Elf32_Off / Elf64_Off 108 */ 109 #define NEW_AUX_ENT(id, val) do { \ 110 sp -= n; put_user_ual(val, sp); \ 111 sp -= n; put_user_ual(id, sp); \ 112 } while (0) 113 114 NEW_AUX_ENT(AT_NULL, 0); 115 116 /* There must be exactly DLINFO_ITEMS entries here. */ 117 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff)); 118 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr))); 119 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); 120 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); 121 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr)); 122 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); 123 NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry); 124 NEW_AUX_ENT(AT_UID, (abi_ulong)getuid()); 125 NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid()); 126 NEW_AUX_ENT(AT_GID, (abi_ulong)getgid()); 127 NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid()); 128 NEW_AUX_ENT(AT_HWCAP, (abi_ulong)ELF_HWCAP); 129 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong)sysconf(_SC_CLK_TCK)); 130 if (k_platform) { 131 NEW_AUX_ENT(AT_PLATFORM, u_platform); 132 } 133 #ifdef ARCH_DLINFO 134 /* 135 * ARCH_DLINFO must come last so platform specific code can enforce 136 * special alignment requirements on the AUXV if necessary (eg. PPC). 137 */ 138 ARCH_DLINFO; 139 #endif 140 #undef NEW_AUX_ENT 141 142 sp = loader_build_argptr(envc, argc, sp, stringp); 143 return sp; 144 } 145 146 #endif /* _TARGET_OS_ELF_H_ */ 147