1 /* 2 * freebsd ELF definitions 3 * 4 * Copyright (c) 2013-15 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 #define bsd_get_ncpu() 1 /* until we pull in bsd-proc.[hc] */ 27 28 /* this flag is uneffective under linux too, should be deleted */ 29 #ifndef MAP_DENYWRITE 30 #define MAP_DENYWRITE 0 31 #endif 32 33 /* should probably go in elf.h */ 34 #ifndef ELIBBAD 35 #define ELIBBAD 80 36 #endif 37 38 #ifndef ELF_PLATFORM 39 #define ELF_PLATFORM (NULL) 40 #endif 41 42 /* XXX Look at the other conflicting AT_* values. */ 43 #define FREEBSD_AT_NCPUS 19 44 #define FREEBSD_AT_HWCAP 25 45 #define FREEBSD_AT_HWCAP2 26 46 47 #ifdef TARGET_ABI32 48 #undef ELF_CLASS 49 #define ELF_CLASS ELFCLASS32 50 #undef bswaptls 51 #define bswaptls(ptr) bswap32s(ptr) 52 #endif 53 54 /* max code+data+bss space allocated to elf interpreter */ 55 #define INTERP_MAP_SIZE (32 * 1024 * 1024) 56 57 /* max code+data+bss+brk space allocated to ET_DYN executables */ 58 #define ET_DYN_MAP_SIZE (128 * 1024 * 1024) 59 60 /* Necessary parameters */ 61 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE 62 #define TARGET_ELF_PAGESTART(_v) ((_v) & \ 63 ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1)) 64 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1)) 65 66 #define DLINFO_ITEMS 14 67 68 static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc, 69 abi_ulong stringp, 70 struct elfhdr *exec, 71 abi_ulong load_addr, 72 abi_ulong load_bias, 73 abi_ulong interp_load_addr, 74 struct image_info *info) 75 { 76 abi_ulong features, sp; 77 int size; 78 const int n = sizeof(elf_addr_t); 79 80 target_auxents_sz = 0; 81 sp = p; 82 /* 83 * Force 16 byte _final_ alignment here for generality. 84 */ 85 sp = sp & ~(abi_ulong)15; 86 size = (DLINFO_ITEMS + 1) * 2; 87 size += envc + argc + 2; 88 size += 1; /* argc itself */ 89 size *= n; 90 if (size & 15) { 91 sp -= 16 - (size & 15); 92 } 93 94 /* 95 * FreeBSD defines elf_addr_t as Elf32_Off / Elf64_Off 96 */ 97 #define NEW_AUX_ENT(id, val) do { \ 98 sp -= n; put_user_ual(val, sp); \ 99 sp -= n; put_user_ual(id, sp); \ 100 target_auxents_sz += 2 * n; \ 101 } while (0) 102 103 NEW_AUX_ENT(AT_NULL, 0); 104 105 /* There must be exactly DLINFO_ITEMS entries here. */ 106 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff)); 107 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr))); 108 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); 109 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); 110 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr)); 111 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); 112 NEW_AUX_ENT(FREEBSD_AT_NCPUS, (abi_ulong)bsd_get_ncpu()); 113 NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry); 114 features = ELF_HWCAP; 115 NEW_AUX_ENT(FREEBSD_AT_HWCAP, features); 116 #ifdef ELF_HWCAP2 117 features = ELF_HWCAP2; 118 NEW_AUX_ENT(FREEBSD_AT_HWCAP2, features); 119 #endif 120 NEW_AUX_ENT(AT_UID, (abi_ulong)getuid()); 121 NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid()); 122 NEW_AUX_ENT(AT_GID, (abi_ulong)getgid()); 123 NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid()); 124 target_auxents = sp; /* Note where the aux entries are in the target */ 125 #ifdef ARCH_DLINFO 126 /* 127 * ARCH_DLINFO must come last so platform specific code can enforce 128 * special alignment requirements on the AUXV if necessary (eg. PPC). 129 */ 130 ARCH_DLINFO; 131 #endif 132 #undef NEW_AUX_ENT 133 134 sp = loader_build_argptr(envc, argc, sp, stringp); 135 return sp; 136 } 137 138 #endif /* TARGET_OS_ELF_H */ 139