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 #ifndef _TARGET_OS_ELF_H_ 20 #define _TARGET_OS_ELF_H_ 21 22 #include "target_arch_elf.h" 23 #include "elf.h" 24 25 #define bsd_get_ncpu() 1 /* until we pull in bsd-proc.[hc] */ 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 /* XXX Look at the other conflicting AT_* values. */ 46 #define FREEBSD_AT_NCPUS 19 47 #define FREEBSD_AT_HWCAP 25 48 #define FREEBSD_AT_HWCAP2 26 49 50 #ifdef TARGET_ABI32 51 #undef ELF_CLASS 52 #define ELF_CLASS ELFCLASS32 53 #undef bswaptls 54 #define bswaptls(ptr) bswap32s(ptr) 55 #endif 56 57 /* max code+data+bss space allocated to elf interpreter */ 58 #define INTERP_MAP_SIZE (32 * 1024 * 1024) 59 60 /* max code+data+bss+brk space allocated to ET_DYN executables */ 61 #define ET_DYN_MAP_SIZE (128 * 1024 * 1024) 62 63 /* Necessary parameters */ 64 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE 65 #define TARGET_ELF_PAGESTART(_v) ((_v) & \ 66 ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1)) 67 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1)) 68 69 #define DLINFO_ITEMS 14 70 71 static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc, 72 abi_ulong stringp, 73 struct elfhdr *exec, 74 abi_ulong load_addr, 75 abi_ulong load_bias, 76 abi_ulong interp_load_addr, 77 struct image_info *info) 78 { 79 abi_ulong features, sp; 80 int size; 81 const int n = sizeof(elf_addr_t); 82 83 target_auxents_sz = 0; 84 sp = p; 85 /* 86 * Force 16 byte _final_ alignment here for generality. 87 */ 88 sp = sp & ~(abi_ulong)15; 89 size = (DLINFO_ITEMS + 1) * 2; 90 size += envc + argc + 2; 91 size += 1; /* argc itself */ 92 size *= n; 93 if (size & 15) { 94 sp -= 16 - (size & 15); 95 } 96 97 /* 98 * FreeBSD defines elf_addr_t as Elf32_Off / Elf64_Off 99 */ 100 #define NEW_AUX_ENT(id, val) do { \ 101 sp -= n; put_user_ual(val, sp); \ 102 sp -= n; put_user_ual(id, sp); \ 103 target_auxents_sz += 2 * n; \ 104 } while (0) 105 106 NEW_AUX_ENT(AT_NULL, 0); 107 108 /* There must be exactly DLINFO_ITEMS entries here. */ 109 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff)); 110 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr))); 111 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); 112 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); 113 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr)); 114 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); 115 NEW_AUX_ENT(FREEBSD_AT_NCPUS, (abi_ulong)bsd_get_ncpu()); 116 NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry); 117 NEW_AUX_ENT(AT_UID, (abi_ulong)getuid()); 118 NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid()); 119 NEW_AUX_ENT(AT_GID, (abi_ulong)getgid()); 120 NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid()); 121 features = ELF_HWCAP; 122 NEW_AUX_ENT(FREEBSD_AT_HWCAP, features); 123 target_auxents = sp; /* Note where the aux entries are in the target */ 124 #ifdef ARCH_DLINFO 125 /* 126 * ARCH_DLINFO must come last so platform specific code can enforce 127 * special alignment requirements on the AUXV if necessary (eg. PPC). 128 */ 129 ARCH_DLINFO; 130 #endif 131 #undef NEW_AUX_ENT 132 133 sp = loader_build_argptr(envc, argc, sp, stringp); 134 return sp; 135 } 136 137 #endif /* _TARGET_OS_ELF_H_ */ 138