bsd-user/openbsd/target_os_elf.h

   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
  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          * OpenBSD 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 */