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 #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 */