LXR qemu/bsd-user/openbsd/target_os

   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
  65static 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 */
 148