LXR qemu/bsd-user/netbsd/target_os

   1/*
   2 *  netbsd 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#ifndef _TARGET_OS_ELF_H_
  20#define _TARGET_OS_ELF_H_
  21
  22#include "target_arch_elf.h"
  23#include "elf.h"
  24
  25/* this flag is uneffective under linux too, should be deleted */
  26#ifndef MAP_DENYWRITE
  27#define MAP_DENYWRITE 0
  28#endif
  29
  30/* should probably go in elf.h */
  31#ifndef ELIBBAD
  32#define ELIBBAD 80
  33#endif
  34
  35#ifndef ELF_PLATFORM
  36#define ELF_PLATFORM (NULL)
  37#endif
  38
  39#ifndef ELF_HWCAP
  40#define ELF_HWCAP 0
  41#endif
  42
  43#ifdef TARGET_ABI32
  44#undef ELF_CLASS
  45#define ELF_CLASS ELFCLASS32
  46#undef bswaptls
  47#define bswaptls(ptr) bswap32s(ptr)
  48#endif
  49
  50/* max code+data+bss space allocated to elf interpreter */
  51#define INTERP_MAP_SIZE (32 * 1024 * 1024)
  52
  53/* max code+data+bss+brk space allocated to ET_DYN executables */
  54#define ET_DYN_MAP_SIZE (128 * 1024 * 1024)
  55
  56/* Necessary parameters */
  57#define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
  58#define TARGET_ELF_PAGESTART(_v) ((_v) & \
  59        ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1))
  60#define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1))
  61
  62#define DLINFO_ITEMS 12
  63
  64static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc,
  65                                          abi_ulong stringp,
  66                                          struct elfhdr *exec,
  67                                          abi_ulong load_addr,
  68                                          abi_ulong load_bias,
  69                                          abi_ulong interp_load_addr,
  70                                          struct image_info *info)
  71{
  72        abi_ulong sp;
  73        int size;
  74        abi_ulong u_platform;
  75        const char *k_platform;
  76        const int n = sizeof(elf_addr_t);
  77
  78        sp = p;
  79        u_platform = 0;
  80        k_platform = ELF_PLATFORM;
  81        if (k_platform) {
  82            size_t len = strlen(k_platform) + 1;
  83            sp -= (len + n - 1) & ~(n - 1);
  84            u_platform = sp;
  85            /* FIXME - check return value of memcpy_to_target() for failure */
  86            memcpy_to_target(sp, k_platform, len);
  87        }
  88        /*
  89         * Force 16 byte _final_ alignment here for generality.
  90         */
  91        sp = sp & ~(abi_ulong)15;
  92        size = (DLINFO_ITEMS + 1) * 2;
  93        if (k_platform) {
  94            size += 2;
  95        }
  96#ifdef DLINFO_ARCH_ITEMS
  97        size += DLINFO_ARCH_ITEMS * 2;
  98#endif
  99        size += envc + argc + 2;
 100        size += 1;                         /* argc itself */
 101        size *= n;
 102        if (size & 15) {
 103            sp -= 16 - (size & 15);
 104        }
 105
 106        /*
 107         * NetBSD defines elf_addr_t as Elf32_Off / Elf64_Off
 108         */
 109#define NEW_AUX_ENT(id, val) do {               \
 110            sp -= n; put_user_ual(val, sp);     \
 111            sp -= n; put_user_ual(id, sp);      \
 112          } while (0)
 113
 114        NEW_AUX_ENT(AT_NULL, 0);
 115
 116        /* There must be exactly DLINFO_ITEMS entries here.  */
 117        NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff));
 118        NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr)));
 119        NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
 120        NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
 121        NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr));
 122        NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
 123        NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
 124        NEW_AUX_ENT(AT_UID, (abi_ulong)getuid());
 125        NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid());
 126        NEW_AUX_ENT(AT_GID, (abi_ulong)getgid());
 127        NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid());
 128        NEW_AUX_ENT(AT_HWCAP, (abi_ulong)ELF_HWCAP);
 129        NEW_AUX_ENT(AT_CLKTCK, (abi_ulong)sysconf(_SC_CLK_TCK));
 130        if (k_platform) {
 131            NEW_AUX_ENT(AT_PLATFORM, u_platform);
 132        }
 133#ifdef ARCH_DLINFO
 134        /*
 135         * ARCH_DLINFO must come last so platform specific code can enforce
 136         * special alignment requirements on the AUXV if necessary (eg. PPC).
 137         */
 138        ARCH_DLINFO;
 139#endif
 140#undef NEW_AUX_ENT
 141
 142        sp = loader_build_argptr(envc, argc, sp, stringp);
 143        return sp;
 144}
 145
 146#endif /* _TARGET_OS_ELF_H_ */
 147