bsd-user/freebsd/target_os_elf.h

   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
  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 #define bsd_get_ncpu() 1 /* until we pull in bsd-proc.[hc] */
  28
  29 /* this flag is uneffective under linux too, should be deleted */
  30 #ifndef MAP_DENYWRITE
  31 #define MAP_DENYWRITE 0
  32 #endif
  33
  34 /* should probably go in elf.h */
  35 #ifndef ELIBBAD
  36 #define ELIBBAD 80
  37 #endif
  38
  39 #ifndef ELF_PLATFORM
  40 #define ELF_PLATFORM (NULL)
  41 #endif
  42
  43 /* XXX Look at the other conflicting AT_* values. */
  44 #define FREEBSD_AT_NCPUS     19
  45 #define FREEBSD_AT_HWCAP     25
  46 #define FREEBSD_AT_HWCAP2    26
  47
  48 #ifdef TARGET_ABI32
  49 #undef ELF_CLASS
  50 #define ELF_CLASS ELFCLASS32
  51 #undef bswaptls
  52 #define bswaptls(ptr) bswap32s(ptr)
  53 #endif
  54
  55 /* max code+data+bss space allocated to elf interpreter */
  56 #define INTERP_MAP_SIZE (32 * 1024 * 1024)
  57
  58 /* max code+data+bss+brk space allocated to ET_DYN executables */
  59 #define ET_DYN_MAP_SIZE (128 * 1024 * 1024)
  60
  61 /* Necessary parameters */
  62 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
  63 #define TARGET_ELF_PAGESTART(_v) ((_v) & \
  64         ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1))
  65 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1))
  66
  67 #define DLINFO_ITEMS 14
  68
  69 static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc,
  70                                           abi_ulong stringp,
  71                                           struct elfhdr *exec,
  72                                           abi_ulong load_addr,
  73                                           abi_ulong load_bias,
  74                                           abi_ulong interp_load_addr,
  75                                           struct image_info *info)
  76 {
  77         abi_ulong features, sp;
  78         int size;
  79         const int n = sizeof(elf_addr_t);
  80
  81         target_auxents_sz = 0;
  82         sp = p;
  83         /*
  84          * Force 16 byte _final_ alignment here for generality.
  85          */
  86         sp = sp & ~(abi_ulong)15;
  87         size = (DLINFO_ITEMS + 1) * 2;
  88         size += envc + argc + 2;
  89         size += 1;                      /* argc itself */
  90         size *= n;
  91         if (size & 15) {
  92             sp -= 16 - (size & 15);
  93         }
  94
  95         /*
  96          * FreeBSD defines elf_addr_t as Elf32_Off / Elf64_Off
  97          */
  98 #define NEW_AUX_ENT(id, val) do {               \
  99             sp -= n; put_user_ual(val, sp);     \
 100             sp -= n; put_user_ual(id, sp);      \
 101             target_auxents_sz += 2 * n;         \
 102           } while (0)
 103
 104         NEW_AUX_ENT(AT_NULL, 0);
 105
 106         /* There must be exactly DLINFO_ITEMS entries here.  */
 107         NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff));
 108         NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr)));
 109         NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
 110         NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
 111         NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr));
 112         NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
 113         NEW_AUX_ENT(FREEBSD_AT_NCPUS, (abi_ulong)bsd_get_ncpu());
 114         NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
 115         features = ELF_HWCAP;
 116         NEW_AUX_ENT(FREEBSD_AT_HWCAP, features);
 117 #ifdef ELF_HWCAP2
 118         features = ELF_HWCAP2;
 119         NEW_AUX_ENT(FREEBSD_AT_HWCAP2, features);
 120 #endif
 121         NEW_AUX_ENT(AT_UID, (abi_ulong)getuid());
 122         NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid());
 123         NEW_AUX_ENT(AT_GID, (abi_ulong)getgid());
 124         NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid());
 125         target_auxents = sp; /* Note where the aux entries are in the target */
 126 #ifdef ARCH_DLINFO
 127         /*
 128          * ARCH_DLINFO must come last so platform specific code can enforce
 129          * special alignment requirements on the AUXV if necessary (eg. PPC).
 130          */
 131         ARCH_DLINFO;
 132 #endif
 133 #undef NEW_AUX_ENT
 134
 135         sp = loader_build_argptr(envc, argc, sp, stringp);
 136         return sp;
 137 }
 138
 139 #endif /* TARGET_OS_ELF_H */