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 #ifndef _TARGET_OS_ELF_H_
  20 #define _TARGET_OS_ELF_H_
  21
  22 #include "target_arch_elf.h"
  23 #include "elf.h"
  24
  25 #define bsd_get_ncpu() 1 /* until we pull in bsd-proc.[hc] */
  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 /* XXX Look at the other conflicting AT_* values. */
  42 #define FREEBSD_AT_NCPUS     19
  43 #define FREEBSD_AT_HWCAP     25
  44 #define FREEBSD_AT_HWCAP2    26
  45
  46 #ifdef TARGET_ABI32
  47 #undef ELF_CLASS
  48 #define ELF_CLASS ELFCLASS32
  49 #undef bswaptls
  50 #define bswaptls(ptr) bswap32s(ptr)
  51 #endif
  52
  53 /* max code+data+bss space allocated to elf interpreter */
  54 #define INTERP_MAP_SIZE (32 * 1024 * 1024)
  55
  56 /* max code+data+bss+brk space allocated to ET_DYN executables */
  57 #define ET_DYN_MAP_SIZE (128 * 1024 * 1024)
  58
  59 /* Necessary parameters */
  60 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
  61 #define TARGET_ELF_PAGESTART(_v) ((_v) & \
  62         ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1))
  63 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1))
  64
  65 #define DLINFO_ITEMS 14
  66
  67 static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc,
  68                                           abi_ulong stringp,
  69                                           struct elfhdr *exec,
  70                                           abi_ulong load_addr,
  71                                           abi_ulong load_bias,
  72                                           abi_ulong interp_load_addr,
  73                                           struct image_info *info)
  74 {
  75         abi_ulong features, sp;
  76         int size;
  77         const int n = sizeof(elf_addr_t);
  78
  79         target_auxents_sz = 0;
  80         sp = p;
  81         /*
  82          * Force 16 byte _final_ alignment here for generality.
  83          */
  84         sp = sp & ~(abi_ulong)15;
  85         size = (DLINFO_ITEMS + 1) * 2;
  86         size += envc + argc + 2;
  87         size += 1;                      /* argc itself */
  88         size *= n;
  89         if (size & 15) {
  90             sp -= 16 - (size & 15);
  91         }
  92
  93         /*
  94          * FreeBSD defines elf_addr_t as Elf32_Off / Elf64_Off
  95          */
  96 #define NEW_AUX_ENT(id, val) do {               \
  97             sp -= n; put_user_ual(val, sp);     \
  98             sp -= n; put_user_ual(id, sp);      \
  99             target_auxents_sz += 2 * n;         \
 100           } while (0)
 101
 102         NEW_AUX_ENT(AT_NULL, 0);
 103
 104         /* There must be exactly DLINFO_ITEMS entries here.  */
 105         NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff));
 106         NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr)));
 107         NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
 108         NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
 109         NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr));
 110         NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
 111         NEW_AUX_ENT(FREEBSD_AT_NCPUS, (abi_ulong)bsd_get_ncpu());
 112         NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
 113         features = ELF_HWCAP;
 114         NEW_AUX_ENT(FREEBSD_AT_HWCAP, features);
 115 #ifdef ELF_HWCAP2
 116         features = ELF_HWCAP2;
 117         NEW_AUX_ENT(FREEBSD_AT_HWCAP2, features);
 118 #endif
 119         NEW_AUX_ENT(AT_UID, (abi_ulong)getuid());
 120         NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid());
 121         NEW_AUX_ENT(AT_GID, (abi_ulong)getgid());
 122         NEW_AUX_ENT(AT_EGID, (abi_ulong)getegid());
 123         target_auxents = sp; /* Note where the aux entries are in the target */
 124 #ifdef ARCH_DLINFO
 125         /*
 126          * ARCH_DLINFO must come last so platform specific code can enforce
 127          * special alignment requirements on the AUXV if necessary (eg. PPC).
 128          */
 129         ARCH_DLINFO;
 130 #endif
 131 #undef NEW_AUX_ENT
 132
 133         sp = loader_build_argptr(envc, argc, sp, stringp);
 134         return sp;
 135 }
 136
 137 #endif /* _TARGET_OS_ELF_H_ */