linux-user/user-mmap.h

   1 /*
   2  * user-mmap.h: prototypes for linux-user guest binary loader
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef LINUX_USER_USER_MMAP_H
  19 #define LINUX_USER_USER_MMAP_H
  20
  21 /*
  22  * Guest parameters for the ADDR_COMPAT_LAYOUT personality
  23  * (at present this is the only layout supported by QEMU).
  24  *
  25  * TASK_UNMAPPED_BASE: For mmap without hint (addr != 0), the search
  26  * for unused virtual memory begins at TASK_UNMAPPED_BASE.
  27  *
  28  * ELF_ET_DYN_BASE: When the executable is ET_DYN (i.e. PIE), and requires
  29  * an interpreter (i.e. not -static-pie), use ELF_ET_DYN_BASE instead of
  30  * TASK_UNMAPPED_BASE for selecting the address of the executable.
  31  * This provides some distance between the executable and the interpreter,
  32  * which allows the initial brk to be placed immediately after the
  33  * executable and also have room to grow.
  34  *
  35  * task_unmapped_base, elf_et_dyn_base: When the guest address space is
  36  * limited via -R, the values of TASK_UNMAPPED_BASE and ELF_ET_DYN_BASE
  37  * must be adjusted to fit.
  38  */
  39 extern abi_ulong task_unmapped_base;
  40 extern abi_ulong elf_et_dyn_base;
  41
  42 /*
  43  * mmap_next_start: The base address for the next mmap without hint,
  44  * increased after each successful map, starting at task_unmapped_base.
  45  * This is an optimization within QEMU and not part of ADDR_COMPAT_LAYOUT.
  46  */
  47 extern abi_ulong mmap_next_start;
  48
  49 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
  50 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
  51                      int flags, int fd, off_t offset);
  52 int target_munmap(abi_ulong start, abi_ulong len);
  53 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
  54                        abi_ulong new_size, unsigned long flags,
  55                        abi_ulong new_addr);
  56 abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice);
  57 abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong);
  58 void mmap_fork_start(void);
  59 void mmap_fork_end(int child);
  60
  61 abi_ulong target_shmat(CPUArchState *cpu_env, int shmid,
  62                        abi_ulong shmaddr, int shmflg);
  63 abi_long target_shmdt(abi_ulong shmaddr);
  64
  65 #endif /* LINUX_USER_USER_MMAP_H */