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 #endif /* LINUX_USER_USER_MMAP_H */ 62