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Peter Maydell5423e6d2021-09-08 16:44:01 +01001/*
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
Richard Hendersonc8fb5cf2023-08-02 14:25:27 -070021/*
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 *
Richard Hendersonda2b71f2023-08-02 15:17:33 -070028 * 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.
Richard Hendersonc8fb5cf2023-08-02 14:25:27 -070038 */
39extern abi_ulong task_unmapped_base;
Richard Hendersonda2b71f2023-08-02 15:17:33 -070040extern abi_ulong elf_et_dyn_base;
Richard Hendersonc8fb5cf2023-08-02 14:25:27 -070041
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 */
47extern abi_ulong mmap_next_start;
48
Peter Maydell5423e6d2021-09-08 16:44:01 +010049int target_mprotect(abi_ulong start, abi_ulong len, int prot);
50abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
Richard Henderson55baec02023-07-07 21:40:41 +010051 int flags, int fd, off_t offset);
Peter Maydell5423e6d2021-09-08 16:44:01 +010052int target_munmap(abi_ulong start, abi_ulong len);
53abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
54 abi_ulong new_size, unsigned long flags,
55 abi_ulong new_addr);
Ilya Leoshkevich892a4f62022-06-21 16:42:05 +020056abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice);
Peter Maydell5423e6d2021-09-08 16:44:01 +010057abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong);
58void mmap_fork_start(void);
59void mmap_fork_end(int child);
60
Richard Henderson225a2062023-08-20 09:24:14 -070061abi_ulong target_shmat(CPUArchState *cpu_env, int shmid,
62 abi_ulong shmaddr, int shmflg);
63abi_long target_shmdt(abi_ulong shmaddr);
64
Peter Maydell5423e6d2021-09-08 16:44:01 +010065#endif /* LINUX_USER_USER_MMAP_H */