qemu/include/exec/page-protection.h

/*
 * QEMU page protection definitions.
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 * SPDX-License-Identifier: LGPL-2.1+
 */
#ifndef EXEC_PAGE_PROT_COMMON_H
#define EXEC_PAGE_PROT_COMMON_H

/* same as PROT_xxx */
#define PAGE_READ      0x0001
#define PAGE_WRITE     0x0002
#define PAGE_EXEC      0x0004
#define PAGE_RWX       (PAGE_READ | PAGE_WRITE | PAGE_EXEC)
#define PAGE_VALID     0x0008
/*
 * Original state of the write flag (used when tracking self-modifying code)
 */
#define PAGE_WRITE_ORG 0x0010
/*
 * Invalidate the TLB entry immediately, helpful for s390x
 * Low-Address-Protection. Used with PAGE_WRITE in tlb_set_page_with_attrs()
 */
#define PAGE_WRITE_INV 0x0020
/* For use with page_set_flags: page is being replaced; target_data cleared. */
#define PAGE_RESET     0x0040
/* For linux-user, indicates that the page is MAP_ANON. */
#define PAGE_ANON      0x0080

/* Target-specific bits that will be used via page_get_flags().  */
#define PAGE_TARGET_1  0x0200
#define PAGE_TARGET_2  0x0400

/*
 * For linux-user, indicates that the page is mapped with the same semantics
 * in both guest and host.
 */
#define PAGE_PASSTHROUGH 0x0800

#ifdef CONFIG_USER_ONLY

void TSA_NO_TSA mmap_lock(void);
void TSA_NO_TSA mmap_unlock(void);
bool have_mmap_lock(void);

static inline void mmap_unlock_guard(void *unused)
{
    mmap_unlock();
}

#define WITH_MMAP_LOCK_GUARD() \
    for (int _mmap_lock_iter __attribute__((cleanup(mmap_unlock_guard))) \
         = (mmap_lock(), 0); _mmap_lock_iter == 0; _mmap_lock_iter = 1)
#else

static inline void mmap_lock(void) {}
static inline void mmap_unlock(void) {}
#define WITH_MMAP_LOCK_GUARD()

#endif /* !CONFIG_USER_ONLY */

#endif