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kanjitalk755
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@ -1,619 +0,0 @@
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/*
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* vm_alloc.cpp - Wrapper to various virtual memory allocation schemes
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* (supports mmap, vm_allocate or fallbacks to malloc)
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*
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* Basilisk II (C) 1997-2008 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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||||
* GNU General Public License for more details.
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||||
*
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||||
* You should have received a copy of the GNU General Public License
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||||
* along with this program; if not, write to the Free Software
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||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_WIN32_VM
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#define WIN32_LEAN_AND_MEAN /* avoid including junk */
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#include <windows.h>
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include "vm_alloc.h"
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#if defined(__APPLE__) && defined(__MACH__)
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#include <sys/utsname.h>
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#endif
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#ifdef HAVE_MACH_VM
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#ifndef HAVE_MACH_TASK_SELF
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#ifdef HAVE_TASK_SELF
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#define mach_task_self task_self
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#else
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#error "No task_self(), you lose."
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#endif
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#endif
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#endif
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#ifdef HAVE_WIN32_VM
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/* Windows is either ILP32 or LLP64 */
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typedef UINT_PTR vm_uintptr_t;
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#else
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/* Other systems are sane as they are either ILP32 or LP64 */
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typedef unsigned long vm_uintptr_t;
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#endif
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/* We want MAP_32BIT, if available, for SheepShaver and BasiliskII
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because the emulated target is 32-bit and this helps to allocate
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memory so that branches could be resolved more easily (32-bit
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displacement to code in .text), on AMD64 for example. */
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#if defined(__hpux)
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#define MAP_32BIT MAP_ADDR32
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#endif
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#ifndef MAP_32BIT
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#define MAP_32BIT 0
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#endif
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#ifdef __FreeBSD__
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#define FORCE_MAP_32BIT MAP_FIXED
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#else
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#define FORCE_MAP_32BIT MAP_32BIT
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#endif
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#ifndef MAP_ANON
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#define MAP_ANON 0
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#endif
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#ifndef MAP_ANONYMOUS
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#define MAP_ANONYMOUS 0
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#endif
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/* NOTE: on linux MAP_32BIT is only implemented on AMD64
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it is a null op on all other architectures
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thus the MAP_BASE setting below is the only thing
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ensuring low addresses on aarch64 for example */
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#define MAP_EXTRA_FLAGS (MAP_32BIT)
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#ifdef HAVE_MMAP_VM
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#if (defined(__linux__) && defined(__i386__)) || defined(__FreeBSD__) || HAVE_LINKER_SCRIPT
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/* Force a reasonnable address below 0x80000000 on x86 so that we
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don't get addresses above when the program is run on AMD64.
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NOTE: this is empirically determined on Linux/x86. */
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#define MAP_BASE 0x10000000
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#elif DIRECT_ADDRESSING
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/* linux does not implement any useful fallback behavior
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such as allocating the next available address
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and the first 4k-64k of address space is marked unavailable
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for security reasons (see https://wiki.debian.org/mmap_min_addr)
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so we must start requesting after the first page
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or we get a high 64bit address that will crash direct addressing
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leaving NULL unmapped is a good idea anyway for debugging reasons */
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#define MAP_BASE 0x00010000
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#else
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#define MAP_BASE 0x00000000
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#endif
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static char * next_address = (char *)MAP_BASE;
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#ifdef HAVE_MMAP_ANON
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#define map_flags (MAP_ANON | MAP_EXTRA_FLAGS)
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#define zero_fd -1
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#else
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#ifdef HAVE_MMAP_ANONYMOUS
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#define map_flags (MAP_ANONYMOUS | MAP_EXTRA_FLAGS)
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#define zero_fd -1
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#else
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#define map_flags (MAP_EXTRA_FLAGS)
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static int zero_fd = -1;
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#endif
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#endif
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#endif
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/* Translate generic VM map flags to host values. */
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#ifdef HAVE_MMAP_VM
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static int translate_map_flags(int vm_flags)
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{
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int flags = 0;
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if (vm_flags & VM_MAP_SHARED)
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flags |= MAP_SHARED;
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if (vm_flags & VM_MAP_PRIVATE)
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flags |= MAP_PRIVATE;
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if (vm_flags & VM_MAP_FIXED)
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flags |= MAP_FIXED;
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if (vm_flags & VM_MAP_32BIT)
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flags |= FORCE_MAP_32BIT;
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return flags;
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}
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#endif
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/* Align ADDR and SIZE to 64K boundaries. */
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#ifdef HAVE_WIN32_VM
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static inline LPVOID align_addr_segment(LPVOID addr)
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{
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return LPVOID(vm_uintptr_t(addr) & ~vm_uintptr_t(0xFFFF));
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}
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static inline DWORD align_size_segment(LPVOID addr, DWORD size)
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{
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return size + ((vm_uintptr_t)addr - (vm_uintptr_t)align_addr_segment(addr));
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}
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#endif
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/* Translate generic VM prot flags to host values. */
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#ifdef HAVE_WIN32_VM
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static int translate_prot_flags(int prot_flags)
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{
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int prot = PAGE_READWRITE;
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if (prot_flags == (VM_PAGE_EXECUTE | VM_PAGE_READ | VM_PAGE_WRITE))
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prot = PAGE_EXECUTE_READWRITE;
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else if (prot_flags == (VM_PAGE_EXECUTE | VM_PAGE_READ))
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prot = PAGE_EXECUTE_READ;
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else if (prot_flags == (VM_PAGE_READ | VM_PAGE_WRITE))
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prot = PAGE_READWRITE;
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else if (prot_flags == VM_PAGE_READ)
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prot = PAGE_READONLY;
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else if (prot_flags == 0)
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prot = PAGE_NOACCESS;
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return prot;
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}
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#endif
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/* Translate Mach return codes to POSIX errno values. */
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#ifdef HAVE_MACH_VM
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static int vm_error(kern_return_t ret_code)
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{
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switch (ret_code) {
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case KERN_SUCCESS:
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return 0;
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case KERN_INVALID_ADDRESS:
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case KERN_NO_SPACE:
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return ENOMEM;
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case KERN_PROTECTION_FAILURE:
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return EACCES;
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default:
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return EINVAL;
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}
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}
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#endif
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/* Initialize the VM system. Returns 0 if successful, -1 for errors. */
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int vm_init(void)
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{
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#ifdef HAVE_MMAP_VM
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#ifndef zero_fd
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zero_fd = open("/dev/zero", O_RDWR);
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if (zero_fd < 0)
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return -1;
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#endif
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#endif
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// On 10.4 and earlier, reset CrashReporter's task signal handler to
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// avoid having it show up for signals that get handled.
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#if defined(__APPLE__) && defined(__MACH__)
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struct utsname info;
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if (!uname(&info) && atoi(info.release) <= 8) {
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task_set_exception_ports(mach_task_self(),
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EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
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MACH_PORT_NULL,
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EXCEPTION_STATE_IDENTITY,
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MACHINE_THREAD_STATE);
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}
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#endif
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return 0;
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}
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/* Deallocate all internal data used to wrap virtual memory allocators. */
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void vm_exit(void)
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{
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#ifdef HAVE_MMAP_VM
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#ifndef zero_fd
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if (zero_fd != -1) {
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close(zero_fd);
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zero_fd = -1;
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}
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#endif
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#endif
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}
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static void *reserved_buf;
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static const size_t RESERVED_SIZE = 64 * 1024 * 1024; // for 5K Retina
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void *vm_acquire_reserved(size_t size) {
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return reserved_buf && size <= RESERVED_SIZE ? reserved_buf : VM_MAP_FAILED;
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}
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int vm_init_reserved(void *hostAddress) {
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int result = vm_acquire_fixed(hostAddress, RESERVED_SIZE);
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if (result >= 0)
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reserved_buf = hostAddress;
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return result;
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}
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/* Allocate zero-filled memory of SIZE bytes. The mapping is private
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and default protection bits are read / write. The return value
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is the actual mapping address chosen or VM_MAP_FAILED for errors. */
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void * vm_acquire(size_t size, int options)
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{
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void * addr;
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errno = 0;
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// VM_MAP_FIXED are to be used with vm_acquire_fixed() only
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if (options & VM_MAP_FIXED)
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return VM_MAP_FAILED;
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#ifndef HAVE_VM_WRITE_WATCH
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if (options & VM_MAP_WRITE_WATCH)
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return VM_MAP_FAILED;
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#endif
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#if defined(HAVE_MACH_VM)
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// vm_allocate() returns a zero-filled memory region
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kern_return_t ret_code = vm_allocate(mach_task_self(), (vm_address_t *)&addr, reserved_buf ? size : size + RESERVED_SIZE, TRUE);
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if (ret_code != KERN_SUCCESS) {
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errno = vm_error(ret_code);
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return VM_MAP_FAILED;
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}
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if (!reserved_buf)
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reserved_buf = (char *)addr + size;
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#elif defined(HAVE_MMAP_VM)
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int fd = zero_fd;
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int the_map_flags = translate_map_flags(options) | map_flags;
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if ((addr = mmap((caddr_t)next_address, size, VM_PAGE_DEFAULT, the_map_flags, fd, 0)) == (void *)MAP_FAILED)
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return VM_MAP_FAILED;
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#if DIRECT_ADDRESSING
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// If MAP_32BIT and MAP_BASE fail to ensure
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// a 32-bit address crash now instead of later.
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// FIXME: make everything 64-bit clean and tear this all out.
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if(sizeof(void *) > 4 && (options & VM_MAP_32BIT))
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assert((size_t)addr<0xffffffffL);
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#endif
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next_address = (char *)addr + size;
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#elif defined(HAVE_WIN32_VM)
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int alloc_type = MEM_RESERVE | MEM_COMMIT;
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if (options & VM_MAP_WRITE_WATCH)
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alloc_type |= MEM_WRITE_WATCH;
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if ((addr = VirtualAlloc(NULL, size, alloc_type, PAGE_EXECUTE_READWRITE)) == NULL)
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return VM_MAP_FAILED;
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#else
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if ((addr = calloc(size, 1)) == 0)
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return VM_MAP_FAILED;
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// Omit changes for protections because they are not supported in this mode
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return addr;
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#endif
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// Explicitely protect the newly mapped region here because on some systems,
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// say MacOS X, mmap() doesn't honour the requested protection flags.
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if (vm_protect(addr, size, VM_PAGE_DEFAULT) != 0)
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return VM_MAP_FAILED;
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return addr;
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}
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/* Allocate zero-filled memory at exactly ADDR (which must be page-aligned).
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Retuns 0 if successful, -1 on errors. */
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int vm_acquire_fixed(void * addr, size_t size, int options)
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{
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errno = 0;
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// Fixed mappings are required to be private
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if (options & VM_MAP_SHARED)
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return -1;
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#ifndef HAVE_VM_WRITE_WATCH
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if (options & VM_MAP_WRITE_WATCH)
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return -1;
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#endif
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#if defined(HAVE_MACH_VM)
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// vm_allocate() returns a zero-filled memory region
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kern_return_t ret_code = vm_allocate(mach_task_self(), (vm_address_t *)&addr, size, 0);
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if (ret_code != KERN_SUCCESS) {
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errno = vm_error(ret_code);
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return -1;
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}
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#elif defined(HAVE_MMAP_VM)
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int fd = zero_fd;
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int the_map_flags = translate_map_flags(options) | map_flags | MAP_FIXED;
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if (mmap((caddr_t)addr, size, VM_PAGE_DEFAULT, the_map_flags, fd, 0) == (void *)MAP_FAILED)
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return -1;
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#elif defined(HAVE_WIN32_VM)
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// Windows cannot allocate Low Memory
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if (addr == NULL)
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return -1;
|
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|
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int alloc_type = MEM_RESERVE | MEM_COMMIT;
|
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if (options & VM_MAP_WRITE_WATCH)
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alloc_type |= MEM_WRITE_WATCH;
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|
||||
// Allocate a possibly offset region to align on 64K boundaries
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LPVOID req_addr = align_addr_segment(addr);
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DWORD req_size = align_size_segment(addr, size);
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LPVOID ret_addr = VirtualAlloc(req_addr, req_size, alloc_type, PAGE_EXECUTE_READWRITE);
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if (ret_addr != req_addr)
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return -1;
|
||||
#else
|
||||
// Unsupported
|
||||
return -1;
|
||||
#endif
|
||||
|
||||
// Explicitely protect the newly mapped region here because on some systems,
|
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// say MacOS X, mmap() doesn't honour the requested protection flags.
|
||||
if (vm_protect(addr, size, VM_PAGE_DEFAULT) != 0)
|
||||
return -1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Deallocate any mapping for the region starting at ADDR and extending
|
||||
LEN bytes. Returns 0 if successful, -1 on errors. */
|
||||
|
||||
int vm_release(void * addr, size_t size)
|
||||
{
|
||||
// Safety check: don't try to release memory that was not allocated
|
||||
if (addr == VM_MAP_FAILED)
|
||||
return 0;
|
||||
|
||||
#ifdef HAVE_MACH_VM
|
||||
if (vm_deallocate(mach_task_self(), (vm_address_t)addr, size) != KERN_SUCCESS)
|
||||
return -1;
|
||||
#else
|
||||
#ifdef HAVE_MMAP_VM
|
||||
if (munmap((caddr_t)addr, size) != 0)
|
||||
return -1;
|
||||
#else
|
||||
#ifdef HAVE_WIN32_VM
|
||||
if (VirtualFree(align_addr_segment(addr), 0, MEM_RELEASE) == 0)
|
||||
return -1;
|
||||
#else
|
||||
free(addr);
|
||||
#endif
|
||||
#endif
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Change the memory protection of the region starting at ADDR and
|
||||
extending LEN bytes to PROT. Returns 0 if successful, -1 for errors. */
|
||||
|
||||
int vm_protect(void * addr, size_t size, int prot)
|
||||
{
|
||||
#ifdef HAVE_MACH_VM
|
||||
int ret_code = vm_protect(mach_task_self(), (vm_address_t)addr, size, 0, prot);
|
||||
return ret_code == KERN_SUCCESS ? 0 : -1;
|
||||
#else
|
||||
#ifdef HAVE_MMAP_VM
|
||||
int ret_code = mprotect((caddr_t)addr, size, prot);
|
||||
return ret_code == 0 ? 0 : -1;
|
||||
#else
|
||||
#ifdef HAVE_WIN32_VM
|
||||
DWORD old_prot;
|
||||
int ret_code = VirtualProtect(addr, size, translate_prot_flags(prot), &old_prot);
|
||||
return ret_code != 0 ? 0 : -1;
|
||||
#else
|
||||
// Unsupported
|
||||
return -1;
|
||||
#endif
|
||||
#endif
|
||||
#endif
|
||||
}
|
||||
|
||||
/* Return the addresses of the pages that got modified in the
|
||||
specified range [ ADDR, ADDR + SIZE [ since the last reset of the watch
|
||||
bits. Returns 0 if successful, -1 for errors. */
|
||||
|
||||
int vm_get_write_watch(void * addr, size_t size,
|
||||
void ** pages, unsigned int * n_pages,
|
||||
int options)
|
||||
{
|
||||
#ifdef HAVE_VM_WRITE_WATCH
|
||||
#ifdef HAVE_WIN32_VM
|
||||
DWORD flags = 0;
|
||||
if (options & VM_WRITE_WATCH_RESET)
|
||||
flags |= WRITE_WATCH_FLAG_RESET;
|
||||
|
||||
ULONG page_size;
|
||||
ULONG_PTR count = *n_pages;
|
||||
int ret_code = GetWriteWatch(flags, addr, size, pages, &count, &page_size);
|
||||
if (ret_code != 0)
|
||||
return -1;
|
||||
|
||||
*n_pages = count;
|
||||
return 0;
|
||||
#endif
|
||||
#endif
|
||||
// Unsupported
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Reset the write-tracking state for the specified range [ ADDR, ADDR
|
||||
+ SIZE [. Returns 0 if successful, -1 for errors. */
|
||||
|
||||
int vm_reset_write_watch(void * addr, size_t size)
|
||||
{
|
||||
#ifdef HAVE_VM_WRITE_WATCH
|
||||
#ifdef HAVE_WIN32_VM
|
||||
int ret_code = ResetWriteWatch(addr, size);
|
||||
return ret_code == 0 ? 0 : -1;
|
||||
#endif
|
||||
#endif
|
||||
// Unsupported
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Returns the size of a page. */
|
||||
|
||||
int vm_get_page_size(void)
|
||||
{
|
||||
#ifdef HAVE_WIN32_VM
|
||||
static vm_uintptr_t page_size = 0;
|
||||
if (page_size == 0) {
|
||||
SYSTEM_INFO si;
|
||||
GetSystemInfo(&si);
|
||||
page_size = si.dwAllocationGranularity;
|
||||
}
|
||||
return page_size;
|
||||
#else
|
||||
return getpagesize();
|
||||
#endif
|
||||
}
|
||||
|
||||
#ifdef CONFIGURE_TEST_VM_WRITE_WATCH
|
||||
int main(void)
|
||||
{
|
||||
int i, j;
|
||||
|
||||
vm_init();
|
||||
|
||||
vm_uintptr_t page_size = vm_get_page_size();
|
||||
|
||||
char *area;
|
||||
const int n_pages = 7;
|
||||
const int area_size = n_pages * page_size;
|
||||
const int map_options = VM_MAP_DEFAULT | VM_MAP_WRITE_WATCH;
|
||||
if ((area = (char *)vm_acquire(area_size, map_options)) == VM_MAP_FAILED)
|
||||
return 1;
|
||||
|
||||
unsigned int n_modified_pages_expected = 0;
|
||||
static const int touch_page[n_pages] = { 0, 1, 1, 0, 1, 0, 1 };
|
||||
for (i = 0; i < n_pages; i++) {
|
||||
if (touch_page[i]) {
|
||||
area[i * page_size] = 1;
|
||||
++n_modified_pages_expected;
|
||||
}
|
||||
}
|
||||
|
||||
char *modified_pages[n_pages];
|
||||
unsigned int n_modified_pages = n_pages;
|
||||
if (vm_get_write_watch(area, area_size, (void **)modified_pages, &n_modified_pages) < 0)
|
||||
return 2;
|
||||
if (n_modified_pages != n_modified_pages_expected)
|
||||
return 3;
|
||||
for (i = 0, j = 0; i < n_pages; i++) {
|
||||
char v = area[i * page_size];
|
||||
if ((touch_page[i] && !v) || (!touch_page[i] && v))
|
||||
return 4;
|
||||
if (!touch_page[i])
|
||||
continue;
|
||||
if (modified_pages[j] != (area + i * page_size))
|
||||
return 5;
|
||||
++j;
|
||||
}
|
||||
|
||||
vm_release(area, area_size);
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIGURE_TEST_VM_MAP
|
||||
#include <stdlib.h>
|
||||
#include <signal.h>
|
||||
|
||||
static void fault_handler(int sig)
|
||||
{
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/* Tests covered here:
|
||||
- TEST_VM_PROT_* program slices actually succeeds when a crash occurs
|
||||
- TEST_VM_MAP_ANON* program slices succeeds when it could be compiled
|
||||
*/
|
||||
int main(void)
|
||||
{
|
||||
vm_init();
|
||||
|
||||
signal(SIGSEGV, fault_handler);
|
||||
#ifdef SIGBUS
|
||||
signal(SIGBUS, fault_handler);
|
||||
#endif
|
||||
|
||||
#define page_align(address) ((char *)((vm_uintptr_t)(address) & -page_size))
|
||||
vm_uintptr_t page_size = vm_get_page_size();
|
||||
|
||||
const int area_size = 6 * page_size;
|
||||
volatile char * area = (volatile char *) vm_acquire(area_size);
|
||||
volatile char * fault_address = area + (page_size * 7) / 2;
|
||||
|
||||
#if defined(TEST_VM_MMAP_ANON) || defined(TEST_VM_MMAP_ANONYMOUS)
|
||||
if (area == VM_MAP_FAILED)
|
||||
return 1;
|
||||
|
||||
if (vm_release((char *)area, area_size) < 0)
|
||||
return 1;
|
||||
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
#if defined(TEST_VM_PROT_NONE_READ) || defined(TEST_VM_PROT_NONE_WRITE)
|
||||
if (area == VM_MAP_FAILED)
|
||||
return 0;
|
||||
|
||||
if (vm_protect(page_align(fault_address), page_size, VM_PAGE_NOACCESS) < 0)
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
#if defined(TEST_VM_PROT_RDWR_WRITE)
|
||||
if (area == VM_MAP_FAILED)
|
||||
return 1;
|
||||
|
||||
if (vm_protect(page_align(fault_address), page_size, VM_PAGE_READ) < 0)
|
||||
return 1;
|
||||
|
||||
if (vm_protect(page_align(fault_address), page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0)
|
||||
return 1;
|
||||
#endif
|
||||
|
||||
#if defined(TEST_VM_PROT_READ_WRITE)
|
||||
if (vm_protect(page_align(fault_address), page_size, VM_PAGE_READ) < 0)
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
#if defined(TEST_VM_PROT_NONE_READ)
|
||||
// this should cause a core dump
|
||||
char foo = *fault_address;
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
#if defined(TEST_VM_PROT_NONE_WRITE) || defined(TEST_VM_PROT_READ_WRITE)
|
||||
// this should cause a core dump
|
||||
*fault_address = 'z';
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
#if defined(TEST_VM_PROT_RDWR_WRITE)
|
||||
// this should not cause a core dump
|
||||
*fault_address = 'z';
|
||||
return 0;
|
||||
#endif
|
||||
}
|
||||
#endif
|
||||
@ -1,138 +0,0 @@
|
||||
/*
|
||||
* vm_alloc.h - Wrapper to various virtual memory allocation schemes
|
||||
* (supports mmap, vm_allocate or fallbacks to malloc)
|
||||
*
|
||||
* Basilisk II (C) 1997-2008 Christian Bauer
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
*/
|
||||
|
||||
#ifndef VM_ALLOC_H
|
||||
#define VM_ALLOC_H
|
||||
|
||||
#ifdef HAVE_UNISTD_H
|
||||
#include <unistd.h>
|
||||
#include <sys/types.h>
|
||||
#endif
|
||||
#ifdef HAVE_SYS_MMAN_H
|
||||
#include <sys/mman.h>
|
||||
#endif
|
||||
#ifdef HAVE_MACH_VM
|
||||
extern "C" {
|
||||
#include <mach/mach.h>
|
||||
#include <mach/task.h>
|
||||
}
|
||||
#endif
|
||||
|
||||
#include <cassert>
|
||||
|
||||
/* Return value of `vm_acquire' in case of an error. */
|
||||
#ifdef HAVE_MACH_VM
|
||||
#define VM_MAP_FAILED ((void *)-1)
|
||||
#else
|
||||
#ifdef HAVE_MMAP_VM
|
||||
#define VM_MAP_FAILED ((void *)-1)
|
||||
#else
|
||||
#define VM_MAP_FAILED 0
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* Option to vm_get_write_watch() to reset the write-tracking state
|
||||
once it was retrieved. Otherwise, you have to manually call
|
||||
vm_reset_write_watch() and potentially lose some info. */
|
||||
#define VM_WRITE_WATCH_RESET 0x01
|
||||
|
||||
/* Mapping options. */
|
||||
#define VM_MAP_SHARED 0x01
|
||||
#define VM_MAP_PRIVATE 0x02
|
||||
#define VM_MAP_FIXED 0x04
|
||||
#define VM_MAP_32BIT 0x08
|
||||
#define VM_MAP_WRITE_WATCH 0x10
|
||||
|
||||
/* Default mapping options. */
|
||||
#define VM_MAP_DEFAULT (VM_MAP_PRIVATE)
|
||||
|
||||
/* Protection bits. */
|
||||
#ifdef HAVE_MACH_VM
|
||||
#define VM_PAGE_NOACCESS VM_PROT_NONE
|
||||
#define VM_PAGE_READ VM_PROT_READ
|
||||
#define VM_PAGE_WRITE VM_PROT_WRITE
|
||||
#define VM_PAGE_EXECUTE VM_PROT_EXECUTE
|
||||
#else
|
||||
#ifdef HAVE_MMAP_VM
|
||||
#define VM_PAGE_NOACCESS PROT_NONE
|
||||
#define VM_PAGE_READ PROT_READ
|
||||
#define VM_PAGE_WRITE PROT_WRITE
|
||||
#define VM_PAGE_EXECUTE PROT_EXEC
|
||||
#else
|
||||
#define VM_PAGE_NOACCESS 0x0
|
||||
#define VM_PAGE_READ 0x1
|
||||
#define VM_PAGE_WRITE 0x2
|
||||
#define VM_PAGE_EXECUTE 0x4
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* Default protection bits. */
|
||||
#define VM_PAGE_DEFAULT (VM_PAGE_READ | VM_PAGE_WRITE)
|
||||
|
||||
/* Initialize the VM system. Returns 0 if successful, -1 for errors. */
|
||||
|
||||
extern int vm_init(void);
|
||||
|
||||
/* Deallocate all internal data used to wrap virtual memory allocators. */
|
||||
|
||||
extern void vm_exit(void);
|
||||
|
||||
/* Allocate zero-filled memory of SIZE bytes. The mapping is private
|
||||
and default protection bits are read / write. The return value
|
||||
is the actual mapping address chosen or VM_MAP_FAILED for errors. */
|
||||
|
||||
extern void * vm_acquire(size_t size, int options = VM_MAP_DEFAULT);
|
||||
|
||||
extern void * vm_acquire_reserved(size_t size);
|
||||
|
||||
/* Allocate zero-filled memory at exactly ADDR (which must be page-aligned).
|
||||
Returns 0 if successful, -1 on errors. */
|
||||
|
||||
extern int vm_acquire_fixed(void * addr, size_t size, int options = VM_MAP_DEFAULT);
|
||||
|
||||
/* Deallocate any mapping for the region starting at ADDR and extending
|
||||
LEN bytes. Returns 0 if successful, -1 on errors. */
|
||||
|
||||
extern int vm_release(void * addr, size_t size);
|
||||
|
||||
/* Change the memory protection of the region starting at ADDR and
|
||||
extending SIZE bytes to PROT. Returns 0 if successful, -1 for errors. */
|
||||
|
||||
extern int vm_protect(void * addr, size_t size, int prot);
|
||||
|
||||
/* Return the addresses of the pages that got modified since the last
|
||||
reset of the write-tracking state for the specified range [ ADDR,
|
||||
ADDR + SIZE [. Returns 0 if successful, -1 for errors. */
|
||||
|
||||
extern int vm_get_write_watch(void * addr, size_t size,
|
||||
void ** pages, unsigned int * n_pages,
|
||||
int options = 0);
|
||||
|
||||
/* Reset the write-tracking state for the specified range [ ADDR, ADDR
|
||||
+ SIZE [. Returns 0 if successful, -1 for errors. */
|
||||
|
||||
extern int vm_reset_write_watch(void * addr, size_t size);
|
||||
|
||||
/* Returns the size of a page. */
|
||||
|
||||
extern int vm_get_page_size(void);
|
||||
|
||||
#endif /* VM_ALLOC_H */
|
||||
Loading…
Reference in New Issue
Block a user