| 1 |
/* |
| 2 |
* vm_alloc.cpp - Wrapper to various virtual memory allocation schemes |
| 3 |
* (supports mmap, vm_allocate or fallbacks to malloc) |
| 4 |
* |
| 5 |
* Basilisk II (C) 1997-2004 Christian Bauer |
| 6 |
* |
| 7 |
* This program is free software; you can redistribute it and/or modify |
| 8 |
* it under the terms of the GNU General Public License as published by |
| 9 |
* the Free Software Foundation; either version 2 of the License, or |
| 10 |
* (at your option) any later version. |
| 11 |
* |
| 12 |
* This program is distributed in the hope that it will be useful, |
| 13 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 |
* GNU General Public License for more details. |
| 16 |
* |
| 17 |
* You should have received a copy of the GNU General Public License |
| 18 |
* along with this program; if not, write to the Free Software |
| 19 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 |
*/ |
| 21 |
|
| 22 |
#ifdef HAVE_CONFIG_H |
| 23 |
#include "config.h" |
| 24 |
#endif |
| 25 |
|
| 26 |
#ifdef HAVE_FCNTL_H |
| 27 |
#include <fcntl.h> |
| 28 |
#endif |
| 29 |
|
| 30 |
#ifdef HAVE_WIN32_VM |
| 31 |
#define WIN32_LEAN_AND_MEAN /* avoid including junk */ |
| 32 |
#include <windows.h> |
| 33 |
#endif |
| 34 |
|
| 35 |
#include <stdio.h> |
| 36 |
#include <stdlib.h> |
| 37 |
#include <string.h> |
| 38 |
#include <limits.h> |
| 39 |
#include "vm_alloc.h" |
| 40 |
|
| 41 |
#ifdef HAVE_MACH_VM |
| 42 |
#ifndef HAVE_MACH_TASK_SELF |
| 43 |
#ifdef HAVE_TASK_SELF |
| 44 |
#define mach_task_self task_self |
| 45 |
#else |
| 46 |
#error "No task_self(), you lose." |
| 47 |
#endif |
| 48 |
#endif |
| 49 |
#endif |
| 50 |
|
| 51 |
/* We want MAP_32BIT, if available, for SheepShaver and BasiliskII |
| 52 |
because the emulated target is 32-bit and this helps to allocate |
| 53 |
memory so that branches could be resolved more easily (32-bit |
| 54 |
displacement to code in .text), on AMD64 for example. */ |
| 55 |
#ifndef MAP_32BIT |
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#define MAP_32BIT 0 |
| 57 |
#endif |
| 58 |
#ifndef MAP_ANON |
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#define MAP_ANON 0 |
| 60 |
#endif |
| 61 |
#ifndef MAP_ANONYMOUS |
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#define MAP_ANONYMOUS 0 |
| 63 |
#endif |
| 64 |
|
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#define MAP_EXTRA_FLAGS (MAP_32BIT) |
| 66 |
|
| 67 |
#ifdef HAVE_MMAP_VM |
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#if defined(__linux__) && defined(__i386__) |
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/* Force a reasonnable address below 0x80000000 on x86 so that we |
| 70 |
don't get addresses above when the program is run on AMD64. |
| 71 |
NOTE: this is empirically determined on Linux/x86. */ |
| 72 |
#define MAP_BASE 0x10000000 |
| 73 |
#else |
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#define MAP_BASE 0x00000000 |
| 75 |
#endif |
| 76 |
static char * next_address = (char *)MAP_BASE; |
| 77 |
#ifdef HAVE_MMAP_ANON |
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#define map_flags (MAP_ANON | MAP_EXTRA_FLAGS) |
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#define zero_fd -1 |
| 80 |
#else |
| 81 |
#ifdef HAVE_MMAP_ANONYMOUS |
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#define map_flags (MAP_ANONYMOUS | MAP_EXTRA_FLAGS) |
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#define zero_fd -1 |
| 84 |
#else |
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#define map_flags (MAP_EXTRA_FLAGS) |
| 86 |
static int zero_fd = -1; |
| 87 |
#endif |
| 88 |
#endif |
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#endif |
| 90 |
|
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/* Utility functions for POSIX SHM handling. */ |
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|
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#ifdef USE_33BIT_ADDRESSING |
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struct shm_range_t { |
| 95 |
const char *file; |
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void *base; |
| 97 |
unsigned int size; |
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shm_range_t *next; |
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}; |
| 100 |
|
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static shm_range_t *shm_ranges = NULL; |
| 102 |
|
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static bool add_shm_range(const char *file, void *base, unsigned int size) |
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{ |
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shm_range_t *r = (shm_range_t *)malloc(sizeof(shm_range_t)); |
| 106 |
if (r) { |
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r->file = file; |
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r->base = base; |
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r->size = size; |
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r->next = shm_ranges ? shm_ranges : NULL; |
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shm_ranges = r; |
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return true; |
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} |
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return false; |
| 115 |
} |
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|
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static shm_range_t *find_shm_range(void *base, unsigned int size) |
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{ |
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for (shm_range_t *r = shm_ranges; r != NULL; r = r->next) |
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if (r->base == base && r->size == size) |
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return r; |
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return NULL; |
| 123 |
} |
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|
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static bool remove_shm_range(shm_range_t *r) |
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{ |
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if (r) { |
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for (shm_range_t *p = shm_ranges; p != NULL; p = p->next) { |
| 129 |
if (p->next == r) { |
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p->next = r->next; |
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free(r); |
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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|
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static bool remove_shm_range(void *base, unsigned int size) |
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{ |
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remove_shm_range(find_shm_range(base, size)); |
| 142 |
} |
| 143 |
#endif |
| 144 |
|
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/* Build a POSIX SHM memory segment file descriptor name. */ |
| 146 |
|
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#ifdef USE_33BIT_ADDRESSING |
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static const char *build_shm_filename(void) |
| 149 |
{ |
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static int id = 0; |
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static char filename[PATH_MAX]; |
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|
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int ret = snprintf(filename, sizeof(filename), "/BasiliskII-%d-shm-%d", getpid(), id); |
| 154 |
if (ret == -1 || ret >= sizeof(filename)) |
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return NULL; |
| 156 |
|
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id++; |
| 158 |
return filename; |
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} |
| 160 |
#endif |
| 161 |
|
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/* Translate generic VM map flags to host values. */ |
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|
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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 |= MAP_32BIT; |
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return flags; |
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} |
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#endif |
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|
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/* Align ADDR and SIZE to 64K boundaries. */ |
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|
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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)(((DWORD)addr) & -65536); |
| 186 |
} |
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|
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static inline DWORD align_size_segment(LPVOID addr, DWORD size) |
| 189 |
{ |
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return size + ((DWORD)addr - (DWORD)align_addr_segment(addr)); |
| 191 |
} |
| 192 |
#endif |
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|
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/* Translate generic VM prot flags to host values. */ |
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|
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#ifdef HAVE_WIN32_VM |
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static int translate_prot_flags(int prot_flags) |
| 198 |
{ |
| 199 |
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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|
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/* Initialize the VM system. Returns 0 if successful, -1 for errors. */ |
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|
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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); |
| 221 |
if (zero_fd < 0) |
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return -1; |
| 223 |
#endif |
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#endif |
| 225 |
return 0; |
| 226 |
} |
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|
| 228 |
/* Deallocate all internal data used to wrap virtual memory allocators. */ |
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|
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void vm_exit(void) |
| 231 |
{ |
| 232 |
#ifdef HAVE_MMAP_VM |
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#ifndef zero_fd |
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close(zero_fd); |
| 235 |
#endif |
| 236 |
#endif |
| 237 |
} |
| 238 |
|
| 239 |
/* Allocate zero-filled memory of SIZE bytes. The mapping is private |
| 240 |
and default protection bits are read / write. The return value |
| 241 |
is the actual mapping address chosen or VM_MAP_FAILED for errors. */ |
| 242 |
|
| 243 |
void * vm_acquire(size_t size, int options) |
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{ |
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void * addr; |
| 246 |
|
| 247 |
// VM_MAP_FIXED are to be used with vm_acquire_fixed() only |
| 248 |
if (options & VM_MAP_FIXED) |
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return VM_MAP_FAILED; |
| 250 |
|
| 251 |
#ifdef HAVE_MACH_VM |
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// vm_allocate() returns a zero-filled memory region |
| 253 |
if (vm_allocate(mach_task_self(), (vm_address_t *)&addr, size, TRUE) != KERN_SUCCESS) |
| 254 |
return VM_MAP_FAILED; |
| 255 |
#else |
| 256 |
#ifdef HAVE_MMAP_VM |
| 257 |
int fd = zero_fd; |
| 258 |
int the_map_flags = translate_map_flags(options) | map_flags; |
| 259 |
|
| 260 |
#ifdef USE_33BIT_ADDRESSING |
| 261 |
const char *shm_file = NULL; |
| 262 |
if (sizeof(void *) == 8 && (options & VM_MAP_33BIT)) { |
| 263 |
the_map_flags &= ~(MAP_PRIVATE | MAP_ANON | MAP_ANONYMOUS); |
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the_map_flags |= MAP_SHARED; |
| 265 |
|
| 266 |
if ((shm_file = build_shm_filename()) == NULL) |
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return VM_MAP_FAILED; |
| 268 |
|
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if ((fd = shm_open(shm_file, O_RDWR | O_CREAT | O_EXCL, 0644)) < 0) |
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return VM_MAP_FAILED; |
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|
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if (ftruncate(fd, size) < 0) |
| 273 |
return VM_MAP_FAILED; |
| 274 |
|
| 275 |
the_map_flags |= MAP_SHARED; |
| 276 |
} |
| 277 |
#endif |
| 278 |
|
| 279 |
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; |
| 281 |
|
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// Sanity checks for 64-bit platforms |
| 283 |
if (sizeof(void *) == 8 && (options & VM_MAP_32BIT) && !((char *)addr <= (char *)0xffffffff)) |
| 284 |
return VM_MAP_FAILED; |
| 285 |
|
| 286 |
next_address = (char *)addr + size; |
| 287 |
|
| 288 |
// Since I don't know the standard behavior of mmap(), zero-fill here |
| 289 |
if (memset(addr, 0, size) != addr) |
| 290 |
return VM_MAP_FAILED; |
| 291 |
|
| 292 |
// Remap to 33-bit space |
| 293 |
#ifdef USE_33BIT_ADDRESSING |
| 294 |
if (sizeof(void *) == 8 && (options & VM_MAP_33BIT)) { |
| 295 |
if (!add_shm_range(strdup(shm_file), addr, size)) |
| 296 |
return VM_MAP_FAILED; |
| 297 |
|
| 298 |
if (mmap((char *)addr + (1L << 32), size, VM_PAGE_DEFAULT, the_map_flags | MAP_FIXED, fd, 0) == (void *)MAP_FAILED) |
| 299 |
return VM_MAP_FAILED; |
| 300 |
close(fd); |
| 301 |
} |
| 302 |
#endif |
| 303 |
#else |
| 304 |
#ifdef HAVE_WIN32_VM |
| 305 |
if ((addr = VirtualAlloc(NULL, size, MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE)) == NULL) |
| 306 |
return VM_MAP_FAILED; |
| 307 |
|
| 308 |
// Zero newly allocated memory |
| 309 |
if (memset(addr, 0, size) != addr) |
| 310 |
return VM_MAP_FAILED; |
| 311 |
#else |
| 312 |
if ((addr = calloc(size, 1)) == 0) |
| 313 |
return VM_MAP_FAILED; |
| 314 |
|
| 315 |
// Omit changes for protections because they are not supported in this mode |
| 316 |
return addr; |
| 317 |
#endif |
| 318 |
#endif |
| 319 |
#endif |
| 320 |
|
| 321 |
// Explicitely protect the newly mapped region here because on some systems, |
| 322 |
// say MacOS X, mmap() doesn't honour the requested protection flags. |
| 323 |
if (vm_protect(addr, size, VM_PAGE_DEFAULT) != 0) |
| 324 |
return VM_MAP_FAILED; |
| 325 |
|
| 326 |
return addr; |
| 327 |
} |
| 328 |
|
| 329 |
/* Allocate zero-filled memory at exactly ADDR (which must be page-aligned). |
| 330 |
Retuns 0 if successful, -1 on errors. */ |
| 331 |
|
| 332 |
int vm_acquire_fixed(void * addr, size_t size, int options) |
| 333 |
{ |
| 334 |
// Fixed mappings are required to be private |
| 335 |
if (options & VM_MAP_SHARED) |
| 336 |
return -1; |
| 337 |
|
| 338 |
#ifdef HAVE_MACH_VM |
| 339 |
// vm_allocate() returns a zero-filled memory region |
| 340 |
if (vm_allocate(mach_task_self(), (vm_address_t *)&addr, size, 0) != KERN_SUCCESS) |
| 341 |
return -1; |
| 342 |
#else |
| 343 |
#ifdef HAVE_MMAP_VM |
| 344 |
const int extra_map_flags = translate_map_flags(options); |
| 345 |
|
| 346 |
if (mmap((caddr_t)addr, size, VM_PAGE_DEFAULT, extra_map_flags | map_flags | MAP_FIXED, zero_fd, 0) == (void *)MAP_FAILED) |
| 347 |
return -1; |
| 348 |
|
| 349 |
// Since I don't know the standard behavior of mmap(), zero-fill here |
| 350 |
if (memset(addr, 0, size) != addr) |
| 351 |
return -1; |
| 352 |
#else |
| 353 |
#ifdef HAVE_WIN32_VM |
| 354 |
// Windows cannot allocate Low Memory |
| 355 |
if (addr == NULL) |
| 356 |
return -1; |
| 357 |
|
| 358 |
// Allocate a possibly offset region to align on 64K boundaries |
| 359 |
LPVOID req_addr = align_addr_segment(addr); |
| 360 |
DWORD req_size = align_size_segment(addr, size); |
| 361 |
LPVOID ret_addr = VirtualAlloc(req_addr, req_size, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE); |
| 362 |
if (ret_addr != req_addr) |
| 363 |
return -1; |
| 364 |
|
| 365 |
// Zero newly allocated memory |
| 366 |
if (memset(addr, 0, size) != addr) |
| 367 |
return -1; |
| 368 |
#else |
| 369 |
// Unsupported |
| 370 |
return -1; |
| 371 |
#endif |
| 372 |
#endif |
| 373 |
#endif |
| 374 |
|
| 375 |
// Explicitely protect the newly mapped region here because on some systems, |
| 376 |
// say MacOS X, mmap() doesn't honour the requested protection flags. |
| 377 |
if (vm_protect(addr, size, VM_PAGE_DEFAULT) != 0) |
| 378 |
return -1; |
| 379 |
|
| 380 |
return 0; |
| 381 |
} |
| 382 |
|
| 383 |
/* Deallocate any mapping for the region starting at ADDR and extending |
| 384 |
LEN bytes. Returns 0 if successful, -1 on errors. */ |
| 385 |
|
| 386 |
int vm_release(void * addr, size_t size) |
| 387 |
{ |
| 388 |
// Safety check: don't try to release memory that was not allocated |
| 389 |
if (addr == VM_MAP_FAILED) |
| 390 |
return 0; |
| 391 |
|
| 392 |
#ifdef HAVE_MACH_VM |
| 393 |
if (vm_deallocate(mach_task_self(), (vm_address_t)addr, size) != KERN_SUCCESS) |
| 394 |
return -1; |
| 395 |
#else |
| 396 |
#ifdef HAVE_MMAP_VM |
| 397 |
if (munmap((caddr_t)addr, size) != 0) |
| 398 |
return -1; |
| 399 |
|
| 400 |
#ifdef USE_33BIT_ADDRESSING |
| 401 |
shm_range_t *r = find_shm_range(addr, size); |
| 402 |
if (r) { |
| 403 |
if (munmap((char *)r->base + (1L << 32), size) != 0) |
| 404 |
return -1; |
| 405 |
|
| 406 |
if (shm_unlink(r->file) < 0) |
| 407 |
return -1; |
| 408 |
free((char *)r->file); |
| 409 |
|
| 410 |
if (!remove_shm_range(r)) |
| 411 |
return -1; |
| 412 |
} |
| 413 |
#endif |
| 414 |
#else |
| 415 |
#ifdef HAVE_WIN32_VM |
| 416 |
if (VirtualFree(align_addr_segment(addr), 0, MEM_RELEASE) == 0) |
| 417 |
return -1; |
| 418 |
#else |
| 419 |
free(addr); |
| 420 |
#endif |
| 421 |
#endif |
| 422 |
#endif |
| 423 |
|
| 424 |
return 0; |
| 425 |
} |
| 426 |
|
| 427 |
/* Change the memory protection of the region starting at ADDR and |
| 428 |
extending LEN bytes to PROT. Returns 0 if successful, -1 for errors. */ |
| 429 |
|
| 430 |
int vm_protect(void * addr, size_t size, int prot) |
| 431 |
{ |
| 432 |
#ifdef HAVE_MACH_VM |
| 433 |
int ret_code = vm_protect(mach_task_self(), (vm_address_t)addr, size, 0, prot); |
| 434 |
return ret_code == KERN_SUCCESS ? 0 : -1; |
| 435 |
#else |
| 436 |
#ifdef HAVE_MMAP_VM |
| 437 |
int ret_code = mprotect((caddr_t)addr, size, prot); |
| 438 |
return ret_code == 0 ? 0 : -1; |
| 439 |
#else |
| 440 |
#ifdef HAVE_WIN32_VM |
| 441 |
DWORD old_prot; |
| 442 |
int ret_code = VirtualProtect(addr, size, translate_prot_flags(prot), &old_prot); |
| 443 |
return ret_code != 0 ? 0 : -1; |
| 444 |
#else |
| 445 |
// Unsupported |
| 446 |
return -1; |
| 447 |
#endif |
| 448 |
#endif |
| 449 |
#endif |
| 450 |
} |
| 451 |
|
| 452 |
/* Returns the size of a page. */ |
| 453 |
|
| 454 |
int vm_page_size(void) |
| 455 |
{ |
| 456 |
#ifdef _WIN32 |
| 457 |
return 4096; |
| 458 |
#else |
| 459 |
return getpagesize(); |
| 460 |
#endif |
| 461 |
} |
| 462 |
|
| 463 |
#ifdef CONFIGURE_TEST_VM_MAP |
| 464 |
/* Tests covered here: |
| 465 |
- TEST_VM_PROT_* program slices actually succeeds when a crash occurs |
| 466 |
- TEST_VM_MAP_ANON* program slices succeeds when it could be compiled |
| 467 |
*/ |
| 468 |
int main(void) |
| 469 |
{ |
| 470 |
vm_init(); |
| 471 |
|
| 472 |
#define page_align(address) ((char *)((unsigned long)(address) & -page_size)) |
| 473 |
unsigned long page_size = vm_page_size(); |
| 474 |
|
| 475 |
const int area_size = 6 * page_size; |
| 476 |
volatile char * area = (volatile char *) vm_acquire(area_size); |
| 477 |
volatile char * fault_address = area + (page_size * 7) / 2; |
| 478 |
|
| 479 |
#if defined(TEST_VM_MMAP_ANON) || defined(TEST_VM_MMAP_ANONYMOUS) |
| 480 |
if (area == VM_MAP_FAILED) |
| 481 |
return 1; |
| 482 |
|
| 483 |
if (vm_release((char *)area, area_size) < 0) |
| 484 |
return 1; |
| 485 |
|
| 486 |
return 0; |
| 487 |
#endif |
| 488 |
|
| 489 |
#if defined(TEST_VM_PROT_NONE_READ) || defined(TEST_VM_PROT_NONE_WRITE) |
| 490 |
if (area == VM_MAP_FAILED) |
| 491 |
return 0; |
| 492 |
|
| 493 |
if (vm_protect(page_align(fault_address), page_size, VM_PAGE_NOACCESS) < 0) |
| 494 |
return 0; |
| 495 |
#endif |
| 496 |
|
| 497 |
#if defined(TEST_VM_PROT_RDWR_WRITE) |
| 498 |
if (area == VM_MAP_FAILED) |
| 499 |
return 1; |
| 500 |
|
| 501 |
if (vm_protect(page_align(fault_address), page_size, VM_PAGE_READ) < 0) |
| 502 |
return 1; |
| 503 |
|
| 504 |
if (vm_protect(page_align(fault_address), page_size, VM_PAGE_READ | VM_PAGE_WRITE) < 0) |
| 505 |
return 1; |
| 506 |
#endif |
| 507 |
|
| 508 |
#if defined(TEST_VM_PROT_READ_WRITE) |
| 509 |
if (vm_protect(page_align(fault_address), page_size, VM_PAGE_READ) < 0) |
| 510 |
return 0; |
| 511 |
#endif |
| 512 |
|
| 513 |
#if defined(TEST_VM_PROT_NONE_READ) |
| 514 |
// this should cause a core dump |
| 515 |
char foo = *fault_address; |
| 516 |
return 0; |
| 517 |
#endif |
| 518 |
|
| 519 |
#if defined(TEST_VM_PROT_NONE_WRITE) || defined(TEST_VM_PROT_READ_WRITE) |
| 520 |
// this should cause a core dump |
| 521 |
*fault_address = 'z'; |
| 522 |
return 0; |
| 523 |
#endif |
| 524 |
|
| 525 |
#if defined(TEST_VM_PROT_RDWR_WRITE) |
| 526 |
// this should not cause a core dump |
| 527 |
*fault_address = 'z'; |
| 528 |
return 0; |
| 529 |
#endif |
| 530 |
} |
| 531 |
#endif |
