diff options
Diffstat (limited to 'sys/vm/vm_mmap.c')
| -rw-r--r-- | sys/vm/vm_mmap.c | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c index 77f64f4..9548485 100644 --- a/sys/vm/vm_mmap.c +++ b/sys/vm/vm_mmap.c @@ -94,10 +94,8 @@ SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RW | CTLFLAG_TUN, &old_mlock, 0, "Do not apply RLIMIT_MEMLOCK on mlockall"); TUNABLE_INT("vm.old_mlock", &old_mlock); -#ifndef _SYS_SYSPROTO_H_ -struct sbrk_args { - int incr; -}; +#ifdef MAP_32BIT +#define MAP_32BIT_MAX_ADDR ((vm_offset_t)1 << 31) #endif static int vm_mmap_vnode(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *, @@ -107,6 +105,12 @@ static int vm_mmap_cdev(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *, static int vm_mmap_shm(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *, int *, struct shmfd *, vm_ooffset_t, vm_object_t *); +#ifndef _SYS_SYSPROTO_H_ +struct sbrk_args { + int incr; +}; +#endif + /* * MPSAFE */ @@ -278,6 +282,18 @@ sys_mmap(td, uap) return (EINVAL); if (addr + size < addr) return (EINVAL); +#ifdef MAP_32BIT + if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR) + return (EINVAL); + } else if (flags & MAP_32BIT) { + /* + * For MAP_32BIT, override the hint if it is too high and + * do not bother moving the mapping past the heap (since + * the heap is usually above 2GB). + */ + if (addr + size > MAP_32BIT_MAX_ADDR) + addr = 0; +#endif } else { /* * XXX for non-fixed mappings where no hint is provided or @@ -1620,8 +1636,11 @@ vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, MAP_ALIGNMENT_SHIFT); else findspace = VMFS_OPTIMAL_SPACE; - rv = vm_map_find(map, object, foff, addr, size, findspace, - prot, maxprot, docow); + rv = vm_map_find(map, object, foff, addr, size, +#ifdef MAP_32BIT + flags & MAP_32BIT ? MAP_32BIT_MAX_ADDR : +#endif + 0, findspace, prot, maxprot, docow); } else rv = vm_map_fixed(map, object, foff, *addr, size, prot, maxprot, docow); |
