diff options
Diffstat (limited to 'sys/vm/vm_mmap.c')
| -rw-r--r-- | sys/vm/vm_mmap.c | 204 |
1 files changed, 177 insertions, 27 deletions
diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c index 697baf6..ff0e79c 100644 --- a/sys/vm/vm_mmap.c +++ b/sys/vm/vm_mmap.c @@ -38,7 +38,7 @@ * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$ * * @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94 - * $Id: vm_mmap.c,v 1.43 1996/05/19 07:36:49 dyson Exp $ + * $Id: vm_mmap.c,v 1.44 1996/05/31 00:38:00 dyson Exp $ */ /* @@ -72,6 +72,7 @@ #include <vm/vm_extern.h> #include <vm/vm_kern.h> #include <vm/vm_page.h> +#include <vm/loadaout.h> #ifndef _SYS_SYSPROTO_H_ struct sbrk_args { @@ -689,10 +690,10 @@ mincore(p, uap, retval) if (m) { mincoreinfo = MINCORE_INCORE; if (m->dirty || - pmap_is_modified(VM_PAGE_TO_PHYS(m))) + pmap_tc_modified(m)) mincoreinfo |= MINCORE_MODIFIED_OTHER; if ((m->flags & PG_REFERENCED) || - pmap_is_referenced(VM_PAGE_TO_PHYS(m))) + pmap_tc_referenced(VM_PAGE_TO_PHYS(m))) mincoreinfo |= MINCORE_REFERENCED_OTHER; } } @@ -844,7 +845,7 @@ vm_mmap(map, addr, size, prot, maxprot, flags, handle, foff) vm_ooffset_t foff; { boolean_t fitit; - vm_object_t object, object2; + vm_object_t object; struct vnode *vp = NULL; objtype_t type; int rv = KERN_SUCCESS; @@ -916,29 +917,13 @@ vm_mmap(map, addr, size, prot, maxprot, flags, handle, foff) flags |= MAP_SHARED; } - object2 = NULL; docow = 0; if ((flags & (MAP_ANON|MAP_SHARED)) == 0) { - docow = MAP_COPY_ON_WRITE; - if (objsize < size) { - object2 = vm_object_allocate( OBJT_DEFAULT, - OFF_TO_IDX(size - (foff & ~PAGE_MASK))); - object2->backing_object = object; - object2->backing_object_offset = foff; - TAILQ_INSERT_TAIL(&object->shadow_head, - object2, shadow_list); - ++object->shadow_count; - } else { - docow |= MAP_COPY_NEEDED; - } + docow = MAP_COPY_ON_WRITE|MAP_COPY_NEEDED; } - if (object2) - rv = vm_map_find(map, object2, 0, addr, size, fitit, - prot, maxprot, docow); - else - rv = vm_map_find(map, object, foff, addr, size, fitit, - prot, maxprot, docow); + rv = vm_map_find(map, object, foff, addr, size, fitit, + prot, maxprot, docow); if (rv != KERN_SUCCESS) { @@ -947,10 +932,7 @@ vm_mmap(map, addr, size, prot, maxprot, flags, handle, foff) * object if it's an unnamed anonymous mapping * or named anonymous without other references. */ - if (object2) - vm_object_deallocate(object2); - else - vm_object_deallocate(object); + vm_object_deallocate(object); goto out; } @@ -985,3 +967,171 @@ out: return (EINVAL); } } + +#ifdef notyet +/* + * Efficient mapping of a .text+.data+.bss object + */ +int +vm_mapaout(map, baseaddr, vp, foff, textsize, datasize, bsssize, addr) + vm_map_t map; + vm_offset_t baseaddr; + struct vnode *vp; + vm_ooffset_t foff; + register vm_size_t textsize, datasize, bsssize; + vm_offset_t *addr; +{ + vm_object_t object; + int rv; + vm_pindex_t objpsize; + struct proc *p = curproc; + + vm_size_t totalsize; + vm_size_t textend; + struct vattr vat; + int error; + + textsize = round_page(textsize); + datasize = round_page(datasize); + bsssize = round_page(bsssize); + totalsize = textsize + datasize + bsssize; + + vm_map_lock(map); + /* + * If baseaddr == -1, then we need to search for space. Otherwise, + * we need to be loaded into a certain spot. + */ + if (baseaddr != (vm_offset_t) -1) { + if (vm_map_findspace(map, baseaddr, totalsize, addr)) { + goto outnomem; + } + + if(*addr != baseaddr) { + goto outnomem; + } + } else { + baseaddr = round_page(p->p_vmspace->vm_daddr + MAXDSIZ); + if (vm_map_findspace(map, baseaddr, totalsize, addr)) { + goto outnomem; + } + } + + if (foff & PAGE_MASK) { + vm_map_unlock(map); + return EINVAL; + } + + /* + * get the object size to allocate + */ + error = VOP_GETATTR(vp, &vat, p->p_ucred, p); + if (error) { + vm_map_unlock(map); + return error; + } + objpsize = OFF_TO_IDX(round_page(vat.va_size)); + + /* + * Alloc/reference the object + */ + object = vm_pager_allocate(OBJT_VNODE, vp, + objpsize, VM_PROT_ALL, foff); + if (object == NULL) { + goto outnomem; + } + + /* + * Insert .text into the map + */ + textend = *addr + textsize; + rv = vm_map_insert(map, object, foff, + *addr, textend, + VM_PROT_READ|VM_PROT_EXECUTE, VM_PROT_ALL, + MAP_COPY_ON_WRITE|MAP_COPY_NEEDED); + if (rv != KERN_SUCCESS) { + vm_object_deallocate(object); + goto out; + } + + /* + * Insert .data into the map, if there is any to map. + */ + if (datasize != 0) { + object->ref_count++; + rv = vm_map_insert(map, object, foff + textsize, + textend, textend + datasize, + VM_PROT_ALL, VM_PROT_ALL, + MAP_COPY_ON_WRITE|MAP_COPY_NEEDED); + if (rv != KERN_SUCCESS) { + --object->ref_count; + vm_map_delete(map, *addr, textend); + goto out; + } + } + + /* + * Preload the page tables + */ + pmap_object_init_pt(map->pmap, *addr, + object, (vm_pindex_t) OFF_TO_IDX(foff), + textsize + datasize, 1); + + /* + * Get the space for bss. + */ + if (bsssize != 0) { + rv = vm_map_insert(map, NULL, 0, + textend + datasize, + *addr + totalsize, + VM_PROT_ALL, VM_PROT_ALL, 0); + } + if (rv != KERN_SUCCESS) { + vm_map_delete(map, *addr, textend + datasize + bsssize); + } + +out: + vm_map_unlock(map); + switch (rv) { + case KERN_SUCCESS: + return 0; + case KERN_INVALID_ADDRESS: + case KERN_NO_SPACE: + return ENOMEM; + case KERN_PROTECTION_FAILURE: + return EACCES; + default: + return EINVAL; + } +outnomem: + vm_map_unlock(map); + return ENOMEM; +} + + +int +mapaout(struct proc *p, struct mapaout_args *uap, int *retval) +{ + + register struct filedesc *fdp = p->p_fd; + struct file *fp; + struct vnode *vp; + int rtval; + + if (((unsigned) uap->fd) >= fdp->fd_nfiles || + (fp = fdp->fd_ofiles[uap->fd]) == NULL) + return (EBADF); + if (fp->f_type != DTYPE_VNODE) + return (EINVAL); + + vp = (struct vnode *) fp->f_data; + if ((vp->v_type != VREG) && (vp->v_type != VCHR)) + return (EINVAL); + + rtval = vm_mapaout( &p->p_vmspace->vm_map, + uap->addr, vp, uap->offset, + uap->textsize, uap->datasize, uap->bsssize, + (vm_offset_t *)retval); + + return rtval; +} +#endif |
