diff options
Diffstat (limited to 'sys/uvm')
| -rw-r--r-- | sys/uvm/uvm_mmap.c | 87 |
1 files changed, 84 insertions, 3 deletions
diff --git a/sys/uvm/uvm_mmap.c b/sys/uvm/uvm_mmap.c index 5da4bf71caa..728f10e4eb1 100644 --- a/sys/uvm/uvm_mmap.c +++ b/sys/uvm/uvm_mmap.c @@ -1,4 +1,4 @@ -/* $OpenBSD: uvm_mmap.c,v 1.44 2003/04/25 20:32:07 drahn Exp $ */ +/* $OpenBSD: uvm_mmap.c,v 1.45 2003/04/28 21:32:08 drahn Exp $ */ /* $NetBSD: uvm_mmap.c,v 1.49 2001/02/18 21:19:08 chs Exp $ */ /* @@ -127,11 +127,92 @@ sys_sstk(p, v, retval) * off: offset within the file */ -/* ARGSUSED */ int -sys_mquery(struct proc *p, void *v, register_t *retval) +sys_mquery(p, v, retval) + struct proc *p; + void *v; + register_t *retval; { struct sys_mquery_args /* { + syscallarg(caddr_t) addr; + syscallarg(size_t) len; + syscallarg(int) prot; + syscallarg(int) flags; + syscallarg(int) fd; + syscallarg(long) pad; + syscallarg(off_t) pos; + } */ *uap = v; + struct file *fp; + struct uvm_object *uobj; + voff_t uoff; + int error; + vaddr_t vaddr; + int flags = 0; + vsize_t size; + vm_prot_t prot; + int fd; + + vaddr = (vaddr_t) SCARG(uap, addr); + prot = SCARG(uap, prot) & VM_PROT_ALL; + size = (vsize_t) SCARG(uap, len); + fd = SCARG(uap, fd); + + if (SCARG(uap, flags) & MAP_FIXED) + flags |= UVM_FLAG_FIXED; + + if (fd >= 0) { + if ((error = getvnode(p->p_fd, fd, &fp)) != 0) + return (error); + uobj = &((struct vnode *)fp->f_data)->v_uvm.u_obj; + uoff = SCARG(uap, pos); + } else { + fp = NULL; + uobj = NULL; + uoff = 0; + } + + if (vaddr == 0) + vaddr = uvm_map_hint(p, prot); + + /* prevent a user requested address from falling in heap space */ + if ((vaddr + size > (vaddr_t)p->p_vmspace->vm_daddr) && + (vaddr < (vaddr_t)p->p_vmspace->vm_daddr + MAXDSIZ)) { + if (flags & UVM_FLAG_FIXED) { + error = EINVAL; + goto done; + } + vaddr = round_page((vaddr_t)p->p_vmspace->vm_daddr + MAXDSIZ); + } +again: + + if (uvm_map_findspace(&p->p_vmspace->vm_map, vaddr, size, + &vaddr, uobj, uoff, 0, flags) == NULL) { + if (flags & UVM_FLAG_FIXED) + error = EINVAL; + else + error = ENOMEM; + } else { + /* prevent a returned address from falling in heap space */ + if ((vaddr + size > (vaddr_t)p->p_vmspace->vm_daddr) + && (vaddr < (vaddr_t)p->p_vmspace->vm_daddr + MAXDSIZ)) { + vaddr = round_page((vaddr_t)p->p_vmspace->vm_daddr + + MAXDSIZ); + goto again; + } + error = 0; + *retval = (register_t)(vaddr); + } +done: + if (fp != NULL) + FRELE(fp); + return (error); +} + +/* ARGSUSED */ +int +sys_omquery(struct proc *p, void *v, register_t *retval) +{ + struct sys_omquery_args /* { syscallarg(int) flags; syscallarg(void **) addr; syscallarg(size_t) size; |