215850cc69
File Revisions kern/imgact_aout.c 1.100 kern/imgact_elf.c 1.167-1.172, 1.175 kern/imgact_gzip.c 1.55 vm/vm_extern.h 1.77 vm/vm_glue.c 1.214 Use sf_buf_alloc() instead of vm_map_find() on exec_map to create the ephemeral mappings that are used as the source for three copy operations from kernel space to user space. There are two reasons for making this change: (1) Under heavy load exec_map can fill up causing vm_map_find() to fail. When it fails, the nascent process is aborted (SIGABRT). Whereas, this reimplementation using sf_buf_alloc() sleeps. (2) Although it is possible to sleep on vm_map_find()'s failure until address space becomes available (see kmem_alloc_wait()), using sf_buf_alloc() is faster. Furthermore, the reimplementation uses a CPU private mapping, avoiding a TLB shootdown on multiprocessors. The second argument to vm_map_find() should be NULL instead of 0. Correct a long-standing problem in elfN_map_insert(): In order to copy a page to user space, the user space mapping must allow write access. Eliminate an unneeded (vm_prot_t) parameter from two functions. Eliminate unnecessary uses of a local variable. Maintain the vnode lock throughout elfN_load_file() rather than releasing it and reacquiring it in vrele(). Consequently, there is no reason to increase the reference count on the vm object caching the file's pages. Eliminate unused parameters to elfN_load_file(). Maintain the lock on the vnode for most of exec_elfN_imgact(). Specifically, it is required for the I/O that may be performed by elfN_load_section(). Avoid an obscure deadlock in the a.out, elf, and gzip image activators. Add a comment describing why the deadlock does not occur in the common case and how it might occur in less usual circumstances. Eliminate an unused variable from exec_aout_imgact(). Avoid a vm object reference leak in a rarely used code path. An executable contains at most one PT_INTERP program header. Therefore, the loop that searches for it can terminate after it is found rather than iterating over the entire set of program headers. Eliminate an unneeded initialization. Approved by: re (mux)
99 lines
4.2 KiB
C
99 lines
4.2 KiB
C
/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vm_extern.h 8.2 (Berkeley) 1/12/94
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* $FreeBSD$
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*/
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#ifndef _VM_EXTERN_H_
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#define _VM_EXTERN_H_
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struct buf;
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struct proc;
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struct vmspace;
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struct vmtotal;
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struct mount;
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struct vnode;
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#ifdef _KERNEL
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#ifdef TYPEDEF_FOR_UAP
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int getpagesize(struct thread *, void *, int *);
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int madvise(struct thread *, void *, int *);
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int mincore(struct thread *, void *, int *);
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int mprotect(struct thread *, void *, int *);
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int msync(struct thread *, void *, int *);
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int munmap(struct thread *, void *, int *);
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int obreak(struct thread *, void *, int *);
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int sbrk(struct thread *, void *, int *);
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int sstk(struct thread *, void *, int *);
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int swapon(struct thread *, void *, int *);
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#endif /* TYPEDEF_FOR_UAP */
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int kernacc(void *, int, int);
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vm_offset_t kmem_alloc(vm_map_t, vm_size_t);
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vm_offset_t kmem_alloc_nofault(vm_map_t, vm_size_t);
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vm_offset_t kmem_alloc_wait(vm_map_t, vm_size_t);
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void kmem_free(vm_map_t, vm_offset_t, vm_size_t);
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void kmem_free_wakeup(vm_map_t, vm_offset_t, vm_size_t);
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void kmem_init(vm_offset_t, vm_offset_t);
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vm_offset_t kmem_malloc(vm_map_t, vm_size_t, boolean_t);
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vm_map_t kmem_suballoc(vm_map_t, vm_offset_t *, vm_offset_t *, vm_size_t);
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void swapout_procs(int);
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int useracc(void *, int, int);
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int vm_fault(vm_map_t, vm_offset_t, vm_prot_t, int);
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void vm_fault_copy_entry(vm_map_t, vm_map_t, vm_map_entry_t, vm_map_entry_t);
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void vm_fault_unwire(vm_map_t, vm_offset_t, vm_offset_t, boolean_t);
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int vm_fault_wire(vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
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void vm_forkproc(struct thread *, struct proc *, struct thread *, int);
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void vm_waitproc(struct proc *);
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int vm_mmap(vm_map_t, vm_offset_t *, vm_size_t, vm_prot_t, vm_prot_t, int, objtype_t, void *, vm_ooffset_t);
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void vm_set_page_size(void);
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struct vmspace *vmspace_alloc(vm_offset_t, vm_offset_t);
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struct vmspace *vmspace_fork(struct vmspace *);
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void vmspace_exec(struct proc *, vm_offset_t, vm_offset_t);
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void vmspace_unshare(struct proc *);
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void vmspace_free(struct vmspace *);
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void vmspace_exitfree(struct proc *);
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void vnode_pager_setsize(struct vnode *, vm_ooffset_t);
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int vslock(void *, size_t);
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void vsunlock(void *, size_t);
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void vm_object_print(/* db_expr_t */ long, boolean_t, /* db_expr_t */ long,
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char *);
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int vm_fault_quick(caddr_t v, int prot);
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struct sf_buf *vm_imgact_map_page(vm_object_t object, vm_ooffset_t offset);
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void vm_imgact_unmap_page(struct sf_buf *sf);
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void vm_thread_dispose(struct thread *td);
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void vm_thread_dispose_altkstack(struct thread *td);
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void vm_thread_new(struct thread *td, int pages);
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void vm_thread_new_altkstack(struct thread *td, int pages);
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void vm_thread_swapin(struct thread *td);
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void vm_thread_swapout(struct thread *td);
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#endif /* _KERNEL */
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#endif /* !_VM_EXTERN_H_ */
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