_ctx_start.S revision 131460
1243789Sdim/* 2243789Sdim * Copyright (c) 2001 Daniel Eischen <deischen@freebsd.org> 3243789Sdim * All rights reserved. 4243789Sdim * 5243789Sdim * Redistribution and use in source and binary forms, with or without 6243789Sdim * modification, are permitted provided that the following conditions 7243789Sdim * are met: 8243789Sdim * 1. Redistributions of source code must retain the above copyright 9243789Sdim * notice, this list of conditions and the following disclaimer. 10243789Sdim * 2. Neither the name of the author nor the names of its contributors 11243789Sdim * may be used to endorse or promote products derived from this software 12243789Sdim * without specific prior written permission. 13243789Sdim * 14243789Sdim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15243789Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16243789Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17243789Sdim * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18249423Sdim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19243789Sdim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20243789Sdim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21243789Sdim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22243789Sdim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23243789Sdim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24243789Sdim * SUCH DAMAGE. 25243789Sdim */ 26243789Sdim 27243789Sdim#include <machine/asm.h> 28243789Sdim__FBSDID("$FreeBSD: head/lib/libc/i386/gen/_ctx_start.S 131460 2004-07-02 14:19:44Z davidxu $"); 29243789Sdim 30243789Sdim/* 31243789Sdim * _ctx_start((void *func)(int arg1, ..., argn), 32243789Sdim * int arg1, ..., argn, ucontext_t *ucp) 33243789Sdim * 34243789Sdim * 0(%esp) - func 35243789Sdim * 4(%esp) - arg1 36243789Sdim * 8(%esp) - arg2 37243789Sdim * ... 38243789Sdim * (4*n)(%esp) - argn 39243789Sdim * (4*(n + 1))(%esp) - ucp, %ebp setup to point here (base of stack) 40243789Sdim */ 41243789SdimENTRY(_ctx_start) 42243789Sdim popl %eax /* get start function */ 43243789Sdim call *%eax /* call start function */ 44263508Sdim movl %esi, %esp /* 45263508Sdim * setup stack for completion routine; 46263508Sdim * ucp is now at top of stack 47243789Sdim */ 48243789Sdim call _ctx_done /* should never return */ 49243789Sdim call abort /* fubar */ 50243789Sdim ret 51243789Sdim