1/* 2 * Copyright (c) 2001 Daniel Eischen <deischen@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Neither the name of the author nor the names of its contributors 11 * may be used to endorse or promote products derived from this software 12 * without specific prior written permission. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <machine/asm.h> 28/* 29 * _ctx_start((void *func)(int arg1, ..., argn), 30 * int arg1, ..., argn, ucontext_t *ucp) 31 * 32 * 0(%esp) - func 33 * 4(%esp) - arg1 34 * 8(%esp) - arg2 35 * ... 36 * (4*n)(%esp) - argn 37 * (4*(n + 1))(%esp) - ucp, %ebp setup to point here (base of stack) 38 */ 39ENTRY(_ctx_start) 40 popl %eax /* get start function */ 41 call *%eax /* call start function */ 42 PIC_PROLOGUE 43 movl %esi, %esp /* 44 * setup stack for completion routine; 45 * ucp is now at top of stack 46 */ 47 call PIC_PLT(_ctx_done) /* should never return */ 48 call PIC_PLT(abort) /* fubar */ 49 ret 50END(_ctx_start) 51 52 .section .note.GNU-stack,"",%progbits 53