diff options
Diffstat (limited to 'usr/src/lib/crt/i386/mach-crt1.s')
| -rw-r--r-- | usr/src/lib/crt/i386/mach-crt1.s | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/usr/src/lib/crt/i386/mach-crt1.s b/usr/src/lib/crt/i386/mach-crt1.s new file mode 100644 index 0000000000..1824d41ec3 --- /dev/null +++ b/usr/src/lib/crt/i386/mach-crt1.s @@ -0,0 +1,80 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + +/* + * Copyright 2009 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ +#include <sys/asm_linkage.h> + + .file "mach-crt1.s" + +/* global entities defined elsewhere but used here */ + .globl _start_crt + +/* + * C language startup routine. + * Assume that exec code has cleared the direction flag in the TSS. + * Assume that %esp is set to the addr after the last word pushed. + * The stack contains (in order): argc, argv[],envp[],... + * Assume that all of the segment registers are initialized. + * + * Allocate a NULL return address and a NULL previous %ebp as if + * there was a genuine call to _start. + * debugger stack trace shows _start(argc,argv[0],argv[1],...,envp[0],...) + */ +ENTRY_NP(_start) + pushl $0 + pushl $0 + movl %esp,%ebp /* The first stack frame */ + + /* + * The stack needs to be 16-byte aligned with a 4-byte bias. See + * comment in lib/libc/i386/gen/makectxt.c. + * + * Note: If you change it, you need to change it in the following + * files as well: + * + * - lib/libc/i386/threads/machdep.c + * - lib/libc/i386/gen/makectxt.c + * - lib/crt/i386/crti.s + */ + andl $-16,%esp /* make main() and exit() be called with */ + subl $4,%esp /* a properly aligned stack pointer */ + pushl %edx /* possible atexit handler */ + leal 12(%ebp),%edx /* argv */ + movl 8(%ebp),%eax /* argc */ + pushl %edx + pushl %eax + call _start_crt + hlt +SET_SIZE(_start) + +#include "fsr.s" + +/* + * The following is here in case any object module compiled with cc -p + * was linked into this module. + */ +ENTRY_NP(_mcount) + .weak _mcount + ret +SET_SIZE(_mcount) |