xref: /titanic_50/usr/src/lib/libc/i386/crt/_rtboot.s (revision 4f680cc668fa6cf678c531083400ade9a9c7934c)
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26	.file	"_rtboot.s"
27
28/ bootstrap routine for run-time linker
29/ we get control from exec which has loaded our text and
30/ data into the process' address space and created the process
31/ stack
32/
33/ on entry, the process stack looks like this:
34/
35/			# <- %esp
36/_______________________#  high addresses
37/	strings		#
38/_______________________#
39/	0 word		#
40/_______________________#
41/	Auxiliary	#
42/	entries		#
43/	...		#
44/	(size varies)	#
45/_______________________#
46/	0 word		#
47/_______________________#
48/	Environment	#
49/	pointers	#
50/	...		#
51/	(one word each)	#
52/_______________________#
53/	0 word		#
54/_______________________#
55/	Argument	# low addresses
56/	pointers	#
57/	Argc words	#
58/_______________________#
59/	argc		#
60/_______________________# <- %ebp
61
62#include <SYS.h>
63
64	.set	EB_NULL,0
65	.set	EB_DYNAMIC,1
66	.set	EB_LDSO_BASE,2
67	.set	EB_ARGV,3
68	.set	EB_ENVP,4
69	.set	EB_AUXV,5
70	.set	EB_DEVZERO,6
71	.set	EB_PAGESIZE,7
72	.set	EB_MAX,8
73	.set	EB_MAX_SIZE32,64
74
75	.text
76	.globl	__rtboot
77	.globl	__rtld
78	.type	__rtboot,@function
79	.align	4
80__rtboot:
81	movl	%esp,%ebp
82	subl	$EB_MAX_SIZE32,%esp	/ make room for a max sized boot vector
83	movl	%esp,%esi		/ use esi as a pointer to &eb[0]
84	movl	$EB_ARGV,0(%esi)	/ set up tag for argv
85	leal	4(%ebp),%eax		/ get address of argv
86	movl	%eax,4(%esi)		/ put after tag
87	movl	$EB_ENVP,8(%esi)	/ set up tag for envp
88	movl	(%ebp),%eax		/ get # of args
89	addl	$2,%eax			/ one for the zero & one for argc
90	leal	(%ebp,%eax,4),%edi	/ now points past args & @ envp
91	movl	%edi,12(%esi)		/ set envp
92	addl	$-4,%edi		/ start loop at &env[-1]
93.L00:	addl	$4,%edi			/ next
94	cmpl	$0,(%edi)		/ search for 0 at end of env
95	jne	.L00
96	addl	$4,%edi			/ advance past 0
97	movl	$EB_AUXV,16(%esi)	/ set up tag for auxv
98	movl	%edi,20(%esi)		/ point to auxv
99	movl	$EB_NULL,24(%esi)	/ set up NULL tag
100	call	.L01		/ only way to get IP into a register
101.L01:	popl	%ebx		/ pop the IP we just "pushed"
102	leal	s.EMPTY - .L01(%ebx),%eax
103	pushl	%eax
104	leal	s.ZERO - .L01(%ebx),%eax
105	pushl	%eax
106	leal	s.LDSO - .L01(%ebx),%eax
107	pushl	%eax
108	movl	%esp,%edi	/ save pointer to strings
109	leal	f.MUNMAP - .L01(%ebx),%eax
110	pushl	%eax
111	leal	f.CLOSE - .L01(%ebx),%eax
112	pushl	%eax
113	leal	f.SYSCONFIG - .L01(%ebx),%eax
114	pushl	%eax
115	leal	f.FSTAT - .L01(%ebx),%eax
116	pushl	%eax
117	leal	f.MMAP - .L01(%ebx),%eax
118	pushl	%eax
119	leal	f.OPEN - .L01(%ebx),%eax
120	pushl	%eax
121	leal	f.PANIC - .L01(%ebx),%eax
122	pushl	%eax
123	movl	%esp,%ecx	/ save pointer to functions
124
125	pushl	%ecx		/ address of functions
126	pushl	%edi		/ address of strings
127	pushl	%esi		/ &eb[0]
128	call	__rtld		/ __rtld(&eb[0], strings, funcs)
129	movl	%esi,%esp	/ restore the stack (but leaving boot vector)
130	jmp	*%eax 		/ transfer control to ld.so.1
131	.size	__rtboot,.-__rtboot
132
133	.align	4
134s.LDSO:		.string	"/usr/lib/ld.so.1"
135s.ZERO:		.string	"/dev/zero"
136s.EMPTY:	.string	"(null)"
137s.ERROR:	.string	": no (or bad) /usr/lib/ld.so.1\n"
138l.ERROR:
139
140	.align	4
141f.PANIC:
142	movl	%esp,%ebp
143/ Add using of argument string
144	pushl	$l.ERROR - s.ERROR
145	call	.L02
146.L02:	popl	%ebx
147	leal	s.ERROR - .L02(%ebx),%eax
148	pushl	%eax
149	pushl	$2
150	call	f.WRITE
151	jmp	f.EXIT
152/ Not reached
153
154f.OPEN:
155	movl	$SYS_open,%eax
156	jmp	__syscall
157f.MMAP:
158	movl	$SYS_mmap,%eax
159	jmp	__syscall
160f.MUNMAP:
161	movl	$SYS_munmap,%eax
162	jmp	__syscall
163f.READ:
164	movl	$SYS_read,%eax
165	jmp	__syscall
166f.WRITE:
167	movl	$SYS_write,%eax
168	jmp	__syscall
169f.LSEEK:
170	movl	$SYS_lseek,%eax
171	jmp	__syscall
172f.CLOSE:
173	movl	$SYS_close,%eax
174	jmp	__syscall
175f.FSTAT:
176	movl	$SYS_fxstat,%eax	/ NEEDSWORK: temp kludge for G6
177	jmp	__syscall
178f.SYSCONFIG:
179	movl	$SYS_sysconfig,%eax
180	jmp	__syscall
181f.EXIT:
182	movl	$SYS_exit,%eax
183/	jmp	__syscall
184__syscall:
185	int	$T_SYSCALLINT
186	jc	__err_exit
187	ret
188__err_exit:
189	movl	$-1,%eax
190	ret
191