1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
* 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 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "_rtboot.s"
/ bootstrap routine for run-time linker
/ we get control from exec which has loaded our text and
/ data into the process' address space and created the process
/ stack
/
/ on entry, the process stack looks like this:
/
/ # <- %esp
/_______________________# high addresses
/ strings #
/_______________________#
/ 0 word #
/_______________________#
/ Auxiliary #
/ entries #
/ ... #
/ (size varies) #
/_______________________#
/ 0 word #
/_______________________#
/ Environment #
/ pointers #
/ ... #
/ (one word each) #
/_______________________#
/ 0 word #
/_______________________#
/ Argument # low addresses
/ pointers #
/ Argc words #
/_______________________#
/ argc #
/_______________________# <- %ebp
#include <SYS.h>
.set EB_NULL,0
.set EB_DYNAMIC,1
.set EB_LDSO_BASE,2
.set EB_ARGV,3
.set EB_ENVP,4
.set EB_AUXV,5
.set EB_DEVZERO,6
.set EB_PAGESIZE,7
.set EB_MAX,8
.set EB_MAX_SIZE32,64
.text
.globl __rtboot
.globl __rtld
.type __rtboot,@function
.align 4
__rtboot:
movl %esp,%ebp
subl $EB_MAX_SIZE32,%esp / make room for a max sized boot vector
movl %esp,%esi / use esi as a pointer to &eb[0]
movl $EB_ARGV,0(%esi) / set up tag for argv
leal 4(%ebp),%eax / get address of argv
movl %eax,4(%esi) / put after tag
movl $EB_ENVP,8(%esi) / set up tag for envp
movl (%ebp),%eax / get # of args
addl $2,%eax / one for the zero & one for argc
leal (%ebp,%eax,4),%edi / now points past args & @ envp
movl %edi,12(%esi) / set envp
addl $-4,%edi / start loop at &env[-1]
.L00: addl $4,%edi / next
cmpl $0,(%edi) / search for 0 at end of env
jne .L00
addl $4,%edi / advance past 0
movl $EB_AUXV,16(%esi) / set up tag for auxv
movl %edi,20(%esi) / point to auxv
movl $EB_NULL,24(%esi) / set up NULL tag
call .L01 / only way to get IP into a register
.L01: popl %ebx / pop the IP we just "pushed"
leal s.EMPTY - .L01(%ebx),%eax
pushl %eax
leal s.ZERO - .L01(%ebx),%eax
pushl %eax
leal s.LDSO - .L01(%ebx),%eax
pushl %eax
movl %esp,%edi / save pointer to strings
leal f.MUNMAP - .L01(%ebx),%eax
pushl %eax
leal f.CLOSE - .L01(%ebx),%eax
pushl %eax
leal f.SYSCONFIG - .L01(%ebx),%eax
pushl %eax
leal f.FSTATAT - .L01(%ebx),%eax
pushl %eax
leal f.MMAP - .L01(%ebx),%eax
pushl %eax
leal f.OPENAT - .L01(%ebx),%eax
pushl %eax
leal f.PANIC - .L01(%ebx),%eax
pushl %eax
movl %esp,%ecx / save pointer to functions
pushl %ecx / address of functions
pushl %edi / address of strings
pushl %esi / &eb[0]
call __rtld / __rtld(&eb[0], strings, funcs)
movl %esi,%esp / restore the stack (but leaving boot vector)
jmp *%eax / transfer control to ld.so.1
.size __rtboot,.-__rtboot
.align 4
s.LDSO: .string "/usr/lib/ld.so.1"
s.ZERO: .string "/dev/zero"
s.EMPTY: .string "(null)"
s.ERROR: .string ": no (or bad) /usr/lib/ld.so.1\n"
l.ERROR:
.align 4
f.PANIC:
movl %esp,%ebp
/ Add using of argument string
pushl $l.ERROR - s.ERROR
call .L02
.L02: popl %ebx
leal s.ERROR - .L02(%ebx),%eax
pushl %eax
pushl $2
call f.WRITE
jmp f.EXIT
/ Not reached
f.OPENAT:
movl $SYS_openat,%eax
jmp __syscall
f.MMAP:
movl $SYS_mmap,%eax
jmp __syscall
f.MUNMAP:
movl $SYS_munmap,%eax
jmp __syscall
f.READ:
movl $SYS_read,%eax
jmp __syscall
f.WRITE:
movl $SYS_write,%eax
jmp __syscall
f.LSEEK:
movl $SYS_lseek,%eax
jmp __syscall
f.CLOSE:
movl $SYS_close,%eax
jmp __syscall
f.FSTATAT:
movl $SYS_fstatat,%eax
jmp __syscall
f.SYSCONFIG:
movl $SYS_sysconfig,%eax
jmp __syscall
f.EXIT:
movl $SYS_exit,%eax
/ jmp __syscall
__syscall:
int $T_SYSCALLINT
jc __err_exit
ret
__err_exit:
movl $-1,%eax
ret
|
