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
|
/* Copyright (C) 2003 Red Hat, Inc.
Contributed by Alexandre Oliva <aoliva@redhat.com>
This file is part of uClibc.
uClibc is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
uClibc is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with uClibc; see the file COPYING.LIB. If not, see
<http://www.gnu.org/licenses/>. */
/* The function below is tail-called by resolver stubs when a
lazily-bound function is called. It must preserve all
registers that could be used to pass arguments to the actual
function. Upon _dl_linux_resolve entry, GR14 holds the
address of a lazy PLT entry, so @(GR14,-4) is the lazy
relocation number that we have to pass to _dl_linux_resolver.
GR15 holds the caller's GOT, from which we extract the
elf_resolve* that _dl_linux_resolver needs as well.
_dl_linux_resolver() figures out where the jump symbol is
_really_ supposed to have jumped to and returns that to us.
Once we have that, we prepare to tail-call the actual
function, clean up after ourselves, restoring the original
arguments, then jump to the fixed up address. */
.text
.p2align 4
.hidden __dl_linux_resolve
.global __dl_linux_resolve
.type __dl_linux_resolve,@function
__dl_linux_resolve:
/* Preserve arguments. */
[--SP] = RETS;
[--SP] = P0;
[--SP] = R0;
[--SP] = R1;
[--SP] = R2;
sp += -12;
/* Prepare to call _dl_linux_resolver. */
R0 = [P3 + 8];
/* Not aligned for space reasons. */
R1 = W[P1 + -4] (Z);
P1 += -2;
R1.H = W[P1];
P3 = R3;
CALL __dl_linux_resolver;
/* Move aside return value that contains the FUNCDESC_VALUE. */
P3 = R0;
P1 = [P3];
P3 = [P3 + 4];
/* Restore arguments. */
sp += 12;
R2 = [SP++];
R1 = [SP++];
R0 = [SP++];
P0 = [SP++];
RETS = [SP++];
/* Now jump to the actual function. */
JUMP (P1);
.size __dl_linux_resolve, . - __dl_linux_resolve
|
