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
|
/* Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <features.h>
#include <bits/arm_asm.h>
#include <bits/arm_bx.h>
/* In the EABI syscall interface, we don't need a special syscall to
implement syscall(). It won't work reliably with 64-bit arguments
(but that is true on many modern platforms). */
.text
.global syscall
.type syscall,%function
.align 4
#if defined(THUMB1_ONLY)
.thumb_func
syscall:
push {r4, r5, r6, r7}
mov ip, r0
mov r0, r1
mov r1, r2
mov r2, r3
add r7, sp, #(4 * 4)
ldmia r7!, {r3, r4, r5, r6}
mov r7, ip
swi 0x0
pop {r4, r5, r6, r7}
ldr r1, =0xfffff000
cmp r0, r1
bcs 1f
bx lr
1:
push {r3, lr}
bl __syscall_error
POP_RET
.pool
#else
syscall:
mov ip, sp
stmfd sp!, {r4, r5, r6, r7}
mov r7, r0
mov r0, r1
mov r1, r2
mov r2, r3
ldmfd ip, {r3, r4, r5, r6}
swi 0x0
ldmfd sp!, {r4, r5, r6, r7}
cmn r0, #4096
IT(t, cc)
BXC(cc, lr)
b __syscall_error
#endif
.size syscall,.-syscall
|
