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
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <linux/linkage.h>
#include <asm/sections.h>
.section .text.setupc
/*
* setup_c: clear bss
*/
ENTRY(setup_c)
mov x15, x30
ldr x0, =__bss_start
mov x1, #0
ldr x2, =__bss_stop
sub x2, x2, x0
bl memset /* clear bss */
mov x30, x15
ret
ENDPROC(setup_c)
/*
* void relocate_to_adr(unsigned long targetadr)
*
* Copy binary to targetadr, relocate code and continue
* executing at new address.
*/
.section .text.relocate_to_adr
/* x0: target address */
#ifdef __PBL__
ENTRY(relocate_to_adr_full)
ldr x2, =__image_end
b 1f
#endif
ENTRY(relocate_to_adr)
ldr x2, =__bss_start
b 1f
1:
stp x19, x20, [sp, #-16]!
stp x21, x22, [sp, #-16]!
mov x19, x30
mov x21, x0
bl get_runtime_offset
mov x5, x0
ldr x0, =_text
mov x20, x0
add x1, x0, x5 /* x1: from address */
cmp x1, x21 /* already at correct address? */
beq 1f /* yes, skip copy to new address */
sub x2, x2, x0 /* x2: size */
mov x0, x21 /* x0: target */
/* adjust return address */
sub x19, x19, x1 /* sub address where we are actually running */
add x19, x19, x0 /* add address where we are going to run */
bl memcpy /* copy binary */
bl sync_caches_for_execution
mov x0,#0
ic ivau, x0 /* flush icache */
ldr x0,=1f
sub x0, x0, x20
add x0, x0, x21
br x0 /* jump to relocated address */
1:
bl relocate_to_current_adr /* relocate binary */
mov x30, x19
ldp x21, x22, [sp], #16
ldp x19, x20, [sp], #16
ret
ENDPROC(relocate_to_adr)
|
