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
|
/* Copyright (C) 2003, 2005, 2010 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>.
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; see the file COPYING.LIB. If
not, see <http://www.gnu.org/licenses/>. */
/* It's vitally important that _Unwind_Resume not have a stack frame; the
ARM unwinder relies on register state at entrance. So we write this in
assembly. */
#include <sysdep.h>
__asm__ (
" .globl _Unwind_Resume\n"
" .hidden _Unwind_Resume\n"
" .type _Unwind_Resume, %function\n"
"_Unwind_Resume:\n"
" " CFI_SECTIONS (.debug_frame) "\n"
" " CFI_STARTPROC "\n"
" stmfd sp!, {r4, r5, r6, lr}\n"
" " CFI_ADJUST_CFA_OFFSET (16)" \n"
" " CFI_REL_OFFSET (r4, 0) "\n"
" " CFI_REL_OFFSET (r5, 4) "\n"
" " CFI_REL_OFFSET (r6, 8) "\n"
" " CFI_REL_OFFSET (lr, 12) "\n"
" " CFI_REMEMBER_STATE "\n"
" ldr r4, 1f\n"
" ldr r5, 2f\n"
"3: add r4, pc, r4\n"
" ldr r3, [r4, r5]\n"
" mov r6, r0\n"
" cmp r3, #0\n"
" beq 4f\n"
"5: mov r0, r6\n"
" ldmfd sp!, {r4, r5, r6, lr}\n"
" " CFI_ADJUST_CFA_OFFSET (-16) "\n"
" " CFI_RESTORE (r4) "\n"
" " CFI_RESTORE (r5) "\n"
" " CFI_RESTORE (r6) "\n"
" " CFI_RESTORE (lr) "\n"
" bx r3\n"
" " CFI_RESTORE_STATE "\n"
"4: bl __libgcc_s_init\n"
" ldr r3, [r4, r5]\n"
" b 5b\n"
" " CFI_ENDPROC "\n"
" .align 2\n"
#ifdef __thumb2__
"1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 4\n"
#else
"1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 8\n"
#endif
"2: .word __libgcc_s_resume(GOTOFF)\n"
" .size _Unwind_Resume, .-_Unwind_Resume\n"
);
|
