1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2008 CodeSourcery
3
4This file is part of libunwind.
5
6Permission is hereby granted, free of charge, to any person obtaining
7a copy of this software and associated documentation files (the
8"Software"), to deal in the Software without restriction, including
9without limitation the rights to use, copy, modify, merge, publish,
10distribute, sublicense, and/or sell copies of the Software, and to
11permit persons to whom the Software is furnished to do so, subject to
12the following conditions:
13
14The above copyright notice and this permission notice shall be
15included in all copies or substantial portions of the Software.
16
17THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
24
25#include "offsets.h"
26
27	.text
28	.arm
29
30	.global _Uarm_getcontext
31	.type	_Uarm_getcontext, %function
32	@ This is a stub version of getcontext() for ARM which only stores core
33	@ registers.  It must be called in a special way, not as a regular
34	@ function -- see also the libunwind-arm.h:unw_tdep_getcontext macro.
35_Uarm_getcontext:
36	stmfd sp!, {r0, r1}
37	@ store r0
38	str r0, [r0, #LINUX_UC_MCONTEXT_OFF + LINUX_SC_R0_OFF]
39	add r0, r0, #LINUX_UC_MCONTEXT_OFF + LINUX_SC_R0_OFF
40	@ store r1 to r12
41	stmib r0, {r1-r12}
42	@ reconstruct r13 at call site, then store
43	add r1, sp, #12
44	str r1, [r0, #13 * 4]
45	@ retrieve r14 from call site, then store
46	ldr r1, [sp, #8]
47	str r1, [r0, #14 * 4]
48	@ point lr to instruction after call site's stack adjustment
49	add r1, lr, #4
50	str r1, [r0, #15 * 4]
51	ldmfd sp!, {r0, r1}
52	bx lr
53#ifdef __linux__
54 /* We do not need executable stack.  */
55 .section  .note.GNU-stack,"",%progbits
56#endif
57