source: rtems/cpukit/score/cpu/arm/armv7m-multitasking-start-stop.c @ 2afb22b

5
Last change on this file since 2afb22b was c499856, checked in by Chris Johns <chrisj@…>, on 03/20/14 at 21:10:47

Change all references of rtems.com to rtems.org.

  • Property mode set to 100644
File size: 995 bytes
Line 
1/**
2 * @file
3 *
4 * @brief ARMV7M Start Multitasking
5 */
6
7/*
8 * Copyright (c) 2011-2014 Sebastian Huber.  All rights reserved.
9 *
10 *  embedded brains GmbH
11 *  Dornierstr. 4
12 *  82178 Puchheim
13 *  Germany
14 *  <rtems@embedded-brains.de>
15 *
16 * The license and distribution terms for this file may be
17 * found in the file LICENSE in this distribution or at
18 * http://www.rtems.org/license/LICENSE.
19 */
20
21#ifdef HAVE_CONFIG_H
22  #include "config.h"
23#endif
24
25#include <rtems/score/armv7m.h>
26
27#ifdef ARM_MULTILIB_ARCH_V7M
28
29void __attribute__((naked)) _ARMV7M_Start_multitasking(
30  Context_Control *heir
31)
32{
33  __asm__ volatile (
34    /* Restore heir context */
35    "ldr r2, [r0, %[spctxoff]]\n"
36    "msr psp, r2\n"
37    "ldm r0, {r4-r11, lr}\n"
38    /* Enable process stack pointer (PSP) */
39    "mrs r2, control\n"
40    "orr r2, #0x2\n"
41    "msr control, r2\n"
42    /* Return to heir */
43    "bx lr\n"
44    :
45    : [spctxoff] "J" (offsetof(Context_Control, register_sp))
46  );
47}
48
49#endif /* ARM_MULTILIB_ARCH_V7M */
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