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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file compilers/RVCT/chcoreasm_v6m.s
* @brief ARMv6-M architecture port low level code.
*
* @addtogroup ARMCMx_RVCT_CORE
* @{
*/
#if !defined(FALSE) || defined(__DOXYGEN__)
#define FALSE 0
#endif
#if !defined(TRUE) || defined(__DOXYGEN__)
#define TRUE 1
#endif
#define _FROM_ASM_
#include "chconf.h"
#include "chcore.h"
#if !defined(__DOXYGEN__)
CONTEXT_OFFSET EQU 12
SCB_ICSR EQU 0xE000ED04
PRESERVE8
THUMB
AREA |.text|, CODE, READONLY
IMPORT chThdExit
IMPORT chSchDoReschedule
#if CH_DBG_SYSTEM_STATE_CHECK
IMPORT dbg_check_unlock
IMPORT dbg_check_lock
#endif
/*
* Performs a context switch between two threads.
*/
EXPORT _port_switch
_port_switch PROC
push {r4, r5, r6, r7, lr}
mov r4, r8
mov r5, r9
mov r6, r10
mov r7, r11
push {r4, r5, r6, r7}
mov r3, sp
str r3, [r1, #CONTEXT_OFFSET]
ldr r3, [r0, #CONTEXT_OFFSET]
mov sp, r3
pop {r4, r5, r6, r7}
mov r8, r4
mov r9, r5
mov r10, r6
mov r11, r7
pop {r4, r5, r6, r7, pc}
ENDP
/*
* Start a thread by invoking its work function.
* If the work function returns @p chThdExit() is automatically invoked.
*/
EXPORT _port_thread_start
_port_thread_start PROC
#if CH_DBG_SYSTEM_STATE_CHECK
bl dbg_check_unlock
#endif
cpsie i
mov r0, r5
blx r4
bl chThdExit
ENDP
/*
* Post-IRQ switch code.
* Exception handlers return here for context switching.
*/
EXPORT _port_switch_from_isr
EXPORT _port_exit_from_isr
_port_switch_from_isr PROC
#if CH_DBG_SYSTEM_STATE_CHECK
bl dbg_check_lock
#endif
bl chSchDoReschedule
#if CH_DBG_SYSTEM_STATE_CHECK
bl dbg_check_unlock
#endif
_port_exit_from_isr
ldr r2, =SCB_ICSR
movs r3, #128
#if CORTEX_ALTERNATE_SWITCH
lsls r3, r3, #21
str r3, [r2, #0]
cpsie i
#else
lsls r3, r3, #24
str r3, [r2, #0]
#endif
waithere b waithere
ENDP
END
#endif /* !defined(__DOXYGEN__) */
/** @} */
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