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/*
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio.
This file is part of ChibiOS.
ChibiOS 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 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/IAR/chcoreasm_v6m.s
* @brief ARMv6-M architecture port low level code.
*
* @addtogroup ARMCMx_IAR_CORE
* @{
*/
#if !defined(FALSE) || defined(__DOXYGEN__)
#define FALSE 0
#endif
#if !defined(TRUE) || defined(__DOXYGEN__)
#define TRUE 1
#endif
#define _FROM_ASM_
#include "chlicense.h"
#include "chconf.h"
#include "chcore.h"
#if !defined(__DOXYGEN__)
/*
* RTOS-specific context offset.
*/
#if defined(_CHIBIOS_RT_CONF_)
#define CONTEXT_OFFSET 12
#elif defined(_CHIBIOS_NIL_CONF_)
#define CONTEXT_OFFSET 0
#else
#error "invalid chconf.h"
#endif
MODULE ?chcoreasm_v6m
AAPCS INTERWORK, VFP_COMPATIBLE
PRESERVE8
SCB_ICSR SET 0xE000ED04
SECTION .text:CODE:NOROOT(2)
EXTERN chThdExit
EXTERN chSysHalt
EXTERN chSchDoReschedule
#if CH_DBG_STATISTICS
EXTERN _stats_start_measure_crit_thd
EXTERN _stats_stop_measure_crit_thd
#endif
#if CH_DBG_SYSTEM_STATE_CHECK
EXTERN _dbg_check_unlock
EXTERN _dbg_check_lock
#endif
THUMB
/*
* Performs a context switch between two threads.
*/
PUBLIC _port_switch
_port_switch:
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}
/*
* Start a thread by invoking its work function.
* If the work function returns @p chThdExit() is automatically invoked.
*/
PUBLIC _port_thread_start
_port_thread_start:
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_unlock
#endif
#if CH_DBG_STATISTICS
bl _stats_stop_measure_crit_thd
#endif
cpsie i
mov r0, r5
blx r4
#if defined(_CHIBIOS_RT_CONF_)
movs r0, #0 /* MSG_OK */
bl chThdExit
#endif
#if defined(_CHIBIOS_NIL_CONF_)
mov r3, #0
bl chSysHalt
#endif
/*
* Post-IRQ switch code.
* Exception handlers return here for context switching.
*/
PUBLIC _port_switch_from_isr
PUBLIC _port_exit_from_isr
_port_switch_from_isr:
#if CH_DBG_STATISTICS
bl _stats_start_measure_crit_thd
#endif
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_lock
#endif
bl chSchDoReschedule
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_unlock
#endif
#if CH_DBG_STATISTICS
bl _stats_stop_measure_crit_thd
#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
END
#endif /* !defined(__DOXYGEN__) */
/** @} */
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