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update libcpu/arm/cortex-m4: restore MSP.

This commit is contained in:
aozima 2013-06-18 11:10:42 +08:00
parent bee9103eaf
commit f9e673354a
3 changed files with 35 additions and 8 deletions
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19
libcpu/arm/cortex-m4/context_gcc.S
View File

@ -11,6 +11,7 @@
* Date Author Notes
* 2009-10-11 Bernard first version
* 2012-01-01 aozima support context switch load/store FPU register.
* 2013-06-18 aozima add restore MSP feature.
*/
/**
@ -23,10 +24,11 @@
.thumb
.text
.equ NVIC_INT_CTRL, 0xE000ED04 /* interrupt control state register */
.equ NVIC_SYSPRI2, 0xE000ED20 /* system priority register (2) */
.equ NVIC_PENDSV_PRI, 0x00FF0000 /* PendSV priority value (lowest) */
.equ NVIC_PENDSVSET, 0x10000000 /* value to trigger PendSV exception */
.equ SCB_VTOR, 0xE000ED04 /* Vector Table Offset Register */
.equ NVIC_INT_CTRL, 0xE000ED04 /* interrupt control state register */
.equ NVIC_SYSPRI2, 0xE000ED20 /* system priority register (2) */
.equ NVIC_PENDSV_PRI, 0x00FF0000 /* PendSV priority value (lowest) */
.equ NVIC_PENDSVSET, 0x10000000 /* value to trigger PendSV exception */
/*
* rt_base_t rt_hw_interrupt_disable();
@ -106,7 +108,7 @@ PendSV_Handler:
MRS r1, psp /* get from thread stack pointer */
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
VSTMDB r1!, {d8 - d15} /* push FPU register s16~s31 */
VSTMDB r1!, {d8 - d15} /* push FPU register s16~s31 */
#endif
STMFD r1!, {r4 - r11} /* push r4 - r11 register */
@ -164,6 +166,13 @@ rt_hw_context_switch_to:
LDR r1, =NVIC_PENDSVSET
STR r1, [r0]
/* restore MSP */
LDR r0, =SCB_VTOR
LDR r0, [r0]
LDR r0, [r0]
NOP
MSR msp, r0
CPSIE I /* enable interrupts at processor level */
/* never reach here! */

9
libcpu/arm/cortex-m4/context_iar.S
View File

@ -12,6 +12,7 @@
; * 2009-01-17 Bernard first version
; * 2009-09-27 Bernard add protect when contex switch occurs
; * 2012-01-01 aozima support context switch load/store FPU register.
; * 2013-06-18 aozima add restore MSP feature.
; */
;/**
@ -19,6 +20,7 @@
; */
;/*@{*/
SCB_VTOR EQU 0xE000ED08 ; Vector Table Offset Register
NVIC_INT_CTRL EQU 0xE000ED04 ; interrupt control state register
NVIC_SYSPRI2 EQU 0xE000ED20 ; system priority register (2)
NVIC_PENDSV_PRI EQU 0x00FF0000 ; PendSV priority value (lowest)
@ -162,6 +164,13 @@ rt_hw_context_switch_to:
LDR r1, =NVIC_PENDSVSET
STR r1, [r0]
; restore MSP
LDR r0, =SCB_VTOR
LDR r0, [r0]
LDR r0, [r0]
NOP
MSR msp, r0
CPSIE I ; enable interrupts at processor level
; never reach here!

13
libcpu/arm/cortex-m4/context_rvds.S
View File

@ -11,6 +11,7 @@
; * Date Author Notes
; * 2009-01-17 Bernard first version.
; * 2012-01-01 aozima support context switch load/store FPU register.
; * 2013-06-18 aozima add restore MSP feature.
; */
;/**
@ -18,6 +19,7 @@
; */
;/*@{*/
SCB_VTOR EQU 0xE000ED08 ; Vector Table Offset Register
NVIC_INT_CTRL EQU 0xE000ED04 ; interrupt control state register
NVIC_SYSPRI2 EQU 0xE000ED20 ; system priority register (2)
NVIC_PENDSV_PRI EQU 0x00FF0000 ; PendSV priority value (lowest)
@ -108,10 +110,10 @@ PendSV_Handler PROC
MRS r1, psp ; get from thread stack pointer
IF {FPU} != "SoftVFP"
VSTMFD r1!, {d8 - d15} ; push FPU register s16~s31
VSTMFD r1!, {d8 - d15} ; push FPU register s16~s31
ENDIF
STMFD r1!, {r4 - r11} ; push r4 - r11 register
STMFD r1!, {r4 - r11} ; push r4 - r11 register
LDR r0, [r0]
STR r1, [r0] ; update from thread stack pointer
@ -169,6 +171,13 @@ rt_hw_context_switch_to PROC
LDR r1, =NVIC_PENDSVSET
STR r1, [r0]
; restore MSP
LDR r0, =SCB_VTOR
LDR r0, [r0]
LDR r0, [r0]
NOP
MSR msp, r0
; enable interrupts at processor level
CPSIE I