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update libcpu/arm/cortex-m3: restore MSP.

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aozima
2013-06-18 11:25:56 +08:00
parent f9e673354a
commit 4d421cad73
3 changed files with 129 additions and 102 deletions
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9
libcpu/arm/cortex-m3/context_rvds.S
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@@ -10,6 +10,7 @@
; * Change Logs:
; * Date Author Notes
; * 2009-01-17 Bernard first version
; * 2013-06-18 aozima add restore MSP feature.
; */
;/**
@@ -17,6 +18,7 @@
; */
;/*@{*/
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)
@@ -158,6 +160,13 @@ 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