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[libcpu/arm] fix race condition with ldrex,strex (#7842)

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Signed-off-by: Shell <smokewood@qq.com>
This commit is contained in:
Shell
2023-07-25 14:07:44 +08:00
committed by GitHub
parent 0a6aaf12ad
commit acfa74f078
6 changed files with 23 additions and 15 deletions
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libcpu/arm/cortex-a/context_gcc.S
+3
View File
@@ -40,6 +40,7 @@ rt_hw_interrupt_enable:
*/
.globl rt_hw_context_switch_to
rt_hw_context_switch_to:
clrex
ldr sp, [r0] @ get new task stack pointer
#ifdef RT_USING_SMP
@@ -76,6 +77,7 @@ _guest_switch_lvl:
*/
.globl rt_hw_context_switch
rt_hw_context_switch:
clrex
stmfd sp!, {lr} @ push pc (lr should be pushed in place of PC)
stmfd sp!, {r0-r12, lr} @ push lr & register file
@@ -143,6 +145,7 @@ rt_hw_context_switch:
.globl rt_interrupt_to_thread
.globl rt_hw_context_switch_interrupt
rt_hw_context_switch_interrupt:
clrex
#ifdef RT_USING_SMP
/* r0 :svc_mod context
* r1 :addr of from_thread's sp
libcpu/arm/cortex-a/start_gcc.S
-2
View File
@@ -408,8 +408,6 @@ vector_fiq:
.globl vector_irq
vector_irq:
#ifdef RT_USING_SMP
clrex
stmfd sp!, {r0, r1}
cps #Mode_SVC
mov r0, sp /* svc_sp */