diff options
Diffstat (limited to 'libcpu')
| -rw-r--r-- | libcpu/arm/cortex-a/context_gcc.S | 81 | ||||
| -rw-r--r-- | libcpu/arm/cortex-a/start_gcc.S | 39 |
2 files changed, 60 insertions, 60 deletions
diff --git a/libcpu/arm/cortex-a/context_gcc.S b/libcpu/arm/cortex-a/context_gcc.S index af5c516e4d..dff7a1de68 100644 --- a/libcpu/arm/cortex-a/context_gcc.S +++ b/libcpu/arm/cortex-a/context_gcc.S @@ -46,16 +46,7 @@ rt_hw_context_switch_to: mov r0, r1 bl rt_cpus_lock_status_restore #endif /*RT_USING_SMP*/ - -#ifdef RT_USING_LWP - ldmfd sp, {r13, r14}^ @ pop usr_sp usr_lr - add sp, #8 -#endif - - ldmfd sp!, {r4} @ pop new task spsr - msr spsr_cxsf, r4 - - ldmfd sp!, {r0-r12, lr, pc}^ @ pop new task r0-r12, lr & pc + b rt_hw_context_switch_exit .section .bss.share.isr _guest_switch_lvl: @@ -93,15 +84,7 @@ rt_hw_context_switch: mov r0, r2 bl rt_cpus_lock_status_restore #endif /*RT_USING_SMP*/ - -#ifdef RT_USING_LWP - ldmfd sp, {r13, r14}^ @ pop usr_sp usr_lr - add sp, #8 -#endif - - ldmfd sp!, {r4} @ pop new task cpsr to spsr - msr spsr_cxsf, r4 - ldmfd sp!, {r0-r12, lr, pc}^ @ pop new task r0-r12, lr & pc, copy spsr to cpsr + b rt_hw_context_switch_exit /* * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to); @@ -123,51 +106,19 @@ rt_hw_context_switch: .globl rt_hw_context_switch_interrupt rt_hw_context_switch_interrupt: #ifdef RT_USING_SMP - /* r0 :irq_mod context + /* r0 :svc_mod context * r1 :addr of from_thread's sp * r2 :addr of to_thread's sp * r3 :to_thread's tcb */ - @ r0 point to {r0-r3} in stack - push {r1 - r3} - mov r1, r0 - add r0, r0, #4*4 - ldmfd r0!, {r4-r12,lr}@ reload saved registers - mrs r3, spsr @ get cpsr of interrupt thread - sub r2, lr, #4 @ save old task's pc to r2 - msr cpsr_c, #I_Bit|F_Bit|Mode_SVC - - stmfd sp!, {r2} @ push old task's pc - stmfd sp!, {r4-r12,lr}@ push old task's lr,r12-r4 - ldmfd r1, {r4-r7} @ restore r0-r3 of the interrupt thread - stmfd sp!, {r4-r7} @ push old task's r0-r3 - stmfd sp!, {r3} @ push old task's cpsr - -#ifdef RT_USING_LWP - stmfd sp, {r13,r14}^ @push usr_sp usr_lr - sub sp, #8 -#endif - - msr cpsr_c, #I_Bit|F_Bit|Mode_IRQ - pop {r1 - r3} - mov sp, r0 - msr cpsr_c, #I_Bit|F_Bit|Mode_SVC - str sp, [r1] + str r0, [r1] ldr sp, [r2] mov r0, r3 bl rt_cpus_lock_status_restore -#ifdef RT_USING_LWP - ldmfd sp, {r13,r14}^ @pop usr_sp usr_lr - add sp, #8 -#endif - - ldmfd sp!, {r4} @ pop new task's cpsr to spsr - msr spsr_cxsf, r4 - - ldmfd sp!, {r0-r12,lr,pc}^ @ pop new task's r0-r12,lr & pc, copy spsr to cpsr + b rt_hw_context_switch_exit #else /*RT_USING_SMP*/ ldr r2, =rt_thread_switch_interrupt_flag @@ -183,3 +134,25 @@ _reswitch: str r1, [r2] bx lr #endif /*RT_USING_SMP*/ + +.global rt_hw_context_switch_exit +rt_hw_context_switch_exit: + +#ifdef RT_USING_SMP +#ifdef RT_USING_SIGNALS + mov r0, sp + cps #Mode_IRQ + bl rt_signal_check + cps #Mode_SVC + mov sp, r0 +#endif +#endif + +#ifdef RT_USING_LWP + ldmfd sp, {r13, r14}^ /* usr_sp, usr_lr */ + add sp, #8 +#endif + ldmfd sp!, {r1} + msr spsr_cxsf, r1 /* original mode */ + ldmfd sp!, {r0-r12,lr,pc}^ /* irq return */ + diff --git a/libcpu/arm/cortex-a/start_gcc.S b/libcpu/arm/cortex-a/start_gcc.S index 51026b7ed5..014846f3aa 100644 --- a/libcpu/arm/cortex-a/start_gcc.S +++ b/libcpu/arm/cortex-a/start_gcc.S @@ -11,7 +11,6 @@ */ #include "rtconfig.h" - .equ Mode_USR, 0x10 .equ Mode_FIQ, 0x11 .equ Mode_IRQ, 0x12 @@ -158,20 +157,48 @@ vector_fiq: vector_irq: #ifdef RT_USING_SMP clrex + + stmfd sp!, {r0, r1} + cps #Mode_SVC + mov r0, sp /* svc_sp */ + mov r1, lr /* svc_lr */ + + cps #Mode_IRQ + sub lr, #4 + stmfd r0!, {r1, lr} /* svc_lr, svc_pc */ + stmfd r0!, {r2 - r12} + ldmfd sp!, {r1, r2} /* original r0, r1 */ + stmfd r0!, {r1 - r2} + mrs r1, spsr /* original mode */ + stmfd r0!, {r1} + +#ifdef RT_USING_LWP + stmfd r0, {r13, r14}^ /* usr_sp, usr_lr */ + sub r0, #8 #endif - stmfd sp!, {r0-r12,lr} + /* now irq stack is clean */ + /* r0 is task svc_sp */ + /* backup r0 -> r8 */ + mov r8, r0 bl rt_interrupt_enter bl rt_hw_trap_irq bl rt_interrupt_leave -#ifdef RT_USING_SMP - mov r0, sp + cps #Mode_SVC + mov sp, r8 + mov r0, r8 bl rt_scheduler_do_irq_switch - ldmfd sp!, {r0-r12,lr} - subs pc, lr, #4 + b rt_hw_context_switch_exit + #else + stmfd sp!, {r0-r12,lr} + + bl rt_interrupt_enter + bl rt_hw_trap_irq + bl rt_interrupt_leave + @ if rt_thread_switch_interrupt_flag set, jump to @ rt_hw_context_switch_interrupt_do and don't return ldr r0, =rt_thread_switch_interrupt_flag |