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update libcpu/arm/cortex-m4: support lazy stack optimized.

This commit is contained in:
aozima 2013-06-23 16:28:55 +08:00
parent b045f93b47
commit 34d59ccb0f
4 changed files with 151 additions and 17 deletions
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36
libcpu/arm/cortex-m4/context_gcc.S
View File

@ -12,10 +12,11 @@
* 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.
* 2013-06-23 aozima support lazy stack optimized.
*/
/**
* @addtogroup STM32
* @addtogroup cortex-m4
*/
/*@{*/
@ -108,10 +109,21 @@ PendSV_Handler:
MRS r1, psp /* get from thread stack pointer */
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
TST lr, #0x10 /* if(!EXC_RETURN[4]) */
VSTMDB r1!, {d8 - d15} /* push FPU register s16~s31 */
#endif
STMFD r1!, {r4 - r11} /* push r4 - r11 register */
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
MOV r4, #0x00 /* flag = 0 */
TST lr, #0x10 /* if(!EXC_RETURN[4]) */
MOVEQ r4, #0x01 /* flag = 1 */
STMFD r1!, {r4} /* push flag */
#endif
LDR r0, [r0]
STR r1, [r0] /* update from thread stack pointer */
@ -120,10 +132,15 @@ swtich_to_thread:
LDR r1, [r1]
LDR r1, [r1] /* load thread stack pointer */
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
LDMFD r1!, {r3} /* pop flag */
#endif
LDMFD r1!, {r4 - r11} /* pop r4 - r11 register */
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
VLDMIA r1!, {d8 - d15} /* pop FPU register s16~s31 */
CMP r3, #0 /* if(flag_r3 != 0) */
VLDMIANE r1!, {d8 - d15} /* pop FPU register s16~s31 */
#endif
MSR psp, r1 /* update stack pointer */
@ -132,6 +149,12 @@ pendsv_exit:
/* restore interrupt */
MSR PRIMASK, r2
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
ORR lr, lr, #0x10 /* lr |= (1 << 4), clean FPCA. */
CMP r3, #0 /* if(flag_r3 != 0) */
BICNE lr, lr, #0x10 /* lr &= ~(1 << 4), set FPCA. */
#endif
ORR lr, lr, #0x04
BX lr
@ -145,6 +168,13 @@ rt_hw_context_switch_to:
LDR r1, =rt_interrupt_to_thread
STR r0, [r1]
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
/* CLEAR CONTROL.FPCA */
MRS r2, CONTROL /* read */
BIC r2, #0x04 /* modify */
MSR CONTROL, r2 /* write-back */
#endif
/* set from thread to 0 */
LDR r1, =rt_interrupt_from_thread
MOV r0, #0x0

38
libcpu/arm/cortex-m4/context_iar.S
View File

@ -13,10 +13,11 @@
; * 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.
; * 2013-06-23 aozima support lazy stack optimized.
; */
;/**
; * @addtogroup STM32
; * @addtogroup cortex-m4
; */
;/*@{*/
@ -107,10 +108,25 @@ PendSV_Handler:
MRS r1, psp ; get from thread stack pointer
#if defined ( __ARMVFP__ )
TST lr, #0x10 ; if(!EXC_RETURN[4])
BNE skip_push_fpu
VSTMDB r1!, {d8 - d15} ; push FPU register s16~s31
skip_push_fpu
#endif
STMFD r1!, {r4 - r11} ; push r4 - r11 register
#if defined ( __ARMVFP__ )
MOV r4, #0x00 ; flag = 0
TST lr, #0x10 ; if(!EXC_RETURN[4])
BNE push_flag
MOV r4, #0x01 ; flag = 1
push_flag
;STMFD r1!, {r4} ; push flag
SUB r1, r1, #0x04
STR r4, [r1]
#endif
LDR r0, [r0]
STR r1, [r0] ; update from thread stack pointer
@ -119,10 +135,16 @@ swtich_to_thread
LDR r1, [r1]
LDR r1, [r1] ; load thread stack pointer
#if defined ( __ARMVFP__ )
LDMFD r1!, {r3} ; pop flag
#endif
LDMFD r1!, {r4 - r11} ; pop r4 - r11 register
#if defined ( __ARMVFP__ )
CBZ r3, skip_pop_fpu
VLDMIA r1!, {d8 - d15} ; pop FPU register s16~s31
skip_pop_fpu
#endif
MSR psp, r1 ; update stack pointer
@ -131,6 +153,13 @@ pendsv_exit
; restore interrupt
MSR PRIMASK, r2
#if defined ( __ARMVFP__ )
ORR lr, lr, #0x10 ; lr |= (1 << 4), clean FPCA.
CBZ r3, return_without_fpu ; if(flag_r3 != 0)
BIC lr, lr, #0x10 ; lr &= ~(1 << 4), set FPCA.
return_without_fpu
#endif
ORR lr, lr, #0x04
BX lr
@ -143,6 +172,13 @@ rt_hw_context_switch_to:
LDR r1, =rt_interrupt_to_thread
STR r0, [r1]
#if defined ( __ARMVFP__ )
; CLEAR CONTROL.FPCA
MRS r2, CONTROL ; read
BIC r2, r2, #0x04 ; modify
MSR CONTROL, r2 ; write-back
#endif
; set from thread to 0
LDR r1, =rt_interrupt_from_thread
MOV r0, #0x0

36
libcpu/arm/cortex-m4/context_rvds.S
View File

@ -12,10 +12,11 @@
; * 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.
; * 2013-06-23 aozima support lazy stack optimized.
; */
;/**
; * @addtogroup STM32
; * @addtogroup cortex-m4
; */
;/*@{*/
@ -110,10 +111,21 @@ PendSV_Handler PROC
MRS r1, psp ; get from thread stack pointer
IF {FPU} != "SoftVFP"
VSTMFD r1!, {d8 - d15} ; push FPU register s16~s31
TST lr, #0x10 ; if(!EXC_RETURN[4])
VSTMFDEQ r1!, {d8 - d15} ; push FPU register s16~s31
ENDIF
STMFD r1!, {r4 - r11} ; push r4 - r11 register
IF {FPU} != "SoftVFP"
MOV r4, #0x00 ; flag = 0
TST lr, #0x10 ; if(!EXC_RETURN[4])
MOVEQ r4, #0x01 ; flag = 1
STMFD r1!, {r4} ; push flag
ENDIF
LDR r0, [r0]
STR r1, [r0] ; update from thread stack pointer
@ -122,10 +134,15 @@ swtich_to_thread
LDR r1, [r1]
LDR r1, [r1] ; load thread stack pointer
IF {FPU} != "SoftVFP"
LDMFD r1!, {r3} ; pop flag
ENDIF
LDMFD r1!, {r4 - r11} ; pop r4 - r11 register
IF {FPU} != "SoftVFP"
VLDMFD r1!, {d8 - d15} ; pop FPU register s16~s31
CMP r3, #0 ; if(flag_r3 != 0)
VLDMFDNE r1!, {d8 - d15} ; pop FPU register s16~s31
ENDIF
MSR psp, r1 ; update stack pointer
@ -134,6 +151,12 @@ pendsv_exit
; restore interrupt
MSR PRIMASK, r2
IF {FPU} != "SoftVFP"
ORR lr, lr, #0x10 ; lr |= (1 << 4), clean FPCA.
CMP r3, #0 ; if(flag_r3 != 0)
BICNE lr, lr, #0x10 ; lr &= ~(1 << 4), set FPCA.
ENDIF
ORR lr, lr, #0x04
BX lr
ENDP
@ -149,6 +172,13 @@ rt_hw_context_switch_to PROC
LDR r1, =rt_interrupt_to_thread
STR r0, [r1]
IF {FPU} != "SoftVFP"
; CLEAR CONTROL.FPCA
MRS r2, CONTROL ; read
BIC r2, #0x04 ; modify
MSR CONTROL, r2 ; write-back
ENDIF
; set from thread to 0
LDR r1, =rt_interrupt_from_thread
MOV r0, #0x0

58
libcpu/arm/cortex-m4/cpuport.c
View File

@ -16,6 +16,7 @@
* 2012-12-11 lgnq fixed the coding style.
* 2012-12-23 aozima stack addr align to 8byte.
* 2012-12-29 Bernard Add exception hook.
* 2013-06-23 aozima support lazy stack optimized.
*/
#include <rtthread.h>
@ -32,6 +33,37 @@ rt_uint32_t rt_thread_switch_interrupt_flag;
static rt_err_t (*rt_exception_hook)(void *context) = RT_NULL;
struct exception_stack_frame
{
rt_uint32_t r0;
rt_uint32_t r1;
rt_uint32_t r2;
rt_uint32_t r3;
rt_uint32_t r12;
rt_uint32_t lr;
rt_uint32_t pc;
rt_uint32_t psr;
};
struct stack_frame
{
#if USE_FPU
rt_uint32_t flag;
#endif /* USE_FPU */
/* r4 ~ r11 register */
rt_uint32_t r4;
rt_uint32_t r5;
rt_uint32_t r6;
rt_uint32_t r7;
rt_uint32_t r8;
rt_uint32_t r9;
rt_uint32_t r10;
rt_uint32_t r11;
struct exception_stack_frame exception_stack_frame;
};
struct exception_stack_frame_fpu
{
rt_uint32_t r0;
rt_uint32_t r1;
@ -65,8 +97,10 @@ struct exception_stack_frame
#endif
};
struct stack_frame
struct stack_frame_fpu
{
rt_uint32_t flag;
/* r4 ~ r11 register */
rt_uint32_t r4;
rt_uint32_t r5;
@ -97,7 +131,7 @@ struct stack_frame
rt_uint32_t s31;
#endif
struct exception_stack_frame exception_stack_frame;
struct exception_stack_frame_fpu exception_stack_frame;
};
rt_uint8_t *rt_hw_stack_init(void *tentry,
@ -130,6 +164,10 @@ rt_uint8_t *rt_hw_stack_init(void *tentry,
stack_frame->exception_stack_frame.pc = (unsigned long)tentry; /* entry point, pc */
stack_frame->exception_stack_frame.psr = 0x01000000L; /* PSR */
#if USE_FPU
stack_frame->flag = 0;
#endif /* USE_FPU */
/* return task's current stack address */
return stk;
}
@ -141,20 +179,20 @@ rt_uint8_t *rt_hw_stack_init(void *tentry,
*/
void rt_hw_exception_install(rt_err_t (*exception_handle)(void* context))
{
rt_exception_hook = exception_handle;
rt_exception_hook = exception_handle;
}
void rt_hw_hard_fault_exception(struct exception_stack_frame *exception_stack)
{
extern long list_thread(void);
extern long list_thread(void);
if (rt_exception_hook != RT_NULL)
{
rt_err_t result;
if (rt_exception_hook != RT_NULL)
{
rt_err_t result;
result = rt_exception_hook(exception_stack);
if (result == RT_EOK) return;
}
result = rt_exception_hook(exception_stack);
if (result == RT_EOK) return;
}
rt_kprintf("psr: 0x%08x\n", exception_stack->psr);
rt_kprintf(" pc: 0x%08x\n", exception_stack->pc);