diff options
Diffstat (limited to 'os/rt')
-rw-r--r-- | os/rt/ports/ARMCMx/chcore_v7m.c | 62 | ||||
-rw-r--r-- | os/rt/ports/ARMCMx/chcore_v7m.h | 8 |
2 files changed, 29 insertions, 41 deletions
diff --git a/os/rt/ports/ARMCMx/chcore_v7m.c b/os/rt/ports/ARMCMx/chcore_v7m.c index 29add3fb1..518d162b9 100644 --- a/os/rt/ports/ARMCMx/chcore_v7m.c +++ b/os/rt/ports/ARMCMx/chcore_v7m.c @@ -60,21 +60,21 @@ * @note The PendSV vector is only used in advanced kernel mode.
*/
void SVC_Handler(void) {
+ struct port_extctx *ctxp;
+
+#if CORTEX_USE_FPU
+ /* Enforcing unstacking of the FP part of the context.*/
+ SCB_FPCCR &= ~FPCCR_LSPACT;
+#endif
/* The port_extctx structure is pointed by the PSP register.*/
- struct port_extctx *ctxp = (struct port_extctx *)__get_PSP();
+ ctxp = (struct port_extctx *)__get_PSP();
/* Discarding the current exception context and positioning the stack to
point to the real one.*/
ctxp++;
-#if CORTEX_USE_FPU
- /* Restoring the special register FPCCR.*/
- FPU->FPCCR = (uint32_t)ctxp->fpccr;
- FPU->FPCAR = FPU->FPCAR + sizeof (struct port_extctx);
-#endif
-
- /* Writing back the modified PSP value.*/
+ /* Restoring real position of the original stack frame.*/
__set_PSP((uint32_t)ctxp);
/* Restoring the normal interrupts status.*/
@@ -90,20 +90,20 @@ void SVC_Handler(void) { * @note The PendSV vector is only used in compact kernel mode.
*/
void PendSV_Handler(void) {
+ struct port_extctx *ctxp;
+
+#if CORTEX_USE_FPU
+ /* Enforcing unstacking of the FP part of the context.*/
+ SCB_FPCCR &= ~FPCCR_LSPACT;
+#endif
/* The port_extctx structure is pointed by the PSP register.*/
- struct port_extctx *ctxp = (struct port_extctx *)__get_PSP();
+ ctxp = (struct port_extctx *)__get_PSP();
/* Discarding the current exception context and positioning the stack to
point to the real one.*/
ctxp++;
-#if CORTEX_USE_FPU
- /* Restoring the special register FPCCR.*/
- FPU->FPCCR = (uint32_t)ctxp->fpccr;
- FPU->FPCAR = FPU->FPCAR + sizeof (struct port_extctx);
-#endif
-
/* Writing back the modified PSP value.*/
__set_PSP((uint32_t)ctxp);
}
@@ -120,29 +120,31 @@ void _port_irq_epilogue(void) { port_lock_from_isr();
if ((SCB->ICSR & SCB_ICSR_RETTOBASE_Msk) != 0) {
+ struct port_extctx *ctxp;
+
+#if CORTEX_USE_FPU
+ /* Enforcing a lazy FPU state save by accessing the FPCSR register.*/
+ (void) __get_FPSCR();
+#endif
/* The port_extctx structure is pointed by the PSP register.*/
- struct port_extctx *ctxp = (struct port_extctx *)__get_PSP();
+ ctxp = (struct port_extctx *)__get_PSP();
/* Adding an artificial exception return context, there is no need to
populate it fully.*/
ctxp--;
- /* Writing back the modified PSP value.*/
- __set_PSP((uint32_t)ctxp);
-
/* Setting up a fake XPSR register value.*/
ctxp->xpsr = (regarm_t)0x01000000;
+ /* Writing back the modified PSP value.*/
+ __set_PSP((uint32_t)ctxp);
+
/* The exit sequence is different depending on if a preemption is
required or not.*/
if (chSchIsPreemptionRequired()) {
/* Preemption is required we need to enforce a context switch.*/
ctxp->pc = (regarm_t)_port_switch_from_isr;
-#if CORTEX_USE_FPU
- /* Enforcing a lazy FPU state save by accessing the FPCSR register.*/
- (void) __get_FPSCR();
-#endif
}
else {
/* Preemption not required, we just need to exit the exception
@@ -150,20 +152,6 @@ void _port_irq_epilogue(void) { ctxp->pc = (regarm_t)_port_exit_from_isr;
}
-#if CORTEX_USE_FPU
- {
- uint32_t fpccr;
-
- /* Saving the special register SCB_FPCCR into the reserved offset of
- the Cortex-M4 exception frame.*/
- (ctxp + 1)->fpccr = (regarm_t)(fpccr = FPU->FPCCR);
-
- /* Now the FPCCR is modified in order to not restore the FPU status
- from the artificial return context.*/
- FPU->FPCCR = fpccr | FPU_FPCCR_LSPACT_Msk;
- }
-#endif
-
/* Note, returning without unlocking is intentional, this is done in
order to keep the rest of the context switch atomic.*/
return;
diff --git a/os/rt/ports/ARMCMx/chcore_v7m.h b/os/rt/ports/ARMCMx/chcore_v7m.h index da24783e7..9dc1a5e92 100644 --- a/os/rt/ports/ARMCMx/chcore_v7m.h +++ b/os/rt/ports/ARMCMx/chcore_v7m.h @@ -238,7 +238,7 @@ struct port_extctx { regarm_t s14;
regarm_t s15;
regarm_t fpscr;
- regarm_t fpccr;
+ regarm_t reserved;
#endif /* CORTEX_USE_FPU */
};
@@ -396,12 +396,12 @@ static inline void port_init(void) { * @return The interrupts status.
*/
static inline syssts_t port_get_irq_status(void) {
- syssts_t sts;
+ uint32_t sts;
#if !CORTEX_SIMPLIFIED_PRIORITY
- sts = (syssts_t)__get_BASEPRI();
+ sts = __get_BASEPRI();
#else /* CORTEX_SIMPLIFIED_PRIORITY */
- sts = (syssts_t)__get_PRIMASK();
+ sts = __get_PRIMASK();
#endif /* CORTEX_SIMPLIFIED_PRIORITY */
return sts;
}
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