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arch: arm: aarch32: Fix incorrect z_arm_{int,exc}_exit usage

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In the ARM Cortex-M architecture implementation, the concepts of
"exceptions" and "interrupts" are interchangeable; whereas, in the
Cortex-A/-R architecture implementation, they are considered separate
and therefore handled differently (i.e. `z_arm_exc_exit` cannot be used
to exit an "interrupt").

This commit fixes all `z_arm_exc_exit` usages in the interrupt handlers
to use `z_arm_int_exit`.

NOTE: In terms of the ARM AArch32 Cortex-A and Cortex-R architecture
      implementations, the "exceptions" refer to the "Undefined
      Instruction (UNDEF)" and "Prefetch/Data Abort (PABT/DABT)"
      exceptions, while "interrupts" refer to the "Interrupt (IRQ)",
      "Fast Interrupt (FIQ)" and "Software Interrupt/Supervisor Call
      (SWI/SVC)".

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit is contained in:
Stephanos Ioannidis 2020-04-08 15:17:32 +09:00 • committed by Carles Cufí
commit c442203c08
2 changed files with 2 additions and 4 deletions
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2
arch/arm/core/aarch32/nmi.c
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@ -91,5 +91,5 @@ void z_NmiHandlerSet(void (*pHandler)(void))
void z_arm_nmi(void)
{
handler();
z_arm_exc_exit();
z_arm_int_exit();
}

4
drivers/timer/cortex_m_systick.c
View file

@ -8,8 +8,6 @@
#include <spinlock.h>
#include <arch/arm/aarch32/cortex_m/cmsis.h>
void z_arm_exc_exit(void);
#define COUNTER_MAX 0x00ffffff
#define TIMER_STOPPED 0xff000000
@ -148,7 +146,7 @@ void z_clock_isr(void *arg)
} else {
z_clock_announce(1);
}
z_arm_exc_exit();
z_arm_int_exit();
}
int z_clock_driver_init(struct device *device)