nmi_exception.c

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#include <stdint.h>
 
#include "ra8_attributes.h"
#include "ra8_exception.h"
#include "ra8_icu_regs.h"

RA8_INTERNAL [[noreturn, gnu::used]] static void
internal_nmi_report(const ra8_exception_frame_t* frame);
RA8_INTERNAL [[noreturn, gnu::used]] static void
internal_nmi_report(const ra8_exception_frame_t* frame)
{
  /* HUM Ch 14.2.13 "NMISR : Non-Maskable Interrupt Status Register" p 536-540 */
  const uint32_t nmisr = *ra8_icu_nmisr();
  ra8_exception_report_nmi(frame, nmisr);
}

void                          NMI_Handler(void);
[[gnu::naked, noreturn]] void NMI_Handler(void)
{
  __asm__ volatile("tst lr, #4          \n"
                   "ite eq              \n"
                   "mrseq r0, msp       \n"
                   "mrsne r0, psp       \n"
                   "b     internal_nmi_report\n");
}