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fe310: Only retrieve mepc and mtval on exception

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This commit is contained in:
Koen Zandberg 2020-08-27 00:41:02 +02:00
parent 503806cbb3
commit acf948a296
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GPG Key ID: 0895A893E6D2985B
1 changed files with 4 additions and 10 deletions
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14
cpu/fe310/irq_arch.c
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@ -97,12 +97,8 @@ void external_isr(void)
/**
* @brief Global trap and interrupt handler
*/
int handle_trap(unsigned int mcause, unsigned int mepc, unsigned int mtval)
int handle_trap(unsigned int mcause)
{
#ifndef DEVELHELP
(void) mepc;
(void) mtval;
#endif
int res = 0;
/* Tell RIOT to set sched_context_switch_request instead of
* calling thread_yield(). */
@ -139,8 +135,8 @@ int handle_trap(unsigned int mcause, unsigned int mepc, unsigned int mtval)
#ifdef DEVELHELP
printf("Unhandled trap:\n");
printf(" mcause: 0x%08x\n", mcause);
printf(" mepc: 0x%08x\n", mepc);
printf(" mtval: 0x%08x\n", mtval);
printf(" mepc: 0x%"PRIx32"\n", read_csr(mepc));
printf(" mtval: 0x%"PRIx32"\n", read_csr(mtval));
#endif
/* Unknown trap */
core_panic(PANIC_GENERAL_ERROR, "Unhandled trap");
@ -194,9 +190,7 @@ static void __attribute((aligned(4))) __attribute__((interrupt)) trap_entry(void
/* Get the interrupt cause, PC and trap vector */
"csrr a0, mcause \n"
"csrr a1, mepc \n"
"csrr a2, mtval \n"
/* Call trap handler */
/* Call trap handler, a0 contains the return value */
"call handle_trap \n"
/* Move stack pointer back */