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fixed error in goto_user_mode function

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stnolting 2020-08-03 21:42:30 +02:00
parent b034d734dd
commit e1fac4d070
1 changed files with 2 additions and 3 deletions
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5
sw/lib/source/neorv32_cpu.c
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@ -242,15 +242,14 @@ void neorv32_cpu_delay_ms(uint32_t time_ms) {
* Switch from privilege mode MACHINE to privilege mode USER.
*
* @note This function requires the U extension to be implemented.
* @note Maybe you should do a fencei after this.
* @note Maybe you should do a fence.i after this.
**************************************************************************/
void __attribute__((naked)) neorv32_cpu_goto_user_mode(void) {
register uint32_t mask = (1<<CPU_MSTATUS_MPP_H) | (1<<CPU_MSTATUS_MPP_L);
mask = ~mask;
asm volatile ("csrrc zero, mstatus, %[input_j]" : : [input_j] "r" (mask));
// return and switch to user mode
// return switching to user mode
asm volatile ("csrw mepc, ra");
asm volatile ("mret");
}