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/**
* @file svc.c
* An unused handler for SVC calls
* TODO: use SVC calls, possibly allowing for switch to unprivileged mode?
*
* Copyright (C) 2018 Clyne Sullivan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include "gpio.h"
#include "clock.h"
#include "task.h"
extern void gpio_svc(uint32_t *);
extern void clock_svc(uint32_t *);
extern void task_svc(uint32_t *);
void svc_handler(uint32_t *args)
{
/*uint32_t*/int svc_number = ((char *)args[6])[-2];
switch (svc_number) {
case -1:
case 0:
_exit(args[0]);
break;
case 1:
gpio_svc(args);
break;
case 2:
clock_svc(args);
break;
case 3:
task_svc(args);
asm("mov r0, %0" :: "r" (args[0]));
break;
default:
break;
}
}
void SVC_Handler(void) {
uint32_t *args;
asm("\
tst lr, #4; \
ite eq; \
mrseq %0, msp; \
mrsne %0, psp; \
" : "=r" (args));
svc_handler(args);
}
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