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