48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/*
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* contains the implementation of all syscalls.
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*/
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#include <stdint.h>
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#include <errno.h>
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#include "util/types.h"
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#include "syscall.h"
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#include "string.h"
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#include "process.h"
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#include "util/functions.h"
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#include "spike_interface/spike_utils.h"
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//
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// implement the SYS_user_print syscall
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//
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ssize_t sys_user_print(const char* buf, size_t n) {
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sprint(buf);
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return 0;
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}
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//
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// implement the SYS_user_exit syscall
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//
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ssize_t sys_user_exit(uint64 code) {
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sprint("User exit with code:%d.\n", code);
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// in lab1, PKE considers only one app (one process).
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// therefore, shutdown the system when the app calls exit()
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shutdown(code);
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}
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//
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// [a0]: the syscall number; [a1] ... [a7]: arguments to the syscalls.
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// returns the code of success, (e.g., 0 means success, fail for otherwise)
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//
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long do_syscall(long a0, long a1, long a2, long a3, long a4, long a5, long a6, long a7) {
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switch (a0) {
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case SYS_user_print:
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return sys_user_print((const char*)a1, a2);
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case SYS_user_exit:
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return sys_user_exit(a1);
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default:
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panic("Unknown syscall %ld \n", a0);
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}
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}
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