《操作系统》的实验代码。
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#include <defs.h>
#include <unistd.h>
#include <proc.h>
#include <syscall.h>
#include <trap.h>
#include <stdio.h>
#include <pmm.h>
#include <assert.h>
#include <clock.h>
#include <stat.h>
#include <dirent.h>
#include <sysfile.h>
static int
sys_exit(uint32_t arg[]) {
int error_code = (int)arg[0];
return do_exit(error_code);
}
static int
sys_fork(uint32_t arg[]) {
struct trapframe *tf = current->tf;
uintptr_t stack = tf->tf_esp;
return do_fork(0, stack, tf);
}
static int
sys_wait(uint32_t arg[]) {
int pid = (int)arg[0];
int *store = (int *)arg[1];
return do_wait(pid, store);
}
static int
sys_exec(uint32_t arg[]) {
const char *name = (const char *)arg[0];
int argc = (int)arg[1];
const char **argv = (const char **)arg[2];
return do_execve(name, argc, argv);
}
static int
sys_yield(uint32_t arg[]) {
return do_yield();
}
static int
sys_kill(uint32_t arg[]) {
int pid = (int)arg[0];
return do_kill(pid);
}
static int
sys_getpid(uint32_t arg[]) {
return current->pid;
}
static int
sys_putc(uint32_t arg[]) {
int c = (int)arg[0];
cputchar(c);
return 0;
}
static int
sys_pgdir(uint32_t arg[]) {
print_pgdir();
return 0;
}
static uint32_t
sys_gettime(uint32_t arg[]) {
return (int)ticks;
}
static uint32_t
sys_lab6_set_priority(uint32_t arg[])
{
uint32_t priority = (uint32_t)arg[0];
lab6_set_priority(priority);
return 0;
}
static int
sys_sleep(uint32_t arg[]) {
unsigned int time = (unsigned int)arg[0];
return do_sleep(time);
}
static int
sys_open(uint32_t arg[]) {
const char *path = (const char *)arg[0];
uint32_t open_flags = (uint32_t)arg[1];
return sysfile_open(path, open_flags);
}
static int
sys_close(uint32_t arg[]) {
int fd = (int)arg[0];
return sysfile_close(fd);
}
static int
sys_read(uint32_t arg[]) {
int fd = (int)arg[0];
void *base = (void *)arg[1];
size_t len = (size_t)arg[2];
return sysfile_read(fd, base, len);
}
static int
sys_write(uint32_t arg[]) {
int fd = (int)arg[0];
void *base = (void *)arg[1];
size_t len = (size_t)arg[2];
return sysfile_write(fd, base, len);
}
static int
sys_seek(uint32_t arg[]) {
int fd = (int)arg[0];
off_t pos = (off_t)arg[1];
int whence = (int)arg[2];
return sysfile_seek(fd, pos, whence);
}
static int
sys_fstat(uint32_t arg[]) {
int fd = (int)arg[0];
struct stat *stat = (struct stat *)arg[1];
return sysfile_fstat(fd, stat);
}
static int
sys_fsync(uint32_t arg[]) {
int fd = (int)arg[0];
return sysfile_fsync(fd);
}
static int
sys_getcwd(uint32_t arg[]) {
char *buf = (char *)arg[0];
size_t len = (size_t)arg[1];
return sysfile_getcwd(buf, len);
}
static int
sys_getdirentry(uint32_t arg[]) {
int fd = (int)arg[0];
struct dirent *direntp = (struct dirent *)arg[1];
return sysfile_getdirentry(fd, direntp);
}
static int
sys_dup(uint32_t arg[]) {
int fd1 = (int)arg[0];
int fd2 = (int)arg[1];
return sysfile_dup(fd1, fd2);
}
static int (*syscalls[])(uint32_t arg[]) = {
[SYS_exit] sys_exit,
[SYS_fork] sys_fork,
[SYS_wait] sys_wait,
[SYS_exec] sys_exec,
[SYS_yield] sys_yield,
[SYS_kill] sys_kill,
[SYS_getpid] sys_getpid,
[SYS_putc] sys_putc,
[SYS_pgdir] sys_pgdir,
[SYS_gettime] sys_gettime,
[SYS_lab6_set_priority] sys_lab6_set_priority,
[SYS_sleep] sys_sleep,
[SYS_open] sys_open,
[SYS_close] sys_close,
[SYS_read] sys_read,
[SYS_write] sys_write,
[SYS_seek] sys_seek,
[SYS_fstat] sys_fstat,
[SYS_fsync] sys_fsync,
[SYS_getcwd] sys_getcwd,
[SYS_getdirentry] sys_getdirentry,
[SYS_dup] sys_dup,
};
#define NUM_SYSCALLS ((sizeof(syscalls)) / (sizeof(syscalls[0])))
void
syscall(void) {
struct trapframe *tf = current->tf;
uint32_t arg[5];
int num = tf->tf_regs.reg_eax;
if (num >= 0 && num < NUM_SYSCALLS) {
if (syscalls[num] != NULL) {
arg[0] = tf->tf_regs.reg_edx;
arg[1] = tf->tf_regs.reg_ecx;
arg[2] = tf->tf_regs.reg_ebx;
arg[3] = tf->tf_regs.reg_edi;
arg[4] = tf->tf_regs.reg_esi;
tf->tf_regs.reg_eax = syscalls[num](arg);
return ;
}
}
print_trapframe(tf);
panic("undefined syscall %d, pid = %d, name = %s.\n",
num, current->pid, current->name);
}