《操作系统》的实验代码。
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#include <unistd.h>
#include <proc.h>
#include <syscall.h>
#include <trap.h>
#include <stdio.h>
#include <pmm.h>
#include <assert.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];
size_t len = (size_t)arg[1];
unsigned char *binary = (unsigned char *)arg[2];
size_t size = (size_t)arg[3];
return do_execve(name, len, binary, size);
}
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 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,
};
#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);
}