102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
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#include <unistd.h>
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#include <proc.h>
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#include <syscall.h>
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#include <trap.h>
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#include <stdio.h>
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#include <pmm.h>
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#include <assert.h>
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static int
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sys_exit(uint32_t arg[]) {
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int error_code = (int)arg[0];
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return do_exit(error_code);
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}
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static int
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sys_fork(uint32_t arg[]) {
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struct trapframe *tf = current->tf;
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uintptr_t stack = tf->tf_esp;
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return do_fork(0, stack, tf);
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}
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static int
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sys_wait(uint32_t arg[]) {
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int pid = (int)arg[0];
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int *store = (int *)arg[1];
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return do_wait(pid, store);
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}
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static int
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sys_exec(uint32_t arg[]) {
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const char *name = (const char *)arg[0];
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size_t len = (size_t)arg[1];
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unsigned char *binary = (unsigned char *)arg[2];
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size_t size = (size_t)arg[3];
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return do_execve(name, len, binary, size);
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}
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static int
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sys_yield(uint32_t arg[]) {
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return do_yield();
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}
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static int
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sys_kill(uint32_t arg[]) {
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int pid = (int)arg[0];
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return do_kill(pid);
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}
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static int
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sys_getpid(uint32_t arg[]) {
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return current->pid;
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}
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static int
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sys_putc(uint32_t arg[]) {
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int c = (int)arg[0];
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cputchar(c);
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return 0;
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}
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static int
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sys_pgdir(uint32_t arg[]) {
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print_pgdir();
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return 0;
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}
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static int (*syscalls[])(uint32_t arg[]) = {
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[SYS_exit] sys_exit,
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[SYS_fork] sys_fork,
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[SYS_wait] sys_wait,
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[SYS_exec] sys_exec,
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[SYS_yield] sys_yield,
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[SYS_kill] sys_kill,
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[SYS_getpid] sys_getpid,
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[SYS_putc] sys_putc,
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[SYS_pgdir] sys_pgdir,
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};
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#define NUM_SYSCALLS ((sizeof(syscalls)) / (sizeof(syscalls[0])))
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void
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syscall(void) {
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struct trapframe *tf = current->tf;
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uint32_t arg[5];
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int num = tf->tf_regs.reg_eax;
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if (num >= 0 && num < NUM_SYSCALLS) {
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if (syscalls[num] != NULL) {
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arg[0] = tf->tf_regs.reg_edx;
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arg[1] = tf->tf_regs.reg_ecx;
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arg[2] = tf->tf_regs.reg_ebx;
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arg[3] = tf->tf_regs.reg_edi;
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arg[4] = tf->tf_regs.reg_esi;
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tf->tf_regs.reg_eax = syscalls[num](arg);
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return ;
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}
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}
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print_trapframe(tf);
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panic("undefined syscall %d, pid = %d, name = %s.\n",
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num, current->pid, current->name);
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}
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