Pintos - Project 2 (for push)

#include "userprog/syscall.h"
#include <stdio.h>
#include <syscall-nr.h>
#include "threads/interrupt.h"
#include "threads/thread.h"
#include "devices/shutdown.h"
#include "userprog/pagedir.h"
#include "filesys/filesys.h"
#include "threads/vaddr.h"

static void syscall_handler(struct intr_frame *);

typedef void syscall_fun(struct intr_frame *, uint32_t *);

bool check_ptr(char *ptr);

/* Projects 2 and later. */
syscall_fun call_SYS_HALT, call_SYS_EXIT, call_SYS_EXEC, call_SYS_WAIT, call_SYS_CREATE,
    call_SYS_REMOVE, call_SYS_OPEN, call_SYS_FILESIZE, call_SYS_READ, call_SYS_WRITE,
    call_SYS_SEEK, call_SYS_TELL, call_SYS_CLOSE, call_SYS_PRACTICE;

/* Project 3 and optionally project 4. */
syscall_fun call_SYS_MMAP, call_SYS_MUNMAP;

/* Project 4 only. */
syscall_fun call_SYS_CHDIR, call_SYS_MKDIR, call_SYS_READDIR, call_SYS_ISDIR, call_SYS_INUMBER;

/* System Call struct */
typedef struct fun_desc
{
  syscall_fun *fun;
} fun_desc;

/* System call lookup table */
fun_desc sys_call_table[] = {
    {call_SYS_HALT},
    {call_SYS_EXIT},
    {call_SYS_EXEC},
    {call_SYS_WAIT},
    {call_SYS_CREATE},
    {call_SYS_REMOVE},
    {call_SYS_OPEN},
    {call_SYS_FILESIZE},
    {call_SYS_READ},
    {call_SYS_WRITE},
    {call_SYS_SEEK},
    {call_SYS_TELL},
    {call_SYS_CLOSE},
    {call_SYS_PRACTICE},
    {call_SYS_MMAP},
    {call_SYS_MUNMAP},
    {call_SYS_CHDIR},
    {call_SYS_MKDIR},
    {call_SYS_READDIR},
    {call_SYS_ISDIR},
    {call_SYS_INUMBER},
};

void syscall_init(void)
{
  intr_register_int(0x30, 3, INTR_ON, syscall_handler, "syscall");
}

static void
syscall_handler(struct intr_frame *f UNUSED)
{
  uint32_t *args = ((uint32_t *)f->esp);
  int SC_NO = args[0];

  if (!(0 <= SC_NO && SC_NO <= SYS_INUMBER))
  {

    printf("Error: System call out of boundaries. SC_NO = %d\n", SC_NO);
    return;
  }
  sys_call_table[SC_NO].fun(f, args);
}

/* System Call Implementations */
void call_SYS_HALT(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  shutdown_power_off();
  return;
}

void call_SYS_EXIT(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  f->eax = args[1];
  printf("%s: exit(%d)\n", thread_current()->name, args[1]);
  thread_exit();
}

void call_SYS_EXEC(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  // TODO Project 2
  return;
}

void call_SYS_WAIT(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  // TODO Project 2
  return;
}

void call_SYS_CREATE(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  /* Arguments */
  char *file_name = (char *)args[1];
  int file_size = (int)args[2];

  /* check fo valid pointer */
  if (!check_ptr(file_name))
  {
    args[1] = -1;
    call_SYS_EXIT(f, args);
    return;
  }

  /* return value */
  f->eax = filesys_create(file_name, file_size);
}

void call_SYS_REMOVE(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  // TODO Project 2
  return;
}

void call_SYS_OPEN(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  // TODO Project 2
  return;
}

void call_SYS_FILESIZE(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  // TODO Project 2
  return;
}

void call_SYS_READ(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  // TODO Project 2
  f->eax = 1000;
  return;
}

void call_SYS_WRITE(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  /* Arguments */
  int fd = args[1];
  void *buffer = (void *)args[2];
  int size = args[3];

  /* write in buffer */
  putbuf(buffer, size);

  /* save return value */
  f->eax = size;
}

void call_SYS_SEEK(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  // TODO Project 2
  return;
}

void call_SYS_TELL(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  // TODO Project 2
  return;
}

void call_SYS_CLOSE(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  // TODO Project 2
  return;
}

void call_SYS_PRACTICE(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  /* Arguments */
  int practice = args[1];

  practice += 1;

  /* return value */
  f->eax = practice;
  return;
}

void call_SYS_MMAP(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  return;
}

void call_SYS_MUNMAP(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  return;
}

void call_SYS_CHDIR(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  return;
}

void call_SYS_MKDIR(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  return;
}

void call_SYS_READDIR(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  return;
}

void call_SYS_ISDIR(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  return;
}

void call_SYS_INUMBER(struct intr_frame *f UNUSED, uint32_t *args UNUSED)
{
  return;
}

/* checks given pointer whether it's valid or not */
bool check_ptr(char *ptr)
{
  if (pagedir_get_page(thread_current()->pagedir, ptr) == NULL || !is_user_vaddr(ptr))
  {
    return false;
  }
  return true;
}