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#include "kernel/syscall.h"
#include "common/types.h"
#include "kernel/proc.h"
#include "kernel/riscv.h"
#include "drivers/uart.h"
#include "drivers/virtio.h"
#include "kernel/timer.h"
#include "kernel/mm.h"
#include "kernel/trap.h"
extern "C++" int fork();
namespace ProcManager
{
void exit(int status);
int wait(uint64_t addr);
}
static uint64_t argraw(int n)
{
Proc *p = myproc();
switch (n)
{
case 0:
return p->tf->a0;
case 1:
return p->tf->a1;
case 2:
return p->tf->a2;
case 3:
return p->tf->a3;
case 4:
return p->tf->a4;
case 5:
return p->tf->a5;
default:
return static_cast<uint64_t>(-1);
}
}
static int argint(int n, int *ip)
{
*ip = static_cast<int>(argraw(n));
return 0;
}
static uint64_t sys_exit()
{
int n;
if (argint(0, &n) < 0)
return static_cast<uint64_t>(-1);
ProcManager::exit(n);
return 0;
}
static uint64_t sys_fork()
{
return static_cast<uint64_t>(fork());
}
static uint64_t sys_wait()
{
uint64_t p = argraw(0);
return static_cast<uint64_t>(ProcManager::wait(p));
}
static uint64_t sys_getpid()
{
return static_cast<uint64_t>(myproc()->pid);
}
static uint64_t sys_putc()
{
char c = static_cast<char>(argraw(0));
Drivers::uart_putc(c);
return 0;
}
static uint64_t sys_write()
{
int fd;
int n;
uint64_t p;
if (argint(0, &fd) < 0 || argint(2, &n) < 0)
return static_cast<uint64_t>(-1);
p = argraw(1);
// Drivers::uart_puts("DEBUG: sys_write fd=");
// Drivers::uart_put_int(fd);
// Drivers::uart_puts(" len=");
// Drivers::uart_put_int(n);
// Drivers::uart_puts("\n");
if (fd == 1) // stdout
{
Proc *proc = myproc();
constexpr int MAX_WRITE_BUF = 128;
char buf[MAX_WRITE_BUF];
int i = 0;
while (i < n)
{
int len = n - i;
if (len > MAX_WRITE_BUF)
len = MAX_WRITE_BUF;
if (VM::copyin(proc->pagetable, buf, p + i, static_cast<uint64_t>(len)) < 0)
{
Drivers::uart_puts("sys_write: copyin failed\n");
return static_cast<uint64_t>(-1);
}
for (int j = 0; j < len; j++)
{
Drivers::uart_putc(buf[j]);
}
i += len;
}
return static_cast<uint64_t>(n);
}
return static_cast<uint64_t>(-1);
}
static uint64_t sys_read()
{
int fd;
int n;
uint64_t p;
// get param: fd, buf, len
if (argint(0, &fd) < 0 || argint(2, &n) < 0)
return -1;
p = argraw(1);
if (fd == 0) // stdin
{
return Drivers::console_read(p, n);
}
return -1;
}
static uint64_t sys_sbrk()
{
int n;
if (argint(0, &n) < 0)
return -1;
uint64_t addr = myproc()->sz;
if (ProcManager::growproc(n) < 0)
return -1;
return addr;
}
static uint64_t sys_disk_test()
{
VirtIO::test_rw();
return 0;
}
void syscall()
{
Proc *p = myproc();
int num = p->tf->a7;
uint64_t ret = static_cast<uint64_t>(-1);
/* Just For Debug */
// Drivers::uart_puts("Syscall: ");
// Drivers::print_hex(num);
// Drivers::uart_puts("\n");
switch (num)
{
case SYS_write:
ret = sys_write();
break;
case SYS_read:
ret = sys_read();
break;
case SYS_putc:
ret = sys_putc();
break;
case SYS_fork:
ret = sys_fork();
break;
case SYS_exit:
ret = sys_exit();
break;
case SYS_wait:
ret = sys_wait();
break;
case SYS_getpid:
ret = sys_getpid();
break;
case SYS_sbrk:
ret = sys_sbrk();
break;
case SYS_disk_test:
ret = sys_disk_test();
break;
default:
Drivers::uart_puts("Unknown Syscall ID: ");
Drivers::print_hex(num);
Drivers::uart_puts("\n");
ret = static_cast<uint64_t>(-1);
break;
}
p->tf->a0 = ret;
}
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