void syscall_linux(void) {
assert(current != NULL);
struct trapframe *tf = current->tf;
uint32_t arg[6];
int num = tf->tf_regs.reg_r[MIPS_REG_V0] - 4000;
if (num >= 0 && num < 1000) {
if (linux_syscall_table[num] != NULL) {
arg[0] = tf->tf_regs.reg_r[MIPS_REG_A0];
arg[1] = tf->tf_regs.reg_r[MIPS_REG_A1];
arg[2] = tf->tf_regs.reg_r[MIPS_REG_A2];
arg[3] = tf->tf_regs.reg_r[MIPS_REG_A3];
uint32_t* stack_pointor = tf->tf_regs.reg_r[MIPS_REG_SP];
arg[4] = stack_pointor[4];
arg[5] = stack_pointor[5];
//kprintf("MIPS_sys $%d $%d\n", current->pid, num);
//TODO: 0 indicates that syscall always suceeded, not reasonable but seems
//It works. Need to be set before syscall because fork won't return.
if(num == __NR_pipe) {
int fd[2];
if(file_pipe(fd) != 0) {
tf->tf_regs.reg_r[MIPS_REG_A3] = 1;
}
else {
tf->tf_regs.reg_r[MIPS_REG_A3] = 0;
tf->tf_regs.reg_r[MIPS_REG_V0] = fd[0];
tf->tf_regs.reg_r[MIPS_REG_V1] = fd[1];
kprintf("pipe %d %d\n", fd[0], fd[1]);
}
}
else {
tf->tf_regs.reg_r[MIPS_REG_A3] = 0;
tf->tf_regs.reg_r[MIPS_REG_V0] = linux_syscall_table[num] (arg);
}
/*if(num == __NR_read || num == __NR_write) {
if(((int)tf->tf_regs.reg_r[MIPS_REG_V0]) < 0) {
tf->tf_regs.reg_r[MIPS_REG_A3] = 1;
}
}*/
return;
}
}
print_trapframe(tf);
panic("Undefined Linux OABI syscall %d, pid = %d, name = %s.\n",
num, current->pid, current->name);
}
int
sysfile_pipe(int *fd_store) {
struct mm_struct *mm = current->mm;
int ret, fd[2];
if (!user_mem_check(mm, (uintptr_t)fd_store, sizeof(fd), 1)) {
return -E_INVAL;
}
if ((ret = file_pipe(fd)) == 0) {
lock_mm(mm);
{
if (!copy_to_user(mm, fd_store, fd, sizeof(fd))) {
ret = -E_INVAL;
}
}
unlock_mm(mm);
if (ret != 0) {
file_close(fd[0]), file_close(fd[1]);
}
}
return ret;
}
