int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
unsigned long unused,
struct task_struct * p, struct pt_regs * regs)
{
struct pt_regs * childregs;
long childksp;
extern void save_fp(void*);
childksp = (unsigned long)p + KERNEL_STACK_SIZE - 32;
if (last_task_used_math == current)
if (mips_cpu.options & MIPS_CPU_FPU) {
__enable_fpu();
save_fp(p);
}
/* set up new TSS. */
childregs = (struct pt_regs *) childksp - 1;
*childregs = *regs;
set_gpreg(childregs, 7, 0); /* Clear error flag */
if(current->personality == PER_LINUX) {
set_gpreg(childregs, 2, 0); /* Child gets zero as return value */
set_gpreg(regs, 2, p->pid);
} else {
/* Under IRIX things are a little different. */
set_gpreg(childregs, 2, 0);
set_gpreg(childregs, 3, 1);
set_gpreg(regs, 2, p->pid);
set_gpreg(regs, 3, 0);
}
if (childregs->cp0_status & ST0_CU0) {
set_gpreg(childregs, 28, (unsigned long) p);
set_gpreg(childregs, 29, childksp);
p->thread.current_ds = KERNEL_DS;
} else {
set_gpreg(childregs, 29, usp);
p->thread.current_ds = USER_DS;
}
p->thread.reg29 = (unsigned long) childregs;
p->thread.reg31 = (unsigned long) ret_from_fork;
/*
* New tasks loose permission to use the fpu. This accelerates context
* switching for most programs since they don't use the fpu.
*/
#ifdef CONFIG_PS2
/* keep COP2 usable bit to share the VPU0 context */
p->thread.cp0_status = read_32bit_cp0_register(CP0_STATUS) &
~(ST0_CU1|KU_MASK);
childregs->cp0_status &= ~(ST0_CU1);
#else
p->thread.cp0_status = read_32bit_cp0_register(CP0_STATUS) &
~(ST0_CU2|ST0_CU1|KU_MASK);
childregs->cp0_status &= ~(ST0_CU2|ST0_CU1);
#endif
return 0;
}
asmlinkage int sys_pipe(struct pt_regs regs)
{
int fd[2];
int error, res;
lock_kernel();
error = do_pipe(fd);
if (error) {
res = error;
goto out;
}
set_gpreg(®s, 3, fd[1]);
res = fd[0];
out:
unlock_kernel();
return res;
}
