/*
* Write contents of register REGNO in task TASK.
*/
int put_reg(struct task_struct *task, unsigned int regno, unsigned long data)
{
if (regno <= PT_EDA)
((unsigned long *)user_regs(task->thread_info))[regno] = data;
else if (regno == PT_USP)
task->thread.usp = data;
else if (regno == PT_PPC) {
/* Write pseudo-PC to ERP only if changed. */
if (data != get_pseudo_pc(task))
((unsigned long *)user_regs(task->thread_info))[PT_ERP] = data;
} else if (regno <= PT_MAX)
return put_debugreg(task->pid, regno, data);
else
return -1;
return 0;
}
/*
* Write contents of register REGNO in task TASK.
*/
static inline int put_reg(struct task_struct *task, unsigned int regno,
unsigned long data)
{
if (regno == PT_USP)
task->thread.usp = data;
else if (regno < PT_MAX)
((unsigned long *)user_regs(task))[regno] = data;
else
return -1;
return 0;
}
/*
* Get contents of register REGNO in task TASK.
*/
static inline long get_reg(struct task_struct *task, unsigned int regno)
{
/* USP is a special case, it's not in the pt_regs struct but
* in the tasks thread struct
*/
if (regno == PT_USP)
return task->thread.usp;
else if (regno < PT_MAX)
return ((unsigned long *)user_regs(task))[regno];
else
return 0;
}
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;
struct switch_stack *swstack;
/* put the pt_regs structure at the end of the new kernel stack page and fix it up
* remember that the task_struct doubles as the kernel stack for the task
*/
childregs = user_regs(p->thread_info);
*childregs = *regs; /* struct copy of pt_regs */
p->set_child_tid = p->clear_child_tid = NULL;
childregs->r10 = 0; /* child returns 0 after a fork/clone */
/* put the switch stack right below the pt_regs */
swstack = ((struct switch_stack *)childregs) - 1;
swstack->r9 = 0; /* parameter to ret_from_sys_call, 0 == dont restart the syscall */
/* we want to return into ret_from_sys_call after the _resume */
swstack->return_ip = (unsigned long) ret_from_fork; /* Will call ret_from_sys_call */
/* fix the user-mode stackpointer */
p->thread.usp = usp;
/* and the kernel-mode one */
p->thread.ksp = (unsigned long) swstack;
#ifdef DEBUG
printk("copy_thread: new regs at 0x%p, as shown below:\n", childregs);
show_registers(childregs);
#endif
return 0;
}
/*
* Get contents of register REGNO in task TASK.
*/
long get_reg(struct task_struct *task, unsigned int regno)
{
/* USP is a special case, it's not in the pt_regs struct but
* in the tasks thread struct
*/
unsigned long ret;
if (regno <= PT_EDA)
ret = ((unsigned long *)user_regs(task->thread_info))[regno];
else if (regno == PT_USP)
ret = task->thread.usp;
else if (regno == PT_PPC)
ret = get_pseudo_pc(task);
else if (regno <= PT_MAX)
ret = get_debugreg(task->pid, regno);
else
ret = 0;
return ret;
}
unsigned long thread_saved_pc(struct task_struct *t)
{
return (unsigned long)user_regs(t->stack)->pc;
}
/*
* Return saved PC of a blocked thread.
*/
unsigned long thread_saved_pc(struct task_struct *t)
{
return (unsigned long)user_regs(t->thread_info)->irp;
}
