C++ (Cpp) task_user_gs Examples

Example #1

File: process_32.c Project: Aircell/asp-kernel

int copy_thread(unsigned long clone_flags, unsigned long sp,
	unsigned long unused,
	struct task_struct *p, struct pt_regs *regs)
{
	struct pt_regs *childregs;
	struct task_struct *tsk;
	int err;

	childregs = task_pt_regs(p);
	*childregs = *regs;
	childregs->ax = 0;
	childregs->sp = sp;

	p->thread.sp = (unsigned long) childregs;
	p->thread.sp0 = (unsigned long) (childregs+1);

	p->thread.ip = (unsigned long) ret_from_fork;

	task_user_gs(p) = get_user_gs(regs);

	p->thread.io_bitmap_ptr = NULL;
	tsk = current;
	err = -ENOMEM;

	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));

	if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) {
		p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr,
						IO_BITMAP_BYTES, GFP_KERNEL);
		if (!p->thread.io_bitmap_ptr) {
			p->thread.io_bitmap_max = 0;
			return -ENOMEM;
		}
		set_tsk_thread_flag(p, TIF_IO_BITMAP);
	}

	err = 0;

	/*
	 * Set a new TLS for the child thread?
	 */
	if (clone_flags & CLONE_SETTLS)
		err = do_set_thread_area(p, -1,
			(struct user_desc __user *)childregs->si, 0);

	if (err && p->thread.io_bitmap_ptr) {
		kfree(p->thread.io_bitmap_ptr);
		p->thread.io_bitmap_max = 0;
	}

	clear_tsk_thread_flag(p, TIF_DS_AREA_MSR);
	p->thread.ds_ctx = NULL;

	clear_tsk_thread_flag(p, TIF_DEBUGCTLMSR);
	p->thread.debugctlmsr = 0;

	return err;
}

Example #2

File: process_32.c Project: harvey-che/Xc

int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long unused,
		        struct task_struct *p, struct pt_regs *regs)
{
   struct pt_regs *childregs;
   struct task_struct *tsk;

   childregs = task_pt_regs(p);
   *childregs = *regs;

   childregs->ax = 0;
   childregs->sp = sp;

   p->thread.sp = (unsigned long)childregs;
   p->thread.sp0 = (unsigned long)(childregs + 1);

   p->thread.ip = (unsigned long)ret_from_fork;

   task_user_gs(p) = get_user_gs(regs);

   p->thread.io_bitmap_ptr = NULL;
   tsk = current;
   err = -ENOMEM;

   memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));

   if (test_tsk_thread_flag(tsk, TIF_IO_BITMAP)) {
       p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr, IO_BITMAP_BYTES, GFP_KERNEL);
	   if (!p->thread.io_bitmap_ptr) {
		   p->thread.io_bitmap_max = 0;
		   return -ENOMEM;
	   }
	   set_tsk_thead_flag(p, TIF_IO_BITMAP);
   }

   err = 0;
   
   if (err && p->thread.io_bitmap_ptr) {
       kfree(p->thread.io_bitmap_ptr);
	   p->thread.io_bitmap_max = 0;
   }

   return err;
}

Example #3

File: process_32.c Project: AdrianHuang/linux-3.8.13

int copy_thread(unsigned long clone_flags, unsigned long sp,
	unsigned long arg, struct task_struct *p)
{
	struct pt_regs *childregs = task_pt_regs(p);
	struct task_struct *tsk;
	int err;

	p->thread.sp = (unsigned long) childregs;
	p->thread.sp0 = (unsigned long) (childregs+1);

	if (unlikely(p->flags & PF_KTHREAD)) {
		/* kernel thread */
		memset(childregs, 0, sizeof(struct pt_regs));
		p->thread.ip = (unsigned long) ret_from_kernel_thread;
		task_user_gs(p) = __KERNEL_STACK_CANARY;
		childregs->ds = __USER_DS;
		childregs->es = __USER_DS;
		childregs->fs = __KERNEL_PERCPU;
		childregs->bx = sp;	/* function */
		childregs->bp = arg;
		childregs->orig_ax = -1;
		childregs->cs = __KERNEL_CS | get_kernel_rpl();
		childregs->flags = X86_EFLAGS_IF | X86_EFLAGS_BIT1;
		p->fpu_counter = 0;
		p->thread.io_bitmap_ptr = NULL;
		memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
		return 0;
	}
	*childregs = *current_pt_regs();
	childregs->ax = 0;
	if (sp)
		childregs->sp = sp;

	p->thread.ip = (unsigned long) ret_from_fork;
	task_user_gs(p) = get_user_gs(current_pt_regs());

	p->fpu_counter = 0;
	p->thread.io_bitmap_ptr = NULL;
	tsk = current;
	err = -ENOMEM;

	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));

	if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) {
		p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr,
						IO_BITMAP_BYTES, GFP_KERNEL);
		if (!p->thread.io_bitmap_ptr) {
			p->thread.io_bitmap_max = 0;
			return -ENOMEM;
		}
		set_tsk_thread_flag(p, TIF_IO_BITMAP);
	}

	err = 0;

	/*
	 * Set a new TLS for the child thread?
	 */
	if (clone_flags & CLONE_SETTLS)
		err = do_set_thread_area(p, -1,
			(struct user_desc __user *)childregs->si, 0);

	if (err && p->thread.io_bitmap_ptr) {
		kfree(p->thread.io_bitmap_ptr);
		p->thread.io_bitmap_max = 0;
	}
	return err;
}