Commit 02a017a9 authored by David Mosberger-Tang's avatar David Mosberger-Tang Committed by Tony Luck
Browse files

[IA64] Correct convert_to_non_syscall() 



convert_to_non_syscall() has the same problem that unwind_to_user()
used to have.  Fix it likewise.

Signed-off-by: default avatarDavid Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent d0dac808

arch/ia64/kernel/ptrace.c

+17 −3
Original line number Diff line number Diff line
@@ -692,16 +692,30 @@ convert_to_non_syscall (struct task_struct *child, struct pt_regs *pt, 
			unsigned long cfm)

{

	struct unw_frame_info info, prev_info;

	unsigned long ip, pr;

	unsigned long ip, sp, pr;



	unw_init_from_blocked_task(&info, child);

	while (1) {

		prev_info = info;

		if (unw_unwind(&info) < 0)

			return;

		if (unw_get_rp(&info, &ip) < 0)



		unw_get_sp(&info, &sp);

		if ((long)((unsigned long)child + IA64_STK_OFFSET - sp)

		    < IA64_PT_REGS_SIZE) {

			dprintk("ptrace.%s: ran off the top of the kernel "

				"stack\n", __FUNCTION__);

			return;

		}

		if (unw_get_pr (&prev_info, &pr) < 0) {

			unw_get_rp(&prev_info, &ip);

			dprintk("ptrace.%s: failed to read "

				"predicate register (ip=0x%lx)\n",

				__FUNCTION__, ip);

			return;

		if (ip < FIXADDR_USER_END)

		}

		if (unw_is_intr_frame(&info)

		    && (pr & (1UL << PRED_USER_STACK)))

			break;

	}