Commit f737561c authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: stack unwinding: reorganize how initial register state setup 



This is a non-functional change, if anything a better fall-back
handling.

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent e42404fa

arch/arc/kernel/stacktrace.c

+18 −19
Original line number Diff line number Diff line
@@ -42,11 +42,23 @@ static int 
seed_unwind_frame_info(struct task_struct *tsk, struct pt_regs *regs,

		       struct unwind_frame_info *frame_info)

{

	if (regs) {

		/*

		 * Asynchronous unwinding of intr/exception

		 *  - Just uses the pt_regs passed

		 */

		frame_info->task = tsk;



		frame_info->regs.r27 = regs->fp;

		frame_info->regs.r28 = regs->sp;

		frame_info->regs.r31 = regs->blink;

		frame_info->regs.r63 = regs->ret;

		frame_info->call_frame = 0;

	} else if (tsk == NULL || tsk == current) {

		/*

		 * synchronous unwinding (e.g. dump_stack)

		 *  - uses current values of SP and friends

		 */

	if (regs == NULL && (tsk == NULL || tsk == current)) {

		unsigned long fp, sp, blink, ret;

		frame_info->task = current;
@@ -63,7 +75,7 @@ seed_unwind_frame_info(struct task_struct *tsk, struct pt_regs *regs, 
		frame_info->regs.r31 = blink;

		frame_info->regs.r63 = ret;

		frame_info->call_frame = 0;

	} else if (regs == NULL) {

	} else {

		/*

		 * Asynchronous unwinding of a likely sleeping task

		 *  - first ensure it is actually sleeping
@@ -94,20 +106,7 @@ seed_unwind_frame_info(struct task_struct *tsk, struct pt_regs *regs, 
		frame_info->regs.r28 += 60;

		frame_info->call_frame = 0;



	} else {

		/*

		 * Asynchronous unwinding of intr/exception

		 *  - Just uses the pt_regs passed

		 */

		frame_info->task = tsk;



		frame_info->regs.r27 = regs->fp;

		frame_info->regs.r28 = regs->sp;

		frame_info->regs.r31 = regs->blink;

		frame_info->regs.r63 = regs->ret;

		frame_info->call_frame = 0;

	}



	return 0;

}