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Commit 5fd4d16b authored by Roland McGrath's avatar Roland McGrath Committed by Ingo Molnar
Browse files

x86: x86-32 ptrace get/putreg current task 



This generalizes the getreg and putreg functions so they can be used on the
current task, as well as on a task stopped in TASK_TRACED and switched off.
This lays the groundwork to share this code for all kinds of user-mode
machine state access, not just ptrace.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent ce90f340

arch/x86/kernel/ptrace_32.c

+8 −0
Original line number Diff line number Diff line
@@ -55,6 +55,12 @@ static int putreg(struct task_struct *child, 
		if (value && (value & 3) != 3)

			return -EIO;

		child->thread.gs = value;

		if (child == current)

			/*

			 * The user-mode %gs is not affected by

			 * kernel entry, so we must update the CPU.

			 */

			loadsegment(gs, value);

		return 0;

	case DS:

	case ES:
@@ -104,6 +110,8 @@ static unsigned long getreg(struct task_struct *child, unsigned long regno) 
		break;

	case GS:

		retval = child->thread.gs;

		if (child == current)

			savesegment(gs, retval);

		break;

	case DS:

	case ES: