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Commit d277fb89 authored by Roland McGrath's avatar Roland McGrath Committed by Ingo Molnar
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x86: x86-64 ia32 ptrace get/putreg32 current task 



This generalizes the getreg32 and putreg32 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 5fd4d16b

arch/x86/ia32/ptrace32.c

+16 −0
Original line number Diff line number Diff line
@@ -48,19 +48,27 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val) 
		if (val && (val & 3) != 3)

			return -EIO;

		child->thread.fsindex = val & 0xffff;

		if (child == current)

			loadsegment(fs, child->thread.fsindex);

		break;

	case offsetof(struct user32, regs.gs):

		if (val && (val & 3) != 3)

			return -EIO;

		child->thread.gsindex = val & 0xffff;

		if (child == current)

			load_gs_index(child->thread.gsindex);

		break;

	case offsetof(struct user32, regs.ds):

		if (val && (val & 3) != 3)

			return -EIO;

		child->thread.ds = val & 0xffff;

		if (child == current)

			loadsegment(ds, child->thread.ds);

		break;

	case offsetof(struct user32, regs.es):

		child->thread.es = val & 0xffff;

		if (child == current)

			loadsegment(es, child->thread.ds);

		break;

	case offsetof(struct user32, regs.ss):

		if ((val & 3) != 3)
@@ -129,15 +137,23 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val) 
	switch (regno) {

	case offsetof(struct user32, regs.fs):

		*val = child->thread.fsindex;

		if (child == current)

			asm("movl %%fs,%0" : "=r" (*val));

		break;

	case offsetof(struct user32, regs.gs):

		*val = child->thread.gsindex;

		if (child == current)

			asm("movl %%gs,%0" : "=r" (*val));

		break;

	case offsetof(struct user32, regs.ds):

		*val = child->thread.ds;

		if (child == current)

			asm("movl %%ds,%0" : "=r" (*val));

		break;

	case offsetof(struct user32, regs.es):

		*val = child->thread.es;

		if (child == current)

			asm("movl %%es,%0" : "=r" (*val));

		break;



	R32(cs, cs);