Messages in this thread Patch in this message | | | From | Roland McGrath <> | Subject | [PATCH x86/mm 5/6] x86-32 ptrace get/putreg current task | Date | Wed, 28 Nov 2007 16:42:05 -0800 (PST) |
| |
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: Roland McGrath <roland@redhat.com> --- arch/x86/kernel/ptrace_32.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/ptrace_32.c b/arch/x86/kernel/ptrace_32.c index 5aca84e..2607130 100644 --- a/arch/x86/kernel/ptrace_32.c +++ b/arch/x86/kernel/ptrace_32.c @@ -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: - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |