Messages in this thread Patch in this message | | | Date | Fri, 13 Feb 2009 20:28:00 +0530 | From | "K.Prasad" <> | Subject | [Patch 7/10] Modify signal handling code to refrain from re-enabling HW Breakpoints |
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Modify signal handling code to refrain from re-enabling HW Breakpoints
From: Alan Stern <stern@rowland.harvard.edu>
This patch disables re-enabling of Hardware Breakpoint registers through the signal handling code. This is now done during hw_breakpoint_handler().
Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> --- arch/x86/kernel/signal.c | 9 --------- 1 file changed, 9 deletions(-)
Index: linux-2.6-tip.hbkpt/arch/x86/kernel/signal.c =================================================================== --- linux-2.6-tip.hbkpt.orig/arch/x86/kernel/signal.c +++ linux-2.6-tip.hbkpt/arch/x86/kernel/signal.c @@ -803,15 +803,6 @@ static void do_signal(struct pt_regs *re signr = get_signal_to_deliver(&info, &ka, regs, NULL); if (signr > 0) { - /* - * Re-enable any watchpoints before delivering the - * signal to user space. The processor register will - * have been cleared if the watchpoint triggered - * inside the kernel. - */ - if (current->thread.debugreg7) - set_debugreg(current->thread.debugreg7, 7); - /* Whee! Actually deliver the signal. */ if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { /*
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