diff options
| author | Roland McGrath <roland@redhat.com> | 2008-01-30 13:30:50 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:50 +0100 |
| commit | e1f287735c1e58c653b516931b5d3dd899edcb77 (patch) | |
| tree | 1a2948cfe8ff679135971e2c573d11b847fee93d /arch/x86/kernel/process_32.c | |
| parent | 7122ec8158b0f88befd94f4da8feae2c8d08d1b4 (diff) | |
x86 single_step: TIF_FORCED_TF
This changes the single-step support to use a new thread_info flag
TIF_FORCED_TF instead of the PT_DTRACE flag in task_struct.ptrace.
This keeps arch implementation uses out of this non-arch field.
This changes the ptrace access to eflags to mask TF and maintain
the TIF_FORCED_TF flag directly if userland sets TF, instead of
relying on ptrace_signal_deliver. The 64-bit and 32-bit kernels
are harmonized on this same behavior. The ptrace_signal_deliver
approach works now, but this change makes the low-level register
access code reliable when called from different contexts than a
ptrace stop, which will be possible in the future.
The 64-bit do_debug exception handler is also changed not to clear TF
from user-mode registers. This matches the 32-bit kernel's behavior.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/process_32.c')
| -rw-r--r-- | arch/x86/kernel/process_32.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index 4d66a56280d3..d9905c9d0fd5 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_32.c @@ -817,9 +817,6 @@ asmlinkage int sys_execve(struct pt_regs regs) (char __user * __user *) regs.edx, ®s); if (error == 0) { - task_lock(current); - current->ptrace &= ~PT_DTRACE; - task_unlock(current); /* Make sure we don't return using sysenter.. */ set_thread_flag(TIF_IRET); } |