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| 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 /include/asm-x86/thread_info_64.h | |
| parent | x86: single_step: share code (diff) | |
| download | linux-dev-e1f287735c1e58c653b516931b5d3dd899edcb77.tar.xz linux-dev-e1f287735c1e58c653b516931b5d3dd899edcb77.zip | |
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 'include/asm-x86/thread_info_64.h')
| -rw-r--r-- | include/asm-x86/thread_info_64.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-x86/thread_info_64.h b/include/asm-x86/thread_info_64.h index c8e7736fc792..e0f41b3deced 100644 --- a/include/asm-x86/thread_info_64.h +++ b/include/asm-x86/thread_info_64.h @@ -121,6 +121,7 @@ static inline struct thread_info *stack_thread_info(void) #define TIF_DEBUG 21 /* uses debug registers */ #define TIF_IO_BITMAP 22 /* uses I/O bitmap */ #define TIF_FREEZE 23 /* is freezing for suspend */ +#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) @@ -138,6 +139,7 @@ static inline struct thread_info *stack_thread_info(void) #define _TIF_DEBUG (1<<TIF_DEBUG) #define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP) #define _TIF_FREEZE (1<<TIF_FREEZE) +#define _TIF_FORCED_TF (1<<TIF_FORCED_TF) /* work to do on interrupt/exception return */ #define _TIF_WORK_MASK \ |