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author | Roland McGrath <roland@redhat.com> | 2008-01-30 12:30:47 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 12:30:47 (GMT) |
commit | fb7fa8f1741c91f6c6e958762155abe9339476ca (patch) | |
tree | ce916e9e735cdd0202015cd52f5e93b7a2df7011 /include/linux/ptrace.h | |
parent | 022eb43419f896a3647f769cdc3b5e13a8fb8ee7 (diff) | |
download | linux-fsl-qoriq-fb7fa8f1741c91f6c6e958762155abe9339476ca.tar.xz |
ptrace: arch_has_single_step
This defines the new macro arch_has_single_step() in linux/ptrace.h, a
default for when asm/ptrace.h does not define it. It declares the new
user_enable_single_step and user_disable_single_step functions.
This is not used yet, but paves the way to harmonize on this interface
for the arch-specific calls on all machines.
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/linux/ptrace.h')
-rw-r--r-- | include/linux/ptrace.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h index 3ea5750..8f06c6f 100644 --- a/include/linux/ptrace.h +++ b/include/linux/ptrace.h @@ -129,6 +129,52 @@ int generic_ptrace_pokedata(struct task_struct *tsk, long addr, long data); #define force_successful_syscall_return() do { } while (0) #endif +/* + * <asm/ptrace.h> should define the following things inside #ifdef __KERNEL__. + * + * These do-nothing inlines are used when the arch does not + * implement single-step. The kerneldoc comments are here + * to document the interface for all arch definitions. + */ + +#ifndef arch_has_single_step +/** + * arch_has_single_step - does this CPU support user-mode single-step? + * + * If this is defined, then there must be function declarations or + * inlines for user_enable_single_step() and user_disable_single_step(). + * arch_has_single_step() should evaluate to nonzero iff the machine + * supports instruction single-step for user mode. + * It can be a constant or it can test a CPU feature bit. + */ +#define arch_has_single_step() (0) + +/** + * user_enable_single_step - single-step in user-mode task + * @task: either current or a task stopped in %TASK_TRACED + * + * This can only be called when arch_has_single_step() has returned nonzero. + * Set @task so that when it returns to user mode, it will trap after the + * next single instruction executes. + */ +static inline void user_enable_single_step(struct task_struct *task) +{ + BUG(); /* This can never be called. */ +} + +/** + * user_disable_single_step - cancel user-mode single-step + * @task: either current or a task stopped in %TASK_TRACED + * + * Clear @task of the effects of user_enable_single_step(). This can + * be called whether or not user_enable_single_step() was ever called + * on @task, and even if arch_has_single_step() returned zero. + */ +static inline void user_disable_single_step(struct task_struct *task) +{ +} +#endif /* arch_has_single_step */ + #endif #endif |