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ptrace: arch_has_single_step

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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>
This commit is contained in:
Roland McGrath 2008-01-30 13:30:47 +01:00 committed by Ingo Molnar
parent 022eb43419
commit fb7fa8f174
1 changed files with 46 additions and 0 deletions
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46
include/linux/ptrace.h
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@ -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