diff options
Diffstat (limited to 'include/linux/ptrace.h')
| -rw-r--r-- | include/linux/ptrace.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h index ae8146abd746..6ab80714a916 100644 --- a/include/linux/ptrace.h +++ b/include/linux/ptrace.h @@ -97,6 +97,7 @@ extern void __ptrace_link(struct task_struct *child, extern void __ptrace_unlink(struct task_struct *child); extern void ptrace_untrace(struct task_struct *child); extern int ptrace_may_attach(struct task_struct *task); +extern int __ptrace_may_attach(struct task_struct *task); static inline void ptrace_link(struct task_struct *child, struct task_struct *new_parent) @@ -128,6 +129,116 @@ 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. If arch_has_block_step() is defined, + * this must clear the effects of user_enable_block_step() too. + */ +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() and + * user_enable_block_step(). This can be called whether or not either + * of those 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 */ + +#ifndef arch_has_block_step +/** + * arch_has_block_step - does this CPU support user-mode block-step? + * + * If this is defined, then there must be a function declaration or inline + * for user_enable_block_step(), and arch_has_single_step() must be defined + * too. arch_has_block_step() should evaluate to nonzero iff the machine + * supports step-until-branch for user mode. It can be a constant or it + * can test a CPU feature bit. + */ +#define arch_has_block_step() (0) + +/** + * user_enable_block_step - step until branch in user-mode task + * @task: either current or a task stopped in %TASK_TRACED + * + * This can only be called when arch_has_block_step() has returned nonzero, + * and will never be called when single-instruction stepping is being used. + * Set @task so that when it returns to user mode, it will trap after the + * next branch or trap taken. + */ +static inline void user_enable_block_step(struct task_struct *task) +{ + BUG(); /* This can never be called. */ +} +#endif /* arch_has_block_step */ + +#ifndef arch_ptrace_stop_needed +/** + * arch_ptrace_stop_needed - Decide whether arch_ptrace_stop() should be called + * @code: current->exit_code value ptrace will stop with + * @info: siginfo_t pointer (or %NULL) for signal ptrace will stop with + * + * This is called with the siglock held, to decide whether or not it's + * necessary to release the siglock and call arch_ptrace_stop() with the + * same @code and @info arguments. It can be defined to a constant if + * arch_ptrace_stop() is never required, or always is. On machines where + * this makes sense, it should be defined to a quick test to optimize out + * calling arch_ptrace_stop() when it would be superfluous. For example, + * if the thread has not been back to user mode since the last stop, the + * thread state might indicate that nothing needs to be done. + */ +#define arch_ptrace_stop_needed(code, info) (0) +#endif + +#ifndef arch_ptrace_stop +/** + * arch_ptrace_stop - Do machine-specific work before stopping for ptrace + * @code: current->exit_code value ptrace will stop with + * @info: siginfo_t pointer (or %NULL) for signal ptrace will stop with + * + * This is called with no locks held when arch_ptrace_stop_needed() has + * just returned nonzero. It is allowed to block, e.g. for user memory + * access. The arch can have machine-specific work to be done before + * ptrace stops. On ia64, register backing store gets written back to user + * memory here. Since this can be costly (requires dropping the siglock), + * we only do it when the arch requires it for this particular stop, as + * indicated by arch_ptrace_stop_needed(). + */ +#define arch_ptrace_stop(code, info) do { } while (0) +#endif + #endif #endif |