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new helper: current_pt_regs()
Normally (and that's the default) it's just task_pt_regs(current). However, if an architecture can optimize that, it can do so by making a macro of its own available from asm/ptrace.h. More importantly, some architectures have task_pt_regs() working only for traced tasks blocked on signal delivery. current_pt_regs() needs to work for *all* processes, so before those architectures start using stuff relying on current_pt_regs() they'll need a properly working variant. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -403,6 +403,10 @@ static inline void user_single_step_siginfo(struct task_struct *tsk,
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#define arch_ptrace_stop(code, info) do { } while (0)
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#endif
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#ifndef current_pt_regs
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#define current_pt_regs() task_pt_regs(current)
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#endif
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extern int task_current_syscall(struct task_struct *target, long *callno,
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unsigned long args[6], unsigned int maxargs,
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unsigned long *sp, unsigned long *pc);
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