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new helper: current_pt_regs()

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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>
This commit is contained in:
Al Viro 2012-09-30 13:12:36 -04:00
parent 2aa3a7f866
commit a3460a5974
1 changed files with 4 additions and 0 deletions
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4
include/linux/ptrace.h
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@ -403,6 +403,10 @@ static inline void user_single_step_siginfo(struct task_struct *tsk,
#define arch_ptrace_stop(code, info) do { } while (0) #define arch_ptrace_stop(code, info) do { } while (0)
#endif #endif
#ifndef current_pt_regs
#define current_pt_regs() task_pt_regs(current)
#endif
extern int task_current_syscall(struct task_struct *target, long *callno, extern int task_current_syscall(struct task_struct *target, long *callno,
unsigned long args[6], unsigned int maxargs, unsigned long args[6], unsigned int maxargs,
unsigned long *sp, unsigned long *pc); unsigned long *sp, unsigned long *pc);