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author | Al Viro <viro@zeniv.linux.org.uk> | 2012-11-05 13:00:27 -0500 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-11-29 00:01:23 -0500 |
commit | 22062a96300dabfef93368a28c34bdf35c9b8308 (patch) | |
tree | 6e04303c437911d21079a34ac0853137eeb91f8b /include/linux/ptrace.h | |
parent | 4f4202fe5ae9a43e59303f20d700571f695d7b1b (diff) | |
download | linux-22062a96300dabfef93368a28c34bdf35c9b8308.tar.gz linux-22062a96300dabfef93368a28c34bdf35c9b8308.tar.bz2 linux-22062a96300dabfef93368a28c34bdf35c9b8308.zip |
new helper: signal_pt_regs()
Always equal to task_pt_regs(current); defined only when we are in
signal delivery. It may be different from current_pt_regs() - e.g.
architectures like m68k may have pt_regs location on exception
different from that on a syscall and signals (just as ptrace handling)
may happen on exceptions as well as on syscalls.
When they are equal, it's often better to have signal_pt_regs
defined (in asm/ptrace.h) as current_pt_regs - that tends to be
optimized better than default would be. However, optimisation is
the only reason why we might want an arch-specific definition;
if current_pt_regs() and task_pt_regs(current) have different
values, the latter one is right.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/ptrace.h')
-rw-r--r-- | include/linux/ptrace.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h index 7aefbae2452e..b8e6dcec78ae 100644 --- a/include/linux/ptrace.h +++ b/include/linux/ptrace.h @@ -333,6 +333,15 @@ static inline void user_single_step_siginfo(struct task_struct *tsk, #define ptrace_signal_deliver(regs, cookie) do { } while (0) #endif +/* + * unlike current_pt_regs(), this one is equal to task_pt_regs(current) + * on *all* architectures; the only reason to have a per-arch definition + * is optimisation. + */ +#ifndef signal_pt_regs +#define signal_pt_regs() task_pt_regs(current) +#endif + extern int task_current_syscall(struct task_struct *target, long *callno, unsigned long args[6], unsigned int maxargs, unsigned long *sp, unsigned long *pc); |