path: root/arch/h8300/include
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authorAl Viro <viro@zeniv.linux.org.uk>2012-11-05 13:00:27 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2012-11-29 00:01:23 -0500
commit22062a96300dabfef93368a28c34bdf35c9b8308 (patch)
tree6e04303c437911d21079a34ac0853137eeb91f8b /arch/h8300/include
parent4f4202fe5ae9a43e59303f20d700571f695d7b1b (diff)
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 'arch/h8300/include')
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/h8300/include/asm/ptrace.h b/arch/h8300/include/asm/ptrace.h
index 00502a61bf0..7468589a128 100644
--- a/arch/h8300/include/asm/ptrace.h
+++ b/arch/h8300/include/asm/ptrace.h
@@ -62,6 +62,7 @@ struct pt_regs {
#define profile_pc(regs) instruction_pointer(regs)
#define current_pt_regs() ((struct pt_regs *) \
(THREAD_SIZE + (unsigned long)current_thread_info()) - 1)
+#define signal_pt_regs() ((struct pt_regs *)current->thread.esp0)
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _H8300_PTRACE_H */