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Commit 5a1b98d3 authored by Al Viro's avatar Al Viro
Browse files

new helper: sigsp() 



Normal logics for altstack handling in sigframe allocation

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 2ce5da17

include/linux/sched.h

+11 −0
Original line number Diff line number Diff line
@@ -2305,6 +2305,17 @@ static inline int sas_ss_flags(unsigned long sp) 
		: on_sig_stack(sp) ? SS_ONSTACK : 0);

}



static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)

{

	if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))

#ifdef CONFIG_STACK_GROWSUP

		return current->sas_ss_sp;

#else

		return current->sas_ss_sp + current->sas_ss_size;

#endif

	return sp;

}



/*

 * Routines for handling mm_structs

 */