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Commit 1ca97bb5 authored by Al Viro's avatar Al Viro
Browse files

new helper: current_user_stack_pointer() 



	Cross-architecture equivalent of rdusp(); default is
user_stack_pointer(current_pt_regs()) - that works for almost all
platforms that have usp saved in pt_regs.  The only exception from
that is ia64 - we want memory stack, not the backing store for
register one.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 5208ba24

arch/alpha/include/asm/ptrace.h

+1 −0
Original line number Diff line number Diff line
@@ -72,6 +72,7 @@ struct switch_stack { 
#define user_mode(regs) (((regs)->ps & 8) != 0)

#define instruction_pointer(regs) ((regs)->pc)

#define profile_pc(regs) instruction_pointer(regs)

#define current_user_stack_pointer() rdusp()



#define task_pt_regs(task) \

  ((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)

arch/blackfin/include/asm/ptrace.h

+1 −0
Original line number Diff line number Diff line
@@ -106,6 +106,7 @@ struct pt_regs { 
#define arch_has_single_step()	(1)

/* common code demands this function */

#define ptrace_disable(child) user_disable_single_step(child)

#define current_user_stack_pointer() rdusp()



extern int is_user_addr_valid(struct task_struct *child,

			      unsigned long start, unsigned long len);

arch/cris/include/asm/ptrace.h

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#define PTRACE_SETREGS            13



#define profile_pc(regs) instruction_pointer(regs)

#define current_user_stack_pointer() rdusp()



#endif /* __KERNEL__ */

arch/h8300/include/asm/ptrace.h

+1 −0
Original line number Diff line number Diff line
@@ -63,6 +63,7 @@ struct pt_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)

#define current_user_stack_pointer() rdusp()

#endif /* __KERNEL__ */

#endif /* __ASSEMBLY__ */

#endif /* _H8300_PTRACE_H */

arch/ia64/include/asm/ptrace.h

+5 −0
Original line number Diff line number Diff line
@@ -78,6 +78,11 @@ static inline long regs_return_value(struct pt_regs *regs) 
	unsigned long __ip = instruction_pointer(regs);			\

	(__ip & ~3UL) + ((__ip & 3UL) << 2);				\

})

/*

 * Why not default?  Because user_stack_pointer() on ia64 gives register

 * stack backing store instead...

 */

#define current_user_stack_pointer() (current_pt_regs()->r12)



  /* given a pointer to a task_struct, return the user's pt_regs */

# define task_pt_regs(t)		(((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)