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new helper: current_user_stack_pointer()

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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: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2012-11-18 12:50:10 -05:00
commit 1ca97bb541
7 changed files with 14 additions and 0 deletions
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1
arch/m68k/include/asm/ptrace.h
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@ -15,6 +15,7 @@
#define profile_pc(regs) instruction_pointer(regs)
#define current_pt_regs() \
(struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1
#define current_user_stack_pointer() rdusp()
#define arch_has_single_step() (1)