arm64: report correct stack pointer in KSTK_ESP for compat tasks
The KSTK_ESP macro is used to determine the user stack pointer for a given task. In particular, this is used to to report the '[stack]' VMA in /proc/self/maps, which is used by Android to determine the stack location for children of the main thread. This patch fixes the macro to use user_stack_pointer instead of directly returning sp. This means that we report w13 instead of sp, since the former is used as the stack pointer when executing in AArch32 state. Cc: <stable@vger.kernel.org> Reported-by: Serban Constantinescu <Serban.Constantinescu@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@ -139,7 +139,7 @@ extern struct task_struct *cpu_switch_to(struct task_struct *prev,
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((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
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#define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
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#define KSTK_ESP(tsk) ((unsigned long)task_pt_regs(tsk)->sp)
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#define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
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/*
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* Prefetching support
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