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Date: Thu, 18 Feb 2016 19:48:35 +0800 From: Zhi-zhou Zhang <zhizhou.zh@...il.com> To: robin.murphy@....com, catalin.marinas@....com, will.deacon@....com Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, zhizhou <zhizhou.zh@...il.com> Subject: [PATCH] arm64: add architecture specified current_pt_regs From: zhizhou <zhizhou.zh@...il.com> This patch is based on the implementation of arm. The generic current_pt_regs is implemented with current->stack. It need to access memory that would be too expensive. Signed-off-by: zhizhou <zhizhou.zh@...il.com> --- arch/arm64/include/asm/ptrace.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index e9e5467..1865d54 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -185,5 +185,9 @@ static inline int valid_user_regs(struct user_pt_regs *regs) extern unsigned long profile_pc(struct pt_regs *regs); +#define current_pt_regs(void) ({ (struct pt_regs *) \ + ((current_stack_pointer | (THREAD_SIZE - 1)) - 0xf) - 1; \ +}) + #endif /* __ASSEMBLY__ */ #endif -- 2.5.0
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