linux-kernel - [RFC PATCH V2 04/10] arm64: Add helper for link pointer

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Message-Id: <9b12762abf045a08c930f71537edf1affcca0c5c.1434598237.git.panand@redhat.com>
Date:	Thu, 18 Jun 2015 09:28:51 +0530
From:	Pratyush Anand <panand@...hat.com>
To:	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	catalin.marinas@....com, will.deacon@....com
Cc:	linux-kernel@...r.kernel.org, wcohen@...hat.com, oleg@...hat.com,
	dave.long@...aro.org, steve.capper@...aro.org,
	srikar@...ux.vnet.ibm.com, vijaya.kumar@...iumnetworks.com,
	Pratyush Anand <panand@...hat.com>
Subject: [RFC PATCH V2 04/10] arm64: Add helper for link pointer

At many a place we program procedure link pointer ie regs[30]. So adding
helper to do that.

Signed-off-by: Pratyush Anand <panand@...hat.com>
---
 arch/arm64/include/asm/ptrace.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index 3ea7f5a04bfc..fa2c122e5bd6 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -227,6 +227,13 @@ static inline int valid_user_regs(struct user_pt_regs *regs)
 #include <asm-generic/ptrace.h>
 
 #define stack_pointer(regs)		((regs)->sp)
+#define procedure_link_pointer(regs)	((regs)->regs[30])
+
+static inline void procedure_link_pointer_set(struct pt_regs *regs,
+					   unsigned long val)
+{
+	procedure_link_pointer(regs) = val;
+}
 
 #ifdef CONFIG_SMP
 #undef profile_pc
-- 
2.1.0

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