linux-kernel - [PATCH 2/9] powerpc: add modify_instruction() and modify_instruction

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Message-Id: <7d51b0a71491e9260da34935bd28b04366831ef4.1541784640.git.christophe.leroy@c-s.fr>
Date:   Fri,  9 Nov 2018 17:33:17 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 2/9] powerpc: add modify_instruction() and
 modify_instruction_site()

Add two helpers to avoid hardcoding of instructions modifications.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/include/asm/code-patching.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/powerpc/include/asm/code-patching.h b/arch/powerpc/include/asm/code-patching.h
index 0eeed21e4898..2074b40f3fb5 100644
--- a/arch/powerpc/include/asm/code-patching.h
+++ b/arch/powerpc/include/asm/code-patching.h
@@ -49,6 +49,17 @@ static inline int patch_branch_site(s32 *site, unsigned long target, int flags)
 	return patch_branch((unsigned int *)patch_site_addr(site), target, flags);
 }
 
+static inline int modify_instruction(unsigned int *addr, unsigned int clr,
+				     unsigned int set)
+{
+	return patch_instruction(addr, (*addr & ~clr) | set);
+}
+
+static inline int modify_instruction_site(s32 *site, unsigned int clr, unsigned int set)
+{
+	return modify_instruction((unsigned int *)patch_site_addr(site), clr, set);
+}
+
 int instr_is_relative_branch(unsigned int instr);
 int instr_is_relative_link_branch(unsigned int instr);
 int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr);
-- 
2.13.3