linux-kernel - [RFC PATCH v2 08/13] powerpc/syscall: Save r3 in regs->orig

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Date:   Sun,  5 Apr 2020 17:44:43 +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>, npiggin@...il.com,
        msuchanek@...e.de
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v2 08/13] powerpc/syscall: Save r3 in regs->orig_r3

Save r3 in regs->orig_r3 in system_call_exception()

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/kernel/entry_64.S | 1 -
 arch/powerpc/kernel/syscall.c  | 2 ++
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 63f0a4414618..5ccb65f75712 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -114,7 +114,6 @@ END_BTB_FLUSH_SECTION
 	std	r10,_LINK(r1)
 	std	r11,_TRAP(r1)
 	std	r12,_CCR(r1)
-	std	r3,ORIG_GPR3(r1)
 	addi	r10,r1,STACK_FRAME_OVERHEAD
 	ld	r11,exception_marker@toc(r2)
 	std	r11,-16(r10)		/* "regshere" marker */
diff --git a/arch/powerpc/kernel/syscall.c b/arch/powerpc/kernel/syscall.c
index 4674cfd2916d..986489ea9fb4 100644
--- a/arch/powerpc/kernel/syscall.c
+++ b/arch/powerpc/kernel/syscall.c
@@ -27,6 +27,8 @@ notrace long system_call_exception(long r3, long r4, long r5,
 	unsigned long ti_flags;
 	syscall_fn f;
 
+	regs->orig_gpr3 = r3;
+
 #ifdef CONFIG_PPC64
 	if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
 		BUG_ON(irq_soft_mask_return() != IRQS_ALL_DISABLED);
-- 
2.25.0