linux-kernel - [PATCH v2 1/2] arm64/sve: ptrace: Fix SVE_PT_REGS

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Message-Id: <1546607391-3850-2-git-send-email-Dave.Martin@arm.com>
Date:   Fri,  4 Jan 2019 13:09:50 +0000
From:   Dave Martin <Dave.Martin@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>,
        Alan Hayward <alan.hayward@....com>,
        Szabolcs Nagy <szabolcs.nagy@....com>
Subject: [PATCH v2 1/2] arm64/sve: ptrace: Fix SVE_PT_REGS_OFFSET definition

SVE_PT_REGS_OFFSET is supposed to indicate the offset for skipping
over the ptrace NT_ARM_SVE header (struct user_sve_header) to the
start of the SVE register data proper.

However, currently SVE_PT_REGS_OFFSET is defined in terms of struct
sve_context, which is wrong: that structure describes the SVE
header in the signal frame, not in the ptrace regset.

This patch fixes the definition to use the ptrace header structure
struct user_sve_header instead.

By good fortune, the two structures are the same size anyway, so
there is no functional or ABI change.

Signed-off-by: Dave Martin <Dave.Martin@....com>
---
 arch/arm64/include/uapi/asm/ptrace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h
index a36227f..65ef8b0 100644
--- a/arch/arm64/include/uapi/asm/ptrace.h
+++ b/arch/arm64/include/uapi/asm/ptrace.h
@@ -131,7 +131,7 @@ struct user_sve_header {

 /* Offset from the start of struct user_sve_header to the register data */
 #define SVE_PT_REGS_OFFSET					\
-	((sizeof(struct sve_context) + (SVE_VQ_BYTES - 1))	\
+	((sizeof(struct user_sve_header) + (SVE_VQ_BYTES - 1))	\
 		/ SVE_VQ_BYTES * SVE_VQ_BYTES)

 /*
-- 
2.1.4