linux-kernel - [PATCH AUTOSEL 5.17 060/149] libbpf: Fix accessing syscall arguments on powerpc

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Message-Id: <20220401142536.1948161-60-sashal@kernel.org>
Date:   Fri,  1 Apr 2022 10:24:07 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ilya Leoshkevich <iii@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Sasha Levin <sashal@...nel.org>, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH AUTOSEL 5.17 060/149] libbpf: Fix accessing syscall arguments on powerpc

From: Ilya Leoshkevich <iii@...ux.ibm.com>

[ Upstream commit f07f1503469b11b739892d50c836992ffbe026ee ]

powerpc does not select ARCH_HAS_SYSCALL_WRAPPER, so its syscall
handlers take "unpacked" syscall arguments. Indicate this to libbpf
using PT_REGS_SYSCALL_REGS macro.

Reported-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Tested-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Link: https://lore.kernel.org/bpf/20220209021745.2215452-5-iii@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/lib/bpf/bpf_tracing.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
index 90f56b0f585f..d40b87c0e4b9 100644
--- a/tools/lib/bpf/bpf_tracing.h
+++ b/tools/lib/bpf/bpf_tracing.h
@@ -178,6 +178,8 @@
 #define __PT_RC_REG gpr[3]
 #define __PT_SP_REG sp
 #define __PT_IP_REG nip
+/* powerpc does not select ARCH_HAS_SYSCALL_WRAPPER. */
+#define PT_REGS_SYSCALL_REGS(ctx) ctx
 
 #elif defined(bpf_target_sparc)
 
-- 
2.34.1