linux-kernel - [PATCH 5.19 0449/1157] libbpf, riscv: Use a0 for RC register

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Date:   Mon, 15 Aug 2022 19:56:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yixun Lan <dlan@...too.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Björn Töpel <bjorn@...nel.org>,
        Amjad OULED-AMEUR <ouledameur.amjad@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0449/1157] libbpf, riscv: Use a0 for RC register

From: Yixun Lan <dlan@...too.org>

[ Upstream commit 935dc35c75318fa213d26808ad8bb130fb0b486e ]

According to the RISC-V calling convention register usage here [0], a0
is used as return value register, so rename it to make it consistent
with the spec.

  [0] section 18.2, table 18.2
      https://riscv.org/wp-content/uploads/2015/01/riscv-calling.pdf

Fixes: 589fed479ba1 ("riscv, libbpf: Add RISC-V (RV64) support to bpf_tracing.h")
Signed-off-by: Yixun Lan <dlan@...too.org>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Acked-by: Björn Töpel <bjorn@...nel.org>
Acked-by: Amjad OULED-AMEUR <ouledameur.amjad@...il.com>
Link: https://lore.kernel.org/bpf/20220706140204.47926-1-dlan@gentoo.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/lib/bpf/bpf_tracing.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
index 01ce121c302d..11f9096407fc 100644
--- a/tools/lib/bpf/bpf_tracing.h
+++ b/tools/lib/bpf/bpf_tracing.h
@@ -233,7 +233,7 @@ struct pt_regs___arm64 {
 #define __PT_PARM5_REG a4
 #define __PT_RET_REG ra
 #define __PT_FP_REG s0
-#define __PT_RC_REG a5
+#define __PT_RC_REG a0
 #define __PT_SP_REG sp
 #define __PT_IP_REG pc
 /* riscv does not select ARCH_HAS_SYSCALL_WRAPPER. */
-- 
2.35.1