This is a note to let you know that I've just added the patch titled
libbpf, riscv: Use a0 for RC register
to the 5.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
libbpf-riscv-use-a0-for-rc-register.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a690b53d7cdc64bf8a06d0f1be92258747fdae8a
Author: Yixun Lan <dlan@xxxxxxxxxx>
Date: Wed Jul 6 22:02:04 2022 +0800
libbpf, riscv: Use a0 for RC register
[ 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@xxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Acked-by: Björn Töpel <bjorn@xxxxxxxxxx>
Acked-by: Amjad OULED-AMEUR <ouledameur.amjad@xxxxxxxxx>
Link: https://lore.kernel.org/bpf/20220706140204.47926-1-dlan@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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. */
