From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
bpf@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>
Subject: [PATCH v1 05/10] powerpc/bpf/32: BPF prog is never called with more than one arg
Date: Thu, 1 Dec 2022 08:56:30 +0100 [thread overview]
Message-ID: <ff9b336d163e4c53c44f2b42166c18f0ad921900.1669881248.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <fa025537f584599c0271fc129c5cf4f57fbe7505.1669881248.git.christophe.leroy@csgroup.eu>
BPF progs are never called with more than one argument, plus the
tail call count as a second argument when needed.
So, no need to retrieve 9th and 10th argument (5th 64 bits argument)
from the stack in prologue.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/net/bpf_jit_comp32.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/arch/powerpc/net/bpf_jit_comp32.c b/arch/powerpc/net/bpf_jit_comp32.c
index 7f54d37bede6..7c129fe810f5 100644
--- a/arch/powerpc/net/bpf_jit_comp32.c
+++ b/arch/powerpc/net/bpf_jit_comp32.c
@@ -159,12 +159,6 @@ void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx)
if (bpf_is_seen_register(ctx, i))
EMIT(PPC_RAW_STW(i, _R1, bpf_jit_stack_offsetof(ctx, i)));
- /* If needed retrieve arguments 9 and 10, ie 5th 64 bits arg.*/
- if (bpf_is_seen_register(ctx, bpf_to_ppc(BPF_REG_5))) {
- EMIT(PPC_RAW_LWZ(bpf_to_ppc(BPF_REG_5) - 1, _R1, BPF_PPC_STACKFRAME(ctx)) + 8);
- EMIT(PPC_RAW_LWZ(bpf_to_ppc(BPF_REG_5), _R1, BPF_PPC_STACKFRAME(ctx)) + 12);
- }
-
/* Setup frame pointer to point to the bpf stack area */
if (bpf_is_seen_register(ctx, bpf_to_ppc(BPF_REG_FP))) {
EMIT(PPC_RAW_LI(bpf_to_ppc(BPF_REG_FP) - 1, 0));
--
2.38.1
next prev parent reply other threads:[~2022-12-01 7:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-01 7:56 [PATCH v1 01/10] powerpc/bpf/32: Fix Oops on tail call tests Christophe Leroy
2022-12-01 7:56 ` [PATCH v1 02/10] powerpc: Remove __kernel_text_address() in show_instructions() Christophe Leroy
2022-12-01 7:56 ` [PATCH v1 03/10] powerpc/bpf/32: No need to zeroise r4 when not doing tail call Christophe Leroy
2022-12-01 7:56 ` [PATCH v1 04/10] powerpc/bpf/32: Only set a stack frame when necessary Christophe Leroy
2022-12-01 7:56 ` Christophe Leroy [this message]
2022-12-01 7:56 ` [PATCH v1 06/10] powerpc/bpf: Perform complete extra passes to update addresses Christophe Leroy
2022-12-13 10:23 ` Naveen N. Rao
2022-12-19 19:06 ` Christophe Leroy
2023-01-10 8:44 ` Naveen N. Rao
2023-01-31 9:52 ` Christophe Leroy
2022-12-01 7:56 ` [PATCH v1 07/10] powerpc/bpf: Only pad length-variable code at initial pass Christophe Leroy
2022-12-01 7:56 ` [PATCH v1 08/10] powerpc/bpf/32: Optimise some particular const operations Christophe Leroy
2022-12-01 7:56 ` [PATCH v1 09/10] powerpc/bpf/32: introduce a second source register for ALU operations Christophe Leroy
2022-12-01 7:56 ` [PATCH v1 10/10] powerpc/bpf/32: perform three operands " Christophe Leroy
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