From: Daniel Borkmann <daniel@iogearbox.net>
To: ast@kernel.org
Cc: netdev@vger.kernel.org, Daniel Borkmann <daniel@iogearbox.net>
Subject: [PATCH bpf-next 06/13] bpf, arm64: remove obsolete exception handling from div/mod
Date: Fri, 26 Jan 2018 23:33:41 +0100 [thread overview]
Message-ID: <20180126223348.11250-7-daniel@iogearbox.net> (raw)
In-Reply-To: <20180126223348.11250-1-daniel@iogearbox.net>
Since we've changed div/mod exception handling for src_reg in
eBPF verifier itself, remove the leftovers from arm64 JIT.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
---
arch/arm64/net/bpf_jit_comp.c | 13 -------------
1 file changed, 13 deletions(-)
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index 0775d5a..1d4f1da 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -390,18 +390,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
case BPF_ALU64 | BPF_DIV | BPF_X:
case BPF_ALU | BPF_MOD | BPF_X:
case BPF_ALU64 | BPF_MOD | BPF_X:
- {
- const u8 r0 = bpf2a64[BPF_REG_0];
-
- /* if (src == 0) return 0 */
- jmp_offset = 3; /* skip ahead to else path */
- check_imm19(jmp_offset);
- emit(A64_CBNZ(is64, src, jmp_offset), ctx);
- emit(A64_MOVZ(1, r0, 0, 0), ctx);
- jmp_offset = epilogue_offset(ctx);
- check_imm26(jmp_offset);
- emit(A64_B(jmp_offset), ctx);
- /* else */
switch (BPF_OP(code)) {
case BPF_DIV:
emit(A64_UDIV(is64, dst, dst, src), ctx);
@@ -413,7 +401,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
break;
}
break;
- }
case BPF_ALU | BPF_LSH | BPF_X:
case BPF_ALU64 | BPF_LSH | BPF_X:
emit(A64_LSLV(is64, dst, dst, src), ctx);
--
2.9.5
next prev parent reply other threads:[~2018-01-26 22:33 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-26 22:33 [PATCH bpf-next 00/13] BPF improvements and fixes Daniel Borkmann
2018-01-26 22:33 ` [PATCH bpf-next 01/13] bpf: xor of a/x in cbpf can be done in 32 bit alu Daniel Borkmann
2018-01-28 18:58 ` [PATCH bpf-next 01/13] bpf: xor of a/x in cbpf can be done Naveen N. Rao
2018-01-28 20:51 ` Daniel Borkmann
2018-01-26 22:33 ` [PATCH bpf-next 02/13] bpf: improve dead code sanitizing Daniel Borkmann
2018-01-26 22:33 ` [PATCH bpf-next 03/13] bpf: make unknown opcode handling more robust Daniel Borkmann
2018-01-26 22:33 ` [PATCH bpf-next 04/13] bpf: fix subprog verifier bypass by div/mod by 0 exception Daniel Borkmann
2018-01-26 22:33 ` [PATCH bpf-next 05/13] bpf, x86_64: remove obsolete exception handling from div/mod Daniel Borkmann
2018-01-26 22:33 ` Daniel Borkmann [this message]
2018-01-26 22:33 ` [PATCH bpf-next 07/13] bpf, s390x: " Daniel Borkmann
2018-01-29 14:33 ` Michael Holzheu
2018-01-29 15:52 ` Daniel Borkmann
2018-01-26 22:33 ` [PATCH bpf-next 08/13] bpf, ppc64: " Daniel Borkmann
2018-01-28 18:52 ` Naveen N. Rao
2018-01-26 22:33 ` [PATCH bpf-next 09/13] bpf, sparc64: " Daniel Borkmann
2018-01-26 22:33 ` [PATCH bpf-next 10/13] bpf, mips64: " Daniel Borkmann
2018-01-26 22:39 ` David Daney
2018-01-26 22:33 ` [PATCH bpf-next 11/13] bpf, mips64: remove unneeded zero check from div/mod with k Daniel Borkmann
2018-01-26 22:36 ` David Daney
2018-01-26 22:33 ` [PATCH bpf-next 12/13] bpf, arm: remove obsolete exception handling from div/mod Daniel Borkmann
2018-01-26 22:33 ` [PATCH bpf-next 13/13] bpf: add further test cases around div/mod and others Daniel Borkmann
2018-01-27 0:48 ` [PATCH bpf-next 00/13] BPF improvements and fixes Alexei Starovoitov
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