From: Jiong Wang <jiong.wang@netronome.com>
To: alexei.starovoitov@gmail.com, daniel@iogearbox.net
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org,
oss-drivers@netronome.com, Jiong Wang <jiong.wang@netronome.com>,
Wang YanQing <udknight@gmail.com>
Subject: [PATCH v4 bpf-next 13/15] x32: bpf: eliminate zero extension code-gen
Date: Mon, 15 Apr 2019 18:26:23 +0100 [thread overview]
Message-ID: <1555349185-12508-14-git-send-email-jiong.wang@netronome.com> (raw)
In-Reply-To: <1555349185-12508-1-git-send-email-jiong.wang@netronome.com>
Cc: Wang YanQing <udknight@gmail.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
---
arch/x86/net/bpf_jit_comp32.c | 32 ++++++++++++++++++++++----------
1 file changed, 22 insertions(+), 10 deletions(-)
diff --git a/arch/x86/net/bpf_jit_comp32.c b/arch/x86/net/bpf_jit_comp32.c
index 0d9cdff..8c6cf22 100644
--- a/arch/x86/net/bpf_jit_comp32.c
+++ b/arch/x86/net/bpf_jit_comp32.c
@@ -567,7 +567,7 @@ static inline void emit_ia32_alu_r(const bool is64, const bool hi, const u8 op,
static inline void emit_ia32_alu_r64(const bool is64, const u8 op,
const u8 dst[], const u8 src[],
bool dstk, bool sstk,
- u8 **pprog)
+ u8 **pprog, const struct bpf_prog_aux *aux)
{
u8 *prog = *pprog;
@@ -575,7 +575,7 @@ static inline void emit_ia32_alu_r64(const bool is64, const u8 op,
if (is64)
emit_ia32_alu_r(is64, true, op, dst_hi, src_hi, dstk, sstk,
&prog);
- else
+ else if (aux->no_verifier_zext)
emit_ia32_mov_i(dst_hi, 0, dstk, &prog);
*pprog = prog;
}
@@ -666,7 +666,8 @@ static inline void emit_ia32_alu_i(const bool is64, const bool hi, const u8 op,
/* ALU operation (64 bit) */
static inline void emit_ia32_alu_i64(const bool is64, const u8 op,
const u8 dst[], const u32 val,
- bool dstk, u8 **pprog)
+ bool dstk, u8 **pprog,
+ const struct bpf_prog_aux *aux)
{
u8 *prog = *pprog;
u32 hi = 0;
@@ -677,7 +678,7 @@ static inline void emit_ia32_alu_i64(const bool is64, const u8 op,
emit_ia32_alu_i(is64, false, op, dst_lo, val, dstk, &prog);
if (is64)
emit_ia32_alu_i(is64, true, op, dst_hi, hi, dstk, &prog);
- else
+ else if (aux->no_verifier_zext)
emit_ia32_mov_i(dst_hi, 0, dstk, &prog);
*pprog = prog;
@@ -1690,11 +1691,13 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
switch (BPF_SRC(code)) {
case BPF_X:
emit_ia32_alu_r64(is64, BPF_OP(code), dst,
- src, dstk, sstk, &prog);
+ src, dstk, sstk, &prog,
+ bpf_prog->aux);
break;
case BPF_K:
emit_ia32_alu_i64(is64, BPF_OP(code), dst,
- imm32, dstk, &prog);
+ imm32, dstk, &prog,
+ bpf_prog->aux);
break;
}
break;
@@ -1713,7 +1716,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
false, &prog);
break;
}
- emit_ia32_mov_i(dst_hi, 0, dstk, &prog);
+ if (bpf_prog->aux->no_verifier_zext)
+ emit_ia32_mov_i(dst_hi, 0, dstk, &prog);
break;
case BPF_ALU | BPF_LSH | BPF_X:
case BPF_ALU | BPF_RSH | BPF_X:
@@ -1733,7 +1737,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
&prog);
break;
}
- emit_ia32_mov_i(dst_hi, 0, dstk, &prog);
+ if (bpf_prog->aux->no_verifier_zext)
+ emit_ia32_mov_i(dst_hi, 0, dstk, &prog);
break;
/* dst = dst / src(imm) */
/* dst = dst % src(imm) */
@@ -1755,7 +1760,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
&prog);
break;
}
- emit_ia32_mov_i(dst_hi, 0, dstk, &prog);
+ if (bpf_prog->aux->no_verifier_zext)
+ emit_ia32_mov_i(dst_hi, 0, dstk, &prog);
break;
case BPF_ALU64 | BPF_DIV | BPF_K:
case BPF_ALU64 | BPF_DIV | BPF_X:
@@ -1772,7 +1778,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
EMIT2_off32(0xC7, add_1reg(0xC0, IA32_ECX), imm32);
emit_ia32_shift_r(BPF_OP(code), dst_lo, IA32_ECX, dstk,
false, &prog);
- emit_ia32_mov_i(dst_hi, 0, dstk, &prog);
+ if (bpf_prog->aux->no_verifier_zext)
+ emit_ia32_mov_i(dst_hi, 0, dstk, &prog);
break;
/* dst = dst << imm */
case BPF_ALU64 | BPF_LSH | BPF_K:
@@ -2367,6 +2374,11 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
return proglen;
}
+bool bpf_jit_hardware_zext(void)
+{
+ return false;
+}
+
struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
{
struct bpf_binary_header *header = NULL;
--
2.7.4
next prev parent reply other threads:[~2019-04-15 17:26 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-15 17:26 [PATCH v4 bpf-next 00/15] bpf: eliminate zero extensions for sub-register writes Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 01/15] bpf: split read liveness into REG_LIVE_READ64 and REG_LIVE_READ32 Jiong Wang
2019-04-15 23:03 ` Jakub Kicinski
2019-04-16 1:26 ` Alexei Starovoitov
2019-04-16 7:39 ` Jiong Wang
2019-04-16 16:20 ` Alexei Starovoitov
2019-04-16 20:19 ` Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 02/15] bpf: mark lo32 writes that should be zero extended into hi32 Jiong Wang
2019-04-18 23:57 ` Alexei Starovoitov
2019-04-19 20:40 ` Jakub Kicinski
2019-04-19 21:14 ` Alexei Starovoitov
2019-04-19 21:33 ` Jakub Kicinski
2019-04-19 21:41 ` Alexei Starovoitov
2019-04-19 23:27 ` Jiong Wang
2019-04-19 23:28 ` Alexei Starovoitov
2019-04-15 17:26 ` [PATCH v4 bpf-next 03/15] bpf: reduce false alarm by refining helper call arg types Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 04/15] bpf: insert explicit zero extension insn when hardware doesn't do it implicitly Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 05/15] bpf: introduce new bpf prog load flags "BPF_F_TEST_RND_HI32" Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 06/15] bpf: randomize high 32-bit when BPF_F_TEST_RND_HI32 is set Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 07/15] libbpf: add "prog_flags" to bpf_program/bpf_prog_load_attr/bpf_load_program_attr Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 08/15] selftests: enable hi32 randomization for all tests Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 09/15] arm: bpf: eliminate zero extension code-gen Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 10/15] powerpc: " Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 11/15] s390: " Jiong Wang
2019-04-15 17:26 ` [PATCH v4 bpf-next 12/15] sparc: " Jiong Wang
2019-04-15 17:26 ` Jiong Wang [this message]
2019-04-15 17:26 ` [PATCH v4 bpf-next 14/15] riscv: " Jiong Wang
2019-04-17 7:55 ` Björn Töpel
2019-04-15 17:26 ` [PATCH v4 bpf-next 15/15] nfp: " Jiong Wang
2019-04-24 16:31 ` kbuild test robot
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