netdev - [PATCH bpf-next v4 08/16] x86_64: bpf: implement jitting of JMP32

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Message-Id: <1548523574-18316-9-git-send-email-jiong.wang@netronome.com>
Date:   Sat, 26 Jan 2019 12:26:06 -0500
From:   Jiong Wang <jiong.wang@...ronome.com>
To:     ast@...nel.org, daniel@...earbox.net
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        Jiong Wang <jiong.wang@...ronome.com>
Subject: [PATCH bpf-next v4 08/16] x86_64: bpf: implement jitting of JMP32

This patch implements code-gen for new JMP32 instructions on x86_64.

Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Signed-off-by: Jiong Wang <jiong.wang@...ronome.com>
---
 arch/x86/net/bpf_jit_comp.c | 46 +++++++++++++++++++++++++++++++++++++++------
 1 file changed, 40 insertions(+), 6 deletions(-)

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 5542303..afabf59 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -881,20 +881,41 @@ xadd:			if (is_imm8(insn->off))
 		case BPF_JMP | BPF_JSLT | BPF_X:
 		case BPF_JMP | BPF_JSGE | BPF_X:
 		case BPF_JMP | BPF_JSLE | BPF_X:
+		case BPF_JMP32 | BPF_JEQ | BPF_X:
+		case BPF_JMP32 | BPF_JNE | BPF_X:
+		case BPF_JMP32 | BPF_JGT | BPF_X:
+		case BPF_JMP32 | BPF_JLT | BPF_X:
+		case BPF_JMP32 | BPF_JGE | BPF_X:
+		case BPF_JMP32 | BPF_JLE | BPF_X:
+		case BPF_JMP32 | BPF_JSGT | BPF_X:
+		case BPF_JMP32 | BPF_JSLT | BPF_X:
+		case BPF_JMP32 | BPF_JSGE | BPF_X:
+		case BPF_JMP32 | BPF_JSLE | BPF_X:
 			/* cmp dst_reg, src_reg */
-			EMIT3(add_2mod(0x48, dst_reg, src_reg), 0x39,
-			      add_2reg(0xC0, dst_reg, src_reg));
+			if (BPF_CLASS(insn->code) == BPF_JMP)
+				EMIT1(add_2mod(0x48, dst_reg, src_reg));
+			else if (is_ereg(dst_reg) || is_ereg(src_reg))
+				EMIT1(add_2mod(0x40, dst_reg, src_reg));
+			EMIT2(0x39, add_2reg(0xC0, dst_reg, src_reg));
 			goto emit_cond_jmp;
 
 		case BPF_JMP | BPF_JSET | BPF_X:
+		case BPF_JMP32 | BPF_JSET | BPF_X:
 			/* test dst_reg, src_reg */
-			EMIT3(add_2mod(0x48, dst_reg, src_reg), 0x85,
-			      add_2reg(0xC0, dst_reg, src_reg));
+			if (BPF_CLASS(insn->code) == BPF_JMP)
+				EMIT1(add_2mod(0x48, dst_reg, src_reg));
+			else if (is_ereg(dst_reg) || is_ereg(src_reg))
+				EMIT1(add_2mod(0x40, dst_reg, src_reg));
+			EMIT2(0x85, add_2reg(0xC0, dst_reg, src_reg));
 			goto emit_cond_jmp;
 
 		case BPF_JMP | BPF_JSET | BPF_K:
+		case BPF_JMP32 | BPF_JSET | BPF_K:
 			/* test dst_reg, imm32 */
-			EMIT1(add_1mod(0x48, dst_reg));
+			if (BPF_CLASS(insn->code) == BPF_JMP)
+				EMIT1(add_1mod(0x48, dst_reg));
+			else if (is_ereg(dst_reg))
+				EMIT1(add_1mod(0x40, dst_reg));
 			EMIT2_off32(0xF7, add_1reg(0xC0, dst_reg), imm32);
 			goto emit_cond_jmp;
 
@@ -908,8 +929,21 @@ xadd:			if (is_imm8(insn->off))
 		case BPF_JMP | BPF_JSLT | BPF_K:
 		case BPF_JMP | BPF_JSGE | BPF_K:
 		case BPF_JMP | BPF_JSLE | BPF_K:
+		case BPF_JMP32 | BPF_JEQ | BPF_K:
+		case BPF_JMP32 | BPF_JNE | BPF_K:
+		case BPF_JMP32 | BPF_JGT | BPF_K:
+		case BPF_JMP32 | BPF_JLT | BPF_K:
+		case BPF_JMP32 | BPF_JGE | BPF_K:
+		case BPF_JMP32 | BPF_JLE | BPF_K:
+		case BPF_JMP32 | BPF_JSGT | BPF_K:
+		case BPF_JMP32 | BPF_JSLT | BPF_K:
+		case BPF_JMP32 | BPF_JSGE | BPF_K:
+		case BPF_JMP32 | BPF_JSLE | BPF_K:
 			/* cmp dst_reg, imm8/32 */
-			EMIT1(add_1mod(0x48, dst_reg));
+			if (BPF_CLASS(insn->code) == BPF_JMP)
+				EMIT1(add_1mod(0x48, dst_reg));
+			else if (is_ereg(dst_reg))
+				EMIT1(add_1mod(0x40, dst_reg));
 
 			if (is_imm8(imm32))
 				EMIT3(0x83, add_1reg(0xF8, dst_reg), imm32);
-- 
2.7.4