From 69f827eb6e14bdc9c7894fba3a00ca93aaa98a73 Mon Sep 17 00:00:00 2001 From: Jiong Wang Date: Sat, 26 Jan 2019 12:26:07 -0500 Subject: x32: bpf: implement jitting of JMP32 This patch implements code-gen for new JMP32 instructions on x32. Also fixed several reverse xmas tree coding style issues as I am there. Cc: Wang YanQing Signed-off-by: Jiong Wang Signed-off-by: Alexei Starovoitov --- arch/x86/net/bpf_jit_comp32.c | 121 +++++++++++++++++++++++++++++------------- 1 file changed, 85 insertions(+), 36 deletions(-) (limited to 'arch/x86/net') diff --git a/arch/x86/net/bpf_jit_comp32.c b/arch/x86/net/bpf_jit_comp32.c index 8f6cc71e0848..0d9cdffce6ac 100644 --- a/arch/x86/net/bpf_jit_comp32.c +++ b/arch/x86/net/bpf_jit_comp32.c @@ -2072,7 +2072,18 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, case BPF_JMP | BPF_JSGT | BPF_X: case BPF_JMP | BPF_JSLE | BPF_X: case BPF_JMP | BPF_JSLT | BPF_X: - case BPF_JMP | BPF_JSGE | BPF_X: { + case BPF_JMP | BPF_JSGE | 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_JSLE | BPF_X: + case BPF_JMP32 | BPF_JSLT | BPF_X: + case BPF_JMP32 | BPF_JSGE | BPF_X: { + bool is_jmp64 = BPF_CLASS(insn->code) == BPF_JMP; u8 dreg_lo = dstk ? IA32_EAX : dst_lo; u8 dreg_hi = dstk ? IA32_EDX : dst_hi; u8 sreg_lo = sstk ? IA32_ECX : src_lo; @@ -2081,25 +2092,35 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, if (dstk) { EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EAX), STACK_VAR(dst_lo)); - EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EDX), - STACK_VAR(dst_hi)); + if (is_jmp64) + EMIT3(0x8B, + add_2reg(0x40, IA32_EBP, + IA32_EDX), + STACK_VAR(dst_hi)); } if (sstk) { EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_ECX), STACK_VAR(src_lo)); - EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EBX), - STACK_VAR(src_hi)); + if (is_jmp64) + EMIT3(0x8B, + add_2reg(0x40, IA32_EBP, + IA32_EBX), + STACK_VAR(src_hi)); } - /* cmp dreg_hi,sreg_hi */ - EMIT2(0x39, add_2reg(0xC0, dreg_hi, sreg_hi)); - EMIT2(IA32_JNE, 2); + if (is_jmp64) { + /* cmp dreg_hi,sreg_hi */ + EMIT2(0x39, add_2reg(0xC0, dreg_hi, sreg_hi)); + EMIT2(IA32_JNE, 2); + } /* cmp dreg_lo,sreg_lo */ EMIT2(0x39, add_2reg(0xC0, dreg_lo, sreg_lo)); goto emit_cond_jmp; } - case BPF_JMP | BPF_JSET | BPF_X: { + case BPF_JMP | BPF_JSET | BPF_X: + case BPF_JMP32 | BPF_JSET | BPF_X: { + bool is_jmp64 = BPF_CLASS(insn->code) == BPF_JMP; u8 dreg_lo = dstk ? IA32_EAX : dst_lo; u8 dreg_hi = dstk ? IA32_EDX : dst_hi; u8 sreg_lo = sstk ? IA32_ECX : src_lo; @@ -2108,15 +2129,21 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, if (dstk) { EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EAX), STACK_VAR(dst_lo)); - EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EDX), - STACK_VAR(dst_hi)); + if (is_jmp64) + EMIT3(0x8B, + add_2reg(0x40, IA32_EBP, + IA32_EDX), + STACK_VAR(dst_hi)); } if (sstk) { EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_ECX), STACK_VAR(src_lo)); - EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EBX), - STACK_VAR(src_hi)); + if (is_jmp64) + EMIT3(0x8B, + add_2reg(0x40, IA32_EBP, + IA32_EBX), + STACK_VAR(src_hi)); } /* and dreg_lo,sreg_lo */ EMIT2(0x23, add_2reg(0xC0, sreg_lo, dreg_lo)); @@ -2126,32 +2153,39 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, EMIT2(0x09, add_2reg(0xC0, dreg_lo, dreg_hi)); goto emit_cond_jmp; } - case BPF_JMP | BPF_JSET | BPF_K: { - u32 hi; + case BPF_JMP | BPF_JSET | BPF_K: + case BPF_JMP32 | BPF_JSET | BPF_K: { + bool is_jmp64 = BPF_CLASS(insn->code) == BPF_JMP; u8 dreg_lo = dstk ? IA32_EAX : dst_lo; u8 dreg_hi = dstk ? IA32_EDX : dst_hi; u8 sreg_lo = IA32_ECX; u8 sreg_hi = IA32_EBX; + u32 hi; if (dstk) { EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EAX), STACK_VAR(dst_lo)); - EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EDX), - STACK_VAR(dst_hi)); + if (is_jmp64) + EMIT3(0x8B, + add_2reg(0x40, IA32_EBP, + IA32_EDX), + STACK_VAR(dst_hi)); } - hi = imm32 & (1<<31) ? (u32)~0 : 0; /* mov ecx,imm32 */ - EMIT2_off32(0xC7, add_1reg(0xC0, IA32_ECX), imm32); - /* mov ebx,imm32 */ - EMIT2_off32(0xC7, add_1reg(0xC0, IA32_EBX), hi); + EMIT2_off32(0xC7, add_1reg(0xC0, sreg_lo), imm32); /* and dreg_lo,sreg_lo */ EMIT2(0x23, add_2reg(0xC0, sreg_lo, dreg_lo)); - /* and dreg_hi,sreg_hi */ - EMIT2(0x23, add_2reg(0xC0, sreg_hi, dreg_hi)); - /* or dreg_lo,dreg_hi */ - EMIT2(0x09, add_2reg(0xC0, dreg_lo, dreg_hi)); + if (is_jmp64) { + hi = imm32 & (1 << 31) ? (u32)~0 : 0; + /* mov ebx,imm32 */ + EMIT2_off32(0xC7, add_1reg(0xC0, sreg_hi), hi); + /* and dreg_hi,sreg_hi */ + EMIT2(0x23, add_2reg(0xC0, sreg_hi, dreg_hi)); + /* or dreg_lo,dreg_hi */ + EMIT2(0x09, add_2reg(0xC0, dreg_lo, dreg_hi)); + } goto emit_cond_jmp; } case BPF_JMP | BPF_JEQ | BPF_K: @@ -2163,29 +2197,44 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, case BPF_JMP | BPF_JSGT | BPF_K: case BPF_JMP | BPF_JSLE | BPF_K: case BPF_JMP | BPF_JSLT | BPF_K: - case BPF_JMP | BPF_JSGE | BPF_K: { - u32 hi; + case BPF_JMP | BPF_JSGE | 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_JSLE | BPF_K: + case BPF_JMP32 | BPF_JSLT | BPF_K: + case BPF_JMP32 | BPF_JSGE | BPF_K: { + bool is_jmp64 = BPF_CLASS(insn->code) == BPF_JMP; u8 dreg_lo = dstk ? IA32_EAX : dst_lo; u8 dreg_hi = dstk ? IA32_EDX : dst_hi; u8 sreg_lo = IA32_ECX; u8 sreg_hi = IA32_EBX; + u32 hi; if (dstk) { EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EAX), STACK_VAR(dst_lo)); - EMIT3(0x8B, add_2reg(0x40, IA32_EBP, IA32_EDX), - STACK_VAR(dst_hi)); + if (is_jmp64) + EMIT3(0x8B, + add_2reg(0x40, IA32_EBP, + IA32_EDX), + STACK_VAR(dst_hi)); } - hi = imm32 & (1<<31) ? (u32)~0 : 0; /* mov ecx,imm32 */ EMIT2_off32(0xC7, add_1reg(0xC0, IA32_ECX), imm32); - /* mov ebx,imm32 */ - EMIT2_off32(0xC7, add_1reg(0xC0, IA32_EBX), hi); - - /* cmp dreg_hi,sreg_hi */ - EMIT2(0x39, add_2reg(0xC0, dreg_hi, sreg_hi)); - EMIT2(IA32_JNE, 2); + if (is_jmp64) { + hi = imm32 & (1 << 31) ? (u32)~0 : 0; + /* mov ebx,imm32 */ + EMIT2_off32(0xC7, add_1reg(0xC0, IA32_EBX), hi); + /* cmp dreg_hi,sreg_hi */ + EMIT2(0x39, add_2reg(0xC0, dreg_hi, sreg_hi)); + EMIT2(IA32_JNE, 2); + } /* cmp dreg_lo,sreg_lo */ EMIT2(0x39, add_2reg(0xC0, dreg_lo, sreg_lo)); -- cgit v1.2.1