10a14842fSEric Dumazet /* bpf_jit_comp.c : BPF JIT compiler 20a14842fSEric Dumazet * 33b58908aSEric Dumazet * Copyright (C) 2011-2013 Eric Dumazet (eric.dumazet@gmail.com) 462258278SAlexei Starovoitov * Internal BPF Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com 50a14842fSEric Dumazet * 60a14842fSEric Dumazet * This program is free software; you can redistribute it and/or 70a14842fSEric Dumazet * modify it under the terms of the GNU General Public License 80a14842fSEric Dumazet * as published by the Free Software Foundation; version 2 90a14842fSEric Dumazet * of the License. 100a14842fSEric Dumazet */ 110a14842fSEric Dumazet #include <linux/netdevice.h> 120a14842fSEric Dumazet #include <linux/filter.h> 13855ddb56SEric Dumazet #include <linux/if_vlan.h> 14738cbe72SDaniel Borkmann #include <asm/cacheflush.h> 15b52f00e6SAlexei Starovoitov #include <linux/bpf.h> 160a14842fSEric Dumazet 170a14842fSEric Dumazet int bpf_jit_enable __read_mostly; 180a14842fSEric Dumazet 190a14842fSEric Dumazet /* 200a14842fSEric Dumazet * assembly code in arch/x86/net/bpf_jit.S 210a14842fSEric Dumazet */ 2262258278SAlexei Starovoitov extern u8 sk_load_word[], sk_load_half[], sk_load_byte[]; 23a998d434SJan Seiffert extern u8 sk_load_word_positive_offset[], sk_load_half_positive_offset[]; 2462258278SAlexei Starovoitov extern u8 sk_load_byte_positive_offset[]; 25a998d434SJan Seiffert extern u8 sk_load_word_negative_offset[], sk_load_half_negative_offset[]; 2662258278SAlexei Starovoitov extern u8 sk_load_byte_negative_offset[]; 270a14842fSEric Dumazet 285cccc702SJoe Perches static u8 *emit_code(u8 *ptr, u32 bytes, unsigned int len) 290a14842fSEric Dumazet { 300a14842fSEric Dumazet if (len == 1) 310a14842fSEric Dumazet *ptr = bytes; 320a14842fSEric Dumazet else if (len == 2) 330a14842fSEric Dumazet *(u16 *)ptr = bytes; 340a14842fSEric Dumazet else { 350a14842fSEric Dumazet *(u32 *)ptr = bytes; 360a14842fSEric Dumazet barrier(); 370a14842fSEric Dumazet } 380a14842fSEric Dumazet return ptr + len; 390a14842fSEric Dumazet } 400a14842fSEric Dumazet 41b52f00e6SAlexei Starovoitov #define EMIT(bytes, len) \ 42b52f00e6SAlexei Starovoitov do { prog = emit_code(prog, bytes, len); cnt += len; } while (0) 430a14842fSEric Dumazet 440a14842fSEric Dumazet #define EMIT1(b1) EMIT(b1, 1) 450a14842fSEric Dumazet #define EMIT2(b1, b2) EMIT((b1) + ((b2) << 8), 2) 460a14842fSEric Dumazet #define EMIT3(b1, b2, b3) EMIT((b1) + ((b2) << 8) + ((b3) << 16), 3) 470a14842fSEric Dumazet #define EMIT4(b1, b2, b3, b4) EMIT((b1) + ((b2) << 8) + ((b3) << 16) + ((b4) << 24), 4) 4862258278SAlexei Starovoitov #define EMIT1_off32(b1, off) \ 4962258278SAlexei Starovoitov do {EMIT1(b1); EMIT(off, 4); } while (0) 5062258278SAlexei Starovoitov #define EMIT2_off32(b1, b2, off) \ 5162258278SAlexei Starovoitov do {EMIT2(b1, b2); EMIT(off, 4); } while (0) 5262258278SAlexei Starovoitov #define EMIT3_off32(b1, b2, b3, off) \ 5362258278SAlexei Starovoitov do {EMIT3(b1, b2, b3); EMIT(off, 4); } while (0) 5462258278SAlexei Starovoitov #define EMIT4_off32(b1, b2, b3, b4, off) \ 5562258278SAlexei Starovoitov do {EMIT4(b1, b2, b3, b4); EMIT(off, 4); } while (0) 560a14842fSEric Dumazet 575cccc702SJoe Perches static bool is_imm8(int value) 580a14842fSEric Dumazet { 590a14842fSEric Dumazet return value <= 127 && value >= -128; 600a14842fSEric Dumazet } 610a14842fSEric Dumazet 625cccc702SJoe Perches static bool is_simm32(s64 value) 630a14842fSEric Dumazet { 6462258278SAlexei Starovoitov return value == (s64) (s32) value; 650a14842fSEric Dumazet } 660a14842fSEric Dumazet 67e430f34eSAlexei Starovoitov /* mov dst, src */ 68e430f34eSAlexei Starovoitov #define EMIT_mov(DST, SRC) \ 69e430f34eSAlexei Starovoitov do {if (DST != SRC) \ 70e430f34eSAlexei Starovoitov EMIT3(add_2mod(0x48, DST, SRC), 0x89, add_2reg(0xC0, DST, SRC)); \ 710a14842fSEric Dumazet } while (0) 720a14842fSEric Dumazet 7362258278SAlexei Starovoitov static int bpf_size_to_x86_bytes(int bpf_size) 7462258278SAlexei Starovoitov { 7562258278SAlexei Starovoitov if (bpf_size == BPF_W) 7662258278SAlexei Starovoitov return 4; 7762258278SAlexei Starovoitov else if (bpf_size == BPF_H) 7862258278SAlexei Starovoitov return 2; 7962258278SAlexei Starovoitov else if (bpf_size == BPF_B) 8062258278SAlexei Starovoitov return 1; 8162258278SAlexei Starovoitov else if (bpf_size == BPF_DW) 8262258278SAlexei Starovoitov return 4; /* imm32 */ 8362258278SAlexei Starovoitov else 8462258278SAlexei Starovoitov return 0; 8562258278SAlexei Starovoitov } 8662258278SAlexei Starovoitov 870a14842fSEric Dumazet /* list of x86 cond jumps opcodes (. + s8) 880a14842fSEric Dumazet * Add 0x10 (and an extra 0x0f) to generate far jumps (. + s32) 890a14842fSEric Dumazet */ 900a14842fSEric Dumazet #define X86_JB 0x72 910a14842fSEric Dumazet #define X86_JAE 0x73 920a14842fSEric Dumazet #define X86_JE 0x74 930a14842fSEric Dumazet #define X86_JNE 0x75 940a14842fSEric Dumazet #define X86_JBE 0x76 950a14842fSEric Dumazet #define X86_JA 0x77 9662258278SAlexei Starovoitov #define X86_JGE 0x7D 9762258278SAlexei Starovoitov #define X86_JG 0x7F 980a14842fSEric Dumazet 995cccc702SJoe Perches static void bpf_flush_icache(void *start, void *end) 1000a14842fSEric Dumazet { 1010a14842fSEric Dumazet mm_segment_t old_fs = get_fs(); 1020a14842fSEric Dumazet 1030a14842fSEric Dumazet set_fs(KERNEL_DS); 1040a14842fSEric Dumazet smp_wmb(); 1050a14842fSEric Dumazet flush_icache_range((unsigned long)start, (unsigned long)end); 1060a14842fSEric Dumazet set_fs(old_fs); 1070a14842fSEric Dumazet } 1080a14842fSEric Dumazet 109a998d434SJan Seiffert #define CHOOSE_LOAD_FUNC(K, func) \ 110a998d434SJan Seiffert ((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative_offset : func) : func##_positive_offset) 1110a14842fSEric Dumazet 11262258278SAlexei Starovoitov /* pick a register outside of BPF range for JIT internal work */ 11362258278SAlexei Starovoitov #define AUX_REG (MAX_BPF_REG + 1) 11462258278SAlexei Starovoitov 11562258278SAlexei Starovoitov /* the following table maps BPF registers to x64 registers. 11662258278SAlexei Starovoitov * x64 register r12 is unused, since if used as base address register 11762258278SAlexei Starovoitov * in load/store instructions, it always needs an extra byte of encoding 11862258278SAlexei Starovoitov */ 11962258278SAlexei Starovoitov static const int reg2hex[] = { 12062258278SAlexei Starovoitov [BPF_REG_0] = 0, /* rax */ 12162258278SAlexei Starovoitov [BPF_REG_1] = 7, /* rdi */ 12262258278SAlexei Starovoitov [BPF_REG_2] = 6, /* rsi */ 12362258278SAlexei Starovoitov [BPF_REG_3] = 2, /* rdx */ 12462258278SAlexei Starovoitov [BPF_REG_4] = 1, /* rcx */ 12562258278SAlexei Starovoitov [BPF_REG_5] = 0, /* r8 */ 12662258278SAlexei Starovoitov [BPF_REG_6] = 3, /* rbx callee saved */ 12762258278SAlexei Starovoitov [BPF_REG_7] = 5, /* r13 callee saved */ 12862258278SAlexei Starovoitov [BPF_REG_8] = 6, /* r14 callee saved */ 12962258278SAlexei Starovoitov [BPF_REG_9] = 7, /* r15 callee saved */ 13062258278SAlexei Starovoitov [BPF_REG_FP] = 5, /* rbp readonly */ 13162258278SAlexei Starovoitov [AUX_REG] = 3, /* r11 temp register */ 13262258278SAlexei Starovoitov }; 13362258278SAlexei Starovoitov 13462258278SAlexei Starovoitov /* is_ereg() == true if BPF register 'reg' maps to x64 r8..r15 13562258278SAlexei Starovoitov * which need extra byte of encoding. 13662258278SAlexei Starovoitov * rax,rcx,...,rbp have simpler encoding 13762258278SAlexei Starovoitov */ 1385cccc702SJoe Perches static bool is_ereg(u32 reg) 13962258278SAlexei Starovoitov { 140d148134bSJoe Perches return (1 << reg) & (BIT(BPF_REG_5) | 141d148134bSJoe Perches BIT(AUX_REG) | 142d148134bSJoe Perches BIT(BPF_REG_7) | 143d148134bSJoe Perches BIT(BPF_REG_8) | 144d148134bSJoe Perches BIT(BPF_REG_9)); 14562258278SAlexei Starovoitov } 14662258278SAlexei Starovoitov 14762258278SAlexei Starovoitov /* add modifiers if 'reg' maps to x64 registers r8..r15 */ 1485cccc702SJoe Perches static u8 add_1mod(u8 byte, u32 reg) 14962258278SAlexei Starovoitov { 15062258278SAlexei Starovoitov if (is_ereg(reg)) 15162258278SAlexei Starovoitov byte |= 1; 15262258278SAlexei Starovoitov return byte; 15362258278SAlexei Starovoitov } 15462258278SAlexei Starovoitov 1555cccc702SJoe Perches static u8 add_2mod(u8 byte, u32 r1, u32 r2) 15662258278SAlexei Starovoitov { 15762258278SAlexei Starovoitov if (is_ereg(r1)) 15862258278SAlexei Starovoitov byte |= 1; 15962258278SAlexei Starovoitov if (is_ereg(r2)) 16062258278SAlexei Starovoitov byte |= 4; 16162258278SAlexei Starovoitov return byte; 16262258278SAlexei Starovoitov } 16362258278SAlexei Starovoitov 164e430f34eSAlexei Starovoitov /* encode 'dst_reg' register into x64 opcode 'byte' */ 1655cccc702SJoe Perches static u8 add_1reg(u8 byte, u32 dst_reg) 16662258278SAlexei Starovoitov { 167e430f34eSAlexei Starovoitov return byte + reg2hex[dst_reg]; 16862258278SAlexei Starovoitov } 16962258278SAlexei Starovoitov 170e430f34eSAlexei Starovoitov /* encode 'dst_reg' and 'src_reg' registers into x64 opcode 'byte' */ 1715cccc702SJoe Perches static u8 add_2reg(u8 byte, u32 dst_reg, u32 src_reg) 17262258278SAlexei Starovoitov { 173e430f34eSAlexei Starovoitov return byte + reg2hex[dst_reg] + (reg2hex[src_reg] << 3); 17462258278SAlexei Starovoitov } 17562258278SAlexei Starovoitov 176738cbe72SDaniel Borkmann static void jit_fill_hole(void *area, unsigned int size) 177738cbe72SDaniel Borkmann { 178738cbe72SDaniel Borkmann /* fill whole space with int3 instructions */ 179738cbe72SDaniel Borkmann memset(area, 0xcc, size); 180738cbe72SDaniel Borkmann } 181738cbe72SDaniel Borkmann 182f3c2af7bSAlexei Starovoitov struct jit_context { 183769e0de6SAlexei Starovoitov int cleanup_addr; /* epilogue code offset */ 18462258278SAlexei Starovoitov bool seen_ld_abs; 185f3c2af7bSAlexei Starovoitov }; 186f3c2af7bSAlexei Starovoitov 187e0ee9c12SAlexei Starovoitov /* maximum number of bytes emitted while JITing one eBPF insn */ 188e0ee9c12SAlexei Starovoitov #define BPF_MAX_INSN_SIZE 128 189e0ee9c12SAlexei Starovoitov #define BPF_INSN_SAFETY 64 190e0ee9c12SAlexei Starovoitov 191b52f00e6SAlexei Starovoitov #define STACKSIZE \ 192b52f00e6SAlexei Starovoitov (MAX_BPF_STACK + \ 193b52f00e6SAlexei Starovoitov 32 /* space for rbx, r13, r14, r15 */ + \ 194b52f00e6SAlexei Starovoitov 8 /* space for skb_copy_bits() buffer */) 195b52f00e6SAlexei Starovoitov 196b52f00e6SAlexei Starovoitov #define PROLOGUE_SIZE 51 197b52f00e6SAlexei Starovoitov 198b52f00e6SAlexei Starovoitov /* emit x64 prologue code for BPF program and check it's size. 199b52f00e6SAlexei Starovoitov * bpf_tail_call helper will skip it while jumping into another program 200b52f00e6SAlexei Starovoitov */ 201b52f00e6SAlexei Starovoitov static void emit_prologue(u8 **pprog) 2020a14842fSEric Dumazet { 203b52f00e6SAlexei Starovoitov u8 *prog = *pprog; 204b52f00e6SAlexei Starovoitov int cnt = 0; 2050a14842fSEric Dumazet 20662258278SAlexei Starovoitov EMIT1(0x55); /* push rbp */ 20762258278SAlexei Starovoitov EMIT3(0x48, 0x89, 0xE5); /* mov rbp,rsp */ 2080a14842fSEric Dumazet 209b52f00e6SAlexei Starovoitov /* sub rsp, STACKSIZE */ 210b52f00e6SAlexei Starovoitov EMIT3_off32(0x48, 0x81, 0xEC, STACKSIZE); 2110a14842fSEric Dumazet 21262258278SAlexei Starovoitov /* all classic BPF filters use R6(rbx) save it */ 21362258278SAlexei Starovoitov 21462258278SAlexei Starovoitov /* mov qword ptr [rbp-X],rbx */ 215b52f00e6SAlexei Starovoitov EMIT3_off32(0x48, 0x89, 0x9D, -STACKSIZE); 21662258278SAlexei Starovoitov 2178fb575caSAlexei Starovoitov /* bpf_convert_filter() maps classic BPF register X to R7 and uses R8 21862258278SAlexei Starovoitov * as temporary, so all tcpdump filters need to spill/fill R7(r13) and 21962258278SAlexei Starovoitov * R8(r14). R9(r15) spill could be made conditional, but there is only 22062258278SAlexei Starovoitov * one 'bpf_error' return path out of helper functions inside bpf_jit.S 22162258278SAlexei Starovoitov * The overhead of extra spill is negligible for any filter other 22262258278SAlexei Starovoitov * than synthetic ones. Therefore not worth adding complexity. 2230a14842fSEric Dumazet */ 22462258278SAlexei Starovoitov 22562258278SAlexei Starovoitov /* mov qword ptr [rbp-X],r13 */ 226b52f00e6SAlexei Starovoitov EMIT3_off32(0x4C, 0x89, 0xAD, -STACKSIZE + 8); 22762258278SAlexei Starovoitov /* mov qword ptr [rbp-X],r14 */ 228b52f00e6SAlexei Starovoitov EMIT3_off32(0x4C, 0x89, 0xB5, -STACKSIZE + 16); 22962258278SAlexei Starovoitov /* mov qword ptr [rbp-X],r15 */ 230b52f00e6SAlexei Starovoitov EMIT3_off32(0x4C, 0x89, 0xBD, -STACKSIZE + 24); 23162258278SAlexei Starovoitov 23262258278SAlexei Starovoitov /* clear A and X registers */ 23362258278SAlexei Starovoitov EMIT2(0x31, 0xc0); /* xor eax, eax */ 23462258278SAlexei Starovoitov EMIT3(0x4D, 0x31, 0xED); /* xor r13, r13 */ 23562258278SAlexei Starovoitov 236b52f00e6SAlexei Starovoitov /* clear tail_cnt: mov qword ptr [rbp-X], rax */ 237b52f00e6SAlexei Starovoitov EMIT3_off32(0x48, 0x89, 0x85, -STACKSIZE + 32); 238b52f00e6SAlexei Starovoitov 239b52f00e6SAlexei Starovoitov BUILD_BUG_ON(cnt != PROLOGUE_SIZE); 240b52f00e6SAlexei Starovoitov *pprog = prog; 241b52f00e6SAlexei Starovoitov } 242b52f00e6SAlexei Starovoitov 243b52f00e6SAlexei Starovoitov /* generate the following code: 244b52f00e6SAlexei Starovoitov * ... bpf_tail_call(void *ctx, struct bpf_array *array, u64 index) ... 245b52f00e6SAlexei Starovoitov * if (index >= array->map.max_entries) 246b52f00e6SAlexei Starovoitov * goto out; 247b52f00e6SAlexei Starovoitov * if (++tail_call_cnt > MAX_TAIL_CALL_CNT) 248b52f00e6SAlexei Starovoitov * goto out; 249b52f00e6SAlexei Starovoitov * prog = array->prog[index]; 250b52f00e6SAlexei Starovoitov * if (prog == NULL) 251b52f00e6SAlexei Starovoitov * goto out; 252b52f00e6SAlexei Starovoitov * goto *(prog->bpf_func + prologue_size); 253b52f00e6SAlexei Starovoitov * out: 254b52f00e6SAlexei Starovoitov */ 255b52f00e6SAlexei Starovoitov static void emit_bpf_tail_call(u8 **pprog) 256b52f00e6SAlexei Starovoitov { 257b52f00e6SAlexei Starovoitov u8 *prog = *pprog; 258b52f00e6SAlexei Starovoitov int label1, label2, label3; 259b52f00e6SAlexei Starovoitov int cnt = 0; 260b52f00e6SAlexei Starovoitov 261b52f00e6SAlexei Starovoitov /* rdi - pointer to ctx 262b52f00e6SAlexei Starovoitov * rsi - pointer to bpf_array 263b52f00e6SAlexei Starovoitov * rdx - index in bpf_array 264b52f00e6SAlexei Starovoitov */ 265b52f00e6SAlexei Starovoitov 266b52f00e6SAlexei Starovoitov /* if (index >= array->map.max_entries) 267b52f00e6SAlexei Starovoitov * goto out; 268b52f00e6SAlexei Starovoitov */ 269b52f00e6SAlexei Starovoitov EMIT4(0x48, 0x8B, 0x46, /* mov rax, qword ptr [rsi + 16] */ 270b52f00e6SAlexei Starovoitov offsetof(struct bpf_array, map.max_entries)); 271b52f00e6SAlexei Starovoitov EMIT3(0x48, 0x39, 0xD0); /* cmp rax, rdx */ 2722482abb9SDaniel Borkmann #define OFFSET1 47 /* number of bytes to jump */ 273b52f00e6SAlexei Starovoitov EMIT2(X86_JBE, OFFSET1); /* jbe out */ 274b52f00e6SAlexei Starovoitov label1 = cnt; 275b52f00e6SAlexei Starovoitov 276b52f00e6SAlexei Starovoitov /* if (tail_call_cnt > MAX_TAIL_CALL_CNT) 277b52f00e6SAlexei Starovoitov * goto out; 278b52f00e6SAlexei Starovoitov */ 279b52f00e6SAlexei Starovoitov EMIT2_off32(0x8B, 0x85, -STACKSIZE + 36); /* mov eax, dword ptr [rbp - 516] */ 280b52f00e6SAlexei Starovoitov EMIT3(0x83, 0xF8, MAX_TAIL_CALL_CNT); /* cmp eax, MAX_TAIL_CALL_CNT */ 2812482abb9SDaniel Borkmann #define OFFSET2 36 282b52f00e6SAlexei Starovoitov EMIT2(X86_JA, OFFSET2); /* ja out */ 283b52f00e6SAlexei Starovoitov label2 = cnt; 284b52f00e6SAlexei Starovoitov EMIT3(0x83, 0xC0, 0x01); /* add eax, 1 */ 285b52f00e6SAlexei Starovoitov EMIT2_off32(0x89, 0x85, -STACKSIZE + 36); /* mov dword ptr [rbp - 516], eax */ 286b52f00e6SAlexei Starovoitov 287b52f00e6SAlexei Starovoitov /* prog = array->prog[index]; */ 2882482abb9SDaniel Borkmann EMIT4_off32(0x48, 0x8D, 0x84, 0xD6, /* lea rax, [rsi + rdx * 8 + offsetof(...)] */ 2892482abb9SDaniel Borkmann offsetof(struct bpf_array, prog)); 290b52f00e6SAlexei Starovoitov EMIT3(0x48, 0x8B, 0x00); /* mov rax, qword ptr [rax] */ 291b52f00e6SAlexei Starovoitov 292b52f00e6SAlexei Starovoitov /* if (prog == NULL) 293b52f00e6SAlexei Starovoitov * goto out; 294b52f00e6SAlexei Starovoitov */ 295b52f00e6SAlexei Starovoitov EMIT4(0x48, 0x83, 0xF8, 0x00); /* cmp rax, 0 */ 296b52f00e6SAlexei Starovoitov #define OFFSET3 10 297b52f00e6SAlexei Starovoitov EMIT2(X86_JE, OFFSET3); /* je out */ 298b52f00e6SAlexei Starovoitov label3 = cnt; 299b52f00e6SAlexei Starovoitov 300b52f00e6SAlexei Starovoitov /* goto *(prog->bpf_func + prologue_size); */ 301b52f00e6SAlexei Starovoitov EMIT4(0x48, 0x8B, 0x40, /* mov rax, qword ptr [rax + 32] */ 302b52f00e6SAlexei Starovoitov offsetof(struct bpf_prog, bpf_func)); 303b52f00e6SAlexei Starovoitov EMIT4(0x48, 0x83, 0xC0, PROLOGUE_SIZE); /* add rax, prologue_size */ 304b52f00e6SAlexei Starovoitov 305b52f00e6SAlexei Starovoitov /* now we're ready to jump into next BPF program 306b52f00e6SAlexei Starovoitov * rdi == ctx (1st arg) 307b52f00e6SAlexei Starovoitov * rax == prog->bpf_func + prologue_size 308b52f00e6SAlexei Starovoitov */ 309b52f00e6SAlexei Starovoitov EMIT2(0xFF, 0xE0); /* jmp rax */ 310b52f00e6SAlexei Starovoitov 311b52f00e6SAlexei Starovoitov /* out: */ 312b52f00e6SAlexei Starovoitov BUILD_BUG_ON(cnt - label1 != OFFSET1); 313b52f00e6SAlexei Starovoitov BUILD_BUG_ON(cnt - label2 != OFFSET2); 314b52f00e6SAlexei Starovoitov BUILD_BUG_ON(cnt - label3 != OFFSET3); 315b52f00e6SAlexei Starovoitov *pprog = prog; 316b52f00e6SAlexei Starovoitov } 317b52f00e6SAlexei Starovoitov 318b52f00e6SAlexei Starovoitov static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, 319b52f00e6SAlexei Starovoitov int oldproglen, struct jit_context *ctx) 320b52f00e6SAlexei Starovoitov { 321b52f00e6SAlexei Starovoitov struct bpf_insn *insn = bpf_prog->insnsi; 322b52f00e6SAlexei Starovoitov int insn_cnt = bpf_prog->len; 323b52f00e6SAlexei Starovoitov bool seen_ld_abs = ctx->seen_ld_abs | (oldproglen == 0); 324b52f00e6SAlexei Starovoitov bool seen_exit = false; 325b52f00e6SAlexei Starovoitov u8 temp[BPF_MAX_INSN_SIZE + BPF_INSN_SAFETY]; 326b52f00e6SAlexei Starovoitov int i, cnt = 0; 327b52f00e6SAlexei Starovoitov int proglen = 0; 328b52f00e6SAlexei Starovoitov u8 *prog = temp; 329b52f00e6SAlexei Starovoitov 330b52f00e6SAlexei Starovoitov emit_prologue(&prog); 331b52f00e6SAlexei Starovoitov 332e0ee9c12SAlexei Starovoitov if (seen_ld_abs) { 33362258278SAlexei Starovoitov /* r9d : skb->len - skb->data_len (headlen) 33462258278SAlexei Starovoitov * r10 : skb->data 33562258278SAlexei Starovoitov */ 33662258278SAlexei Starovoitov if (is_imm8(offsetof(struct sk_buff, len))) 33762258278SAlexei Starovoitov /* mov %r9d, off8(%rdi) */ 33862258278SAlexei Starovoitov EMIT4(0x44, 0x8b, 0x4f, 33962258278SAlexei Starovoitov offsetof(struct sk_buff, len)); 34062258278SAlexei Starovoitov else 34162258278SAlexei Starovoitov /* mov %r9d, off32(%rdi) */ 34262258278SAlexei Starovoitov EMIT3_off32(0x44, 0x8b, 0x8f, 34362258278SAlexei Starovoitov offsetof(struct sk_buff, len)); 34462258278SAlexei Starovoitov 3450a14842fSEric Dumazet if (is_imm8(offsetof(struct sk_buff, data_len))) 34662258278SAlexei Starovoitov /* sub %r9d, off8(%rdi) */ 34762258278SAlexei Starovoitov EMIT4(0x44, 0x2b, 0x4f, 34862258278SAlexei Starovoitov offsetof(struct sk_buff, data_len)); 34962258278SAlexei Starovoitov else 35062258278SAlexei Starovoitov EMIT3_off32(0x44, 0x2b, 0x8f, 35162258278SAlexei Starovoitov offsetof(struct sk_buff, data_len)); 3520a14842fSEric Dumazet 3530a14842fSEric Dumazet if (is_imm8(offsetof(struct sk_buff, data))) 35462258278SAlexei Starovoitov /* mov %r10, off8(%rdi) */ 35562258278SAlexei Starovoitov EMIT4(0x4c, 0x8b, 0x57, 35662258278SAlexei Starovoitov offsetof(struct sk_buff, data)); 3570a14842fSEric Dumazet else 35862258278SAlexei Starovoitov /* mov %r10, off32(%rdi) */ 35962258278SAlexei Starovoitov EMIT3_off32(0x4c, 0x8b, 0x97, 36062258278SAlexei Starovoitov offsetof(struct sk_buff, data)); 3610a14842fSEric Dumazet } 36262258278SAlexei Starovoitov 36362258278SAlexei Starovoitov for (i = 0; i < insn_cnt; i++, insn++) { 364e430f34eSAlexei Starovoitov const s32 imm32 = insn->imm; 365e430f34eSAlexei Starovoitov u32 dst_reg = insn->dst_reg; 366e430f34eSAlexei Starovoitov u32 src_reg = insn->src_reg; 36762258278SAlexei Starovoitov u8 b1 = 0, b2 = 0, b3 = 0; 36862258278SAlexei Starovoitov s64 jmp_offset; 36962258278SAlexei Starovoitov u8 jmp_cond; 37062258278SAlexei Starovoitov int ilen; 37162258278SAlexei Starovoitov u8 *func; 37262258278SAlexei Starovoitov 37362258278SAlexei Starovoitov switch (insn->code) { 37462258278SAlexei Starovoitov /* ALU */ 37562258278SAlexei Starovoitov case BPF_ALU | BPF_ADD | BPF_X: 37662258278SAlexei Starovoitov case BPF_ALU | BPF_SUB | BPF_X: 37762258278SAlexei Starovoitov case BPF_ALU | BPF_AND | BPF_X: 37862258278SAlexei Starovoitov case BPF_ALU | BPF_OR | BPF_X: 37962258278SAlexei Starovoitov case BPF_ALU | BPF_XOR | BPF_X: 38062258278SAlexei Starovoitov case BPF_ALU64 | BPF_ADD | BPF_X: 38162258278SAlexei Starovoitov case BPF_ALU64 | BPF_SUB | BPF_X: 38262258278SAlexei Starovoitov case BPF_ALU64 | BPF_AND | BPF_X: 38362258278SAlexei Starovoitov case BPF_ALU64 | BPF_OR | BPF_X: 38462258278SAlexei Starovoitov case BPF_ALU64 | BPF_XOR | BPF_X: 38562258278SAlexei Starovoitov switch (BPF_OP(insn->code)) { 38662258278SAlexei Starovoitov case BPF_ADD: b2 = 0x01; break; 38762258278SAlexei Starovoitov case BPF_SUB: b2 = 0x29; break; 38862258278SAlexei Starovoitov case BPF_AND: b2 = 0x21; break; 38962258278SAlexei Starovoitov case BPF_OR: b2 = 0x09; break; 39062258278SAlexei Starovoitov case BPF_XOR: b2 = 0x31; break; 39162258278SAlexei Starovoitov } 39262258278SAlexei Starovoitov if (BPF_CLASS(insn->code) == BPF_ALU64) 393e430f34eSAlexei Starovoitov EMIT1(add_2mod(0x48, dst_reg, src_reg)); 394e430f34eSAlexei Starovoitov else if (is_ereg(dst_reg) || is_ereg(src_reg)) 395e430f34eSAlexei Starovoitov EMIT1(add_2mod(0x40, dst_reg, src_reg)); 396e430f34eSAlexei Starovoitov EMIT2(b2, add_2reg(0xC0, dst_reg, src_reg)); 3970a14842fSEric Dumazet break; 39862258278SAlexei Starovoitov 399e430f34eSAlexei Starovoitov /* mov dst, src */ 40062258278SAlexei Starovoitov case BPF_ALU64 | BPF_MOV | BPF_X: 401e430f34eSAlexei Starovoitov EMIT_mov(dst_reg, src_reg); 40262258278SAlexei Starovoitov break; 40362258278SAlexei Starovoitov 404e430f34eSAlexei Starovoitov /* mov32 dst, src */ 40562258278SAlexei Starovoitov case BPF_ALU | BPF_MOV | BPF_X: 406e430f34eSAlexei Starovoitov if (is_ereg(dst_reg) || is_ereg(src_reg)) 407e430f34eSAlexei Starovoitov EMIT1(add_2mod(0x40, dst_reg, src_reg)); 408e430f34eSAlexei Starovoitov EMIT2(0x89, add_2reg(0xC0, dst_reg, src_reg)); 40962258278SAlexei Starovoitov break; 41062258278SAlexei Starovoitov 411e430f34eSAlexei Starovoitov /* neg dst */ 41262258278SAlexei Starovoitov case BPF_ALU | BPF_NEG: 41362258278SAlexei Starovoitov case BPF_ALU64 | BPF_NEG: 41462258278SAlexei Starovoitov if (BPF_CLASS(insn->code) == BPF_ALU64) 415e430f34eSAlexei Starovoitov EMIT1(add_1mod(0x48, dst_reg)); 416e430f34eSAlexei Starovoitov else if (is_ereg(dst_reg)) 417e430f34eSAlexei Starovoitov EMIT1(add_1mod(0x40, dst_reg)); 418e430f34eSAlexei Starovoitov EMIT2(0xF7, add_1reg(0xD8, dst_reg)); 41962258278SAlexei Starovoitov break; 42062258278SAlexei Starovoitov 42162258278SAlexei Starovoitov case BPF_ALU | BPF_ADD | BPF_K: 42262258278SAlexei Starovoitov case BPF_ALU | BPF_SUB | BPF_K: 42362258278SAlexei Starovoitov case BPF_ALU | BPF_AND | BPF_K: 42462258278SAlexei Starovoitov case BPF_ALU | BPF_OR | BPF_K: 42562258278SAlexei Starovoitov case BPF_ALU | BPF_XOR | BPF_K: 42662258278SAlexei Starovoitov case BPF_ALU64 | BPF_ADD | BPF_K: 42762258278SAlexei Starovoitov case BPF_ALU64 | BPF_SUB | BPF_K: 42862258278SAlexei Starovoitov case BPF_ALU64 | BPF_AND | BPF_K: 42962258278SAlexei Starovoitov case BPF_ALU64 | BPF_OR | BPF_K: 43062258278SAlexei Starovoitov case BPF_ALU64 | BPF_XOR | BPF_K: 43162258278SAlexei Starovoitov if (BPF_CLASS(insn->code) == BPF_ALU64) 432e430f34eSAlexei Starovoitov EMIT1(add_1mod(0x48, dst_reg)); 433e430f34eSAlexei Starovoitov else if (is_ereg(dst_reg)) 434e430f34eSAlexei Starovoitov EMIT1(add_1mod(0x40, dst_reg)); 43562258278SAlexei Starovoitov 43662258278SAlexei Starovoitov switch (BPF_OP(insn->code)) { 43762258278SAlexei Starovoitov case BPF_ADD: b3 = 0xC0; break; 43862258278SAlexei Starovoitov case BPF_SUB: b3 = 0xE8; break; 43962258278SAlexei Starovoitov case BPF_AND: b3 = 0xE0; break; 44062258278SAlexei Starovoitov case BPF_OR: b3 = 0xC8; break; 44162258278SAlexei Starovoitov case BPF_XOR: b3 = 0xF0; break; 44262258278SAlexei Starovoitov } 44362258278SAlexei Starovoitov 444e430f34eSAlexei Starovoitov if (is_imm8(imm32)) 445e430f34eSAlexei Starovoitov EMIT3(0x83, add_1reg(b3, dst_reg), imm32); 44662258278SAlexei Starovoitov else 447e430f34eSAlexei Starovoitov EMIT2_off32(0x81, add_1reg(b3, dst_reg), imm32); 44862258278SAlexei Starovoitov break; 44962258278SAlexei Starovoitov 45062258278SAlexei Starovoitov case BPF_ALU64 | BPF_MOV | BPF_K: 45162258278SAlexei Starovoitov /* optimization: if imm32 is positive, 45262258278SAlexei Starovoitov * use 'mov eax, imm32' (which zero-extends imm32) 45362258278SAlexei Starovoitov * to save 2 bytes 454d00a9dd2SEric Dumazet */ 455e430f34eSAlexei Starovoitov if (imm32 < 0) { 45662258278SAlexei Starovoitov /* 'mov rax, imm32' sign extends imm32 */ 457e430f34eSAlexei Starovoitov b1 = add_1mod(0x48, dst_reg); 45862258278SAlexei Starovoitov b2 = 0xC7; 45962258278SAlexei Starovoitov b3 = 0xC0; 460e430f34eSAlexei Starovoitov EMIT3_off32(b1, b2, add_1reg(b3, dst_reg), imm32); 461aee636c4SEric Dumazet break; 462aee636c4SEric Dumazet } 4633b58908aSEric Dumazet 46462258278SAlexei Starovoitov case BPF_ALU | BPF_MOV | BPF_K: 46562258278SAlexei Starovoitov /* mov %eax, imm32 */ 466e430f34eSAlexei Starovoitov if (is_ereg(dst_reg)) 467e430f34eSAlexei Starovoitov EMIT1(add_1mod(0x40, dst_reg)); 468e430f34eSAlexei Starovoitov EMIT1_off32(add_1reg(0xB8, dst_reg), imm32); 46962258278SAlexei Starovoitov break; 47062258278SAlexei Starovoitov 47102ab695bSAlexei Starovoitov case BPF_LD | BPF_IMM | BPF_DW: 47202ab695bSAlexei Starovoitov if (insn[1].code != 0 || insn[1].src_reg != 0 || 47302ab695bSAlexei Starovoitov insn[1].dst_reg != 0 || insn[1].off != 0) { 47402ab695bSAlexei Starovoitov /* verifier must catch invalid insns */ 47502ab695bSAlexei Starovoitov pr_err("invalid BPF_LD_IMM64 insn\n"); 47602ab695bSAlexei Starovoitov return -EINVAL; 47702ab695bSAlexei Starovoitov } 47802ab695bSAlexei Starovoitov 47902ab695bSAlexei Starovoitov /* movabsq %rax, imm64 */ 48002ab695bSAlexei Starovoitov EMIT2(add_1mod(0x48, dst_reg), add_1reg(0xB8, dst_reg)); 48102ab695bSAlexei Starovoitov EMIT(insn[0].imm, 4); 48202ab695bSAlexei Starovoitov EMIT(insn[1].imm, 4); 48302ab695bSAlexei Starovoitov 48402ab695bSAlexei Starovoitov insn++; 48502ab695bSAlexei Starovoitov i++; 48602ab695bSAlexei Starovoitov break; 48702ab695bSAlexei Starovoitov 488e430f34eSAlexei Starovoitov /* dst %= src, dst /= src, dst %= imm32, dst /= imm32 */ 48962258278SAlexei Starovoitov case BPF_ALU | BPF_MOD | BPF_X: 49062258278SAlexei Starovoitov case BPF_ALU | BPF_DIV | BPF_X: 49162258278SAlexei Starovoitov case BPF_ALU | BPF_MOD | BPF_K: 49262258278SAlexei Starovoitov case BPF_ALU | BPF_DIV | BPF_K: 49362258278SAlexei Starovoitov case BPF_ALU64 | BPF_MOD | BPF_X: 49462258278SAlexei Starovoitov case BPF_ALU64 | BPF_DIV | BPF_X: 49562258278SAlexei Starovoitov case BPF_ALU64 | BPF_MOD | BPF_K: 49662258278SAlexei Starovoitov case BPF_ALU64 | BPF_DIV | BPF_K: 49762258278SAlexei Starovoitov EMIT1(0x50); /* push rax */ 49862258278SAlexei Starovoitov EMIT1(0x52); /* push rdx */ 49962258278SAlexei Starovoitov 50062258278SAlexei Starovoitov if (BPF_SRC(insn->code) == BPF_X) 501e430f34eSAlexei Starovoitov /* mov r11, src_reg */ 502e430f34eSAlexei Starovoitov EMIT_mov(AUX_REG, src_reg); 50362258278SAlexei Starovoitov else 504e430f34eSAlexei Starovoitov /* mov r11, imm32 */ 505e430f34eSAlexei Starovoitov EMIT3_off32(0x49, 0xC7, 0xC3, imm32); 50662258278SAlexei Starovoitov 507e430f34eSAlexei Starovoitov /* mov rax, dst_reg */ 508e430f34eSAlexei Starovoitov EMIT_mov(BPF_REG_0, dst_reg); 50962258278SAlexei Starovoitov 51062258278SAlexei Starovoitov /* xor edx, edx 51162258278SAlexei Starovoitov * equivalent to 'xor rdx, rdx', but one byte less 51262258278SAlexei Starovoitov */ 51362258278SAlexei Starovoitov EMIT2(0x31, 0xd2); 51462258278SAlexei Starovoitov 51562258278SAlexei Starovoitov if (BPF_SRC(insn->code) == BPF_X) { 516e430f34eSAlexei Starovoitov /* if (src_reg == 0) return 0 */ 51762258278SAlexei Starovoitov 51862258278SAlexei Starovoitov /* cmp r11, 0 */ 51962258278SAlexei Starovoitov EMIT4(0x49, 0x83, 0xFB, 0x00); 52062258278SAlexei Starovoitov 52162258278SAlexei Starovoitov /* jne .+9 (skip over pop, pop, xor and jmp) */ 52262258278SAlexei Starovoitov EMIT2(X86_JNE, 1 + 1 + 2 + 5); 52362258278SAlexei Starovoitov EMIT1(0x5A); /* pop rdx */ 52462258278SAlexei Starovoitov EMIT1(0x58); /* pop rax */ 52562258278SAlexei Starovoitov EMIT2(0x31, 0xc0); /* xor eax, eax */ 52662258278SAlexei Starovoitov 52762258278SAlexei Starovoitov /* jmp cleanup_addr 52862258278SAlexei Starovoitov * addrs[i] - 11, because there are 11 bytes 52962258278SAlexei Starovoitov * after this insn: div, mov, pop, pop, mov 53062258278SAlexei Starovoitov */ 53162258278SAlexei Starovoitov jmp_offset = ctx->cleanup_addr - (addrs[i] - 11); 53262258278SAlexei Starovoitov EMIT1_off32(0xE9, jmp_offset); 53362258278SAlexei Starovoitov } 53462258278SAlexei Starovoitov 53562258278SAlexei Starovoitov if (BPF_CLASS(insn->code) == BPF_ALU64) 53662258278SAlexei Starovoitov /* div r11 */ 53762258278SAlexei Starovoitov EMIT3(0x49, 0xF7, 0xF3); 53862258278SAlexei Starovoitov else 53962258278SAlexei Starovoitov /* div r11d */ 54062258278SAlexei Starovoitov EMIT3(0x41, 0xF7, 0xF3); 54162258278SAlexei Starovoitov 54262258278SAlexei Starovoitov if (BPF_OP(insn->code) == BPF_MOD) 54362258278SAlexei Starovoitov /* mov r11, rdx */ 54462258278SAlexei Starovoitov EMIT3(0x49, 0x89, 0xD3); 54562258278SAlexei Starovoitov else 54662258278SAlexei Starovoitov /* mov r11, rax */ 54762258278SAlexei Starovoitov EMIT3(0x49, 0x89, 0xC3); 54862258278SAlexei Starovoitov 54962258278SAlexei Starovoitov EMIT1(0x5A); /* pop rdx */ 55062258278SAlexei Starovoitov EMIT1(0x58); /* pop rax */ 55162258278SAlexei Starovoitov 552e430f34eSAlexei Starovoitov /* mov dst_reg, r11 */ 553e430f34eSAlexei Starovoitov EMIT_mov(dst_reg, AUX_REG); 55462258278SAlexei Starovoitov break; 55562258278SAlexei Starovoitov 55662258278SAlexei Starovoitov case BPF_ALU | BPF_MUL | BPF_K: 55762258278SAlexei Starovoitov case BPF_ALU | BPF_MUL | BPF_X: 55862258278SAlexei Starovoitov case BPF_ALU64 | BPF_MUL | BPF_K: 55962258278SAlexei Starovoitov case BPF_ALU64 | BPF_MUL | BPF_X: 56062258278SAlexei Starovoitov EMIT1(0x50); /* push rax */ 56162258278SAlexei Starovoitov EMIT1(0x52); /* push rdx */ 56262258278SAlexei Starovoitov 563e430f34eSAlexei Starovoitov /* mov r11, dst_reg */ 564e430f34eSAlexei Starovoitov EMIT_mov(AUX_REG, dst_reg); 56562258278SAlexei Starovoitov 56662258278SAlexei Starovoitov if (BPF_SRC(insn->code) == BPF_X) 567e430f34eSAlexei Starovoitov /* mov rax, src_reg */ 568e430f34eSAlexei Starovoitov EMIT_mov(BPF_REG_0, src_reg); 56962258278SAlexei Starovoitov else 570e430f34eSAlexei Starovoitov /* mov rax, imm32 */ 571e430f34eSAlexei Starovoitov EMIT3_off32(0x48, 0xC7, 0xC0, imm32); 57262258278SAlexei Starovoitov 57362258278SAlexei Starovoitov if (BPF_CLASS(insn->code) == BPF_ALU64) 57462258278SAlexei Starovoitov EMIT1(add_1mod(0x48, AUX_REG)); 57562258278SAlexei Starovoitov else if (is_ereg(AUX_REG)) 57662258278SAlexei Starovoitov EMIT1(add_1mod(0x40, AUX_REG)); 57762258278SAlexei Starovoitov /* mul(q) r11 */ 57862258278SAlexei Starovoitov EMIT2(0xF7, add_1reg(0xE0, AUX_REG)); 57962258278SAlexei Starovoitov 58062258278SAlexei Starovoitov /* mov r11, rax */ 58162258278SAlexei Starovoitov EMIT_mov(AUX_REG, BPF_REG_0); 58262258278SAlexei Starovoitov 58362258278SAlexei Starovoitov EMIT1(0x5A); /* pop rdx */ 58462258278SAlexei Starovoitov EMIT1(0x58); /* pop rax */ 58562258278SAlexei Starovoitov 586e430f34eSAlexei Starovoitov /* mov dst_reg, r11 */ 587e430f34eSAlexei Starovoitov EMIT_mov(dst_reg, AUX_REG); 58862258278SAlexei Starovoitov break; 58962258278SAlexei Starovoitov 59062258278SAlexei Starovoitov /* shifts */ 59162258278SAlexei Starovoitov case BPF_ALU | BPF_LSH | BPF_K: 59262258278SAlexei Starovoitov case BPF_ALU | BPF_RSH | BPF_K: 59362258278SAlexei Starovoitov case BPF_ALU | BPF_ARSH | BPF_K: 59462258278SAlexei Starovoitov case BPF_ALU64 | BPF_LSH | BPF_K: 59562258278SAlexei Starovoitov case BPF_ALU64 | BPF_RSH | BPF_K: 59662258278SAlexei Starovoitov case BPF_ALU64 | BPF_ARSH | BPF_K: 59762258278SAlexei Starovoitov if (BPF_CLASS(insn->code) == BPF_ALU64) 598e430f34eSAlexei Starovoitov EMIT1(add_1mod(0x48, dst_reg)); 599e430f34eSAlexei Starovoitov else if (is_ereg(dst_reg)) 600e430f34eSAlexei Starovoitov EMIT1(add_1mod(0x40, dst_reg)); 60162258278SAlexei Starovoitov 60262258278SAlexei Starovoitov switch (BPF_OP(insn->code)) { 60362258278SAlexei Starovoitov case BPF_LSH: b3 = 0xE0; break; 60462258278SAlexei Starovoitov case BPF_RSH: b3 = 0xE8; break; 60562258278SAlexei Starovoitov case BPF_ARSH: b3 = 0xF8; break; 60662258278SAlexei Starovoitov } 607e430f34eSAlexei Starovoitov EMIT3(0xC1, add_1reg(b3, dst_reg), imm32); 60862258278SAlexei Starovoitov break; 60962258278SAlexei Starovoitov 61072b603eeSAlexei Starovoitov case BPF_ALU | BPF_LSH | BPF_X: 61172b603eeSAlexei Starovoitov case BPF_ALU | BPF_RSH | BPF_X: 61272b603eeSAlexei Starovoitov case BPF_ALU | BPF_ARSH | BPF_X: 61372b603eeSAlexei Starovoitov case BPF_ALU64 | BPF_LSH | BPF_X: 61472b603eeSAlexei Starovoitov case BPF_ALU64 | BPF_RSH | BPF_X: 61572b603eeSAlexei Starovoitov case BPF_ALU64 | BPF_ARSH | BPF_X: 61672b603eeSAlexei Starovoitov 61772b603eeSAlexei Starovoitov /* check for bad case when dst_reg == rcx */ 61872b603eeSAlexei Starovoitov if (dst_reg == BPF_REG_4) { 61972b603eeSAlexei Starovoitov /* mov r11, dst_reg */ 62072b603eeSAlexei Starovoitov EMIT_mov(AUX_REG, dst_reg); 62172b603eeSAlexei Starovoitov dst_reg = AUX_REG; 62272b603eeSAlexei Starovoitov } 62372b603eeSAlexei Starovoitov 62472b603eeSAlexei Starovoitov if (src_reg != BPF_REG_4) { /* common case */ 62572b603eeSAlexei Starovoitov EMIT1(0x51); /* push rcx */ 62672b603eeSAlexei Starovoitov 62772b603eeSAlexei Starovoitov /* mov rcx, src_reg */ 62872b603eeSAlexei Starovoitov EMIT_mov(BPF_REG_4, src_reg); 62972b603eeSAlexei Starovoitov } 63072b603eeSAlexei Starovoitov 63172b603eeSAlexei Starovoitov /* shl %rax, %cl | shr %rax, %cl | sar %rax, %cl */ 63272b603eeSAlexei Starovoitov if (BPF_CLASS(insn->code) == BPF_ALU64) 63372b603eeSAlexei Starovoitov EMIT1(add_1mod(0x48, dst_reg)); 63472b603eeSAlexei Starovoitov else if (is_ereg(dst_reg)) 63572b603eeSAlexei Starovoitov EMIT1(add_1mod(0x40, dst_reg)); 63672b603eeSAlexei Starovoitov 63772b603eeSAlexei Starovoitov switch (BPF_OP(insn->code)) { 63872b603eeSAlexei Starovoitov case BPF_LSH: b3 = 0xE0; break; 63972b603eeSAlexei Starovoitov case BPF_RSH: b3 = 0xE8; break; 64072b603eeSAlexei Starovoitov case BPF_ARSH: b3 = 0xF8; break; 64172b603eeSAlexei Starovoitov } 64272b603eeSAlexei Starovoitov EMIT2(0xD3, add_1reg(b3, dst_reg)); 64372b603eeSAlexei Starovoitov 64472b603eeSAlexei Starovoitov if (src_reg != BPF_REG_4) 64572b603eeSAlexei Starovoitov EMIT1(0x59); /* pop rcx */ 64672b603eeSAlexei Starovoitov 64772b603eeSAlexei Starovoitov if (insn->dst_reg == BPF_REG_4) 64872b603eeSAlexei Starovoitov /* mov dst_reg, r11 */ 64972b603eeSAlexei Starovoitov EMIT_mov(insn->dst_reg, AUX_REG); 65072b603eeSAlexei Starovoitov break; 65172b603eeSAlexei Starovoitov 65262258278SAlexei Starovoitov case BPF_ALU | BPF_END | BPF_FROM_BE: 653e430f34eSAlexei Starovoitov switch (imm32) { 65462258278SAlexei Starovoitov case 16: 65562258278SAlexei Starovoitov /* emit 'ror %ax, 8' to swap lower 2 bytes */ 65662258278SAlexei Starovoitov EMIT1(0x66); 657e430f34eSAlexei Starovoitov if (is_ereg(dst_reg)) 65862258278SAlexei Starovoitov EMIT1(0x41); 659e430f34eSAlexei Starovoitov EMIT3(0xC1, add_1reg(0xC8, dst_reg), 8); 660343f845bSAlexei Starovoitov 661343f845bSAlexei Starovoitov /* emit 'movzwl eax, ax' */ 662343f845bSAlexei Starovoitov if (is_ereg(dst_reg)) 663343f845bSAlexei Starovoitov EMIT3(0x45, 0x0F, 0xB7); 664343f845bSAlexei Starovoitov else 665343f845bSAlexei Starovoitov EMIT2(0x0F, 0xB7); 666343f845bSAlexei Starovoitov EMIT1(add_2reg(0xC0, dst_reg, dst_reg)); 66762258278SAlexei Starovoitov break; 66862258278SAlexei Starovoitov case 32: 66962258278SAlexei Starovoitov /* emit 'bswap eax' to swap lower 4 bytes */ 670e430f34eSAlexei Starovoitov if (is_ereg(dst_reg)) 67162258278SAlexei Starovoitov EMIT2(0x41, 0x0F); 67262258278SAlexei Starovoitov else 67362258278SAlexei Starovoitov EMIT1(0x0F); 674e430f34eSAlexei Starovoitov EMIT1(add_1reg(0xC8, dst_reg)); 67562258278SAlexei Starovoitov break; 67662258278SAlexei Starovoitov case 64: 67762258278SAlexei Starovoitov /* emit 'bswap rax' to swap 8 bytes */ 678e430f34eSAlexei Starovoitov EMIT3(add_1mod(0x48, dst_reg), 0x0F, 679e430f34eSAlexei Starovoitov add_1reg(0xC8, dst_reg)); 68062258278SAlexei Starovoitov break; 68162258278SAlexei Starovoitov } 68262258278SAlexei Starovoitov break; 68362258278SAlexei Starovoitov 68462258278SAlexei Starovoitov case BPF_ALU | BPF_END | BPF_FROM_LE: 685343f845bSAlexei Starovoitov switch (imm32) { 686343f845bSAlexei Starovoitov case 16: 687343f845bSAlexei Starovoitov /* emit 'movzwl eax, ax' to zero extend 16-bit 688343f845bSAlexei Starovoitov * into 64 bit 689343f845bSAlexei Starovoitov */ 690343f845bSAlexei Starovoitov if (is_ereg(dst_reg)) 691343f845bSAlexei Starovoitov EMIT3(0x45, 0x0F, 0xB7); 692343f845bSAlexei Starovoitov else 693343f845bSAlexei Starovoitov EMIT2(0x0F, 0xB7); 694343f845bSAlexei Starovoitov EMIT1(add_2reg(0xC0, dst_reg, dst_reg)); 695343f845bSAlexei Starovoitov break; 696343f845bSAlexei Starovoitov case 32: 697343f845bSAlexei Starovoitov /* emit 'mov eax, eax' to clear upper 32-bits */ 698343f845bSAlexei Starovoitov if (is_ereg(dst_reg)) 699343f845bSAlexei Starovoitov EMIT1(0x45); 700343f845bSAlexei Starovoitov EMIT2(0x89, add_2reg(0xC0, dst_reg, dst_reg)); 701343f845bSAlexei Starovoitov break; 702343f845bSAlexei Starovoitov case 64: 703343f845bSAlexei Starovoitov /* nop */ 704343f845bSAlexei Starovoitov break; 705343f845bSAlexei Starovoitov } 70662258278SAlexei Starovoitov break; 70762258278SAlexei Starovoitov 708e430f34eSAlexei Starovoitov /* ST: *(u8*)(dst_reg + off) = imm */ 70962258278SAlexei Starovoitov case BPF_ST | BPF_MEM | BPF_B: 710e430f34eSAlexei Starovoitov if (is_ereg(dst_reg)) 71162258278SAlexei Starovoitov EMIT2(0x41, 0xC6); 71262258278SAlexei Starovoitov else 71362258278SAlexei Starovoitov EMIT1(0xC6); 71462258278SAlexei Starovoitov goto st; 71562258278SAlexei Starovoitov case BPF_ST | BPF_MEM | BPF_H: 716e430f34eSAlexei Starovoitov if (is_ereg(dst_reg)) 71762258278SAlexei Starovoitov EMIT3(0x66, 0x41, 0xC7); 71862258278SAlexei Starovoitov else 71962258278SAlexei Starovoitov EMIT2(0x66, 0xC7); 72062258278SAlexei Starovoitov goto st; 72162258278SAlexei Starovoitov case BPF_ST | BPF_MEM | BPF_W: 722e430f34eSAlexei Starovoitov if (is_ereg(dst_reg)) 72362258278SAlexei Starovoitov EMIT2(0x41, 0xC7); 72462258278SAlexei Starovoitov else 72562258278SAlexei Starovoitov EMIT1(0xC7); 72662258278SAlexei Starovoitov goto st; 72762258278SAlexei Starovoitov case BPF_ST | BPF_MEM | BPF_DW: 728e430f34eSAlexei Starovoitov EMIT2(add_1mod(0x48, dst_reg), 0xC7); 72962258278SAlexei Starovoitov 73062258278SAlexei Starovoitov st: if (is_imm8(insn->off)) 731e430f34eSAlexei Starovoitov EMIT2(add_1reg(0x40, dst_reg), insn->off); 73262258278SAlexei Starovoitov else 733e430f34eSAlexei Starovoitov EMIT1_off32(add_1reg(0x80, dst_reg), insn->off); 73462258278SAlexei Starovoitov 735e430f34eSAlexei Starovoitov EMIT(imm32, bpf_size_to_x86_bytes(BPF_SIZE(insn->code))); 73662258278SAlexei Starovoitov break; 73762258278SAlexei Starovoitov 738e430f34eSAlexei Starovoitov /* STX: *(u8*)(dst_reg + off) = src_reg */ 73962258278SAlexei Starovoitov case BPF_STX | BPF_MEM | BPF_B: 74062258278SAlexei Starovoitov /* emit 'mov byte ptr [rax + off], al' */ 741e430f34eSAlexei Starovoitov if (is_ereg(dst_reg) || is_ereg(src_reg) || 74262258278SAlexei Starovoitov /* have to add extra byte for x86 SIL, DIL regs */ 743e430f34eSAlexei Starovoitov src_reg == BPF_REG_1 || src_reg == BPF_REG_2) 744e430f34eSAlexei Starovoitov EMIT2(add_2mod(0x40, dst_reg, src_reg), 0x88); 74562258278SAlexei Starovoitov else 74662258278SAlexei Starovoitov EMIT1(0x88); 74762258278SAlexei Starovoitov goto stx; 74862258278SAlexei Starovoitov case BPF_STX | BPF_MEM | BPF_H: 749e430f34eSAlexei Starovoitov if (is_ereg(dst_reg) || is_ereg(src_reg)) 750e430f34eSAlexei Starovoitov EMIT3(0x66, add_2mod(0x40, dst_reg, src_reg), 0x89); 75162258278SAlexei Starovoitov else 75262258278SAlexei Starovoitov EMIT2(0x66, 0x89); 75362258278SAlexei Starovoitov goto stx; 75462258278SAlexei Starovoitov case BPF_STX | BPF_MEM | BPF_W: 755e430f34eSAlexei Starovoitov if (is_ereg(dst_reg) || is_ereg(src_reg)) 756e430f34eSAlexei Starovoitov EMIT2(add_2mod(0x40, dst_reg, src_reg), 0x89); 75762258278SAlexei Starovoitov else 75862258278SAlexei Starovoitov EMIT1(0x89); 75962258278SAlexei Starovoitov goto stx; 76062258278SAlexei Starovoitov case BPF_STX | BPF_MEM | BPF_DW: 761e430f34eSAlexei Starovoitov EMIT2(add_2mod(0x48, dst_reg, src_reg), 0x89); 76262258278SAlexei Starovoitov stx: if (is_imm8(insn->off)) 763e430f34eSAlexei Starovoitov EMIT2(add_2reg(0x40, dst_reg, src_reg), insn->off); 76462258278SAlexei Starovoitov else 765e430f34eSAlexei Starovoitov EMIT1_off32(add_2reg(0x80, dst_reg, src_reg), 76662258278SAlexei Starovoitov insn->off); 76762258278SAlexei Starovoitov break; 76862258278SAlexei Starovoitov 769e430f34eSAlexei Starovoitov /* LDX: dst_reg = *(u8*)(src_reg + off) */ 77062258278SAlexei Starovoitov case BPF_LDX | BPF_MEM | BPF_B: 77162258278SAlexei Starovoitov /* emit 'movzx rax, byte ptr [rax + off]' */ 772e430f34eSAlexei Starovoitov EMIT3(add_2mod(0x48, src_reg, dst_reg), 0x0F, 0xB6); 77362258278SAlexei Starovoitov goto ldx; 77462258278SAlexei Starovoitov case BPF_LDX | BPF_MEM | BPF_H: 77562258278SAlexei Starovoitov /* emit 'movzx rax, word ptr [rax + off]' */ 776e430f34eSAlexei Starovoitov EMIT3(add_2mod(0x48, src_reg, dst_reg), 0x0F, 0xB7); 77762258278SAlexei Starovoitov goto ldx; 77862258278SAlexei Starovoitov case BPF_LDX | BPF_MEM | BPF_W: 77962258278SAlexei Starovoitov /* emit 'mov eax, dword ptr [rax+0x14]' */ 780e430f34eSAlexei Starovoitov if (is_ereg(dst_reg) || is_ereg(src_reg)) 781e430f34eSAlexei Starovoitov EMIT2(add_2mod(0x40, src_reg, dst_reg), 0x8B); 78262258278SAlexei Starovoitov else 78362258278SAlexei Starovoitov EMIT1(0x8B); 78462258278SAlexei Starovoitov goto ldx; 78562258278SAlexei Starovoitov case BPF_LDX | BPF_MEM | BPF_DW: 78662258278SAlexei Starovoitov /* emit 'mov rax, qword ptr [rax+0x14]' */ 787e430f34eSAlexei Starovoitov EMIT2(add_2mod(0x48, src_reg, dst_reg), 0x8B); 78862258278SAlexei Starovoitov ldx: /* if insn->off == 0 we can save one extra byte, but 78962258278SAlexei Starovoitov * special case of x86 r13 which always needs an offset 79062258278SAlexei Starovoitov * is not worth the hassle 79162258278SAlexei Starovoitov */ 79262258278SAlexei Starovoitov if (is_imm8(insn->off)) 793e430f34eSAlexei Starovoitov EMIT2(add_2reg(0x40, src_reg, dst_reg), insn->off); 79462258278SAlexei Starovoitov else 795e430f34eSAlexei Starovoitov EMIT1_off32(add_2reg(0x80, src_reg, dst_reg), 79662258278SAlexei Starovoitov insn->off); 79762258278SAlexei Starovoitov break; 79862258278SAlexei Starovoitov 799e430f34eSAlexei Starovoitov /* STX XADD: lock *(u32*)(dst_reg + off) += src_reg */ 80062258278SAlexei Starovoitov case BPF_STX | BPF_XADD | BPF_W: 80162258278SAlexei Starovoitov /* emit 'lock add dword ptr [rax + off], eax' */ 802e430f34eSAlexei Starovoitov if (is_ereg(dst_reg) || is_ereg(src_reg)) 803e430f34eSAlexei Starovoitov EMIT3(0xF0, add_2mod(0x40, dst_reg, src_reg), 0x01); 80462258278SAlexei Starovoitov else 80562258278SAlexei Starovoitov EMIT2(0xF0, 0x01); 80662258278SAlexei Starovoitov goto xadd; 80762258278SAlexei Starovoitov case BPF_STX | BPF_XADD | BPF_DW: 808e430f34eSAlexei Starovoitov EMIT3(0xF0, add_2mod(0x48, dst_reg, src_reg), 0x01); 80962258278SAlexei Starovoitov xadd: if (is_imm8(insn->off)) 810e430f34eSAlexei Starovoitov EMIT2(add_2reg(0x40, dst_reg, src_reg), insn->off); 81162258278SAlexei Starovoitov else 812e430f34eSAlexei Starovoitov EMIT1_off32(add_2reg(0x80, dst_reg, src_reg), 81362258278SAlexei Starovoitov insn->off); 81462258278SAlexei Starovoitov break; 81562258278SAlexei Starovoitov 81662258278SAlexei Starovoitov /* call */ 81762258278SAlexei Starovoitov case BPF_JMP | BPF_CALL: 818e430f34eSAlexei Starovoitov func = (u8 *) __bpf_call_base + imm32; 81962258278SAlexei Starovoitov jmp_offset = func - (image + addrs[i]); 820e0ee9c12SAlexei Starovoitov if (seen_ld_abs) { 82162258278SAlexei Starovoitov EMIT2(0x41, 0x52); /* push %r10 */ 82262258278SAlexei Starovoitov EMIT2(0x41, 0x51); /* push %r9 */ 82362258278SAlexei Starovoitov /* need to adjust jmp offset, since 82462258278SAlexei Starovoitov * pop %r9, pop %r10 take 4 bytes after call insn 82562258278SAlexei Starovoitov */ 82662258278SAlexei Starovoitov jmp_offset += 4; 82762258278SAlexei Starovoitov } 828e430f34eSAlexei Starovoitov if (!imm32 || !is_simm32(jmp_offset)) { 82962258278SAlexei Starovoitov pr_err("unsupported bpf func %d addr %p image %p\n", 830e430f34eSAlexei Starovoitov imm32, func, image); 831f3c2af7bSAlexei Starovoitov return -EINVAL; 83262258278SAlexei Starovoitov } 83362258278SAlexei Starovoitov EMIT1_off32(0xE8, jmp_offset); 834e0ee9c12SAlexei Starovoitov if (seen_ld_abs) { 83562258278SAlexei Starovoitov EMIT2(0x41, 0x59); /* pop %r9 */ 83662258278SAlexei Starovoitov EMIT2(0x41, 0x5A); /* pop %r10 */ 83762258278SAlexei Starovoitov } 83862258278SAlexei Starovoitov break; 83962258278SAlexei Starovoitov 840b52f00e6SAlexei Starovoitov case BPF_JMP | BPF_CALL | BPF_X: 841b52f00e6SAlexei Starovoitov emit_bpf_tail_call(&prog); 842b52f00e6SAlexei Starovoitov break; 843b52f00e6SAlexei Starovoitov 84462258278SAlexei Starovoitov /* cond jump */ 84562258278SAlexei Starovoitov case BPF_JMP | BPF_JEQ | BPF_X: 84662258278SAlexei Starovoitov case BPF_JMP | BPF_JNE | BPF_X: 84762258278SAlexei Starovoitov case BPF_JMP | BPF_JGT | BPF_X: 84862258278SAlexei Starovoitov case BPF_JMP | BPF_JGE | BPF_X: 84962258278SAlexei Starovoitov case BPF_JMP | BPF_JSGT | BPF_X: 85062258278SAlexei Starovoitov case BPF_JMP | BPF_JSGE | BPF_X: 851e430f34eSAlexei Starovoitov /* cmp dst_reg, src_reg */ 852e430f34eSAlexei Starovoitov EMIT3(add_2mod(0x48, dst_reg, src_reg), 0x39, 853e430f34eSAlexei Starovoitov add_2reg(0xC0, dst_reg, src_reg)); 85462258278SAlexei Starovoitov goto emit_cond_jmp; 85562258278SAlexei Starovoitov 85662258278SAlexei Starovoitov case BPF_JMP | BPF_JSET | BPF_X: 857e430f34eSAlexei Starovoitov /* test dst_reg, src_reg */ 858e430f34eSAlexei Starovoitov EMIT3(add_2mod(0x48, dst_reg, src_reg), 0x85, 859e430f34eSAlexei Starovoitov add_2reg(0xC0, dst_reg, src_reg)); 86062258278SAlexei Starovoitov goto emit_cond_jmp; 86162258278SAlexei Starovoitov 86262258278SAlexei Starovoitov case BPF_JMP | BPF_JSET | BPF_K: 863e430f34eSAlexei Starovoitov /* test dst_reg, imm32 */ 864e430f34eSAlexei Starovoitov EMIT1(add_1mod(0x48, dst_reg)); 865e430f34eSAlexei Starovoitov EMIT2_off32(0xF7, add_1reg(0xC0, dst_reg), imm32); 86662258278SAlexei Starovoitov goto emit_cond_jmp; 86762258278SAlexei Starovoitov 86862258278SAlexei Starovoitov case BPF_JMP | BPF_JEQ | BPF_K: 86962258278SAlexei Starovoitov case BPF_JMP | BPF_JNE | BPF_K: 87062258278SAlexei Starovoitov case BPF_JMP | BPF_JGT | BPF_K: 87162258278SAlexei Starovoitov case BPF_JMP | BPF_JGE | BPF_K: 87262258278SAlexei Starovoitov case BPF_JMP | BPF_JSGT | BPF_K: 87362258278SAlexei Starovoitov case BPF_JMP | BPF_JSGE | BPF_K: 874e430f34eSAlexei Starovoitov /* cmp dst_reg, imm8/32 */ 875e430f34eSAlexei Starovoitov EMIT1(add_1mod(0x48, dst_reg)); 87662258278SAlexei Starovoitov 877e430f34eSAlexei Starovoitov if (is_imm8(imm32)) 878e430f34eSAlexei Starovoitov EMIT3(0x83, add_1reg(0xF8, dst_reg), imm32); 87962258278SAlexei Starovoitov else 880e430f34eSAlexei Starovoitov EMIT2_off32(0x81, add_1reg(0xF8, dst_reg), imm32); 88162258278SAlexei Starovoitov 88262258278SAlexei Starovoitov emit_cond_jmp: /* convert BPF opcode to x86 */ 88362258278SAlexei Starovoitov switch (BPF_OP(insn->code)) { 88462258278SAlexei Starovoitov case BPF_JEQ: 88562258278SAlexei Starovoitov jmp_cond = X86_JE; 88662258278SAlexei Starovoitov break; 88762258278SAlexei Starovoitov case BPF_JSET: 88862258278SAlexei Starovoitov case BPF_JNE: 88962258278SAlexei Starovoitov jmp_cond = X86_JNE; 89062258278SAlexei Starovoitov break; 89162258278SAlexei Starovoitov case BPF_JGT: 89262258278SAlexei Starovoitov /* GT is unsigned '>', JA in x86 */ 89362258278SAlexei Starovoitov jmp_cond = X86_JA; 89462258278SAlexei Starovoitov break; 89562258278SAlexei Starovoitov case BPF_JGE: 89662258278SAlexei Starovoitov /* GE is unsigned '>=', JAE in x86 */ 89762258278SAlexei Starovoitov jmp_cond = X86_JAE; 89862258278SAlexei Starovoitov break; 89962258278SAlexei Starovoitov case BPF_JSGT: 90062258278SAlexei Starovoitov /* signed '>', GT in x86 */ 90162258278SAlexei Starovoitov jmp_cond = X86_JG; 90262258278SAlexei Starovoitov break; 90362258278SAlexei Starovoitov case BPF_JSGE: 90462258278SAlexei Starovoitov /* signed '>=', GE in x86 */ 90562258278SAlexei Starovoitov jmp_cond = X86_JGE; 90662258278SAlexei Starovoitov break; 90762258278SAlexei Starovoitov default: /* to silence gcc warning */ 90862258278SAlexei Starovoitov return -EFAULT; 90962258278SAlexei Starovoitov } 91062258278SAlexei Starovoitov jmp_offset = addrs[i + insn->off] - addrs[i]; 91162258278SAlexei Starovoitov if (is_imm8(jmp_offset)) { 91262258278SAlexei Starovoitov EMIT2(jmp_cond, jmp_offset); 91362258278SAlexei Starovoitov } else if (is_simm32(jmp_offset)) { 91462258278SAlexei Starovoitov EMIT2_off32(0x0F, jmp_cond + 0x10, jmp_offset); 9153b58908aSEric Dumazet } else { 91662258278SAlexei Starovoitov pr_err("cond_jmp gen bug %llx\n", jmp_offset); 91762258278SAlexei Starovoitov return -EFAULT; 9183b58908aSEric Dumazet } 91962258278SAlexei Starovoitov 9203b58908aSEric Dumazet break; 92162258278SAlexei Starovoitov 92262258278SAlexei Starovoitov case BPF_JMP | BPF_JA: 92362258278SAlexei Starovoitov jmp_offset = addrs[i + insn->off] - addrs[i]; 92462258278SAlexei Starovoitov if (!jmp_offset) 92562258278SAlexei Starovoitov /* optimize out nop jumps */ 92662258278SAlexei Starovoitov break; 92762258278SAlexei Starovoitov emit_jmp: 92862258278SAlexei Starovoitov if (is_imm8(jmp_offset)) { 92962258278SAlexei Starovoitov EMIT2(0xEB, jmp_offset); 93062258278SAlexei Starovoitov } else if (is_simm32(jmp_offset)) { 93162258278SAlexei Starovoitov EMIT1_off32(0xE9, jmp_offset); 93262258278SAlexei Starovoitov } else { 93362258278SAlexei Starovoitov pr_err("jmp gen bug %llx\n", jmp_offset); 93462258278SAlexei Starovoitov return -EFAULT; 9353b58908aSEric Dumazet } 93662258278SAlexei Starovoitov break; 93762258278SAlexei Starovoitov 93862258278SAlexei Starovoitov case BPF_LD | BPF_IND | BPF_W: 93962258278SAlexei Starovoitov func = sk_load_word; 94062258278SAlexei Starovoitov goto common_load; 94162258278SAlexei Starovoitov case BPF_LD | BPF_ABS | BPF_W: 942e430f34eSAlexei Starovoitov func = CHOOSE_LOAD_FUNC(imm32, sk_load_word); 943e0ee9c12SAlexei Starovoitov common_load: 944e0ee9c12SAlexei Starovoitov ctx->seen_ld_abs = seen_ld_abs = true; 94562258278SAlexei Starovoitov jmp_offset = func - (image + addrs[i]); 94662258278SAlexei Starovoitov if (!func || !is_simm32(jmp_offset)) { 94762258278SAlexei Starovoitov pr_err("unsupported bpf func %d addr %p image %p\n", 948e430f34eSAlexei Starovoitov imm32, func, image); 94962258278SAlexei Starovoitov return -EINVAL; 95062258278SAlexei Starovoitov } 95162258278SAlexei Starovoitov if (BPF_MODE(insn->code) == BPF_ABS) { 95262258278SAlexei Starovoitov /* mov %esi, imm32 */ 953e430f34eSAlexei Starovoitov EMIT1_off32(0xBE, imm32); 95462258278SAlexei Starovoitov } else { 955e430f34eSAlexei Starovoitov /* mov %rsi, src_reg */ 956e430f34eSAlexei Starovoitov EMIT_mov(BPF_REG_2, src_reg); 957e430f34eSAlexei Starovoitov if (imm32) { 958e430f34eSAlexei Starovoitov if (is_imm8(imm32)) 95962258278SAlexei Starovoitov /* add %esi, imm8 */ 960e430f34eSAlexei Starovoitov EMIT3(0x83, 0xC6, imm32); 96162258278SAlexei Starovoitov else 96262258278SAlexei Starovoitov /* add %esi, imm32 */ 963e430f34eSAlexei Starovoitov EMIT2_off32(0x81, 0xC6, imm32); 96462258278SAlexei Starovoitov } 96562258278SAlexei Starovoitov } 96662258278SAlexei Starovoitov /* skb pointer is in R6 (%rbx), it will be copied into 96762258278SAlexei Starovoitov * %rdi if skb_copy_bits() call is necessary. 96862258278SAlexei Starovoitov * sk_load_* helpers also use %r10 and %r9d. 96962258278SAlexei Starovoitov * See bpf_jit.S 97062258278SAlexei Starovoitov */ 97162258278SAlexei Starovoitov EMIT1_off32(0xE8, jmp_offset); /* call */ 9720a14842fSEric Dumazet break; 97362258278SAlexei Starovoitov 97462258278SAlexei Starovoitov case BPF_LD | BPF_IND | BPF_H: 97562258278SAlexei Starovoitov func = sk_load_half; 97662258278SAlexei Starovoitov goto common_load; 97762258278SAlexei Starovoitov case BPF_LD | BPF_ABS | BPF_H: 978e430f34eSAlexei Starovoitov func = CHOOSE_LOAD_FUNC(imm32, sk_load_half); 9790a14842fSEric Dumazet goto common_load; 98062258278SAlexei Starovoitov case BPF_LD | BPF_IND | BPF_B: 98162258278SAlexei Starovoitov func = sk_load_byte; 98262258278SAlexei Starovoitov goto common_load; 98362258278SAlexei Starovoitov case BPF_LD | BPF_ABS | BPF_B: 984e430f34eSAlexei Starovoitov func = CHOOSE_LOAD_FUNC(imm32, sk_load_byte); 9850a14842fSEric Dumazet goto common_load; 9860a14842fSEric Dumazet 98762258278SAlexei Starovoitov case BPF_JMP | BPF_EXIT: 988769e0de6SAlexei Starovoitov if (seen_exit) { 98962258278SAlexei Starovoitov jmp_offset = ctx->cleanup_addr - addrs[i]; 99062258278SAlexei Starovoitov goto emit_jmp; 99162258278SAlexei Starovoitov } 992769e0de6SAlexei Starovoitov seen_exit = true; 99362258278SAlexei Starovoitov /* update cleanup_addr */ 99462258278SAlexei Starovoitov ctx->cleanup_addr = proglen; 99562258278SAlexei Starovoitov /* mov rbx, qword ptr [rbp-X] */ 996b52f00e6SAlexei Starovoitov EMIT3_off32(0x48, 0x8B, 0x9D, -STACKSIZE); 99762258278SAlexei Starovoitov /* mov r13, qword ptr [rbp-X] */ 998b52f00e6SAlexei Starovoitov EMIT3_off32(0x4C, 0x8B, 0xAD, -STACKSIZE + 8); 99962258278SAlexei Starovoitov /* mov r14, qword ptr [rbp-X] */ 1000b52f00e6SAlexei Starovoitov EMIT3_off32(0x4C, 0x8B, 0xB5, -STACKSIZE + 16); 100162258278SAlexei Starovoitov /* mov r15, qword ptr [rbp-X] */ 1002b52f00e6SAlexei Starovoitov EMIT3_off32(0x4C, 0x8B, 0xBD, -STACKSIZE + 24); 10030a14842fSEric Dumazet 100462258278SAlexei Starovoitov EMIT1(0xC9); /* leave */ 100562258278SAlexei Starovoitov EMIT1(0xC3); /* ret */ 10060a14842fSEric Dumazet break; 10070a14842fSEric Dumazet 10080a14842fSEric Dumazet default: 100962258278SAlexei Starovoitov /* By design x64 JIT should support all BPF instructions 101062258278SAlexei Starovoitov * This error will be seen if new instruction was added 101162258278SAlexei Starovoitov * to interpreter, but not to JIT 10127ae457c1SAlexei Starovoitov * or if there is junk in bpf_prog 101362258278SAlexei Starovoitov */ 101462258278SAlexei Starovoitov pr_err("bpf_jit: unknown opcode %02x\n", insn->code); 1015f3c2af7bSAlexei Starovoitov return -EINVAL; 10160a14842fSEric Dumazet } 101762258278SAlexei Starovoitov 10180a14842fSEric Dumazet ilen = prog - temp; 1019e0ee9c12SAlexei Starovoitov if (ilen > BPF_MAX_INSN_SIZE) { 1020e0ee9c12SAlexei Starovoitov pr_err("bpf_jit_compile fatal insn size error\n"); 1021e0ee9c12SAlexei Starovoitov return -EFAULT; 1022e0ee9c12SAlexei Starovoitov } 1023e0ee9c12SAlexei Starovoitov 10240a14842fSEric Dumazet if (image) { 10250a14842fSEric Dumazet if (unlikely(proglen + ilen > oldproglen)) { 102662258278SAlexei Starovoitov pr_err("bpf_jit_compile fatal error\n"); 1027f3c2af7bSAlexei Starovoitov return -EFAULT; 10280a14842fSEric Dumazet } 10290a14842fSEric Dumazet memcpy(image + proglen, temp, ilen); 10300a14842fSEric Dumazet } 10310a14842fSEric Dumazet proglen += ilen; 10320a14842fSEric Dumazet addrs[i] = proglen; 10330a14842fSEric Dumazet prog = temp; 10340a14842fSEric Dumazet } 1035f3c2af7bSAlexei Starovoitov return proglen; 1036f3c2af7bSAlexei Starovoitov } 1037f3c2af7bSAlexei Starovoitov 10387ae457c1SAlexei Starovoitov void bpf_jit_compile(struct bpf_prog *prog) 1039f3c2af7bSAlexei Starovoitov { 104062258278SAlexei Starovoitov } 104162258278SAlexei Starovoitov 10427ae457c1SAlexei Starovoitov void bpf_int_jit_compile(struct bpf_prog *prog) 104362258278SAlexei Starovoitov { 1044f3c2af7bSAlexei Starovoitov struct bpf_binary_header *header = NULL; 1045f3c2af7bSAlexei Starovoitov int proglen, oldproglen = 0; 1046f3c2af7bSAlexei Starovoitov struct jit_context ctx = {}; 1047f3c2af7bSAlexei Starovoitov u8 *image = NULL; 1048f3c2af7bSAlexei Starovoitov int *addrs; 1049f3c2af7bSAlexei Starovoitov int pass; 1050f3c2af7bSAlexei Starovoitov int i; 1051f3c2af7bSAlexei Starovoitov 1052f3c2af7bSAlexei Starovoitov if (!bpf_jit_enable) 1053f3c2af7bSAlexei Starovoitov return; 1054f3c2af7bSAlexei Starovoitov 1055f3c2af7bSAlexei Starovoitov if (!prog || !prog->len) 1056f3c2af7bSAlexei Starovoitov return; 1057f3c2af7bSAlexei Starovoitov 1058f3c2af7bSAlexei Starovoitov addrs = kmalloc(prog->len * sizeof(*addrs), GFP_KERNEL); 1059f3c2af7bSAlexei Starovoitov if (!addrs) 1060f3c2af7bSAlexei Starovoitov return; 1061f3c2af7bSAlexei Starovoitov 1062f3c2af7bSAlexei Starovoitov /* Before first pass, make a rough estimation of addrs[] 1063f3c2af7bSAlexei Starovoitov * each bpf instruction is translated to less than 64 bytes 1064f3c2af7bSAlexei Starovoitov */ 1065f3c2af7bSAlexei Starovoitov for (proglen = 0, i = 0; i < prog->len; i++) { 1066f3c2af7bSAlexei Starovoitov proglen += 64; 1067f3c2af7bSAlexei Starovoitov addrs[i] = proglen; 1068f3c2af7bSAlexei Starovoitov } 1069f3c2af7bSAlexei Starovoitov ctx.cleanup_addr = proglen; 1070f3c2af7bSAlexei Starovoitov 10713f7352bfSAlexei Starovoitov /* JITed image shrinks with every pass and the loop iterates 10723f7352bfSAlexei Starovoitov * until the image stops shrinking. Very large bpf programs 10733f7352bfSAlexei Starovoitov * may converge on the last pass. In such case do one more 10743f7352bfSAlexei Starovoitov * pass to emit the final image 10753f7352bfSAlexei Starovoitov */ 10763f7352bfSAlexei Starovoitov for (pass = 0; pass < 10 || image; pass++) { 1077f3c2af7bSAlexei Starovoitov proglen = do_jit(prog, addrs, image, oldproglen, &ctx); 1078f3c2af7bSAlexei Starovoitov if (proglen <= 0) { 1079f3c2af7bSAlexei Starovoitov image = NULL; 1080f3c2af7bSAlexei Starovoitov if (header) 1081738cbe72SDaniel Borkmann bpf_jit_binary_free(header); 1082f3c2af7bSAlexei Starovoitov goto out; 1083f3c2af7bSAlexei Starovoitov } 10840a14842fSEric Dumazet if (image) { 1085e0ee9c12SAlexei Starovoitov if (proglen != oldproglen) { 1086f3c2af7bSAlexei Starovoitov pr_err("bpf_jit: proglen=%d != oldproglen=%d\n", 1087f3c2af7bSAlexei Starovoitov proglen, oldproglen); 1088e0ee9c12SAlexei Starovoitov goto out; 1089e0ee9c12SAlexei Starovoitov } 10900a14842fSEric Dumazet break; 10910a14842fSEric Dumazet } 10920a14842fSEric Dumazet if (proglen == oldproglen) { 1093738cbe72SDaniel Borkmann header = bpf_jit_binary_alloc(proglen, &image, 1094738cbe72SDaniel Borkmann 1, jit_fill_hole); 1095314beb9bSEric Dumazet if (!header) 10960a14842fSEric Dumazet goto out; 10970a14842fSEric Dumazet } 10980a14842fSEric Dumazet oldproglen = proglen; 10990a14842fSEric Dumazet } 110079617801SDaniel Borkmann 11010a14842fSEric Dumazet if (bpf_jit_enable > 1) 1102f3c2af7bSAlexei Starovoitov bpf_jit_dump(prog->len, proglen, 0, image); 11030a14842fSEric Dumazet 11040a14842fSEric Dumazet if (image) { 1105314beb9bSEric Dumazet bpf_flush_icache(header, image + proglen); 1106314beb9bSEric Dumazet set_memory_ro((unsigned long)header, header->pages); 1107f3c2af7bSAlexei Starovoitov prog->bpf_func = (void *)image; 1108286aad3cSDaniel Borkmann prog->jited = true; 11090a14842fSEric Dumazet } 11100a14842fSEric Dumazet out: 11110a14842fSEric Dumazet kfree(addrs); 11120a14842fSEric Dumazet } 11130a14842fSEric Dumazet 111460a3b225SDaniel Borkmann void bpf_jit_free(struct bpf_prog *fp) 11150a14842fSEric Dumazet { 1116314beb9bSEric Dumazet unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK; 1117314beb9bSEric Dumazet struct bpf_binary_header *header = (void *)addr; 1118314beb9bSEric Dumazet 111960a3b225SDaniel Borkmann if (!fp->jited) 112060a3b225SDaniel Borkmann goto free_filter; 112160a3b225SDaniel Borkmann 1122314beb9bSEric Dumazet set_memory_rw(addr, header->pages); 1123738cbe72SDaniel Borkmann bpf_jit_binary_free(header); 1124d45ed4a4SAlexei Starovoitov 112560a3b225SDaniel Borkmann free_filter: 112660a3b225SDaniel Borkmann bpf_prog_unlock_free(fp); 11270a14842fSEric Dumazet } 1128