1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
3 * Copyright (c) 2016 Facebook
10 #define __BPF_FUNC_STR_FN(x) [BPF_FUNC_ ## x] = __stringify(bpf_ ## x)
11 static const char * const func_id_str[] = {
12 __BPF_FUNC_MAPPER(__BPF_FUNC_STR_FN)
14 #undef __BPF_FUNC_STR_FN
16 static const char *__func_get_name(const struct bpf_insn_cbs *cbs,
17 const struct bpf_insn *insn,
18 char *buff, size_t len)
20 BUILD_BUG_ON(ARRAY_SIZE(func_id_str) != __BPF_FUNC_MAX_ID);
22 if (insn->src_reg != BPF_PSEUDO_CALL &&
23 insn->imm >= 0 && insn->imm < __BPF_FUNC_MAX_ID &&
24 func_id_str[insn->imm])
25 return func_id_str[insn->imm];
27 if (cbs && cbs->cb_call)
28 return cbs->cb_call(cbs->private_data, insn);
30 if (insn->src_reg == BPF_PSEUDO_CALL)
31 snprintf(buff, len, "%+d", insn->imm);
36 static const char *__func_imm_name(const struct bpf_insn_cbs *cbs,
37 const struct bpf_insn *insn,
38 u64 full_imm, char *buff, size_t len)
40 if (cbs && cbs->cb_imm)
41 return cbs->cb_imm(cbs->private_data, insn, full_imm);
43 snprintf(buff, len, "0x%llx", (unsigned long long)full_imm);
47 const char *func_id_name(int id)
49 if (id >= 0 && id < __BPF_FUNC_MAX_ID && func_id_str[id])
50 return func_id_str[id];
55 const char *const bpf_class_string[8] = {
62 [BPF_JMP32] = "jmp32",
63 [BPF_ALU64] = "alu64",
66 const char *const bpf_alu_string[16] = {
67 [BPF_ADD >> 4] = "+=",
68 [BPF_SUB >> 4] = "-=",
69 [BPF_MUL >> 4] = "*=",
70 [BPF_DIV >> 4] = "/=",
72 [BPF_AND >> 4] = "&=",
73 [BPF_LSH >> 4] = "<<=",
74 [BPF_RSH >> 4] = ">>=",
75 [BPF_NEG >> 4] = "neg",
76 [BPF_MOD >> 4] = "%=",
77 [BPF_XOR >> 4] = "^=",
79 [BPF_ARSH >> 4] = "s>>=",
80 [BPF_END >> 4] = "endian",
83 static const char *const bpf_atomic_alu_string[16] = {
84 [BPF_ADD >> 4] = "add",
85 [BPF_AND >> 4] = "and",
87 [BPF_XOR >> 4] = "or",
90 static const char *const bpf_ldst_string[] = {
94 [BPF_DW >> 3] = "u64",
97 static const char *const bpf_jmp_string[16] = {
98 [BPF_JA >> 4] = "jmp",
99 [BPF_JEQ >> 4] = "==",
100 [BPF_JGT >> 4] = ">",
101 [BPF_JLT >> 4] = "<",
102 [BPF_JGE >> 4] = ">=",
103 [BPF_JLE >> 4] = "<=",
104 [BPF_JSET >> 4] = "&",
105 [BPF_JNE >> 4] = "!=",
106 [BPF_JSGT >> 4] = "s>",
107 [BPF_JSLT >> 4] = "s<",
108 [BPF_JSGE >> 4] = "s>=",
109 [BPF_JSLE >> 4] = "s<=",
110 [BPF_CALL >> 4] = "call",
111 [BPF_EXIT >> 4] = "exit",
114 static void print_bpf_end_insn(bpf_insn_print_t verbose,
116 const struct bpf_insn *insn)
118 verbose(private_data, "(%02x) r%d = %s%d r%d\n",
119 insn->code, insn->dst_reg,
120 BPF_SRC(insn->code) == BPF_TO_BE ? "be" : "le",
121 insn->imm, insn->dst_reg);
124 void print_bpf_insn(const struct bpf_insn_cbs *cbs,
125 const struct bpf_insn *insn,
126 bool allow_ptr_leaks)
128 const bpf_insn_print_t verbose = cbs->cb_print;
129 u8 class = BPF_CLASS(insn->code);
131 if (class == BPF_ALU || class == BPF_ALU64) {
132 if (BPF_OP(insn->code) == BPF_END) {
133 if (class == BPF_ALU64)
134 verbose(cbs->private_data, "BUG_alu64_%02x\n", insn->code);
136 print_bpf_end_insn(verbose, cbs->private_data, insn);
137 } else if (BPF_OP(insn->code) == BPF_NEG) {
138 verbose(cbs->private_data, "(%02x) %c%d = -%c%d\n",
139 insn->code, class == BPF_ALU ? 'w' : 'r',
140 insn->dst_reg, class == BPF_ALU ? 'w' : 'r',
142 } else if (BPF_SRC(insn->code) == BPF_X) {
143 verbose(cbs->private_data, "(%02x) %c%d %s %c%d\n",
144 insn->code, class == BPF_ALU ? 'w' : 'r',
146 bpf_alu_string[BPF_OP(insn->code) >> 4],
147 class == BPF_ALU ? 'w' : 'r',
150 verbose(cbs->private_data, "(%02x) %c%d %s %d\n",
151 insn->code, class == BPF_ALU ? 'w' : 'r',
153 bpf_alu_string[BPF_OP(insn->code) >> 4],
156 } else if (class == BPF_STX) {
157 if (BPF_MODE(insn->code) == BPF_MEM)
158 verbose(cbs->private_data, "(%02x) *(%s *)(r%d %+d) = r%d\n",
160 bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
162 insn->off, insn->src_reg);
163 else if (BPF_MODE(insn->code) == BPF_ATOMIC &&
164 (insn->imm == BPF_ADD || insn->imm == BPF_AND ||
165 insn->imm == BPF_OR || insn->imm == BPF_XOR)) {
166 verbose(cbs->private_data, "(%02x) lock *(%s *)(r%d %+d) %s r%d\n",
168 bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
169 insn->dst_reg, insn->off,
170 bpf_alu_string[BPF_OP(insn->imm) >> 4],
172 } else if (BPF_MODE(insn->code) == BPF_ATOMIC &&
173 (insn->imm == (BPF_ADD | BPF_FETCH) ||
174 insn->imm == (BPF_AND | BPF_FETCH) ||
175 insn->imm == (BPF_OR | BPF_FETCH) ||
176 insn->imm == (BPF_XOR | BPF_FETCH))) {
177 verbose(cbs->private_data, "(%02x) r%d = atomic%s_fetch_%s((%s *)(r%d %+d), r%d)\n",
178 insn->code, insn->src_reg,
179 BPF_SIZE(insn->code) == BPF_DW ? "64" : "",
180 bpf_atomic_alu_string[BPF_OP(insn->imm) >> 4],
181 bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
182 insn->dst_reg, insn->off, insn->src_reg);
183 } else if (BPF_MODE(insn->code) == BPF_ATOMIC &&
184 insn->imm == BPF_CMPXCHG) {
185 verbose(cbs->private_data, "(%02x) r0 = atomic%s_cmpxchg((%s *)(r%d %+d), r0, r%d)\n",
187 BPF_SIZE(insn->code) == BPF_DW ? "64" : "",
188 bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
189 insn->dst_reg, insn->off,
191 } else if (BPF_MODE(insn->code) == BPF_ATOMIC &&
192 insn->imm == BPF_XCHG) {
193 verbose(cbs->private_data, "(%02x) r%d = atomic%s_xchg((%s *)(r%d %+d), r%d)\n",
194 insn->code, insn->src_reg,
195 BPF_SIZE(insn->code) == BPF_DW ? "64" : "",
196 bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
197 insn->dst_reg, insn->off, insn->src_reg);
199 verbose(cbs->private_data, "BUG_%02x\n", insn->code);
201 } else if (class == BPF_ST) {
202 if (BPF_MODE(insn->code) != BPF_MEM) {
203 verbose(cbs->private_data, "BUG_st_%02x\n", insn->code);
206 verbose(cbs->private_data, "(%02x) *(%s *)(r%d %+d) = %d\n",
208 bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
210 insn->off, insn->imm);
211 } else if (class == BPF_LDX) {
212 if (BPF_MODE(insn->code) != BPF_MEM) {
213 verbose(cbs->private_data, "BUG_ldx_%02x\n", insn->code);
216 verbose(cbs->private_data, "(%02x) r%d = *(%s *)(r%d %+d)\n",
217 insn->code, insn->dst_reg,
218 bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
219 insn->src_reg, insn->off);
220 } else if (class == BPF_LD) {
221 if (BPF_MODE(insn->code) == BPF_ABS) {
222 verbose(cbs->private_data, "(%02x) r0 = *(%s *)skb[%d]\n",
224 bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
226 } else if (BPF_MODE(insn->code) == BPF_IND) {
227 verbose(cbs->private_data, "(%02x) r0 = *(%s *)skb[r%d + %d]\n",
229 bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
230 insn->src_reg, insn->imm);
231 } else if (BPF_MODE(insn->code) == BPF_IMM &&
232 BPF_SIZE(insn->code) == BPF_DW) {
233 /* At this point, we already made sure that the second
234 * part of the ldimm64 insn is accessible.
236 u64 imm = ((u64)(insn + 1)->imm << 32) | (u32)insn->imm;
237 bool is_ptr = insn->src_reg == BPF_PSEUDO_MAP_FD ||
238 insn->src_reg == BPF_PSEUDO_MAP_VALUE;
241 if (is_ptr && !allow_ptr_leaks)
244 verbose(cbs->private_data, "(%02x) r%d = %s\n",
245 insn->code, insn->dst_reg,
246 __func_imm_name(cbs, insn, imm,
249 verbose(cbs->private_data, "BUG_ld_%02x\n", insn->code);
252 } else if (class == BPF_JMP32 || class == BPF_JMP) {
253 u8 opcode = BPF_OP(insn->code);
255 if (opcode == BPF_CALL) {
258 if (insn->src_reg == BPF_PSEUDO_CALL) {
259 verbose(cbs->private_data, "(%02x) call pc%s\n",
261 __func_get_name(cbs, insn,
264 strcpy(tmp, "unknown");
265 verbose(cbs->private_data, "(%02x) call %s#%d\n", insn->code,
266 __func_get_name(cbs, insn,
270 } else if (insn->code == (BPF_JMP | BPF_JA)) {
271 verbose(cbs->private_data, "(%02x) goto pc%+d\n",
272 insn->code, insn->off);
273 } else if (insn->code == (BPF_JMP | BPF_EXIT)) {
274 verbose(cbs->private_data, "(%02x) exit\n", insn->code);
275 } else if (BPF_SRC(insn->code) == BPF_X) {
276 verbose(cbs->private_data,
277 "(%02x) if %c%d %s %c%d goto pc%+d\n",
278 insn->code, class == BPF_JMP32 ? 'w' : 'r',
280 bpf_jmp_string[BPF_OP(insn->code) >> 4],
281 class == BPF_JMP32 ? 'w' : 'r',
282 insn->src_reg, insn->off);
284 verbose(cbs->private_data,
285 "(%02x) if %c%d %s 0x%x goto pc%+d\n",
286 insn->code, class == BPF_JMP32 ? 'w' : 'r',
288 bpf_jmp_string[BPF_OP(insn->code) >> 4],
289 insn->imm, insn->off);
292 verbose(cbs->private_data, "(%02x) %s\n",
293 insn->code, bpf_class_string[class]);