selftests/bpf/disasm.c

1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
22 	if (!insn->src_reg &&
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) {
30 		res = cbs->cb_call(cbs->private_data, insn);
35 	if (insn->src_reg == BPF_PSEUDO_CALL)
36 		snprintf(buff, len, "%+d", insn->imm);
37 	else if (insn->src_reg == BPF_PSEUDO_KFUNC_CALL)
38 		snprintf(buff, len, "kernel-function");
47 	if (cbs && cbs->cb_imm)
48 		return cbs->cb_imm(cbs->private_data, insn, full_imm);
75 	[BPF_SUB >> 4]  = "-=",
142 	verbose(private_data, "(%02x) r%d = %s%d r%d\n",
143 		insn->code, insn->dst_reg,
144 		BPF_SRC(insn->code) == BPF_TO_BE ? "be" : "le",
145 		insn->imm, insn->dst_reg);
152 	verbose(private_data, "(%02x) r%d = bswap%d r%d\n",
153 		insn->code, insn->dst_reg,
154 		insn->imm, insn->dst_reg);
159 	return (BPF_OP(insn->code)  == BPF_DIV || BPF_OP(insn->code) == BPF_MOD) &&
160 	       insn->off == 1;
165 	return BPF_OP(insn->code) == BPF_MOV &&
166 	       (insn->off == 8 || insn->off == 16 || insn->off == 32);
173 	const bpf_insn_print_t verbose = cbs->cb_print;
174 	u8 class = BPF_CLASS(insn->code);
176 	if (class == BPF_ALU || class == BPF_ALU64) {
177 		if (BPF_OP(insn->code) == BPF_END) {
178 			if (class == BPF_ALU64)
179 				print_bpf_bswap_insn(verbose, cbs->private_data, insn);
181 				print_bpf_end_insn(verbose, cbs->private_data, insn);
182 		} else if (BPF_OP(insn->code) == BPF_NEG) {
183 			verbose(cbs->private_data, "(%02x) %c%d = -%c%d\n",
184 				insn->code, class == BPF_ALU ? 'w' : 'r',
185 				insn->dst_reg, class == BPF_ALU ? 'w' : 'r',
186 				insn->dst_reg);
187 		} else if (BPF_SRC(insn->code) == BPF_X) {
188 			verbose(cbs->private_data, "(%02x) %c%d %s %s%c%d\n",
189 				insn->code, class == BPF_ALU ? 'w' : 'r',
190 				insn->dst_reg,
191 				is_sdiv_smod(insn) ? bpf_alu_sign_string[BPF_OP(insn->code) >> 4]
192 						   : bpf_alu_string[BPF_OP(insn->code) >> 4],
193 				is_movsx(insn) ? bpf_movsx_string[(insn->off >> 3) - 1] : "",
194 				class == BPF_ALU ? 'w' : 'r',
195 				insn->src_reg);
197 			verbose(cbs->private_data, "(%02x) %c%d %s %d\n",
198 				insn->code, class == BPF_ALU ? 'w' : 'r',
199 				insn->dst_reg,
200 				is_sdiv_smod(insn) ? bpf_alu_sign_string[BPF_OP(insn->code) >> 4]
201 						   : bpf_alu_string[BPF_OP(insn->code) >> 4],
202 				insn->imm);
204 	} else if (class == BPF_STX) {
205 		if (BPF_MODE(insn->code) == BPF_MEM)
206 			verbose(cbs->private_data, "(%02x) *(%s *)(r%d %+d) = r%d\n",
207 				insn->code,
208 				bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
209 				insn->dst_reg,
210 				insn->off, insn->src_reg);
211 		else if (BPF_MODE(insn->code) == BPF_ATOMIC &&
212 			 (insn->imm == BPF_ADD || insn->imm == BPF_AND ||
213 			  insn->imm == BPF_OR || insn->imm == BPF_XOR)) {
214 			verbose(cbs->private_data, "(%02x) lock *(%s *)(r%d %+d) %s r%d\n",
215 				insn->code,
216 				bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
217 				insn->dst_reg, insn->off,
218 				bpf_alu_string[BPF_OP(insn->imm) >> 4],
219 				insn->src_reg);
220 		} else if (BPF_MODE(insn->code) == BPF_ATOMIC &&
221 			   (insn->imm == (BPF_ADD | BPF_FETCH) ||
222 			    insn->imm == (BPF_AND | BPF_FETCH) ||
223 			    insn->imm == (BPF_OR | BPF_FETCH) ||
224 			    insn->imm == (BPF_XOR | BPF_FETCH))) {
225 			verbose(cbs->private_data, "(%02x) r%d = atomic%s_fetch_%s((%s *)(r%d %+d), r%d)\n",
226 				insn->code, insn->src_reg,
227 				BPF_SIZE(insn->code) == BPF_DW ? "64" : "",
228 				bpf_atomic_alu_string[BPF_OP(insn->imm) >> 4],
229 				bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
230 				insn->dst_reg, insn->off, insn->src_reg);
231 		} else if (BPF_MODE(insn->code) == BPF_ATOMIC &&
232 			   insn->imm == BPF_CMPXCHG) {
233 			verbose(cbs->private_data, "(%02x) r0 = atomic%s_cmpxchg((%s *)(r%d %+d), r0, r%d)\n",
234 				insn->code,
235 				BPF_SIZE(insn->code) == BPF_DW ? "64" : "",
236 				bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
237 				insn->dst_reg, insn->off,
238 				insn->src_reg);
239 		} else if (BPF_MODE(insn->code) == BPF_ATOMIC &&
240 			   insn->imm == BPF_XCHG) {
241 			verbose(cbs->private_data, "(%02x) r%d = atomic%s_xchg((%s *)(r%d %+d), r%d)\n",
242 				insn->code, insn->src_reg,
243 				BPF_SIZE(insn->code) == BPF_DW ? "64" : "",
244 				bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
245 				insn->dst_reg, insn->off, insn->src_reg);
247 			verbose(cbs->private_data, "BUG_%02x\n", insn->code);
249 	} else if (class == BPF_ST) {
250 		if (BPF_MODE(insn->code) == BPF_MEM) {
251 			verbose(cbs->private_data, "(%02x) *(%s *)(r%d %+d) = %d\n",
252 				insn->code,
253 				bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
254 				insn->dst_reg,
255 				insn->off, insn->imm);
256 		} else if (BPF_MODE(insn->code) == 0xc0 /* BPF_NOSPEC, no UAPI */) {
257 			verbose(cbs->private_data, "(%02x) nospec\n", insn->code);
259 			verbose(cbs->private_data, "BUG_st_%02x\n", insn->code);
261 	} else if (class == BPF_LDX) {
262 		if (BPF_MODE(insn->code) != BPF_MEM && BPF_MODE(insn->code) != BPF_MEMSX) {
263 			verbose(cbs->private_data, "BUG_ldx_%02x\n", insn->code);
266 		verbose(cbs->private_data, "(%02x) r%d = *(%s *)(r%d %+d)\n",
267 			insn->code, insn->dst_reg,
268 			BPF_MODE(insn->code) == BPF_MEM ?
269 				 bpf_ldst_string[BPF_SIZE(insn->code) >> 3] :
270 				 bpf_ldsx_string[BPF_SIZE(insn->code) >> 3],
271 			insn->src_reg, insn->off);
272 	} else if (class == BPF_LD) {
273 		if (BPF_MODE(insn->code) == BPF_ABS) {
274 			verbose(cbs->private_data, "(%02x) r0 = *(%s *)skb[%d]\n",
275 				insn->code,
276 				bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
277 				insn->imm);
278 		} else if (BPF_MODE(insn->code) == BPF_IND) {
279 			verbose(cbs->private_data, "(%02x) r0 = *(%s *)skb[r%d + %d]\n",
280 				insn->code,
281 				bpf_ldst_string[BPF_SIZE(insn->code) >> 3],
282 				insn->src_reg, insn->imm);
283 		} else if (BPF_MODE(insn->code) == BPF_IMM &&
284 			   BPF_SIZE(insn->code) == BPF_DW) {
288 			u64 imm = ((u64)(insn + 1)->imm << 32) | (u32)insn->imm;
289 			bool is_ptr = insn->src_reg == BPF_PSEUDO_MAP_FD ||
290 				      insn->src_reg == BPF_PSEUDO_MAP_VALUE;
296 			verbose(cbs->private_data, "(%02x) r%d = %s\n",
297 				insn->code, insn->dst_reg,
301 			verbose(cbs->private_data, "BUG_ld_%02x\n", insn->code);
304 	} else if (class == BPF_JMP32 || class == BPF_JMP) {
305 		u8 opcode = BPF_OP(insn->code);
310 			if (insn->src_reg == BPF_PSEUDO_CALL) {
311 				verbose(cbs->private_data, "(%02x) call pc%s\n",
312 					insn->code,
317 				verbose(cbs->private_data, "(%02x) call %s#%d\n", insn->code,
320 					insn->imm);
322 		} else if (insn->code == (BPF_JMP | BPF_JA)) {
323 			verbose(cbs->private_data, "(%02x) goto pc%+d\n",
324 				insn->code, insn->off);
325 		} else if (insn->code == (BPF_JMP32 | BPF_JA)) {
326 			verbose(cbs->private_data, "(%02x) gotol pc%+d\n",
327 				insn->code, insn->imm);
328 		} else if (insn->code == (BPF_JMP | BPF_EXIT)) {
329 			verbose(cbs->private_data, "(%02x) exit\n", insn->code);
330 		} else if (BPF_SRC(insn->code) == BPF_X) {
331 			verbose(cbs->private_data,
332 				"(%02x) if %c%d %s %c%d goto pc%+d\n",
333 				insn->code, class == BPF_JMP32 ? 'w' : 'r',
334 				insn->dst_reg,
335 				bpf_jmp_string[BPF_OP(insn->code) >> 4],
336 				class == BPF_JMP32 ? 'w' : 'r',
337 				insn->src_reg, insn->off);
339 			verbose(cbs->private_data,
340 				"(%02x) if %c%d %s 0x%x goto pc%+d\n",
341 				insn->code, class == BPF_JMP32 ? 'w' : 'r',
342 				insn->dst_reg,
343 				bpf_jmp_string[BPF_OP(insn->code) >> 4],
344 				insn->imm, insn->off);
347 		verbose(cbs->private_data, "(%02x) %s\n",
348 			insn->code, bpf_class_string[class]);