tools/bpf/bpf_jit_disasm.c

1 // SPDX-License-Identifier: GPL-2.0-only
11  *  2) Load a BPF filter (e.g. `tcpdump -p -n -s 0 -i eth1 host 192.168.20.0/24`)
12  *  3) Run e.g. `bpf_jit_disasm -o` to read out the last JIT code
24 #include <dis-asm.h>
41 	tpath[size - 1] = 0;  in get_exec_path()
54 	int count, i, pc = 0;  in get_asm_insns()  local
86 		printf("%4x:\t", pc);  in get_asm_insns()
88 		count = disassemble(pc, &info);  in get_asm_insns()
93 				printf("%02x ", (uint8_t) image[pc + i]);  in get_asm_insns()
97 		pc += count;  in get_asm_insns()
98 	} while(count > 0 && pc < len);  in get_asm_insns()
146 	ret = read(fd, buff, len - 1);  in get_flog_buff()
202 	ptr = haystack + off - (pmatch[0].rm_eo - pmatch[0].rm_so);  in get_last_jit_image()
233 				ulen--;  in get_last_jit_image()
255 	printf("       -o          Also display related opcodes (default: off).\n");  in usage()
256 	printf("       -O <file>   Write binary image of code to file, don't disassemble to stdout.\n");  in usage()
257 	printf("       -f <file>   Read last image dump from file or stdin (default: klog).\n");  in usage()
258 	printf("       -h          Display this help.\n");  in usage()
271 	while ((opt = getopt(argc, argv, "of:O:")) != -1) {  in main()
284 			return -1;  in main()
293 		return -1;  in main()
298 		fprintf(stderr, "No JIT image found!\n");  in main()
314 		nr = write(ofd, pos, len);  in main()
316 			fprintf(stderr, "Could not write data to %s: ", ofile);  in main()
320 		len -= nr;  in main()