^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Based on:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Minimal BPF JIT image disassembler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Disassembles BPF JIT compiler emitted opcodes back to asm insn's for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * debugging or verification purposes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright 2013 Daniel Borkmann <daniel@iogearbox.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Licensed under the GNU General Public License, version 2.0 (GPLv2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define _GNU_SOURCE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <stdarg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <stdint.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <assert.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <bfd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <dis-asm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <limits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <bpf/libbpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include "json_writer.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include "main.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static void get_exec_path(char *tpath, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) const char *path = "/proc/self/exe";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) ssize_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) len = readlink(path, tpath, size - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) assert(len > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) tpath[len] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static int oper_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static int fprintf_json(void *out, const char *fmt, ...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) va_list ap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) char *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) va_start(ap, fmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) err = vasprintf(&s, fmt, ap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) va_end(ap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (!oper_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /* Strip trailing spaces */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) i = strlen(s) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) while (s[i] == ' ')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) s[i--] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) jsonw_string_field(json_wtr, "operation", s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) jsonw_name(json_wtr, "operands");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) jsonw_start_array(json_wtr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) oper_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) } else if (!strcmp(fmt, ",")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* Skip */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) jsonw_string(json_wtr, s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) oper_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) free(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) const char *arch, const char *disassembler_options,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) const struct btf *btf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) const struct bpf_prog_linfo *prog_linfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) __u64 func_ksym, unsigned int func_idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) bool linum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) const struct bpf_line_info *linfo = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) disassembler_ftype disassemble;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct disassemble_info info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) unsigned int nr_skip = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int count, i, pc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) char tpath[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) bfd *bfdf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (!len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) memset(tpath, 0, sizeof(tpath));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) get_exec_path(tpath, sizeof(tpath));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) bfdf = bfd_openr(tpath, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) assert(bfdf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) assert(bfd_check_format(bfdf, bfd_object));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (json_output)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) init_disassemble_info(&info, stdout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) (fprintf_ftype) fprintf_json);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) init_disassemble_info(&info, stdout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) (fprintf_ftype) fprintf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /* Update architecture info for offload. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (arch) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) const bfd_arch_info_type *inf = bfd_scan_arch(arch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (inf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) bfdf->arch_info = inf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) p_err("No libbfd support for %s", arch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) info.arch = bfd_get_arch(bfdf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) info.mach = bfd_get_mach(bfdf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (disassembler_options)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) info.disassembler_options = disassembler_options;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) info.buffer = image;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) info.buffer_length = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) disassemble_init_for_target(&info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) #ifdef DISASM_FOUR_ARGS_SIGNATURE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) disassemble = disassembler(info.arch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) bfd_big_endian(bfdf),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) info.mach,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) bfdf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) disassemble = disassembler(bfdf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) assert(disassemble);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (json_output)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) jsonw_start_array(json_wtr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (prog_linfo) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) linfo = bpf_prog_linfo__lfind_addr_func(prog_linfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) func_ksym + pc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) func_idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) nr_skip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (linfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) nr_skip++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (json_output) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) jsonw_start_object(json_wtr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) oper_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (linfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) btf_dump_linfo_json(btf, linfo, linum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) jsonw_name(json_wtr, "pc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) jsonw_printf(json_wtr, "\"0x%x\"", pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (linfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) btf_dump_linfo_plain(btf, linfo, "; ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) linum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) printf("%4x:\t", pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) count = disassemble(pc, &info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (json_output) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /* Operand array, was started in fprintf_json. Before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * that, make sure we have a _null_ value if no operand
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * other than operation code was present.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (oper_count == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) jsonw_null(json_wtr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) jsonw_end_array(json_wtr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (opcodes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (json_output) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) jsonw_name(json_wtr, "opcodes");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) jsonw_start_array(json_wtr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) for (i = 0; i < count; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) jsonw_printf(json_wtr, "\"0x%02hhx\"",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) (uint8_t)image[pc + i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) jsonw_end_array(json_wtr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) printf("\n\t");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) for (i = 0; i < count; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) printf("%02x ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) (uint8_t)image[pc + i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (json_output)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) jsonw_end_object(json_wtr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) printf("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) pc += count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) } while (count > 0 && pc < len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (json_output)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) jsonw_end_array(json_wtr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) bfd_close(bfdf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) int disasm_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) bfd_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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