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/* * Based on: * * Minimal BPF JIT image disassembler * * Disassembles BPF JIT compiler emitted opcodes back to asm insn's for * debugging or verification purposes. * * Copyright 2013 Daniel Borkmann <daniel@iogearbox.net> * Licensed under the GNU General Public License, version 2.0 (GPLv2) */ #include <stdarg.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <assert.h> #include <unistd.h> #include <string.h> #include <bfd.h> #include <dis-asm.h> #include <sys/types.h> #include <sys/stat.h> #include <limits.h> #include "json_writer.h" #include "main.h" static void get_exec_path(char *tpath, size_t size) { ssize_t len; char *path; snprintf(tpath, size, "/proc/%d/exe", (int) getpid()); tpath[size - 1] = 0; path = strdup(tpath); assert(path); len = readlink(path, tpath, size - 1); assert(len > 0); tpath[len] = 0; free(path); } static int oper_count; static int fprintf_json(void *out, const char *fmt, ...) { va_list ap; char *s; va_start(ap, fmt); if (!oper_count) { int i; s = va_arg(ap, char *); /* Strip trailing spaces */ i = strlen(s) - 1; while (s[i] == ' ') s[i--] = '\0'; jsonw_string_field(json_wtr, "operation", s); jsonw_name(json_wtr, "operands"); jsonw_start_array(json_wtr); oper_count++; } else if (!strcmp(fmt, ",")) { /* Skip */ } else { s = va_arg(ap, char *); jsonw_string(json_wtr, s); oper_count++; } va_end(ap); return 0; } void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes, const char *arch) { disassembler_ftype disassemble; struct disassemble_info info; int count, i, pc = 0; char tpath[PATH_MAX]; bfd *bfdf; if (!len) return; memset(tpath, 0, sizeof(tpath)); get_exec_path(tpath, sizeof(tpath)); bfdf = bfd_openr(tpath, NULL); assert(bfdf); assert(bfd_check_format(bfdf, bfd_object)); if (json_output) init_disassemble_info(&info, stdout, (fprintf_ftype) fprintf_json); else init_disassemble_info(&info, stdout, (fprintf_ftype) fprintf); /* Update architecture info for offload. */ if (arch) { const bfd_arch_info_type *inf = bfd_scan_arch(arch); if (inf) { bfdf->arch_info = inf; } else { p_err("No libfd support for %s", arch); return; } } info.arch = bfd_get_arch(bfdf); info.mach = bfd_get_mach(bfdf); info.buffer = image; info.buffer_length = len; disassemble_init_for_target(&info); #ifdef DISASM_FOUR_ARGS_SIGNATURE disassemble = disassembler(info.arch, bfd_big_endian(bfdf), info.mach, bfdf); #else disassemble = disassembler(bfdf); #endif assert(disassemble); if (json_output) jsonw_start_array(json_wtr); do { if (json_output) { jsonw_start_object(json_wtr); oper_count = 0; jsonw_name(json_wtr, "pc"); jsonw_printf(json_wtr, "\"0x%x\"", pc); } else { printf("%4x:\t", pc); } count = disassemble(pc, &info); if (json_output) { /* Operand array, was started in fprintf_json. Before * that, make sure we have a _null_ value if no operand * other than operation code was present. */ if (oper_count == 1) jsonw_null(json_wtr); jsonw_end_array(json_wtr); } if (opcodes) { if (json_output) { jsonw_name(json_wtr, "opcodes"); jsonw_start_array(json_wtr); for (i = 0; i < count; ++i) jsonw_printf(json_wtr, "\"0x%02hhx\"", (uint8_t)image[pc + i]); jsonw_end_array(json_wtr); } else { printf("\n\t"); for (i = 0; i < count; ++i) printf("%02x ", (uint8_t)image[pc + i]); } } if (json_output) jsonw_end_object(json_wtr); else printf("\n"); pc += count; } while (count > 0 && pc < len); if (json_output) jsonw_end_array(json_wtr); bfd_close(bfdf); }
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