1 eˆÒÔ ƒuçƒÑÀÖÉe// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2015-2017 Josh Poimboeuf */ #include #include #include #include #include #include #include #include #include #include #include #define ORIG_SUFFIX ".orig" int orig_argc; static char **orig_argv; const char *objname; struct opts opts; static const char * const check_usage[] = { "objtool [] file.o", NULL, }; static const char * const env_usage[] = { "OBJTOOL_ARGS=\"\"", NULL, }; static int parse_dump(const struct option *opt, const char *str, int unset) { if (!str || !strcmp(str, "orc")) { opts.dump_orc = true; return 0; } return -1; } static int parse_hacks(const struct option *opt, const char *str, int unset) { bool found = false; /* * Use strstr() as a lazy method of checking for comma-separated * options. * * No string provided == enable all options. */ if (!str || strstr(str, "jump_label")) { opts.hack_jump_label = true; found = true; } if (!str || strstr(str, "noinstr")) { opts.hack_noinstr = true; found = true; } if (!str || strstr(str, "skylake")) { opts.hack_skylake = true; found = true; } return found ? 0 : -1; } static const struct option check_options[] = { OPT_GROUP("Actions:"), OPT_CALLBACK_OPTARG('h', "hacks", NULL, NULL, "jump_label,noinstr,skylake", "patch toolchain bugs/limitations", parse_hacks), OPT_BOOLEAN('i', "ibt", &opts.ibt, "validate and annotate IBT"), OPT_BOOLEAN('m', "mcount", &opts.mcount, "annotate mcount/fentry calls for ftrace"), OPT_BOOLEAN('n', "noinstr", &opts.noinstr, "validate noinstr rules"), OPT_BOOLEAN(0, "orc", &opts.orc, "generate ORC metadata"), OPT_BOOLEAN('r', "retpoline", &opts.retpoline, "validate and annotate retpoline usage"), OPT_BOOLEAN(0, "rethunk", &opts.rethunk, "validate and annotate rethunk usage"), OPT_BOOLEAN(0, "unret", &opts.unret, "validate entry unret placement"), OPT_INTEGER(0, "prefix", &opts.prefix, "generate prefix symbols"), OPT_BOOLEAN('l', "sls", &opts.sls, "validate straight-line-speculation mitigations"), OPT_BOOLEAN('s', "stackval", &opts.stackval, "validate frame pointer rules"), OPT_BOOLEAN('t', "static-call", &opts.static_call, "annotate static calls"), OPT_BOOLEAN('u', "uaccess", &opts.uaccess, "validate uaccess rules for SMAP"), OPT_BOOLEAN(0 , "cfi", &opts.cfi, "annotate kernel control flow integrity (kCFI) function preambles"), OPT_CALLBACK_OPTARG(0, "dump", NULL, NULL, "orc", "dump metadata", parse_dump), OPT_GROUP("Options:"), OPT_BOOLEAN(0, "backtrace", &opts.backtrace, "unwind on error"), OPT_BOOLEAN(0, "dry-run", &opts.dryrun, "don't write modifications"), OPT_BOOLEAN(0, "link", &opts.link, "object is a linked object"), OPT_BOOLEAN(0, "module", &opts.module, "object is part of a kernel module"), OPT_BOOLEAN(0, "mnop", &opts.mnop, "nop out mcount call sites"), OPT_BOOLEAN(0, "no-unreachable", &opts.no_unreachable, "skip 'unreachable instruction' warnings"), OPT_STRING('o', "output", &opts.output, "file", "output file name"), OPT_BOOLEAN(0, "sec-address", &opts.sec_address, "print section addresses in warnings"), OPT_BOOLEAN(0, "stats", &opts.stats, "print statistics"), OPT_BOOLEAN('v', "verbose", &opts.verbose, "verbose warnings"), OPT_BOOLEAN(0, "Werror", &opts.werror, "return error on warnings"), OPT_END(), }; int cmd_parse_options(int argc, const char **argv, const char * const usage[]) { const char *envv[16] = { }; char *env; int envc; env = getenv("OBJTOOL_ARGS"); if (env) { envv[0] = "OBJTOOL_ARGS"; for (envc = 1; envc < ARRAY_SIZE(envv); ) { envv[envc++] = env; env = strchr(env, ' '); if (!env) break; *env = '\0'; env++; } parse_options(envc, envv, check_options, env_usage, 0); } env = getenv("OBJTOOL_VERBOSE"); if (env && !strcmp(env, "1")) opts.verbose = true; argc = pa