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212 lines
4.9 KiB
212 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2015-2017 Josh Poimboeuf <[email protected]> |
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*/ |
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#include <subcmd/parse-options.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include <objtool/builtin.h> |
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#include <objtool/objtool.h> |
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#define ERROR(format, ...) \ |
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fprintf(stderr, \ |
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"error: objtool: " format "\n", \ |
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##__VA_ARGS__) |
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struct opts opts; |
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static const char * const check_usage[] = { |
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"objtool <actions> [<options>] file.o", |
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NULL, |
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}; |
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static const char * const env_usage[] = { |
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"OBJTOOL_ARGS=\"<options>\"", |
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NULL, |
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}; |
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static int parse_dump(const struct option *opt, const char *str, int unset) |
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{ |
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if (!str || !strcmp(str, "orc")) { |
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opts.dump_orc = true; |
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return 0; |
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} |
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return -1; |
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} |
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static int parse_hacks(const struct option *opt, const char *str, int unset) |
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{ |
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bool found = false; |
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/* |
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* Use strstr() as a lazy method of checking for comma-separated |
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* options. |
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* |
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* No string provided == enable all options. |
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*/ |
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if (!str || strstr(str, "jump_label")) { |
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opts.hack_jump_label = true; |
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found = true; |
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} |
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if (!str || strstr(str, "noinstr")) { |
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opts.hack_noinstr = true; |
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found = true; |
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} |
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return found ? 0 : -1; |
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} |
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const struct option check_options[] = { |
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OPT_GROUP("Actions:"), |
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OPT_CALLBACK_OPTARG('h', "hacks", NULL, NULL, "jump_label,noinstr", "patch toolchain bugs/limitations", parse_hacks), |
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OPT_BOOLEAN('i', "ibt", &opts.ibt, "validate and annotate IBT"), |
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OPT_BOOLEAN('m', "mcount", &opts.mcount, "annotate mcount/fentry calls for ftrace"), |
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OPT_BOOLEAN('n', "noinstr", &opts.noinstr, "validate noinstr rules"), |
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OPT_BOOLEAN('o', "orc", &opts.orc, "generate ORC metadata"), |
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OPT_BOOLEAN('r', "retpoline", &opts.retpoline, "validate and annotate retpoline usage"), |
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OPT_BOOLEAN(0, "rethunk", &opts.rethunk, "validate and annotate rethunk usage"), |
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OPT_BOOLEAN(0, "unret", &opts.unret, "validate entry unret placement"), |
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OPT_BOOLEAN('l', "sls", &opts.sls, "validate straight-line-speculation mitigations"), |
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OPT_BOOLEAN('s', "stackval", &opts.stackval, "validate frame pointer rules"), |
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OPT_BOOLEAN('t', "static-call", &opts.static_call, "annotate static calls"), |
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OPT_BOOLEAN('u', "uaccess", &opts.uaccess, "validate uaccess rules for SMAP"), |
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OPT_CALLBACK_OPTARG(0, "dump", NULL, NULL, "orc", "dump metadata", parse_dump), |
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OPT_GROUP("Options:"), |
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OPT_BOOLEAN(0, "backtrace", &opts.backtrace, "unwind on error"), |
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OPT_BOOLEAN(0, "backup", &opts.backup, "create .orig files before modification"), |
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OPT_BOOLEAN(0, "dry-run", &opts.dryrun, "don't write modifications"), |
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OPT_BOOLEAN(0, "link", &opts.link, "object is a linked object"), |
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OPT_BOOLEAN(0, "module", &opts.module, "object is part of a kernel module"), |
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OPT_BOOLEAN(0, "no-unreachable", &opts.no_unreachable, "skip 'unreachable instruction' warnings"), |
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OPT_BOOLEAN(0, "sec-address", &opts.sec_address, "print section addresses in warnings"), |
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OPT_BOOLEAN(0, "stats", &opts.stats, "print statistics"), |
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OPT_END(), |
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}; |
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int cmd_parse_options(int argc, const char **argv, const char * const usage[]) |
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{ |
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const char *envv[16] = { }; |
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char *env; |
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int envc; |
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env = getenv("OBJTOOL_ARGS"); |
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if (env) { |
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envv[0] = "OBJTOOL_ARGS"; |
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for (envc = 1; envc < ARRAY_SIZE(envv); ) { |
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envv[envc++] = env; |
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env = strchr(env, ' '); |
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if (!env) |
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break; |
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*env = '\0'; |
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env++; |
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} |
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parse_options(envc, envv, check_options, env_usage, 0); |
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} |
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argc = parse_options(argc, argv, check_options, usage, 0); |
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if (argc != 1) |
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usage_with_options(usage, check_options); |
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return argc; |
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} |
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static bool opts_valid(void) |
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{ |
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if (opts.hack_jump_label || |
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opts.hack_noinstr || |
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opts.ibt || |
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opts.mcount || |
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opts.noinstr || |
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opts.orc || |
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opts.retpoline || |
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opts.rethunk || |
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opts.sls || |
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opts.stackval || |
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opts.static_call || |
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opts.uaccess) { |
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if (opts.dump_orc) { |
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ERROR("--dump can't be combined with other options"); |
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return false; |
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} |
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return true; |
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} |
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if (opts.unret && !opts.rethunk) { |
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ERROR("--unret requires --rethunk"); |
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return false; |
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} |
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if (opts.dump_orc) |
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return true; |
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ERROR("At least one command required"); |
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return false; |
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} |
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static bool link_opts_valid(struct objtool_file *file) |
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{ |
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if (opts.link) |
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return true; |
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if (has_multiple_files(file->elf)) { |
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ERROR("Linked object detected, forcing --link"); |
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opts.link = true; |
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return true; |
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} |
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if (opts.noinstr) { |
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ERROR("--noinstr requires --link"); |
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return false; |
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} |
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if (opts.ibt) { |
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ERROR("--ibt requires --link"); |
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return false; |
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} |
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if (opts.unret) { |
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ERROR("--unret requires --link"); |
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return false; |
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} |
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return true; |
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} |
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int objtool_run(int argc, const char **argv) |
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{ |
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const char *objname; |
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struct objtool_file *file; |
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int ret; |
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argc = cmd_parse_options(argc, argv, check_usage); |
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objname = argv[0]; |
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if (!opts_valid()) |
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return 1; |
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if (opts.dump_orc) |
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return orc_dump(objname); |
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file = objtool_open_read(objname); |
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if (!file) |
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return 1; |
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if (!link_opts_valid(file)) |
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return 1; |
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ret = check(file); |
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if (ret) |
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return ret; |
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if (file->elf->changed) |
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return elf_write(file->elf); |
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return 0; |
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}
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