151 lines
2.8 KiB
C
151 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
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*/
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#include <stdio.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <subcmd/exec-cmd.h>
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#include <subcmd/pager.h>
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#include <linux/kernel.h>
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#include <objtool/builtin.h>
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#include <objtool/objtool.h>
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#include <objtool/warn.h>
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bool help;
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const char *objname;
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static struct objtool_file file;
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static bool objtool_create_backup(const char *_objname)
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{
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int len = strlen(_objname);
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char *buf, *base, *name = malloc(len+6);
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int s, d, l, t;
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if (!name) {
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perror("failed backup name malloc");
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return false;
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}
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strcpy(name, _objname);
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strcpy(name + len, ".orig");
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d = open(name, O_CREAT|O_WRONLY|O_TRUNC, 0644);
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if (d < 0) {
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perror("failed to create backup file");
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return false;
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}
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s = open(_objname, O_RDONLY);
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if (s < 0) {
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perror("failed to open orig file");
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return false;
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}
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buf = malloc(4096);
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if (!buf) {
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perror("failed backup data malloc");
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return false;
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}
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while ((l = read(s, buf, 4096)) > 0) {
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base = buf;
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do {
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t = write(d, base, l);
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if (t < 0) {
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perror("failed backup write");
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return false;
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}
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base += t;
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l -= t;
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} while (l);
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}
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if (l < 0) {
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perror("failed backup read");
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return false;
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}
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free(name);
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free(buf);
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close(d);
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close(s);
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return true;
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}
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struct objtool_file *objtool_open_read(const char *_objname)
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{
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if (objname) {
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if (strcmp(objname, _objname)) {
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WARN("won't handle more than one file at a time");
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return NULL;
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}
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return &file;
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}
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objname = _objname;
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file.elf = elf_open_read(objname, O_RDWR);
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if (!file.elf)
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return NULL;
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if (opts.backup && !objtool_create_backup(objname)) {
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WARN("can't create backup file");
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return NULL;
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}
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hash_init(file.insn_hash);
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INIT_LIST_HEAD(&file.retpoline_call_list);
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INIT_LIST_HEAD(&file.return_thunk_list);
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INIT_LIST_HEAD(&file.static_call_list);
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INIT_LIST_HEAD(&file.mcount_loc_list);
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INIT_LIST_HEAD(&file.endbr_list);
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INIT_LIST_HEAD(&file.call_list);
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file.ignore_unreachables = opts.no_unreachable;
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file.hints = false;
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return &file;
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}
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void objtool_pv_add(struct objtool_file *f, int idx, struct symbol *func)
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{
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if (!opts.noinstr)
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return;
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if (!f->pv_ops) {
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WARN("paravirt confusion");
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return;
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}
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/*
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* These functions will be patched into native code,
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* see paravirt_patch().
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*/
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if (!strcmp(func->name, "_paravirt_nop") ||
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!strcmp(func->name, "_paravirt_ident_64"))
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return;
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/* already added this function */
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if (!list_empty(&func->pv_target))
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return;
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list_add(&func->pv_target, &f->pv_ops[idx].targets);
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f->pv_ops[idx].clean = false;
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}
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int main(int argc, const char **argv)
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{
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static const char *UNUSED = "OBJTOOL_NOT_IMPLEMENTED";
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/* libsubcmd init */
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exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED);
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pager_init(UNUSED);
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return objtool_run(argc, argv);
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}
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