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