154 строки
2.9 KiB
C
154 строки
2.9 KiB
C
// 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;
|
|
}
|