1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
4 */
5
6 #ifndef _WARN_H
7 #define _WARN_H
8
9 #include <stdlib.h>
10 #include <string.h>
11 #include <sys/types.h>
12 #include <sys/stat.h>
13 #include <fcntl.h>
14 #include <objtool/builtin.h>
15 #include <objtool/elf.h>
16
17 extern const char *objname;
18
19 static inline char *offstr(struct section *sec, unsigned long offset)
20 {
21 bool is_text = (sec->sh.sh_flags & SHF_EXECINSTR);
22 struct symbol *sym = NULL;
23 char *str;
24 int len;
25
26 if (is_text)
27 sym = find_func_containing(sec, offset);
28 if (!sym)
29 sym = find_symbol_containing(sec, offset);
30
31 if (sym) {
32 str = malloc(strlen(sym->name) + strlen(sec->name) + 40);
33 len = sprintf(str, "%s+0x%lx", sym->name, offset - sym->offset);
34 if (opts.sec_address)
35 sprintf(str+len, " (%s+0x%lx)", sec->name, offset);
36 } else {
37 str = malloc(strlen(sec->name) + 20);
38 sprintf(str, "%s+0x%lx", sec->name, offset);
39 }
40
41 return str;
42 }
43
44 #define WARN(format, ...) \
45 fprintf(stderr, \
46 "%s: warning: objtool: " format "\n", \
47 objname, ##__VA_ARGS__)
48
49 #define WARN_FUNC(format, sec, offset, ...) \
50 ({ \
51 char *_str = offstr(sec, offset); \
52 WARN("%s: " format, _str, ##__VA_ARGS__); \
53 free(_str); \
54 })
55
56 #define WARN_INSN(insn, format, ...) \
57 ({ \
58 struct instruction *_insn = (insn); \
59 if (!_insn->sym || !_insn->sym->warned) \
60 WARN_FUNC(format, _insn->sec, _insn->offset, \
61 ##__VA_ARGS__); \
62 if (_insn->sym) \
63 _insn->sym->warned = 1; \
64 })
65
66 #define BT_INSN(insn, format, ...) \
67 ({ \
68 if (opts.verbose || opts.backtrace) { \
69 struct instruction *_insn = (insn); \
70 char *_str = offstr(_insn->sec, _insn->offset); \
71 WARN(" %s: " format, _str, ##__VA_ARGS__); \
72 free(_str); \
73 } \
74 })
75
76 #define WARN_ELF(format, ...) \
77 WARN(format ": %s", ##__VA_ARGS__, elf_errmsg(-1))
78
79 #endif /* _WARN_H */
80
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