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 <errno.h>
15 #include <objtool/builtin.h>
16 #include <objtool/elf.h>
17
18 extern const char *objname;
19
offstr(struct section * sec,unsigned long offset)20 static inline char *offstr(struct section *sec, unsigned long offset)
21 {
22 bool is_text = (sec->sh.sh_flags & SHF_EXECINSTR);
23 struct symbol *sym = NULL;
24 char *str;
25 int len;
26
27 if (is_text)
28 sym = find_func_containing(sec, offset);
29 if (!sym)
30 sym = find_symbol_containing(sec, offset);
31
32 if (sym) {
33 str = malloc(strlen(sym->name) + strlen(sec->name) + 40);
34 len = sprintf(str, "%s+0x%lx", sym->name, offset - sym->offset);
35 if (opts.sec_address)
36 sprintf(str+len, " (%s+0x%lx)", sec->name, offset);
37 } else {
38 str = malloc(strlen(sec->name) + 20);
39 sprintf(str, "%s+0x%lx", sec->name, offset);
40 }
41
42 return str;
43 }
44
45 #define ___WARN(severity, extra, format, ...) \
46 fprintf(stderr, \
47 "%s%s%s: objtool" extra ": " format "\n", \
48 objname ?: "", \
49 objname ? ": " : "", \
50 severity, \
51 ##__VA_ARGS__)
52
53 #define __WARN(severity, format, ...) \
54 ___WARN(severity, "", format, ##__VA_ARGS__)
55
56 #define __WARN_LINE(severity, format, ...) \
57 ___WARN(severity, " [%s:%d]", format, __FILE__, __LINE__, ##__VA_ARGS__)
58
59 #define __WARN_ELF(severity, format, ...) \
60 __WARN_LINE(severity, "%s: " format " failed: %s", __func__, ##__VA_ARGS__, elf_errmsg(-1))
61
62 #define __WARN_GLIBC(severity, format, ...) \
63 __WARN_LINE(severity, "%s: " format " failed: %s", __func__, ##__VA_ARGS__, strerror(errno))
64
65 #define __WARN_FUNC(severity, sec, offset, format, ...) \
66 ({ \
67 char *_str = offstr(sec, offset); \
68 __WARN(severity, "%s: " format, _str, ##__VA_ARGS__); \
69 free(_str); \
70 })
71
72 #define WARN_STR (opts.werror ? "error" : "warning")
73
74 #define WARN(format, ...) __WARN(WARN_STR, format, ##__VA_ARGS__)
75 #define WARN_FUNC(sec, offset, format, ...) __WARN_FUNC(WARN_STR, sec, offset, format, ##__VA_ARGS__)
76
77 #define WARN_INSN(insn, format, ...) \
78 ({ \
79 struct instruction *_insn = (insn); \
80 if (!_insn->sym || !_insn->sym->warned) \
81 WARN_FUNC(_insn->sec, _insn->offset, format, \
82 ##__VA_ARGS__); \
83 if (_insn->sym) \
84 _insn->sym->warned = 1; \
85 })
86
87 #define BT_INSN(insn, format, ...) \
88 ({ \
89 if (opts.verbose || opts.backtrace) { \
90 struct instruction *_insn = (insn); \
91 char *_str = offstr(_insn->sec, _insn->offset); \
92 WARN(" %s: " format, _str, ##__VA_ARGS__); \
93 free(_str); \
94 } \
95 })
96
97 #define ERROR_STR "error"
98
99 #define ERROR(format, ...) __WARN(ERROR_STR, format, ##__VA_ARGS__)
100 #define ERROR_ELF(format, ...) __WARN_ELF(ERROR_STR, format, ##__VA_ARGS__)
101 #define ERROR_GLIBC(format, ...) __WARN_GLIBC(ERROR_STR, format, ##__VA_ARGS__)
102 #define ERROR_FUNC(sec, offset, format, ...) __WARN_FUNC(ERROR_STR, sec, offset, format, ##__VA_ARGS__)
103 #define ERROR_INSN(insn, format, ...) WARN_FUNC(insn->sec, insn->offset, format, ##__VA_ARGS__)
104
105 #endif /* _WARN_H */
106