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 BT_INSN(_insn, ""); \
84 } \
85 if (_insn->sym) \
86 _insn->sym->warned = 1; \
87 })
88
89 #define BT_INSN(insn, format, ...) \
90 ({ \
91 if (opts.verbose || opts.backtrace) { \
92 struct instruction *__insn = (insn); \
93 char *_str = offstr(__insn->sec, __insn->offset); \
94 const char *_istr = objtool_disas_insn(__insn); \
95 int _len; \
96 _len = snprintf(NULL, 0, " %s: " format, _str, ##__VA_ARGS__); \
97 _len = (_len < 50) ? 50 - _len : 0; \
98 WARN(" %s: " format " %*s%s", _str, ##__VA_ARGS__, _len, "", _istr); \
99 free(_str); \
100 __insn->trace = 1; \
101 } \
102 })
103
104 #define ERROR_STR "error"
105
106 #define ERROR(format, ...) __WARN(ERROR_STR, format, ##__VA_ARGS__)
107 #define ERROR_ELF(format, ...) __WARN_ELF(ERROR_STR, format, ##__VA_ARGS__)
108 #define ERROR_GLIBC(format, ...) __WARN_GLIBC(ERROR_STR, format, ##__VA_ARGS__)
109 #define ERROR_FUNC(sec, offset, format, ...) __WARN_FUNC(ERROR_STR, sec, offset, format, ##__VA_ARGS__)
110 #define ERROR_INSN(insn, format, ...) WARN_FUNC(insn->sec, insn->offset, format, ##__VA_ARGS__)
111
112 extern bool debug;
113 extern int indent;
114
unindent(int * unused)115 static inline void unindent(int *unused) { indent--; }
116
117 /*
118 * Clang prior to 17 is being silly and considers many __cleanup() variables
119 * as unused (because they are, their sole purpose is to go out of scope).
120 *
121 * https://github.com/llvm/llvm-project/commit/877210faa447f4cc7db87812f8ed80e398fedd61
122 */
123 #undef __cleanup
124 #define __cleanup(func) __maybe_unused __attribute__((__cleanup__(func)))
125
126 #define __dbg(format, ...) \
127 fprintf(stderr, \
128 "DEBUG: %s%s" format "\n", \
129 objname ?: "", \
130 objname ? ": " : "", \
131 ##__VA_ARGS__)
132
133 #define dbg(args...) \
134 ({ \
135 if (unlikely(debug)) \
136 __dbg(args); \
137 })
138
139 #define __dbg_indent(format, ...) \
140 ({ \
141 if (unlikely(debug)) \
142 __dbg("%*s" format, indent * 8, "", ##__VA_ARGS__); \
143 })
144
145 #define dbg_indent(args...) \
146 int __cleanup(unindent) __dummy_##__COUNTER__; \
147 __dbg_indent(args); \
148 indent++
149
150 #define dbg_checksum(func, insn, checksum) \
151 ({ \
152 if (unlikely(insn->sym && insn->sym->pfunc && \
153 insn->sym->pfunc->debug_checksum)) { \
154 char *insn_off = offstr(insn->sec, insn->offset); \
155 __dbg("checksum: %s %s %016llx", \
156 func->name, insn_off, (unsigned long long)checksum);\
157 free(insn_off); \
158 } \
159 })
160
161 #endif /* _WARN_H */
162