tools/objtool/include/objtool/warn.h

   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 */