4 * Copyright 2011 Cavium, Inc.
6 * Some of this code was taken out of recordmcount.h written by:
8 * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved.
9 * Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc.
12 * Licensed under the GNU General Public License, version 2 (GPLv2).
15 #undef extable_ent_size
16 #undef compare_extable
36 # define extable_ent_size 16
37 # define compare_extable compare_extable_64
39 # define Elf_Addr Elf64_Addr
40 # define Elf_Ehdr Elf64_Ehdr
41 # define Elf_Shdr Elf64_Shdr
42 # define Elf_Rel Elf64_Rel
43 # define Elf_Rela Elf64_Rela
44 # define Elf_Sym Elf64_Sym
45 # define ELF_R_SYM ELF64_R_SYM
46 # define Elf_r_sym Elf64_r_sym
47 # define ELF_R_INFO ELF64_R_INFO
48 # define Elf_r_info Elf64_r_info
49 # define ELF_ST_BIND ELF64_ST_BIND
50 # define ELF_ST_TYPE ELF64_ST_TYPE
51 # define fn_ELF_R_SYM fn_ELF64_R_SYM
52 # define fn_ELF_R_INFO fn_ELF64_R_INFO
53 # define uint_t uint64_t
56 # define extable_ent_size 8
57 # define compare_extable compare_extable_32
59 # define Elf_Addr Elf32_Addr
60 # define Elf_Ehdr Elf32_Ehdr
61 # define Elf_Shdr Elf32_Shdr
62 # define Elf_Rel Elf32_Rel
63 # define Elf_Rela Elf32_Rela
64 # define Elf_Sym Elf32_Sym
65 # define ELF_R_SYM ELF32_R_SYM
66 # define Elf_r_sym Elf32_r_sym
67 # define ELF_R_INFO ELF32_R_INFO
68 # define Elf_r_info Elf32_r_info
69 # define ELF_ST_BIND ELF32_ST_BIND
70 # define ELF_ST_TYPE ELF32_ST_TYPE
71 # define fn_ELF_R_SYM fn_ELF32_R_SYM
72 # define fn_ELF_R_INFO fn_ELF32_R_INFO
73 # define uint_t uint32_t
77 static int compare_extable(const void *a
, const void *b
)
82 if (_w(*aa
) < _w(*bb
))
84 if (_w(*aa
) > _w(*bb
))
90 do_func(Elf_Ehdr
*const ehdr
, char const *const fname
)
93 Elf_Shdr
*shstrtab_sec
;
94 Elf_Shdr
*strtab_sec
= NULL
;
95 Elf_Shdr
*symtab_sec
= NULL
;
96 Elf_Shdr
*extab_sec
= NULL
;
98 Elf_Sym
*sort_needed_sym
;
99 Elf_Shdr
*sort_needed_sec
;
100 uint32_t *sort_done_location
;
101 const char *secstrtab
;
106 shdr
= (Elf_Shdr
*)((void *)ehdr
+ _w(ehdr
->e_shoff
));
107 shstrtab_sec
= shdr
+ w2(ehdr
->e_shstrndx
);
108 secstrtab
= (const char *)ehdr
+ _w(shstrtab_sec
->sh_offset
);
109 for (i
= 0; i
< w2(ehdr
->e_shnum
); i
++) {
110 idx
= w(shdr
[i
].sh_name
);
111 if (strcmp(secstrtab
+ idx
, "__ex_table") == 0)
112 extab_sec
= shdr
+ i
;
113 if (strcmp(secstrtab
+ idx
, ".symtab") == 0)
114 symtab_sec
= shdr
+ i
;
115 if (strcmp(secstrtab
+ idx
, ".strtab") == 0)
116 strtab_sec
= shdr
+ i
;
118 if (strtab_sec
== NULL
) {
119 fprintf(stderr
, "no .strtab in file: %s\n", fname
);
122 if (symtab_sec
== NULL
) {
123 fprintf(stderr
, "no .symtab in file: %s\n", fname
);
126 if (extab_sec
== NULL
) {
127 fprintf(stderr
, "no __ex_table in file: %s\n", fname
);
130 strtab
= (const char *)ehdr
+ _w(strtab_sec
->sh_offset
);
132 /* Sort the table in place */
133 qsort((void *)ehdr
+ _w(extab_sec
->sh_offset
),
134 (_w(extab_sec
->sh_size
) / extable_ent_size
),
135 extable_ent_size
, compare_extable
);
137 /* find main_extable_sort_needed */
138 sort_needed_sym
= NULL
;
139 for (i
= 0; i
< _w(symtab_sec
->sh_size
) / sizeof(Elf_Sym
); i
++) {
140 sym
= (void *)ehdr
+ _w(symtab_sec
->sh_offset
);
142 if (ELF_ST_TYPE(sym
->st_info
) != STT_OBJECT
)
144 idx
= w(sym
->st_name
);
145 if (strcmp(strtab
+ idx
, "main_extable_sort_needed") == 0) {
146 sort_needed_sym
= sym
;
150 if (sort_needed_sym
== NULL
) {
152 "no main_extable_sort_needed symbol in file: %s\n",
156 sort_needed_sec
= &shdr
[w2(sort_needed_sym
->st_shndx
)];
157 sort_done_location
= (void *)ehdr
+
158 _w(sort_needed_sec
->sh_offset
) +
159 _w(sort_needed_sym
->st_value
) -
160 _w(sort_needed_sec
->sh_addr
);
162 printf("sort done marker at %lx\n",
163 (unsigned long) (_w(sort_needed_sec
->sh_offset
) +
164 _w(sort_needed_sym
->st_value
) -
165 _w(sort_needed_sec
->sh_addr
)));
166 /* We sorted it, clear the flag. */
167 *sort_done_location
= 0;
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