4 * Copyright 2011 - 2012 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
37 # define extable_ent_size 16
38 # define compare_extable compare_extable_64
40 # define Elf_Addr Elf64_Addr
41 # define Elf_Ehdr Elf64_Ehdr
42 # define Elf_Shdr Elf64_Shdr
43 # define Elf_Rel Elf64_Rel
44 # define Elf_Rela Elf64_Rela
45 # define Elf_Sym Elf64_Sym
46 # define ELF_R_SYM ELF64_R_SYM
47 # define Elf_r_sym Elf64_r_sym
48 # define ELF_R_INFO ELF64_R_INFO
49 # define Elf_r_info Elf64_r_info
50 # define ELF_ST_BIND ELF64_ST_BIND
51 # define ELF_ST_TYPE ELF64_ST_TYPE
52 # define fn_ELF_R_SYM fn_ELF64_R_SYM
53 # define fn_ELF_R_INFO fn_ELF64_R_INFO
54 # define uint_t uint64_t
58 # define extable_ent_size 8
59 # define compare_extable compare_extable_32
61 # define Elf_Addr Elf32_Addr
62 # define Elf_Ehdr Elf32_Ehdr
63 # define Elf_Shdr Elf32_Shdr
64 # define Elf_Rel Elf32_Rel
65 # define Elf_Rela Elf32_Rela
66 # define Elf_Sym Elf32_Sym
67 # define ELF_R_SYM ELF32_R_SYM
68 # define Elf_r_sym Elf32_r_sym
69 # define ELF_R_INFO ELF32_R_INFO
70 # define Elf_r_info Elf32_r_info
71 # define ELF_ST_BIND ELF32_ST_BIND
72 # define ELF_ST_TYPE ELF32_ST_TYPE
73 # define fn_ELF_R_SYM fn_ELF32_R_SYM
74 # define fn_ELF_R_INFO fn_ELF32_R_INFO
75 # define uint_t uint32_t
80 static int compare_extable(const void *a
, const void *b
)
93 do_func(Elf_Ehdr
*ehdr
, char const *const fname
, table_sort_t custom_sort
)
96 Elf_Shdr
*shstrtab_sec
;
97 Elf_Shdr
*strtab_sec
= NULL
;
98 Elf_Shdr
*symtab_sec
= NULL
;
99 Elf_Shdr
*extab_sec
= NULL
;
101 const Elf_Sym
*symtab
;
102 Elf32_Word
*symtab_shndx_start
= NULL
;
103 Elf_Sym
*sort_needed_sym
;
104 Elf_Shdr
*sort_needed_sec
;
105 Elf_Rel
*relocs
= NULL
;
107 uint32_t *sort_done_location
;
108 const char *secstrtab
;
114 unsigned int num_sections
;
115 unsigned int secindex_strings
;
117 shdr
= (Elf_Shdr
*)((char *)ehdr
+ _r(&ehdr
->e_shoff
));
119 num_sections
= r2(&ehdr
->e_shnum
);
120 if (num_sections
== SHN_UNDEF
)
121 num_sections
= _r(&shdr
[0].sh_size
);
123 secindex_strings
= r2(&ehdr
->e_shstrndx
);
124 if (secindex_strings
== SHN_XINDEX
)
125 secindex_strings
= r(&shdr
[0].sh_link
);
127 shstrtab_sec
= shdr
+ secindex_strings
;
128 secstrtab
= (const char *)ehdr
+ _r(&shstrtab_sec
->sh_offset
);
129 for (i
= 0; i
< num_sections
; i
++) {
130 idx
= r(&shdr
[i
].sh_name
);
131 if (strcmp(secstrtab
+ idx
, "__ex_table") == 0) {
132 extab_sec
= shdr
+ i
;
135 if ((r(&shdr
[i
].sh_type
) == SHT_REL
||
136 r(&shdr
[i
].sh_type
) == SHT_RELA
) &&
137 r(&shdr
[i
].sh_info
) == extab_index
) {
138 relocs
= (void *)ehdr
+ _r(&shdr
[i
].sh_offset
);
139 relocs_size
= _r(&shdr
[i
].sh_size
);
141 if (strcmp(secstrtab
+ idx
, ".symtab") == 0)
142 symtab_sec
= shdr
+ i
;
143 if (strcmp(secstrtab
+ idx
, ".strtab") == 0)
144 strtab_sec
= shdr
+ i
;
145 if (r(&shdr
[i
].sh_type
) == SHT_SYMTAB_SHNDX
)
146 symtab_shndx_start
= (Elf32_Word
*)(
147 (const char *)ehdr
+ _r(&shdr
[i
].sh_offset
));
149 if (strtab_sec
== NULL
) {
150 fprintf(stderr
, "no .strtab in file: %s\n", fname
);
153 if (symtab_sec
== NULL
) {
154 fprintf(stderr
, "no .symtab in file: %s\n", fname
);
157 symtab
= (const Elf_Sym
*)((const char *)ehdr
+
158 _r(&symtab_sec
->sh_offset
));
159 if (extab_sec
== NULL
) {
160 fprintf(stderr
, "no __ex_table in file: %s\n", fname
);
163 strtab
= (const char *)ehdr
+ _r(&strtab_sec
->sh_offset
);
165 extab_image
= (void *)ehdr
+ _r(&extab_sec
->sh_offset
);
168 custom_sort(extab_image
, _r(&extab_sec
->sh_size
));
170 int num_entries
= _r(&extab_sec
->sh_size
) / extable_ent_size
;
171 qsort(extab_image
, num_entries
,
172 extable_ent_size
, compare_extable
);
174 /* If there were relocations, we no longer need them. */
176 memset(relocs
, 0, relocs_size
);
178 /* find main_extable_sort_needed */
179 sort_needed_sym
= NULL
;
180 for (i
= 0; i
< _r(&symtab_sec
->sh_size
) / sizeof(Elf_Sym
); i
++) {
181 sym
= (void *)ehdr
+ _r(&symtab_sec
->sh_offset
);
183 if (ELF_ST_TYPE(sym
->st_info
) != STT_OBJECT
)
185 idx
= r(&sym
->st_name
);
186 if (strcmp(strtab
+ idx
, "main_extable_sort_needed") == 0) {
187 sort_needed_sym
= sym
;
191 if (sort_needed_sym
== NULL
) {
193 "no main_extable_sort_needed symbol in file: %s\n",
197 sort_needed_sec
= &shdr
[get_secindex(r2(&sym
->st_shndx
),
198 sort_needed_sym
- symtab
,
199 symtab_shndx_start
)];
200 sort_done_location
= (void *)ehdr
+
201 _r(&sort_needed_sec
->sh_offset
) +
202 _r(&sort_needed_sym
->st_value
) -
203 _r(&sort_needed_sec
->sh_addr
);
206 printf("sort done marker at %lx\n",
207 (unsigned long)((char *)sort_done_location
- (char *)ehdr
));
209 /* We sorted it, clear the flag. */
210 w(0, sort_done_location
);
This page took 0.034301 seconds and 5 git commands to generate.