FD.io VPP  v17.07-30-g839fa73
Vector Packet Processing
elf_clib.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /*
16  Copyright (c) 2012 Eliot Dresselhaus
17 
18  Permission is hereby granted, free of charge, to any person obtaining
19  a copy of this software and associated documentation files (the
20  "Software"), to deal in the Software without restriction, including
21  without limitation the rights to use, copy, modify, merge, publish,
22  distribute, sublicense, and/or sell copies of the Software, and to
23  permit persons to whom the Software is furnished to do so, subject to
24  the following conditions:
25 
26  The above copyright notice and this permission notice shall be
27  included in all copies or substantial portions of the Software.
28 
29  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
33  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
34  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
35  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 */
37 
38 #ifndef included_clib_elf_self_h
39 #define included_clib_elf_self_h
40 
41 #include <vppinfra/elf.h>
42 #include <vppinfra/hash.h>
43 
44 #define CLIB_ELF_SECTION_DATA_ALIGN 32
45 
46 #define CLIB_ELF_SECTION_ADD_PREFIX(n) "clib_elf_section_" n
47 
48 /* Attribute used is so that static registrations work even if
49  variable is not referenced. */
50 #define CLIB_ELF_SECTION(SECTION) \
51  __attribute__ ((used, \
52  aligned (CLIB_ELF_SECTION_DATA_ALIGN), \
53  section (CLIB_ELF_SECTION_ADD_PREFIX (SECTION))))
54 
55 /* Given pointer to previous data A get next pointer. EXTRA gives extra
56  space beyond A + 1 used in object. */
57 #define clib_elf_section_data_next(a,extra) \
58  uword_to_pointer (round_pow2 (pointer_to_uword (a + 1) + (extra), \
59  CLIB_ELF_SECTION_DATA_ALIGN), \
60  void *)
61 
62 typedef struct
63 {
64  void *lo, *hi;
66 
67 typedef struct
68 {
69  /* Vector of bounds for this section. Multiple shared objects may have instances
70  of the same sections. */
72 
73  /* Name of ELF section (e.g. .text). */
74  u8 *name;
76 
77 typedef struct
78 {
79  /* Vector of sections. */
81 
82  /* Hash map of name to section index. */
84 
85  /* Unix path that we were exec()ed with. */
86  char *exec_path;
87 
90 
91 always_inline void
93 {
95  vec_foreach (s, m->sections)
96  {
97  vec_free (s->bounds);
98  vec_free (s->name);
99  }
100  vec_free (m->sections);
102 
103  {
104  elf_main_t *em;
105  vec_foreach (em, m->elf_mains)
106  {
107  elf_main_free (em);
108  }
109  vec_free (m->elf_mains);
110  }
111 }
112 
113 /* Call with exec_path equal to argv[0] from C main. */
114 void clib_elf_main_init (char *exec_path);
115 
117 
118 typedef struct
119 {
120  /* The symbol. */
122 
123  /* elf_main_t where symbol came from. */
125 
126  /* Symbol table in elf_main_t where this symbol came from. */
129 
130 /* Returns 1 if found; otherwise zero. */
131 uword clib_elf_symbol_by_name (char *name, clib_elf_symbol_t * result);
133 
135 
136 #endif /* included_clib_elf_self_h */
137 
138 /*
139  * fd.io coding-style-patch-verification: ON
140  *
141  * Local Variables:
142  * eval: (c-set-style "gnu")
143  * End:
144  */
clib_elf_section_t * sections
Definition: elf_clib.h:80
vmrglw vmrglh hi
static void elf_main_free(elf_main_t *em)
Definition: elf.h:926
static void clib_elf_main_free(clib_elf_main_t *m)
Definition: elf_clib.h:92
format_function_t format_clib_elf_symbol
Definition: elf_clib.h:134
u8 *( format_function_t)(u8 *s, va_list *args)
Definition: format.h:48
clib_elf_section_bounds_t * bounds
Definition: elf_clib.h:71
uword clib_elf_symbol_by_address(uword address, clib_elf_symbol_t *result)
Definition: elf_clib.c:323
#define always_inline
Definition: clib.h:84
elf64_symbol_t symbol
Definition: elf_clib.h:121
char * exec_path
Definition: elf_clib.h:86
uword clib_elf_symbol_by_name(char *name, clib_elf_symbol_t *result)
Definition: elf_clib.c:317
#define hash_free(h)
Definition: hash.h:286
uword * section_by_name
Definition: elf_clib.h:83
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:340
elf_main_t * elf_mains
Definition: elf_clib.h:88
unsigned int u32
Definition: types.h:88
void clib_elf_main_init(char *exec_path)
Definition: elf_clib.c:257
u64 uword
Definition: types.h:112
unsigned char u8
Definition: types.h:56
format_function_t format_clib_elf_symbol_with_address
Definition: elf_clib.h:134
clib_elf_section_bounds_t * clib_elf_get_section_bounds(char *name)
Definition: elf_clib.c:267
#define vec_foreach(var, vec)
Vector iterator.
u32 symbol_table_index
Definition: elf_clib.h:127