Branch data Line data Source code
1 : : /* AArch64 specific symbolic name handling.
2 : : Copyright (C) 2013, 2015, 2017 Red Hat, Inc.
3 : : This file is part of elfutils.
4 : :
5 : : This file is free software; you can redistribute it and/or modify
6 : : it under the terms of either
7 : :
8 : : * the GNU Lesser General Public License as published by the Free
9 : : Software Foundation; either version 3 of the License, or (at
10 : : your option) any later version
11 : :
12 : : or
13 : :
14 : : * the GNU General Public License as published by the Free
15 : : Software Foundation; either version 2 of the License, or (at
16 : : your option) any later version
17 : :
18 : : or both in parallel, as here.
19 : :
20 : : elfutils is distributed in the hope that it will be useful, but
21 : : WITHOUT ANY WARRANTY; without even the implied warranty of
22 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 : : General Public License for more details.
24 : :
25 : : You should have received copies of the GNU General Public License and
26 : : the GNU Lesser General Public License along with this program. If
27 : : not, see <http://www.gnu.org/licenses/>. */
28 : :
29 : : #ifdef HAVE_CONFIG_H
30 : : # include <config.h>
31 : : #endif
32 : :
33 : : #include <system.h>
34 : :
35 : : #include <elf.h>
36 : : #include <stddef.h>
37 : : #include <string.h>
38 : :
39 : : #define BACKEND aarch64_
40 : : #include "libebl_CPU.h"
41 : :
42 : :
43 : : /* Check for the simple reloc types. */
44 : : Elf_Type
45 : 4384 : aarch64_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
46 : : int *addsub __attribute__ ((unused)))
47 : : {
48 [ + + ]: 4384 : switch (type)
49 : : {
50 : : case R_AARCH64_ABS64:
51 : : return ELF_T_XWORD;
52 : : case R_AARCH64_ABS32:
53 : : return ELF_T_WORD;
54 : : case R_AARCH64_ABS16:
55 : : return ELF_T_HALF;
56 : :
57 : : default:
58 : : return ELF_T_NUM;
59 : : }
60 : : }
61 : :
62 : : /* If this is the _GLOBAL_OFFSET_TABLE_ symbol, then it should point in
63 : : the .got even if there is a .got.plt section.
64 : : https://sourceware.org/ml/libc-ports/2013-06/msg00057.html
65 : : https://bugzilla.redhat.com/show_bug.cgi?id=1201778
66 : : */
67 : : bool
68 : 0 : aarch64_check_special_symbol (Elf *elf, const GElf_Sym *sym,
69 : : const char *name, const GElf_Shdr *destshdr)
70 : : {
71 [ # # ]: 0 : if (name != NULL
72 [ # # ]: 0 : && strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
73 : : {
74 : 0 : size_t shstrndx;
75 [ # # ]: 0 : if (elf_getshdrstrndx (elf, &shstrndx) != 0)
76 : 0 : return false;
77 : 0 : const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name);
78 [ # # ]: 0 : if (sname != NULL
79 [ # # # # ]: 0 : && (strcmp (sname, ".got") == 0 || strcmp (sname, ".got.plt") == 0))
80 : : {
81 : : Elf_Scn *scn = NULL;
82 [ # # ]: 0 : while ((scn = elf_nextscn (elf, scn)) != NULL)
83 : : {
84 : 0 : GElf_Shdr shdr_mem;
85 : 0 : GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
86 [ # # ]: 0 : if (shdr != NULL)
87 : : {
88 : 0 : sname = elf_strptr (elf, shstrndx, shdr->sh_name);
89 [ # # # # ]: 0 : if (sname != NULL && strcmp (sname, ".got") == 0)
90 : 0 : return (sym->st_value >= shdr->sh_addr
91 [ # # # # ]: 0 : && sym->st_value < shdr->sh_addr + shdr->sh_size);
92 : : }
93 : : }
94 : : }
95 : : }
96 : :
97 : : return false;
98 : : }
99 : :
100 : : /* A data mapping symbol is a symbol with "$d" name or "$d.<any...>" name,
101 : : STT_NOTYPE, STB_LOCAL and st_size of zero. The indicate the stat of a
102 : : sequence of data items. */
103 : : bool
104 : 8 : aarch64_data_marker_symbol (const GElf_Sym *sym, const char *sname)
105 : : {
106 : 8 : return (sym != NULL && sname != NULL
107 [ + - + - ]: 8 : && sym->st_size == 0 && GELF_ST_BIND (sym->st_info) == STB_LOCAL
108 [ + - ]: 8 : && GELF_ST_TYPE (sym->st_info) == STT_NOTYPE
109 [ + - - + : 16 : && (strcmp (sname, "$d") == 0 || startswith (sname, "$d.")));
- - ]
110 : : }
111 : :
112 : : const char *
113 : 0 : aarch64_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)),
114 : : size_t len __attribute__ ((unused)))
115 : : {
116 [ # # # # ]: 0 : switch (tag)
117 : : {
118 : : case DT_AARCH64_BTI_PLT:
119 : : return "AARCH64_BTI_PLT";
120 : 0 : case DT_AARCH64_PAC_PLT:
121 : 0 : return "AARCH64_PAC_PLT";
122 : 0 : case DT_AARCH64_VARIANT_PCS:
123 : 0 : return "AARCH64_VARIANT_PCS";
124 : : default:
125 : 0 : break;
126 : : }
127 : 0 : return NULL;
128 : : }
129 : :
130 : : bool
131 : 0 : aarch64_dynamic_tag_check (int64_t tag)
132 : : {
133 : 0 : return (tag == DT_AARCH64_BTI_PLT
134 [ # # ]: 0 : || tag == DT_AARCH64_PAC_PLT
135 : 0 : || tag == DT_AARCH64_VARIANT_PCS);
136 : : }
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