Mercurial > hg > truffle
annotate agent/src/os/linux/salibelf.c @ 19033:74b144f7c54a
Merge.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Wed, 28 Jan 2015 19:32:47 +0100 |
parents | 89152779163c |
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rev | line source |
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0 | 1 /* |
17524 | 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 #include "salibelf.h" | |
26 #include <stdlib.h> | |
27 #include <unistd.h> | |
12329 | 28 #include <string.h> |
0 | 29 |
30 extern void print_debug(const char*,...); | |
31 | |
32 // ELF file parsing helpers. Note that we do *not* use libelf here. | |
33 int read_elf_header(int fd, ELF_EHDR* ehdr) { | |
34 if (pread(fd, ehdr, sizeof (ELF_EHDR), 0) != sizeof (ELF_EHDR) || | |
35 memcmp(&ehdr->e_ident[EI_MAG0], ELFMAG, SELFMAG) != 0 || | |
36 ehdr->e_version != EV_CURRENT) { | |
37 return 0; | |
38 } | |
39 return 1; | |
40 } | |
41 | |
42 bool is_elf_file(int fd) { | |
43 ELF_EHDR ehdr; | |
44 return read_elf_header(fd, &ehdr); | |
45 } | |
46 | |
47 // read program header table of an ELF file | |
48 ELF_PHDR* read_program_header_table(int fd, ELF_EHDR* hdr) { | |
49 ELF_PHDR* phbuf = 0; | |
50 // allocate memory for program header table | |
51 size_t nbytes = hdr->e_phnum * hdr->e_phentsize; | |
52 | |
53 if ((phbuf = (ELF_PHDR*) malloc(nbytes)) == NULL) { | |
54 print_debug("can't allocate memory for reading program header table\n"); | |
55 return NULL; | |
56 } | |
57 | |
58 if (pread(fd, phbuf, nbytes, hdr->e_phoff) != nbytes) { | |
59 print_debug("ELF file is truncated! can't read program header table\n"); | |
60 free(phbuf); | |
61 return NULL; | |
62 } | |
63 | |
64 return phbuf; | |
65 } | |
66 | |
67 // read section header table of an ELF file | |
68 ELF_SHDR* read_section_header_table(int fd, ELF_EHDR* hdr) { | |
69 ELF_SHDR* shbuf = 0; | |
70 // allocate memory for section header table | |
71 size_t nbytes = hdr->e_shnum * hdr->e_shentsize; | |
72 | |
73 if ((shbuf = (ELF_SHDR*) malloc(nbytes)) == NULL) { | |
74 print_debug("can't allocate memory for reading section header table\n"); | |
75 return NULL; | |
76 } | |
77 | |
78 if (pread(fd, shbuf, nbytes, hdr->e_shoff) != nbytes) { | |
79 print_debug("ELF file is truncated! can't read section header table\n"); | |
80 free(shbuf); | |
81 return NULL; | |
82 } | |
83 | |
84 return shbuf; | |
85 } | |
86 | |
87 // read a particular section's data | |
88 void* read_section_data(int fd, ELF_EHDR* ehdr, ELF_SHDR* shdr) { | |
89 void *buf = NULL; | |
90 if (shdr->sh_type == SHT_NOBITS || shdr->sh_size == 0) { | |
91 return buf; | |
92 } | |
93 if ((buf = calloc(shdr->sh_size, 1)) == NULL) { | |
94 print_debug("can't allocate memory for reading section data\n"); | |
95 return NULL; | |
96 } | |
97 if (pread(fd, buf, shdr->sh_size, shdr->sh_offset) != shdr->sh_size) { | |
98 free(buf); | |
99 print_debug("section data read failed\n"); | |
100 return NULL; | |
101 } | |
102 return buf; | |
103 } | |
104 | |
105 uintptr_t find_base_address(int fd, ELF_EHDR* ehdr) { | |
106 uintptr_t baseaddr = (uintptr_t)-1; | |
107 int cnt; | |
108 ELF_PHDR *phbuf, *phdr; | |
109 | |
110 // read program header table | |
111 if ((phbuf = read_program_header_table(fd, ehdr)) == NULL) { | |
112 goto quit; | |
113 } | |
114 | |
115 // the base address of a shared object is the lowest vaddr of | |
116 // its loadable segments (PT_LOAD) | |
117 for (phdr = phbuf, cnt = 0; cnt < ehdr->e_phnum; cnt++, phdr++) { | |
118 if (phdr->p_type == PT_LOAD && phdr->p_vaddr < baseaddr) { | |
119 baseaddr = phdr->p_vaddr; | |
120 } | |
121 } | |
122 | |
123 quit: | |
124 if (phbuf) free(phbuf); | |
125 return baseaddr; | |
126 } |