Mercurial > hg > truffle
annotate agent/src/os/linux/salibelf.c @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
|---|---|
| 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 } |