Mercurial > hg > graal-compiler
annotate agent/src/os/linux/salibelf.c @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
| children | f2512d89ad0c |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2003, 2006, 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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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 #include "salibelf.h" | |
| 26 #include <stdlib.h> | |
| 27 #include <unistd.h> | |
| 28 | |
| 29 extern void print_debug(const char*,...); | |
| 30 | |
| 31 // ELF file parsing helpers. Note that we do *not* use libelf here. | |
| 32 int read_elf_header(int fd, ELF_EHDR* ehdr) { | |
| 33 if (pread(fd, ehdr, sizeof (ELF_EHDR), 0) != sizeof (ELF_EHDR) || | |
| 34 memcmp(&ehdr->e_ident[EI_MAG0], ELFMAG, SELFMAG) != 0 || | |
| 35 ehdr->e_version != EV_CURRENT) { | |
| 36 return 0; | |
| 37 } | |
| 38 return 1; | |
| 39 } | |
| 40 | |
| 41 bool is_elf_file(int fd) { | |
| 42 ELF_EHDR ehdr; | |
| 43 return read_elf_header(fd, &ehdr); | |
| 44 } | |
| 45 | |
| 46 // read program header table of an ELF file | |
| 47 ELF_PHDR* read_program_header_table(int fd, ELF_EHDR* hdr) { | |
| 48 ELF_PHDR* phbuf = 0; | |
| 49 // allocate memory for program header table | |
| 50 size_t nbytes = hdr->e_phnum * hdr->e_phentsize; | |
| 51 | |
| 52 if ((phbuf = (ELF_PHDR*) malloc(nbytes)) == NULL) { | |
| 53 print_debug("can't allocate memory for reading program header table\n"); | |
| 54 return NULL; | |
| 55 } | |
| 56 | |
| 57 if (pread(fd, phbuf, nbytes, hdr->e_phoff) != nbytes) { | |
| 58 print_debug("ELF file is truncated! can't read program header table\n"); | |
| 59 free(phbuf); | |
| 60 return NULL; | |
| 61 } | |
| 62 | |
| 63 return phbuf; | |
| 64 } | |
| 65 | |
| 66 // read section header table of an ELF file | |
| 67 ELF_SHDR* read_section_header_table(int fd, ELF_EHDR* hdr) { | |
| 68 ELF_SHDR* shbuf = 0; | |
| 69 // allocate memory for section header table | |
| 70 size_t nbytes = hdr->e_shnum * hdr->e_shentsize; | |
| 71 | |
| 72 if ((shbuf = (ELF_SHDR*) malloc(nbytes)) == NULL) { | |
| 73 print_debug("can't allocate memory for reading section header table\n"); | |
| 74 return NULL; | |
| 75 } | |
| 76 | |
| 77 if (pread(fd, shbuf, nbytes, hdr->e_shoff) != nbytes) { | |
| 78 print_debug("ELF file is truncated! can't read section header table\n"); | |
| 79 free(shbuf); | |
| 80 return NULL; | |
| 81 } | |
| 82 | |
| 83 return shbuf; | |
| 84 } | |
| 85 | |
| 86 // read a particular section's data | |
| 87 void* read_section_data(int fd, ELF_EHDR* ehdr, ELF_SHDR* shdr) { | |
| 88 void *buf = NULL; | |
| 89 if (shdr->sh_type == SHT_NOBITS || shdr->sh_size == 0) { | |
| 90 return buf; | |
| 91 } | |
| 92 if ((buf = calloc(shdr->sh_size, 1)) == NULL) { | |
| 93 print_debug("can't allocate memory for reading section data\n"); | |
| 94 return NULL; | |
| 95 } | |
| 96 if (pread(fd, buf, shdr->sh_size, shdr->sh_offset) != shdr->sh_size) { | |
| 97 free(buf); | |
| 98 print_debug("section data read failed\n"); | |
| 99 return NULL; | |
| 100 } | |
| 101 return buf; | |
| 102 } | |
| 103 | |
| 104 uintptr_t find_base_address(int fd, ELF_EHDR* ehdr) { | |
| 105 uintptr_t baseaddr = (uintptr_t)-1; | |
| 106 int cnt; | |
| 107 ELF_PHDR *phbuf, *phdr; | |
| 108 | |
| 109 // read program header table | |
| 110 if ((phbuf = read_program_header_table(fd, ehdr)) == NULL) { | |
| 111 goto quit; | |
| 112 } | |
| 113 | |
| 114 // the base address of a shared object is the lowest vaddr of | |
| 115 // its loadable segments (PT_LOAD) | |
| 116 for (phdr = phbuf, cnt = 0; cnt < ehdr->e_phnum; cnt++, phdr++) { | |
| 117 if (phdr->p_type == PT_LOAD && phdr->p_vaddr < baseaddr) { | |
| 118 baseaddr = phdr->p_vaddr; | |
| 119 } | |
| 120 } | |
| 121 | |
| 122 quit: | |
| 123 if (phbuf) free(phbuf); | |
| 124 return baseaddr; | |
| 125 } |