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agent/src/os/bsd/salibelf.c@dbb05f6d93c4 (annotated)

agent/src/os/bsd/salibelf.c

Mon, 28 Jul 2014 15:06:38 -0700

author

fzhinkin

date

Mon, 28 Jul 2014 15:06:38 -0700

changeset 6997

dbb05f6d93c4

parent 0

f90c822e73f8

permissions

-rw-r--r--

8051344: JVM crashed in Compile::start() during method parsing w/ UseRTMDeopt turned on
Summary: call rtm_deopt() only if there were no compilation bailouts before.
Reviewed-by: kvn

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "salibelf.h"
aoqi@0	26	#include <stdlib.h>
aoqi@0	27	#include <unistd.h>
aoqi@0	28	#include <string.h>
aoqi@0	29
aoqi@0	30	extern void print_debug(const char*,...);
aoqi@0	31
aoqi@0	32	// ELF file parsing helpers. Note that we do *not* use libelf here.
aoqi@0	33	int read_elf_header(int fd, ELF_EHDR* ehdr) {
aoqi@0	34	if (pread(fd, ehdr, sizeof (ELF_EHDR), 0) != sizeof (ELF_EHDR) ||
aoqi@0	35	memcmp(&ehdr->e_ident[EI_MAG0], ELFMAG, SELFMAG) != 0 ||
aoqi@0	36	ehdr->e_version != EV_CURRENT) {
aoqi@0	37	return 0;
aoqi@0	38	}
aoqi@0	39	return 1;
aoqi@0	40	}
aoqi@0	41
aoqi@0	42	bool is_elf_file(int fd) {
aoqi@0	43	ELF_EHDR ehdr;
aoqi@0	44	return read_elf_header(fd, &ehdr);
aoqi@0	45	}
aoqi@0	46
aoqi@0	47	// read program header table of an ELF file
aoqi@0	48	ELF_PHDR* read_program_header_table(int fd, ELF_EHDR* hdr) {
aoqi@0	49	ELF_PHDR* phbuf = 0;
aoqi@0	50	// allocate memory for program header table
aoqi@0	51	size_t nbytes = hdr->e_phnum * hdr->e_phentsize;
aoqi@0	52
aoqi@0	53	if ((phbuf = (ELF_PHDR*) malloc(nbytes)) == NULL) {
aoqi@0	54	print_debug("can't allocate memory for reading program header table\n");
aoqi@0	55	return NULL;
aoqi@0	56	}
aoqi@0	57
aoqi@0	58	if (pread(fd, phbuf, nbytes, hdr->e_phoff) != nbytes) {
aoqi@0	59	print_debug("ELF file is truncated! can't read program header table\n");
aoqi@0	60	free(phbuf);
aoqi@0	61	return NULL;
aoqi@0	62	}
aoqi@0	63
aoqi@0	64	return phbuf;
aoqi@0	65	}
aoqi@0	66
aoqi@0	67	// read section header table of an ELF file
aoqi@0	68	ELF_SHDR* read_section_header_table(int fd, ELF_EHDR* hdr) {
aoqi@0	69	ELF_SHDR* shbuf = 0;
aoqi@0	70	// allocate memory for section header table
aoqi@0	71	size_t nbytes = hdr->e_shnum * hdr->e_shentsize;
aoqi@0	72
aoqi@0	73	if ((shbuf = (ELF_SHDR*) malloc(nbytes)) == NULL) {
aoqi@0	74	print_debug("can't allocate memory for reading section header table\n");
aoqi@0	75	return NULL;
aoqi@0	76	}
aoqi@0	77
aoqi@0	78	if (pread(fd, shbuf, nbytes, hdr->e_shoff) != nbytes) {
aoqi@0	79	print_debug("ELF file is truncated! can't read section header table\n");
aoqi@0	80	free(shbuf);
aoqi@0	81	return NULL;
aoqi@0	82	}
aoqi@0	83
aoqi@0	84	return shbuf;
aoqi@0	85	}
aoqi@0	86
aoqi@0	87	// read a particular section's data
aoqi@0	88	void* read_section_data(int fd, ELF_EHDR* ehdr, ELF_SHDR* shdr) {
aoqi@0	89	void *buf = NULL;
aoqi@0	90	if (shdr->sh_type == SHT_NOBITS || shdr->sh_size == 0) {
aoqi@0	91	return buf;
aoqi@0	92	}
aoqi@0	93	if ((buf = calloc(shdr->sh_size, 1)) == NULL) {
aoqi@0	94	print_debug("can't allocate memory for reading section data\n");
aoqi@0	95	return NULL;
aoqi@0	96	}
aoqi@0	97	if (pread(fd, buf, shdr->sh_size, shdr->sh_offset) != shdr->sh_size) {
aoqi@0	98	free(buf);
aoqi@0	99	print_debug("section data read failed\n");
aoqi@0	100	return NULL;
aoqi@0	101	}
aoqi@0	102	return buf;
aoqi@0	103	}
aoqi@0	104
aoqi@0	105	uintptr_t find_base_address(int fd, ELF_EHDR* ehdr) {
aoqi@0	106	uintptr_t baseaddr = (uintptr_t)-1;
aoqi@0	107	int cnt;
aoqi@0	108	ELF_PHDR *phbuf, *phdr;
aoqi@0	109
aoqi@0	110	// read program header table
aoqi@0	111	if ((phbuf = read_program_header_table(fd, ehdr)) == NULL) {
aoqi@0	112	goto quit;
aoqi@0	113	}
aoqi@0	114
aoqi@0	115	// the base address of a shared object is the lowest vaddr of
aoqi@0	116	// its loadable segments (PT_LOAD)
aoqi@0	117	for (phdr = phbuf, cnt = 0; cnt < ehdr->e_phnum; cnt++, phdr++) {
aoqi@0	118	if (phdr->p_type == PT_LOAD && phdr->p_vaddr < baseaddr) {
aoqi@0	119	baseaddr = phdr->p_vaddr;
aoqi@0	120	}
aoqi@0	121	}
aoqi@0	122
aoqi@0	123	quit:
aoqi@0	124	if (phbuf) free(phbuf);
aoqi@0	125	return baseaddr;
aoqi@0	126	}