1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */
23*0Sstevel@tonic-gate /* All Rights Reserved */
24*0Sstevel@tonic-gate
25*0Sstevel@tonic-gate
26*0Sstevel@tonic-gate /*
27*0Sstevel@tonic-gate * Copyright (c) 1998 by Sun Microsystems, Inc.
28*0Sstevel@tonic-gate * All rights reserved.
29*0Sstevel@tonic-gate */
30*0Sstevel@tonic-gate
31*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.13 */
32*0Sstevel@tonic-gate
33*0Sstevel@tonic-gate #include "libelf.h"
34*0Sstevel@tonic-gate #include <unistd.h>
35*0Sstevel@tonic-gate #include <fcntl.h>
36*0Sstevel@tonic-gate #include <string.h>
37*0Sstevel@tonic-gate #include <nlist.h>
38*0Sstevel@tonic-gate #include <note.h>
39*0Sstevel@tonic-gate #include "syms.h"
40*0Sstevel@tonic-gate #include "gelf.h"
41*0Sstevel@tonic-gate
42*0Sstevel@tonic-gate #undef n_name /* This undef is to handle a #define in syms.h */
43*0Sstevel@tonic-gate /* which conflicts with the member nlist->n_name */
44*0Sstevel@tonic-gate /* as defined in nlist.h */
45*0Sstevel@tonic-gate
46*0Sstevel@tonic-gate
47*0Sstevel@tonic-gate #define SPACE 100 /* number of symbols read at a time */
48*0Sstevel@tonic-gate #define ISELF (strncmp(magic_buf, ELFMAG, SELFMAG) == 0)
49*0Sstevel@tonic-gate
50*0Sstevel@tonic-gate
51*0Sstevel@tonic-gate int
end_elf_job(int fd,Elf * elfdes)52*0Sstevel@tonic-gate end_elf_job(int fd, Elf * elfdes)
53*0Sstevel@tonic-gate {
54*0Sstevel@tonic-gate (void) elf_end(elfdes);
55*0Sstevel@tonic-gate (void) close(fd);
56*0Sstevel@tonic-gate return (-1);
57*0Sstevel@tonic-gate }
58*0Sstevel@tonic-gate
59*0Sstevel@tonic-gate
60*0Sstevel@tonic-gate int
_elf_nlist(int fd,struct nlist * list)61*0Sstevel@tonic-gate _elf_nlist(int fd, struct nlist * list)
62*0Sstevel@tonic-gate {
63*0Sstevel@tonic-gate Elf *elfdes; /* ELF descriptor */
64*0Sstevel@tonic-gate GElf_Ehdr ehdr; /* ELF Ehdr */
65*0Sstevel@tonic-gate GElf_Shdr s_buf; /* buffer storing section header */
66*0Sstevel@tonic-gate Elf_Data *symdata; /* buffer points to symbol table */
67*0Sstevel@tonic-gate Elf_Scn *secidx = 0; /* index of the section header table */
68*0Sstevel@tonic-gate GElf_Sym sym; /* buffer storing one symbol information */
69*0Sstevel@tonic-gate unsigned strtab; /* index of symbol name in string table */
70*0Sstevel@tonic-gate long count; /* number of symbols */
71*0Sstevel@tonic-gate long ii; /* loop control */
72*0Sstevel@tonic-gate
73*0Sstevel@tonic-gate if (elf_version(EV_CURRENT) == EV_NONE) {
74*0Sstevel@tonic-gate (void) close(fd);
75*0Sstevel@tonic-gate return (-1);
76*0Sstevel@tonic-gate }
77*0Sstevel@tonic-gate elfdes = elf_begin(fd, ELF_C_READ, (Elf *)0);
78*0Sstevel@tonic-gate if (gelf_getehdr(elfdes, &ehdr) == 0)
79*0Sstevel@tonic-gate return (end_elf_job(fd, elfdes));
80*0Sstevel@tonic-gate
81*0Sstevel@tonic-gate while ((secidx = elf_nextscn(elfdes, secidx)) != 0) {
82*0Sstevel@tonic-gate if ((gelf_getshdr(secidx, &s_buf)) == 0)
83*0Sstevel@tonic-gate return (end_elf_job(fd, elfdes));
84*0Sstevel@tonic-gate if (s_buf.sh_type != SHT_SYMTAB) /* not symbol table */
85*0Sstevel@tonic-gate continue;
86*0Sstevel@tonic-gate symdata = elf_getdata(secidx, (Elf_Data *)0);
87*0Sstevel@tonic-gate if (symdata == 0)
88*0Sstevel@tonic-gate return (end_elf_job(fd, elfdes));
89*0Sstevel@tonic-gate if (symdata->d_size == 0)
90*0Sstevel@tonic-gate break;
91*0Sstevel@tonic-gate strtab = s_buf.sh_link;
92*0Sstevel@tonic-gate count = symdata->d_size / s_buf.sh_entsize;
93*0Sstevel@tonic-gate for (ii = 1; ii < count; ++ii) {
94*0Sstevel@tonic-gate struct nlist *p;
95*0Sstevel@tonic-gate register char *name;
96*0Sstevel@tonic-gate /* LINTED */
97*0Sstevel@tonic-gate (void) gelf_getsym(symdata, (int)ii, &sym);
98*0Sstevel@tonic-gate name = elf_strptr(elfdes, strtab, (size_t)sym.st_name);
99*0Sstevel@tonic-gate if (name == 0)
100*0Sstevel@tonic-gate continue;
101*0Sstevel@tonic-gate for (p = list; p->n_name && p->n_name[0]; ++p) {
102*0Sstevel@tonic-gate if (strcmp(p->n_name, name))
103*0Sstevel@tonic-gate continue;
104*0Sstevel@tonic-gate p->n_value = (long)sym.st_value;
105*0Sstevel@tonic-gate p->n_type = GELF_ST_TYPE(sym.st_info);
106*0Sstevel@tonic-gate p->n_scnum = sym.st_shndx;
107*0Sstevel@tonic-gate break;
108*0Sstevel@tonic-gate }
109*0Sstevel@tonic-gate }
110*0Sstevel@tonic-gate break;
111*0Sstevel@tonic-gate /*
112*0Sstevel@tonic-gate * Currently there is only one symbol table section
113*0Sstevel@tonic-gate * in an object file, but this restriction may be
114*0Sstevel@tonic-gate * relaxed in the future.
115*0Sstevel@tonic-gate */
116*0Sstevel@tonic-gate }
117*0Sstevel@tonic-gate (void) elf_end(elfdes);
118*0Sstevel@tonic-gate (void) close(fd);
119*0Sstevel@tonic-gate return (0);
120*0Sstevel@tonic-gate }
121*0Sstevel@tonic-gate
122*0Sstevel@tonic-gate
123*0Sstevel@tonic-gate NOTE(SCHEME_PROTECTS_DATA("user provides buffers", nlist))
124*0Sstevel@tonic-gate
125*0Sstevel@tonic-gate int
nlist(const char * name,struct nlist * list)126*0Sstevel@tonic-gate nlist(const char * name, struct nlist * list)
127*0Sstevel@tonic-gate {
128*0Sstevel@tonic-gate register struct nlist *p;
129*0Sstevel@tonic-gate char magic_buf[EI_NIDENT];
130*0Sstevel@tonic-gate int fd;
131*0Sstevel@tonic-gate
132*0Sstevel@tonic-gate for (p = list; p->n_name && p->n_name[0]; p++) { /* n_name can be ptr */
133*0Sstevel@tonic-gate p->n_type = 0;
134*0Sstevel@tonic-gate p->n_value = 0L;
135*0Sstevel@tonic-gate p->n_scnum = 0;
136*0Sstevel@tonic-gate p->n_sclass = 0;
137*0Sstevel@tonic-gate p->n_numaux = 0;
138*0Sstevel@tonic-gate }
139*0Sstevel@tonic-gate
140*0Sstevel@tonic-gate if ((fd = open(name, 0)) < 0)
141*0Sstevel@tonic-gate return (-1);
142*0Sstevel@tonic-gate if (read(fd, magic_buf, EI_NIDENT) == -1) {
143*0Sstevel@tonic-gate (void) close(fd);
144*0Sstevel@tonic-gate return (-1);
145*0Sstevel@tonic-gate }
146*0Sstevel@tonic-gate
147*0Sstevel@tonic-gate if (lseek(fd, 0L, 0) == -1L) { /* rewind to beginning of object file */
148*0Sstevel@tonic-gate (void) close(fd);
149*0Sstevel@tonic-gate return (-1);
150*0Sstevel@tonic-gate }
151*0Sstevel@tonic-gate
152*0Sstevel@tonic-gate #ifndef _LP64
153*0Sstevel@tonic-gate if (ISELF && (magic_buf[EI_CLASS] == ELFCLASS32))
154*0Sstevel@tonic-gate #else
155*0Sstevel@tonic-gate if (ISELF) /* 64-bit case handles both Elf32 and Elf64 */
156*0Sstevel@tonic-gate #endif
157*0Sstevel@tonic-gate return (_elf_nlist(fd, list));
158*0Sstevel@tonic-gate else {
159*0Sstevel@tonic-gate (void) close(fd);
160*0Sstevel@tonic-gate return (-1);
161*0Sstevel@tonic-gate }
162*0Sstevel@tonic-gate }
163