1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25 #include <stdio.h>
26 #include <fcntl.h>
27 #include <link.h>
28 #include <stdlib.h>
29 #include <unistd.h>
30 #include <strings.h>
31 #include <sys/regset.h>
32 #include <sys/frame.h>
33 #include <sys/stack.h>
34 #include <signal.h>
35
36 #include "env.h"
37 #include "mach.h"
38 #include "who.h"
39
40
41 static int detail_syms = 0; /* display detail symbol information */
42 static Objinfo *objhead = NULL; /* head of object list */
43 static Elist *funclist = NULL;
44 static sigset_t iset;
45
46 static void
add_object(Objinfo ** objlist,Link_map * lmp)47 add_object(Objinfo **objlist, Link_map *lmp)
48 {
49 Objinfo *op, *cur, *prev;
50 Elf_Ehdr *ehdr;
51 Elf_Phdr *phdr;
52 caddr_t lpc, hpc;
53 int i;
54
55 if ((op = calloc(1, sizeof (Objinfo))) == NULL) {
56 (void) fprintf(stderr, "who.so.1: calloc failed\n");
57 exit(1);
58 }
59
60 lpc = hpc = (caddr_t)lmp->l_addr;
61 /* LINTED */
62 ehdr = (Elf_Ehdr *)lpc;
63
64 /* LINTED */
65 for (i = 0, phdr = (Elf_Phdr *)(ehdr->e_phoff + lpc);
66 i < ehdr->e_phnum; i++, phdr++) {
67 caddr_t _hpc;
68 if ((phdr->p_type == PT_LOAD) &&
69 ((_hpc = phdr->p_vaddr + phdr->p_memsz + lpc) > hpc))
70 hpc = _hpc;
71 }
72 op->o_lpc = lpc;
73 op->o_hpc = hpc;
74 op->o_lmp = lmp;
75
76 if (ehdr->e_type == ET_EXEC)
77 op->o_flags |= FLG_OB_FIXED;
78
79 if (*objlist == NULL) {
80 *objlist = op;
81 return;
82 }
83 /*
84 * Do an insertion sort to maintain the list
85 * in order.
86 */
87 if ((*objlist)->o_lmp->l_addr > lmp->l_addr) {
88 op->o_next = *objlist;
89 *objlist = op;
90 return;
91 }
92
93 for (prev = NULL, cur = *objlist; cur; prev = cur, cur = cur->o_next) {
94 if (lpc < cur->o_lpc)
95 break;
96 }
97 if (prev == NULL) {
98 op->o_next = *objlist;
99 *objlist = op;
100 return;
101 }
102 prev->o_next = op;
103 op->o_next = cur;
104 }
105
106 static void
remove_object(Objinfo ** objlist,Link_map * lmp)107 remove_object(Objinfo **objlist, Link_map *lmp)
108 {
109 Objinfo *cur, *prev;
110
111 for (prev = NULL, cur = *objlist; cur; prev = cur, cur = cur->o_next) {
112 if (cur->o_lmp == lmp)
113 break;
114 }
115
116 /*
117 * Did we find it?
118 */
119 if (!cur)
120 return;
121
122 if (!prev)
123 *objlist = cur->o_next;
124 else
125 prev->o_next = cur->o_next;
126
127 if (cur->o_elf) {
128 (void) elf_end(cur->o_elf);
129 (void) close(cur->o_fd);
130 }
131 free(cur);
132 }
133
134 static void
print_simple_address(void * pc)135 print_simple_address(void *pc)
136 {
137 Dl_info info;
138
139 if (dladdr(pc, &info) == 0) {
140 (void) fprintf(stderr,
141 "\t<unknown>: 0x%lx\n", (unsigned long)pc);
142 return;
143 }
144
145 (void) fprintf(stderr, "\t%s:%s+0x%lx\n", info.dli_fname,
146 info.dli_sname,
147 (ulong_t)((uintptr_t)pc - (uintptr_t)info.dli_saddr));
148 }
149
150 static void
load_syms(Objinfo * op)151 load_syms(Objinfo *op)
152 {
153 int fd;
154 Elf *elf;
155 Elf_Scn *scn;
156
157 if (elf_version(EV_CURRENT) == EV_NONE) {
158 op->o_flags |= FLG_OB_NOSYMS;
159 return;
160 }
161
162 if ((fd = open(op->o_lmp->l_name, O_RDONLY)) == -1) {
163 op->o_flags |= FLG_OB_NOSYMS;
164 return;
165 }
166
167 if ((elf = elf_begin(fd, ELF_C_READ, 0)) == NULL) {
168 op->o_flags |= FLG_OB_NOSYMS;
169 (void) close(fd);
170 return;
171 }
172 scn = NULL;
173 while ((scn = elf_nextscn(elf, scn)) != NULL) {
174 Elf_Shdr *shdr;
175 Elf_Data *data;
176
177 shdr = elf_getshdr(scn);
178 if (shdr->sh_type != SHT_SYMTAB)
179 continue;
180 data = elf_getdata(scn, 0);
181 op->o_syms = (Elf_Sym *)data->d_buf;
182 /* LINTED */
183 op->o_symcnt = (uint_t)(shdr->sh_size / shdr->sh_entsize);
184 scn = elf_getscn(elf, shdr->sh_link);
185 data = elf_getdata(scn, 0);
186 op->o_strs = (const char *)data->d_buf;
187 }
188 if (!op->o_syms) {
189 (void) elf_end(elf);
190 (void) close(fd);
191 op->o_flags |= FLG_OB_NOSYMS;
192 }
193 }
194
195
196 static void
print_address(caddr_t pc)197 print_address(caddr_t pc)
198 {
199 Elf_Sym *sym, *_sym;
200 Objinfo *op;
201 int i;
202
203 if (!detail_syms) {
204 print_simple_address(pc);
205 return;
206 }
207 for (op = objhead; op; op = op->o_next) {
208 if ((pc >= op->o_lpc) && (pc <= op->o_hpc))
209 break;
210 }
211 if (op && (op->o_syms == NULL))
212 load_syms(op);
213
214 if (!op || (op->o_flags & FLG_OB_NOSYMS)) {
215 print_simple_address(pc);
216 return;
217 }
218
219 sym = op->o_syms;
220 if ((op->o_flags & FLG_OB_FIXED) == 0)
221 pc = (caddr_t)((uintptr_t)pc - (uintptr_t)op->o_lpc);
222 for (i = 0, _sym = op->o_syms; i < op->o_symcnt; i++, _sym++) {
223 if (((uintptr_t)_sym->st_value < (uintptr_t)pc) &&
224 (_sym->st_value > sym->st_value))
225 sym = _sym;
226 }
227 (void) fprintf(stderr, "\t%s:%s+0x%lx\n", op->o_lmp->l_name,
228 sym->st_name + op->o_strs,
229 (ulong_t)((uintptr_t)pc - (uintptr_t)sym->st_value));
230 }
231
232 static void
print_stack(struct frame * sp)233 print_stack(struct frame *sp)
234 {
235 FLUSHWIN();
236
237 while (sp && sp->fr_savpc) {
238 print_address((caddr_t)sp->fr_savpc);
239 sp = (struct frame *)((ulong_t)sp->fr_savfp + STACK_BIAS);
240 }
241 }
242
243 uint_t
la_version(uint_t version)244 la_version(uint_t version)
245 {
246 if (version > LAV_CURRENT)
247 (void) fprintf(stderr, "who.so: unexpected version: %d\n",
248 version);
249
250 if (checkenv((const char *)"WHO_DETAIL"))
251 detail_syms++;
252
253 build_env_list(&funclist, (const char *)"WHOCALLS");
254
255 /*
256 * Initalize iset to the full set of signals to be masked durring
257 * pltenter/pltexit
258 */
259 (void) sigfillset(&iset);
260
261 return (LAV_CURRENT);
262 }
263
264 /* ARGSUSED1 */
265 uint_t
la_objopen(Link_map * lmp,Lmid_t lmid,uintptr_t * cookie)266 la_objopen(Link_map *lmp, Lmid_t lmid, uintptr_t *cookie)
267 {
268 add_object(&objhead, lmp);
269 return (LA_FLG_BINDTO | LA_FLG_BINDFROM);
270 }
271
272 uint_t
la_objclose(uintptr_t * cookie)273 la_objclose(uintptr_t *cookie)
274 {
275 remove_object(&objhead, (Link_map *)(*cookie));
276 return (1);
277 }
278
279 /* ARGSUSED1 */
280 #if defined(__sparcv9)
281 uintptr_t
la_sparcv9_pltenter(Elf64_Sym * symp,uint_t symndx,uintptr_t * refcookie,uintptr_t * defcookie,La_sparcv9_regs * regset,uint_t * sb_flags,const char * sym_name)282 la_sparcv9_pltenter(Elf64_Sym *symp, uint_t symndx, uintptr_t *refcookie,
283 uintptr_t *defcookie, La_sparcv9_regs *regset, uint_t *sb_flags,
284 const char *sym_name)
285 #elif defined(__sparc)
286 uintptr_t
287 la_sparcv8_pltenter(Elf32_Sym *symp, uint_t symndx, uintptr_t *refcookie,
288 uintptr_t *defcookie, La_sparcv8_regs *regset, uint_t *sb_flags)
289 #elif defined(__amd64)
290 uintptr_t
291 la_amd64_pltenter(Elf64_Sym *symp, uint_t symndx, uintptr_t *refcookie,
292 uintptr_t *defcookie, La_amd64_regs *regset, uint_t *sb_flags,
293 const char *sym_name)
294 #elif defined(__i386)
295 uintptr_t
296 la_i86_pltenter(Elf32_Sym *symp, uint_t symndx, uintptr_t *refcooke,
297 uintptr_t *defcook, La_i86_regs *regset, uint_t *sb_flags)
298 #endif
299 {
300 sigset_t oset;
301 #if !defined(_LP64)
302 const char *sym_name = (const char *)symp->st_name;
303 #endif
304
305 (void) sigprocmask(SIG_BLOCK, &iset, &oset);
306 if (check_list(funclist, sym_name)) {
307 struct frame *frame_p;
308
309 (void) fprintf(stderr, "%s(0x%lx, 0x%lx, 0x%lx)\n", sym_name,
310 (long)GETARG0(regset), (long)GETARG1(regset),
311 (long)GETARG2(regset));
312
313 print_address((caddr_t)GETPREVPC(regset));
314
315 frame_p = (struct frame *)((ulong_t)GETFRAME(regset)
316 + STACK_BIAS);
317
318 print_stack(frame_p);
319 (void) fflush(stdout);
320 }
321 (void) sigprocmask(SIG_SETMASK, &oset, NULL);
322 return (symp->st_value);
323 }
324