1192867Ssson/* 2192867Ssson * CDDL HEADER START 3192867Ssson * 4192867Ssson * The contents of this file are subject to the terms of the 5192867Ssson * Common Development and Distribution License, Version 1.0 only 6192867Ssson * (the "License"). You may not use this file except in compliance 7192867Ssson * with the License. 8192867Ssson * 9192867Ssson * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10192867Ssson * or http://www.opensolaris.org/os/licensing. 11192867Ssson * See the License for the specific language governing permissions 12192867Ssson * and limitations under the License. 13192867Ssson * 14192867Ssson * When distributing Covered Code, include this CDDL HEADER in each 15192867Ssson * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16192867Ssson * If applicable, add the following below this CDDL HEADER, with the 17192867Ssson * fields enclosed by brackets "[]" replaced with your own identifying 18192867Ssson * information: Portions Copyright [yyyy] [name of copyright owner] 19192867Ssson * 20192867Ssson * CDDL HEADER END 21192867Ssson */ 22192867Ssson/* 23192867Ssson * Copyright (c) 1997-1999 by Sun Microsystems, Inc. 24192867Ssson * All rights reserved. 25192867Ssson */ 26192867Ssson 27192867Ssson#pragma ident "%Z%%M% %I% %E% SMI" 28192867Ssson 29192867Ssson#include <stdio.h> 30192867Ssson#include <fcntl.h> 31192867Ssson#include <ctype.h> 32192867Ssson#include <string.h> 33192867Ssson#include <signal.h> 34192867Ssson#include <errno.h> 35192867Ssson#include <stdlib.h> 36192867Ssson#include <stdarg.h> 37192867Ssson#include <unistd.h> 38192867Ssson#include <limits.h> 39192867Ssson#include <sys/types.h> 40192867Ssson#include <sys/stat.h> 41192867Ssson 42192867Ssson#include <libelf.h> 43192867Ssson#include <link.h> 44192867Ssson#include <elf.h> 45297077Smav#ifdef illumos 46192867Ssson#include <sys/machelf.h> 47192867Ssson 48192867Ssson#include <kstat.h> 49192867Ssson#else 50192867Ssson#include <sys/elf.h> 51192867Ssson#include <sys/ksyms.h> 52192867Ssson#endif 53192867Ssson#include <sys/cpuvar.h> 54192867Ssson 55192867Sssontypedef struct syment { 56192867Ssson uintptr_t addr; 57192867Ssson char *name; 58192867Ssson size_t size; 59192867Ssson} syment_t; 60192867Ssson 61192867Sssonstatic syment_t *symbol_table; 62192867Sssonstatic int nsyms, maxsyms; 63192867Sssonstatic char maxsymname[64]; 64192867Ssson 65297077Smav#ifdef illumos 66192867Ssson#ifdef _ELF64 67192867Ssson#define elf_getshdr elf64_getshdr 68192867Ssson#else 69192867Ssson#define elf_getshdr elf32_getshdr 70192867Ssson#endif 71192867Ssson#endif 72192867Ssson 73192867Sssonstatic void 74192867Sssonadd_symbol(char *name, uintptr_t addr, size_t size) 75192867Ssson{ 76192867Ssson syment_t *sep; 77192867Ssson 78192867Ssson if (nsyms >= maxsyms) { 79192867Ssson maxsyms += 10000; 80192867Ssson symbol_table = realloc(symbol_table, maxsyms * sizeof (*sep)); 81192867Ssson if (symbol_table == NULL) { 82192867Ssson (void) fprintf(stderr, "can't allocate symbol table\n"); 83192867Ssson exit(3); 84192867Ssson } 85192867Ssson } 86192867Ssson sep = &symbol_table[nsyms++]; 87192867Ssson 88192867Ssson sep->name = name; 89192867Ssson sep->addr = addr; 90192867Ssson sep->size = size; 91192867Ssson} 92192867Ssson 93192867Sssonstatic void 94192867Sssonremove_symbol(uintptr_t addr) 95192867Ssson{ 96192867Ssson int i; 97192867Ssson syment_t *sep = symbol_table; 98192867Ssson 99192867Ssson for (i = 0; i < nsyms; i++, sep++) 100192867Ssson if (sep->addr == addr) 101192867Ssson sep->addr = 0; 102192867Ssson} 103192867Ssson 104297077Smav#ifdef illumos 105192867Sssonstatic void 106192867Sssonfake_up_certain_popular_kernel_symbols(void) 107192867Ssson{ 108192867Ssson kstat_ctl_t *kc; 109192867Ssson kstat_t *ksp; 110192867Ssson char *name; 111192867Ssson 112192867Ssson if ((kc = kstat_open()) == NULL) 113192867Ssson return; 114192867Ssson 115192867Ssson for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) { 116192867Ssson if (strcmp(ksp->ks_module, "cpu_info") == 0) { 117192867Ssson if ((name = malloc(20)) == NULL) 118192867Ssson break; 119192867Ssson /* 120192867Ssson * For consistency, keep cpu[0] and toss cpu0 121192867Ssson * or any other such symbols. 122192867Ssson */ 123192867Ssson if (ksp->ks_instance == 0) 124192867Ssson remove_symbol((uintptr_t)ksp->ks_private); 125192867Ssson (void) sprintf(name, "cpu[%d]", ksp->ks_instance); 126192867Ssson add_symbol(name, (uintptr_t)ksp->ks_private, 127192867Ssson sizeof (struct cpu)); 128192867Ssson } 129192867Ssson } 130192867Ssson (void) kstat_close(kc); 131192867Ssson} 132297077Smav#else /* !illumos */ 133192867Sssonstatic void 134192867Sssonfake_up_certain_popular_kernel_symbols(void) 135192867Ssson{ 136192867Ssson char *name; 137192867Ssson uintptr_t addr; 138192867Ssson int i; 139192867Ssson 140192867Ssson /* Good for up to 256 CPUs */ 141192867Ssson for(i=0; i < 256; i++) { 142192867Ssson if ((name = malloc(20)) == NULL) 143192867Ssson break; 144192867Ssson (void) sprintf(name, "cpu[%d]", i); 145192867Ssson addr = 0x01000000 + (i << 16); 146192867Ssson add_symbol(name, addr, sizeof (uintptr_t)); 147192867Ssson } 148192867Ssson} 149297077Smav#endif /* illumos */ 150192867Ssson 151192867Sssonstatic int 152192867Sssonsymcmp(const void *p1, const void *p2) 153192867Ssson{ 154192867Ssson uintptr_t a1 = ((syment_t *)p1)->addr; 155192867Ssson uintptr_t a2 = ((syment_t *)p2)->addr; 156192867Ssson 157192867Ssson if (a1 < a2) 158192867Ssson return (-1); 159192867Ssson if (a1 > a2) 160192867Ssson return (1); 161192867Ssson return (0); 162192867Ssson} 163192867Ssson 164192867Sssonint 165192867Sssonsymtab_init(void) 166192867Ssson{ 167192867Ssson Elf *elf; 168192867Ssson Elf_Scn *scn = NULL; 169192867Ssson Sym *symtab, *symp, *lastsym; 170192867Ssson char *strtab; 171192867Ssson uint_t cnt; 172192867Ssson int fd; 173192867Ssson int i; 174192867Ssson int strindex = -1; 175297077Smav#ifndef illumos 176192867Ssson void *ksyms; 177192867Ssson size_t sz; 178192867Ssson#endif 179192867Ssson 180192867Ssson if ((fd = open("/dev/ksyms", O_RDONLY)) == -1) 181192867Ssson return (-1); 182192867Ssson 183297077Smav#ifdef illumos 184192867Ssson (void) elf_version(EV_CURRENT); 185192867Ssson 186192867Ssson elf = elf_begin(fd, ELF_C_READ, NULL); 187192867Ssson#else 188192867Ssson /* 189192867Ssson * XXX - libelf needs to be fixed so it will work with 190192867Ssson * non 'ordinary' files like /dev/ksyms. The following 191192867Ssson * is a work around for now. 192192867Ssson */ 193192867Ssson if (elf_version(EV_CURRENT) == EV_NONE) { 194192867Ssson close(fd); 195192867Ssson return (-1); 196192867Ssson } 197192867Ssson if (ioctl(fd, KIOCGSIZE, &sz) < 0) { 198192867Ssson close(fd); 199192867Ssson return (-1); 200192867Ssson } 201192867Ssson if (ioctl(fd, KIOCGADDR, &ksyms) < 0) { 202192867Ssson close(fd); 203192867Ssson return (-1); 204192867Ssson } 205192867Ssson if ((elf = elf_memory(ksyms, sz)) == NULL) { 206192867Ssson close(fd); 207192867Ssson return (-1); 208192867Ssson } 209192867Ssson#endif 210192867Ssson 211192867Ssson for (cnt = 1; (scn = elf_nextscn(elf, scn)) != NULL; cnt++) { 212192867Ssson Shdr *shdr = elf_getshdr(scn); 213192867Ssson if (shdr->sh_type == SHT_SYMTAB) { 214192867Ssson symtab = (Sym *)elf_getdata(scn, NULL)->d_buf; 215192867Ssson nsyms = shdr->sh_size / shdr->sh_entsize; 216192867Ssson strindex = shdr->sh_link; 217192867Ssson } 218192867Ssson } 219192867Ssson 220192867Ssson for (cnt = 1; (scn = elf_nextscn(elf, scn)) != NULL; cnt++) { 221192867Ssson if (cnt == strindex) 222192867Ssson strtab = (char *)elf_getdata(scn, NULL)->d_buf; 223192867Ssson } 224192867Ssson 225192867Ssson lastsym = symtab + nsyms; 226192867Ssson nsyms = 0; 227192867Ssson for (symp = symtab; symp < lastsym; symp++) 228192867Ssson if ((uint_t)ELF32_ST_TYPE(symp->st_info) <= STT_FUNC && 229192867Ssson symp->st_size != 0) 230192867Ssson add_symbol(symp->st_name + strtab, 231192867Ssson (uintptr_t)symp->st_value, (size_t)symp->st_size); 232192867Ssson 233192867Ssson fake_up_certain_popular_kernel_symbols(); 234192867Ssson (void) sprintf(maxsymname, "0x%lx", ULONG_MAX); 235192867Ssson add_symbol(maxsymname, ULONG_MAX, 1); 236192867Ssson 237192867Ssson qsort(symbol_table, nsyms, sizeof (syment_t), symcmp); 238192867Ssson 239192867Ssson /* 240192867Ssson * Destroy all duplicate symbols, then sort it again. 241192867Ssson */ 242192867Ssson for (i = 0; i < nsyms - 1; i++) 243192867Ssson if (symbol_table[i].addr == symbol_table[i + 1].addr) 244192867Ssson symbol_table[i].addr = 0; 245192867Ssson 246192867Ssson qsort(symbol_table, nsyms, sizeof (syment_t), symcmp); 247192867Ssson 248192867Ssson while (symbol_table[1].addr == 0) { 249192867Ssson symbol_table++; 250192867Ssson nsyms--; 251192867Ssson } 252192867Ssson symbol_table[0].name = "(usermode)"; 253192867Ssson symbol_table[0].addr = 0; 254192867Ssson symbol_table[0].size = 1; 255192867Ssson 256192867Ssson close(fd); 257192867Ssson return (0); 258192867Ssson} 259192867Ssson 260192867Sssonchar * 261192867Sssonaddr_to_sym(uintptr_t addr, uintptr_t *offset, size_t *sizep) 262192867Ssson{ 263192867Ssson int lo = 0; 264192867Ssson int hi = nsyms - 1; 265192867Ssson int mid; 266192867Ssson syment_t *sep; 267192867Ssson 268192867Ssson while (hi - lo > 1) { 269192867Ssson mid = (lo + hi) / 2; 270192867Ssson if (addr >= symbol_table[mid].addr) { 271192867Ssson lo = mid; 272192867Ssson } else { 273192867Ssson hi = mid; 274192867Ssson } 275192867Ssson } 276192867Ssson sep = &symbol_table[lo]; 277192867Ssson *offset = addr - sep->addr; 278192867Ssson *sizep = sep->size; 279192867Ssson return (sep->name); 280192867Ssson} 281192867Ssson 282192867Sssonuintptr_t 283192867Sssonsym_to_addr(char *name) 284192867Ssson{ 285192867Ssson int i; 286192867Ssson syment_t *sep = symbol_table; 287192867Ssson 288192867Ssson for (i = 0; i < nsyms; i++) { 289192867Ssson if (strcmp(name, sep->name) == 0) 290192867Ssson return (sep->addr); 291192867Ssson sep++; 292192867Ssson } 293192867Ssson return (0); 294192867Ssson} 295192867Ssson 296192867Sssonsize_t 297192867Sssonsym_size(char *name) 298192867Ssson{ 299192867Ssson int i; 300192867Ssson syment_t *sep = symbol_table; 301192867Ssson 302192867Ssson for (i = 0; i < nsyms; i++) { 303192867Ssson if (strcmp(name, sep->name) == 0) 304192867Ssson return (sep->size); 305192867Ssson sep++; 306192867Ssson } 307192867Ssson return (0); 308192867Ssson} 309