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> 45192867Ssson#if defined(sun) 46192867Ssson#include <sys/machelf.h> 47192867Ssson 48192867Ssson#include <kstat.h> 49192867Ssson#else 50192867Ssson/* FreeBSD */ 51192867Ssson#include <sys/elf.h> 52192867Ssson#include <sys/ksyms.h> 53192867Ssson#endif 54192867Ssson#include <sys/cpuvar.h> 55192867Ssson 56192867Sssontypedef struct syment { 57192867Ssson uintptr_t addr; 58192867Ssson char *name; 59192867Ssson size_t size; 60192867Ssson} syment_t; 61192867Ssson 62192867Sssonstatic syment_t *symbol_table; 63192867Sssonstatic int nsyms, maxsyms; 64192867Sssonstatic char maxsymname[64]; 65192867Ssson 66192867Ssson#if defined(sun) 67192867Ssson#ifdef _ELF64 68192867Ssson#define elf_getshdr elf64_getshdr 69192867Ssson#else 70192867Ssson#define elf_getshdr elf32_getshdr 71192867Ssson#endif 72192867Ssson#endif 73192867Ssson 74192867Sssonstatic void 75192867Sssonadd_symbol(char *name, uintptr_t addr, size_t size) 76192867Ssson{ 77192867Ssson syment_t *sep; 78192867Ssson 79192867Ssson if (nsyms >= maxsyms) { 80192867Ssson maxsyms += 10000; 81192867Ssson symbol_table = realloc(symbol_table, maxsyms * sizeof (*sep)); 82192867Ssson if (symbol_table == NULL) { 83192867Ssson (void) fprintf(stderr, "can't allocate symbol table\n"); 84192867Ssson exit(3); 85192867Ssson } 86192867Ssson } 87192867Ssson sep = &symbol_table[nsyms++]; 88192867Ssson 89192867Ssson sep->name = name; 90192867Ssson sep->addr = addr; 91192867Ssson sep->size = size; 92192867Ssson} 93192867Ssson 94192867Sssonstatic void 95192867Sssonremove_symbol(uintptr_t addr) 96192867Ssson{ 97192867Ssson int i; 98192867Ssson syment_t *sep = symbol_table; 99192867Ssson 100192867Ssson for (i = 0; i < nsyms; i++, sep++) 101192867Ssson if (sep->addr == addr) 102192867Ssson sep->addr = 0; 103192867Ssson} 104192867Ssson 105192867Ssson#if defined(sun) 106192867Sssonstatic void 107192867Sssonfake_up_certain_popular_kernel_symbols(void) 108192867Ssson{ 109192867Ssson kstat_ctl_t *kc; 110192867Ssson kstat_t *ksp; 111192867Ssson char *name; 112192867Ssson 113192867Ssson if ((kc = kstat_open()) == NULL) 114192867Ssson return; 115192867Ssson 116192867Ssson for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) { 117192867Ssson if (strcmp(ksp->ks_module, "cpu_info") == 0) { 118192867Ssson if ((name = malloc(20)) == NULL) 119192867Ssson break; 120192867Ssson /* 121192867Ssson * For consistency, keep cpu[0] and toss cpu0 122192867Ssson * or any other such symbols. 123192867Ssson */ 124192867Ssson if (ksp->ks_instance == 0) 125192867Ssson remove_symbol((uintptr_t)ksp->ks_private); 126192867Ssson (void) sprintf(name, "cpu[%d]", ksp->ks_instance); 127192867Ssson add_symbol(name, (uintptr_t)ksp->ks_private, 128192867Ssson sizeof (struct cpu)); 129192867Ssson } 130192867Ssson } 131192867Ssson (void) kstat_close(kc); 132192867Ssson} 133192867Ssson#else 134192867Ssson/* FreeBSD */ 135192867Sssonstatic void 136192867Sssonfake_up_certain_popular_kernel_symbols(void) 137192867Ssson{ 138192867Ssson char *name; 139192867Ssson uintptr_t addr; 140192867Ssson int i; 141192867Ssson 142192867Ssson /* Good for up to 256 CPUs */ 143192867Ssson for(i=0; i < 256; i++) { 144192867Ssson if ((name = malloc(20)) == NULL) 145192867Ssson break; 146192867Ssson (void) sprintf(name, "cpu[%d]", i); 147192867Ssson addr = 0x01000000 + (i << 16); 148192867Ssson add_symbol(name, addr, sizeof (uintptr_t)); 149192867Ssson } 150192867Ssson} 151192867Ssson#endif /* !defined(sun) */ 152192867Ssson 153192867Sssonstatic int 154192867Sssonsymcmp(const void *p1, const void *p2) 155192867Ssson{ 156192867Ssson uintptr_t a1 = ((syment_t *)p1)->addr; 157192867Ssson uintptr_t a2 = ((syment_t *)p2)->addr; 158192867Ssson 159192867Ssson if (a1 < a2) 160192867Ssson return (-1); 161192867Ssson if (a1 > a2) 162192867Ssson return (1); 163192867Ssson return (0); 164192867Ssson} 165192867Ssson 166192867Sssonint 167192867Sssonsymtab_init(void) 168192867Ssson{ 169192867Ssson Elf *elf; 170192867Ssson Elf_Scn *scn = NULL; 171192867Ssson Sym *symtab, *symp, *lastsym; 172192867Ssson char *strtab; 173192867Ssson uint_t cnt; 174192867Ssson int fd; 175192867Ssson int i; 176192867Ssson int strindex = -1; 177192867Ssson#if !defined(sun) 178192867Ssson void *ksyms; 179192867Ssson size_t sz; 180192867Ssson#endif 181192867Ssson 182192867Ssson if ((fd = open("/dev/ksyms", O_RDONLY)) == -1) 183192867Ssson return (-1); 184192867Ssson 185192867Ssson#if defined(sun) 186192867Ssson (void) elf_version(EV_CURRENT); 187192867Ssson 188192867Ssson elf = elf_begin(fd, ELF_C_READ, NULL); 189192867Ssson#else 190192867Ssson /* FreeBSD */ 191192867Ssson /* 192192867Ssson * XXX - libelf needs to be fixed so it will work with 193192867Ssson * non 'ordinary' files like /dev/ksyms. The following 194192867Ssson * is a work around for now. 195192867Ssson */ 196192867Ssson if (elf_version(EV_CURRENT) == EV_NONE) { 197192867Ssson close(fd); 198192867Ssson return (-1); 199192867Ssson } 200192867Ssson if (ioctl(fd, KIOCGSIZE, &sz) < 0) { 201192867Ssson close(fd); 202192867Ssson return (-1); 203192867Ssson } 204192867Ssson if (ioctl(fd, KIOCGADDR, &ksyms) < 0) { 205192867Ssson close(fd); 206192867Ssson return (-1); 207192867Ssson } 208192867Ssson if ((elf = elf_memory(ksyms, sz)) == NULL) { 209192867Ssson close(fd); 210192867Ssson return (-1); 211192867Ssson } 212192867Ssson#endif 213192867Ssson 214192867Ssson for (cnt = 1; (scn = elf_nextscn(elf, scn)) != NULL; cnt++) { 215192867Ssson Shdr *shdr = elf_getshdr(scn); 216192867Ssson if (shdr->sh_type == SHT_SYMTAB) { 217192867Ssson symtab = (Sym *)elf_getdata(scn, NULL)->d_buf; 218192867Ssson nsyms = shdr->sh_size / shdr->sh_entsize; 219192867Ssson strindex = shdr->sh_link; 220192867Ssson } 221192867Ssson } 222192867Ssson 223192867Ssson for (cnt = 1; (scn = elf_nextscn(elf, scn)) != NULL; cnt++) { 224192867Ssson if (cnt == strindex) 225192867Ssson strtab = (char *)elf_getdata(scn, NULL)->d_buf; 226192867Ssson } 227192867Ssson 228192867Ssson lastsym = symtab + nsyms; 229192867Ssson nsyms = 0; 230192867Ssson for (symp = symtab; symp < lastsym; symp++) 231192867Ssson if ((uint_t)ELF32_ST_TYPE(symp->st_info) <= STT_FUNC && 232192867Ssson symp->st_size != 0) 233192867Ssson add_symbol(symp->st_name + strtab, 234192867Ssson (uintptr_t)symp->st_value, (size_t)symp->st_size); 235192867Ssson 236192867Ssson fake_up_certain_popular_kernel_symbols(); 237192867Ssson (void) sprintf(maxsymname, "0x%lx", ULONG_MAX); 238192867Ssson add_symbol(maxsymname, ULONG_MAX, 1); 239192867Ssson 240192867Ssson qsort(symbol_table, nsyms, sizeof (syment_t), symcmp); 241192867Ssson 242192867Ssson /* 243192867Ssson * Destroy all duplicate symbols, then sort it again. 244192867Ssson */ 245192867Ssson for (i = 0; i < nsyms - 1; i++) 246192867Ssson if (symbol_table[i].addr == symbol_table[i + 1].addr) 247192867Ssson symbol_table[i].addr = 0; 248192867Ssson 249192867Ssson qsort(symbol_table, nsyms, sizeof (syment_t), symcmp); 250192867Ssson 251192867Ssson while (symbol_table[1].addr == 0) { 252192867Ssson symbol_table++; 253192867Ssson nsyms--; 254192867Ssson } 255192867Ssson symbol_table[0].name = "(usermode)"; 256192867Ssson symbol_table[0].addr = 0; 257192867Ssson symbol_table[0].size = 1; 258192867Ssson 259192867Ssson close(fd); 260192867Ssson return (0); 261192867Ssson} 262192867Ssson 263192867Sssonchar * 264192867Sssonaddr_to_sym(uintptr_t addr, uintptr_t *offset, size_t *sizep) 265192867Ssson{ 266192867Ssson int lo = 0; 267192867Ssson int hi = nsyms - 1; 268192867Ssson int mid; 269192867Ssson syment_t *sep; 270192867Ssson 271192867Ssson while (hi - lo > 1) { 272192867Ssson mid = (lo + hi) / 2; 273192867Ssson if (addr >= symbol_table[mid].addr) { 274192867Ssson lo = mid; 275192867Ssson } else { 276192867Ssson hi = mid; 277192867Ssson } 278192867Ssson } 279192867Ssson sep = &symbol_table[lo]; 280192867Ssson *offset = addr - sep->addr; 281192867Ssson *sizep = sep->size; 282192867Ssson return (sep->name); 283192867Ssson} 284192867Ssson 285192867Sssonuintptr_t 286192867Sssonsym_to_addr(char *name) 287192867Ssson{ 288192867Ssson int i; 289192867Ssson syment_t *sep = symbol_table; 290192867Ssson 291192867Ssson for (i = 0; i < nsyms; i++) { 292192867Ssson if (strcmp(name, sep->name) == 0) 293192867Ssson return (sep->addr); 294192867Ssson sep++; 295192867Ssson } 296192867Ssson return (0); 297192867Ssson} 298192867Ssson 299192867Sssonsize_t 300192867Sssonsym_size(char *name) 301192867Ssson{ 302192867Ssson int i; 303192867Ssson syment_t *sep = symbol_table; 304192867Ssson 305192867Ssson for (i = 0; i < nsyms; i++) { 306192867Ssson if (strcmp(name, sep->name) == 0) 307192867Ssson return (sep->size); 308192867Ssson sep++; 309192867Ssson } 310192867Ssson return (0); 311192867Ssson} 312