16ff6d951SJohn Birrell /* 26ff6d951SJohn Birrell * CDDL HEADER START 36ff6d951SJohn Birrell * 46ff6d951SJohn Birrell * The contents of this file are subject to the terms of the 56ff6d951SJohn Birrell * Common Development and Distribution License (the "License"). 66ff6d951SJohn Birrell * You may not use this file except in compliance with the License. 76ff6d951SJohn Birrell * 86ff6d951SJohn Birrell * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 96ff6d951SJohn Birrell * or http://www.opensolaris.org/os/licensing. 106ff6d951SJohn Birrell * See the License for the specific language governing permissions 116ff6d951SJohn Birrell * and limitations under the License. 126ff6d951SJohn Birrell * 136ff6d951SJohn Birrell * When distributing Covered Code, include this CDDL HEADER in each 146ff6d951SJohn Birrell * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 156ff6d951SJohn Birrell * If applicable, add the following below this CDDL HEADER, with the 166ff6d951SJohn Birrell * fields enclosed by brackets "[]" replaced with your own identifying 176ff6d951SJohn Birrell * information: Portions Copyright [yyyy] [name of copyright owner] 186ff6d951SJohn Birrell * 196ff6d951SJohn Birrell * CDDL HEADER END 206ff6d951SJohn Birrell */ 216ff6d951SJohn Birrell 226ff6d951SJohn Birrell /* 232693feb4SJohn Birrell * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 246ff6d951SJohn Birrell * Use is subject to license terms. 25df7165b8SMark Johnston * Copyright 2017-2018 Mark Johnston <markj@FreeBSD.org> 266ff6d951SJohn Birrell */ 276ff6d951SJohn Birrell 280e15d9fbSMark Johnston #include <sys/param.h> 290e15d9fbSMark Johnston #include <sys/mman.h> 300e15d9fbSMark Johnston #include <sys/wait.h> 316ff6d951SJohn Birrell 320e15d9fbSMark Johnston #include <assert.h> 336ff6d951SJohn Birrell #include <elf.h> 340e15d9fbSMark Johnston #include <fcntl.h> 350e15d9fbSMark Johnston #include <gelf.h> 366ff6d951SJohn Birrell #include <limits.h> 376ff6d951SJohn Birrell #include <stddef.h> 386ff6d951SJohn Birrell #include <stdio.h> 390e15d9fbSMark Johnston #include <stdlib.h> 400e15d9fbSMark Johnston #include <strings.h> 416ff6d951SJohn Birrell #include <errno.h> 420e15d9fbSMark Johnston #include <unistd.h> 430e15d9fbSMark Johnston 440f2bd1e8SRui Paulo #include <libelf.h> 456ff6d951SJohn Birrell 466ff6d951SJohn Birrell #include <dt_impl.h> 476ff6d951SJohn Birrell #include <dt_provider.h> 486ff6d951SJohn Birrell #include <dt_program.h> 496ff6d951SJohn Birrell #include <dt_string.h> 506ff6d951SJohn Birrell 516ff6d951SJohn Birrell #define ESHDR_NULL 0 526ff6d951SJohn Birrell #define ESHDR_SHSTRTAB 1 536ff6d951SJohn Birrell #define ESHDR_DOF 2 546ff6d951SJohn Birrell #define ESHDR_STRTAB 3 556ff6d951SJohn Birrell #define ESHDR_SYMTAB 4 566ff6d951SJohn Birrell #define ESHDR_REL 5 576ff6d951SJohn Birrell #define ESHDR_NUM 6 586ff6d951SJohn Birrell 596ff6d951SJohn Birrell #define PWRITE_SCN(index, data) \ 606ff6d951SJohn Birrell (lseek64(fd, (off64_t)elf_file.shdr[(index)].sh_offset, SEEK_SET) != \ 616ff6d951SJohn Birrell (off64_t)elf_file.shdr[(index)].sh_offset || \ 626ff6d951SJohn Birrell dt_write(dtp, fd, (data), elf_file.shdr[(index)].sh_size) != \ 636ff6d951SJohn Birrell elf_file.shdr[(index)].sh_size) 646ff6d951SJohn Birrell 656ff6d951SJohn Birrell static const char DTRACE_SHSTRTAB32[] = "\0" 666ff6d951SJohn Birrell ".shstrtab\0" /* 1 */ 676ff6d951SJohn Birrell ".SUNW_dof\0" /* 11 */ 686ff6d951SJohn Birrell ".strtab\0" /* 21 */ 696ff6d951SJohn Birrell ".symtab\0" /* 29 */ 706ff6d951SJohn Birrell ".rel.SUNW_dof"; /* 37 */ 716ff6d951SJohn Birrell 726ff6d951SJohn Birrell static const char DTRACE_SHSTRTAB64[] = "\0" 736ff6d951SJohn Birrell ".shstrtab\0" /* 1 */ 746ff6d951SJohn Birrell ".SUNW_dof\0" /* 11 */ 756ff6d951SJohn Birrell ".strtab\0" /* 21 */ 766ff6d951SJohn Birrell ".symtab\0" /* 29 */ 776ff6d951SJohn Birrell ".rela.SUNW_dof"; /* 37 */ 786ff6d951SJohn Birrell 796ff6d951SJohn Birrell static const char DOFSTR[] = "__SUNW_dof"; 806ff6d951SJohn Birrell static const char DOFLAZYSTR[] = "___SUNW_dof"; 816ff6d951SJohn Birrell 826ff6d951SJohn Birrell typedef struct dt_link_pair { 836ff6d951SJohn Birrell struct dt_link_pair *dlp_next; /* next pair in linked list */ 846ff6d951SJohn Birrell void *dlp_str; /* buffer for string table */ 856ff6d951SJohn Birrell void *dlp_sym; /* buffer for symbol table */ 866ff6d951SJohn Birrell } dt_link_pair_t; 876ff6d951SJohn Birrell 886ff6d951SJohn Birrell typedef struct dof_elf32 { 896ff6d951SJohn Birrell uint32_t de_nrel; /* relocation count */ 906ff6d951SJohn Birrell Elf32_Rel *de_rel; /* array of relocations for x86 */ 916ff6d951SJohn Birrell uint32_t de_nsym; /* symbol count */ 926ff6d951SJohn Birrell Elf32_Sym *de_sym; /* array of symbols */ 936ff6d951SJohn Birrell uint32_t de_strlen; /* size of of string table */ 946ff6d951SJohn Birrell char *de_strtab; /* string table */ 956ff6d951SJohn Birrell uint32_t de_global; /* index of the first global symbol */ 966ff6d951SJohn Birrell } dof_elf32_t; 976ff6d951SJohn Birrell 986ff6d951SJohn Birrell static int 996ff6d951SJohn Birrell prepare_elf32(dtrace_hdl_t *dtp, const dof_hdr_t *dof, dof_elf32_t *dep) 1006ff6d951SJohn Birrell { 1016ff6d951SJohn Birrell dof_sec_t *dofs, *s; 1026ff6d951SJohn Birrell dof_relohdr_t *dofrh; 1036ff6d951SJohn Birrell dof_relodesc_t *dofr; 1046ff6d951SJohn Birrell char *strtab; 1056ff6d951SJohn Birrell int i, j, nrel; 1066ff6d951SJohn Birrell size_t strtabsz = 1; 1076ff6d951SJohn Birrell uint32_t count = 0; 1086ff6d951SJohn Birrell size_t base; 1096ff6d951SJohn Birrell Elf32_Sym *sym; 1106ff6d951SJohn Birrell Elf32_Rel *rel; 1116ff6d951SJohn Birrell 1126ff6d951SJohn Birrell /*LINTED*/ 1136ff6d951SJohn Birrell dofs = (dof_sec_t *)((char *)dof + dof->dofh_secoff); 1146ff6d951SJohn Birrell 1156ff6d951SJohn Birrell /* 1166ff6d951SJohn Birrell * First compute the size of the string table and the number of 1176ff6d951SJohn Birrell * relocations present in the DOF. 1186ff6d951SJohn Birrell */ 1196ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 1206ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 1216ff6d951SJohn Birrell continue; 1226ff6d951SJohn Birrell 1236ff6d951SJohn Birrell /*LINTED*/ 1246ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 1256ff6d951SJohn Birrell 1266ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 1276ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 1286ff6d951SJohn Birrell assert(strtab[0] == '\0'); 1296ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 1306ff6d951SJohn Birrell 1316ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 1326ff6d951SJohn Birrell /*LINTED*/ 1336ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 1346ff6d951SJohn Birrell count += s->dofs_size / s->dofs_entsize; 1356ff6d951SJohn Birrell } 1366ff6d951SJohn Birrell 1376ff6d951SJohn Birrell dep->de_strlen = strtabsz; 1386ff6d951SJohn Birrell dep->de_nrel = count; 1396ff6d951SJohn Birrell dep->de_nsym = count + 1; /* the first symbol is always null */ 1406ff6d951SJohn Birrell 1416ff6d951SJohn Birrell if (dtp->dt_lazyload) { 1426ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFLAZYSTR); 1436ff6d951SJohn Birrell dep->de_nsym++; 1446ff6d951SJohn Birrell } else { 1456ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFSTR); 1466ff6d951SJohn Birrell dep->de_nsym++; 1476ff6d951SJohn Birrell } 1486ff6d951SJohn Birrell 1496ff6d951SJohn Birrell if ((dep->de_rel = calloc(dep->de_nrel, 1506ff6d951SJohn Birrell sizeof (dep->de_rel[0]))) == NULL) { 1516ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 1526ff6d951SJohn Birrell } 1536ff6d951SJohn Birrell 1546ff6d951SJohn Birrell if ((dep->de_sym = calloc(dep->de_nsym, sizeof (Elf32_Sym))) == NULL) { 1556ff6d951SJohn Birrell free(dep->de_rel); 1566ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 1576ff6d951SJohn Birrell } 1586ff6d951SJohn Birrell 1596ff6d951SJohn Birrell if ((dep->de_strtab = calloc(dep->de_strlen, 1)) == NULL) { 1606ff6d951SJohn Birrell free(dep->de_rel); 1616ff6d951SJohn Birrell free(dep->de_sym); 1626ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 1636ff6d951SJohn Birrell } 1646ff6d951SJohn Birrell 1656ff6d951SJohn Birrell count = 0; 1666ff6d951SJohn Birrell strtabsz = 1; 1676ff6d951SJohn Birrell dep->de_strtab[0] = '\0'; 1686ff6d951SJohn Birrell rel = dep->de_rel; 1696ff6d951SJohn Birrell sym = dep->de_sym; 1706ff6d951SJohn Birrell dep->de_global = 1; 1716ff6d951SJohn Birrell 1726ff6d951SJohn Birrell /* 1736ff6d951SJohn Birrell * The first symbol table entry must be zeroed and is always ignored. 1746ff6d951SJohn Birrell */ 1756ff6d951SJohn Birrell bzero(sym, sizeof (Elf32_Sym)); 1766ff6d951SJohn Birrell sym++; 1776ff6d951SJohn Birrell 1786ff6d951SJohn Birrell /* 1796ff6d951SJohn Birrell * Take a second pass through the DOF sections filling in the 1806ff6d951SJohn Birrell * memory we allocated. 1816ff6d951SJohn Birrell */ 1826ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 1836ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 1846ff6d951SJohn Birrell continue; 1856ff6d951SJohn Birrell 1866ff6d951SJohn Birrell /*LINTED*/ 1876ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 1886ff6d951SJohn Birrell 1896ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 1906ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 1916ff6d951SJohn Birrell bcopy(strtab + 1, dep->de_strtab + strtabsz, s->dofs_size); 1926ff6d951SJohn Birrell base = strtabsz; 1936ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 1946ff6d951SJohn Birrell 1956ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 1966ff6d951SJohn Birrell /*LINTED*/ 1976ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 1986ff6d951SJohn Birrell nrel = s->dofs_size / s->dofs_entsize; 1996ff6d951SJohn Birrell 2006ff6d951SJohn Birrell s = &dofs[dofrh->dofr_tgtsec]; 2016ff6d951SJohn Birrell 2026ff6d951SJohn Birrell for (j = 0; j < nrel; j++) { 203b78ee15eSRuslan Bukin #if defined(__aarch64__) 204a2ea7849SMark Johnston rel->r_offset = s->dofs_offset + 205a2ea7849SMark Johnston dofr[j].dofr_offset; 206a2ea7849SMark Johnston rel->r_info = ELF32_R_INFO(count + dep->de_global, 207a2ea7849SMark Johnston R_ARM_REL32); 208b78ee15eSRuslan Bukin #elif defined(__arm__) 2092693feb4SJohn Birrell /* XXX */ 210732f2c69SEd Maste printf("%s:%s(%d): arm not implemented\n", 211732f2c69SEd Maste __FUNCTION__, __FILE__, __LINE__); 2122693feb4SJohn Birrell #elif defined(__i386) || defined(__amd64) 2136ff6d951SJohn Birrell rel->r_offset = s->dofs_offset + 2146ff6d951SJohn Birrell dofr[j].dofr_offset; 2156ff6d951SJohn Birrell rel->r_info = ELF32_R_INFO(count + dep->de_global, 216e801af6fSMark Johnston R_386_PC32); 2172693feb4SJohn Birrell #elif defined(__mips__) 2182693feb4SJohn Birrell /* XXX */ 219732f2c69SEd Maste printf("%s:%s(%d): MIPS not implemented\n", 220732f2c69SEd Maste __FUNCTION__, __FILE__, __LINE__); 2212693feb4SJohn Birrell #elif defined(__powerpc__) 22230b318b9SJustin Hibbits /* 22330b318b9SJustin Hibbits * Add 4 bytes to hit the low half of this 64-bit 22430b318b9SJustin Hibbits * big-endian address. 22530b318b9SJustin Hibbits */ 22630b318b9SJustin Hibbits rel->r_offset = s->dofs_offset + 22730b318b9SJustin Hibbits dofr[j].dofr_offset + 4; 22830b318b9SJustin Hibbits rel->r_info = ELF32_R_INFO(count + dep->de_global, 22930b318b9SJustin Hibbits R_PPC_REL32); 230ca20f8ecSRuslan Bukin #elif defined(__riscv) 231fed1ca4bSRuslan Bukin /* XXX */ 232732f2c69SEd Maste printf("%s:%s(%d): RISC-V not implemented\n", 233732f2c69SEd Maste __FUNCTION__, __FILE__, __LINE__); 2346ff6d951SJohn Birrell #else 2356ff6d951SJohn Birrell #error unknown ISA 2366ff6d951SJohn Birrell #endif 2376ff6d951SJohn Birrell 2386ff6d951SJohn Birrell sym->st_name = base + dofr[j].dofr_name - 1; 2396ff6d951SJohn Birrell sym->st_value = 0; 2406ff6d951SJohn Birrell sym->st_size = 0; 2416ff6d951SJohn Birrell sym->st_info = ELF32_ST_INFO(STB_GLOBAL, STT_FUNC); 242df7165b8SMark Johnston sym->st_other = ELF32_ST_VISIBILITY(STV_HIDDEN); 2436ff6d951SJohn Birrell sym->st_shndx = SHN_UNDEF; 2446ff6d951SJohn Birrell 2456ff6d951SJohn Birrell rel++; 2466ff6d951SJohn Birrell sym++; 2476ff6d951SJohn Birrell count++; 2486ff6d951SJohn Birrell } 2496ff6d951SJohn Birrell } 2506ff6d951SJohn Birrell 2516ff6d951SJohn Birrell /* 2526ff6d951SJohn Birrell * Add a symbol for the DOF itself. We use a different symbol for 2536ff6d951SJohn Birrell * lazily and actively loaded DOF to make them easy to distinguish. 2546ff6d951SJohn Birrell */ 2556ff6d951SJohn Birrell sym->st_name = strtabsz; 2566ff6d951SJohn Birrell sym->st_value = 0; 2576ff6d951SJohn Birrell sym->st_size = dof->dofh_filesz; 2586ff6d951SJohn Birrell sym->st_info = ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT); 25903a5f9f0SMark Johnston sym->st_other = ELF32_ST_VISIBILITY(STV_HIDDEN); 2606ff6d951SJohn Birrell sym->st_shndx = ESHDR_DOF; 2616ff6d951SJohn Birrell sym++; 2626ff6d951SJohn Birrell 2636ff6d951SJohn Birrell if (dtp->dt_lazyload) { 2646ff6d951SJohn Birrell bcopy(DOFLAZYSTR, dep->de_strtab + strtabsz, 2656ff6d951SJohn Birrell sizeof (DOFLAZYSTR)); 2666ff6d951SJohn Birrell strtabsz += sizeof (DOFLAZYSTR); 2676ff6d951SJohn Birrell } else { 2686ff6d951SJohn Birrell bcopy(DOFSTR, dep->de_strtab + strtabsz, sizeof (DOFSTR)); 2696ff6d951SJohn Birrell strtabsz += sizeof (DOFSTR); 2706ff6d951SJohn Birrell } 2716ff6d951SJohn Birrell 2726ff6d951SJohn Birrell assert(count == dep->de_nrel); 2736ff6d951SJohn Birrell assert(strtabsz == dep->de_strlen); 2746ff6d951SJohn Birrell 2756ff6d951SJohn Birrell return (0); 2766ff6d951SJohn Birrell } 2776ff6d951SJohn Birrell 2786ff6d951SJohn Birrell 2796ff6d951SJohn Birrell typedef struct dof_elf64 { 2806ff6d951SJohn Birrell uint32_t de_nrel; 2816ff6d951SJohn Birrell Elf64_Rela *de_rel; 2826ff6d951SJohn Birrell uint32_t de_nsym; 2836ff6d951SJohn Birrell Elf64_Sym *de_sym; 2846ff6d951SJohn Birrell 2856ff6d951SJohn Birrell uint32_t de_strlen; 2866ff6d951SJohn Birrell char *de_strtab; 2876ff6d951SJohn Birrell 2886ff6d951SJohn Birrell uint32_t de_global; 2896ff6d951SJohn Birrell } dof_elf64_t; 2906ff6d951SJohn Birrell 2916ff6d951SJohn Birrell static int 2926ff6d951SJohn Birrell prepare_elf64(dtrace_hdl_t *dtp, const dof_hdr_t *dof, dof_elf64_t *dep) 2936ff6d951SJohn Birrell { 2946ff6d951SJohn Birrell dof_sec_t *dofs, *s; 2956ff6d951SJohn Birrell dof_relohdr_t *dofrh; 2966ff6d951SJohn Birrell dof_relodesc_t *dofr; 2976ff6d951SJohn Birrell char *strtab; 2986ff6d951SJohn Birrell int i, j, nrel; 2996ff6d951SJohn Birrell size_t strtabsz = 1; 3008caf8a8dSMark Johnston uint64_t count = 0; 3016ff6d951SJohn Birrell size_t base; 3026ff6d951SJohn Birrell Elf64_Sym *sym; 3036ff6d951SJohn Birrell Elf64_Rela *rel; 3046ff6d951SJohn Birrell 3056ff6d951SJohn Birrell /*LINTED*/ 3066ff6d951SJohn Birrell dofs = (dof_sec_t *)((char *)dof + dof->dofh_secoff); 3076ff6d951SJohn Birrell 3086ff6d951SJohn Birrell /* 3096ff6d951SJohn Birrell * First compute the size of the string table and the number of 3106ff6d951SJohn Birrell * relocations present in the DOF. 3116ff6d951SJohn Birrell */ 3126ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 3136ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 3146ff6d951SJohn Birrell continue; 3156ff6d951SJohn Birrell 3166ff6d951SJohn Birrell /*LINTED*/ 3176ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 3186ff6d951SJohn Birrell 3196ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 3206ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 3216ff6d951SJohn Birrell assert(strtab[0] == '\0'); 3226ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 3236ff6d951SJohn Birrell 3246ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 3256ff6d951SJohn Birrell /*LINTED*/ 3266ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 3276ff6d951SJohn Birrell count += s->dofs_size / s->dofs_entsize; 3286ff6d951SJohn Birrell } 3296ff6d951SJohn Birrell 3306ff6d951SJohn Birrell dep->de_strlen = strtabsz; 3316ff6d951SJohn Birrell dep->de_nrel = count; 3326ff6d951SJohn Birrell dep->de_nsym = count + 1; /* the first symbol is always null */ 3336ff6d951SJohn Birrell 3346ff6d951SJohn Birrell if (dtp->dt_lazyload) { 3356ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFLAZYSTR); 3366ff6d951SJohn Birrell dep->de_nsym++; 3376ff6d951SJohn Birrell } else { 3386ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFSTR); 3396ff6d951SJohn Birrell dep->de_nsym++; 3406ff6d951SJohn Birrell } 3416ff6d951SJohn Birrell 3426ff6d951SJohn Birrell if ((dep->de_rel = calloc(dep->de_nrel, 3436ff6d951SJohn Birrell sizeof (dep->de_rel[0]))) == NULL) { 3446ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 3456ff6d951SJohn Birrell } 3466ff6d951SJohn Birrell 3476ff6d951SJohn Birrell if ((dep->de_sym = calloc(dep->de_nsym, sizeof (Elf64_Sym))) == NULL) { 3486ff6d951SJohn Birrell free(dep->de_rel); 3496ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 3506ff6d951SJohn Birrell } 3516ff6d951SJohn Birrell 3526ff6d951SJohn Birrell if ((dep->de_strtab = calloc(dep->de_strlen, 1)) == NULL) { 3536ff6d951SJohn Birrell free(dep->de_rel); 3546ff6d951SJohn Birrell free(dep->de_sym); 3556ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 3566ff6d951SJohn Birrell } 3576ff6d951SJohn Birrell 3586ff6d951SJohn Birrell count = 0; 3596ff6d951SJohn Birrell strtabsz = 1; 3606ff6d951SJohn Birrell dep->de_strtab[0] = '\0'; 3616ff6d951SJohn Birrell rel = dep->de_rel; 3626ff6d951SJohn Birrell sym = dep->de_sym; 3636ff6d951SJohn Birrell dep->de_global = 1; 3646ff6d951SJohn Birrell 3656ff6d951SJohn Birrell /* 3666ff6d951SJohn Birrell * The first symbol table entry must be zeroed and is always ignored. 3676ff6d951SJohn Birrell */ 3686ff6d951SJohn Birrell bzero(sym, sizeof (Elf64_Sym)); 3696ff6d951SJohn Birrell sym++; 3706ff6d951SJohn Birrell 3716ff6d951SJohn Birrell /* 3726ff6d951SJohn Birrell * Take a second pass through the DOF sections filling in the 3736ff6d951SJohn Birrell * memory we allocated. 3746ff6d951SJohn Birrell */ 3756ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 3766ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 3776ff6d951SJohn Birrell continue; 3786ff6d951SJohn Birrell 3796ff6d951SJohn Birrell /*LINTED*/ 3806ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 3816ff6d951SJohn Birrell 3826ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 3836ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 3846ff6d951SJohn Birrell bcopy(strtab + 1, dep->de_strtab + strtabsz, s->dofs_size); 3856ff6d951SJohn Birrell base = strtabsz; 3866ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 3876ff6d951SJohn Birrell 3886ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 3896ff6d951SJohn Birrell /*LINTED*/ 3906ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 3916ff6d951SJohn Birrell nrel = s->dofs_size / s->dofs_entsize; 3926ff6d951SJohn Birrell 3936ff6d951SJohn Birrell s = &dofs[dofrh->dofr_tgtsec]; 3946ff6d951SJohn Birrell 3956ff6d951SJohn Birrell for (j = 0; j < nrel; j++) { 396b78ee15eSRuslan Bukin #if defined(__aarch64__) 397a2ea7849SMark Johnston rel->r_offset = s->dofs_offset + 398a2ea7849SMark Johnston dofr[j].dofr_offset; 399a2ea7849SMark Johnston rel->r_info = ELF64_R_INFO(count + dep->de_global, 400a2ea7849SMark Johnston R_AARCH64_PREL64); 401b78ee15eSRuslan Bukin #elif defined(__arm__) 4022693feb4SJohn Birrell /* XXX */ 4032693feb4SJohn Birrell #elif defined(__mips__) 4042693feb4SJohn Birrell /* XXX */ 4052693feb4SJohn Birrell #elif defined(__powerpc__) 40630b318b9SJustin Hibbits rel->r_offset = s->dofs_offset + 40730b318b9SJustin Hibbits dofr[j].dofr_offset; 40830b318b9SJustin Hibbits rel->r_info = ELF64_R_INFO(count + dep->de_global, 40930b318b9SJustin Hibbits R_PPC64_REL64); 410ca20f8ecSRuslan Bukin #elif defined(__riscv) 411fed1ca4bSRuslan Bukin /* XXX */ 4122693feb4SJohn Birrell #elif defined(__i386) || defined(__amd64) 4136ff6d951SJohn Birrell rel->r_offset = s->dofs_offset + 4146ff6d951SJohn Birrell dofr[j].dofr_offset; 4156ff6d951SJohn Birrell rel->r_info = ELF64_R_INFO(count + dep->de_global, 416e801af6fSMark Johnston R_X86_64_PC64); 4176ff6d951SJohn Birrell #else 4186ff6d951SJohn Birrell #error unknown ISA 4196ff6d951SJohn Birrell #endif 4206ff6d951SJohn Birrell 4216ff6d951SJohn Birrell sym->st_name = base + dofr[j].dofr_name - 1; 4226ff6d951SJohn Birrell sym->st_value = 0; 4236ff6d951SJohn Birrell sym->st_size = 0; 4246ff6d951SJohn Birrell sym->st_info = GELF_ST_INFO(STB_GLOBAL, STT_FUNC); 425df7165b8SMark Johnston sym->st_other = ELF64_ST_VISIBILITY(STV_HIDDEN); 4266ff6d951SJohn Birrell sym->st_shndx = SHN_UNDEF; 4276ff6d951SJohn Birrell 4286ff6d951SJohn Birrell rel++; 4296ff6d951SJohn Birrell sym++; 4306ff6d951SJohn Birrell count++; 4316ff6d951SJohn Birrell } 4326ff6d951SJohn Birrell } 4336ff6d951SJohn Birrell 4346ff6d951SJohn Birrell /* 4356ff6d951SJohn Birrell * Add a symbol for the DOF itself. We use a different symbol for 4366ff6d951SJohn Birrell * lazily and actively loaded DOF to make them easy to distinguish. 4376ff6d951SJohn Birrell */ 4386ff6d951SJohn Birrell sym->st_name = strtabsz; 4396ff6d951SJohn Birrell sym->st_value = 0; 4406ff6d951SJohn Birrell sym->st_size = dof->dofh_filesz; 4416ff6d951SJohn Birrell sym->st_info = GELF_ST_INFO(STB_GLOBAL, STT_OBJECT); 44203a5f9f0SMark Johnston sym->st_other = ELF64_ST_VISIBILITY(STV_HIDDEN); 4436ff6d951SJohn Birrell sym->st_shndx = ESHDR_DOF; 4446ff6d951SJohn Birrell sym++; 4456ff6d951SJohn Birrell 4466ff6d951SJohn Birrell if (dtp->dt_lazyload) { 4476ff6d951SJohn Birrell bcopy(DOFLAZYSTR, dep->de_strtab + strtabsz, 4486ff6d951SJohn Birrell sizeof (DOFLAZYSTR)); 4496ff6d951SJohn Birrell strtabsz += sizeof (DOFLAZYSTR); 4506ff6d951SJohn Birrell } else { 4516ff6d951SJohn Birrell bcopy(DOFSTR, dep->de_strtab + strtabsz, sizeof (DOFSTR)); 4526ff6d951SJohn Birrell strtabsz += sizeof (DOFSTR); 4536ff6d951SJohn Birrell } 4546ff6d951SJohn Birrell 4556ff6d951SJohn Birrell assert(count == dep->de_nrel); 4566ff6d951SJohn Birrell assert(strtabsz == dep->de_strlen); 4576ff6d951SJohn Birrell 4586ff6d951SJohn Birrell return (0); 4596ff6d951SJohn Birrell } 4606ff6d951SJohn Birrell 4616ff6d951SJohn Birrell /* 4626ff6d951SJohn Birrell * Write out an ELF32 file prologue consisting of a header, section headers, 4636ff6d951SJohn Birrell * and a section header string table. The DOF data will follow this prologue 4646ff6d951SJohn Birrell * and complete the contents of the given ELF file. 4656ff6d951SJohn Birrell */ 4666ff6d951SJohn Birrell static int 4676ff6d951SJohn Birrell dump_elf32(dtrace_hdl_t *dtp, const dof_hdr_t *dof, int fd) 4686ff6d951SJohn Birrell { 4696ff6d951SJohn Birrell struct { 4706ff6d951SJohn Birrell Elf32_Ehdr ehdr; 4716ff6d951SJohn Birrell Elf32_Shdr shdr[ESHDR_NUM]; 4726ff6d951SJohn Birrell } elf_file; 4736ff6d951SJohn Birrell 4746ff6d951SJohn Birrell Elf32_Shdr *shp; 4756ff6d951SJohn Birrell Elf32_Off off; 4766ff6d951SJohn Birrell dof_elf32_t de; 4776ff6d951SJohn Birrell int ret = 0; 4786ff6d951SJohn Birrell uint_t nshdr; 4796ff6d951SJohn Birrell 4806ff6d951SJohn Birrell if (prepare_elf32(dtp, dof, &de) != 0) 4816ff6d951SJohn Birrell return (-1); /* errno is set for us */ 4826ff6d951SJohn Birrell 4836ff6d951SJohn Birrell /* 4846ff6d951SJohn Birrell * If there are no relocations, we only need enough sections for 4856ff6d951SJohn Birrell * the shstrtab and the DOF. 4866ff6d951SJohn Birrell */ 4876ff6d951SJohn Birrell nshdr = de.de_nrel == 0 ? ESHDR_SYMTAB + 1 : ESHDR_NUM; 4886ff6d951SJohn Birrell 4896ff6d951SJohn Birrell bzero(&elf_file, sizeof (elf_file)); 4906ff6d951SJohn Birrell 4916ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG0] = ELFMAG0; 4926ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG1] = ELFMAG1; 4936ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG2] = ELFMAG2; 4946ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG3] = ELFMAG3; 4956ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_VERSION] = EV_CURRENT; 4966ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_CLASS] = ELFCLASS32; 4972693feb4SJohn Birrell #if BYTE_ORDER == _BIG_ENDIAN 4986ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2MSB; 4992693feb4SJohn Birrell #else 5006ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2LSB; 5016ff6d951SJohn Birrell #endif 5022693feb4SJohn Birrell elf_file.ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 5036ff6d951SJohn Birrell elf_file.ehdr.e_type = ET_REL; 5042693feb4SJohn Birrell #if defined(__arm__) 5052693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_ARM; 5062693feb4SJohn Birrell #elif defined(__mips__) 5072693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_MIPS; 5082693feb4SJohn Birrell #elif defined(__powerpc__) 5092693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_PPC; 5106ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 5116ff6d951SJohn Birrell elf_file.ehdr.e_machine = EM_386; 512a2ea7849SMark Johnston #elif defined(__aarch64__) 513a2ea7849SMark Johnston elf_file.ehdr.e_machine = EM_AARCH64; 5146ff6d951SJohn Birrell #endif 5156ff6d951SJohn Birrell elf_file.ehdr.e_version = EV_CURRENT; 5166ff6d951SJohn Birrell elf_file.ehdr.e_shoff = sizeof (Elf32_Ehdr); 5176ff6d951SJohn Birrell elf_file.ehdr.e_ehsize = sizeof (Elf32_Ehdr); 5186ff6d951SJohn Birrell elf_file.ehdr.e_phentsize = sizeof (Elf32_Phdr); 5196ff6d951SJohn Birrell elf_file.ehdr.e_shentsize = sizeof (Elf32_Shdr); 5206ff6d951SJohn Birrell elf_file.ehdr.e_shnum = nshdr; 5216ff6d951SJohn Birrell elf_file.ehdr.e_shstrndx = ESHDR_SHSTRTAB; 5226ff6d951SJohn Birrell off = sizeof (elf_file) + nshdr * sizeof (Elf32_Shdr); 5236ff6d951SJohn Birrell 5246ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SHSTRTAB]; 5256ff6d951SJohn Birrell shp->sh_name = 1; /* DTRACE_SHSTRTAB32[1] = ".shstrtab" */ 5266ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 5276ff6d951SJohn Birrell shp->sh_offset = off; 5286ff6d951SJohn Birrell shp->sh_size = sizeof (DTRACE_SHSTRTAB32); 5296ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 5300e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 8); 5316ff6d951SJohn Birrell 5326ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_DOF]; 5336ff6d951SJohn Birrell shp->sh_name = 11; /* DTRACE_SHSTRTAB32[11] = ".SUNW_dof" */ 5346ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 5356ff6d951SJohn Birrell shp->sh_type = SHT_SUNW_dof; 5366ff6d951SJohn Birrell shp->sh_offset = off; 5376ff6d951SJohn Birrell shp->sh_size = dof->dofh_filesz; 5386ff6d951SJohn Birrell shp->sh_addralign = 8; 5396ff6d951SJohn Birrell off = shp->sh_offset + shp->sh_size; 5406ff6d951SJohn Birrell 5416ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_STRTAB]; 5426ff6d951SJohn Birrell shp->sh_name = 21; /* DTRACE_SHSTRTAB32[21] = ".strtab" */ 5436ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 5446ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 5456ff6d951SJohn Birrell shp->sh_offset = off; 5466ff6d951SJohn Birrell shp->sh_size = de.de_strlen; 5476ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 5480e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 4); 5496ff6d951SJohn Birrell 5506ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SYMTAB]; 5516ff6d951SJohn Birrell shp->sh_name = 29; /* DTRACE_SHSTRTAB32[29] = ".symtab" */ 5526ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 5536ff6d951SJohn Birrell shp->sh_type = SHT_SYMTAB; 5546ff6d951SJohn Birrell shp->sh_entsize = sizeof (Elf32_Sym); 5556ff6d951SJohn Birrell shp->sh_link = ESHDR_STRTAB; 5566ff6d951SJohn Birrell shp->sh_offset = off; 5576ff6d951SJohn Birrell shp->sh_info = de.de_global; 5586ff6d951SJohn Birrell shp->sh_size = de.de_nsym * sizeof (Elf32_Sym); 5596ff6d951SJohn Birrell shp->sh_addralign = 4; 5600e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 4); 5616ff6d951SJohn Birrell 5626ff6d951SJohn Birrell if (de.de_nrel == 0) { 5636ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 5646ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 5656ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB32) || 5666ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 5676ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 5686ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 5696ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 5706ff6d951SJohn Birrell } 5716ff6d951SJohn Birrell } else { 5726ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_REL]; 5736ff6d951SJohn Birrell shp->sh_name = 37; /* DTRACE_SHSTRTAB32[37] = ".rel.SUNW_dof" */ 5746ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 5756ff6d951SJohn Birrell shp->sh_type = SHT_REL; 5766ff6d951SJohn Birrell shp->sh_entsize = sizeof (de.de_rel[0]); 5776ff6d951SJohn Birrell shp->sh_link = ESHDR_SYMTAB; 5786ff6d951SJohn Birrell shp->sh_info = ESHDR_DOF; 5796ff6d951SJohn Birrell shp->sh_offset = off; 5806ff6d951SJohn Birrell shp->sh_size = de.de_nrel * sizeof (de.de_rel[0]); 5816ff6d951SJohn Birrell shp->sh_addralign = 4; 5826ff6d951SJohn Birrell 5836ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 5846ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 5856ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB32) || 5866ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 5876ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 5886ff6d951SJohn Birrell PWRITE_SCN(ESHDR_REL, de.de_rel) || 5896ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 5906ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 5916ff6d951SJohn Birrell } 5926ff6d951SJohn Birrell } 5936ff6d951SJohn Birrell 5946ff6d951SJohn Birrell free(de.de_strtab); 5956ff6d951SJohn Birrell free(de.de_sym); 5966ff6d951SJohn Birrell free(de.de_rel); 5976ff6d951SJohn Birrell 5986ff6d951SJohn Birrell return (ret); 5996ff6d951SJohn Birrell } 6006ff6d951SJohn Birrell 6016ff6d951SJohn Birrell /* 6026ff6d951SJohn Birrell * Write out an ELF64 file prologue consisting of a header, section headers, 6036ff6d951SJohn Birrell * and a section header string table. The DOF data will follow this prologue 6046ff6d951SJohn Birrell * and complete the contents of the given ELF file. 6056ff6d951SJohn Birrell */ 6066ff6d951SJohn Birrell static int 6076ff6d951SJohn Birrell dump_elf64(dtrace_hdl_t *dtp, const dof_hdr_t *dof, int fd) 6086ff6d951SJohn Birrell { 6096ff6d951SJohn Birrell struct { 6106ff6d951SJohn Birrell Elf64_Ehdr ehdr; 6116ff6d951SJohn Birrell Elf64_Shdr shdr[ESHDR_NUM]; 6126ff6d951SJohn Birrell } elf_file; 6136ff6d951SJohn Birrell 6146ff6d951SJohn Birrell Elf64_Shdr *shp; 6156ff6d951SJohn Birrell Elf64_Off off; 6166ff6d951SJohn Birrell dof_elf64_t de; 6176ff6d951SJohn Birrell int ret = 0; 6186ff6d951SJohn Birrell uint_t nshdr; 6196ff6d951SJohn Birrell 6206ff6d951SJohn Birrell if (prepare_elf64(dtp, dof, &de) != 0) 6216ff6d951SJohn Birrell return (-1); /* errno is set for us */ 6226ff6d951SJohn Birrell 6236ff6d951SJohn Birrell /* 6246ff6d951SJohn Birrell * If there are no relocations, we only need enough sections for 6256ff6d951SJohn Birrell * the shstrtab and the DOF. 6266ff6d951SJohn Birrell */ 6276ff6d951SJohn Birrell nshdr = de.de_nrel == 0 ? ESHDR_SYMTAB + 1 : ESHDR_NUM; 6286ff6d951SJohn Birrell 6296ff6d951SJohn Birrell bzero(&elf_file, sizeof (elf_file)); 6306ff6d951SJohn Birrell 6316ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG0] = ELFMAG0; 6326ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG1] = ELFMAG1; 6336ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG2] = ELFMAG2; 6346ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG3] = ELFMAG3; 6356ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_VERSION] = EV_CURRENT; 6366ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_CLASS] = ELFCLASS64; 6372693feb4SJohn Birrell #if BYTE_ORDER == _BIG_ENDIAN 6386ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2MSB; 6392693feb4SJohn Birrell #else 6406ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2LSB; 6416ff6d951SJohn Birrell #endif 6422693feb4SJohn Birrell elf_file.ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 6436ff6d951SJohn Birrell elf_file.ehdr.e_type = ET_REL; 6442693feb4SJohn Birrell #if defined(__arm__) 6452693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_ARM; 6462693feb4SJohn Birrell #elif defined(__mips__) 6472693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_MIPS; 648b08e2b04SJustin Hibbits #elif defined(__powerpc64__) 6497283901aSBrandon Bergren #if defined(_CALL_ELF) && _CALL_ELF == 2 6507283901aSBrandon Bergren elf_file.ehdr.e_flags = 2; 6517283901aSBrandon Bergren #endif 652b08e2b04SJustin Hibbits elf_file.ehdr.e_machine = EM_PPC64; 6536ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 6546ff6d951SJohn Birrell elf_file.ehdr.e_machine = EM_AMD64; 655a2ea7849SMark Johnston #elif defined(__aarch64__) 656a2ea7849SMark Johnston elf_file.ehdr.e_machine = EM_AARCH64; 6576ff6d951SJohn Birrell #endif 6586ff6d951SJohn Birrell elf_file.ehdr.e_version = EV_CURRENT; 6596ff6d951SJohn Birrell elf_file.ehdr.e_shoff = sizeof (Elf64_Ehdr); 6606ff6d951SJohn Birrell elf_file.ehdr.e_ehsize = sizeof (Elf64_Ehdr); 6616ff6d951SJohn Birrell elf_file.ehdr.e_phentsize = sizeof (Elf64_Phdr); 6626ff6d951SJohn Birrell elf_file.ehdr.e_shentsize = sizeof (Elf64_Shdr); 6636ff6d951SJohn Birrell elf_file.ehdr.e_shnum = nshdr; 6646ff6d951SJohn Birrell elf_file.ehdr.e_shstrndx = ESHDR_SHSTRTAB; 6656ff6d951SJohn Birrell off = sizeof (elf_file) + nshdr * sizeof (Elf64_Shdr); 6666ff6d951SJohn Birrell 6676ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SHSTRTAB]; 6686ff6d951SJohn Birrell shp->sh_name = 1; /* DTRACE_SHSTRTAB64[1] = ".shstrtab" */ 6696ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 6706ff6d951SJohn Birrell shp->sh_offset = off; 6716ff6d951SJohn Birrell shp->sh_size = sizeof (DTRACE_SHSTRTAB64); 6726ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 6730e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 8); 6746ff6d951SJohn Birrell 6756ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_DOF]; 6766ff6d951SJohn Birrell shp->sh_name = 11; /* DTRACE_SHSTRTAB64[11] = ".SUNW_dof" */ 6776ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 6786ff6d951SJohn Birrell shp->sh_type = SHT_SUNW_dof; 6796ff6d951SJohn Birrell shp->sh_offset = off; 6806ff6d951SJohn Birrell shp->sh_size = dof->dofh_filesz; 6816ff6d951SJohn Birrell shp->sh_addralign = 8; 6826ff6d951SJohn Birrell off = shp->sh_offset + shp->sh_size; 6836ff6d951SJohn Birrell 6846ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_STRTAB]; 6856ff6d951SJohn Birrell shp->sh_name = 21; /* DTRACE_SHSTRTAB64[21] = ".strtab" */ 6866ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 6876ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 6886ff6d951SJohn Birrell shp->sh_offset = off; 6896ff6d951SJohn Birrell shp->sh_size = de.de_strlen; 6906ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 6910e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 8); 6926ff6d951SJohn Birrell 6936ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SYMTAB]; 6946ff6d951SJohn Birrell shp->sh_name = 29; /* DTRACE_SHSTRTAB64[29] = ".symtab" */ 6956ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 6966ff6d951SJohn Birrell shp->sh_type = SHT_SYMTAB; 6976ff6d951SJohn Birrell shp->sh_entsize = sizeof (Elf64_Sym); 6986ff6d951SJohn Birrell shp->sh_link = ESHDR_STRTAB; 6996ff6d951SJohn Birrell shp->sh_offset = off; 7006ff6d951SJohn Birrell shp->sh_info = de.de_global; 7016ff6d951SJohn Birrell shp->sh_size = de.de_nsym * sizeof (Elf64_Sym); 7026ff6d951SJohn Birrell shp->sh_addralign = 8; 7030e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 8); 7046ff6d951SJohn Birrell 7056ff6d951SJohn Birrell if (de.de_nrel == 0) { 7066ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 7076ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 7086ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB64) || 7096ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 7106ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 7116ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 7126ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 7136ff6d951SJohn Birrell } 7146ff6d951SJohn Birrell } else { 7156ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_REL]; 7166ff6d951SJohn Birrell shp->sh_name = 37; /* DTRACE_SHSTRTAB64[37] = ".rel.SUNW_dof" */ 7176ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 7186ff6d951SJohn Birrell shp->sh_type = SHT_RELA; 7196ff6d951SJohn Birrell shp->sh_entsize = sizeof (de.de_rel[0]); 7206ff6d951SJohn Birrell shp->sh_link = ESHDR_SYMTAB; 7216ff6d951SJohn Birrell shp->sh_info = ESHDR_DOF; 7226ff6d951SJohn Birrell shp->sh_offset = off; 7236ff6d951SJohn Birrell shp->sh_size = de.de_nrel * sizeof (de.de_rel[0]); 7246ff6d951SJohn Birrell shp->sh_addralign = 8; 7256ff6d951SJohn Birrell 7266ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 7276ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 7286ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB64) || 7296ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 7306ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 7316ff6d951SJohn Birrell PWRITE_SCN(ESHDR_REL, de.de_rel) || 7326ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 7336ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 7346ff6d951SJohn Birrell } 7356ff6d951SJohn Birrell } 7366ff6d951SJohn Birrell 7376ff6d951SJohn Birrell free(de.de_strtab); 7386ff6d951SJohn Birrell free(de.de_sym); 7396ff6d951SJohn Birrell free(de.de_rel); 7406ff6d951SJohn Birrell 7416ff6d951SJohn Birrell return (ret); 7426ff6d951SJohn Birrell } 7436ff6d951SJohn Birrell 7446ff6d951SJohn Birrell static int 745e801af6fSMark Johnston dt_symtab_lookup(Elf_Data *data_sym, int start, int end, uintptr_t addr, 746e801af6fSMark Johnston uint_t shn, GElf_Sym *sym, int uses_funcdesc, Elf *elf) 7476ff6d951SJohn Birrell { 748b08e2b04SJustin Hibbits Elf64_Addr symval; 749b08e2b04SJustin Hibbits Elf_Scn *opd_scn; 750b08e2b04SJustin Hibbits Elf_Data *opd_desc; 751e801af6fSMark Johnston int i; 7526ff6d951SJohn Birrell 753e801af6fSMark Johnston for (i = start; i < end && gelf_getsym(data_sym, i, sym) != NULL; i++) { 754b08e2b04SJustin Hibbits if (GELF_ST_TYPE(sym->st_info) == STT_FUNC) { 755b08e2b04SJustin Hibbits symval = sym->st_value; 756b08e2b04SJustin Hibbits if (uses_funcdesc) { 757b08e2b04SJustin Hibbits opd_scn = elf_getscn(elf, sym->st_shndx); 758b08e2b04SJustin Hibbits opd_desc = elf_rawdata(opd_scn, NULL); 759b08e2b04SJustin Hibbits symval = 760b08e2b04SJustin Hibbits *(uint64_t*)((char *)opd_desc->d_buf + symval); 761b08e2b04SJustin Hibbits } 762b08e2b04SJustin Hibbits if ((uses_funcdesc || shn == sym->st_shndx) && 763e801af6fSMark Johnston symval <= addr && addr < symval + sym->st_size) 7646ff6d951SJohn Birrell return (0); 7656ff6d951SJohn Birrell } 766b08e2b04SJustin Hibbits } 7676ff6d951SJohn Birrell 768e801af6fSMark Johnston return (-1); 7696ff6d951SJohn Birrell } 7706ff6d951SJohn Birrell 771b78ee15eSRuslan Bukin #if defined(__aarch64__) 772a2ea7849SMark Johnston #define DT_OP_NOP 0xd503201f 773a2ea7849SMark Johnston #define DT_OP_RET 0xd65f03c0 774a2ea7849SMark Johnston #define DT_OP_CALL26 0x94000000 775a2ea7849SMark Johnston #define DT_OP_JUMP26 0x14000000 776e627909dSMark Johnston #define DT_REL_NONE R_AARCH64_NONE 777a2ea7849SMark Johnston 778b78ee15eSRuslan Bukin static int 779b78ee15eSRuslan Bukin dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 780b78ee15eSRuslan Bukin uint32_t *off) 781b78ee15eSRuslan Bukin { 782a2ea7849SMark Johnston uint32_t *ip; 783a2ea7849SMark Johnston 784a2ea7849SMark Johnston /* 785a2ea7849SMark Johnston * Ensure that the offset is aligned on an instruction boundary. 786a2ea7849SMark Johnston */ 787a2ea7849SMark Johnston if ((rela->r_offset & (sizeof (uint32_t) - 1)) != 0) 7884e4805ddSEd Maste return (-1); 789a2ea7849SMark Johnston 790a2ea7849SMark Johnston /* 791a2ea7849SMark Johnston * We only know about some specific relocation types. 792a2ea7849SMark Johnston * We also recognize relocation type NONE, since that gets used for 793a2ea7849SMark Johnston * relocations of USDT probes, and we might be re-processing a file. 794a2ea7849SMark Johnston */ 795a2ea7849SMark Johnston if (GELF_R_TYPE(rela->r_info) != R_AARCH64_CALL26 && 796a2ea7849SMark Johnston GELF_R_TYPE(rela->r_info) != R_AARCH64_JUMP26 && 797a2ea7849SMark Johnston GELF_R_TYPE(rela->r_info) != R_AARCH64_NONE) 798a2ea7849SMark Johnston return (-1); 799a2ea7849SMark Johnston 800a2ea7849SMark Johnston ip = (uint32_t *)(p + rela->r_offset); 801a2ea7849SMark Johnston 802a2ea7849SMark Johnston /* 803a2ea7849SMark Johnston * We may have already processed this object file in an earlier linker 804a2ea7849SMark Johnston * invocation. Check to see if the present instruction sequence matches 805a2ea7849SMark Johnston * the one we would install below. 806a2ea7849SMark Johnston */ 807a2ea7849SMark Johnston if (ip[0] == DT_OP_NOP || ip[0] == DT_OP_RET) 808a2ea7849SMark Johnston return (0); 809a2ea7849SMark Johnston 810a2ea7849SMark Johnston /* 811a2ea7849SMark Johnston * We only expect call instructions with a displacement of 0, or a jump 812a2ea7849SMark Johnston * instruction acting as a tail call. 813a2ea7849SMark Johnston */ 814a2ea7849SMark Johnston if (ip[0] != DT_OP_CALL26 && ip[0] != DT_OP_JUMP26) { 815a2ea7849SMark Johnston dt_dprintf("found %x instead of a call or jmp instruction at " 816a2ea7849SMark Johnston "%llx\n", ip[0], (u_longlong_t)rela->r_offset); 817a2ea7849SMark Johnston return (-1); 818a2ea7849SMark Johnston } 819a2ea7849SMark Johnston 820a2ea7849SMark Johnston /* 821a2ea7849SMark Johnston * On arm64, we do not have to differentiate between regular probes and 822a2ea7849SMark Johnston * is-enabled probes. Both cases are encoded as a regular branch for 823a2ea7849SMark Johnston * non-tail call locations, and a jump for tail call locations. Calls 824a2ea7849SMark Johnston * are to be converted into a no-op whereas jumps should become a 825a2ea7849SMark Johnston * return. 826a2ea7849SMark Johnston */ 827a2ea7849SMark Johnston if (ip[0] == DT_OP_CALL26) 828a2ea7849SMark Johnston ip[0] = DT_OP_NOP; 829a2ea7849SMark Johnston else 830a2ea7849SMark Johnston ip[0] = DT_OP_RET; 831a2ea7849SMark Johnston 832a2ea7849SMark Johnston return (0); 833b78ee15eSRuslan Bukin } 834b78ee15eSRuslan Bukin #elif defined(__arm__) 835d2d16e56SMark Johnston #define DT_REL_NONE R_ARM_NONE 836d2d16e56SMark Johnston 8372693feb4SJohn Birrell static int 8382693feb4SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 8392693feb4SJohn Birrell uint32_t *off) 8402693feb4SJohn Birrell { 841732f2c69SEd Maste printf("%s:%s(%d): arm not implemented\n", __FUNCTION__, __FILE__, 842732f2c69SEd Maste __LINE__); 8434e4805ddSEd Maste return (-1); 8442693feb4SJohn Birrell } 8452693feb4SJohn Birrell #elif defined(__mips__) 846d2d16e56SMark Johnston #define DT_REL_NONE R_MIPS_NONE 847d2d16e56SMark Johnston 8482693feb4SJohn Birrell static int 8492693feb4SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 8502693feb4SJohn Birrell uint32_t *off) 8512693feb4SJohn Birrell { 852732f2c69SEd Maste printf("%s:%s(%d): MIPS not implemented\n", __FUNCTION__, __FILE__, 853732f2c69SEd Maste __LINE__); 8544e4805ddSEd Maste return (-1); 8552693feb4SJohn Birrell } 8562693feb4SJohn Birrell #elif defined(__powerpc__) 85730b318b9SJustin Hibbits /* The sentinel is 'xor r3,r3,r3'. */ 85830b318b9SJustin Hibbits #define DT_OP_XOR_R3 0x7c631a78 85930b318b9SJustin Hibbits 86030b318b9SJustin Hibbits #define DT_OP_NOP 0x60000000 86130b318b9SJustin Hibbits #define DT_OP_BLR 0x4e800020 86230b318b9SJustin Hibbits 86330b318b9SJustin Hibbits /* This captures all forms of branching to address. */ 86430b318b9SJustin Hibbits #define DT_IS_BRANCH(inst) ((inst & 0xfc000000) == 0x48000000) 86530b318b9SJustin Hibbits #define DT_IS_BL(inst) (DT_IS_BRANCH(inst) && (inst & 0x01)) 86630b318b9SJustin Hibbits 867d2d16e56SMark Johnston #define DT_REL_NONE R_PPC_NONE 868d2d16e56SMark Johnston 8692693feb4SJohn Birrell static int 8702693feb4SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 8712693feb4SJohn Birrell uint32_t *off) 8722693feb4SJohn Birrell { 87330b318b9SJustin Hibbits uint32_t *ip; 87430b318b9SJustin Hibbits 87530b318b9SJustin Hibbits if ((rela->r_offset & (sizeof (uint32_t) - 1)) != 0) 87630b318b9SJustin Hibbits return (-1); 87730b318b9SJustin Hibbits 87830b318b9SJustin Hibbits /*LINTED*/ 87930b318b9SJustin Hibbits ip = (uint32_t *)(p + rela->r_offset); 88030b318b9SJustin Hibbits 88130b318b9SJustin Hibbits /* 88230b318b9SJustin Hibbits * We only know about some specific relocation types. 88330b318b9SJustin Hibbits */ 88430b318b9SJustin Hibbits if (GELF_R_TYPE(rela->r_info) != R_PPC_REL24 && 885d2d16e56SMark Johnston GELF_R_TYPE(rela->r_info) != R_PPC_PLTREL24 && 886d2d16e56SMark Johnston GELF_R_TYPE(rela->r_info) != R_PPC_NONE) 88730b318b9SJustin Hibbits return (-1); 88830b318b9SJustin Hibbits 88930b318b9SJustin Hibbits /* 89030b318b9SJustin Hibbits * We may have already processed this object file in an earlier linker 89130b318b9SJustin Hibbits * invocation. Check to see if the present instruction sequence matches 89230b318b9SJustin Hibbits * the one we would install below. 89330b318b9SJustin Hibbits */ 89430b318b9SJustin Hibbits if (isenabled) { 89530b318b9SJustin Hibbits if (ip[0] == DT_OP_XOR_R3) { 89630b318b9SJustin Hibbits (*off) += sizeof (ip[0]); 89730b318b9SJustin Hibbits return (0); 89830b318b9SJustin Hibbits } 89930b318b9SJustin Hibbits } else { 90030b318b9SJustin Hibbits if (ip[0] == DT_OP_NOP) { 90130b318b9SJustin Hibbits (*off) += sizeof (ip[0]); 90230b318b9SJustin Hibbits return (0); 90330b318b9SJustin Hibbits } 90430b318b9SJustin Hibbits } 90530b318b9SJustin Hibbits 90630b318b9SJustin Hibbits /* 90730b318b9SJustin Hibbits * We only expect branch to address instructions. 90830b318b9SJustin Hibbits */ 90930b318b9SJustin Hibbits if (!DT_IS_BRANCH(ip[0])) { 91030b318b9SJustin Hibbits dt_dprintf("found %x instead of a branch instruction at %llx\n", 91130b318b9SJustin Hibbits ip[0], (u_longlong_t)rela->r_offset); 91230b318b9SJustin Hibbits return (-1); 91330b318b9SJustin Hibbits } 91430b318b9SJustin Hibbits 91530b318b9SJustin Hibbits if (isenabled) { 91630b318b9SJustin Hibbits /* 91730b318b9SJustin Hibbits * It would necessarily indicate incorrect usage if an is- 91830b318b9SJustin Hibbits * enabled probe were tail-called so flag that as an error. 91930b318b9SJustin Hibbits * It's also potentially (very) tricky to handle gracefully, 92030b318b9SJustin Hibbits * but could be done if this were a desired use scenario. 92130b318b9SJustin Hibbits */ 92230b318b9SJustin Hibbits if (!DT_IS_BL(ip[0])) { 92330b318b9SJustin Hibbits dt_dprintf("tail call to is-enabled probe at %llx\n", 92430b318b9SJustin Hibbits (u_longlong_t)rela->r_offset); 92530b318b9SJustin Hibbits return (-1); 92630b318b9SJustin Hibbits } 92730b318b9SJustin Hibbits 92830b318b9SJustin Hibbits ip[0] = DT_OP_XOR_R3; 92930b318b9SJustin Hibbits (*off) += sizeof (ip[0]); 93030b318b9SJustin Hibbits } else { 93130b318b9SJustin Hibbits if (DT_IS_BL(ip[0])) 93230b318b9SJustin Hibbits ip[0] = DT_OP_NOP; 93330b318b9SJustin Hibbits else 93430b318b9SJustin Hibbits ip[0] = DT_OP_BLR; 93530b318b9SJustin Hibbits } 93630b318b9SJustin Hibbits 9372693feb4SJohn Birrell return (0); 9382693feb4SJohn Birrell } 939ca20f8ecSRuslan Bukin #elif defined(__riscv) 940d2d16e56SMark Johnston #define DT_REL_NONE R_RISCV_NONE 941fed1ca4bSRuslan Bukin static int 942fed1ca4bSRuslan Bukin dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 943fed1ca4bSRuslan Bukin uint32_t *off) 944fed1ca4bSRuslan Bukin { 945732f2c69SEd Maste printf("%s:%s(%d): RISC-V implementation required\n", __FUNCTION__, 946732f2c69SEd Maste __FILE__, __LINE__); 9474e4805ddSEd Maste return (-1); 948fed1ca4bSRuslan Bukin } 9496ff6d951SJohn Birrell 9506ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 9516ff6d951SJohn Birrell 9526ff6d951SJohn Birrell #define DT_OP_NOP 0x90 9532693feb4SJohn Birrell #define DT_OP_RET 0xc3 9546ff6d951SJohn Birrell #define DT_OP_CALL 0xe8 9552693feb4SJohn Birrell #define DT_OP_JMP32 0xe9 9566ff6d951SJohn Birrell #define DT_OP_REX_RAX 0x48 9576ff6d951SJohn Birrell #define DT_OP_XOR_EAX_0 0x33 9586ff6d951SJohn Birrell #define DT_OP_XOR_EAX_1 0xc0 9596ff6d951SJohn Birrell 960d2d16e56SMark Johnston #define DT_REL_NONE R_386_NONE 961d2d16e56SMark Johnston 9626ff6d951SJohn Birrell static int 9636ff6d951SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 9646ff6d951SJohn Birrell uint32_t *off) 9656ff6d951SJohn Birrell { 9666ff6d951SJohn Birrell uint8_t *ip = (uint8_t *)(p + rela->r_offset - 1); 9672693feb4SJohn Birrell uint8_t ret; 9686ff6d951SJohn Birrell 9696ff6d951SJohn Birrell /* 9706ff6d951SJohn Birrell * On x86, the first byte of the instruction is the call opcode and 9716ff6d951SJohn Birrell * the next four bytes are the 32-bit address; the relocation is for 9726ff6d951SJohn Birrell * the address operand. We back up the offset to the first byte of 9736ff6d951SJohn Birrell * the instruction. For is-enabled probes, we later advance the offset 9746ff6d951SJohn Birrell * so that it hits the first nop in the instruction sequence. 9756ff6d951SJohn Birrell */ 9766ff6d951SJohn Birrell (*off) -= 1; 9776ff6d951SJohn Birrell 9786ff6d951SJohn Birrell /* 9796ff6d951SJohn Birrell * We only know about some specific relocation types. Luckily 9806ff6d951SJohn Birrell * these types have the same values on both 32-bit and 64-bit 9816ff6d951SJohn Birrell * x86 architectures. 9826ff6d951SJohn Birrell */ 9836ff6d951SJohn Birrell if (GELF_R_TYPE(rela->r_info) != R_386_PC32 && 984d2d16e56SMark Johnston GELF_R_TYPE(rela->r_info) != R_386_PLT32 && 985d2d16e56SMark Johnston GELF_R_TYPE(rela->r_info) != R_386_NONE) 9866ff6d951SJohn Birrell return (-1); 9876ff6d951SJohn Birrell 9886ff6d951SJohn Birrell /* 9896ff6d951SJohn Birrell * We may have already processed this object file in an earlier linker 9906ff6d951SJohn Birrell * invocation. Check to see if the present instruction sequence matches 9916ff6d951SJohn Birrell * the one we would install. For is-enabled probes, we advance the 9922693feb4SJohn Birrell * offset to the first nop instruction in the sequence to match the 9932693feb4SJohn Birrell * text modification code below. 9946ff6d951SJohn Birrell */ 9956ff6d951SJohn Birrell if (!isenabled) { 9962693feb4SJohn Birrell if ((ip[0] == DT_OP_NOP || ip[0] == DT_OP_RET) && 9972693feb4SJohn Birrell ip[1] == DT_OP_NOP && ip[2] == DT_OP_NOP && 9982693feb4SJohn Birrell ip[3] == DT_OP_NOP && ip[4] == DT_OP_NOP) 9996ff6d951SJohn Birrell return (0); 10006ff6d951SJohn Birrell } else if (dtp->dt_oflags & DTRACE_O_LP64) { 10016ff6d951SJohn Birrell if (ip[0] == DT_OP_REX_RAX && 10026ff6d951SJohn Birrell ip[1] == DT_OP_XOR_EAX_0 && ip[2] == DT_OP_XOR_EAX_1 && 10032693feb4SJohn Birrell (ip[3] == DT_OP_NOP || ip[3] == DT_OP_RET) && 10042693feb4SJohn Birrell ip[4] == DT_OP_NOP) { 10056ff6d951SJohn Birrell (*off) += 3; 10066ff6d951SJohn Birrell return (0); 10076ff6d951SJohn Birrell } 10086ff6d951SJohn Birrell } else { 10096ff6d951SJohn Birrell if (ip[0] == DT_OP_XOR_EAX_0 && ip[1] == DT_OP_XOR_EAX_1 && 10102693feb4SJohn Birrell (ip[2] == DT_OP_NOP || ip[2] == DT_OP_RET) && 10112693feb4SJohn Birrell ip[3] == DT_OP_NOP && ip[4] == DT_OP_NOP) { 10126ff6d951SJohn Birrell (*off) += 2; 10136ff6d951SJohn Birrell return (0); 10146ff6d951SJohn Birrell } 10156ff6d951SJohn Birrell } 10166ff6d951SJohn Birrell 10176ff6d951SJohn Birrell /* 10182693feb4SJohn Birrell * We expect either a call instrution with a 32-bit displacement or a 10192693feb4SJohn Birrell * jmp instruction with a 32-bit displacement acting as a tail-call. 10206ff6d951SJohn Birrell */ 10212693feb4SJohn Birrell if (ip[0] != DT_OP_CALL && ip[0] != DT_OP_JMP32) { 10222693feb4SJohn Birrell dt_dprintf("found %x instead of a call or jmp instruction at " 10232693feb4SJohn Birrell "%llx\n", ip[0], (u_longlong_t)rela->r_offset); 10246ff6d951SJohn Birrell return (-1); 10256ff6d951SJohn Birrell } 10266ff6d951SJohn Birrell 10272693feb4SJohn Birrell ret = (ip[0] == DT_OP_JMP32) ? DT_OP_RET : DT_OP_NOP; 10282693feb4SJohn Birrell 10296ff6d951SJohn Birrell /* 10306ff6d951SJohn Birrell * Establish the instruction sequence -- all nops for probes, and an 10316ff6d951SJohn Birrell * instruction to clear the return value register (%eax/%rax) followed 10326ff6d951SJohn Birrell * by nops for is-enabled probes. For is-enabled probes, we advance 10336ff6d951SJohn Birrell * the offset to the first nop. This isn't stricly necessary but makes 10346ff6d951SJohn Birrell * for more readable disassembly when the probe is enabled. 10356ff6d951SJohn Birrell */ 10366ff6d951SJohn Birrell if (!isenabled) { 10372693feb4SJohn Birrell ip[0] = ret; 10386ff6d951SJohn Birrell ip[1] = DT_OP_NOP; 10396ff6d951SJohn Birrell ip[2] = DT_OP_NOP; 10406ff6d951SJohn Birrell ip[3] = DT_OP_NOP; 10416ff6d951SJohn Birrell ip[4] = DT_OP_NOP; 10426ff6d951SJohn Birrell } else if (dtp->dt_oflags & DTRACE_O_LP64) { 10436ff6d951SJohn Birrell ip[0] = DT_OP_REX_RAX; 10446ff6d951SJohn Birrell ip[1] = DT_OP_XOR_EAX_0; 10456ff6d951SJohn Birrell ip[2] = DT_OP_XOR_EAX_1; 10462693feb4SJohn Birrell ip[3] = ret; 10476ff6d951SJohn Birrell ip[4] = DT_OP_NOP; 10486ff6d951SJohn Birrell (*off) += 3; 10496ff6d951SJohn Birrell } else { 10506ff6d951SJohn Birrell ip[0] = DT_OP_XOR_EAX_0; 10516ff6d951SJohn Birrell ip[1] = DT_OP_XOR_EAX_1; 10522693feb4SJohn Birrell ip[2] = ret; 10536ff6d951SJohn Birrell ip[3] = DT_OP_NOP; 10546ff6d951SJohn Birrell ip[4] = DT_OP_NOP; 10556ff6d951SJohn Birrell (*off) += 2; 10566ff6d951SJohn Birrell } 10576ff6d951SJohn Birrell 10586ff6d951SJohn Birrell return (0); 10596ff6d951SJohn Birrell } 10606ff6d951SJohn Birrell 10616ff6d951SJohn Birrell #else 10626ff6d951SJohn Birrell #error unknown ISA 10636ff6d951SJohn Birrell #endif 10646ff6d951SJohn Birrell 10656ff6d951SJohn Birrell /*PRINTFLIKE5*/ 10666ff6d951SJohn Birrell static int 10676ff6d951SJohn Birrell dt_link_error(dtrace_hdl_t *dtp, Elf *elf, int fd, dt_link_pair_t *bufs, 10686ff6d951SJohn Birrell const char *format, ...) 10696ff6d951SJohn Birrell { 10706ff6d951SJohn Birrell va_list ap; 10716ff6d951SJohn Birrell dt_link_pair_t *pair; 10726ff6d951SJohn Birrell 10736ff6d951SJohn Birrell va_start(ap, format); 10746ff6d951SJohn Birrell dt_set_errmsg(dtp, NULL, NULL, NULL, 0, format, ap); 10756ff6d951SJohn Birrell va_end(ap); 10766ff6d951SJohn Birrell 10776ff6d951SJohn Birrell if (elf != NULL) 10786ff6d951SJohn Birrell (void) elf_end(elf); 10796ff6d951SJohn Birrell 10806ff6d951SJohn Birrell if (fd >= 0) 10816ff6d951SJohn Birrell (void) close(fd); 10826ff6d951SJohn Birrell 10836ff6d951SJohn Birrell while ((pair = bufs) != NULL) { 10846ff6d951SJohn Birrell bufs = pair->dlp_next; 10856ff6d951SJohn Birrell dt_free(dtp, pair->dlp_str); 10866ff6d951SJohn Birrell dt_free(dtp, pair->dlp_sym); 10876ff6d951SJohn Birrell dt_free(dtp, pair); 10886ff6d951SJohn Birrell } 10896ff6d951SJohn Birrell 10906ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_COMPILER)); 10916ff6d951SJohn Birrell } 10926ff6d951SJohn Birrell 1093938acb08SMark Johnston /* 1094938acb08SMark Johnston * Provide a unique identifier used when adding global symbols to an object. 1095938acb08SMark Johnston * This is the FNV-1a hash of an absolute path for the file. 1096938acb08SMark Johnston */ 1097938acb08SMark Johnston static unsigned int 1098938acb08SMark Johnston hash_obj(const char *obj, int fd) 1099938acb08SMark Johnston { 1100938acb08SMark Johnston char path[PATH_MAX]; 1101938acb08SMark Johnston unsigned int h; 1102938acb08SMark Johnston 1103938acb08SMark Johnston if (realpath(obj, path) == NULL) 1104938acb08SMark Johnston return (-1); 1105938acb08SMark Johnston 1106938acb08SMark Johnston for (h = 2166136261u, obj = &path[0]; *obj != '\0'; obj++) 1107938acb08SMark Johnston h = (h ^ *obj) * 16777619; 1108938acb08SMark Johnston h &= 0x7fffffff; 1109938acb08SMark Johnston return (h); 1110938acb08SMark Johnston } 1111938acb08SMark Johnston 11126ff6d951SJohn Birrell static int 11136ff6d951SJohn Birrell process_obj(dtrace_hdl_t *dtp, const char *obj, int *eprobesp) 11146ff6d951SJohn Birrell { 11156ff6d951SJohn Birrell static const char dt_prefix[] = "__dtrace"; 11166ff6d951SJohn Birrell static const char dt_enabled[] = "enabled"; 11176ff6d951SJohn Birrell static const char dt_symprefix[] = "$dtrace"; 1118938acb08SMark Johnston static const char dt_symfmt[] = "%s%u.%s"; 1119281e4f2dSMark Johnston static const char dt_weaksymfmt[] = "%s.%s"; 11203a3e3279SMark Johnston char probename[DTRACE_NAMELEN]; 11217283901aSBrandon Bergren int fd, i, ndx, eprobe, uses_funcdesc = 0, mod = 0; 11226ff6d951SJohn Birrell Elf *elf = NULL; 11236ff6d951SJohn Birrell GElf_Ehdr ehdr; 11246ff6d951SJohn Birrell Elf_Scn *scn_rel, *scn_sym, *scn_str, *scn_tgt; 11256ff6d951SJohn Birrell Elf_Data *data_rel, *data_sym, *data_str, *data_tgt; 11266ff6d951SJohn Birrell GElf_Shdr shdr_rel, shdr_sym, shdr_str, shdr_tgt; 11276ff6d951SJohn Birrell GElf_Sym rsym, fsym, dsym; 11286ff6d951SJohn Birrell GElf_Rela rela; 11296ff6d951SJohn Birrell char *s, *p, *r; 11306ff6d951SJohn Birrell char pname[DTRACE_PROVNAMELEN]; 11316ff6d951SJohn Birrell dt_provider_t *pvp; 11326ff6d951SJohn Birrell dt_probe_t *prp; 11336ff6d951SJohn Birrell uint32_t off, eclass, emachine1, emachine2; 1134e801af6fSMark Johnston size_t symsize, osym, nsym, isym, istr, len; 1135938acb08SMark Johnston unsigned int objkey; 11366ff6d951SJohn Birrell dt_link_pair_t *pair, *bufs = NULL; 11376ff6d951SJohn Birrell dt_strtab_t *strtab; 1138273efb05SMark Johnston void *tmp; 11396ff6d951SJohn Birrell 11406ff6d951SJohn Birrell if ((fd = open64(obj, O_RDWR)) == -1) { 11416ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 11426ff6d951SJohn Birrell "failed to open %s: %s", obj, strerror(errno))); 11436ff6d951SJohn Birrell } 11446ff6d951SJohn Birrell 11456ff6d951SJohn Birrell if ((elf = elf_begin(fd, ELF_C_RDWR, NULL)) == NULL) { 11466ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 11476ff6d951SJohn Birrell "failed to process %s: %s", obj, elf_errmsg(elf_errno()))); 11486ff6d951SJohn Birrell } 11496ff6d951SJohn Birrell 11506ff6d951SJohn Birrell switch (elf_kind(elf)) { 11516ff6d951SJohn Birrell case ELF_K_ELF: 11526ff6d951SJohn Birrell break; 11536ff6d951SJohn Birrell case ELF_K_AR: 11546ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, "archives are not " 11556ff6d951SJohn Birrell "permitted; use the contents of the archive instead: %s", 11566ff6d951SJohn Birrell obj)); 11576ff6d951SJohn Birrell default: 11586ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 11596ff6d951SJohn Birrell "invalid file type: %s", obj)); 11606ff6d951SJohn Birrell } 11616ff6d951SJohn Birrell 11626ff6d951SJohn Birrell if (gelf_getehdr(elf, &ehdr) == NULL) { 11636ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, "corrupt file: %s", 11646ff6d951SJohn Birrell obj)); 11656ff6d951SJohn Birrell } 11666ff6d951SJohn Birrell 11676ff6d951SJohn Birrell if (dtp->dt_oflags & DTRACE_O_LP64) { 11686ff6d951SJohn Birrell eclass = ELFCLASS64; 1169e7d939bdSMarcel Moolenaar #if defined(__mips__) 11702693feb4SJohn Birrell emachine1 = emachine2 = EM_MIPS; 11712693feb4SJohn Birrell #elif defined(__powerpc__) 11722693feb4SJohn Birrell emachine1 = emachine2 = EM_PPC64; 11737283901aSBrandon Bergren #if !defined(_CALL_ELF) || _CALL_ELF == 1 11747283901aSBrandon Bergren uses_funcdesc = 1; 11757283901aSBrandon Bergren #endif 11766ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 11776ff6d951SJohn Birrell emachine1 = emachine2 = EM_AMD64; 1178a2ea7849SMark Johnston #elif defined(__aarch64__) 1179a2ea7849SMark Johnston emachine1 = emachine2 = EM_AARCH64; 11806ff6d951SJohn Birrell #endif 11816ff6d951SJohn Birrell symsize = sizeof (Elf64_Sym); 11826ff6d951SJohn Birrell } else { 11836ff6d951SJohn Birrell eclass = ELFCLASS32; 11842693feb4SJohn Birrell #if defined(__arm__) 11852693feb4SJohn Birrell emachine1 = emachine2 = EM_ARM; 11862693feb4SJohn Birrell #elif defined(__mips__) 11872693feb4SJohn Birrell emachine1 = emachine2 = EM_MIPS; 11882693feb4SJohn Birrell #elif defined(__powerpc__) 11892693feb4SJohn Birrell emachine1 = emachine2 = EM_PPC; 1190e7d939bdSMarcel Moolenaar #elif defined(__i386) || defined(__amd64) 11916ff6d951SJohn Birrell emachine1 = emachine2 = EM_386; 11926ff6d951SJohn Birrell #endif 11936ff6d951SJohn Birrell symsize = sizeof (Elf32_Sym); 11946ff6d951SJohn Birrell } 11956ff6d951SJohn Birrell 11966ff6d951SJohn Birrell if (ehdr.e_ident[EI_CLASS] != eclass) { 11976ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 11986ff6d951SJohn Birrell "incorrect ELF class for object file: %s", obj)); 11996ff6d951SJohn Birrell } 12006ff6d951SJohn Birrell 12016ff6d951SJohn Birrell if (ehdr.e_machine != emachine1 && ehdr.e_machine != emachine2) { 12026ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 12036ff6d951SJohn Birrell "incorrect ELF machine type for object file: %s", obj)); 12046ff6d951SJohn Birrell } 12056ff6d951SJohn Birrell 12066ff6d951SJohn Birrell /* 12076ff6d951SJohn Birrell * We use this token as a relatively unique handle for this file on the 12086ff6d951SJohn Birrell * system in order to disambiguate potential conflicts between files of 12096ff6d951SJohn Birrell * the same name which contain identially named local symbols. 12106ff6d951SJohn Birrell */ 1211938acb08SMark Johnston if ((objkey = hash_obj(obj, fd)) == (unsigned int)-1) 12126ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 12136ff6d951SJohn Birrell "failed to generate unique key for object file: %s", obj)); 12146ff6d951SJohn Birrell 12156ff6d951SJohn Birrell scn_rel = NULL; 12166ff6d951SJohn Birrell while ((scn_rel = elf_nextscn(elf, scn_rel)) != NULL) { 12176ff6d951SJohn Birrell if (gelf_getshdr(scn_rel, &shdr_rel) == NULL) 12186ff6d951SJohn Birrell goto err; 12196ff6d951SJohn Birrell 12206ff6d951SJohn Birrell /* 12216ff6d951SJohn Birrell * Skip any non-relocation sections. 12226ff6d951SJohn Birrell */ 12236ff6d951SJohn Birrell if (shdr_rel.sh_type != SHT_RELA && shdr_rel.sh_type != SHT_REL) 12246ff6d951SJohn Birrell continue; 12256ff6d951SJohn Birrell 12266ff6d951SJohn Birrell if ((data_rel = elf_getdata(scn_rel, NULL)) == NULL) 12276ff6d951SJohn Birrell goto err; 12286ff6d951SJohn Birrell 12296ff6d951SJohn Birrell /* 12306ff6d951SJohn Birrell * Grab the section, section header and section data for the 12316ff6d951SJohn Birrell * symbol table that this relocation section references. 12326ff6d951SJohn Birrell */ 12336ff6d951SJohn Birrell if ((scn_sym = elf_getscn(elf, shdr_rel.sh_link)) == NULL || 12346ff6d951SJohn Birrell gelf_getshdr(scn_sym, &shdr_sym) == NULL || 12356ff6d951SJohn Birrell (data_sym = elf_getdata(scn_sym, NULL)) == NULL) 12366ff6d951SJohn Birrell goto err; 12376ff6d951SJohn Birrell 12386ff6d951SJohn Birrell /* 12396ff6d951SJohn Birrell * Ditto for that symbol table's string table. 12406ff6d951SJohn Birrell */ 12416ff6d951SJohn Birrell if ((scn_str = elf_getscn(elf, shdr_sym.sh_link)) == NULL || 12426ff6d951SJohn Birrell gelf_getshdr(scn_str, &shdr_str) == NULL || 12436ff6d951SJohn Birrell (data_str = elf_getdata(scn_str, NULL)) == NULL) 12446ff6d951SJohn Birrell goto err; 12456ff6d951SJohn Birrell 12466ff6d951SJohn Birrell /* 12476ff6d951SJohn Birrell * Grab the section, section header and section data for the 12486ff6d951SJohn Birrell * target section for the relocations. For the relocations 12496ff6d951SJohn Birrell * we're looking for -- this will typically be the text of the 12506ff6d951SJohn Birrell * object file. 12516ff6d951SJohn Birrell */ 12526ff6d951SJohn Birrell if ((scn_tgt = elf_getscn(elf, shdr_rel.sh_info)) == NULL || 12536ff6d951SJohn Birrell gelf_getshdr(scn_tgt, &shdr_tgt) == NULL || 12546ff6d951SJohn Birrell (data_tgt = elf_getdata(scn_tgt, NULL)) == NULL) 12556ff6d951SJohn Birrell goto err; 12566ff6d951SJohn Birrell 12576ff6d951SJohn Birrell /* 12586ff6d951SJohn Birrell * We're looking for relocations to symbols matching this form: 12596ff6d951SJohn Birrell * 12606ff6d951SJohn Birrell * __dtrace[enabled]_<prov>___<probe> 12616ff6d951SJohn Birrell * 12626ff6d951SJohn Birrell * For the generated object, we need to record the location 12636ff6d951SJohn Birrell * identified by the relocation, and create a new relocation 12646ff6d951SJohn Birrell * in the generated object that will be resolved at link time 12656ff6d951SJohn Birrell * to the location of the function in which the probe is 12666ff6d951SJohn Birrell * embedded. In the target object, we change the matched symbol 12676ff6d951SJohn Birrell * so that it will be ignored at link time, and we modify the 12686ff6d951SJohn Birrell * target (text) section to replace the call instruction with 12696ff6d951SJohn Birrell * one or more nops. 12706ff6d951SJohn Birrell * 1271e801af6fSMark Johnston * To avoid runtime overhead, the relocations added to the 1272e801af6fSMark Johnston * generated object should be resolved at static link time. We 1273e801af6fSMark Johnston * therefore create aliases for the functions that contain 1274e801af6fSMark Johnston * probes. An alias is global (so that the relocation from the 1275e801af6fSMark Johnston * generated object can be resolved), and hidden (so that its 1276e801af6fSMark Johnston * address is known at static link time). Such aliases have this 1277e801af6fSMark Johnston * form: 12786ff6d951SJohn Birrell * 12796ff6d951SJohn Birrell * $dtrace<key>.<function> 12806ff6d951SJohn Birrell * 12816ff6d951SJohn Birrell * We take a first pass through all the relocations to 12826ff6d951SJohn Birrell * populate our string table and count the number of extra 12836ff6d951SJohn Birrell * symbols we'll require. 1284d2d16e56SMark Johnston * 1285d2d16e56SMark Johnston * We also handle the case where the object has already been 1286d2d16e56SMark Johnston * processed, to support incremental rebuilds. Relocations 1287d2d16e56SMark Johnston * of interest are converted to type NONE, but all information 1288d2d16e56SMark Johnston * needed to reconstruct the output DOF is retained. 12896ff6d951SJohn Birrell */ 12906ff6d951SJohn Birrell strtab = dt_strtab_create(1); 12916ff6d951SJohn Birrell nsym = 0; 12926ff6d951SJohn Birrell isym = data_sym->d_size / symsize; 12936ff6d951SJohn Birrell istr = data_str->d_size; 12946ff6d951SJohn Birrell 12956ff6d951SJohn Birrell for (i = 0; i < shdr_rel.sh_size / shdr_rel.sh_entsize; i++) { 12966ff6d951SJohn Birrell if (shdr_rel.sh_type == SHT_RELA) { 12976ff6d951SJohn Birrell if (gelf_getrela(data_rel, i, &rela) == NULL) 12986ff6d951SJohn Birrell continue; 12996ff6d951SJohn Birrell } else { 13006ff6d951SJohn Birrell GElf_Rel rel; 13016ff6d951SJohn Birrell if (gelf_getrel(data_rel, i, &rel) == NULL) 13026ff6d951SJohn Birrell continue; 13036ff6d951SJohn Birrell rela.r_offset = rel.r_offset; 13046ff6d951SJohn Birrell rela.r_info = rel.r_info; 13056ff6d951SJohn Birrell rela.r_addend = 0; 13066ff6d951SJohn Birrell } 13076ff6d951SJohn Birrell 13086ff6d951SJohn Birrell if (gelf_getsym(data_sym, GELF_R_SYM(rela.r_info), 13096ff6d951SJohn Birrell &rsym) == NULL) { 13106ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13116ff6d951SJohn Birrell goto err; 13126ff6d951SJohn Birrell } 13136ff6d951SJohn Birrell 13146ff6d951SJohn Birrell s = (char *)data_str->d_buf + rsym.st_name; 13156ff6d951SJohn Birrell 13166ff6d951SJohn Birrell if (strncmp(s, dt_prefix, sizeof (dt_prefix) - 1) != 0) 13176ff6d951SJohn Birrell continue; 13186ff6d951SJohn Birrell 1319e801af6fSMark Johnston if (dt_symtab_lookup(data_sym, 0, isym, rela.r_offset, 13207283901aSBrandon Bergren shdr_rel.sh_info, &fsym, uses_funcdesc, 1321e801af6fSMark Johnston elf) != 0) { 13226ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13236ff6d951SJohn Birrell goto err; 13246ff6d951SJohn Birrell } 13256ff6d951SJohn Birrell 13266ff6d951SJohn Birrell if (fsym.st_name > data_str->d_size) { 13276ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13286ff6d951SJohn Birrell goto err; 13296ff6d951SJohn Birrell } 13306ff6d951SJohn Birrell 13316ff6d951SJohn Birrell s = (char *)data_str->d_buf + fsym.st_name; 13326ff6d951SJohn Birrell 13336ff6d951SJohn Birrell /* 13346ff6d951SJohn Birrell * If this symbol isn't of type function, we've really 13356ff6d951SJohn Birrell * driven off the rails or the object file is corrupt. 13366ff6d951SJohn Birrell */ 13376ff6d951SJohn Birrell if (GELF_ST_TYPE(fsym.st_info) != STT_FUNC) { 13386ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13396ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 13406ff6d951SJohn Birrell "expected %s to be of type function", s)); 13416ff6d951SJohn Birrell } 13426ff6d951SJohn Birrell 1343ad1633b3SMark Johnston /* 1344ad1633b3SMark Johnston * Aliases of weak symbols don't get a uniquifier. 1345ad1633b3SMark Johnston */ 1346ad1633b3SMark Johnston if (GELF_ST_BIND(fsym.st_info) == STB_WEAK) 1347ad1633b3SMark Johnston len = snprintf(NULL, 0, dt_weaksymfmt, 1348ad1633b3SMark Johnston dt_symprefix, s) + 1; 1349ad1633b3SMark Johnston else 13506ff6d951SJohn Birrell len = snprintf(NULL, 0, dt_symfmt, dt_symprefix, 13516ff6d951SJohn Birrell objkey, s) + 1; 13526ff6d951SJohn Birrell if ((p = dt_alloc(dtp, len)) == NULL) { 13536ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13546ff6d951SJohn Birrell goto err; 13556ff6d951SJohn Birrell } 13566ff6d951SJohn Birrell (void) snprintf(p, len, dt_symfmt, dt_symprefix, 13576ff6d951SJohn Birrell objkey, s); 13586ff6d951SJohn Birrell 13596ff6d951SJohn Birrell if (dt_strtab_index(strtab, p) == -1) { 1360d2d16e56SMark Johnston /* 1361d2d16e56SMark Johnston * Do not add new symbols if this object file 1362d2d16e56SMark Johnston * has already been processed. 1363d2d16e56SMark Johnston */ 1364d2d16e56SMark Johnston if (GELF_R_TYPE(rela.r_info) != DT_REL_NONE) 13656ff6d951SJohn Birrell nsym++; 13666ff6d951SJohn Birrell (void) dt_strtab_insert(strtab, p); 13676ff6d951SJohn Birrell } 13686ff6d951SJohn Birrell 13696ff6d951SJohn Birrell dt_free(dtp, p); 13706ff6d951SJohn Birrell } 13716ff6d951SJohn Birrell 13726ff6d951SJohn Birrell /* 1373d2d16e56SMark Johnston * If any new probes were found, allocate the additional space 1374d2d16e56SMark Johnston * for the symbol table and string table, copying the old data 1375d2d16e56SMark Johnston * into the new buffers, and marking the buffers as dirty. We 1376d2d16e56SMark Johnston * inject those newly allocated buffers into the libelf data 1377e801af6fSMark Johnston * structures, but are still responsible for freeing them once 1378e801af6fSMark Johnston * we're done with the elf handle. 13796ff6d951SJohn Birrell */ 1380d2d16e56SMark Johnston osym = isym; 13816ff6d951SJohn Birrell if (nsym > 0) { 13826ff6d951SJohn Birrell /* 13836ff6d951SJohn Birrell * The first byte of the string table is reserved for 13846ff6d951SJohn Birrell * the \0 entry. 13856ff6d951SJohn Birrell */ 13866ff6d951SJohn Birrell len = dt_strtab_size(strtab) - 1; 13876ff6d951SJohn Birrell 13886ff6d951SJohn Birrell assert(len > 0); 13896ff6d951SJohn Birrell assert(dt_strtab_index(strtab, "") == 0); 13906ff6d951SJohn Birrell 13916ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13926ff6d951SJohn Birrell 13936ff6d951SJohn Birrell if ((pair = dt_alloc(dtp, sizeof (*pair))) == NULL) 13946ff6d951SJohn Birrell goto err; 13956ff6d951SJohn Birrell 13966ff6d951SJohn Birrell if ((pair->dlp_str = dt_alloc(dtp, data_str->d_size + 13976ff6d951SJohn Birrell len)) == NULL) { 13986ff6d951SJohn Birrell dt_free(dtp, pair); 13996ff6d951SJohn Birrell goto err; 14006ff6d951SJohn Birrell } 14016ff6d951SJohn Birrell 14026ff6d951SJohn Birrell if ((pair->dlp_sym = dt_alloc(dtp, data_sym->d_size + 14036ff6d951SJohn Birrell nsym * symsize)) == NULL) { 14046ff6d951SJohn Birrell dt_free(dtp, pair->dlp_str); 14056ff6d951SJohn Birrell dt_free(dtp, pair); 14066ff6d951SJohn Birrell goto err; 14076ff6d951SJohn Birrell } 14086ff6d951SJohn Birrell 14096ff6d951SJohn Birrell pair->dlp_next = bufs; 14106ff6d951SJohn Birrell bufs = pair; 14116ff6d951SJohn Birrell 14126ff6d951SJohn Birrell bcopy(data_str->d_buf, pair->dlp_str, data_str->d_size); 1413273efb05SMark Johnston tmp = data_str->d_buf; 14146ff6d951SJohn Birrell data_str->d_buf = pair->dlp_str; 1415273efb05SMark Johnston pair->dlp_str = tmp; 14166ff6d951SJohn Birrell data_str->d_size += len; 14176ff6d951SJohn Birrell (void) elf_flagdata(data_str, ELF_C_SET, ELF_F_DIRTY); 14186ff6d951SJohn Birrell 14196ff6d951SJohn Birrell shdr_str.sh_size += len; 14206ff6d951SJohn Birrell (void) gelf_update_shdr(scn_str, &shdr_str); 14216ff6d951SJohn Birrell 14226ff6d951SJohn Birrell bcopy(data_sym->d_buf, pair->dlp_sym, data_sym->d_size); 1423273efb05SMark Johnston tmp = data_sym->d_buf; 14246ff6d951SJohn Birrell data_sym->d_buf = pair->dlp_sym; 1425273efb05SMark Johnston pair->dlp_sym = tmp; 14266ff6d951SJohn Birrell data_sym->d_size += nsym * symsize; 14276ff6d951SJohn Birrell (void) elf_flagdata(data_sym, ELF_C_SET, ELF_F_DIRTY); 14286ff6d951SJohn Birrell 14296ff6d951SJohn Birrell shdr_sym.sh_size += nsym * symsize; 14306ff6d951SJohn Birrell (void) gelf_update_shdr(scn_sym, &shdr_sym); 14316ff6d951SJohn Birrell 14326ff6d951SJohn Birrell nsym += isym; 1433d2d16e56SMark Johnston } else if (dt_strtab_empty(strtab)) { 14346ff6d951SJohn Birrell dt_strtab_destroy(strtab); 1435e801af6fSMark Johnston continue; 14366ff6d951SJohn Birrell } 14376ff6d951SJohn Birrell 14386ff6d951SJohn Birrell /* 14396ff6d951SJohn Birrell * Now that the tables have been allocated, perform the 14406ff6d951SJohn Birrell * modifications described above. 14416ff6d951SJohn Birrell */ 14426ff6d951SJohn Birrell for (i = 0; i < shdr_rel.sh_size / shdr_rel.sh_entsize; i++) { 14436ff6d951SJohn Birrell if (shdr_rel.sh_type == SHT_RELA) { 14446ff6d951SJohn Birrell if (gelf_getrela(data_rel, i, &rela) == NULL) 14456ff6d951SJohn Birrell continue; 14466ff6d951SJohn Birrell } else { 14476ff6d951SJohn Birrell GElf_Rel rel; 14486ff6d951SJohn Birrell if (gelf_getrel(data_rel, i, &rel) == NULL) 14496ff6d951SJohn Birrell continue; 14506ff6d951SJohn Birrell rela.r_offset = rel.r_offset; 14516ff6d951SJohn Birrell rela.r_info = rel.r_info; 14526ff6d951SJohn Birrell rela.r_addend = 0; 14536ff6d951SJohn Birrell } 14546ff6d951SJohn Birrell 14556ff6d951SJohn Birrell ndx = GELF_R_SYM(rela.r_info); 14566ff6d951SJohn Birrell 14576ff6d951SJohn Birrell if (gelf_getsym(data_sym, ndx, &rsym) == NULL || 14586ff6d951SJohn Birrell rsym.st_name > data_str->d_size) 14596ff6d951SJohn Birrell goto err; 14606ff6d951SJohn Birrell 14616ff6d951SJohn Birrell s = (char *)data_str->d_buf + rsym.st_name; 14626ff6d951SJohn Birrell 14636ff6d951SJohn Birrell if (strncmp(s, dt_prefix, sizeof (dt_prefix) - 1) != 0) 14646ff6d951SJohn Birrell continue; 14656ff6d951SJohn Birrell 14666ff6d951SJohn Birrell s += sizeof (dt_prefix) - 1; 14676ff6d951SJohn Birrell 14686ff6d951SJohn Birrell /* 14696ff6d951SJohn Birrell * Check to see if this is an 'is-enabled' check as 14706ff6d951SJohn Birrell * opposed to a normal probe. 14716ff6d951SJohn Birrell */ 14726ff6d951SJohn Birrell if (strncmp(s, dt_enabled, 14736ff6d951SJohn Birrell sizeof (dt_enabled) - 1) == 0) { 14746ff6d951SJohn Birrell s += sizeof (dt_enabled) - 1; 14756ff6d951SJohn Birrell eprobe = 1; 14766ff6d951SJohn Birrell *eprobesp = 1; 14776ff6d951SJohn Birrell dt_dprintf("is-enabled probe\n"); 14786ff6d951SJohn Birrell } else { 14796ff6d951SJohn Birrell eprobe = 0; 14806ff6d951SJohn Birrell dt_dprintf("normal probe\n"); 14816ff6d951SJohn Birrell } 14826ff6d951SJohn Birrell 14836ff6d951SJohn Birrell if (*s++ != '_') 14846ff6d951SJohn Birrell goto err; 14856ff6d951SJohn Birrell 14866ff6d951SJohn Birrell if ((p = strstr(s, "___")) == NULL || 14876ff6d951SJohn Birrell p - s >= sizeof (pname)) 14886ff6d951SJohn Birrell goto err; 14896ff6d951SJohn Birrell 14906ff6d951SJohn Birrell bcopy(s, pname, p - s); 14916ff6d951SJohn Birrell pname[p - s] = '\0'; 14926ff6d951SJohn Birrell 1493e801af6fSMark Johnston if (dt_symtab_lookup(data_sym, osym, isym, 1494e801af6fSMark Johnston rela.r_offset, shdr_rel.sh_info, &fsym, 14957283901aSBrandon Bergren uses_funcdesc, elf) == 0) { 14966ff6d951SJohn Birrell if (fsym.st_name > data_str->d_size) 14976ff6d951SJohn Birrell goto err; 14986ff6d951SJohn Birrell 1499281e4f2dSMark Johnston r = s = (char *) data_str->d_buf + fsym.st_name; 1500281e4f2dSMark Johnston assert(strstr(s, dt_symprefix) == s); 1501281e4f2dSMark Johnston s = strchr(s, '.') + 1; 1502281e4f2dSMark Johnston } else if (dt_symtab_lookup(data_sym, 0, osym, 1503281e4f2dSMark Johnston rela.r_offset, shdr_rel.sh_info, &fsym, 15047283901aSBrandon Bergren uses_funcdesc, elf) == 0) { 1505281e4f2dSMark Johnston u_int bind; 1506281e4f2dSMark Johnston 1507281e4f2dSMark Johnston bind = GELF_ST_BIND(fsym.st_info) == STB_WEAK ? 1508281e4f2dSMark Johnston STB_WEAK : STB_GLOBAL; 1509d2d16e56SMark Johnston s = (char *) data_str->d_buf + fsym.st_name; 1510d2d16e56SMark Johnston if (GELF_R_TYPE(rela.r_info) != DT_REL_NONE) { 15116ff6d951SJohn Birrell /* 1512d2d16e56SMark Johnston * Emit an alias for the symbol. It 1513d2d16e56SMark Johnston * needs to be non-preemptible so that 1514d2d16e56SMark Johnston * .SUNW_dof relocations may be resolved 1515d2d16e56SMark Johnston * at static link time. Aliases of weak 1516d2d16e56SMark Johnston * symbols are given a non-unique name 1517d2d16e56SMark Johnston * so that they may be merged by the 1518d2d16e56SMark Johnston * linker. 15196ff6d951SJohn Birrell */ 15206ff6d951SJohn Birrell dsym = fsym; 15216ff6d951SJohn Birrell dsym.st_name = istr; 1522d2d16e56SMark Johnston dsym.st_info = GELF_ST_INFO(bind, 1523d2d16e56SMark Johnston STT_FUNC); 1524d2d16e56SMark Johnston dsym.st_other = 1525d2d16e56SMark Johnston GELF_ST_VISIBILITY(STV_HIDDEN); 1526d2d16e56SMark Johnston (void) gelf_update_sym(data_sym, isym, 1527d2d16e56SMark Johnston &dsym); 15286ff6d951SJohn Birrell isym++; 15296ff6d951SJohn Birrell assert(isym <= nsym); 1530d2d16e56SMark Johnston 1531d2d16e56SMark Johnston r = (char *) data_str->d_buf + istr; 1532d2d16e56SMark Johnston if (bind == STB_WEAK) { 1533d2d16e56SMark Johnston istr += sprintf(r, 1534d2d16e56SMark Johnston dt_weaksymfmt, dt_symprefix, 1535d2d16e56SMark Johnston s); 1536d2d16e56SMark Johnston } else { 1537d2d16e56SMark Johnston istr += sprintf(r, dt_symfmt, 1538d2d16e56SMark Johnston dt_symprefix, objkey, s); 1539d2d16e56SMark Johnston } 1540d2d16e56SMark Johnston istr++; 1541d2d16e56SMark Johnston } else { 1542d2d16e56SMark Johnston if (bind == STB_WEAK) { 1543d2d16e56SMark Johnston (void) asprintf(&r, 1544d2d16e56SMark Johnston dt_weaksymfmt, dt_symprefix, 1545d2d16e56SMark Johnston s); 1546d2d16e56SMark Johnston } else { 1547d2d16e56SMark Johnston (void) asprintf(&r, dt_symfmt, 1548d2d16e56SMark Johnston dt_symprefix, objkey, s); 1549d2d16e56SMark Johnston } 1550d2d16e56SMark Johnston } 1551d2d16e56SMark Johnston } else { 1552281e4f2dSMark Johnston goto err; 1553d2d16e56SMark Johnston } 15546ff6d951SJohn Birrell 15556ff6d951SJohn Birrell if ((pvp = dt_provider_lookup(dtp, pname)) == NULL) { 15566ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 15576ff6d951SJohn Birrell "no such provider %s", pname)); 15586ff6d951SJohn Birrell } 15596ff6d951SJohn Birrell 15603a3e3279SMark Johnston if (strlcpy(probename, p + 3, sizeof (probename)) >= 15613a3e3279SMark Johnston sizeof (probename)) 15626ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 15633a3e3279SMark Johnston "invalid probe name %s", probename)); 15643a3e3279SMark Johnston (void) strhyphenate(probename); 15653a3e3279SMark Johnston if ((prp = dt_probe_lookup(pvp, probename)) == NULL) 15663a3e3279SMark Johnston return (dt_link_error(dtp, elf, fd, bufs, 15673a3e3279SMark Johnston "no such probe %s", probename)); 15686ff6d951SJohn Birrell 15696ff6d951SJohn Birrell assert(fsym.st_value <= rela.r_offset); 15706ff6d951SJohn Birrell 15716ff6d951SJohn Birrell off = rela.r_offset - fsym.st_value; 15726ff6d951SJohn Birrell if (dt_modtext(dtp, data_tgt->d_buf, eprobe, 15730f2bd1e8SRui Paulo &rela, &off) != 0) 15746ff6d951SJohn Birrell goto err; 15756ff6d951SJohn Birrell 15766ff6d951SJohn Birrell if (dt_probe_define(pvp, prp, s, r, off, eprobe) != 0) { 15776ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 15786ff6d951SJohn Birrell "failed to allocate space for probe")); 15796ff6d951SJohn Birrell } 15800e15d9fbSMark Johnston 15810f2bd1e8SRui Paulo /* 1582d2d16e56SMark Johnston * We are done with this relocation, but it must be 1583d2d16e56SMark Johnston * preserved in order to support incremental rebuilds. 15840f2bd1e8SRui Paulo */ 15852b374230SMark Johnston if (shdr_rel.sh_type == SHT_RELA) { 1586c612709bSMark Johnston rela.r_info = GELF_R_INFO( 1587c612709bSMark Johnston GELF_R_SYM(rela.r_info), DT_REL_NONE); 15880f2bd1e8SRui Paulo (void) gelf_update_rela(data_rel, i, &rela); 15892b374230SMark Johnston } else { 15902b374230SMark Johnston GElf_Rel rel; 1591d2d16e56SMark Johnston rel.r_offset = rela.r_offset; 1592c612709bSMark Johnston rel.r_info = GELF_R_INFO( 1593c612709bSMark Johnston GELF_R_SYM(rela.r_info), DT_REL_NONE); 15942b374230SMark Johnston (void) gelf_update_rel(data_rel, i, &rel); 15952b374230SMark Johnston } 15966ff6d951SJohn Birrell 15976ff6d951SJohn Birrell mod = 1; 15986ff6d951SJohn Birrell (void) elf_flagdata(data_tgt, ELF_C_SET, ELF_F_DIRTY); 15996ff6d951SJohn Birrell 16006ff6d951SJohn Birrell /* 16016ff6d951SJohn Birrell * This symbol may already have been marked to 16026ff6d951SJohn Birrell * be ignored by another relocation referencing 16036ff6d951SJohn Birrell * the same symbol or if this object file has 16046ff6d951SJohn Birrell * already been processed by an earlier link 16056ff6d951SJohn Birrell * invocation. 16066ff6d951SJohn Birrell */ 16070e15d9fbSMark Johnston if (rsym.st_shndx != SHN_ABS) { 16080e15d9fbSMark Johnston rsym.st_shndx = SHN_ABS; 16096ff6d951SJohn Birrell (void) gelf_update_sym(data_sym, ndx, &rsym); 16106ff6d951SJohn Birrell } 16116ff6d951SJohn Birrell } 16126ff6d951SJohn Birrell } 16136ff6d951SJohn Birrell 16146ff6d951SJohn Birrell if (mod && elf_update(elf, ELF_C_WRITE) == -1) 16156ff6d951SJohn Birrell goto err; 16166ff6d951SJohn Birrell 16176ff6d951SJohn Birrell (void) elf_end(elf); 16186ff6d951SJohn Birrell (void) close(fd); 16196ff6d951SJohn Birrell 16206ff6d951SJohn Birrell while ((pair = bufs) != NULL) { 16216ff6d951SJohn Birrell bufs = pair->dlp_next; 16226ff6d951SJohn Birrell dt_free(dtp, pair->dlp_str); 16236ff6d951SJohn Birrell dt_free(dtp, pair->dlp_sym); 16246ff6d951SJohn Birrell dt_free(dtp, pair); 16256ff6d951SJohn Birrell } 16266ff6d951SJohn Birrell 16276ff6d951SJohn Birrell return (0); 16286ff6d951SJohn Birrell 16296ff6d951SJohn Birrell err: 16306ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 16316ff6d951SJohn Birrell "an error was encountered while processing %s", obj)); 16326ff6d951SJohn Birrell } 16336ff6d951SJohn Birrell 16346ff6d951SJohn Birrell int 16356ff6d951SJohn Birrell dtrace_program_link(dtrace_hdl_t *dtp, dtrace_prog_t *pgp, uint_t dflags, 16366ff6d951SJohn Birrell const char *file, int objc, char *const objv[]) 16376ff6d951SJohn Birrell { 16382693feb4SJohn Birrell char tfile[PATH_MAX]; 16396ff6d951SJohn Birrell char drti[PATH_MAX]; 16406ff6d951SJohn Birrell dof_hdr_t *dof; 16416ff6d951SJohn Birrell int fd, status, i, cur; 16426ff6d951SJohn Birrell char *cmd, tmp; 16436ff6d951SJohn Birrell size_t len; 16446ff6d951SJohn Birrell int eprobes = 0, ret = 0; 16456ff6d951SJohn Birrell 16466ff6d951SJohn Birrell /* 16476ff6d951SJohn Birrell * A NULL program indicates a special use in which we just link 16486ff6d951SJohn Birrell * together a bunch of object files specified in objv and then 16496ff6d951SJohn Birrell * unlink(2) those object files. 16506ff6d951SJohn Birrell */ 16516ff6d951SJohn Birrell if (pgp == NULL) { 16526ff6d951SJohn Birrell const char *fmt = "%s -o %s -r"; 16536ff6d951SJohn Birrell 16546ff6d951SJohn Birrell len = snprintf(&tmp, 1, fmt, dtp->dt_ld_path, file) + 1; 16556ff6d951SJohn Birrell 16566ff6d951SJohn Birrell for (i = 0; i < objc; i++) 16576ff6d951SJohn Birrell len += strlen(objv[i]) + 1; 16586ff6d951SJohn Birrell 16596ff6d951SJohn Birrell cmd = alloca(len); 16606ff6d951SJohn Birrell 16616ff6d951SJohn Birrell cur = snprintf(cmd, len, fmt, dtp->dt_ld_path, file); 16626ff6d951SJohn Birrell 16636ff6d951SJohn Birrell for (i = 0; i < objc; i++) 16646ff6d951SJohn Birrell cur += snprintf(cmd + cur, len - cur, " %s", objv[i]); 16656ff6d951SJohn Birrell 16666ff6d951SJohn Birrell if ((status = system(cmd)) == -1) { 16676ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 16686ff6d951SJohn Birrell "failed to run %s: %s", dtp->dt_ld_path, 16696ff6d951SJohn Birrell strerror(errno))); 16706ff6d951SJohn Birrell } 16716ff6d951SJohn Birrell 16726ff6d951SJohn Birrell if (WIFSIGNALED(status)) { 16736ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 16746ff6d951SJohn Birrell "failed to link %s: %s failed due to signal %d", 16756ff6d951SJohn Birrell file, dtp->dt_ld_path, WTERMSIG(status))); 16766ff6d951SJohn Birrell } 16776ff6d951SJohn Birrell 16786ff6d951SJohn Birrell if (WEXITSTATUS(status) != 0) { 16796ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 16806ff6d951SJohn Birrell "failed to link %s: %s exited with status %d\n", 16816ff6d951SJohn Birrell file, dtp->dt_ld_path, WEXITSTATUS(status))); 16826ff6d951SJohn Birrell } 16836ff6d951SJohn Birrell 16846ff6d951SJohn Birrell for (i = 0; i < objc; i++) { 16856ff6d951SJohn Birrell if (strcmp(objv[i], file) != 0) 16866ff6d951SJohn Birrell (void) unlink(objv[i]); 16876ff6d951SJohn Birrell } 16886ff6d951SJohn Birrell 16896ff6d951SJohn Birrell return (0); 16906ff6d951SJohn Birrell } 16916ff6d951SJohn Birrell 16926ff6d951SJohn Birrell for (i = 0; i < objc; i++) { 16936ff6d951SJohn Birrell if (process_obj(dtp, objv[i], &eprobes) != 0) 16946ff6d951SJohn Birrell return (-1); /* errno is set for us */ 16956ff6d951SJohn Birrell } 16966ff6d951SJohn Birrell 16976ff6d951SJohn Birrell /* 16986ff6d951SJohn Birrell * If there are is-enabled probes then we need to force use of DOF 16996ff6d951SJohn Birrell * version 2. 17006ff6d951SJohn Birrell */ 17016ff6d951SJohn Birrell if (eprobes && pgp->dp_dofversion < DOF_VERSION_2) 17026ff6d951SJohn Birrell pgp->dp_dofversion = DOF_VERSION_2; 17036ff6d951SJohn Birrell 17046ff6d951SJohn Birrell if ((dof = dtrace_dof_create(dtp, pgp, dflags)) == NULL) 17056ff6d951SJohn Birrell return (-1); /* errno is set for us */ 17066ff6d951SJohn Birrell 170733d84250SMark Johnston snprintf(tfile, sizeof(tfile), "%s.XXXXXX", file); 1708ed09cc1bSMark Johnston if ((fd = mkostemp(tfile, O_CLOEXEC)) == -1) 17092693feb4SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 171033d84250SMark Johnston "failed to create temporary file %s: %s", 171133d84250SMark Johnston tfile, strerror(errno))); 17126ff6d951SJohn Birrell 17136ff6d951SJohn Birrell /* 17146ff6d951SJohn Birrell * If -xlinktype=DOF has been selected, just write out the DOF. 17156ff6d951SJohn Birrell * Otherwise proceed to the default of generating and linking ELF. 17166ff6d951SJohn Birrell */ 17176ff6d951SJohn Birrell switch (dtp->dt_linktype) { 17186ff6d951SJohn Birrell case DT_LTYP_DOF: 17196ff6d951SJohn Birrell if (dt_write(dtp, fd, dof, dof->dofh_filesz) < dof->dofh_filesz) 17206ff6d951SJohn Birrell ret = errno; 17216ff6d951SJohn Birrell 17226ff6d951SJohn Birrell if (close(fd) != 0 && ret == 0) 17236ff6d951SJohn Birrell ret = errno; 17246ff6d951SJohn Birrell 17256ff6d951SJohn Birrell if (ret != 0) { 17266ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 17276ff6d951SJohn Birrell "failed to write %s: %s", file, strerror(ret))); 17286ff6d951SJohn Birrell } 17296ff6d951SJohn Birrell 17306ff6d951SJohn Birrell return (0); 17316ff6d951SJohn Birrell 17326ff6d951SJohn Birrell case DT_LTYP_ELF: 17336ff6d951SJohn Birrell break; /* fall through to the rest of dtrace_program_link() */ 17346ff6d951SJohn Birrell 17356ff6d951SJohn Birrell default: 17366ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 17376ff6d951SJohn Birrell "invalid link type %u\n", dtp->dt_linktype)); 17386ff6d951SJohn Birrell } 17396ff6d951SJohn Birrell 17406ff6d951SJohn Birrell 17416ff6d951SJohn Birrell if (dtp->dt_oflags & DTRACE_O_LP64) 17426ff6d951SJohn Birrell status = dump_elf64(dtp, dof, fd); 17436ff6d951SJohn Birrell else 17446ff6d951SJohn Birrell status = dump_elf32(dtp, dof, fd); 17456ff6d951SJohn Birrell 17468caf8a8dSMark Johnston if (status != 0) 174733d84250SMark Johnston return (dt_link_error(dtp, NULL, -1, NULL, 17488caf8a8dSMark Johnston "failed to write %s: %s", tfile, 17498caf8a8dSMark Johnston strerror(dtrace_errno(dtp)))); 17506ff6d951SJohn Birrell 17516ff6d951SJohn Birrell if (!dtp->dt_lazyload) { 17528caf8a8dSMark Johnston const char *fmt = "%s -o %s -r %s %s"; 17530fff3baaSMark Johnston dt_dirpath_t *dp = dt_list_next(&dtp->dt_lib_path); 17542693feb4SJohn Birrell 17550fff3baaSMark Johnston (void) snprintf(drti, sizeof (drti), "%s/drti.o", dp->dir_path); 17562693feb4SJohn Birrell 17572693feb4SJohn Birrell len = snprintf(&tmp, 1, fmt, dtp->dt_ld_path, file, tfile, 17582693feb4SJohn Birrell drti) + 1; 17592693feb4SJohn Birrell 17602693feb4SJohn Birrell cmd = alloca(len); 17612693feb4SJohn Birrell 17628caf8a8dSMark Johnston (void) snprintf(cmd, len, fmt, dtp->dt_ld_path, file, tfile, 17630f2bd1e8SRui Paulo drti); 17646ff6d951SJohn Birrell if ((status = system(cmd)) == -1) { 176503a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 17666ff6d951SJohn Birrell "failed to run %s: %s", dtp->dt_ld_path, 17676ff6d951SJohn Birrell strerror(errno)); 17686ff6d951SJohn Birrell goto done; 17696ff6d951SJohn Birrell } 17706ff6d951SJohn Birrell 17716ff6d951SJohn Birrell if (WIFSIGNALED(status)) { 177203a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 17736ff6d951SJohn Birrell "failed to link %s: %s failed due to signal %d", 17746ff6d951SJohn Birrell file, dtp->dt_ld_path, WTERMSIG(status)); 17756ff6d951SJohn Birrell goto done; 17766ff6d951SJohn Birrell } 17776ff6d951SJohn Birrell 17786ff6d951SJohn Birrell if (WEXITSTATUS(status) != 0) { 177903a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 17806ff6d951SJohn Birrell "failed to link %s: %s exited with status %d\n", 17816ff6d951SJohn Birrell file, dtp->dt_ld_path, WEXITSTATUS(status)); 17826ff6d951SJohn Birrell goto done; 17836ff6d951SJohn Birrell } 17840f2bd1e8SRui Paulo (void) close(fd); /* release temporary file */ 178503a5f9f0SMark Johnston 178603a5f9f0SMark Johnston /* 178703a5f9f0SMark Johnston * Now that we've linked drti.o, reduce the global __SUNW_dof 178803a5f9f0SMark Johnston * symbol to a local symbol. This is needed to so that multiple 178903a5f9f0SMark Johnston * generated object files (for different providers, for 179003a5f9f0SMark Johnston * instance) can be linked together. This is accomplished using 179103a5f9f0SMark Johnston * the -Blocal flag with Sun's linker, but GNU ld doesn't appear 179203a5f9f0SMark Johnston * to have an equivalent option. 179303a5f9f0SMark Johnston */ 179403a5f9f0SMark Johnston asprintf(&cmd, "%s --localize-hidden %s", dtp->dt_objcopy_path, 179503a5f9f0SMark Johnston file); 179603a5f9f0SMark Johnston if ((status = system(cmd)) == -1) { 179703a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, -1, NULL, 179803a5f9f0SMark Johnston "failed to run %s: %s", dtp->dt_objcopy_path, 179903a5f9f0SMark Johnston strerror(errno)); 180003a5f9f0SMark Johnston free(cmd); 180103a5f9f0SMark Johnston goto done; 180203a5f9f0SMark Johnston } 180303a5f9f0SMark Johnston free(cmd); 180403a5f9f0SMark Johnston 180503a5f9f0SMark Johnston if (WIFSIGNALED(status)) { 180603a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, -1, NULL, 180703a5f9f0SMark Johnston "failed to link %s: %s failed due to signal %d", 180803a5f9f0SMark Johnston file, dtp->dt_objcopy_path, WTERMSIG(status)); 180903a5f9f0SMark Johnston goto done; 181003a5f9f0SMark Johnston } 181103a5f9f0SMark Johnston 181203a5f9f0SMark Johnston if (WEXITSTATUS(status) != 0) { 181303a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, -1, NULL, 181403a5f9f0SMark Johnston "failed to link %s: %s exited with status %d\n", 181503a5f9f0SMark Johnston file, dtp->dt_objcopy_path, WEXITSTATUS(status)); 181603a5f9f0SMark Johnston goto done; 181703a5f9f0SMark Johnston } 18186ff6d951SJohn Birrell } else { 1819ed09cc1bSMark Johnston if (rename(tfile, file) != 0) { 1820ed09cc1bSMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 1821ed09cc1bSMark Johnston "failed to rename %s to %s: %s", tfile, file, 1822ed09cc1bSMark Johnston strerror(errno)); 1823ed09cc1bSMark Johnston goto done; 1824ed09cc1bSMark Johnston } 18256ff6d951SJohn Birrell (void) close(fd); 18266ff6d951SJohn Birrell } 18276ff6d951SJohn Birrell 18286ff6d951SJohn Birrell done: 18296ff6d951SJohn Birrell dtrace_dof_destroy(dtp, dof); 18302693feb4SJohn Birrell 1831ed09cc1bSMark Johnston if (!dtp->dt_lazyload) 1832ed09cc1bSMark Johnston (void) unlink(tfile); 18336ff6d951SJohn Birrell return (ret); 18346ff6d951SJohn Birrell } 1835