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> 349e5787d2SMatt Macy #include <sys/types.h> 350e15d9fbSMark Johnston #include <fcntl.h> 360e15d9fbSMark Johnston #include <gelf.h> 376ff6d951SJohn Birrell #include <limits.h> 386ff6d951SJohn Birrell #include <stddef.h> 396ff6d951SJohn Birrell #include <stdio.h> 400e15d9fbSMark Johnston #include <stdlib.h> 410e15d9fbSMark Johnston #include <strings.h> 426ff6d951SJohn Birrell #include <errno.h> 430e15d9fbSMark Johnston #include <unistd.h> 440e15d9fbSMark Johnston 450f2bd1e8SRui Paulo #include <libelf.h> 466ff6d951SJohn Birrell 476ff6d951SJohn Birrell #include <dt_impl.h> 486ff6d951SJohn Birrell #include <dt_provider.h> 496ff6d951SJohn Birrell #include <dt_program.h> 506ff6d951SJohn Birrell #include <dt_string.h> 516ff6d951SJohn Birrell 526ff6d951SJohn Birrell #define ESHDR_NULL 0 536ff6d951SJohn Birrell #define ESHDR_SHSTRTAB 1 546ff6d951SJohn Birrell #define ESHDR_DOF 2 556ff6d951SJohn Birrell #define ESHDR_STRTAB 3 566ff6d951SJohn Birrell #define ESHDR_SYMTAB 4 576ff6d951SJohn Birrell #define ESHDR_REL 5 586ff6d951SJohn Birrell #define ESHDR_NUM 6 596ff6d951SJohn Birrell 606ff6d951SJohn Birrell #define PWRITE_SCN(index, data) \ 616ff6d951SJohn Birrell (lseek64(fd, (off64_t)elf_file.shdr[(index)].sh_offset, SEEK_SET) != \ 626ff6d951SJohn Birrell (off64_t)elf_file.shdr[(index)].sh_offset || \ 636ff6d951SJohn Birrell dt_write(dtp, fd, (data), elf_file.shdr[(index)].sh_size) != \ 646ff6d951SJohn Birrell elf_file.shdr[(index)].sh_size) 656ff6d951SJohn Birrell 666ff6d951SJohn Birrell static const char DTRACE_SHSTRTAB32[] = "\0" 676ff6d951SJohn Birrell ".shstrtab\0" /* 1 */ 686ff6d951SJohn Birrell ".SUNW_dof\0" /* 11 */ 696ff6d951SJohn Birrell ".strtab\0" /* 21 */ 706ff6d951SJohn Birrell ".symtab\0" /* 29 */ 716ff6d951SJohn Birrell ".rel.SUNW_dof"; /* 37 */ 726ff6d951SJohn Birrell 736ff6d951SJohn Birrell static const char DTRACE_SHSTRTAB64[] = "\0" 746ff6d951SJohn Birrell ".shstrtab\0" /* 1 */ 756ff6d951SJohn Birrell ".SUNW_dof\0" /* 11 */ 766ff6d951SJohn Birrell ".strtab\0" /* 21 */ 776ff6d951SJohn Birrell ".symtab\0" /* 29 */ 786ff6d951SJohn Birrell ".rela.SUNW_dof"; /* 37 */ 796ff6d951SJohn Birrell 806ff6d951SJohn Birrell static const char DOFSTR[] = "__SUNW_dof"; 816ff6d951SJohn Birrell static const char DOFLAZYSTR[] = "___SUNW_dof"; 826ff6d951SJohn Birrell 836ff6d951SJohn Birrell typedef struct dt_link_pair { 846ff6d951SJohn Birrell struct dt_link_pair *dlp_next; /* next pair in linked list */ 856ff6d951SJohn Birrell void *dlp_str; /* buffer for string table */ 866ff6d951SJohn Birrell void *dlp_sym; /* buffer for symbol table */ 876ff6d951SJohn Birrell } dt_link_pair_t; 886ff6d951SJohn Birrell 896ff6d951SJohn Birrell typedef struct dof_elf32 { 906ff6d951SJohn Birrell uint32_t de_nrel; /* relocation count */ 916ff6d951SJohn Birrell Elf32_Rel *de_rel; /* array of relocations for x86 */ 926ff6d951SJohn Birrell uint32_t de_nsym; /* symbol count */ 936ff6d951SJohn Birrell Elf32_Sym *de_sym; /* array of symbols */ 946ff6d951SJohn Birrell uint32_t de_strlen; /* size of of string table */ 956ff6d951SJohn Birrell char *de_strtab; /* string table */ 966ff6d951SJohn Birrell uint32_t de_global; /* index of the first global symbol */ 976ff6d951SJohn Birrell } dof_elf32_t; 986ff6d951SJohn Birrell 996ff6d951SJohn Birrell static int 1006ff6d951SJohn Birrell prepare_elf32(dtrace_hdl_t *dtp, const dof_hdr_t *dof, dof_elf32_t *dep) 1016ff6d951SJohn Birrell { 1026ff6d951SJohn Birrell dof_sec_t *dofs, *s; 1036ff6d951SJohn Birrell dof_relohdr_t *dofrh; 1046ff6d951SJohn Birrell dof_relodesc_t *dofr; 1056ff6d951SJohn Birrell char *strtab; 1066ff6d951SJohn Birrell int i, j, nrel; 1076ff6d951SJohn Birrell size_t strtabsz = 1; 1086ff6d951SJohn Birrell uint32_t count = 0; 1096ff6d951SJohn Birrell size_t base; 1106ff6d951SJohn Birrell Elf32_Sym *sym; 1116ff6d951SJohn Birrell Elf32_Rel *rel; 1126ff6d951SJohn Birrell 1136ff6d951SJohn Birrell /*LINTED*/ 1146ff6d951SJohn Birrell dofs = (dof_sec_t *)((char *)dof + dof->dofh_secoff); 1156ff6d951SJohn Birrell 1166ff6d951SJohn Birrell /* 1176ff6d951SJohn Birrell * First compute the size of the string table and the number of 1186ff6d951SJohn Birrell * relocations present in the DOF. 1196ff6d951SJohn Birrell */ 1206ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 1216ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 1226ff6d951SJohn Birrell continue; 1236ff6d951SJohn Birrell 1246ff6d951SJohn Birrell /*LINTED*/ 1256ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 1266ff6d951SJohn Birrell 1276ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 1286ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 1296ff6d951SJohn Birrell assert(strtab[0] == '\0'); 1306ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 1316ff6d951SJohn Birrell 1326ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 1336ff6d951SJohn Birrell /*LINTED*/ 1346ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 1356ff6d951SJohn Birrell count += s->dofs_size / s->dofs_entsize; 1366ff6d951SJohn Birrell } 1376ff6d951SJohn Birrell 1386ff6d951SJohn Birrell dep->de_strlen = strtabsz; 1396ff6d951SJohn Birrell dep->de_nrel = count; 1406ff6d951SJohn Birrell dep->de_nsym = count + 1; /* the first symbol is always null */ 1416ff6d951SJohn Birrell 1426ff6d951SJohn Birrell if (dtp->dt_lazyload) { 1436ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFLAZYSTR); 1446ff6d951SJohn Birrell dep->de_nsym++; 1456ff6d951SJohn Birrell } else { 1466ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFSTR); 1476ff6d951SJohn Birrell dep->de_nsym++; 1486ff6d951SJohn Birrell } 1496ff6d951SJohn Birrell 1506ff6d951SJohn Birrell if ((dep->de_rel = calloc(dep->de_nrel, 1516ff6d951SJohn Birrell sizeof (dep->de_rel[0]))) == NULL) { 1526ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 1536ff6d951SJohn Birrell } 1546ff6d951SJohn Birrell 1556ff6d951SJohn Birrell if ((dep->de_sym = calloc(dep->de_nsym, sizeof (Elf32_Sym))) == NULL) { 1566ff6d951SJohn Birrell free(dep->de_rel); 1576ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 1586ff6d951SJohn Birrell } 1596ff6d951SJohn Birrell 1606ff6d951SJohn Birrell if ((dep->de_strtab = calloc(dep->de_strlen, 1)) == NULL) { 1616ff6d951SJohn Birrell free(dep->de_rel); 1626ff6d951SJohn Birrell free(dep->de_sym); 1636ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 1646ff6d951SJohn Birrell } 1656ff6d951SJohn Birrell 1666ff6d951SJohn Birrell count = 0; 1676ff6d951SJohn Birrell strtabsz = 1; 1686ff6d951SJohn Birrell dep->de_strtab[0] = '\0'; 1696ff6d951SJohn Birrell rel = dep->de_rel; 1706ff6d951SJohn Birrell sym = dep->de_sym; 1716ff6d951SJohn Birrell dep->de_global = 1; 1726ff6d951SJohn Birrell 1736ff6d951SJohn Birrell /* 1746ff6d951SJohn Birrell * The first symbol table entry must be zeroed and is always ignored. 1756ff6d951SJohn Birrell */ 1766ff6d951SJohn Birrell bzero(sym, sizeof (Elf32_Sym)); 1776ff6d951SJohn Birrell sym++; 1786ff6d951SJohn Birrell 1796ff6d951SJohn Birrell /* 1806ff6d951SJohn Birrell * Take a second pass through the DOF sections filling in the 1816ff6d951SJohn Birrell * memory we allocated. 1826ff6d951SJohn Birrell */ 1836ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 1846ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 1856ff6d951SJohn Birrell continue; 1866ff6d951SJohn Birrell 1876ff6d951SJohn Birrell /*LINTED*/ 1886ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 1896ff6d951SJohn Birrell 1906ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 1916ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 1926ff6d951SJohn Birrell bcopy(strtab + 1, dep->de_strtab + strtabsz, s->dofs_size); 1936ff6d951SJohn Birrell base = strtabsz; 1946ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 1956ff6d951SJohn Birrell 1966ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 1976ff6d951SJohn Birrell /*LINTED*/ 1986ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 1996ff6d951SJohn Birrell nrel = s->dofs_size / s->dofs_entsize; 2006ff6d951SJohn Birrell 2016ff6d951SJohn Birrell s = &dofs[dofrh->dofr_tgtsec]; 2026ff6d951SJohn Birrell 2036ff6d951SJohn Birrell for (j = 0; j < nrel; j++) { 204b78ee15eSRuslan Bukin #if defined(__aarch64__) 205a2ea7849SMark Johnston rel->r_offset = s->dofs_offset + 206a2ea7849SMark Johnston dofr[j].dofr_offset; 207a2ea7849SMark Johnston rel->r_info = ELF32_R_INFO(count + dep->de_global, 208a2ea7849SMark Johnston R_ARM_REL32); 209b78ee15eSRuslan Bukin #elif defined(__arm__) 2102693feb4SJohn Birrell /* XXX */ 211732f2c69SEd Maste printf("%s:%s(%d): arm not implemented\n", 212732f2c69SEd Maste __FUNCTION__, __FILE__, __LINE__); 2132693feb4SJohn Birrell #elif defined(__i386) || defined(__amd64) 2146ff6d951SJohn Birrell rel->r_offset = s->dofs_offset + 2156ff6d951SJohn Birrell dofr[j].dofr_offset; 2166ff6d951SJohn Birrell rel->r_info = ELF32_R_INFO(count + dep->de_global, 217e801af6fSMark Johnston R_386_PC32); 2182693feb4SJohn Birrell #elif defined(__mips__) 2192693feb4SJohn Birrell /* XXX */ 220732f2c69SEd Maste printf("%s:%s(%d): MIPS not implemented\n", 221732f2c69SEd Maste __FUNCTION__, __FILE__, __LINE__); 2222693feb4SJohn Birrell #elif defined(__powerpc__) 22330b318b9SJustin Hibbits /* 22430b318b9SJustin Hibbits * Add 4 bytes to hit the low half of this 64-bit 22530b318b9SJustin Hibbits * big-endian address. 22630b318b9SJustin Hibbits */ 22730b318b9SJustin Hibbits rel->r_offset = s->dofs_offset + 22830b318b9SJustin Hibbits dofr[j].dofr_offset + 4; 22930b318b9SJustin Hibbits rel->r_info = ELF32_R_INFO(count + dep->de_global, 23030b318b9SJustin Hibbits R_PPC_REL32); 231ca20f8ecSRuslan Bukin #elif defined(__riscv) 232fed1ca4bSRuslan Bukin /* XXX */ 233732f2c69SEd Maste printf("%s:%s(%d): RISC-V not implemented\n", 234732f2c69SEd Maste __FUNCTION__, __FILE__, __LINE__); 2356ff6d951SJohn Birrell #else 2366ff6d951SJohn Birrell #error unknown ISA 2376ff6d951SJohn Birrell #endif 2386ff6d951SJohn Birrell 2396ff6d951SJohn Birrell sym->st_name = base + dofr[j].dofr_name - 1; 2406ff6d951SJohn Birrell sym->st_value = 0; 2416ff6d951SJohn Birrell sym->st_size = 0; 2426ff6d951SJohn Birrell sym->st_info = ELF32_ST_INFO(STB_GLOBAL, STT_FUNC); 243df7165b8SMark Johnston sym->st_other = ELF32_ST_VISIBILITY(STV_HIDDEN); 2446ff6d951SJohn Birrell sym->st_shndx = SHN_UNDEF; 2456ff6d951SJohn Birrell 2466ff6d951SJohn Birrell rel++; 2476ff6d951SJohn Birrell sym++; 2486ff6d951SJohn Birrell count++; 2496ff6d951SJohn Birrell } 2506ff6d951SJohn Birrell } 2516ff6d951SJohn Birrell 2526ff6d951SJohn Birrell /* 2536ff6d951SJohn Birrell * Add a symbol for the DOF itself. We use a different symbol for 2546ff6d951SJohn Birrell * lazily and actively loaded DOF to make them easy to distinguish. 2556ff6d951SJohn Birrell */ 2566ff6d951SJohn Birrell sym->st_name = strtabsz; 2576ff6d951SJohn Birrell sym->st_value = 0; 2586ff6d951SJohn Birrell sym->st_size = dof->dofh_filesz; 2596ff6d951SJohn Birrell sym->st_info = ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT); 26003a5f9f0SMark Johnston sym->st_other = ELF32_ST_VISIBILITY(STV_HIDDEN); 2616ff6d951SJohn Birrell sym->st_shndx = ESHDR_DOF; 2626ff6d951SJohn Birrell sym++; 2636ff6d951SJohn Birrell 2646ff6d951SJohn Birrell if (dtp->dt_lazyload) { 2656ff6d951SJohn Birrell bcopy(DOFLAZYSTR, dep->de_strtab + strtabsz, 2666ff6d951SJohn Birrell sizeof (DOFLAZYSTR)); 2676ff6d951SJohn Birrell strtabsz += sizeof (DOFLAZYSTR); 2686ff6d951SJohn Birrell } else { 2696ff6d951SJohn Birrell bcopy(DOFSTR, dep->de_strtab + strtabsz, sizeof (DOFSTR)); 2706ff6d951SJohn Birrell strtabsz += sizeof (DOFSTR); 2716ff6d951SJohn Birrell } 2726ff6d951SJohn Birrell 2736ff6d951SJohn Birrell assert(count == dep->de_nrel); 2746ff6d951SJohn Birrell assert(strtabsz == dep->de_strlen); 2756ff6d951SJohn Birrell 2766ff6d951SJohn Birrell return (0); 2776ff6d951SJohn Birrell } 2786ff6d951SJohn Birrell 2796ff6d951SJohn Birrell 2806ff6d951SJohn Birrell typedef struct dof_elf64 { 2816ff6d951SJohn Birrell uint32_t de_nrel; 2826ff6d951SJohn Birrell Elf64_Rela *de_rel; 2836ff6d951SJohn Birrell uint32_t de_nsym; 2846ff6d951SJohn Birrell Elf64_Sym *de_sym; 2856ff6d951SJohn Birrell 2866ff6d951SJohn Birrell uint32_t de_strlen; 2876ff6d951SJohn Birrell char *de_strtab; 2886ff6d951SJohn Birrell 2896ff6d951SJohn Birrell uint32_t de_global; 2906ff6d951SJohn Birrell } dof_elf64_t; 2916ff6d951SJohn Birrell 2926ff6d951SJohn Birrell static int 2936ff6d951SJohn Birrell prepare_elf64(dtrace_hdl_t *dtp, const dof_hdr_t *dof, dof_elf64_t *dep) 2946ff6d951SJohn Birrell { 2956ff6d951SJohn Birrell dof_sec_t *dofs, *s; 2966ff6d951SJohn Birrell dof_relohdr_t *dofrh; 2976ff6d951SJohn Birrell dof_relodesc_t *dofr; 2986ff6d951SJohn Birrell char *strtab; 2996ff6d951SJohn Birrell int i, j, nrel; 3006ff6d951SJohn Birrell size_t strtabsz = 1; 3018caf8a8dSMark Johnston uint64_t count = 0; 3026ff6d951SJohn Birrell size_t base; 3036ff6d951SJohn Birrell Elf64_Sym *sym; 3046ff6d951SJohn Birrell Elf64_Rela *rel; 3056ff6d951SJohn Birrell 3066ff6d951SJohn Birrell /*LINTED*/ 3076ff6d951SJohn Birrell dofs = (dof_sec_t *)((char *)dof + dof->dofh_secoff); 3086ff6d951SJohn Birrell 3096ff6d951SJohn Birrell /* 3106ff6d951SJohn Birrell * First compute the size of the string table and the number of 3116ff6d951SJohn Birrell * relocations present in the DOF. 3126ff6d951SJohn Birrell */ 3136ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 3146ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 3156ff6d951SJohn Birrell continue; 3166ff6d951SJohn Birrell 3176ff6d951SJohn Birrell /*LINTED*/ 3186ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 3196ff6d951SJohn Birrell 3206ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 3216ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 3226ff6d951SJohn Birrell assert(strtab[0] == '\0'); 3236ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 3246ff6d951SJohn Birrell 3256ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 3266ff6d951SJohn Birrell /*LINTED*/ 3276ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 3286ff6d951SJohn Birrell count += s->dofs_size / s->dofs_entsize; 3296ff6d951SJohn Birrell } 3306ff6d951SJohn Birrell 3316ff6d951SJohn Birrell dep->de_strlen = strtabsz; 3326ff6d951SJohn Birrell dep->de_nrel = count; 3336ff6d951SJohn Birrell dep->de_nsym = count + 1; /* the first symbol is always null */ 3346ff6d951SJohn Birrell 3356ff6d951SJohn Birrell if (dtp->dt_lazyload) { 3366ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFLAZYSTR); 3376ff6d951SJohn Birrell dep->de_nsym++; 3386ff6d951SJohn Birrell } else { 3396ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFSTR); 3406ff6d951SJohn Birrell dep->de_nsym++; 3416ff6d951SJohn Birrell } 3426ff6d951SJohn Birrell 3436ff6d951SJohn Birrell if ((dep->de_rel = calloc(dep->de_nrel, 3446ff6d951SJohn Birrell sizeof (dep->de_rel[0]))) == NULL) { 3456ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 3466ff6d951SJohn Birrell } 3476ff6d951SJohn Birrell 3486ff6d951SJohn Birrell if ((dep->de_sym = calloc(dep->de_nsym, sizeof (Elf64_Sym))) == NULL) { 3496ff6d951SJohn Birrell free(dep->de_rel); 3506ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 3516ff6d951SJohn Birrell } 3526ff6d951SJohn Birrell 3536ff6d951SJohn Birrell if ((dep->de_strtab = calloc(dep->de_strlen, 1)) == NULL) { 3546ff6d951SJohn Birrell free(dep->de_rel); 3556ff6d951SJohn Birrell free(dep->de_sym); 3566ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 3576ff6d951SJohn Birrell } 3586ff6d951SJohn Birrell 3596ff6d951SJohn Birrell count = 0; 3606ff6d951SJohn Birrell strtabsz = 1; 3616ff6d951SJohn Birrell dep->de_strtab[0] = '\0'; 3626ff6d951SJohn Birrell rel = dep->de_rel; 3636ff6d951SJohn Birrell sym = dep->de_sym; 3646ff6d951SJohn Birrell dep->de_global = 1; 3656ff6d951SJohn Birrell 3666ff6d951SJohn Birrell /* 3676ff6d951SJohn Birrell * The first symbol table entry must be zeroed and is always ignored. 3686ff6d951SJohn Birrell */ 3696ff6d951SJohn Birrell bzero(sym, sizeof (Elf64_Sym)); 3706ff6d951SJohn Birrell sym++; 3716ff6d951SJohn Birrell 3726ff6d951SJohn Birrell /* 3736ff6d951SJohn Birrell * Take a second pass through the DOF sections filling in the 3746ff6d951SJohn Birrell * memory we allocated. 3756ff6d951SJohn Birrell */ 3766ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 3776ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 3786ff6d951SJohn Birrell continue; 3796ff6d951SJohn Birrell 3806ff6d951SJohn Birrell /*LINTED*/ 3816ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 3826ff6d951SJohn Birrell 3836ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 3846ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 3856ff6d951SJohn Birrell bcopy(strtab + 1, dep->de_strtab + strtabsz, s->dofs_size); 3866ff6d951SJohn Birrell base = strtabsz; 3876ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 3886ff6d951SJohn Birrell 3896ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 3906ff6d951SJohn Birrell /*LINTED*/ 3916ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 3926ff6d951SJohn Birrell nrel = s->dofs_size / s->dofs_entsize; 3936ff6d951SJohn Birrell 3946ff6d951SJohn Birrell s = &dofs[dofrh->dofr_tgtsec]; 3956ff6d951SJohn Birrell 3966ff6d951SJohn Birrell for (j = 0; j < nrel; j++) { 397b78ee15eSRuslan Bukin #if defined(__aarch64__) 398a2ea7849SMark Johnston rel->r_offset = s->dofs_offset + 399a2ea7849SMark Johnston dofr[j].dofr_offset; 400a2ea7849SMark Johnston rel->r_info = ELF64_R_INFO(count + dep->de_global, 401a2ea7849SMark Johnston R_AARCH64_PREL64); 402b78ee15eSRuslan Bukin #elif defined(__arm__) 4032693feb4SJohn Birrell /* XXX */ 4042693feb4SJohn Birrell #elif defined(__mips__) 4052693feb4SJohn Birrell /* XXX */ 4062693feb4SJohn Birrell #elif defined(__powerpc__) 40730b318b9SJustin Hibbits rel->r_offset = s->dofs_offset + 40830b318b9SJustin Hibbits dofr[j].dofr_offset; 40930b318b9SJustin Hibbits rel->r_info = ELF64_R_INFO(count + dep->de_global, 41030b318b9SJustin Hibbits R_PPC64_REL64); 411ca20f8ecSRuslan Bukin #elif defined(__riscv) 412fed1ca4bSRuslan Bukin /* XXX */ 4132693feb4SJohn Birrell #elif defined(__i386) || defined(__amd64) 4146ff6d951SJohn Birrell rel->r_offset = s->dofs_offset + 4156ff6d951SJohn Birrell dofr[j].dofr_offset; 4166ff6d951SJohn Birrell rel->r_info = ELF64_R_INFO(count + dep->de_global, 417e801af6fSMark Johnston R_X86_64_PC64); 4186ff6d951SJohn Birrell #else 4196ff6d951SJohn Birrell #error unknown ISA 4206ff6d951SJohn Birrell #endif 4216ff6d951SJohn Birrell 4226ff6d951SJohn Birrell sym->st_name = base + dofr[j].dofr_name - 1; 4236ff6d951SJohn Birrell sym->st_value = 0; 4246ff6d951SJohn Birrell sym->st_size = 0; 4256ff6d951SJohn Birrell sym->st_info = GELF_ST_INFO(STB_GLOBAL, STT_FUNC); 426df7165b8SMark Johnston sym->st_other = ELF64_ST_VISIBILITY(STV_HIDDEN); 4276ff6d951SJohn Birrell sym->st_shndx = SHN_UNDEF; 4286ff6d951SJohn Birrell 4296ff6d951SJohn Birrell rel++; 4306ff6d951SJohn Birrell sym++; 4316ff6d951SJohn Birrell count++; 4326ff6d951SJohn Birrell } 4336ff6d951SJohn Birrell } 4346ff6d951SJohn Birrell 4356ff6d951SJohn Birrell /* 4366ff6d951SJohn Birrell * Add a symbol for the DOF itself. We use a different symbol for 4376ff6d951SJohn Birrell * lazily and actively loaded DOF to make them easy to distinguish. 4386ff6d951SJohn Birrell */ 4396ff6d951SJohn Birrell sym->st_name = strtabsz; 4406ff6d951SJohn Birrell sym->st_value = 0; 4416ff6d951SJohn Birrell sym->st_size = dof->dofh_filesz; 4426ff6d951SJohn Birrell sym->st_info = GELF_ST_INFO(STB_GLOBAL, STT_OBJECT); 44303a5f9f0SMark Johnston sym->st_other = ELF64_ST_VISIBILITY(STV_HIDDEN); 4446ff6d951SJohn Birrell sym->st_shndx = ESHDR_DOF; 4456ff6d951SJohn Birrell sym++; 4466ff6d951SJohn Birrell 4476ff6d951SJohn Birrell if (dtp->dt_lazyload) { 4486ff6d951SJohn Birrell bcopy(DOFLAZYSTR, dep->de_strtab + strtabsz, 4496ff6d951SJohn Birrell sizeof (DOFLAZYSTR)); 4506ff6d951SJohn Birrell strtabsz += sizeof (DOFLAZYSTR); 4516ff6d951SJohn Birrell } else { 4526ff6d951SJohn Birrell bcopy(DOFSTR, dep->de_strtab + strtabsz, sizeof (DOFSTR)); 4536ff6d951SJohn Birrell strtabsz += sizeof (DOFSTR); 4546ff6d951SJohn Birrell } 4556ff6d951SJohn Birrell 4566ff6d951SJohn Birrell assert(count == dep->de_nrel); 4576ff6d951SJohn Birrell assert(strtabsz == dep->de_strlen); 4586ff6d951SJohn Birrell 4596ff6d951SJohn Birrell return (0); 4606ff6d951SJohn Birrell } 4616ff6d951SJohn Birrell 4626ff6d951SJohn Birrell /* 4636ff6d951SJohn Birrell * Write out an ELF32 file prologue consisting of a header, section headers, 4646ff6d951SJohn Birrell * and a section header string table. The DOF data will follow this prologue 4656ff6d951SJohn Birrell * and complete the contents of the given ELF file. 4666ff6d951SJohn Birrell */ 4676ff6d951SJohn Birrell static int 4686ff6d951SJohn Birrell dump_elf32(dtrace_hdl_t *dtp, const dof_hdr_t *dof, int fd) 4696ff6d951SJohn Birrell { 4706ff6d951SJohn Birrell struct { 4716ff6d951SJohn Birrell Elf32_Ehdr ehdr; 4726ff6d951SJohn Birrell Elf32_Shdr shdr[ESHDR_NUM]; 4736ff6d951SJohn Birrell } elf_file; 4746ff6d951SJohn Birrell 4756ff6d951SJohn Birrell Elf32_Shdr *shp; 4766ff6d951SJohn Birrell Elf32_Off off; 4776ff6d951SJohn Birrell dof_elf32_t de; 4786ff6d951SJohn Birrell int ret = 0; 4796ff6d951SJohn Birrell uint_t nshdr; 4806ff6d951SJohn Birrell 4816ff6d951SJohn Birrell if (prepare_elf32(dtp, dof, &de) != 0) 4826ff6d951SJohn Birrell return (-1); /* errno is set for us */ 4836ff6d951SJohn Birrell 4846ff6d951SJohn Birrell /* 4856ff6d951SJohn Birrell * If there are no relocations, we only need enough sections for 4866ff6d951SJohn Birrell * the shstrtab and the DOF. 4876ff6d951SJohn Birrell */ 4886ff6d951SJohn Birrell nshdr = de.de_nrel == 0 ? ESHDR_SYMTAB + 1 : ESHDR_NUM; 4896ff6d951SJohn Birrell 4906ff6d951SJohn Birrell bzero(&elf_file, sizeof (elf_file)); 4916ff6d951SJohn Birrell 4926ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG0] = ELFMAG0; 4936ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG1] = ELFMAG1; 4946ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG2] = ELFMAG2; 4956ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG3] = ELFMAG3; 4966ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_VERSION] = EV_CURRENT; 4976ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_CLASS] = ELFCLASS32; 4982693feb4SJohn Birrell #if BYTE_ORDER == _BIG_ENDIAN 4996ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2MSB; 5002693feb4SJohn Birrell #else 5016ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2LSB; 5026ff6d951SJohn Birrell #endif 5032693feb4SJohn Birrell elf_file.ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 5046ff6d951SJohn Birrell elf_file.ehdr.e_type = ET_REL; 5052693feb4SJohn Birrell #if defined(__arm__) 5062693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_ARM; 5072693feb4SJohn Birrell #elif defined(__mips__) 5082693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_MIPS; 5092693feb4SJohn Birrell #elif defined(__powerpc__) 5102693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_PPC; 5116ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 5126ff6d951SJohn Birrell elf_file.ehdr.e_machine = EM_386; 513a2ea7849SMark Johnston #elif defined(__aarch64__) 514a2ea7849SMark Johnston elf_file.ehdr.e_machine = EM_AARCH64; 5156ff6d951SJohn Birrell #endif 5166ff6d951SJohn Birrell elf_file.ehdr.e_version = EV_CURRENT; 5176ff6d951SJohn Birrell elf_file.ehdr.e_shoff = sizeof (Elf32_Ehdr); 5186ff6d951SJohn Birrell elf_file.ehdr.e_ehsize = sizeof (Elf32_Ehdr); 5196ff6d951SJohn Birrell elf_file.ehdr.e_phentsize = sizeof (Elf32_Phdr); 5206ff6d951SJohn Birrell elf_file.ehdr.e_shentsize = sizeof (Elf32_Shdr); 5216ff6d951SJohn Birrell elf_file.ehdr.e_shnum = nshdr; 5226ff6d951SJohn Birrell elf_file.ehdr.e_shstrndx = ESHDR_SHSTRTAB; 5236ff6d951SJohn Birrell off = sizeof (elf_file) + nshdr * sizeof (Elf32_Shdr); 5246ff6d951SJohn Birrell 5256ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SHSTRTAB]; 5266ff6d951SJohn Birrell shp->sh_name = 1; /* DTRACE_SHSTRTAB32[1] = ".shstrtab" */ 5276ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 5286ff6d951SJohn Birrell shp->sh_offset = off; 5296ff6d951SJohn Birrell shp->sh_size = sizeof (DTRACE_SHSTRTAB32); 5306ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 5310e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 8); 5326ff6d951SJohn Birrell 5336ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_DOF]; 5346ff6d951SJohn Birrell shp->sh_name = 11; /* DTRACE_SHSTRTAB32[11] = ".SUNW_dof" */ 5356ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 5366ff6d951SJohn Birrell shp->sh_type = SHT_SUNW_dof; 5376ff6d951SJohn Birrell shp->sh_offset = off; 5386ff6d951SJohn Birrell shp->sh_size = dof->dofh_filesz; 5396ff6d951SJohn Birrell shp->sh_addralign = 8; 5406ff6d951SJohn Birrell off = shp->sh_offset + shp->sh_size; 5416ff6d951SJohn Birrell 5426ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_STRTAB]; 5436ff6d951SJohn Birrell shp->sh_name = 21; /* DTRACE_SHSTRTAB32[21] = ".strtab" */ 5446ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 5456ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 5466ff6d951SJohn Birrell shp->sh_offset = off; 5476ff6d951SJohn Birrell shp->sh_size = de.de_strlen; 5486ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 5490e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 4); 5506ff6d951SJohn Birrell 5516ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SYMTAB]; 5526ff6d951SJohn Birrell shp->sh_name = 29; /* DTRACE_SHSTRTAB32[29] = ".symtab" */ 5536ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 5546ff6d951SJohn Birrell shp->sh_type = SHT_SYMTAB; 5556ff6d951SJohn Birrell shp->sh_entsize = sizeof (Elf32_Sym); 5566ff6d951SJohn Birrell shp->sh_link = ESHDR_STRTAB; 5576ff6d951SJohn Birrell shp->sh_offset = off; 5586ff6d951SJohn Birrell shp->sh_info = de.de_global; 5596ff6d951SJohn Birrell shp->sh_size = de.de_nsym * sizeof (Elf32_Sym); 5606ff6d951SJohn Birrell shp->sh_addralign = 4; 5610e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 4); 5626ff6d951SJohn Birrell 5636ff6d951SJohn Birrell if (de.de_nrel == 0) { 5646ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 5656ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 5666ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB32) || 5676ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 5686ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 5696ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 5706ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 5716ff6d951SJohn Birrell } 5726ff6d951SJohn Birrell } else { 5736ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_REL]; 5746ff6d951SJohn Birrell shp->sh_name = 37; /* DTRACE_SHSTRTAB32[37] = ".rel.SUNW_dof" */ 5756ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 5766ff6d951SJohn Birrell shp->sh_type = SHT_REL; 5776ff6d951SJohn Birrell shp->sh_entsize = sizeof (de.de_rel[0]); 5786ff6d951SJohn Birrell shp->sh_link = ESHDR_SYMTAB; 5796ff6d951SJohn Birrell shp->sh_info = ESHDR_DOF; 5806ff6d951SJohn Birrell shp->sh_offset = off; 5816ff6d951SJohn Birrell shp->sh_size = de.de_nrel * sizeof (de.de_rel[0]); 5826ff6d951SJohn Birrell shp->sh_addralign = 4; 5836ff6d951SJohn Birrell 5846ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 5856ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 5866ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB32) || 5876ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 5886ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 5896ff6d951SJohn Birrell PWRITE_SCN(ESHDR_REL, de.de_rel) || 5906ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 5916ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 5926ff6d951SJohn Birrell } 5936ff6d951SJohn Birrell } 5946ff6d951SJohn Birrell 5956ff6d951SJohn Birrell free(de.de_strtab); 5966ff6d951SJohn Birrell free(de.de_sym); 5976ff6d951SJohn Birrell free(de.de_rel); 5986ff6d951SJohn Birrell 5996ff6d951SJohn Birrell return (ret); 6006ff6d951SJohn Birrell } 6016ff6d951SJohn Birrell 6026ff6d951SJohn Birrell /* 6036ff6d951SJohn Birrell * Write out an ELF64 file prologue consisting of a header, section headers, 6046ff6d951SJohn Birrell * and a section header string table. The DOF data will follow this prologue 6056ff6d951SJohn Birrell * and complete the contents of the given ELF file. 6066ff6d951SJohn Birrell */ 6076ff6d951SJohn Birrell static int 6086ff6d951SJohn Birrell dump_elf64(dtrace_hdl_t *dtp, const dof_hdr_t *dof, int fd) 6096ff6d951SJohn Birrell { 6106ff6d951SJohn Birrell struct { 6116ff6d951SJohn Birrell Elf64_Ehdr ehdr; 6126ff6d951SJohn Birrell Elf64_Shdr shdr[ESHDR_NUM]; 6136ff6d951SJohn Birrell } elf_file; 6146ff6d951SJohn Birrell 6156ff6d951SJohn Birrell Elf64_Shdr *shp; 6166ff6d951SJohn Birrell Elf64_Off off; 6176ff6d951SJohn Birrell dof_elf64_t de; 6186ff6d951SJohn Birrell int ret = 0; 6196ff6d951SJohn Birrell uint_t nshdr; 6206ff6d951SJohn Birrell 6216ff6d951SJohn Birrell if (prepare_elf64(dtp, dof, &de) != 0) 6226ff6d951SJohn Birrell return (-1); /* errno is set for us */ 6236ff6d951SJohn Birrell 6246ff6d951SJohn Birrell /* 6256ff6d951SJohn Birrell * If there are no relocations, we only need enough sections for 6266ff6d951SJohn Birrell * the shstrtab and the DOF. 6276ff6d951SJohn Birrell */ 6286ff6d951SJohn Birrell nshdr = de.de_nrel == 0 ? ESHDR_SYMTAB + 1 : ESHDR_NUM; 6296ff6d951SJohn Birrell 6306ff6d951SJohn Birrell bzero(&elf_file, sizeof (elf_file)); 6316ff6d951SJohn Birrell 6326ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG0] = ELFMAG0; 6336ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG1] = ELFMAG1; 6346ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG2] = ELFMAG2; 6356ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG3] = ELFMAG3; 6366ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_VERSION] = EV_CURRENT; 6376ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_CLASS] = ELFCLASS64; 6382693feb4SJohn Birrell #if BYTE_ORDER == _BIG_ENDIAN 6396ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2MSB; 6402693feb4SJohn Birrell #else 6416ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2LSB; 6426ff6d951SJohn Birrell #endif 6432693feb4SJohn Birrell elf_file.ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 6446ff6d951SJohn Birrell elf_file.ehdr.e_type = ET_REL; 6452693feb4SJohn Birrell #if defined(__arm__) 6462693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_ARM; 6472693feb4SJohn Birrell #elif defined(__mips__) 6482693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_MIPS; 649b08e2b04SJustin Hibbits #elif defined(__powerpc64__) 6507283901aSBrandon Bergren #if defined(_CALL_ELF) && _CALL_ELF == 2 6517283901aSBrandon Bergren elf_file.ehdr.e_flags = 2; 6527283901aSBrandon Bergren #endif 653b08e2b04SJustin Hibbits elf_file.ehdr.e_machine = EM_PPC64; 6546ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 6556ff6d951SJohn Birrell elf_file.ehdr.e_machine = EM_AMD64; 656a2ea7849SMark Johnston #elif defined(__aarch64__) 657a2ea7849SMark Johnston elf_file.ehdr.e_machine = EM_AARCH64; 6586ff6d951SJohn Birrell #endif 6596ff6d951SJohn Birrell elf_file.ehdr.e_version = EV_CURRENT; 6606ff6d951SJohn Birrell elf_file.ehdr.e_shoff = sizeof (Elf64_Ehdr); 6616ff6d951SJohn Birrell elf_file.ehdr.e_ehsize = sizeof (Elf64_Ehdr); 6626ff6d951SJohn Birrell elf_file.ehdr.e_phentsize = sizeof (Elf64_Phdr); 6636ff6d951SJohn Birrell elf_file.ehdr.e_shentsize = sizeof (Elf64_Shdr); 6646ff6d951SJohn Birrell elf_file.ehdr.e_shnum = nshdr; 6656ff6d951SJohn Birrell elf_file.ehdr.e_shstrndx = ESHDR_SHSTRTAB; 6666ff6d951SJohn Birrell off = sizeof (elf_file) + nshdr * sizeof (Elf64_Shdr); 6676ff6d951SJohn Birrell 6686ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SHSTRTAB]; 6696ff6d951SJohn Birrell shp->sh_name = 1; /* DTRACE_SHSTRTAB64[1] = ".shstrtab" */ 6706ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 6716ff6d951SJohn Birrell shp->sh_offset = off; 6726ff6d951SJohn Birrell shp->sh_size = sizeof (DTRACE_SHSTRTAB64); 6736ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 6740e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 8); 6756ff6d951SJohn Birrell 6766ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_DOF]; 6776ff6d951SJohn Birrell shp->sh_name = 11; /* DTRACE_SHSTRTAB64[11] = ".SUNW_dof" */ 6786ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 6796ff6d951SJohn Birrell shp->sh_type = SHT_SUNW_dof; 6806ff6d951SJohn Birrell shp->sh_offset = off; 6816ff6d951SJohn Birrell shp->sh_size = dof->dofh_filesz; 6826ff6d951SJohn Birrell shp->sh_addralign = 8; 6836ff6d951SJohn Birrell off = shp->sh_offset + shp->sh_size; 6846ff6d951SJohn Birrell 6856ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_STRTAB]; 6866ff6d951SJohn Birrell shp->sh_name = 21; /* DTRACE_SHSTRTAB64[21] = ".strtab" */ 6876ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 6886ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 6896ff6d951SJohn Birrell shp->sh_offset = off; 6906ff6d951SJohn Birrell shp->sh_size = de.de_strlen; 6916ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 6920e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 8); 6936ff6d951SJohn Birrell 6946ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SYMTAB]; 6956ff6d951SJohn Birrell shp->sh_name = 29; /* DTRACE_SHSTRTAB64[29] = ".symtab" */ 6966ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 6976ff6d951SJohn Birrell shp->sh_type = SHT_SYMTAB; 6986ff6d951SJohn Birrell shp->sh_entsize = sizeof (Elf64_Sym); 6996ff6d951SJohn Birrell shp->sh_link = ESHDR_STRTAB; 7006ff6d951SJohn Birrell shp->sh_offset = off; 7016ff6d951SJohn Birrell shp->sh_info = de.de_global; 7026ff6d951SJohn Birrell shp->sh_size = de.de_nsym * sizeof (Elf64_Sym); 7036ff6d951SJohn Birrell shp->sh_addralign = 8; 7040e15d9fbSMark Johnston off = roundup2(shp->sh_offset + shp->sh_size, 8); 7056ff6d951SJohn Birrell 7066ff6d951SJohn Birrell if (de.de_nrel == 0) { 7076ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 7086ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 7096ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB64) || 7106ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 7116ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 7126ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 7136ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 7146ff6d951SJohn Birrell } 7156ff6d951SJohn Birrell } else { 7166ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_REL]; 7176ff6d951SJohn Birrell shp->sh_name = 37; /* DTRACE_SHSTRTAB64[37] = ".rel.SUNW_dof" */ 7186ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 7196ff6d951SJohn Birrell shp->sh_type = SHT_RELA; 7206ff6d951SJohn Birrell shp->sh_entsize = sizeof (de.de_rel[0]); 7216ff6d951SJohn Birrell shp->sh_link = ESHDR_SYMTAB; 7226ff6d951SJohn Birrell shp->sh_info = ESHDR_DOF; 7236ff6d951SJohn Birrell shp->sh_offset = off; 7246ff6d951SJohn Birrell shp->sh_size = de.de_nrel * sizeof (de.de_rel[0]); 7256ff6d951SJohn Birrell shp->sh_addralign = 8; 7266ff6d951SJohn Birrell 7276ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 7286ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 7296ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB64) || 7306ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 7316ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 7326ff6d951SJohn Birrell PWRITE_SCN(ESHDR_REL, de.de_rel) || 7336ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 7346ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 7356ff6d951SJohn Birrell } 7366ff6d951SJohn Birrell } 7376ff6d951SJohn Birrell 7386ff6d951SJohn Birrell free(de.de_strtab); 7396ff6d951SJohn Birrell free(de.de_sym); 7406ff6d951SJohn Birrell free(de.de_rel); 7416ff6d951SJohn Birrell 7426ff6d951SJohn Birrell return (ret); 7436ff6d951SJohn Birrell } 7446ff6d951SJohn Birrell 7456ff6d951SJohn Birrell static int 746e801af6fSMark Johnston dt_symtab_lookup(Elf_Data *data_sym, int start, int end, uintptr_t addr, 747e801af6fSMark Johnston uint_t shn, GElf_Sym *sym, int uses_funcdesc, Elf *elf) 7486ff6d951SJohn Birrell { 749b08e2b04SJustin Hibbits Elf64_Addr symval; 750b08e2b04SJustin Hibbits Elf_Scn *opd_scn; 751b08e2b04SJustin Hibbits Elf_Data *opd_desc; 752e801af6fSMark Johnston int i; 7536ff6d951SJohn Birrell 754e801af6fSMark Johnston for (i = start; i < end && gelf_getsym(data_sym, i, sym) != NULL; i++) { 755b08e2b04SJustin Hibbits if (GELF_ST_TYPE(sym->st_info) == STT_FUNC) { 756b08e2b04SJustin Hibbits symval = sym->st_value; 757b08e2b04SJustin Hibbits if (uses_funcdesc) { 758b08e2b04SJustin Hibbits opd_scn = elf_getscn(elf, sym->st_shndx); 759b08e2b04SJustin Hibbits opd_desc = elf_rawdata(opd_scn, NULL); 760b08e2b04SJustin Hibbits symval = 761b08e2b04SJustin Hibbits *(uint64_t*)((char *)opd_desc->d_buf + symval); 762b08e2b04SJustin Hibbits } 763b08e2b04SJustin Hibbits if ((uses_funcdesc || shn == sym->st_shndx) && 764e801af6fSMark Johnston symval <= addr && addr < symval + sym->st_size) 7656ff6d951SJohn Birrell return (0); 7666ff6d951SJohn Birrell } 767b08e2b04SJustin Hibbits } 7686ff6d951SJohn Birrell 769e801af6fSMark Johnston return (-1); 7706ff6d951SJohn Birrell } 7716ff6d951SJohn Birrell 772b78ee15eSRuslan Bukin #if defined(__aarch64__) 773a2ea7849SMark Johnston #define DT_OP_NOP 0xd503201f 774a2ea7849SMark Johnston #define DT_OP_RET 0xd65f03c0 775a2ea7849SMark Johnston #define DT_OP_CALL26 0x94000000 776a2ea7849SMark Johnston #define DT_OP_JUMP26 0x14000000 777e627909dSMark Johnston #define DT_REL_NONE R_AARCH64_NONE 778a2ea7849SMark Johnston 779b78ee15eSRuslan Bukin static int 780b78ee15eSRuslan Bukin dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 781b78ee15eSRuslan Bukin uint32_t *off) 782b78ee15eSRuslan Bukin { 783a2ea7849SMark Johnston uint32_t *ip; 784a2ea7849SMark Johnston 785a2ea7849SMark Johnston /* 786a2ea7849SMark Johnston * Ensure that the offset is aligned on an instruction boundary. 787a2ea7849SMark Johnston */ 788a2ea7849SMark Johnston if ((rela->r_offset & (sizeof (uint32_t) - 1)) != 0) 7894e4805ddSEd Maste return (-1); 790a2ea7849SMark Johnston 791a2ea7849SMark Johnston /* 792a2ea7849SMark Johnston * We only know about some specific relocation types. 793a2ea7849SMark Johnston * We also recognize relocation type NONE, since that gets used for 794a2ea7849SMark Johnston * relocations of USDT probes, and we might be re-processing a file. 795a2ea7849SMark Johnston */ 796a2ea7849SMark Johnston if (GELF_R_TYPE(rela->r_info) != R_AARCH64_CALL26 && 797a2ea7849SMark Johnston GELF_R_TYPE(rela->r_info) != R_AARCH64_JUMP26 && 798a2ea7849SMark Johnston GELF_R_TYPE(rela->r_info) != R_AARCH64_NONE) 799a2ea7849SMark Johnston return (-1); 800a2ea7849SMark Johnston 801a2ea7849SMark Johnston ip = (uint32_t *)(p + rela->r_offset); 802a2ea7849SMark Johnston 803a2ea7849SMark Johnston /* 804a2ea7849SMark Johnston * We may have already processed this object file in an earlier linker 805a2ea7849SMark Johnston * invocation. Check to see if the present instruction sequence matches 806a2ea7849SMark Johnston * the one we would install below. 807a2ea7849SMark Johnston */ 808a2ea7849SMark Johnston if (ip[0] == DT_OP_NOP || ip[0] == DT_OP_RET) 809a2ea7849SMark Johnston return (0); 810a2ea7849SMark Johnston 811a2ea7849SMark Johnston /* 812a2ea7849SMark Johnston * We only expect call instructions with a displacement of 0, or a jump 813a2ea7849SMark Johnston * instruction acting as a tail call. 814a2ea7849SMark Johnston */ 815a2ea7849SMark Johnston if (ip[0] != DT_OP_CALL26 && ip[0] != DT_OP_JUMP26) { 816a2ea7849SMark Johnston dt_dprintf("found %x instead of a call or jmp instruction at " 817a2ea7849SMark Johnston "%llx\n", ip[0], (u_longlong_t)rela->r_offset); 818a2ea7849SMark Johnston return (-1); 819a2ea7849SMark Johnston } 820a2ea7849SMark Johnston 821a2ea7849SMark Johnston /* 822a2ea7849SMark Johnston * On arm64, we do not have to differentiate between regular probes and 823a2ea7849SMark Johnston * is-enabled probes. Both cases are encoded as a regular branch for 824a2ea7849SMark Johnston * non-tail call locations, and a jump for tail call locations. Calls 825a2ea7849SMark Johnston * are to be converted into a no-op whereas jumps should become a 826a2ea7849SMark Johnston * return. 827a2ea7849SMark Johnston */ 828a2ea7849SMark Johnston if (ip[0] == DT_OP_CALL26) 829a2ea7849SMark Johnston ip[0] = DT_OP_NOP; 830a2ea7849SMark Johnston else 831a2ea7849SMark Johnston ip[0] = DT_OP_RET; 832a2ea7849SMark Johnston 833a2ea7849SMark Johnston return (0); 834b78ee15eSRuslan Bukin } 835b78ee15eSRuslan Bukin #elif defined(__arm__) 836d2d16e56SMark Johnston #define DT_REL_NONE R_ARM_NONE 837d2d16e56SMark Johnston 8382693feb4SJohn Birrell static int 8392693feb4SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 8402693feb4SJohn Birrell uint32_t *off) 8412693feb4SJohn Birrell { 842732f2c69SEd Maste printf("%s:%s(%d): arm not implemented\n", __FUNCTION__, __FILE__, 843732f2c69SEd Maste __LINE__); 8444e4805ddSEd Maste return (-1); 8452693feb4SJohn Birrell } 8462693feb4SJohn Birrell #elif defined(__mips__) 847d2d16e56SMark Johnston #define DT_REL_NONE R_MIPS_NONE 848d2d16e56SMark Johnston 8492693feb4SJohn Birrell static int 8502693feb4SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 8512693feb4SJohn Birrell uint32_t *off) 8522693feb4SJohn Birrell { 853732f2c69SEd Maste printf("%s:%s(%d): MIPS not implemented\n", __FUNCTION__, __FILE__, 854732f2c69SEd Maste __LINE__); 8554e4805ddSEd Maste return (-1); 8562693feb4SJohn Birrell } 8572693feb4SJohn Birrell #elif defined(__powerpc__) 85830b318b9SJustin Hibbits /* The sentinel is 'xor r3,r3,r3'. */ 85930b318b9SJustin Hibbits #define DT_OP_XOR_R3 0x7c631a78 86030b318b9SJustin Hibbits 86130b318b9SJustin Hibbits #define DT_OP_NOP 0x60000000 86230b318b9SJustin Hibbits #define DT_OP_BLR 0x4e800020 86330b318b9SJustin Hibbits 86430b318b9SJustin Hibbits /* This captures all forms of branching to address. */ 86530b318b9SJustin Hibbits #define DT_IS_BRANCH(inst) ((inst & 0xfc000000) == 0x48000000) 86630b318b9SJustin Hibbits #define DT_IS_BL(inst) (DT_IS_BRANCH(inst) && (inst & 0x01)) 86730b318b9SJustin Hibbits 868d2d16e56SMark Johnston #define DT_REL_NONE R_PPC_NONE 869d2d16e56SMark Johnston 8702693feb4SJohn Birrell static int 8712693feb4SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 8722693feb4SJohn Birrell uint32_t *off) 8732693feb4SJohn Birrell { 87430b318b9SJustin Hibbits uint32_t *ip; 87530b318b9SJustin Hibbits 87630b318b9SJustin Hibbits if ((rela->r_offset & (sizeof (uint32_t) - 1)) != 0) 87730b318b9SJustin Hibbits return (-1); 87830b318b9SJustin Hibbits 87930b318b9SJustin Hibbits /*LINTED*/ 88030b318b9SJustin Hibbits ip = (uint32_t *)(p + rela->r_offset); 88130b318b9SJustin Hibbits 88230b318b9SJustin Hibbits /* 88330b318b9SJustin Hibbits * We only know about some specific relocation types. 88430b318b9SJustin Hibbits */ 88530b318b9SJustin Hibbits if (GELF_R_TYPE(rela->r_info) != R_PPC_REL24 && 886d2d16e56SMark Johnston GELF_R_TYPE(rela->r_info) != R_PPC_PLTREL24 && 887d2d16e56SMark Johnston GELF_R_TYPE(rela->r_info) != R_PPC_NONE) 88830b318b9SJustin Hibbits return (-1); 88930b318b9SJustin Hibbits 89030b318b9SJustin Hibbits /* 89130b318b9SJustin Hibbits * We may have already processed this object file in an earlier linker 89230b318b9SJustin Hibbits * invocation. Check to see if the present instruction sequence matches 89330b318b9SJustin Hibbits * the one we would install below. 89430b318b9SJustin Hibbits */ 89530b318b9SJustin Hibbits if (isenabled) { 89630b318b9SJustin Hibbits if (ip[0] == DT_OP_XOR_R3) { 89730b318b9SJustin Hibbits (*off) += sizeof (ip[0]); 89830b318b9SJustin Hibbits return (0); 89930b318b9SJustin Hibbits } 90030b318b9SJustin Hibbits } else { 90130b318b9SJustin Hibbits if (ip[0] == DT_OP_NOP) { 90230b318b9SJustin Hibbits (*off) += sizeof (ip[0]); 90330b318b9SJustin Hibbits return (0); 90430b318b9SJustin Hibbits } 90530b318b9SJustin Hibbits } 90630b318b9SJustin Hibbits 90730b318b9SJustin Hibbits /* 90830b318b9SJustin Hibbits * We only expect branch to address instructions. 90930b318b9SJustin Hibbits */ 91030b318b9SJustin Hibbits if (!DT_IS_BRANCH(ip[0])) { 91130b318b9SJustin Hibbits dt_dprintf("found %x instead of a branch instruction at %llx\n", 91230b318b9SJustin Hibbits ip[0], (u_longlong_t)rela->r_offset); 91330b318b9SJustin Hibbits return (-1); 91430b318b9SJustin Hibbits } 91530b318b9SJustin Hibbits 91630b318b9SJustin Hibbits if (isenabled) { 91730b318b9SJustin Hibbits /* 91830b318b9SJustin Hibbits * It would necessarily indicate incorrect usage if an is- 91930b318b9SJustin Hibbits * enabled probe were tail-called so flag that as an error. 92030b318b9SJustin Hibbits * It's also potentially (very) tricky to handle gracefully, 92130b318b9SJustin Hibbits * but could be done if this were a desired use scenario. 92230b318b9SJustin Hibbits */ 92330b318b9SJustin Hibbits if (!DT_IS_BL(ip[0])) { 92430b318b9SJustin Hibbits dt_dprintf("tail call to is-enabled probe at %llx\n", 92530b318b9SJustin Hibbits (u_longlong_t)rela->r_offset); 92630b318b9SJustin Hibbits return (-1); 92730b318b9SJustin Hibbits } 92830b318b9SJustin Hibbits 92930b318b9SJustin Hibbits ip[0] = DT_OP_XOR_R3; 93030b318b9SJustin Hibbits (*off) += sizeof (ip[0]); 93130b318b9SJustin Hibbits } else { 93230b318b9SJustin Hibbits if (DT_IS_BL(ip[0])) 93330b318b9SJustin Hibbits ip[0] = DT_OP_NOP; 93430b318b9SJustin Hibbits else 93530b318b9SJustin Hibbits ip[0] = DT_OP_BLR; 93630b318b9SJustin Hibbits } 93730b318b9SJustin Hibbits 9382693feb4SJohn Birrell return (0); 9392693feb4SJohn Birrell } 940ca20f8ecSRuslan Bukin #elif defined(__riscv) 941d2d16e56SMark Johnston #define DT_REL_NONE R_RISCV_NONE 942fed1ca4bSRuslan Bukin static int 943fed1ca4bSRuslan Bukin dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 944fed1ca4bSRuslan Bukin uint32_t *off) 945fed1ca4bSRuslan Bukin { 946732f2c69SEd Maste printf("%s:%s(%d): RISC-V implementation required\n", __FUNCTION__, 947732f2c69SEd Maste __FILE__, __LINE__); 9484e4805ddSEd Maste return (-1); 949fed1ca4bSRuslan Bukin } 9506ff6d951SJohn Birrell 9516ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 9526ff6d951SJohn Birrell 9536ff6d951SJohn Birrell #define DT_OP_NOP 0x90 9542693feb4SJohn Birrell #define DT_OP_RET 0xc3 9556ff6d951SJohn Birrell #define DT_OP_CALL 0xe8 9562693feb4SJohn Birrell #define DT_OP_JMP32 0xe9 9576ff6d951SJohn Birrell #define DT_OP_REX_RAX 0x48 9586ff6d951SJohn Birrell #define DT_OP_XOR_EAX_0 0x33 9596ff6d951SJohn Birrell #define DT_OP_XOR_EAX_1 0xc0 9606ff6d951SJohn Birrell 961d2d16e56SMark Johnston #define DT_REL_NONE R_386_NONE 962d2d16e56SMark Johnston 9636ff6d951SJohn Birrell static int 9646ff6d951SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 9656ff6d951SJohn Birrell uint32_t *off) 9666ff6d951SJohn Birrell { 9676ff6d951SJohn Birrell uint8_t *ip = (uint8_t *)(p + rela->r_offset - 1); 9682693feb4SJohn Birrell uint8_t ret; 9696ff6d951SJohn Birrell 9706ff6d951SJohn Birrell /* 9716ff6d951SJohn Birrell * On x86, the first byte of the instruction is the call opcode and 9726ff6d951SJohn Birrell * the next four bytes are the 32-bit address; the relocation is for 9736ff6d951SJohn Birrell * the address operand. We back up the offset to the first byte of 9746ff6d951SJohn Birrell * the instruction. For is-enabled probes, we later advance the offset 9756ff6d951SJohn Birrell * so that it hits the first nop in the instruction sequence. 9766ff6d951SJohn Birrell */ 9776ff6d951SJohn Birrell (*off) -= 1; 9786ff6d951SJohn Birrell 9796ff6d951SJohn Birrell /* 9806ff6d951SJohn Birrell * We only know about some specific relocation types. Luckily 9816ff6d951SJohn Birrell * these types have the same values on both 32-bit and 64-bit 9826ff6d951SJohn Birrell * x86 architectures. 9836ff6d951SJohn Birrell */ 9846ff6d951SJohn Birrell if (GELF_R_TYPE(rela->r_info) != R_386_PC32 && 985d2d16e56SMark Johnston GELF_R_TYPE(rela->r_info) != R_386_PLT32 && 986d2d16e56SMark Johnston GELF_R_TYPE(rela->r_info) != R_386_NONE) 9876ff6d951SJohn Birrell return (-1); 9886ff6d951SJohn Birrell 9896ff6d951SJohn Birrell /* 9906ff6d951SJohn Birrell * We may have already processed this object file in an earlier linker 9916ff6d951SJohn Birrell * invocation. Check to see if the present instruction sequence matches 9926ff6d951SJohn Birrell * the one we would install. For is-enabled probes, we advance the 9932693feb4SJohn Birrell * offset to the first nop instruction in the sequence to match the 9942693feb4SJohn Birrell * text modification code below. 9956ff6d951SJohn Birrell */ 9966ff6d951SJohn Birrell if (!isenabled) { 9972693feb4SJohn Birrell if ((ip[0] == DT_OP_NOP || ip[0] == DT_OP_RET) && 9982693feb4SJohn Birrell ip[1] == DT_OP_NOP && ip[2] == DT_OP_NOP && 9992693feb4SJohn Birrell ip[3] == DT_OP_NOP && ip[4] == DT_OP_NOP) 10006ff6d951SJohn Birrell return (0); 10016ff6d951SJohn Birrell } else if (dtp->dt_oflags & DTRACE_O_LP64) { 10026ff6d951SJohn Birrell if (ip[0] == DT_OP_REX_RAX && 10036ff6d951SJohn Birrell ip[1] == DT_OP_XOR_EAX_0 && ip[2] == DT_OP_XOR_EAX_1 && 10042693feb4SJohn Birrell (ip[3] == DT_OP_NOP || ip[3] == DT_OP_RET) && 10052693feb4SJohn Birrell ip[4] == DT_OP_NOP) { 10066ff6d951SJohn Birrell (*off) += 3; 10076ff6d951SJohn Birrell return (0); 10086ff6d951SJohn Birrell } 10096ff6d951SJohn Birrell } else { 10106ff6d951SJohn Birrell if (ip[0] == DT_OP_XOR_EAX_0 && ip[1] == DT_OP_XOR_EAX_1 && 10112693feb4SJohn Birrell (ip[2] == DT_OP_NOP || ip[2] == DT_OP_RET) && 10122693feb4SJohn Birrell ip[3] == DT_OP_NOP && ip[4] == DT_OP_NOP) { 10136ff6d951SJohn Birrell (*off) += 2; 10146ff6d951SJohn Birrell return (0); 10156ff6d951SJohn Birrell } 10166ff6d951SJohn Birrell } 10176ff6d951SJohn Birrell 10186ff6d951SJohn Birrell /* 10192693feb4SJohn Birrell * We expect either a call instrution with a 32-bit displacement or a 10202693feb4SJohn Birrell * jmp instruction with a 32-bit displacement acting as a tail-call. 10216ff6d951SJohn Birrell */ 10222693feb4SJohn Birrell if (ip[0] != DT_OP_CALL && ip[0] != DT_OP_JMP32) { 10232693feb4SJohn Birrell dt_dprintf("found %x instead of a call or jmp instruction at " 10242693feb4SJohn Birrell "%llx\n", ip[0], (u_longlong_t)rela->r_offset); 10256ff6d951SJohn Birrell return (-1); 10266ff6d951SJohn Birrell } 10276ff6d951SJohn Birrell 10282693feb4SJohn Birrell ret = (ip[0] == DT_OP_JMP32) ? DT_OP_RET : DT_OP_NOP; 10292693feb4SJohn Birrell 10306ff6d951SJohn Birrell /* 10316ff6d951SJohn Birrell * Establish the instruction sequence -- all nops for probes, and an 10326ff6d951SJohn Birrell * instruction to clear the return value register (%eax/%rax) followed 10336ff6d951SJohn Birrell * by nops for is-enabled probes. For is-enabled probes, we advance 10346ff6d951SJohn Birrell * the offset to the first nop. This isn't stricly necessary but makes 10356ff6d951SJohn Birrell * for more readable disassembly when the probe is enabled. 10366ff6d951SJohn Birrell */ 10376ff6d951SJohn Birrell if (!isenabled) { 10382693feb4SJohn Birrell ip[0] = ret; 10396ff6d951SJohn Birrell ip[1] = DT_OP_NOP; 10406ff6d951SJohn Birrell ip[2] = DT_OP_NOP; 10416ff6d951SJohn Birrell ip[3] = DT_OP_NOP; 10426ff6d951SJohn Birrell ip[4] = DT_OP_NOP; 10436ff6d951SJohn Birrell } else if (dtp->dt_oflags & DTRACE_O_LP64) { 10446ff6d951SJohn Birrell ip[0] = DT_OP_REX_RAX; 10456ff6d951SJohn Birrell ip[1] = DT_OP_XOR_EAX_0; 10466ff6d951SJohn Birrell ip[2] = DT_OP_XOR_EAX_1; 10472693feb4SJohn Birrell ip[3] = ret; 10486ff6d951SJohn Birrell ip[4] = DT_OP_NOP; 10496ff6d951SJohn Birrell (*off) += 3; 10506ff6d951SJohn Birrell } else { 10516ff6d951SJohn Birrell ip[0] = DT_OP_XOR_EAX_0; 10526ff6d951SJohn Birrell ip[1] = DT_OP_XOR_EAX_1; 10532693feb4SJohn Birrell ip[2] = ret; 10546ff6d951SJohn Birrell ip[3] = DT_OP_NOP; 10556ff6d951SJohn Birrell ip[4] = DT_OP_NOP; 10566ff6d951SJohn Birrell (*off) += 2; 10576ff6d951SJohn Birrell } 10586ff6d951SJohn Birrell 10596ff6d951SJohn Birrell return (0); 10606ff6d951SJohn Birrell } 10616ff6d951SJohn Birrell 10626ff6d951SJohn Birrell #else 10636ff6d951SJohn Birrell #error unknown ISA 10646ff6d951SJohn Birrell #endif 10656ff6d951SJohn Birrell 10666ff6d951SJohn Birrell /*PRINTFLIKE5*/ 10676ff6d951SJohn Birrell static int 10686ff6d951SJohn Birrell dt_link_error(dtrace_hdl_t *dtp, Elf *elf, int fd, dt_link_pair_t *bufs, 10696ff6d951SJohn Birrell const char *format, ...) 10706ff6d951SJohn Birrell { 10716ff6d951SJohn Birrell va_list ap; 10726ff6d951SJohn Birrell dt_link_pair_t *pair; 10736ff6d951SJohn Birrell 10746ff6d951SJohn Birrell va_start(ap, format); 10756ff6d951SJohn Birrell dt_set_errmsg(dtp, NULL, NULL, NULL, 0, format, ap); 10766ff6d951SJohn Birrell va_end(ap); 10776ff6d951SJohn Birrell 10786ff6d951SJohn Birrell if (elf != NULL) 10796ff6d951SJohn Birrell (void) elf_end(elf); 10806ff6d951SJohn Birrell 10816ff6d951SJohn Birrell if (fd >= 0) 10826ff6d951SJohn Birrell (void) close(fd); 10836ff6d951SJohn Birrell 10846ff6d951SJohn Birrell while ((pair = bufs) != NULL) { 10856ff6d951SJohn Birrell bufs = pair->dlp_next; 10866ff6d951SJohn Birrell dt_free(dtp, pair->dlp_str); 10876ff6d951SJohn Birrell dt_free(dtp, pair->dlp_sym); 10886ff6d951SJohn Birrell dt_free(dtp, pair); 10896ff6d951SJohn Birrell } 10906ff6d951SJohn Birrell 10916ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_COMPILER)); 10926ff6d951SJohn Birrell } 10936ff6d951SJohn Birrell 1094938acb08SMark Johnston /* 1095938acb08SMark Johnston * Provide a unique identifier used when adding global symbols to an object. 1096938acb08SMark Johnston * This is the FNV-1a hash of an absolute path for the file. 1097938acb08SMark Johnston */ 1098938acb08SMark Johnston static unsigned int 1099938acb08SMark Johnston hash_obj(const char *obj, int fd) 1100938acb08SMark Johnston { 1101938acb08SMark Johnston char path[PATH_MAX]; 1102938acb08SMark Johnston unsigned int h; 1103938acb08SMark Johnston 1104938acb08SMark Johnston if (realpath(obj, path) == NULL) 1105938acb08SMark Johnston return (-1); 1106938acb08SMark Johnston 1107938acb08SMark Johnston for (h = 2166136261u, obj = &path[0]; *obj != '\0'; obj++) 1108938acb08SMark Johnston h = (h ^ *obj) * 16777619; 1109938acb08SMark Johnston h &= 0x7fffffff; 1110938acb08SMark Johnston return (h); 1111938acb08SMark Johnston } 1112938acb08SMark Johnston 11136ff6d951SJohn Birrell static int 11146ff6d951SJohn Birrell process_obj(dtrace_hdl_t *dtp, const char *obj, int *eprobesp) 11156ff6d951SJohn Birrell { 11166ff6d951SJohn Birrell static const char dt_prefix[] = "__dtrace"; 11176ff6d951SJohn Birrell static const char dt_enabled[] = "enabled"; 11186ff6d951SJohn Birrell static const char dt_symprefix[] = "$dtrace"; 1119938acb08SMark Johnston static const char dt_symfmt[] = "%s%u.%s"; 1120281e4f2dSMark Johnston static const char dt_weaksymfmt[] = "%s.%s"; 11213a3e3279SMark Johnston char probename[DTRACE_NAMELEN]; 11227283901aSBrandon Bergren int fd, i, ndx, eprobe, uses_funcdesc = 0, mod = 0; 11236ff6d951SJohn Birrell Elf *elf = NULL; 11246ff6d951SJohn Birrell GElf_Ehdr ehdr; 11256ff6d951SJohn Birrell Elf_Scn *scn_rel, *scn_sym, *scn_str, *scn_tgt; 11266ff6d951SJohn Birrell Elf_Data *data_rel, *data_sym, *data_str, *data_tgt; 11276ff6d951SJohn Birrell GElf_Shdr shdr_rel, shdr_sym, shdr_str, shdr_tgt; 11286ff6d951SJohn Birrell GElf_Sym rsym, fsym, dsym; 11296ff6d951SJohn Birrell GElf_Rela rela; 11306ff6d951SJohn Birrell char *s, *p, *r; 11316ff6d951SJohn Birrell char pname[DTRACE_PROVNAMELEN]; 11326ff6d951SJohn Birrell dt_provider_t *pvp; 11336ff6d951SJohn Birrell dt_probe_t *prp; 11346ff6d951SJohn Birrell uint32_t off, eclass, emachine1, emachine2; 1135e801af6fSMark Johnston size_t symsize, osym, nsym, isym, istr, len; 1136938acb08SMark Johnston unsigned int objkey; 11376ff6d951SJohn Birrell dt_link_pair_t *pair, *bufs = NULL; 11386ff6d951SJohn Birrell dt_strtab_t *strtab; 1139273efb05SMark Johnston void *tmp; 11406ff6d951SJohn Birrell 11416ff6d951SJohn Birrell if ((fd = open64(obj, O_RDWR)) == -1) { 11426ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 11436ff6d951SJohn Birrell "failed to open %s: %s", obj, strerror(errno))); 11446ff6d951SJohn Birrell } 11456ff6d951SJohn Birrell 11466ff6d951SJohn Birrell if ((elf = elf_begin(fd, ELF_C_RDWR, NULL)) == NULL) { 11476ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 11486ff6d951SJohn Birrell "failed to process %s: %s", obj, elf_errmsg(elf_errno()))); 11496ff6d951SJohn Birrell } 11506ff6d951SJohn Birrell 11516ff6d951SJohn Birrell switch (elf_kind(elf)) { 11526ff6d951SJohn Birrell case ELF_K_ELF: 11536ff6d951SJohn Birrell break; 11546ff6d951SJohn Birrell case ELF_K_AR: 11556ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, "archives are not " 11566ff6d951SJohn Birrell "permitted; use the contents of the archive instead: %s", 11576ff6d951SJohn Birrell obj)); 11586ff6d951SJohn Birrell default: 11596ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 11606ff6d951SJohn Birrell "invalid file type: %s", obj)); 11616ff6d951SJohn Birrell } 11626ff6d951SJohn Birrell 11636ff6d951SJohn Birrell if (gelf_getehdr(elf, &ehdr) == NULL) { 11646ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, "corrupt file: %s", 11656ff6d951SJohn Birrell obj)); 11666ff6d951SJohn Birrell } 11676ff6d951SJohn Birrell 11686ff6d951SJohn Birrell if (dtp->dt_oflags & DTRACE_O_LP64) { 11696ff6d951SJohn Birrell eclass = ELFCLASS64; 1170e7d939bdSMarcel Moolenaar #if defined(__mips__) 11712693feb4SJohn Birrell emachine1 = emachine2 = EM_MIPS; 11722693feb4SJohn Birrell #elif defined(__powerpc__) 11732693feb4SJohn Birrell emachine1 = emachine2 = EM_PPC64; 11747283901aSBrandon Bergren #if !defined(_CALL_ELF) || _CALL_ELF == 1 11757283901aSBrandon Bergren uses_funcdesc = 1; 11767283901aSBrandon Bergren #endif 11776ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 11786ff6d951SJohn Birrell emachine1 = emachine2 = EM_AMD64; 1179a2ea7849SMark Johnston #elif defined(__aarch64__) 1180a2ea7849SMark Johnston emachine1 = emachine2 = EM_AARCH64; 11816ff6d951SJohn Birrell #endif 11826ff6d951SJohn Birrell symsize = sizeof (Elf64_Sym); 11836ff6d951SJohn Birrell } else { 11846ff6d951SJohn Birrell eclass = ELFCLASS32; 11852693feb4SJohn Birrell #if defined(__arm__) 11862693feb4SJohn Birrell emachine1 = emachine2 = EM_ARM; 11872693feb4SJohn Birrell #elif defined(__mips__) 11882693feb4SJohn Birrell emachine1 = emachine2 = EM_MIPS; 11892693feb4SJohn Birrell #elif defined(__powerpc__) 11902693feb4SJohn Birrell emachine1 = emachine2 = EM_PPC; 1191e7d939bdSMarcel Moolenaar #elif defined(__i386) || defined(__amd64) 11926ff6d951SJohn Birrell emachine1 = emachine2 = EM_386; 11936ff6d951SJohn Birrell #endif 11946ff6d951SJohn Birrell symsize = sizeof (Elf32_Sym); 11956ff6d951SJohn Birrell } 11966ff6d951SJohn Birrell 11976ff6d951SJohn Birrell if (ehdr.e_ident[EI_CLASS] != eclass) { 11986ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 11996ff6d951SJohn Birrell "incorrect ELF class for object file: %s", obj)); 12006ff6d951SJohn Birrell } 12016ff6d951SJohn Birrell 12026ff6d951SJohn Birrell if (ehdr.e_machine != emachine1 && ehdr.e_machine != emachine2) { 12036ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 12046ff6d951SJohn Birrell "incorrect ELF machine type for object file: %s", obj)); 12056ff6d951SJohn Birrell } 12066ff6d951SJohn Birrell 12076ff6d951SJohn Birrell /* 12086ff6d951SJohn Birrell * We use this token as a relatively unique handle for this file on the 12096ff6d951SJohn Birrell * system in order to disambiguate potential conflicts between files of 12106ff6d951SJohn Birrell * the same name which contain identially named local symbols. 12116ff6d951SJohn Birrell */ 1212938acb08SMark Johnston if ((objkey = hash_obj(obj, fd)) == (unsigned int)-1) 12136ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 12146ff6d951SJohn Birrell "failed to generate unique key for object file: %s", obj)); 12156ff6d951SJohn Birrell 12166ff6d951SJohn Birrell scn_rel = NULL; 12176ff6d951SJohn Birrell while ((scn_rel = elf_nextscn(elf, scn_rel)) != NULL) { 12186ff6d951SJohn Birrell if (gelf_getshdr(scn_rel, &shdr_rel) == NULL) 12196ff6d951SJohn Birrell goto err; 12206ff6d951SJohn Birrell 12216ff6d951SJohn Birrell /* 12226ff6d951SJohn Birrell * Skip any non-relocation sections. 12236ff6d951SJohn Birrell */ 12246ff6d951SJohn Birrell if (shdr_rel.sh_type != SHT_RELA && shdr_rel.sh_type != SHT_REL) 12256ff6d951SJohn Birrell continue; 12266ff6d951SJohn Birrell 12276ff6d951SJohn Birrell if ((data_rel = elf_getdata(scn_rel, NULL)) == NULL) 12286ff6d951SJohn Birrell goto err; 12296ff6d951SJohn Birrell 12306ff6d951SJohn Birrell /* 12316ff6d951SJohn Birrell * Grab the section, section header and section data for the 12326ff6d951SJohn Birrell * symbol table that this relocation section references. 12336ff6d951SJohn Birrell */ 12346ff6d951SJohn Birrell if ((scn_sym = elf_getscn(elf, shdr_rel.sh_link)) == NULL || 12356ff6d951SJohn Birrell gelf_getshdr(scn_sym, &shdr_sym) == NULL || 12366ff6d951SJohn Birrell (data_sym = elf_getdata(scn_sym, NULL)) == NULL) 12376ff6d951SJohn Birrell goto err; 12386ff6d951SJohn Birrell 12396ff6d951SJohn Birrell /* 12406ff6d951SJohn Birrell * Ditto for that symbol table's string table. 12416ff6d951SJohn Birrell */ 12426ff6d951SJohn Birrell if ((scn_str = elf_getscn(elf, shdr_sym.sh_link)) == NULL || 12436ff6d951SJohn Birrell gelf_getshdr(scn_str, &shdr_str) == NULL || 12446ff6d951SJohn Birrell (data_str = elf_getdata(scn_str, NULL)) == NULL) 12456ff6d951SJohn Birrell goto err; 12466ff6d951SJohn Birrell 12476ff6d951SJohn Birrell /* 12486ff6d951SJohn Birrell * Grab the section, section header and section data for the 12496ff6d951SJohn Birrell * target section for the relocations. For the relocations 12506ff6d951SJohn Birrell * we're looking for -- this will typically be the text of the 12516ff6d951SJohn Birrell * object file. 12526ff6d951SJohn Birrell */ 12536ff6d951SJohn Birrell if ((scn_tgt = elf_getscn(elf, shdr_rel.sh_info)) == NULL || 12546ff6d951SJohn Birrell gelf_getshdr(scn_tgt, &shdr_tgt) == NULL || 12556ff6d951SJohn Birrell (data_tgt = elf_getdata(scn_tgt, NULL)) == NULL) 12566ff6d951SJohn Birrell goto err; 12576ff6d951SJohn Birrell 12586ff6d951SJohn Birrell /* 12596ff6d951SJohn Birrell * We're looking for relocations to symbols matching this form: 12606ff6d951SJohn Birrell * 12616ff6d951SJohn Birrell * __dtrace[enabled]_<prov>___<probe> 12626ff6d951SJohn Birrell * 12636ff6d951SJohn Birrell * For the generated object, we need to record the location 12646ff6d951SJohn Birrell * identified by the relocation, and create a new relocation 12656ff6d951SJohn Birrell * in the generated object that will be resolved at link time 12666ff6d951SJohn Birrell * to the location of the function in which the probe is 12676ff6d951SJohn Birrell * embedded. In the target object, we change the matched symbol 12686ff6d951SJohn Birrell * so that it will be ignored at link time, and we modify the 12696ff6d951SJohn Birrell * target (text) section to replace the call instruction with 12706ff6d951SJohn Birrell * one or more nops. 12716ff6d951SJohn Birrell * 1272e801af6fSMark Johnston * To avoid runtime overhead, the relocations added to the 1273e801af6fSMark Johnston * generated object should be resolved at static link time. We 1274e801af6fSMark Johnston * therefore create aliases for the functions that contain 1275e801af6fSMark Johnston * probes. An alias is global (so that the relocation from the 1276e801af6fSMark Johnston * generated object can be resolved), and hidden (so that its 1277e801af6fSMark Johnston * address is known at static link time). Such aliases have this 1278e801af6fSMark Johnston * form: 12796ff6d951SJohn Birrell * 12806ff6d951SJohn Birrell * $dtrace<key>.<function> 12816ff6d951SJohn Birrell * 12826ff6d951SJohn Birrell * We take a first pass through all the relocations to 12836ff6d951SJohn Birrell * populate our string table and count the number of extra 12846ff6d951SJohn Birrell * symbols we'll require. 1285d2d16e56SMark Johnston * 1286d2d16e56SMark Johnston * We also handle the case where the object has already been 1287d2d16e56SMark Johnston * processed, to support incremental rebuilds. Relocations 1288d2d16e56SMark Johnston * of interest are converted to type NONE, but all information 1289d2d16e56SMark Johnston * needed to reconstruct the output DOF is retained. 12906ff6d951SJohn Birrell */ 12916ff6d951SJohn Birrell strtab = dt_strtab_create(1); 12926ff6d951SJohn Birrell nsym = 0; 12936ff6d951SJohn Birrell isym = data_sym->d_size / symsize; 12946ff6d951SJohn Birrell istr = data_str->d_size; 12956ff6d951SJohn Birrell 12966ff6d951SJohn Birrell for (i = 0; i < shdr_rel.sh_size / shdr_rel.sh_entsize; i++) { 12976ff6d951SJohn Birrell if (shdr_rel.sh_type == SHT_RELA) { 12986ff6d951SJohn Birrell if (gelf_getrela(data_rel, i, &rela) == NULL) 12996ff6d951SJohn Birrell continue; 13006ff6d951SJohn Birrell } else { 13016ff6d951SJohn Birrell GElf_Rel rel; 13026ff6d951SJohn Birrell if (gelf_getrel(data_rel, i, &rel) == NULL) 13036ff6d951SJohn Birrell continue; 13046ff6d951SJohn Birrell rela.r_offset = rel.r_offset; 13056ff6d951SJohn Birrell rela.r_info = rel.r_info; 13066ff6d951SJohn Birrell rela.r_addend = 0; 13076ff6d951SJohn Birrell } 13086ff6d951SJohn Birrell 13096ff6d951SJohn Birrell if (gelf_getsym(data_sym, GELF_R_SYM(rela.r_info), 13106ff6d951SJohn Birrell &rsym) == NULL) { 13116ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13126ff6d951SJohn Birrell goto err; 13136ff6d951SJohn Birrell } 13146ff6d951SJohn Birrell 13156ff6d951SJohn Birrell s = (char *)data_str->d_buf + rsym.st_name; 13166ff6d951SJohn Birrell 13176ff6d951SJohn Birrell if (strncmp(s, dt_prefix, sizeof (dt_prefix) - 1) != 0) 13186ff6d951SJohn Birrell continue; 13196ff6d951SJohn Birrell 1320e801af6fSMark Johnston if (dt_symtab_lookup(data_sym, 0, isym, rela.r_offset, 13217283901aSBrandon Bergren shdr_rel.sh_info, &fsym, uses_funcdesc, 1322e801af6fSMark Johnston elf) != 0) { 13236ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13246ff6d951SJohn Birrell goto err; 13256ff6d951SJohn Birrell } 13266ff6d951SJohn Birrell 13276ff6d951SJohn Birrell if (fsym.st_name > data_str->d_size) { 13286ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13296ff6d951SJohn Birrell goto err; 13306ff6d951SJohn Birrell } 13316ff6d951SJohn Birrell 13326ff6d951SJohn Birrell s = (char *)data_str->d_buf + fsym.st_name; 13336ff6d951SJohn Birrell 13346ff6d951SJohn Birrell /* 13356ff6d951SJohn Birrell * If this symbol isn't of type function, we've really 13366ff6d951SJohn Birrell * driven off the rails or the object file is corrupt. 13376ff6d951SJohn Birrell */ 13386ff6d951SJohn Birrell if (GELF_ST_TYPE(fsym.st_info) != STT_FUNC) { 13396ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13406ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 13416ff6d951SJohn Birrell "expected %s to be of type function", s)); 13426ff6d951SJohn Birrell } 13436ff6d951SJohn Birrell 1344ad1633b3SMark Johnston /* 1345ad1633b3SMark Johnston * Aliases of weak symbols don't get a uniquifier. 1346ad1633b3SMark Johnston */ 1347d00431a7SMark Johnston if (GELF_ST_BIND(fsym.st_info) == STB_WEAK) { 1348ad1633b3SMark Johnston len = snprintf(NULL, 0, dt_weaksymfmt, 1349ad1633b3SMark Johnston dt_symprefix, s) + 1; 1350d00431a7SMark Johnston } else { 13516ff6d951SJohn Birrell len = snprintf(NULL, 0, dt_symfmt, dt_symprefix, 13526ff6d951SJohn Birrell objkey, s) + 1; 1353d00431a7SMark Johnston } 13546ff6d951SJohn Birrell if ((p = dt_alloc(dtp, len)) == NULL) { 13556ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13566ff6d951SJohn Birrell goto err; 13576ff6d951SJohn Birrell } 1358d00431a7SMark Johnston if (GELF_ST_BIND(fsym.st_info) == STB_WEAK) { 1359d00431a7SMark Johnston (void) snprintf(p, len, dt_weaksymfmt, 1360d00431a7SMark Johnston dt_symprefix, s); 1361d00431a7SMark Johnston } else { 13626ff6d951SJohn Birrell (void) snprintf(p, len, dt_symfmt, dt_symprefix, 13636ff6d951SJohn Birrell objkey, s); 1364d00431a7SMark Johnston } 13656ff6d951SJohn Birrell 13666ff6d951SJohn Birrell if (dt_strtab_index(strtab, p) == -1) { 1367d2d16e56SMark Johnston /* 1368d2d16e56SMark Johnston * Do not add new symbols if this object file 1369d2d16e56SMark Johnston * has already been processed. 1370d2d16e56SMark Johnston */ 1371d2d16e56SMark Johnston if (GELF_R_TYPE(rela.r_info) != DT_REL_NONE) 13726ff6d951SJohn Birrell nsym++; 13736ff6d951SJohn Birrell (void) dt_strtab_insert(strtab, p); 13746ff6d951SJohn Birrell } 13756ff6d951SJohn Birrell 13766ff6d951SJohn Birrell dt_free(dtp, p); 13776ff6d951SJohn Birrell } 13786ff6d951SJohn Birrell 13796ff6d951SJohn Birrell /* 1380d2d16e56SMark Johnston * If any new probes were found, allocate the additional space 1381d2d16e56SMark Johnston * for the symbol table and string table, copying the old data 1382d2d16e56SMark Johnston * into the new buffers, and marking the buffers as dirty. We 1383d2d16e56SMark Johnston * inject those newly allocated buffers into the libelf data 1384e801af6fSMark Johnston * structures, but are still responsible for freeing them once 1385e801af6fSMark Johnston * we're done with the elf handle. 13866ff6d951SJohn Birrell */ 1387d2d16e56SMark Johnston osym = isym; 13886ff6d951SJohn Birrell if (nsym > 0) { 13896ff6d951SJohn Birrell /* 13906ff6d951SJohn Birrell * The first byte of the string table is reserved for 13916ff6d951SJohn Birrell * the \0 entry. 13926ff6d951SJohn Birrell */ 13936ff6d951SJohn Birrell len = dt_strtab_size(strtab) - 1; 13946ff6d951SJohn Birrell 13956ff6d951SJohn Birrell assert(len > 0); 13966ff6d951SJohn Birrell assert(dt_strtab_index(strtab, "") == 0); 13976ff6d951SJohn Birrell 13986ff6d951SJohn Birrell dt_strtab_destroy(strtab); 13996ff6d951SJohn Birrell 14006ff6d951SJohn Birrell if ((pair = dt_alloc(dtp, sizeof (*pair))) == NULL) 14016ff6d951SJohn Birrell goto err; 14026ff6d951SJohn Birrell 14036ff6d951SJohn Birrell if ((pair->dlp_str = dt_alloc(dtp, data_str->d_size + 14046ff6d951SJohn Birrell len)) == NULL) { 14056ff6d951SJohn Birrell dt_free(dtp, pair); 14066ff6d951SJohn Birrell goto err; 14076ff6d951SJohn Birrell } 14086ff6d951SJohn Birrell 14096ff6d951SJohn Birrell if ((pair->dlp_sym = dt_alloc(dtp, data_sym->d_size + 14106ff6d951SJohn Birrell nsym * symsize)) == NULL) { 14116ff6d951SJohn Birrell dt_free(dtp, pair->dlp_str); 14126ff6d951SJohn Birrell dt_free(dtp, pair); 14136ff6d951SJohn Birrell goto err; 14146ff6d951SJohn Birrell } 14156ff6d951SJohn Birrell 14166ff6d951SJohn Birrell pair->dlp_next = bufs; 14176ff6d951SJohn Birrell bufs = pair; 14186ff6d951SJohn Birrell 14196ff6d951SJohn Birrell bcopy(data_str->d_buf, pair->dlp_str, data_str->d_size); 1420273efb05SMark Johnston tmp = data_str->d_buf; 14216ff6d951SJohn Birrell data_str->d_buf = pair->dlp_str; 1422273efb05SMark Johnston pair->dlp_str = tmp; 14236ff6d951SJohn Birrell data_str->d_size += len; 14246ff6d951SJohn Birrell (void) elf_flagdata(data_str, ELF_C_SET, ELF_F_DIRTY); 14256ff6d951SJohn Birrell 14266ff6d951SJohn Birrell shdr_str.sh_size += len; 14276ff6d951SJohn Birrell (void) gelf_update_shdr(scn_str, &shdr_str); 14286ff6d951SJohn Birrell 14296ff6d951SJohn Birrell bcopy(data_sym->d_buf, pair->dlp_sym, data_sym->d_size); 1430273efb05SMark Johnston tmp = data_sym->d_buf; 14316ff6d951SJohn Birrell data_sym->d_buf = pair->dlp_sym; 1432273efb05SMark Johnston pair->dlp_sym = tmp; 14336ff6d951SJohn Birrell data_sym->d_size += nsym * symsize; 14346ff6d951SJohn Birrell (void) elf_flagdata(data_sym, ELF_C_SET, ELF_F_DIRTY); 14356ff6d951SJohn Birrell 14366ff6d951SJohn Birrell shdr_sym.sh_size += nsym * symsize; 14376ff6d951SJohn Birrell (void) gelf_update_shdr(scn_sym, &shdr_sym); 14386ff6d951SJohn Birrell 14396ff6d951SJohn Birrell nsym += isym; 1440d2d16e56SMark Johnston } else if (dt_strtab_empty(strtab)) { 14416ff6d951SJohn Birrell dt_strtab_destroy(strtab); 1442e801af6fSMark Johnston continue; 14436ff6d951SJohn Birrell } 14446ff6d951SJohn Birrell 14456ff6d951SJohn Birrell /* 14466ff6d951SJohn Birrell * Now that the tables have been allocated, perform the 14476ff6d951SJohn Birrell * modifications described above. 14486ff6d951SJohn Birrell */ 14496ff6d951SJohn Birrell for (i = 0; i < shdr_rel.sh_size / shdr_rel.sh_entsize; i++) { 14506ff6d951SJohn Birrell if (shdr_rel.sh_type == SHT_RELA) { 14516ff6d951SJohn Birrell if (gelf_getrela(data_rel, i, &rela) == NULL) 14526ff6d951SJohn Birrell continue; 14536ff6d951SJohn Birrell } else { 14546ff6d951SJohn Birrell GElf_Rel rel; 14556ff6d951SJohn Birrell if (gelf_getrel(data_rel, i, &rel) == NULL) 14566ff6d951SJohn Birrell continue; 14576ff6d951SJohn Birrell rela.r_offset = rel.r_offset; 14586ff6d951SJohn Birrell rela.r_info = rel.r_info; 14596ff6d951SJohn Birrell rela.r_addend = 0; 14606ff6d951SJohn Birrell } 14616ff6d951SJohn Birrell 14626ff6d951SJohn Birrell ndx = GELF_R_SYM(rela.r_info); 14636ff6d951SJohn Birrell 14646ff6d951SJohn Birrell if (gelf_getsym(data_sym, ndx, &rsym) == NULL || 14656ff6d951SJohn Birrell rsym.st_name > data_str->d_size) 14666ff6d951SJohn Birrell goto err; 14676ff6d951SJohn Birrell 14686ff6d951SJohn Birrell s = (char *)data_str->d_buf + rsym.st_name; 14696ff6d951SJohn Birrell 14706ff6d951SJohn Birrell if (strncmp(s, dt_prefix, sizeof (dt_prefix) - 1) != 0) 14716ff6d951SJohn Birrell continue; 14726ff6d951SJohn Birrell 14736ff6d951SJohn Birrell s += sizeof (dt_prefix) - 1; 14746ff6d951SJohn Birrell 14756ff6d951SJohn Birrell /* 14766ff6d951SJohn Birrell * Check to see if this is an 'is-enabled' check as 14776ff6d951SJohn Birrell * opposed to a normal probe. 14786ff6d951SJohn Birrell */ 14796ff6d951SJohn Birrell if (strncmp(s, dt_enabled, 14806ff6d951SJohn Birrell sizeof (dt_enabled) - 1) == 0) { 14816ff6d951SJohn Birrell s += sizeof (dt_enabled) - 1; 14826ff6d951SJohn Birrell eprobe = 1; 14836ff6d951SJohn Birrell *eprobesp = 1; 14846ff6d951SJohn Birrell dt_dprintf("is-enabled probe\n"); 14856ff6d951SJohn Birrell } else { 14866ff6d951SJohn Birrell eprobe = 0; 14876ff6d951SJohn Birrell dt_dprintf("normal probe\n"); 14886ff6d951SJohn Birrell } 14896ff6d951SJohn Birrell 14906ff6d951SJohn Birrell if (*s++ != '_') 14916ff6d951SJohn Birrell goto err; 14926ff6d951SJohn Birrell 14936ff6d951SJohn Birrell if ((p = strstr(s, "___")) == NULL || 14946ff6d951SJohn Birrell p - s >= sizeof (pname)) 14956ff6d951SJohn Birrell goto err; 14966ff6d951SJohn Birrell 14976ff6d951SJohn Birrell bcopy(s, pname, p - s); 14986ff6d951SJohn Birrell pname[p - s] = '\0'; 14996ff6d951SJohn Birrell 1500e801af6fSMark Johnston if (dt_symtab_lookup(data_sym, osym, isym, 1501e801af6fSMark Johnston rela.r_offset, shdr_rel.sh_info, &fsym, 15027283901aSBrandon Bergren uses_funcdesc, elf) == 0) { 15036ff6d951SJohn Birrell if (fsym.st_name > data_str->d_size) 15046ff6d951SJohn Birrell goto err; 15056ff6d951SJohn Birrell 1506281e4f2dSMark Johnston r = s = (char *) data_str->d_buf + fsym.st_name; 1507281e4f2dSMark Johnston assert(strstr(s, dt_symprefix) == s); 1508281e4f2dSMark Johnston s = strchr(s, '.') + 1; 1509281e4f2dSMark Johnston } else if (dt_symtab_lookup(data_sym, 0, osym, 1510281e4f2dSMark Johnston rela.r_offset, shdr_rel.sh_info, &fsym, 15117283901aSBrandon Bergren uses_funcdesc, elf) == 0) { 1512281e4f2dSMark Johnston u_int bind; 1513281e4f2dSMark Johnston 1514281e4f2dSMark Johnston bind = GELF_ST_BIND(fsym.st_info) == STB_WEAK ? 1515281e4f2dSMark Johnston STB_WEAK : STB_GLOBAL; 1516d2d16e56SMark Johnston s = (char *) data_str->d_buf + fsym.st_name; 1517d2d16e56SMark Johnston if (GELF_R_TYPE(rela.r_info) != DT_REL_NONE) { 15186ff6d951SJohn Birrell /* 1519d2d16e56SMark Johnston * Emit an alias for the symbol. It 1520d2d16e56SMark Johnston * needs to be non-preemptible so that 1521d2d16e56SMark Johnston * .SUNW_dof relocations may be resolved 1522d2d16e56SMark Johnston * at static link time. Aliases of weak 1523d2d16e56SMark Johnston * symbols are given a non-unique name 1524d2d16e56SMark Johnston * so that they may be merged by the 1525d2d16e56SMark Johnston * linker. 15266ff6d951SJohn Birrell */ 15276ff6d951SJohn Birrell dsym = fsym; 15286ff6d951SJohn Birrell dsym.st_name = istr; 1529d2d16e56SMark Johnston dsym.st_info = GELF_ST_INFO(bind, 1530d2d16e56SMark Johnston STT_FUNC); 1531d2d16e56SMark Johnston dsym.st_other = 1532d2d16e56SMark Johnston GELF_ST_VISIBILITY(STV_HIDDEN); 1533d2d16e56SMark Johnston (void) gelf_update_sym(data_sym, isym, 1534d2d16e56SMark Johnston &dsym); 15356ff6d951SJohn Birrell isym++; 15366ff6d951SJohn Birrell assert(isym <= nsym); 1537d2d16e56SMark Johnston 1538d2d16e56SMark Johnston r = (char *) data_str->d_buf + istr; 1539d2d16e56SMark Johnston if (bind == STB_WEAK) { 1540d2d16e56SMark Johnston istr += sprintf(r, 1541d2d16e56SMark Johnston dt_weaksymfmt, dt_symprefix, 1542d2d16e56SMark Johnston s); 1543d2d16e56SMark Johnston } else { 1544d2d16e56SMark Johnston istr += sprintf(r, dt_symfmt, 1545d2d16e56SMark Johnston dt_symprefix, objkey, s); 1546d2d16e56SMark Johnston } 1547d2d16e56SMark Johnston istr++; 1548d2d16e56SMark Johnston } else { 1549d2d16e56SMark Johnston if (bind == STB_WEAK) { 1550d2d16e56SMark Johnston (void) asprintf(&r, 1551d2d16e56SMark Johnston dt_weaksymfmt, dt_symprefix, 1552d2d16e56SMark Johnston s); 1553d2d16e56SMark Johnston } else { 1554d2d16e56SMark Johnston (void) asprintf(&r, dt_symfmt, 1555d2d16e56SMark Johnston dt_symprefix, objkey, s); 1556d2d16e56SMark Johnston } 1557d2d16e56SMark Johnston } 1558d2d16e56SMark Johnston } else { 1559281e4f2dSMark Johnston goto err; 1560d2d16e56SMark Johnston } 15616ff6d951SJohn Birrell 15626ff6d951SJohn Birrell if ((pvp = dt_provider_lookup(dtp, pname)) == NULL) { 15636ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 15646ff6d951SJohn Birrell "no such provider %s", pname)); 15656ff6d951SJohn Birrell } 15666ff6d951SJohn Birrell 15673a3e3279SMark Johnston if (strlcpy(probename, p + 3, sizeof (probename)) >= 15683a3e3279SMark Johnston sizeof (probename)) 15696ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 15703a3e3279SMark Johnston "invalid probe name %s", probename)); 15713a3e3279SMark Johnston (void) strhyphenate(probename); 15723a3e3279SMark Johnston if ((prp = dt_probe_lookup(pvp, probename)) == NULL) 15733a3e3279SMark Johnston return (dt_link_error(dtp, elf, fd, bufs, 15743a3e3279SMark Johnston "no such probe %s", probename)); 15756ff6d951SJohn Birrell 15766ff6d951SJohn Birrell assert(fsym.st_value <= rela.r_offset); 15776ff6d951SJohn Birrell 15786ff6d951SJohn Birrell off = rela.r_offset - fsym.st_value; 15796ff6d951SJohn Birrell if (dt_modtext(dtp, data_tgt->d_buf, eprobe, 15800f2bd1e8SRui Paulo &rela, &off) != 0) 15816ff6d951SJohn Birrell goto err; 15826ff6d951SJohn Birrell 15836ff6d951SJohn Birrell if (dt_probe_define(pvp, prp, s, r, off, eprobe) != 0) { 15846ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 15856ff6d951SJohn Birrell "failed to allocate space for probe")); 15866ff6d951SJohn Birrell } 15870e15d9fbSMark Johnston 15880f2bd1e8SRui Paulo /* 1589d2d16e56SMark Johnston * We are done with this relocation, but it must be 1590d2d16e56SMark Johnston * preserved in order to support incremental rebuilds. 15910f2bd1e8SRui Paulo */ 15922b374230SMark Johnston if (shdr_rel.sh_type == SHT_RELA) { 1593c612709bSMark Johnston rela.r_info = GELF_R_INFO( 1594c612709bSMark Johnston GELF_R_SYM(rela.r_info), DT_REL_NONE); 15950f2bd1e8SRui Paulo (void) gelf_update_rela(data_rel, i, &rela); 15962b374230SMark Johnston } else { 15972b374230SMark Johnston GElf_Rel rel; 1598d2d16e56SMark Johnston rel.r_offset = rela.r_offset; 1599c612709bSMark Johnston rel.r_info = GELF_R_INFO( 1600c612709bSMark Johnston GELF_R_SYM(rela.r_info), DT_REL_NONE); 16012b374230SMark Johnston (void) gelf_update_rel(data_rel, i, &rel); 16022b374230SMark Johnston } 16036ff6d951SJohn Birrell 16046ff6d951SJohn Birrell mod = 1; 16056ff6d951SJohn Birrell (void) elf_flagdata(data_tgt, ELF_C_SET, ELF_F_DIRTY); 16066ff6d951SJohn Birrell 16076ff6d951SJohn Birrell /* 16086ff6d951SJohn Birrell * This symbol may already have been marked to 16096ff6d951SJohn Birrell * be ignored by another relocation referencing 16106ff6d951SJohn Birrell * the same symbol or if this object file has 16116ff6d951SJohn Birrell * already been processed by an earlier link 16126ff6d951SJohn Birrell * invocation. 16136ff6d951SJohn Birrell */ 16140e15d9fbSMark Johnston if (rsym.st_shndx != SHN_ABS) { 16150e15d9fbSMark Johnston rsym.st_shndx = SHN_ABS; 16166ff6d951SJohn Birrell (void) gelf_update_sym(data_sym, ndx, &rsym); 16176ff6d951SJohn Birrell } 16186ff6d951SJohn Birrell } 16196ff6d951SJohn Birrell } 16206ff6d951SJohn Birrell 16216ff6d951SJohn Birrell if (mod && elf_update(elf, ELF_C_WRITE) == -1) 16226ff6d951SJohn Birrell goto err; 16236ff6d951SJohn Birrell 16246ff6d951SJohn Birrell (void) elf_end(elf); 16256ff6d951SJohn Birrell (void) close(fd); 16266ff6d951SJohn Birrell 16276ff6d951SJohn Birrell while ((pair = bufs) != NULL) { 16286ff6d951SJohn Birrell bufs = pair->dlp_next; 16296ff6d951SJohn Birrell dt_free(dtp, pair->dlp_str); 16306ff6d951SJohn Birrell dt_free(dtp, pair->dlp_sym); 16316ff6d951SJohn Birrell dt_free(dtp, pair); 16326ff6d951SJohn Birrell } 16336ff6d951SJohn Birrell 16346ff6d951SJohn Birrell return (0); 16356ff6d951SJohn Birrell 16366ff6d951SJohn Birrell err: 16376ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 16386ff6d951SJohn Birrell "an error was encountered while processing %s", obj)); 16396ff6d951SJohn Birrell } 16406ff6d951SJohn Birrell 16416ff6d951SJohn Birrell int 16426ff6d951SJohn Birrell dtrace_program_link(dtrace_hdl_t *dtp, dtrace_prog_t *pgp, uint_t dflags, 16436ff6d951SJohn Birrell const char *file, int objc, char *const objv[]) 16446ff6d951SJohn Birrell { 16452693feb4SJohn Birrell char tfile[PATH_MAX]; 16466ff6d951SJohn Birrell char drti[PATH_MAX]; 16476ff6d951SJohn Birrell dof_hdr_t *dof; 16486ff6d951SJohn Birrell int fd, status, i, cur; 16496ff6d951SJohn Birrell char *cmd, tmp; 16506ff6d951SJohn Birrell size_t len; 16516ff6d951SJohn Birrell int eprobes = 0, ret = 0; 16526ff6d951SJohn Birrell 16536ff6d951SJohn Birrell /* 16546ff6d951SJohn Birrell * A NULL program indicates a special use in which we just link 16556ff6d951SJohn Birrell * together a bunch of object files specified in objv and then 16566ff6d951SJohn Birrell * unlink(2) those object files. 16576ff6d951SJohn Birrell */ 16586ff6d951SJohn Birrell if (pgp == NULL) { 16596ff6d951SJohn Birrell const char *fmt = "%s -o %s -r"; 16606ff6d951SJohn Birrell 16616ff6d951SJohn Birrell len = snprintf(&tmp, 1, fmt, dtp->dt_ld_path, file) + 1; 16626ff6d951SJohn Birrell 16636ff6d951SJohn Birrell for (i = 0; i < objc; i++) 16646ff6d951SJohn Birrell len += strlen(objv[i]) + 1; 16656ff6d951SJohn Birrell 16666ff6d951SJohn Birrell cmd = alloca(len); 16676ff6d951SJohn Birrell 16686ff6d951SJohn Birrell cur = snprintf(cmd, len, fmt, dtp->dt_ld_path, file); 16696ff6d951SJohn Birrell 16706ff6d951SJohn Birrell for (i = 0; i < objc; i++) 16716ff6d951SJohn Birrell cur += snprintf(cmd + cur, len - cur, " %s", objv[i]); 16726ff6d951SJohn Birrell 16736ff6d951SJohn Birrell if ((status = system(cmd)) == -1) { 16746ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 16756ff6d951SJohn Birrell "failed to run %s: %s", dtp->dt_ld_path, 16766ff6d951SJohn Birrell strerror(errno))); 16776ff6d951SJohn Birrell } 16786ff6d951SJohn Birrell 16796ff6d951SJohn Birrell if (WIFSIGNALED(status)) { 16806ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 16816ff6d951SJohn Birrell "failed to link %s: %s failed due to signal %d", 16826ff6d951SJohn Birrell file, dtp->dt_ld_path, WTERMSIG(status))); 16836ff6d951SJohn Birrell } 16846ff6d951SJohn Birrell 16856ff6d951SJohn Birrell if (WEXITSTATUS(status) != 0) { 16866ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 16876ff6d951SJohn Birrell "failed to link %s: %s exited with status %d\n", 16886ff6d951SJohn Birrell file, dtp->dt_ld_path, WEXITSTATUS(status))); 16896ff6d951SJohn Birrell } 16906ff6d951SJohn Birrell 16916ff6d951SJohn Birrell for (i = 0; i < objc; i++) { 16926ff6d951SJohn Birrell if (strcmp(objv[i], file) != 0) 16936ff6d951SJohn Birrell (void) unlink(objv[i]); 16946ff6d951SJohn Birrell } 16956ff6d951SJohn Birrell 16966ff6d951SJohn Birrell return (0); 16976ff6d951SJohn Birrell } 16986ff6d951SJohn Birrell 16996ff6d951SJohn Birrell for (i = 0; i < objc; i++) { 17006ff6d951SJohn Birrell if (process_obj(dtp, objv[i], &eprobes) != 0) 17016ff6d951SJohn Birrell return (-1); /* errno is set for us */ 17026ff6d951SJohn Birrell } 17036ff6d951SJohn Birrell 17046ff6d951SJohn Birrell /* 17056ff6d951SJohn Birrell * If there are is-enabled probes then we need to force use of DOF 17066ff6d951SJohn Birrell * version 2. 17076ff6d951SJohn Birrell */ 17086ff6d951SJohn Birrell if (eprobes && pgp->dp_dofversion < DOF_VERSION_2) 17096ff6d951SJohn Birrell pgp->dp_dofversion = DOF_VERSION_2; 17106ff6d951SJohn Birrell 17116ff6d951SJohn Birrell if ((dof = dtrace_dof_create(dtp, pgp, dflags)) == NULL) 17126ff6d951SJohn Birrell return (-1); /* errno is set for us */ 17136ff6d951SJohn Birrell 171433d84250SMark Johnston snprintf(tfile, sizeof(tfile), "%s.XXXXXX", file); 1715ed09cc1bSMark Johnston if ((fd = mkostemp(tfile, O_CLOEXEC)) == -1) 17162693feb4SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 171733d84250SMark Johnston "failed to create temporary file %s: %s", 171833d84250SMark Johnston tfile, strerror(errno))); 17196ff6d951SJohn Birrell 17206ff6d951SJohn Birrell /* 17216ff6d951SJohn Birrell * If -xlinktype=DOF has been selected, just write out the DOF. 17226ff6d951SJohn Birrell * Otherwise proceed to the default of generating and linking ELF. 17236ff6d951SJohn Birrell */ 17246ff6d951SJohn Birrell switch (dtp->dt_linktype) { 17256ff6d951SJohn Birrell case DT_LTYP_DOF: 17266ff6d951SJohn Birrell if (dt_write(dtp, fd, dof, dof->dofh_filesz) < dof->dofh_filesz) 17276ff6d951SJohn Birrell ret = errno; 17286ff6d951SJohn Birrell 17296ff6d951SJohn Birrell if (close(fd) != 0 && ret == 0) 17306ff6d951SJohn Birrell ret = errno; 17316ff6d951SJohn Birrell 17326ff6d951SJohn Birrell if (ret != 0) { 17336ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 17346ff6d951SJohn Birrell "failed to write %s: %s", file, strerror(ret))); 17356ff6d951SJohn Birrell } 17366ff6d951SJohn Birrell 17376ff6d951SJohn Birrell return (0); 17386ff6d951SJohn Birrell 17396ff6d951SJohn Birrell case DT_LTYP_ELF: 17406ff6d951SJohn Birrell break; /* fall through to the rest of dtrace_program_link() */ 17416ff6d951SJohn Birrell 17426ff6d951SJohn Birrell default: 17436ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 17446ff6d951SJohn Birrell "invalid link type %u\n", dtp->dt_linktype)); 17456ff6d951SJohn Birrell } 17466ff6d951SJohn Birrell 17476ff6d951SJohn Birrell 17486ff6d951SJohn Birrell if (dtp->dt_oflags & DTRACE_O_LP64) 17496ff6d951SJohn Birrell status = dump_elf64(dtp, dof, fd); 17506ff6d951SJohn Birrell else 17516ff6d951SJohn Birrell status = dump_elf32(dtp, dof, fd); 17526ff6d951SJohn Birrell 17538caf8a8dSMark Johnston if (status != 0) 175433d84250SMark Johnston return (dt_link_error(dtp, NULL, -1, NULL, 17558caf8a8dSMark Johnston "failed to write %s: %s", tfile, 17568caf8a8dSMark Johnston strerror(dtrace_errno(dtp)))); 17576ff6d951SJohn Birrell 17586ff6d951SJohn Birrell if (!dtp->dt_lazyload) { 17598caf8a8dSMark Johnston const char *fmt = "%s -o %s -r %s %s"; 17600fff3baaSMark Johnston dt_dirpath_t *dp = dt_list_next(&dtp->dt_lib_path); 17612693feb4SJohn Birrell 17620fff3baaSMark Johnston (void) snprintf(drti, sizeof (drti), "%s/drti.o", dp->dir_path); 17632693feb4SJohn Birrell 17642693feb4SJohn Birrell len = snprintf(&tmp, 1, fmt, dtp->dt_ld_path, file, tfile, 17652693feb4SJohn Birrell drti) + 1; 17662693feb4SJohn Birrell 17672693feb4SJohn Birrell cmd = alloca(len); 17682693feb4SJohn Birrell 17698caf8a8dSMark Johnston (void) snprintf(cmd, len, fmt, dtp->dt_ld_path, file, tfile, 17700f2bd1e8SRui Paulo drti); 17716ff6d951SJohn Birrell if ((status = system(cmd)) == -1) { 177203a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 17736ff6d951SJohn Birrell "failed to run %s: %s", dtp->dt_ld_path, 17746ff6d951SJohn Birrell strerror(errno)); 17756ff6d951SJohn Birrell goto done; 17766ff6d951SJohn Birrell } 17776ff6d951SJohn Birrell 17786ff6d951SJohn Birrell if (WIFSIGNALED(status)) { 177903a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 17806ff6d951SJohn Birrell "failed to link %s: %s failed due to signal %d", 17816ff6d951SJohn Birrell file, dtp->dt_ld_path, WTERMSIG(status)); 17826ff6d951SJohn Birrell goto done; 17836ff6d951SJohn Birrell } 17846ff6d951SJohn Birrell 17856ff6d951SJohn Birrell if (WEXITSTATUS(status) != 0) { 178603a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 17876ff6d951SJohn Birrell "failed to link %s: %s exited with status %d\n", 17886ff6d951SJohn Birrell file, dtp->dt_ld_path, WEXITSTATUS(status)); 17896ff6d951SJohn Birrell goto done; 17906ff6d951SJohn Birrell } 17910f2bd1e8SRui Paulo (void) close(fd); /* release temporary file */ 179203a5f9f0SMark Johnston 179303a5f9f0SMark Johnston /* 179403a5f9f0SMark Johnston * Now that we've linked drti.o, reduce the global __SUNW_dof 179503a5f9f0SMark Johnston * symbol to a local symbol. This is needed to so that multiple 179603a5f9f0SMark Johnston * generated object files (for different providers, for 179703a5f9f0SMark Johnston * instance) can be linked together. This is accomplished using 179803a5f9f0SMark Johnston * the -Blocal flag with Sun's linker, but GNU ld doesn't appear 179903a5f9f0SMark Johnston * to have an equivalent option. 180003a5f9f0SMark Johnston */ 180103a5f9f0SMark Johnston asprintf(&cmd, "%s --localize-hidden %s", dtp->dt_objcopy_path, 180203a5f9f0SMark Johnston file); 180303a5f9f0SMark Johnston if ((status = system(cmd)) == -1) { 180403a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, -1, NULL, 180503a5f9f0SMark Johnston "failed to run %s: %s", dtp->dt_objcopy_path, 180603a5f9f0SMark Johnston strerror(errno)); 180703a5f9f0SMark Johnston free(cmd); 180803a5f9f0SMark Johnston goto done; 180903a5f9f0SMark Johnston } 181003a5f9f0SMark Johnston free(cmd); 181103a5f9f0SMark Johnston 181203a5f9f0SMark Johnston if (WIFSIGNALED(status)) { 181303a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, -1, NULL, 181403a5f9f0SMark Johnston "failed to link %s: %s failed due to signal %d", 181503a5f9f0SMark Johnston file, dtp->dt_objcopy_path, WTERMSIG(status)); 181603a5f9f0SMark Johnston goto done; 181703a5f9f0SMark Johnston } 181803a5f9f0SMark Johnston 181903a5f9f0SMark Johnston if (WEXITSTATUS(status) != 0) { 182003a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, -1, NULL, 182103a5f9f0SMark Johnston "failed to link %s: %s exited with status %d\n", 182203a5f9f0SMark Johnston file, dtp->dt_objcopy_path, WEXITSTATUS(status)); 182303a5f9f0SMark Johnston goto done; 182403a5f9f0SMark Johnston } 18256ff6d951SJohn Birrell } else { 1826ed09cc1bSMark Johnston if (rename(tfile, file) != 0) { 1827ed09cc1bSMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 1828ed09cc1bSMark Johnston "failed to rename %s to %s: %s", tfile, file, 1829ed09cc1bSMark Johnston strerror(errno)); 1830ed09cc1bSMark Johnston goto done; 1831ed09cc1bSMark Johnston } 18326ff6d951SJohn Birrell (void) close(fd); 18336ff6d951SJohn Birrell } 18346ff6d951SJohn Birrell 18356ff6d951SJohn Birrell done: 18366ff6d951SJohn Birrell dtrace_dof_destroy(dtp, dof); 18372693feb4SJohn Birrell 1838ed09cc1bSMark Johnston if (!dtp->dt_lazyload) 1839ed09cc1bSMark Johnston (void) unlink(tfile); 18406ff6d951SJohn Birrell return (ret); 18416ff6d951SJohn Birrell } 1842