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. 256ff6d951SJohn Birrell */ 266ff6d951SJohn Birrell 276ff6d951SJohn Birrell #pragma ident "%Z%%M% %I% %E% SMI" 286ff6d951SJohn Birrell 296ff6d951SJohn Birrell #define ELF_TARGET_ALL 306ff6d951SJohn Birrell #include <elf.h> 316ff6d951SJohn Birrell 326ff6d951SJohn Birrell #include <sys/types.h> 33bc96366cSSteven Hartland #ifdef illumos 346ff6d951SJohn Birrell #include <sys/sysmacros.h> 352693feb4SJohn Birrell #else 362693feb4SJohn Birrell #define P2ROUNDUP(x, align) (-(-(x) & -(align))) 372693feb4SJohn Birrell #endif 386ff6d951SJohn Birrell 396ff6d951SJohn Birrell #include <unistd.h> 406ff6d951SJohn Birrell #include <strings.h> 41bc96366cSSteven Hartland #ifdef illumos 426ff6d951SJohn Birrell #include <alloca.h> 432693feb4SJohn Birrell #endif 446ff6d951SJohn Birrell #include <limits.h> 456ff6d951SJohn Birrell #include <stddef.h> 466ff6d951SJohn Birrell #include <stdlib.h> 476ff6d951SJohn Birrell #include <stdio.h> 486ff6d951SJohn Birrell #include <fcntl.h> 496ff6d951SJohn Birrell #include <errno.h> 50bc96366cSSteven Hartland #ifdef illumos 516ff6d951SJohn Birrell #include <wait.h> 522693feb4SJohn Birrell #else 532693feb4SJohn Birrell #include <sys/wait.h> 540f2bd1e8SRui Paulo #include <libelf.h> 550f2bd1e8SRui Paulo #include <gelf.h> 560f2bd1e8SRui Paulo #include <sys/mman.h> 572693feb4SJohn Birrell #endif 586ff6d951SJohn Birrell #include <assert.h> 596ff6d951SJohn Birrell #include <sys/ipc.h> 606ff6d951SJohn Birrell 616ff6d951SJohn Birrell #include <dt_impl.h> 626ff6d951SJohn Birrell #include <dt_provider.h> 636ff6d951SJohn Birrell #include <dt_program.h> 646ff6d951SJohn Birrell #include <dt_string.h> 656ff6d951SJohn Birrell 666ff6d951SJohn Birrell #define ESHDR_NULL 0 676ff6d951SJohn Birrell #define ESHDR_SHSTRTAB 1 686ff6d951SJohn Birrell #define ESHDR_DOF 2 696ff6d951SJohn Birrell #define ESHDR_STRTAB 3 706ff6d951SJohn Birrell #define ESHDR_SYMTAB 4 716ff6d951SJohn Birrell #define ESHDR_REL 5 726ff6d951SJohn Birrell #define ESHDR_NUM 6 736ff6d951SJohn Birrell 746ff6d951SJohn Birrell #define PWRITE_SCN(index, data) \ 756ff6d951SJohn Birrell (lseek64(fd, (off64_t)elf_file.shdr[(index)].sh_offset, SEEK_SET) != \ 766ff6d951SJohn Birrell (off64_t)elf_file.shdr[(index)].sh_offset || \ 776ff6d951SJohn Birrell dt_write(dtp, fd, (data), elf_file.shdr[(index)].sh_size) != \ 786ff6d951SJohn Birrell elf_file.shdr[(index)].sh_size) 796ff6d951SJohn Birrell 806ff6d951SJohn Birrell static const char DTRACE_SHSTRTAB32[] = "\0" 816ff6d951SJohn Birrell ".shstrtab\0" /* 1 */ 826ff6d951SJohn Birrell ".SUNW_dof\0" /* 11 */ 836ff6d951SJohn Birrell ".strtab\0" /* 21 */ 846ff6d951SJohn Birrell ".symtab\0" /* 29 */ 856ff6d951SJohn Birrell #ifdef __sparc 866ff6d951SJohn Birrell ".rela.SUNW_dof"; /* 37 */ 876ff6d951SJohn Birrell #else 886ff6d951SJohn Birrell ".rel.SUNW_dof"; /* 37 */ 896ff6d951SJohn Birrell #endif 906ff6d951SJohn Birrell 916ff6d951SJohn Birrell static const char DTRACE_SHSTRTAB64[] = "\0" 926ff6d951SJohn Birrell ".shstrtab\0" /* 1 */ 936ff6d951SJohn Birrell ".SUNW_dof\0" /* 11 */ 946ff6d951SJohn Birrell ".strtab\0" /* 21 */ 956ff6d951SJohn Birrell ".symtab\0" /* 29 */ 966ff6d951SJohn Birrell ".rela.SUNW_dof"; /* 37 */ 976ff6d951SJohn Birrell 986ff6d951SJohn Birrell static const char DOFSTR[] = "__SUNW_dof"; 996ff6d951SJohn Birrell static const char DOFLAZYSTR[] = "___SUNW_dof"; 1006ff6d951SJohn Birrell 1016ff6d951SJohn Birrell typedef struct dt_link_pair { 1026ff6d951SJohn Birrell struct dt_link_pair *dlp_next; /* next pair in linked list */ 1036ff6d951SJohn Birrell void *dlp_str; /* buffer for string table */ 1046ff6d951SJohn Birrell void *dlp_sym; /* buffer for symbol table */ 1056ff6d951SJohn Birrell } dt_link_pair_t; 1066ff6d951SJohn Birrell 1076ff6d951SJohn Birrell typedef struct dof_elf32 { 1086ff6d951SJohn Birrell uint32_t de_nrel; /* relocation count */ 1096ff6d951SJohn Birrell #ifdef __sparc 1106ff6d951SJohn Birrell Elf32_Rela *de_rel; /* array of relocations for sparc */ 1116ff6d951SJohn Birrell #else 1126ff6d951SJohn Birrell Elf32_Rel *de_rel; /* array of relocations for x86 */ 1136ff6d951SJohn Birrell #endif 1146ff6d951SJohn Birrell uint32_t de_nsym; /* symbol count */ 1156ff6d951SJohn Birrell Elf32_Sym *de_sym; /* array of symbols */ 1166ff6d951SJohn Birrell uint32_t de_strlen; /* size of of string table */ 1176ff6d951SJohn Birrell char *de_strtab; /* string table */ 1186ff6d951SJohn Birrell uint32_t de_global; /* index of the first global symbol */ 1196ff6d951SJohn Birrell } dof_elf32_t; 1206ff6d951SJohn Birrell 1216ff6d951SJohn Birrell static int 1226ff6d951SJohn Birrell prepare_elf32(dtrace_hdl_t *dtp, const dof_hdr_t *dof, dof_elf32_t *dep) 1236ff6d951SJohn Birrell { 1246ff6d951SJohn Birrell dof_sec_t *dofs, *s; 1256ff6d951SJohn Birrell dof_relohdr_t *dofrh; 1266ff6d951SJohn Birrell dof_relodesc_t *dofr; 1276ff6d951SJohn Birrell char *strtab; 1286ff6d951SJohn Birrell int i, j, nrel; 1296ff6d951SJohn Birrell size_t strtabsz = 1; 1306ff6d951SJohn Birrell uint32_t count = 0; 1316ff6d951SJohn Birrell size_t base; 1326ff6d951SJohn Birrell Elf32_Sym *sym; 1336ff6d951SJohn Birrell #ifdef __sparc 1346ff6d951SJohn Birrell Elf32_Rela *rel; 1356ff6d951SJohn Birrell #else 1366ff6d951SJohn Birrell Elf32_Rel *rel; 1376ff6d951SJohn Birrell #endif 1386ff6d951SJohn Birrell 1396ff6d951SJohn Birrell /*LINTED*/ 1406ff6d951SJohn Birrell dofs = (dof_sec_t *)((char *)dof + dof->dofh_secoff); 1416ff6d951SJohn Birrell 1426ff6d951SJohn Birrell /* 1436ff6d951SJohn Birrell * First compute the size of the string table and the number of 1446ff6d951SJohn Birrell * relocations present in the DOF. 1456ff6d951SJohn Birrell */ 1466ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 1476ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 1486ff6d951SJohn Birrell continue; 1496ff6d951SJohn Birrell 1506ff6d951SJohn Birrell /*LINTED*/ 1516ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 1526ff6d951SJohn Birrell 1536ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 1546ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 1556ff6d951SJohn Birrell assert(strtab[0] == '\0'); 1566ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 1576ff6d951SJohn Birrell 1586ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 1596ff6d951SJohn Birrell /*LINTED*/ 1606ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 1616ff6d951SJohn Birrell count += s->dofs_size / s->dofs_entsize; 1626ff6d951SJohn Birrell } 1636ff6d951SJohn Birrell 1646ff6d951SJohn Birrell dep->de_strlen = strtabsz; 1656ff6d951SJohn Birrell dep->de_nrel = count; 1666ff6d951SJohn Birrell dep->de_nsym = count + 1; /* the first symbol is always null */ 1676ff6d951SJohn Birrell 1686ff6d951SJohn Birrell if (dtp->dt_lazyload) { 1696ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFLAZYSTR); 1706ff6d951SJohn Birrell dep->de_nsym++; 1716ff6d951SJohn Birrell } else { 1726ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFSTR); 1736ff6d951SJohn Birrell dep->de_nsym++; 1746ff6d951SJohn Birrell } 1756ff6d951SJohn Birrell 1766ff6d951SJohn Birrell if ((dep->de_rel = calloc(dep->de_nrel, 1776ff6d951SJohn Birrell sizeof (dep->de_rel[0]))) == NULL) { 1786ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 1796ff6d951SJohn Birrell } 1806ff6d951SJohn Birrell 1816ff6d951SJohn Birrell if ((dep->de_sym = calloc(dep->de_nsym, sizeof (Elf32_Sym))) == NULL) { 1826ff6d951SJohn Birrell free(dep->de_rel); 1836ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 1846ff6d951SJohn Birrell } 1856ff6d951SJohn Birrell 1866ff6d951SJohn Birrell if ((dep->de_strtab = calloc(dep->de_strlen, 1)) == NULL) { 1876ff6d951SJohn Birrell free(dep->de_rel); 1886ff6d951SJohn Birrell free(dep->de_sym); 1896ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 1906ff6d951SJohn Birrell } 1916ff6d951SJohn Birrell 1926ff6d951SJohn Birrell count = 0; 1936ff6d951SJohn Birrell strtabsz = 1; 1946ff6d951SJohn Birrell dep->de_strtab[0] = '\0'; 1956ff6d951SJohn Birrell rel = dep->de_rel; 1966ff6d951SJohn Birrell sym = dep->de_sym; 1976ff6d951SJohn Birrell dep->de_global = 1; 1986ff6d951SJohn Birrell 1996ff6d951SJohn Birrell /* 2006ff6d951SJohn Birrell * The first symbol table entry must be zeroed and is always ignored. 2016ff6d951SJohn Birrell */ 2026ff6d951SJohn Birrell bzero(sym, sizeof (Elf32_Sym)); 2036ff6d951SJohn Birrell sym++; 2046ff6d951SJohn Birrell 2056ff6d951SJohn Birrell /* 2066ff6d951SJohn Birrell * Take a second pass through the DOF sections filling in the 2076ff6d951SJohn Birrell * memory we allocated. 2086ff6d951SJohn Birrell */ 2096ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 2106ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 2116ff6d951SJohn Birrell continue; 2126ff6d951SJohn Birrell 2136ff6d951SJohn Birrell /*LINTED*/ 2146ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 2156ff6d951SJohn Birrell 2166ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 2176ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 2186ff6d951SJohn Birrell bcopy(strtab + 1, dep->de_strtab + strtabsz, s->dofs_size); 2196ff6d951SJohn Birrell base = strtabsz; 2206ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 2216ff6d951SJohn Birrell 2226ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 2236ff6d951SJohn Birrell /*LINTED*/ 2246ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 2256ff6d951SJohn Birrell nrel = s->dofs_size / s->dofs_entsize; 2266ff6d951SJohn Birrell 2276ff6d951SJohn Birrell s = &dofs[dofrh->dofr_tgtsec]; 2286ff6d951SJohn Birrell 2296ff6d951SJohn Birrell for (j = 0; j < nrel; j++) { 230b78ee15eSRuslan Bukin #if defined(__aarch64__) 231b78ee15eSRuslan Bukin /* XXX */ 232b78ee15eSRuslan Bukin printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 233b78ee15eSRuslan Bukin #elif defined(__arm__) 2342693feb4SJohn Birrell /* XXX */ 2352693feb4SJohn Birrell printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 2362693feb4SJohn Birrell #elif defined(__i386) || defined(__amd64) 2376ff6d951SJohn Birrell rel->r_offset = s->dofs_offset + 2386ff6d951SJohn Birrell dofr[j].dofr_offset; 2396ff6d951SJohn Birrell rel->r_info = ELF32_R_INFO(count + dep->de_global, 2406ff6d951SJohn Birrell R_386_32); 2412693feb4SJohn Birrell #elif defined(__mips__) 2422693feb4SJohn Birrell /* XXX */ 2432693feb4SJohn Birrell printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 2442693feb4SJohn Birrell #elif defined(__powerpc__) 24530b318b9SJustin Hibbits /* 24630b318b9SJustin Hibbits * Add 4 bytes to hit the low half of this 64-bit 24730b318b9SJustin Hibbits * big-endian address. 24830b318b9SJustin Hibbits */ 24930b318b9SJustin Hibbits rel->r_offset = s->dofs_offset + 25030b318b9SJustin Hibbits dofr[j].dofr_offset + 4; 25130b318b9SJustin Hibbits rel->r_info = ELF32_R_INFO(count + dep->de_global, 25230b318b9SJustin Hibbits R_PPC_REL32); 253fed1ca4bSRuslan Bukin #elif defined(__riscv__) 254fed1ca4bSRuslan Bukin /* XXX */ 255fed1ca4bSRuslan Bukin printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 2566ff6d951SJohn Birrell #elif defined(__sparc) 2576ff6d951SJohn Birrell /* 2586ff6d951SJohn Birrell * Add 4 bytes to hit the low half of this 64-bit 2596ff6d951SJohn Birrell * big-endian address. 2606ff6d951SJohn Birrell */ 2616ff6d951SJohn Birrell rel->r_offset = s->dofs_offset + 2626ff6d951SJohn Birrell dofr[j].dofr_offset + 4; 2636ff6d951SJohn Birrell rel->r_info = ELF32_R_INFO(count + dep->de_global, 2646ff6d951SJohn Birrell R_SPARC_32); 2656ff6d951SJohn Birrell #else 2666ff6d951SJohn Birrell #error unknown ISA 2676ff6d951SJohn Birrell #endif 2686ff6d951SJohn Birrell 2696ff6d951SJohn Birrell sym->st_name = base + dofr[j].dofr_name - 1; 2706ff6d951SJohn Birrell sym->st_value = 0; 2716ff6d951SJohn Birrell sym->st_size = 0; 2726ff6d951SJohn Birrell sym->st_info = ELF32_ST_INFO(STB_GLOBAL, STT_FUNC); 2736ff6d951SJohn Birrell sym->st_other = 0; 2746ff6d951SJohn Birrell sym->st_shndx = SHN_UNDEF; 2756ff6d951SJohn Birrell 2766ff6d951SJohn Birrell rel++; 2776ff6d951SJohn Birrell sym++; 2786ff6d951SJohn Birrell count++; 2796ff6d951SJohn Birrell } 2806ff6d951SJohn Birrell } 2816ff6d951SJohn Birrell 2826ff6d951SJohn Birrell /* 2836ff6d951SJohn Birrell * Add a symbol for the DOF itself. We use a different symbol for 2846ff6d951SJohn Birrell * lazily and actively loaded DOF to make them easy to distinguish. 2856ff6d951SJohn Birrell */ 2866ff6d951SJohn Birrell sym->st_name = strtabsz; 2876ff6d951SJohn Birrell sym->st_value = 0; 2886ff6d951SJohn Birrell sym->st_size = dof->dofh_filesz; 2896ff6d951SJohn Birrell sym->st_info = ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT); 29003a5f9f0SMark Johnston #ifdef illumos 2916ff6d951SJohn Birrell sym->st_other = 0; 29203a5f9f0SMark Johnston #else 29303a5f9f0SMark Johnston sym->st_other = ELF32_ST_VISIBILITY(STV_HIDDEN); 29403a5f9f0SMark Johnston #endif 2956ff6d951SJohn Birrell sym->st_shndx = ESHDR_DOF; 2966ff6d951SJohn Birrell sym++; 2976ff6d951SJohn Birrell 2986ff6d951SJohn Birrell if (dtp->dt_lazyload) { 2996ff6d951SJohn Birrell bcopy(DOFLAZYSTR, dep->de_strtab + strtabsz, 3006ff6d951SJohn Birrell sizeof (DOFLAZYSTR)); 3016ff6d951SJohn Birrell strtabsz += sizeof (DOFLAZYSTR); 3026ff6d951SJohn Birrell } else { 3036ff6d951SJohn Birrell bcopy(DOFSTR, dep->de_strtab + strtabsz, sizeof (DOFSTR)); 3046ff6d951SJohn Birrell strtabsz += sizeof (DOFSTR); 3056ff6d951SJohn Birrell } 3066ff6d951SJohn Birrell 3076ff6d951SJohn Birrell assert(count == dep->de_nrel); 3086ff6d951SJohn Birrell assert(strtabsz == dep->de_strlen); 3096ff6d951SJohn Birrell 3106ff6d951SJohn Birrell return (0); 3116ff6d951SJohn Birrell } 3126ff6d951SJohn Birrell 3136ff6d951SJohn Birrell 3146ff6d951SJohn Birrell typedef struct dof_elf64 { 3156ff6d951SJohn Birrell uint32_t de_nrel; 3166ff6d951SJohn Birrell Elf64_Rela *de_rel; 3176ff6d951SJohn Birrell uint32_t de_nsym; 3186ff6d951SJohn Birrell Elf64_Sym *de_sym; 3196ff6d951SJohn Birrell 3206ff6d951SJohn Birrell uint32_t de_strlen; 3216ff6d951SJohn Birrell char *de_strtab; 3226ff6d951SJohn Birrell 3236ff6d951SJohn Birrell uint32_t de_global; 3246ff6d951SJohn Birrell } dof_elf64_t; 3256ff6d951SJohn Birrell 3266ff6d951SJohn Birrell static int 3276ff6d951SJohn Birrell prepare_elf64(dtrace_hdl_t *dtp, const dof_hdr_t *dof, dof_elf64_t *dep) 3286ff6d951SJohn Birrell { 3296ff6d951SJohn Birrell dof_sec_t *dofs, *s; 3306ff6d951SJohn Birrell dof_relohdr_t *dofrh; 3316ff6d951SJohn Birrell dof_relodesc_t *dofr; 3326ff6d951SJohn Birrell char *strtab; 3336ff6d951SJohn Birrell int i, j, nrel; 3346ff6d951SJohn Birrell size_t strtabsz = 1; 335bc96366cSSteven Hartland #ifdef illumos 3366ff6d951SJohn Birrell uint32_t count = 0; 3378caf8a8dSMark Johnston #else 3388caf8a8dSMark Johnston uint64_t count = 0; 3398caf8a8dSMark Johnston #endif 3406ff6d951SJohn Birrell size_t base; 3416ff6d951SJohn Birrell Elf64_Sym *sym; 3426ff6d951SJohn Birrell Elf64_Rela *rel; 3436ff6d951SJohn Birrell 3446ff6d951SJohn Birrell /*LINTED*/ 3456ff6d951SJohn Birrell dofs = (dof_sec_t *)((char *)dof + dof->dofh_secoff); 3466ff6d951SJohn Birrell 3476ff6d951SJohn Birrell /* 3486ff6d951SJohn Birrell * First compute the size of the string table and the number of 3496ff6d951SJohn Birrell * relocations present in the DOF. 3506ff6d951SJohn Birrell */ 3516ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 3526ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 3536ff6d951SJohn Birrell continue; 3546ff6d951SJohn Birrell 3556ff6d951SJohn Birrell /*LINTED*/ 3566ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 3576ff6d951SJohn Birrell 3586ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 3596ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 3606ff6d951SJohn Birrell assert(strtab[0] == '\0'); 3616ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 3626ff6d951SJohn Birrell 3636ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 3646ff6d951SJohn Birrell /*LINTED*/ 3656ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 3666ff6d951SJohn Birrell count += s->dofs_size / s->dofs_entsize; 3676ff6d951SJohn Birrell } 3686ff6d951SJohn Birrell 3696ff6d951SJohn Birrell dep->de_strlen = strtabsz; 3706ff6d951SJohn Birrell dep->de_nrel = count; 3716ff6d951SJohn Birrell dep->de_nsym = count + 1; /* the first symbol is always null */ 3726ff6d951SJohn Birrell 3736ff6d951SJohn Birrell if (dtp->dt_lazyload) { 3746ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFLAZYSTR); 3756ff6d951SJohn Birrell dep->de_nsym++; 3766ff6d951SJohn Birrell } else { 3776ff6d951SJohn Birrell dep->de_strlen += sizeof (DOFSTR); 3786ff6d951SJohn Birrell dep->de_nsym++; 3796ff6d951SJohn Birrell } 3806ff6d951SJohn Birrell 3816ff6d951SJohn Birrell if ((dep->de_rel = calloc(dep->de_nrel, 3826ff6d951SJohn Birrell sizeof (dep->de_rel[0]))) == NULL) { 3836ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 3846ff6d951SJohn Birrell } 3856ff6d951SJohn Birrell 3866ff6d951SJohn Birrell if ((dep->de_sym = calloc(dep->de_nsym, sizeof (Elf64_Sym))) == NULL) { 3876ff6d951SJohn Birrell free(dep->de_rel); 3886ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 3896ff6d951SJohn Birrell } 3906ff6d951SJohn Birrell 3916ff6d951SJohn Birrell if ((dep->de_strtab = calloc(dep->de_strlen, 1)) == NULL) { 3926ff6d951SJohn Birrell free(dep->de_rel); 3936ff6d951SJohn Birrell free(dep->de_sym); 3946ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_NOMEM)); 3956ff6d951SJohn Birrell } 3966ff6d951SJohn Birrell 3976ff6d951SJohn Birrell count = 0; 3986ff6d951SJohn Birrell strtabsz = 1; 3996ff6d951SJohn Birrell dep->de_strtab[0] = '\0'; 4006ff6d951SJohn Birrell rel = dep->de_rel; 4016ff6d951SJohn Birrell sym = dep->de_sym; 4026ff6d951SJohn Birrell dep->de_global = 1; 4036ff6d951SJohn Birrell 4046ff6d951SJohn Birrell /* 4056ff6d951SJohn Birrell * The first symbol table entry must be zeroed and is always ignored. 4066ff6d951SJohn Birrell */ 4076ff6d951SJohn Birrell bzero(sym, sizeof (Elf64_Sym)); 4086ff6d951SJohn Birrell sym++; 4096ff6d951SJohn Birrell 4106ff6d951SJohn Birrell /* 4116ff6d951SJohn Birrell * Take a second pass through the DOF sections filling in the 4126ff6d951SJohn Birrell * memory we allocated. 4136ff6d951SJohn Birrell */ 4146ff6d951SJohn Birrell for (i = 0; i < dof->dofh_secnum; i++) { 4156ff6d951SJohn Birrell if (dofs[i].dofs_type != DOF_SECT_URELHDR) 4166ff6d951SJohn Birrell continue; 4176ff6d951SJohn Birrell 4186ff6d951SJohn Birrell /*LINTED*/ 4196ff6d951SJohn Birrell dofrh = (dof_relohdr_t *)((char *)dof + dofs[i].dofs_offset); 4206ff6d951SJohn Birrell 4216ff6d951SJohn Birrell s = &dofs[dofrh->dofr_strtab]; 4226ff6d951SJohn Birrell strtab = (char *)dof + s->dofs_offset; 4236ff6d951SJohn Birrell bcopy(strtab + 1, dep->de_strtab + strtabsz, s->dofs_size); 4246ff6d951SJohn Birrell base = strtabsz; 4256ff6d951SJohn Birrell strtabsz += s->dofs_size - 1; 4266ff6d951SJohn Birrell 4276ff6d951SJohn Birrell s = &dofs[dofrh->dofr_relsec]; 4286ff6d951SJohn Birrell /*LINTED*/ 4296ff6d951SJohn Birrell dofr = (dof_relodesc_t *)((char *)dof + s->dofs_offset); 4306ff6d951SJohn Birrell nrel = s->dofs_size / s->dofs_entsize; 4316ff6d951SJohn Birrell 4326ff6d951SJohn Birrell s = &dofs[dofrh->dofr_tgtsec]; 4336ff6d951SJohn Birrell 4346ff6d951SJohn Birrell for (j = 0; j < nrel; j++) { 435b78ee15eSRuslan Bukin #if defined(__aarch64__) 436b78ee15eSRuslan Bukin /* XXX */ 437b78ee15eSRuslan Bukin #elif defined(__arm__) 4382693feb4SJohn Birrell /* XXX */ 4392693feb4SJohn Birrell #elif defined(__mips__) 4402693feb4SJohn Birrell /* XXX */ 4412693feb4SJohn Birrell #elif defined(__powerpc__) 44230b318b9SJustin Hibbits rel->r_offset = s->dofs_offset + 44330b318b9SJustin Hibbits dofr[j].dofr_offset; 44430b318b9SJustin Hibbits rel->r_info = ELF64_R_INFO(count + dep->de_global, 44530b318b9SJustin Hibbits R_PPC64_REL64); 446fed1ca4bSRuslan Bukin #elif defined(__riscv__) 447fed1ca4bSRuslan Bukin /* XXX */ 4482693feb4SJohn Birrell #elif defined(__i386) || defined(__amd64) 4496ff6d951SJohn Birrell rel->r_offset = s->dofs_offset + 4506ff6d951SJohn Birrell dofr[j].dofr_offset; 451bc96366cSSteven Hartland #ifdef illumos 4526ff6d951SJohn Birrell rel->r_info = ELF64_R_INFO(count + dep->de_global, 4536ff6d951SJohn Birrell R_AMD64_64); 4548caf8a8dSMark Johnston #else 4558caf8a8dSMark Johnston rel->r_info = ELF64_R_INFO(count + dep->de_global, 4568caf8a8dSMark Johnston R_X86_64_RELATIVE); 4578caf8a8dSMark Johnston #endif 4586ff6d951SJohn Birrell #elif defined(__sparc) 4596ff6d951SJohn Birrell rel->r_offset = s->dofs_offset + 4606ff6d951SJohn Birrell dofr[j].dofr_offset; 4616ff6d951SJohn Birrell rel->r_info = ELF64_R_INFO(count + dep->de_global, 4626ff6d951SJohn Birrell R_SPARC_64); 4636ff6d951SJohn Birrell #else 4646ff6d951SJohn Birrell #error unknown ISA 4656ff6d951SJohn Birrell #endif 4666ff6d951SJohn Birrell 4676ff6d951SJohn Birrell sym->st_name = base + dofr[j].dofr_name - 1; 4686ff6d951SJohn Birrell sym->st_value = 0; 4696ff6d951SJohn Birrell sym->st_size = 0; 4706ff6d951SJohn Birrell sym->st_info = GELF_ST_INFO(STB_GLOBAL, STT_FUNC); 4716ff6d951SJohn Birrell sym->st_other = 0; 4726ff6d951SJohn Birrell sym->st_shndx = SHN_UNDEF; 4736ff6d951SJohn Birrell 4746ff6d951SJohn Birrell rel++; 4756ff6d951SJohn Birrell sym++; 4766ff6d951SJohn Birrell count++; 4776ff6d951SJohn Birrell } 4786ff6d951SJohn Birrell } 4796ff6d951SJohn Birrell 4806ff6d951SJohn Birrell /* 4816ff6d951SJohn Birrell * Add a symbol for the DOF itself. We use a different symbol for 4826ff6d951SJohn Birrell * lazily and actively loaded DOF to make them easy to distinguish. 4836ff6d951SJohn Birrell */ 4846ff6d951SJohn Birrell sym->st_name = strtabsz; 4856ff6d951SJohn Birrell sym->st_value = 0; 4866ff6d951SJohn Birrell sym->st_size = dof->dofh_filesz; 4876ff6d951SJohn Birrell sym->st_info = GELF_ST_INFO(STB_GLOBAL, STT_OBJECT); 48803a5f9f0SMark Johnston #ifdef illumos 4896ff6d951SJohn Birrell sym->st_other = 0; 49003a5f9f0SMark Johnston #else 49103a5f9f0SMark Johnston sym->st_other = ELF64_ST_VISIBILITY(STV_HIDDEN); 49203a5f9f0SMark Johnston #endif 4936ff6d951SJohn Birrell sym->st_shndx = ESHDR_DOF; 4946ff6d951SJohn Birrell sym++; 4956ff6d951SJohn Birrell 4966ff6d951SJohn Birrell if (dtp->dt_lazyload) { 4976ff6d951SJohn Birrell bcopy(DOFLAZYSTR, dep->de_strtab + strtabsz, 4986ff6d951SJohn Birrell sizeof (DOFLAZYSTR)); 4996ff6d951SJohn Birrell strtabsz += sizeof (DOFLAZYSTR); 5006ff6d951SJohn Birrell } else { 5016ff6d951SJohn Birrell bcopy(DOFSTR, dep->de_strtab + strtabsz, sizeof (DOFSTR)); 5026ff6d951SJohn Birrell strtabsz += sizeof (DOFSTR); 5036ff6d951SJohn Birrell } 5046ff6d951SJohn Birrell 5056ff6d951SJohn Birrell assert(count == dep->de_nrel); 5066ff6d951SJohn Birrell assert(strtabsz == dep->de_strlen); 5076ff6d951SJohn Birrell 5086ff6d951SJohn Birrell return (0); 5096ff6d951SJohn Birrell } 5106ff6d951SJohn Birrell 5116ff6d951SJohn Birrell /* 5126ff6d951SJohn Birrell * Write out an ELF32 file prologue consisting of a header, section headers, 5136ff6d951SJohn Birrell * and a section header string table. The DOF data will follow this prologue 5146ff6d951SJohn Birrell * and complete the contents of the given ELF file. 5156ff6d951SJohn Birrell */ 5166ff6d951SJohn Birrell static int 5176ff6d951SJohn Birrell dump_elf32(dtrace_hdl_t *dtp, const dof_hdr_t *dof, int fd) 5186ff6d951SJohn Birrell { 5196ff6d951SJohn Birrell struct { 5206ff6d951SJohn Birrell Elf32_Ehdr ehdr; 5216ff6d951SJohn Birrell Elf32_Shdr shdr[ESHDR_NUM]; 5226ff6d951SJohn Birrell } elf_file; 5236ff6d951SJohn Birrell 5246ff6d951SJohn Birrell Elf32_Shdr *shp; 5256ff6d951SJohn Birrell Elf32_Off off; 5266ff6d951SJohn Birrell dof_elf32_t de; 5276ff6d951SJohn Birrell int ret = 0; 5286ff6d951SJohn Birrell uint_t nshdr; 5296ff6d951SJohn Birrell 5306ff6d951SJohn Birrell if (prepare_elf32(dtp, dof, &de) != 0) 5316ff6d951SJohn Birrell return (-1); /* errno is set for us */ 5326ff6d951SJohn Birrell 5336ff6d951SJohn Birrell /* 5346ff6d951SJohn Birrell * If there are no relocations, we only need enough sections for 5356ff6d951SJohn Birrell * the shstrtab and the DOF. 5366ff6d951SJohn Birrell */ 5376ff6d951SJohn Birrell nshdr = de.de_nrel == 0 ? ESHDR_SYMTAB + 1 : ESHDR_NUM; 5386ff6d951SJohn Birrell 5396ff6d951SJohn Birrell bzero(&elf_file, sizeof (elf_file)); 5406ff6d951SJohn Birrell 5416ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG0] = ELFMAG0; 5426ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG1] = ELFMAG1; 5436ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG2] = ELFMAG2; 5446ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG3] = ELFMAG3; 5456ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_VERSION] = EV_CURRENT; 5466ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_CLASS] = ELFCLASS32; 5472693feb4SJohn Birrell #if BYTE_ORDER == _BIG_ENDIAN 5486ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2MSB; 5492693feb4SJohn Birrell #else 5506ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2LSB; 5516ff6d951SJohn Birrell #endif 5522693feb4SJohn Birrell #if defined(__FreeBSD__) 5532693feb4SJohn Birrell elf_file.ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 5542693feb4SJohn Birrell #endif 5556ff6d951SJohn Birrell elf_file.ehdr.e_type = ET_REL; 5562693feb4SJohn Birrell #if defined(__arm__) 5572693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_ARM; 5582693feb4SJohn Birrell #elif defined(__mips__) 5592693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_MIPS; 5602693feb4SJohn Birrell #elif defined(__powerpc__) 5612693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_PPC; 5622693feb4SJohn Birrell #elif defined(__sparc) 5636ff6d951SJohn Birrell elf_file.ehdr.e_machine = EM_SPARC; 5646ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 5656ff6d951SJohn Birrell elf_file.ehdr.e_machine = EM_386; 5666ff6d951SJohn Birrell #endif 5676ff6d951SJohn Birrell elf_file.ehdr.e_version = EV_CURRENT; 5686ff6d951SJohn Birrell elf_file.ehdr.e_shoff = sizeof (Elf32_Ehdr); 5696ff6d951SJohn Birrell elf_file.ehdr.e_ehsize = sizeof (Elf32_Ehdr); 5706ff6d951SJohn Birrell elf_file.ehdr.e_phentsize = sizeof (Elf32_Phdr); 5716ff6d951SJohn Birrell elf_file.ehdr.e_shentsize = sizeof (Elf32_Shdr); 5726ff6d951SJohn Birrell elf_file.ehdr.e_shnum = nshdr; 5736ff6d951SJohn Birrell elf_file.ehdr.e_shstrndx = ESHDR_SHSTRTAB; 5746ff6d951SJohn Birrell off = sizeof (elf_file) + nshdr * sizeof (Elf32_Shdr); 5756ff6d951SJohn Birrell 5766ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SHSTRTAB]; 5776ff6d951SJohn Birrell shp->sh_name = 1; /* DTRACE_SHSTRTAB32[1] = ".shstrtab" */ 5786ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 5796ff6d951SJohn Birrell shp->sh_offset = off; 5806ff6d951SJohn Birrell shp->sh_size = sizeof (DTRACE_SHSTRTAB32); 5816ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 5826ff6d951SJohn Birrell off = P2ROUNDUP(shp->sh_offset + shp->sh_size, 8); 5836ff6d951SJohn Birrell 5846ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_DOF]; 5856ff6d951SJohn Birrell shp->sh_name = 11; /* DTRACE_SHSTRTAB32[11] = ".SUNW_dof" */ 5866ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 5876ff6d951SJohn Birrell shp->sh_type = SHT_SUNW_dof; 5886ff6d951SJohn Birrell shp->sh_offset = off; 5896ff6d951SJohn Birrell shp->sh_size = dof->dofh_filesz; 5906ff6d951SJohn Birrell shp->sh_addralign = 8; 5916ff6d951SJohn Birrell off = shp->sh_offset + shp->sh_size; 5926ff6d951SJohn Birrell 5936ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_STRTAB]; 5946ff6d951SJohn Birrell shp->sh_name = 21; /* DTRACE_SHSTRTAB32[21] = ".strtab" */ 5956ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 5966ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 5976ff6d951SJohn Birrell shp->sh_offset = off; 5986ff6d951SJohn Birrell shp->sh_size = de.de_strlen; 5996ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 6006ff6d951SJohn Birrell off = P2ROUNDUP(shp->sh_offset + shp->sh_size, 4); 6016ff6d951SJohn Birrell 6026ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SYMTAB]; 6036ff6d951SJohn Birrell shp->sh_name = 29; /* DTRACE_SHSTRTAB32[29] = ".symtab" */ 6046ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 6056ff6d951SJohn Birrell shp->sh_type = SHT_SYMTAB; 6066ff6d951SJohn Birrell shp->sh_entsize = sizeof (Elf32_Sym); 6076ff6d951SJohn Birrell shp->sh_link = ESHDR_STRTAB; 6086ff6d951SJohn Birrell shp->sh_offset = off; 6096ff6d951SJohn Birrell shp->sh_info = de.de_global; 6106ff6d951SJohn Birrell shp->sh_size = de.de_nsym * sizeof (Elf32_Sym); 6116ff6d951SJohn Birrell shp->sh_addralign = 4; 6126ff6d951SJohn Birrell off = P2ROUNDUP(shp->sh_offset + shp->sh_size, 4); 6136ff6d951SJohn Birrell 6146ff6d951SJohn Birrell if (de.de_nrel == 0) { 6156ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 6166ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 6176ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB32) || 6186ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 6196ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 6206ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 6216ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 6226ff6d951SJohn Birrell } 6236ff6d951SJohn Birrell } else { 6246ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_REL]; 6256ff6d951SJohn Birrell shp->sh_name = 37; /* DTRACE_SHSTRTAB32[37] = ".rel.SUNW_dof" */ 6266ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 6276ff6d951SJohn Birrell #ifdef __sparc 6286ff6d951SJohn Birrell shp->sh_type = SHT_RELA; 6296ff6d951SJohn Birrell #else 6306ff6d951SJohn Birrell shp->sh_type = SHT_REL; 6316ff6d951SJohn Birrell #endif 6326ff6d951SJohn Birrell shp->sh_entsize = sizeof (de.de_rel[0]); 6336ff6d951SJohn Birrell shp->sh_link = ESHDR_SYMTAB; 6346ff6d951SJohn Birrell shp->sh_info = ESHDR_DOF; 6356ff6d951SJohn Birrell shp->sh_offset = off; 6366ff6d951SJohn Birrell shp->sh_size = de.de_nrel * sizeof (de.de_rel[0]); 6376ff6d951SJohn Birrell shp->sh_addralign = 4; 6386ff6d951SJohn Birrell 6396ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 6406ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 6416ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB32) || 6426ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 6436ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 6446ff6d951SJohn Birrell PWRITE_SCN(ESHDR_REL, de.de_rel) || 6456ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 6466ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 6476ff6d951SJohn Birrell } 6486ff6d951SJohn Birrell } 6496ff6d951SJohn Birrell 6506ff6d951SJohn Birrell free(de.de_strtab); 6516ff6d951SJohn Birrell free(de.de_sym); 6526ff6d951SJohn Birrell free(de.de_rel); 6536ff6d951SJohn Birrell 6546ff6d951SJohn Birrell return (ret); 6556ff6d951SJohn Birrell } 6566ff6d951SJohn Birrell 6576ff6d951SJohn Birrell /* 6586ff6d951SJohn Birrell * Write out an ELF64 file prologue consisting of a header, section headers, 6596ff6d951SJohn Birrell * and a section header string table. The DOF data will follow this prologue 6606ff6d951SJohn Birrell * and complete the contents of the given ELF file. 6616ff6d951SJohn Birrell */ 6626ff6d951SJohn Birrell static int 6636ff6d951SJohn Birrell dump_elf64(dtrace_hdl_t *dtp, const dof_hdr_t *dof, int fd) 6646ff6d951SJohn Birrell { 6656ff6d951SJohn Birrell struct { 6666ff6d951SJohn Birrell Elf64_Ehdr ehdr; 6676ff6d951SJohn Birrell Elf64_Shdr shdr[ESHDR_NUM]; 6686ff6d951SJohn Birrell } elf_file; 6696ff6d951SJohn Birrell 6706ff6d951SJohn Birrell Elf64_Shdr *shp; 6716ff6d951SJohn Birrell Elf64_Off off; 6726ff6d951SJohn Birrell dof_elf64_t de; 6736ff6d951SJohn Birrell int ret = 0; 6746ff6d951SJohn Birrell uint_t nshdr; 6756ff6d951SJohn Birrell 6766ff6d951SJohn Birrell if (prepare_elf64(dtp, dof, &de) != 0) 6776ff6d951SJohn Birrell return (-1); /* errno is set for us */ 6786ff6d951SJohn Birrell 6796ff6d951SJohn Birrell /* 6806ff6d951SJohn Birrell * If there are no relocations, we only need enough sections for 6816ff6d951SJohn Birrell * the shstrtab and the DOF. 6826ff6d951SJohn Birrell */ 6836ff6d951SJohn Birrell nshdr = de.de_nrel == 0 ? ESHDR_SYMTAB + 1 : ESHDR_NUM; 6846ff6d951SJohn Birrell 6856ff6d951SJohn Birrell bzero(&elf_file, sizeof (elf_file)); 6866ff6d951SJohn Birrell 6876ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG0] = ELFMAG0; 6886ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG1] = ELFMAG1; 6896ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG2] = ELFMAG2; 6906ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_MAG3] = ELFMAG3; 6916ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_VERSION] = EV_CURRENT; 6926ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_CLASS] = ELFCLASS64; 6932693feb4SJohn Birrell #if BYTE_ORDER == _BIG_ENDIAN 6946ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2MSB; 6952693feb4SJohn Birrell #else 6966ff6d951SJohn Birrell elf_file.ehdr.e_ident[EI_DATA] = ELFDATA2LSB; 6976ff6d951SJohn Birrell #endif 6982693feb4SJohn Birrell #if defined(__FreeBSD__) 6992693feb4SJohn Birrell elf_file.ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 7002693feb4SJohn Birrell #endif 7016ff6d951SJohn Birrell elf_file.ehdr.e_type = ET_REL; 7022693feb4SJohn Birrell #if defined(__arm__) 7032693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_ARM; 7042693feb4SJohn Birrell #elif defined(__mips__) 7052693feb4SJohn Birrell elf_file.ehdr.e_machine = EM_MIPS; 706b08e2b04SJustin Hibbits #elif defined(__powerpc64__) 707b08e2b04SJustin Hibbits elf_file.ehdr.e_machine = EM_PPC64; 7082693feb4SJohn Birrell #elif defined(__sparc) 7096ff6d951SJohn Birrell elf_file.ehdr.e_machine = EM_SPARCV9; 7106ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 7116ff6d951SJohn Birrell elf_file.ehdr.e_machine = EM_AMD64; 7126ff6d951SJohn Birrell #endif 7136ff6d951SJohn Birrell elf_file.ehdr.e_version = EV_CURRENT; 7146ff6d951SJohn Birrell elf_file.ehdr.e_shoff = sizeof (Elf64_Ehdr); 7156ff6d951SJohn Birrell elf_file.ehdr.e_ehsize = sizeof (Elf64_Ehdr); 7166ff6d951SJohn Birrell elf_file.ehdr.e_phentsize = sizeof (Elf64_Phdr); 7176ff6d951SJohn Birrell elf_file.ehdr.e_shentsize = sizeof (Elf64_Shdr); 7186ff6d951SJohn Birrell elf_file.ehdr.e_shnum = nshdr; 7196ff6d951SJohn Birrell elf_file.ehdr.e_shstrndx = ESHDR_SHSTRTAB; 7206ff6d951SJohn Birrell off = sizeof (elf_file) + nshdr * sizeof (Elf64_Shdr); 7216ff6d951SJohn Birrell 7226ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SHSTRTAB]; 7236ff6d951SJohn Birrell shp->sh_name = 1; /* DTRACE_SHSTRTAB64[1] = ".shstrtab" */ 7246ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 7256ff6d951SJohn Birrell shp->sh_offset = off; 7266ff6d951SJohn Birrell shp->sh_size = sizeof (DTRACE_SHSTRTAB64); 7276ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 7286ff6d951SJohn Birrell off = P2ROUNDUP(shp->sh_offset + shp->sh_size, 8); 7296ff6d951SJohn Birrell 7306ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_DOF]; 7316ff6d951SJohn Birrell shp->sh_name = 11; /* DTRACE_SHSTRTAB64[11] = ".SUNW_dof" */ 7326ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 7336ff6d951SJohn Birrell shp->sh_type = SHT_SUNW_dof; 7346ff6d951SJohn Birrell shp->sh_offset = off; 7356ff6d951SJohn Birrell shp->sh_size = dof->dofh_filesz; 7366ff6d951SJohn Birrell shp->sh_addralign = 8; 7376ff6d951SJohn Birrell off = shp->sh_offset + shp->sh_size; 7386ff6d951SJohn Birrell 7396ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_STRTAB]; 7406ff6d951SJohn Birrell shp->sh_name = 21; /* DTRACE_SHSTRTAB64[21] = ".strtab" */ 7416ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 7426ff6d951SJohn Birrell shp->sh_type = SHT_STRTAB; 7436ff6d951SJohn Birrell shp->sh_offset = off; 7446ff6d951SJohn Birrell shp->sh_size = de.de_strlen; 7456ff6d951SJohn Birrell shp->sh_addralign = sizeof (char); 7466ff6d951SJohn Birrell off = P2ROUNDUP(shp->sh_offset + shp->sh_size, 8); 7476ff6d951SJohn Birrell 7486ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_SYMTAB]; 7496ff6d951SJohn Birrell shp->sh_name = 29; /* DTRACE_SHSTRTAB64[29] = ".symtab" */ 7506ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 7516ff6d951SJohn Birrell shp->sh_type = SHT_SYMTAB; 7526ff6d951SJohn Birrell shp->sh_entsize = sizeof (Elf64_Sym); 7536ff6d951SJohn Birrell shp->sh_link = ESHDR_STRTAB; 7546ff6d951SJohn Birrell shp->sh_offset = off; 7556ff6d951SJohn Birrell shp->sh_info = de.de_global; 7566ff6d951SJohn Birrell shp->sh_size = de.de_nsym * sizeof (Elf64_Sym); 7576ff6d951SJohn Birrell shp->sh_addralign = 8; 7586ff6d951SJohn Birrell off = P2ROUNDUP(shp->sh_offset + shp->sh_size, 8); 7596ff6d951SJohn Birrell 7606ff6d951SJohn Birrell if (de.de_nrel == 0) { 7616ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 7626ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 7636ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB64) || 7646ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 7656ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 7666ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 7676ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 7686ff6d951SJohn Birrell } 7696ff6d951SJohn Birrell } else { 7706ff6d951SJohn Birrell shp = &elf_file.shdr[ESHDR_REL]; 7716ff6d951SJohn Birrell shp->sh_name = 37; /* DTRACE_SHSTRTAB64[37] = ".rel.SUNW_dof" */ 7726ff6d951SJohn Birrell shp->sh_flags = SHF_ALLOC; 7736ff6d951SJohn Birrell shp->sh_type = SHT_RELA; 7746ff6d951SJohn Birrell shp->sh_entsize = sizeof (de.de_rel[0]); 7756ff6d951SJohn Birrell shp->sh_link = ESHDR_SYMTAB; 7766ff6d951SJohn Birrell shp->sh_info = ESHDR_DOF; 7776ff6d951SJohn Birrell shp->sh_offset = off; 7786ff6d951SJohn Birrell shp->sh_size = de.de_nrel * sizeof (de.de_rel[0]); 7796ff6d951SJohn Birrell shp->sh_addralign = 8; 7806ff6d951SJohn Birrell 7816ff6d951SJohn Birrell if (dt_write(dtp, fd, &elf_file, 7826ff6d951SJohn Birrell sizeof (elf_file)) != sizeof (elf_file) || 7836ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SHSTRTAB, DTRACE_SHSTRTAB64) || 7846ff6d951SJohn Birrell PWRITE_SCN(ESHDR_STRTAB, de.de_strtab) || 7856ff6d951SJohn Birrell PWRITE_SCN(ESHDR_SYMTAB, de.de_sym) || 7866ff6d951SJohn Birrell PWRITE_SCN(ESHDR_REL, de.de_rel) || 7876ff6d951SJohn Birrell PWRITE_SCN(ESHDR_DOF, dof)) { 7886ff6d951SJohn Birrell ret = dt_set_errno(dtp, errno); 7896ff6d951SJohn Birrell } 7906ff6d951SJohn Birrell } 7916ff6d951SJohn Birrell 7926ff6d951SJohn Birrell free(de.de_strtab); 7936ff6d951SJohn Birrell free(de.de_sym); 7946ff6d951SJohn Birrell free(de.de_rel); 7956ff6d951SJohn Birrell 7966ff6d951SJohn Birrell return (ret); 7976ff6d951SJohn Birrell } 7986ff6d951SJohn Birrell 7996ff6d951SJohn Birrell static int 8006ff6d951SJohn Birrell dt_symtab_lookup(Elf_Data *data_sym, int nsym, uintptr_t addr, uint_t shn, 801b08e2b04SJustin Hibbits GElf_Sym *sym, int uses_funcdesc, Elf *elf) 8026ff6d951SJohn Birrell { 8036ff6d951SJohn Birrell int i, ret = -1; 804b08e2b04SJustin Hibbits Elf64_Addr symval; 805b08e2b04SJustin Hibbits Elf_Scn *opd_scn; 806b08e2b04SJustin Hibbits Elf_Data *opd_desc; 8076ff6d951SJohn Birrell GElf_Sym s; 8086ff6d951SJohn Birrell 8096ff6d951SJohn Birrell for (i = 0; i < nsym && gelf_getsym(data_sym, i, sym) != NULL; i++) { 810b08e2b04SJustin Hibbits if (GELF_ST_TYPE(sym->st_info) == STT_FUNC) { 811b08e2b04SJustin Hibbits symval = sym->st_value; 812b08e2b04SJustin Hibbits if (uses_funcdesc) { 813b08e2b04SJustin Hibbits opd_scn = elf_getscn(elf, sym->st_shndx); 814b08e2b04SJustin Hibbits opd_desc = elf_rawdata(opd_scn, NULL); 815b08e2b04SJustin Hibbits symval = 816b08e2b04SJustin Hibbits *(uint64_t*)((char *)opd_desc->d_buf + symval); 817b08e2b04SJustin Hibbits } 818b08e2b04SJustin Hibbits if ((uses_funcdesc || shn == sym->st_shndx) && 819b08e2b04SJustin Hibbits symval <= addr && 820b08e2b04SJustin Hibbits addr < symval + sym->st_size) { 8216ff6d951SJohn Birrell if (GELF_ST_BIND(sym->st_info) == STB_GLOBAL) 8226ff6d951SJohn Birrell return (0); 8236ff6d951SJohn Birrell 8246ff6d951SJohn Birrell ret = 0; 8256ff6d951SJohn Birrell s = *sym; 8266ff6d951SJohn Birrell } 8276ff6d951SJohn Birrell } 828b08e2b04SJustin Hibbits } 8296ff6d951SJohn Birrell 8306ff6d951SJohn Birrell if (ret == 0) 8316ff6d951SJohn Birrell *sym = s; 8326ff6d951SJohn Birrell return (ret); 8336ff6d951SJohn Birrell } 8346ff6d951SJohn Birrell 835b78ee15eSRuslan Bukin #if defined(__aarch64__) 836b78ee15eSRuslan Bukin /* XXX */ 837b78ee15eSRuslan Bukin static int 838b78ee15eSRuslan Bukin dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 839b78ee15eSRuslan Bukin uint32_t *off) 840b78ee15eSRuslan Bukin { 841b78ee15eSRuslan Bukin printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 842b78ee15eSRuslan Bukin return (0); 843b78ee15eSRuslan Bukin } 844b78ee15eSRuslan Bukin #elif defined(__arm__) 8452693feb4SJohn Birrell /* XXX */ 8462693feb4SJohn Birrell static int 8472693feb4SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 8482693feb4SJohn Birrell uint32_t *off) 8492693feb4SJohn Birrell { 8502693feb4SJohn Birrell printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 8512693feb4SJohn Birrell return (0); 8522693feb4SJohn Birrell } 8532693feb4SJohn Birrell #elif defined(__mips__) 8542693feb4SJohn Birrell /* XXX */ 8552693feb4SJohn Birrell static int 8562693feb4SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 8572693feb4SJohn Birrell uint32_t *off) 8582693feb4SJohn Birrell { 8592693feb4SJohn Birrell printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 8602693feb4SJohn Birrell return (0); 8612693feb4SJohn Birrell } 8622693feb4SJohn Birrell #elif defined(__powerpc__) 86330b318b9SJustin Hibbits /* The sentinel is 'xor r3,r3,r3'. */ 86430b318b9SJustin Hibbits #define DT_OP_XOR_R3 0x7c631a78 86530b318b9SJustin Hibbits 86630b318b9SJustin Hibbits #define DT_OP_NOP 0x60000000 86730b318b9SJustin Hibbits #define DT_OP_BLR 0x4e800020 86830b318b9SJustin Hibbits 86930b318b9SJustin Hibbits /* This captures all forms of branching to address. */ 87030b318b9SJustin Hibbits #define DT_IS_BRANCH(inst) ((inst & 0xfc000000) == 0x48000000) 87130b318b9SJustin Hibbits #define DT_IS_BL(inst) (DT_IS_BRANCH(inst) && (inst & 0x01)) 87230b318b9SJustin Hibbits 8732693feb4SJohn Birrell /* XXX */ 8742693feb4SJohn Birrell static int 8752693feb4SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 8762693feb4SJohn Birrell uint32_t *off) 8772693feb4SJohn Birrell { 87830b318b9SJustin Hibbits uint32_t *ip; 87930b318b9SJustin Hibbits 88030b318b9SJustin Hibbits if ((rela->r_offset & (sizeof (uint32_t) - 1)) != 0) 88130b318b9SJustin Hibbits return (-1); 88230b318b9SJustin Hibbits 88330b318b9SJustin Hibbits /*LINTED*/ 88430b318b9SJustin Hibbits ip = (uint32_t *)(p + rela->r_offset); 88530b318b9SJustin Hibbits 88630b318b9SJustin Hibbits /* 88730b318b9SJustin Hibbits * We only know about some specific relocation types. 88830b318b9SJustin Hibbits */ 88930b318b9SJustin Hibbits if (GELF_R_TYPE(rela->r_info) != R_PPC_REL24 && 89030b318b9SJustin Hibbits GELF_R_TYPE(rela->r_info) != R_PPC_PLTREL24) 89130b318b9SJustin Hibbits return (-1); 89230b318b9SJustin Hibbits 89330b318b9SJustin Hibbits /* 89430b318b9SJustin Hibbits * We may have already processed this object file in an earlier linker 89530b318b9SJustin Hibbits * invocation. Check to see if the present instruction sequence matches 89630b318b9SJustin Hibbits * the one we would install below. 89730b318b9SJustin Hibbits */ 89830b318b9SJustin Hibbits if (isenabled) { 89930b318b9SJustin Hibbits if (ip[0] == DT_OP_XOR_R3) { 90030b318b9SJustin Hibbits (*off) += sizeof (ip[0]); 90130b318b9SJustin Hibbits return (0); 90230b318b9SJustin Hibbits } 90330b318b9SJustin Hibbits } else { 90430b318b9SJustin Hibbits if (ip[0] == DT_OP_NOP) { 90530b318b9SJustin Hibbits (*off) += sizeof (ip[0]); 90630b318b9SJustin Hibbits return (0); 90730b318b9SJustin Hibbits } 90830b318b9SJustin Hibbits } 90930b318b9SJustin Hibbits 91030b318b9SJustin Hibbits /* 91130b318b9SJustin Hibbits * We only expect branch to address instructions. 91230b318b9SJustin Hibbits */ 91330b318b9SJustin Hibbits if (!DT_IS_BRANCH(ip[0])) { 91430b318b9SJustin Hibbits dt_dprintf("found %x instead of a branch instruction at %llx\n", 91530b318b9SJustin Hibbits ip[0], (u_longlong_t)rela->r_offset); 91630b318b9SJustin Hibbits return (-1); 91730b318b9SJustin Hibbits } 91830b318b9SJustin Hibbits 91930b318b9SJustin Hibbits if (isenabled) { 92030b318b9SJustin Hibbits /* 92130b318b9SJustin Hibbits * It would necessarily indicate incorrect usage if an is- 92230b318b9SJustin Hibbits * enabled probe were tail-called so flag that as an error. 92330b318b9SJustin Hibbits * It's also potentially (very) tricky to handle gracefully, 92430b318b9SJustin Hibbits * but could be done if this were a desired use scenario. 92530b318b9SJustin Hibbits */ 92630b318b9SJustin Hibbits if (!DT_IS_BL(ip[0])) { 92730b318b9SJustin Hibbits dt_dprintf("tail call to is-enabled probe at %llx\n", 92830b318b9SJustin Hibbits (u_longlong_t)rela->r_offset); 92930b318b9SJustin Hibbits return (-1); 93030b318b9SJustin Hibbits } 93130b318b9SJustin Hibbits 93230b318b9SJustin Hibbits ip[0] = DT_OP_XOR_R3; 93330b318b9SJustin Hibbits (*off) += sizeof (ip[0]); 93430b318b9SJustin Hibbits } else { 93530b318b9SJustin Hibbits if (DT_IS_BL(ip[0])) 93630b318b9SJustin Hibbits ip[0] = DT_OP_NOP; 93730b318b9SJustin Hibbits else 93830b318b9SJustin Hibbits ip[0] = DT_OP_BLR; 93930b318b9SJustin Hibbits } 94030b318b9SJustin Hibbits 9412693feb4SJohn Birrell return (0); 9422693feb4SJohn Birrell } 943fed1ca4bSRuslan Bukin #elif defined(__riscv__) 944fed1ca4bSRuslan Bukin /* XXX */ 945fed1ca4bSRuslan Bukin static int 946fed1ca4bSRuslan Bukin dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 947fed1ca4bSRuslan Bukin uint32_t *off) 948fed1ca4bSRuslan Bukin { 949fed1ca4bSRuslan Bukin printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 950fed1ca4bSRuslan Bukin return (0); 951fed1ca4bSRuslan Bukin } 9522693feb4SJohn Birrell #elif defined(__sparc) 9536ff6d951SJohn Birrell 9546ff6d951SJohn Birrell #define DT_OP_RET 0x81c7e008 9556ff6d951SJohn Birrell #define DT_OP_NOP 0x01000000 9566ff6d951SJohn Birrell #define DT_OP_CALL 0x40000000 9576ff6d951SJohn Birrell #define DT_OP_CLR_O0 0x90102000 9586ff6d951SJohn Birrell 9596ff6d951SJohn Birrell #define DT_IS_MOV_O7(inst) (((inst) & 0xffffe000) == 0x9e100000) 9606ff6d951SJohn Birrell #define DT_IS_RESTORE(inst) (((inst) & 0xc1f80000) == 0x81e80000) 9616ff6d951SJohn Birrell #define DT_IS_RETL(inst) (((inst) & 0xfff83fff) == 0x81c02008) 9626ff6d951SJohn Birrell 9636ff6d951SJohn Birrell #define DT_RS2(inst) ((inst) & 0x1f) 9646ff6d951SJohn Birrell #define DT_MAKE_RETL(reg) (0x81c02008 | ((reg) << 14)) 9656ff6d951SJohn Birrell 9666ff6d951SJohn Birrell /*ARGSUSED*/ 9676ff6d951SJohn Birrell static int 9686ff6d951SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 9696ff6d951SJohn Birrell uint32_t *off) 9706ff6d951SJohn Birrell { 9716ff6d951SJohn Birrell uint32_t *ip; 9726ff6d951SJohn Birrell 9736ff6d951SJohn Birrell if ((rela->r_offset & (sizeof (uint32_t) - 1)) != 0) 9746ff6d951SJohn Birrell return (-1); 9756ff6d951SJohn Birrell 9766ff6d951SJohn Birrell /*LINTED*/ 9776ff6d951SJohn Birrell ip = (uint32_t *)(p + rela->r_offset); 9786ff6d951SJohn Birrell 9796ff6d951SJohn Birrell /* 9806ff6d951SJohn Birrell * We only know about some specific relocation types. 9816ff6d951SJohn Birrell */ 9826ff6d951SJohn Birrell if (GELF_R_TYPE(rela->r_info) != R_SPARC_WDISP30 && 9836ff6d951SJohn Birrell GELF_R_TYPE(rela->r_info) != R_SPARC_WPLT30) 9846ff6d951SJohn Birrell return (-1); 9856ff6d951SJohn Birrell 9866ff6d951SJohn Birrell /* 9876ff6d951SJohn Birrell * We may have already processed this object file in an earlier linker 9886ff6d951SJohn Birrell * invocation. Check to see if the present instruction sequence matches 98956b35563SCraig Rodrigues * the one we would install below. 9906ff6d951SJohn Birrell */ 9916ff6d951SJohn Birrell if (isenabled) { 99256b35563SCraig Rodrigues if (ip[0] == DT_OP_NOP) { 99356b35563SCraig Rodrigues (*off) += sizeof (ip[0]); 9946ff6d951SJohn Birrell return (0); 99556b35563SCraig Rodrigues } 9966ff6d951SJohn Birrell } else { 9976ff6d951SJohn Birrell if (DT_IS_RESTORE(ip[1])) { 99856b35563SCraig Rodrigues if (ip[0] == DT_OP_RET) { 99956b35563SCraig Rodrigues (*off) += sizeof (ip[0]); 10006ff6d951SJohn Birrell return (0); 100156b35563SCraig Rodrigues } 10026ff6d951SJohn Birrell } else if (DT_IS_MOV_O7(ip[1])) { 10036ff6d951SJohn Birrell if (DT_IS_RETL(ip[0])) 10046ff6d951SJohn Birrell return (0); 10056ff6d951SJohn Birrell } else { 10066ff6d951SJohn Birrell if (ip[0] == DT_OP_NOP) { 10076ff6d951SJohn Birrell (*off) += sizeof (ip[0]); 10086ff6d951SJohn Birrell return (0); 10096ff6d951SJohn Birrell } 10106ff6d951SJohn Birrell } 10116ff6d951SJohn Birrell } 10126ff6d951SJohn Birrell 10136ff6d951SJohn Birrell /* 10146ff6d951SJohn Birrell * We only expect call instructions with a displacement of 0. 10156ff6d951SJohn Birrell */ 10166ff6d951SJohn Birrell if (ip[0] != DT_OP_CALL) { 10176ff6d951SJohn Birrell dt_dprintf("found %x instead of a call instruction at %llx\n", 10186ff6d951SJohn Birrell ip[0], (u_longlong_t)rela->r_offset); 10196ff6d951SJohn Birrell return (-1); 10206ff6d951SJohn Birrell } 10216ff6d951SJohn Birrell 10226ff6d951SJohn Birrell if (isenabled) { 10236ff6d951SJohn Birrell /* 10246ff6d951SJohn Birrell * It would necessarily indicate incorrect usage if an is- 10256ff6d951SJohn Birrell * enabled probe were tail-called so flag that as an error. 10266ff6d951SJohn Birrell * It's also potentially (very) tricky to handle gracefully, 10276ff6d951SJohn Birrell * but could be done if this were a desired use scenario. 10286ff6d951SJohn Birrell */ 10296ff6d951SJohn Birrell if (DT_IS_RESTORE(ip[1]) || DT_IS_MOV_O7(ip[1])) { 10306ff6d951SJohn Birrell dt_dprintf("tail call to is-enabled probe at %llx\n", 10316ff6d951SJohn Birrell (u_longlong_t)rela->r_offset); 10326ff6d951SJohn Birrell return (-1); 10336ff6d951SJohn Birrell } 10346ff6d951SJohn Birrell 103556b35563SCraig Rodrigues 103656b35563SCraig Rodrigues /* 103756b35563SCraig Rodrigues * On SPARC, we take advantage of the fact that the first 103856b35563SCraig Rodrigues * argument shares the same register as for the return value. 103956b35563SCraig Rodrigues * The macro handles the work of zeroing that register so we 104056b35563SCraig Rodrigues * don't need to do anything special here. We instrument the 104156b35563SCraig Rodrigues * instruction in the delay slot as we'll need to modify the 104256b35563SCraig Rodrigues * return register after that instruction has been emulated. 104356b35563SCraig Rodrigues */ 104456b35563SCraig Rodrigues ip[0] = DT_OP_NOP; 104556b35563SCraig Rodrigues (*off) += sizeof (ip[0]); 10466ff6d951SJohn Birrell } else { 10476ff6d951SJohn Birrell /* 10486ff6d951SJohn Birrell * If the call is followed by a restore, it's a tail call so 10496ff6d951SJohn Birrell * change the call to a ret. If the call if followed by a mov 10506ff6d951SJohn Birrell * of a register into %o7, it's a tail call in leaf context 10516ff6d951SJohn Birrell * so change the call to a retl-like instruction that returns 10526ff6d951SJohn Birrell * to that register value + 8 (rather than the typical %o7 + 10536ff6d951SJohn Birrell * 8); the delay slot instruction is left, but should have no 105456b35563SCraig Rodrigues * effect. Otherwise we change the call to be a nop. We 105556b35563SCraig Rodrigues * identify the subsequent instruction as the probe point in 105656b35563SCraig Rodrigues * all but the leaf tail-call case to ensure that arguments to 105756b35563SCraig Rodrigues * the probe are complete and consistent. An astute, though 105856b35563SCraig Rodrigues * largely hypothetical, observer would note that there is the 105956b35563SCraig Rodrigues * possibility of a false-positive probe firing if the function 106056b35563SCraig Rodrigues * contained a branch to the instruction in the delay slot of 106156b35563SCraig Rodrigues * the call. Fixing this would require significant in-kernel 106256b35563SCraig Rodrigues * modifications, and isn't worth doing until we see it in the 106356b35563SCraig Rodrigues * wild. 10646ff6d951SJohn Birrell */ 10656ff6d951SJohn Birrell if (DT_IS_RESTORE(ip[1])) { 10666ff6d951SJohn Birrell ip[0] = DT_OP_RET; 10676ff6d951SJohn Birrell (*off) += sizeof (ip[0]); 10686ff6d951SJohn Birrell } else if (DT_IS_MOV_O7(ip[1])) { 10696ff6d951SJohn Birrell ip[0] = DT_MAKE_RETL(DT_RS2(ip[1])); 10706ff6d951SJohn Birrell } else { 10716ff6d951SJohn Birrell ip[0] = DT_OP_NOP; 10726ff6d951SJohn Birrell (*off) += sizeof (ip[0]); 10736ff6d951SJohn Birrell } 10746ff6d951SJohn Birrell } 10756ff6d951SJohn Birrell 10766ff6d951SJohn Birrell return (0); 10776ff6d951SJohn Birrell } 10786ff6d951SJohn Birrell 10796ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 10806ff6d951SJohn Birrell 10816ff6d951SJohn Birrell #define DT_OP_NOP 0x90 10822693feb4SJohn Birrell #define DT_OP_RET 0xc3 10836ff6d951SJohn Birrell #define DT_OP_CALL 0xe8 10842693feb4SJohn Birrell #define DT_OP_JMP32 0xe9 10856ff6d951SJohn Birrell #define DT_OP_REX_RAX 0x48 10866ff6d951SJohn Birrell #define DT_OP_XOR_EAX_0 0x33 10876ff6d951SJohn Birrell #define DT_OP_XOR_EAX_1 0xc0 10886ff6d951SJohn Birrell 10896ff6d951SJohn Birrell static int 10906ff6d951SJohn Birrell dt_modtext(dtrace_hdl_t *dtp, char *p, int isenabled, GElf_Rela *rela, 10916ff6d951SJohn Birrell uint32_t *off) 10926ff6d951SJohn Birrell { 10936ff6d951SJohn Birrell uint8_t *ip = (uint8_t *)(p + rela->r_offset - 1); 10942693feb4SJohn Birrell uint8_t ret; 10956ff6d951SJohn Birrell 10966ff6d951SJohn Birrell /* 10976ff6d951SJohn Birrell * On x86, the first byte of the instruction is the call opcode and 10986ff6d951SJohn Birrell * the next four bytes are the 32-bit address; the relocation is for 10996ff6d951SJohn Birrell * the address operand. We back up the offset to the first byte of 11006ff6d951SJohn Birrell * the instruction. For is-enabled probes, we later advance the offset 11016ff6d951SJohn Birrell * so that it hits the first nop in the instruction sequence. 11026ff6d951SJohn Birrell */ 11036ff6d951SJohn Birrell (*off) -= 1; 11046ff6d951SJohn Birrell 11056ff6d951SJohn Birrell /* 11066ff6d951SJohn Birrell * We only know about some specific relocation types. Luckily 11076ff6d951SJohn Birrell * these types have the same values on both 32-bit and 64-bit 11086ff6d951SJohn Birrell * x86 architectures. 11096ff6d951SJohn Birrell */ 11106ff6d951SJohn Birrell if (GELF_R_TYPE(rela->r_info) != R_386_PC32 && 11116ff6d951SJohn Birrell GELF_R_TYPE(rela->r_info) != R_386_PLT32) 11126ff6d951SJohn Birrell return (-1); 11136ff6d951SJohn Birrell 11146ff6d951SJohn Birrell /* 11156ff6d951SJohn Birrell * We may have already processed this object file in an earlier linker 11166ff6d951SJohn Birrell * invocation. Check to see if the present instruction sequence matches 11176ff6d951SJohn Birrell * the one we would install. For is-enabled probes, we advance the 11182693feb4SJohn Birrell * offset to the first nop instruction in the sequence to match the 11192693feb4SJohn Birrell * text modification code below. 11206ff6d951SJohn Birrell */ 11216ff6d951SJohn Birrell if (!isenabled) { 11222693feb4SJohn Birrell if ((ip[0] == DT_OP_NOP || ip[0] == DT_OP_RET) && 11232693feb4SJohn Birrell ip[1] == DT_OP_NOP && ip[2] == DT_OP_NOP && 11242693feb4SJohn Birrell ip[3] == DT_OP_NOP && ip[4] == DT_OP_NOP) 11256ff6d951SJohn Birrell return (0); 11266ff6d951SJohn Birrell } else if (dtp->dt_oflags & DTRACE_O_LP64) { 11276ff6d951SJohn Birrell if (ip[0] == DT_OP_REX_RAX && 11286ff6d951SJohn Birrell ip[1] == DT_OP_XOR_EAX_0 && ip[2] == DT_OP_XOR_EAX_1 && 11292693feb4SJohn Birrell (ip[3] == DT_OP_NOP || ip[3] == DT_OP_RET) && 11302693feb4SJohn Birrell ip[4] == DT_OP_NOP) { 11316ff6d951SJohn Birrell (*off) += 3; 11326ff6d951SJohn Birrell return (0); 11336ff6d951SJohn Birrell } 11346ff6d951SJohn Birrell } else { 11356ff6d951SJohn Birrell if (ip[0] == DT_OP_XOR_EAX_0 && ip[1] == DT_OP_XOR_EAX_1 && 11362693feb4SJohn Birrell (ip[2] == DT_OP_NOP || ip[2] == DT_OP_RET) && 11372693feb4SJohn Birrell ip[3] == DT_OP_NOP && ip[4] == DT_OP_NOP) { 11386ff6d951SJohn Birrell (*off) += 2; 11396ff6d951SJohn Birrell return (0); 11406ff6d951SJohn Birrell } 11416ff6d951SJohn Birrell } 11426ff6d951SJohn Birrell 11436ff6d951SJohn Birrell /* 11442693feb4SJohn Birrell * We expect either a call instrution with a 32-bit displacement or a 11452693feb4SJohn Birrell * jmp instruction with a 32-bit displacement acting as a tail-call. 11466ff6d951SJohn Birrell */ 11472693feb4SJohn Birrell if (ip[0] != DT_OP_CALL && ip[0] != DT_OP_JMP32) { 11482693feb4SJohn Birrell dt_dprintf("found %x instead of a call or jmp instruction at " 11492693feb4SJohn Birrell "%llx\n", ip[0], (u_longlong_t)rela->r_offset); 11506ff6d951SJohn Birrell return (-1); 11516ff6d951SJohn Birrell } 11526ff6d951SJohn Birrell 11532693feb4SJohn Birrell ret = (ip[0] == DT_OP_JMP32) ? DT_OP_RET : DT_OP_NOP; 11542693feb4SJohn Birrell 11556ff6d951SJohn Birrell /* 11566ff6d951SJohn Birrell * Establish the instruction sequence -- all nops for probes, and an 11576ff6d951SJohn Birrell * instruction to clear the return value register (%eax/%rax) followed 11586ff6d951SJohn Birrell * by nops for is-enabled probes. For is-enabled probes, we advance 11596ff6d951SJohn Birrell * the offset to the first nop. This isn't stricly necessary but makes 11606ff6d951SJohn Birrell * for more readable disassembly when the probe is enabled. 11616ff6d951SJohn Birrell */ 11626ff6d951SJohn Birrell if (!isenabled) { 11632693feb4SJohn Birrell ip[0] = ret; 11646ff6d951SJohn Birrell ip[1] = DT_OP_NOP; 11656ff6d951SJohn Birrell ip[2] = DT_OP_NOP; 11666ff6d951SJohn Birrell ip[3] = DT_OP_NOP; 11676ff6d951SJohn Birrell ip[4] = DT_OP_NOP; 11686ff6d951SJohn Birrell } else if (dtp->dt_oflags & DTRACE_O_LP64) { 11696ff6d951SJohn Birrell ip[0] = DT_OP_REX_RAX; 11706ff6d951SJohn Birrell ip[1] = DT_OP_XOR_EAX_0; 11716ff6d951SJohn Birrell ip[2] = DT_OP_XOR_EAX_1; 11722693feb4SJohn Birrell ip[3] = ret; 11736ff6d951SJohn Birrell ip[4] = DT_OP_NOP; 11746ff6d951SJohn Birrell (*off) += 3; 11756ff6d951SJohn Birrell } else { 11766ff6d951SJohn Birrell ip[0] = DT_OP_XOR_EAX_0; 11776ff6d951SJohn Birrell ip[1] = DT_OP_XOR_EAX_1; 11782693feb4SJohn Birrell ip[2] = ret; 11796ff6d951SJohn Birrell ip[3] = DT_OP_NOP; 11806ff6d951SJohn Birrell ip[4] = DT_OP_NOP; 11816ff6d951SJohn Birrell (*off) += 2; 11826ff6d951SJohn Birrell } 11836ff6d951SJohn Birrell 11846ff6d951SJohn Birrell return (0); 11856ff6d951SJohn Birrell } 11866ff6d951SJohn Birrell 11876ff6d951SJohn Birrell #else 11886ff6d951SJohn Birrell #error unknown ISA 11896ff6d951SJohn Birrell #endif 11906ff6d951SJohn Birrell 11916ff6d951SJohn Birrell /*PRINTFLIKE5*/ 11926ff6d951SJohn Birrell static int 11936ff6d951SJohn Birrell dt_link_error(dtrace_hdl_t *dtp, Elf *elf, int fd, dt_link_pair_t *bufs, 11946ff6d951SJohn Birrell const char *format, ...) 11956ff6d951SJohn Birrell { 11966ff6d951SJohn Birrell va_list ap; 11976ff6d951SJohn Birrell dt_link_pair_t *pair; 11986ff6d951SJohn Birrell 11996ff6d951SJohn Birrell va_start(ap, format); 12006ff6d951SJohn Birrell dt_set_errmsg(dtp, NULL, NULL, NULL, 0, format, ap); 12016ff6d951SJohn Birrell va_end(ap); 12026ff6d951SJohn Birrell 12036ff6d951SJohn Birrell if (elf != NULL) 12046ff6d951SJohn Birrell (void) elf_end(elf); 12056ff6d951SJohn Birrell 12066ff6d951SJohn Birrell if (fd >= 0) 12076ff6d951SJohn Birrell (void) close(fd); 12086ff6d951SJohn Birrell 12096ff6d951SJohn Birrell while ((pair = bufs) != NULL) { 12106ff6d951SJohn Birrell bufs = pair->dlp_next; 12116ff6d951SJohn Birrell dt_free(dtp, pair->dlp_str); 12126ff6d951SJohn Birrell dt_free(dtp, pair->dlp_sym); 12136ff6d951SJohn Birrell dt_free(dtp, pair); 12146ff6d951SJohn Birrell } 12156ff6d951SJohn Birrell 12166ff6d951SJohn Birrell return (dt_set_errno(dtp, EDT_COMPILER)); 12176ff6d951SJohn Birrell } 12186ff6d951SJohn Birrell 12196ff6d951SJohn Birrell static int 12206ff6d951SJohn Birrell process_obj(dtrace_hdl_t *dtp, const char *obj, int *eprobesp) 12216ff6d951SJohn Birrell { 12226ff6d951SJohn Birrell static const char dt_prefix[] = "__dtrace"; 12236ff6d951SJohn Birrell static const char dt_enabled[] = "enabled"; 12246ff6d951SJohn Birrell static const char dt_symprefix[] = "$dtrace"; 12258b6b79ceSDimitry Andric static const char dt_symfmt[] = "%s%ld.%s"; 12263a3e3279SMark Johnston char probename[DTRACE_NAMELEN]; 12276ff6d951SJohn Birrell int fd, i, ndx, eprobe, mod = 0; 12286ff6d951SJohn Birrell Elf *elf = NULL; 12296ff6d951SJohn Birrell GElf_Ehdr ehdr; 12306ff6d951SJohn Birrell Elf_Scn *scn_rel, *scn_sym, *scn_str, *scn_tgt; 12316ff6d951SJohn Birrell Elf_Data *data_rel, *data_sym, *data_str, *data_tgt; 12326ff6d951SJohn Birrell GElf_Shdr shdr_rel, shdr_sym, shdr_str, shdr_tgt; 12336ff6d951SJohn Birrell GElf_Sym rsym, fsym, dsym; 12346ff6d951SJohn Birrell GElf_Rela rela; 12356ff6d951SJohn Birrell char *s, *p, *r; 12366ff6d951SJohn Birrell char pname[DTRACE_PROVNAMELEN]; 12376ff6d951SJohn Birrell dt_provider_t *pvp; 12386ff6d951SJohn Birrell dt_probe_t *prp; 12396ff6d951SJohn Birrell uint32_t off, eclass, emachine1, emachine2; 12406ff6d951SJohn Birrell size_t symsize, nsym, isym, istr, len; 12416ff6d951SJohn Birrell key_t objkey; 12426ff6d951SJohn Birrell dt_link_pair_t *pair, *bufs = NULL; 12436ff6d951SJohn Birrell dt_strtab_t *strtab; 12446ff6d951SJohn Birrell 12456ff6d951SJohn Birrell if ((fd = open64(obj, O_RDWR)) == -1) { 12466ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 12476ff6d951SJohn Birrell "failed to open %s: %s", obj, strerror(errno))); 12486ff6d951SJohn Birrell } 12496ff6d951SJohn Birrell 12506ff6d951SJohn Birrell if ((elf = elf_begin(fd, ELF_C_RDWR, NULL)) == NULL) { 12516ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 12526ff6d951SJohn Birrell "failed to process %s: %s", obj, elf_errmsg(elf_errno()))); 12536ff6d951SJohn Birrell } 12546ff6d951SJohn Birrell 12556ff6d951SJohn Birrell switch (elf_kind(elf)) { 12566ff6d951SJohn Birrell case ELF_K_ELF: 12576ff6d951SJohn Birrell break; 12586ff6d951SJohn Birrell case ELF_K_AR: 12596ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, "archives are not " 12606ff6d951SJohn Birrell "permitted; use the contents of the archive instead: %s", 12616ff6d951SJohn Birrell obj)); 12626ff6d951SJohn Birrell default: 12636ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 12646ff6d951SJohn Birrell "invalid file type: %s", obj)); 12656ff6d951SJohn Birrell } 12666ff6d951SJohn Birrell 12676ff6d951SJohn Birrell if (gelf_getehdr(elf, &ehdr) == NULL) { 12686ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, "corrupt file: %s", 12696ff6d951SJohn Birrell obj)); 12706ff6d951SJohn Birrell } 12716ff6d951SJohn Birrell 12726ff6d951SJohn Birrell if (dtp->dt_oflags & DTRACE_O_LP64) { 12736ff6d951SJohn Birrell eclass = ELFCLASS64; 1274e7d939bdSMarcel Moolenaar #if defined(__mips__) 12752693feb4SJohn Birrell emachine1 = emachine2 = EM_MIPS; 12762693feb4SJohn Birrell #elif defined(__powerpc__) 12772693feb4SJohn Birrell emachine1 = emachine2 = EM_PPC64; 12782693feb4SJohn Birrell #elif defined(__sparc) 12796ff6d951SJohn Birrell emachine1 = emachine2 = EM_SPARCV9; 12806ff6d951SJohn Birrell #elif defined(__i386) || defined(__amd64) 12816ff6d951SJohn Birrell emachine1 = emachine2 = EM_AMD64; 12826ff6d951SJohn Birrell #endif 12836ff6d951SJohn Birrell symsize = sizeof (Elf64_Sym); 12846ff6d951SJohn Birrell } else { 12856ff6d951SJohn Birrell eclass = ELFCLASS32; 12862693feb4SJohn Birrell #if defined(__arm__) 12872693feb4SJohn Birrell emachine1 = emachine2 = EM_ARM; 12882693feb4SJohn Birrell #elif defined(__mips__) 12892693feb4SJohn Birrell emachine1 = emachine2 = EM_MIPS; 12902693feb4SJohn Birrell #elif defined(__powerpc__) 12912693feb4SJohn Birrell emachine1 = emachine2 = EM_PPC; 12922693feb4SJohn Birrell #elif defined(__sparc) 12936ff6d951SJohn Birrell emachine1 = EM_SPARC; 12946ff6d951SJohn Birrell emachine2 = EM_SPARC32PLUS; 1295e7d939bdSMarcel Moolenaar #elif defined(__i386) || defined(__amd64) 12966ff6d951SJohn Birrell emachine1 = emachine2 = EM_386; 12976ff6d951SJohn Birrell #endif 12986ff6d951SJohn Birrell symsize = sizeof (Elf32_Sym); 12996ff6d951SJohn Birrell } 13006ff6d951SJohn Birrell 13016ff6d951SJohn Birrell if (ehdr.e_ident[EI_CLASS] != eclass) { 13026ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 13036ff6d951SJohn Birrell "incorrect ELF class for object file: %s", obj)); 13046ff6d951SJohn Birrell } 13056ff6d951SJohn Birrell 13066ff6d951SJohn Birrell if (ehdr.e_machine != emachine1 && ehdr.e_machine != emachine2) { 13076ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 13086ff6d951SJohn Birrell "incorrect ELF machine type for object file: %s", obj)); 13096ff6d951SJohn Birrell } 13106ff6d951SJohn Birrell 13116ff6d951SJohn Birrell /* 13126ff6d951SJohn Birrell * We use this token as a relatively unique handle for this file on the 13136ff6d951SJohn Birrell * system in order to disambiguate potential conflicts between files of 13146ff6d951SJohn Birrell * the same name which contain identially named local symbols. 13156ff6d951SJohn Birrell */ 13166ff6d951SJohn Birrell if ((objkey = ftok(obj, 0)) == (key_t)-1) { 13176ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 13186ff6d951SJohn Birrell "failed to generate unique key for object file: %s", obj)); 13196ff6d951SJohn Birrell } 13206ff6d951SJohn Birrell 13216ff6d951SJohn Birrell scn_rel = NULL; 13226ff6d951SJohn Birrell while ((scn_rel = elf_nextscn(elf, scn_rel)) != NULL) { 13236ff6d951SJohn Birrell if (gelf_getshdr(scn_rel, &shdr_rel) == NULL) 13246ff6d951SJohn Birrell goto err; 13256ff6d951SJohn Birrell 13266ff6d951SJohn Birrell /* 13276ff6d951SJohn Birrell * Skip any non-relocation sections. 13286ff6d951SJohn Birrell */ 13296ff6d951SJohn Birrell if (shdr_rel.sh_type != SHT_RELA && shdr_rel.sh_type != SHT_REL) 13306ff6d951SJohn Birrell continue; 13316ff6d951SJohn Birrell 13326ff6d951SJohn Birrell if ((data_rel = elf_getdata(scn_rel, NULL)) == NULL) 13336ff6d951SJohn Birrell goto err; 13346ff6d951SJohn Birrell 13356ff6d951SJohn Birrell /* 13366ff6d951SJohn Birrell * Grab the section, section header and section data for the 13376ff6d951SJohn Birrell * symbol table that this relocation section references. 13386ff6d951SJohn Birrell */ 13396ff6d951SJohn Birrell if ((scn_sym = elf_getscn(elf, shdr_rel.sh_link)) == NULL || 13406ff6d951SJohn Birrell gelf_getshdr(scn_sym, &shdr_sym) == NULL || 13416ff6d951SJohn Birrell (data_sym = elf_getdata(scn_sym, NULL)) == NULL) 13426ff6d951SJohn Birrell goto err; 13436ff6d951SJohn Birrell 13446ff6d951SJohn Birrell /* 13456ff6d951SJohn Birrell * Ditto for that symbol table's string table. 13466ff6d951SJohn Birrell */ 13476ff6d951SJohn Birrell if ((scn_str = elf_getscn(elf, shdr_sym.sh_link)) == NULL || 13486ff6d951SJohn Birrell gelf_getshdr(scn_str, &shdr_str) == NULL || 13496ff6d951SJohn Birrell (data_str = elf_getdata(scn_str, NULL)) == NULL) 13506ff6d951SJohn Birrell goto err; 13516ff6d951SJohn Birrell 13526ff6d951SJohn Birrell /* 13536ff6d951SJohn Birrell * Grab the section, section header and section data for the 13546ff6d951SJohn Birrell * target section for the relocations. For the relocations 13556ff6d951SJohn Birrell * we're looking for -- this will typically be the text of the 13566ff6d951SJohn Birrell * object file. 13576ff6d951SJohn Birrell */ 13586ff6d951SJohn Birrell if ((scn_tgt = elf_getscn(elf, shdr_rel.sh_info)) == NULL || 13596ff6d951SJohn Birrell gelf_getshdr(scn_tgt, &shdr_tgt) == NULL || 13606ff6d951SJohn Birrell (data_tgt = elf_getdata(scn_tgt, NULL)) == NULL) 13616ff6d951SJohn Birrell goto err; 13626ff6d951SJohn Birrell 13636ff6d951SJohn Birrell /* 13646ff6d951SJohn Birrell * We're looking for relocations to symbols matching this form: 13656ff6d951SJohn Birrell * 13666ff6d951SJohn Birrell * __dtrace[enabled]_<prov>___<probe> 13676ff6d951SJohn Birrell * 13686ff6d951SJohn Birrell * For the generated object, we need to record the location 13696ff6d951SJohn Birrell * identified by the relocation, and create a new relocation 13706ff6d951SJohn Birrell * in the generated object that will be resolved at link time 13716ff6d951SJohn Birrell * to the location of the function in which the probe is 13726ff6d951SJohn Birrell * embedded. In the target object, we change the matched symbol 13736ff6d951SJohn Birrell * so that it will be ignored at link time, and we modify the 13746ff6d951SJohn Birrell * target (text) section to replace the call instruction with 13756ff6d951SJohn Birrell * one or more nops. 13766ff6d951SJohn Birrell * 13776ff6d951SJohn Birrell * If the function containing the probe is locally scoped 13786ff6d951SJohn Birrell * (static), we create an alias used by the relocation in the 13796ff6d951SJohn Birrell * generated object. The alias, a new symbol, will be global 13806ff6d951SJohn Birrell * (so that the relocation from the generated object can be 13816ff6d951SJohn Birrell * resolved), and hidden (so that it is converted to a local 13826ff6d951SJohn Birrell * symbol at link time). Such aliases have this form: 13836ff6d951SJohn Birrell * 13846ff6d951SJohn Birrell * $dtrace<key>.<function> 13856ff6d951SJohn Birrell * 13866ff6d951SJohn Birrell * We take a first pass through all the relocations to 13876ff6d951SJohn Birrell * populate our string table and count the number of extra 13886ff6d951SJohn Birrell * symbols we'll require. 13896ff6d951SJohn Birrell */ 13906ff6d951SJohn Birrell strtab = dt_strtab_create(1); 13916ff6d951SJohn Birrell nsym = 0; 13926ff6d951SJohn Birrell isym = data_sym->d_size / symsize; 13936ff6d951SJohn Birrell istr = data_str->d_size; 13946ff6d951SJohn Birrell 13956ff6d951SJohn Birrell for (i = 0; i < shdr_rel.sh_size / shdr_rel.sh_entsize; i++) { 13966ff6d951SJohn Birrell 13976ff6d951SJohn Birrell if (shdr_rel.sh_type == SHT_RELA) { 13986ff6d951SJohn Birrell if (gelf_getrela(data_rel, i, &rela) == NULL) 13996ff6d951SJohn Birrell continue; 14006ff6d951SJohn Birrell } else { 14016ff6d951SJohn Birrell GElf_Rel rel; 14026ff6d951SJohn Birrell if (gelf_getrel(data_rel, i, &rel) == NULL) 14036ff6d951SJohn Birrell continue; 14046ff6d951SJohn Birrell rela.r_offset = rel.r_offset; 14056ff6d951SJohn Birrell rela.r_info = rel.r_info; 14066ff6d951SJohn Birrell rela.r_addend = 0; 14076ff6d951SJohn Birrell } 14086ff6d951SJohn Birrell 14096ff6d951SJohn Birrell if (gelf_getsym(data_sym, GELF_R_SYM(rela.r_info), 14106ff6d951SJohn Birrell &rsym) == NULL) { 14116ff6d951SJohn Birrell dt_strtab_destroy(strtab); 14126ff6d951SJohn Birrell goto err; 14136ff6d951SJohn Birrell } 14146ff6d951SJohn Birrell 14156ff6d951SJohn Birrell s = (char *)data_str->d_buf + rsym.st_name; 14166ff6d951SJohn Birrell 14176ff6d951SJohn Birrell if (strncmp(s, dt_prefix, sizeof (dt_prefix) - 1) != 0) 14186ff6d951SJohn Birrell continue; 14196ff6d951SJohn Birrell 14206ff6d951SJohn Birrell if (dt_symtab_lookup(data_sym, isym, rela.r_offset, 1421b08e2b04SJustin Hibbits shdr_rel.sh_info, &fsym, 1422b08e2b04SJustin Hibbits (emachine1 == EM_PPC64), elf) != 0) { 14236ff6d951SJohn Birrell dt_strtab_destroy(strtab); 14246ff6d951SJohn Birrell goto err; 14256ff6d951SJohn Birrell } 14266ff6d951SJohn Birrell 14276ff6d951SJohn Birrell if (GELF_ST_BIND(fsym.st_info) != STB_LOCAL) 14286ff6d951SJohn Birrell continue; 14296ff6d951SJohn Birrell 14306ff6d951SJohn Birrell if (fsym.st_name > data_str->d_size) { 14316ff6d951SJohn Birrell dt_strtab_destroy(strtab); 14326ff6d951SJohn Birrell goto err; 14336ff6d951SJohn Birrell } 14346ff6d951SJohn Birrell 14356ff6d951SJohn Birrell s = (char *)data_str->d_buf + fsym.st_name; 14366ff6d951SJohn Birrell 14376ff6d951SJohn Birrell /* 14386ff6d951SJohn Birrell * If this symbol isn't of type function, we've really 14396ff6d951SJohn Birrell * driven off the rails or the object file is corrupt. 14406ff6d951SJohn Birrell */ 14416ff6d951SJohn Birrell if (GELF_ST_TYPE(fsym.st_info) != STT_FUNC) { 14426ff6d951SJohn Birrell dt_strtab_destroy(strtab); 14436ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 14446ff6d951SJohn Birrell "expected %s to be of type function", s)); 14456ff6d951SJohn Birrell } 14466ff6d951SJohn Birrell 14476ff6d951SJohn Birrell len = snprintf(NULL, 0, dt_symfmt, dt_symprefix, 14486ff6d951SJohn Birrell objkey, s) + 1; 14496ff6d951SJohn Birrell if ((p = dt_alloc(dtp, len)) == NULL) { 14506ff6d951SJohn Birrell dt_strtab_destroy(strtab); 14516ff6d951SJohn Birrell goto err; 14526ff6d951SJohn Birrell } 14536ff6d951SJohn Birrell (void) snprintf(p, len, dt_symfmt, dt_symprefix, 14546ff6d951SJohn Birrell objkey, s); 14556ff6d951SJohn Birrell 14566ff6d951SJohn Birrell if (dt_strtab_index(strtab, p) == -1) { 14576ff6d951SJohn Birrell nsym++; 14586ff6d951SJohn Birrell (void) dt_strtab_insert(strtab, p); 14596ff6d951SJohn Birrell } 14606ff6d951SJohn Birrell 14616ff6d951SJohn Birrell dt_free(dtp, p); 14626ff6d951SJohn Birrell } 14636ff6d951SJohn Birrell 14646ff6d951SJohn Birrell /* 14656ff6d951SJohn Birrell * If needed, allocate the additional space for the symbol 14666ff6d951SJohn Birrell * table and string table copying the old data into the new 14676ff6d951SJohn Birrell * buffers, and marking the buffers as dirty. We inject those 14686ff6d951SJohn Birrell * newly allocated buffers into the libelf data structures, but 14696ff6d951SJohn Birrell * are still responsible for freeing them once we're done with 14706ff6d951SJohn Birrell * the elf handle. 14716ff6d951SJohn Birrell */ 14726ff6d951SJohn Birrell if (nsym > 0) { 14736ff6d951SJohn Birrell /* 14746ff6d951SJohn Birrell * The first byte of the string table is reserved for 14756ff6d951SJohn Birrell * the \0 entry. 14766ff6d951SJohn Birrell */ 14776ff6d951SJohn Birrell len = dt_strtab_size(strtab) - 1; 14786ff6d951SJohn Birrell 14796ff6d951SJohn Birrell assert(len > 0); 14806ff6d951SJohn Birrell assert(dt_strtab_index(strtab, "") == 0); 14816ff6d951SJohn Birrell 14826ff6d951SJohn Birrell dt_strtab_destroy(strtab); 14836ff6d951SJohn Birrell 14846ff6d951SJohn Birrell if ((pair = dt_alloc(dtp, sizeof (*pair))) == NULL) 14856ff6d951SJohn Birrell goto err; 14866ff6d951SJohn Birrell 14876ff6d951SJohn Birrell if ((pair->dlp_str = dt_alloc(dtp, data_str->d_size + 14886ff6d951SJohn Birrell len)) == NULL) { 14896ff6d951SJohn Birrell dt_free(dtp, pair); 14906ff6d951SJohn Birrell goto err; 14916ff6d951SJohn Birrell } 14926ff6d951SJohn Birrell 14936ff6d951SJohn Birrell if ((pair->dlp_sym = dt_alloc(dtp, data_sym->d_size + 14946ff6d951SJohn Birrell nsym * symsize)) == NULL) { 14956ff6d951SJohn Birrell dt_free(dtp, pair->dlp_str); 14966ff6d951SJohn Birrell dt_free(dtp, pair); 14976ff6d951SJohn Birrell goto err; 14986ff6d951SJohn Birrell } 14996ff6d951SJohn Birrell 15006ff6d951SJohn Birrell pair->dlp_next = bufs; 15016ff6d951SJohn Birrell bufs = pair; 15026ff6d951SJohn Birrell 15036ff6d951SJohn Birrell bcopy(data_str->d_buf, pair->dlp_str, data_str->d_size); 15046ff6d951SJohn Birrell data_str->d_buf = pair->dlp_str; 15056ff6d951SJohn Birrell data_str->d_size += len; 15066ff6d951SJohn Birrell (void) elf_flagdata(data_str, ELF_C_SET, ELF_F_DIRTY); 15076ff6d951SJohn Birrell 15086ff6d951SJohn Birrell shdr_str.sh_size += len; 15096ff6d951SJohn Birrell (void) gelf_update_shdr(scn_str, &shdr_str); 15106ff6d951SJohn Birrell 15116ff6d951SJohn Birrell bcopy(data_sym->d_buf, pair->dlp_sym, data_sym->d_size); 15126ff6d951SJohn Birrell data_sym->d_buf = pair->dlp_sym; 15136ff6d951SJohn Birrell data_sym->d_size += nsym * symsize; 15146ff6d951SJohn Birrell (void) elf_flagdata(data_sym, ELF_C_SET, ELF_F_DIRTY); 15156ff6d951SJohn Birrell 15166ff6d951SJohn Birrell shdr_sym.sh_size += nsym * symsize; 15176ff6d951SJohn Birrell (void) gelf_update_shdr(scn_sym, &shdr_sym); 15186ff6d951SJohn Birrell 15196ff6d951SJohn Birrell nsym += isym; 15206ff6d951SJohn Birrell } else { 15216ff6d951SJohn Birrell dt_strtab_destroy(strtab); 15226ff6d951SJohn Birrell } 15236ff6d951SJohn Birrell 15246ff6d951SJohn Birrell /* 15256ff6d951SJohn Birrell * Now that the tables have been allocated, perform the 15266ff6d951SJohn Birrell * modifications described above. 15276ff6d951SJohn Birrell */ 15286ff6d951SJohn Birrell for (i = 0; i < shdr_rel.sh_size / shdr_rel.sh_entsize; i++) { 15296ff6d951SJohn Birrell 15306ff6d951SJohn Birrell if (shdr_rel.sh_type == SHT_RELA) { 15316ff6d951SJohn Birrell if (gelf_getrela(data_rel, i, &rela) == NULL) 15326ff6d951SJohn Birrell continue; 15336ff6d951SJohn Birrell } else { 15346ff6d951SJohn Birrell GElf_Rel rel; 15356ff6d951SJohn Birrell if (gelf_getrel(data_rel, i, &rel) == NULL) 15366ff6d951SJohn Birrell continue; 15376ff6d951SJohn Birrell rela.r_offset = rel.r_offset; 15386ff6d951SJohn Birrell rela.r_info = rel.r_info; 15396ff6d951SJohn Birrell rela.r_addend = 0; 15406ff6d951SJohn Birrell } 15416ff6d951SJohn Birrell 15426ff6d951SJohn Birrell ndx = GELF_R_SYM(rela.r_info); 15436ff6d951SJohn Birrell 15446ff6d951SJohn Birrell if (gelf_getsym(data_sym, ndx, &rsym) == NULL || 15456ff6d951SJohn Birrell rsym.st_name > data_str->d_size) 15466ff6d951SJohn Birrell goto err; 15476ff6d951SJohn Birrell 15486ff6d951SJohn Birrell s = (char *)data_str->d_buf + rsym.st_name; 15496ff6d951SJohn Birrell 15506ff6d951SJohn Birrell if (strncmp(s, dt_prefix, sizeof (dt_prefix) - 1) != 0) 15516ff6d951SJohn Birrell continue; 15526ff6d951SJohn Birrell 15536ff6d951SJohn Birrell s += sizeof (dt_prefix) - 1; 15546ff6d951SJohn Birrell 15556ff6d951SJohn Birrell /* 15566ff6d951SJohn Birrell * Check to see if this is an 'is-enabled' check as 15576ff6d951SJohn Birrell * opposed to a normal probe. 15586ff6d951SJohn Birrell */ 15596ff6d951SJohn Birrell if (strncmp(s, dt_enabled, 15606ff6d951SJohn Birrell sizeof (dt_enabled) - 1) == 0) { 15616ff6d951SJohn Birrell s += sizeof (dt_enabled) - 1; 15626ff6d951SJohn Birrell eprobe = 1; 15636ff6d951SJohn Birrell *eprobesp = 1; 15646ff6d951SJohn Birrell dt_dprintf("is-enabled probe\n"); 15656ff6d951SJohn Birrell } else { 15666ff6d951SJohn Birrell eprobe = 0; 15676ff6d951SJohn Birrell dt_dprintf("normal probe\n"); 15686ff6d951SJohn Birrell } 15696ff6d951SJohn Birrell 15706ff6d951SJohn Birrell if (*s++ != '_') 15716ff6d951SJohn Birrell goto err; 15726ff6d951SJohn Birrell 15736ff6d951SJohn Birrell if ((p = strstr(s, "___")) == NULL || 15746ff6d951SJohn Birrell p - s >= sizeof (pname)) 15756ff6d951SJohn Birrell goto err; 15766ff6d951SJohn Birrell 15776ff6d951SJohn Birrell bcopy(s, pname, p - s); 15786ff6d951SJohn Birrell pname[p - s] = '\0'; 15796ff6d951SJohn Birrell 15806ff6d951SJohn Birrell if (dt_symtab_lookup(data_sym, isym, rela.r_offset, 1581b08e2b04SJustin Hibbits shdr_rel.sh_info, &fsym, 1582b08e2b04SJustin Hibbits (emachine1 == EM_PPC64), elf) != 0) 15836ff6d951SJohn Birrell goto err; 15846ff6d951SJohn Birrell 15856ff6d951SJohn Birrell if (fsym.st_name > data_str->d_size) 15866ff6d951SJohn Birrell goto err; 15876ff6d951SJohn Birrell 15886ff6d951SJohn Birrell assert(GELF_ST_TYPE(fsym.st_info) == STT_FUNC); 15896ff6d951SJohn Birrell 15906ff6d951SJohn Birrell /* 15916ff6d951SJohn Birrell * If a NULL relocation name is passed to 15926ff6d951SJohn Birrell * dt_probe_define(), the function name is used for the 15936ff6d951SJohn Birrell * relocation. The relocation needs to use a mangled 15946ff6d951SJohn Birrell * name if the symbol is locally scoped; the function 15956ff6d951SJohn Birrell * name may need to change if we've found the global 15966ff6d951SJohn Birrell * alias for the locally scoped symbol (we prefer 15976ff6d951SJohn Birrell * global symbols to locals in dt_symtab_lookup()). 15986ff6d951SJohn Birrell */ 15996ff6d951SJohn Birrell s = (char *)data_str->d_buf + fsym.st_name; 16006ff6d951SJohn Birrell r = NULL; 16016ff6d951SJohn Birrell 16026ff6d951SJohn Birrell if (GELF_ST_BIND(fsym.st_info) == STB_LOCAL) { 16036ff6d951SJohn Birrell dsym = fsym; 16046ff6d951SJohn Birrell dsym.st_name = istr; 16056ff6d951SJohn Birrell dsym.st_info = GELF_ST_INFO(STB_GLOBAL, 16066ff6d951SJohn Birrell STT_FUNC); 16076ff6d951SJohn Birrell dsym.st_other = 16086ff6d951SJohn Birrell ELF64_ST_VISIBILITY(STV_ELIMINATE); 16096ff6d951SJohn Birrell (void) gelf_update_sym(data_sym, isym, &dsym); 16106ff6d951SJohn Birrell 16116ff6d951SJohn Birrell r = (char *)data_str->d_buf + istr; 16126ff6d951SJohn Birrell istr += 1 + sprintf(r, dt_symfmt, 16136ff6d951SJohn Birrell dt_symprefix, objkey, s); 16146ff6d951SJohn Birrell isym++; 16156ff6d951SJohn Birrell assert(isym <= nsym); 16166ff6d951SJohn Birrell 16176ff6d951SJohn Birrell } else if (strncmp(s, dt_symprefix, 16186ff6d951SJohn Birrell strlen(dt_symprefix)) == 0) { 16196ff6d951SJohn Birrell r = s; 16206ff6d951SJohn Birrell if ((s = strchr(s, '.')) == NULL) 16216ff6d951SJohn Birrell goto err; 16226ff6d951SJohn Birrell s++; 16236ff6d951SJohn Birrell } 16246ff6d951SJohn Birrell 16256ff6d951SJohn Birrell if ((pvp = dt_provider_lookup(dtp, pname)) == NULL) { 16266ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 16276ff6d951SJohn Birrell "no such provider %s", pname)); 16286ff6d951SJohn Birrell } 16296ff6d951SJohn Birrell 16303a3e3279SMark Johnston if (strlcpy(probename, p + 3, sizeof (probename)) >= 16313a3e3279SMark Johnston sizeof (probename)) 16326ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 16333a3e3279SMark Johnston "invalid probe name %s", probename)); 16343a3e3279SMark Johnston (void) strhyphenate(probename); 16353a3e3279SMark Johnston if ((prp = dt_probe_lookup(pvp, probename)) == NULL) 16363a3e3279SMark Johnston return (dt_link_error(dtp, elf, fd, bufs, 16373a3e3279SMark Johnston "no such probe %s", probename)); 16386ff6d951SJohn Birrell 16396ff6d951SJohn Birrell assert(fsym.st_value <= rela.r_offset); 16406ff6d951SJohn Birrell 16416ff6d951SJohn Birrell off = rela.r_offset - fsym.st_value; 16426ff6d951SJohn Birrell if (dt_modtext(dtp, data_tgt->d_buf, eprobe, 16430f2bd1e8SRui Paulo &rela, &off) != 0) 16446ff6d951SJohn Birrell goto err; 16456ff6d951SJohn Birrell 16466ff6d951SJohn Birrell if (dt_probe_define(pvp, prp, s, r, off, eprobe) != 0) { 16476ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 16486ff6d951SJohn Birrell "failed to allocate space for probe")); 16496ff6d951SJohn Birrell } 1650bc96366cSSteven Hartland #ifndef illumos 16510f2bd1e8SRui Paulo /* 16520f2bd1e8SRui Paulo * Our linker doesn't understand the SUNW_IGNORE ndx and 16530f2bd1e8SRui Paulo * will try to use this relocation when we build the 16540f2bd1e8SRui Paulo * final executable. Since we are done processing this 16550f2bd1e8SRui Paulo * relocation, mark it as inexistant and let libelf 16560f2bd1e8SRui Paulo * remove it from the file. 16570f2bd1e8SRui Paulo * If this wasn't done, we would have garbage added to 16580f2bd1e8SRui Paulo * the executable file as the symbol is going to be 16590f2bd1e8SRui Paulo * change from UND to ABS. 16600f2bd1e8SRui Paulo */ 16612b374230SMark Johnston if (shdr_rel.sh_type == SHT_RELA) { 16620f2bd1e8SRui Paulo rela.r_offset = 0; 16630f2bd1e8SRui Paulo rela.r_info = 0; 16640f2bd1e8SRui Paulo rela.r_addend = 0; 16650f2bd1e8SRui Paulo (void) gelf_update_rela(data_rel, i, &rela); 16662b374230SMark Johnston } else { 16672b374230SMark Johnston GElf_Rel rel; 16682b374230SMark Johnston rel.r_offset = 0; 16692b374230SMark Johnston rel.r_info = 0; 16702b374230SMark Johnston (void) gelf_update_rel(data_rel, i, &rel); 16712b374230SMark Johnston } 16720f2bd1e8SRui Paulo #endif 16736ff6d951SJohn Birrell 16746ff6d951SJohn Birrell mod = 1; 16756ff6d951SJohn Birrell (void) elf_flagdata(data_tgt, ELF_C_SET, ELF_F_DIRTY); 16766ff6d951SJohn Birrell 16776ff6d951SJohn Birrell /* 16786ff6d951SJohn Birrell * This symbol may already have been marked to 16796ff6d951SJohn Birrell * be ignored by another relocation referencing 16806ff6d951SJohn Birrell * the same symbol or if this object file has 16816ff6d951SJohn Birrell * already been processed by an earlier link 16826ff6d951SJohn Birrell * invocation. 16836ff6d951SJohn Birrell */ 1684bc96366cSSteven Hartland #ifndef illumos 16850f2bd1e8SRui Paulo #define SHN_SUNW_IGNORE SHN_ABS 16860f2bd1e8SRui Paulo #endif 16876ff6d951SJohn Birrell if (rsym.st_shndx != SHN_SUNW_IGNORE) { 16886ff6d951SJohn Birrell rsym.st_shndx = SHN_SUNW_IGNORE; 16896ff6d951SJohn Birrell (void) gelf_update_sym(data_sym, ndx, &rsym); 16906ff6d951SJohn Birrell } 16916ff6d951SJohn Birrell } 16926ff6d951SJohn Birrell } 16936ff6d951SJohn Birrell 16946ff6d951SJohn Birrell if (mod && elf_update(elf, ELF_C_WRITE) == -1) 16956ff6d951SJohn Birrell goto err; 16966ff6d951SJohn Birrell 16976ff6d951SJohn Birrell (void) elf_end(elf); 16986ff6d951SJohn Birrell (void) close(fd); 16996ff6d951SJohn Birrell 1700bc96366cSSteven Hartland #ifndef illumos 17010f2bd1e8SRui Paulo if (nsym > 0) 17020f2bd1e8SRui Paulo #endif 17036ff6d951SJohn Birrell while ((pair = bufs) != NULL) { 17046ff6d951SJohn Birrell bufs = pair->dlp_next; 17056ff6d951SJohn Birrell dt_free(dtp, pair->dlp_str); 17066ff6d951SJohn Birrell dt_free(dtp, pair->dlp_sym); 17076ff6d951SJohn Birrell dt_free(dtp, pair); 17086ff6d951SJohn Birrell } 17096ff6d951SJohn Birrell 17106ff6d951SJohn Birrell return (0); 17116ff6d951SJohn Birrell 17126ff6d951SJohn Birrell err: 17136ff6d951SJohn Birrell return (dt_link_error(dtp, elf, fd, bufs, 17146ff6d951SJohn Birrell "an error was encountered while processing %s", obj)); 17156ff6d951SJohn Birrell } 17166ff6d951SJohn Birrell 17176ff6d951SJohn Birrell int 17186ff6d951SJohn Birrell dtrace_program_link(dtrace_hdl_t *dtp, dtrace_prog_t *pgp, uint_t dflags, 17196ff6d951SJohn Birrell const char *file, int objc, char *const objv[]) 17206ff6d951SJohn Birrell { 1721bc96366cSSteven Hartland #ifndef illumos 17222693feb4SJohn Birrell char tfile[PATH_MAX]; 17232693feb4SJohn Birrell #endif 17246ff6d951SJohn Birrell char drti[PATH_MAX]; 17256ff6d951SJohn Birrell dof_hdr_t *dof; 17266ff6d951SJohn Birrell int fd, status, i, cur; 17276ff6d951SJohn Birrell char *cmd, tmp; 17286ff6d951SJohn Birrell size_t len; 17296ff6d951SJohn Birrell int eprobes = 0, ret = 0; 17306ff6d951SJohn Birrell 1731bc96366cSSteven Hartland #ifndef illumos 173237c380fbSRui Paulo if (access(file, R_OK) == 0) { 173337c380fbSRui Paulo fprintf(stderr, "dtrace: target object (%s) already exists. " 173437c380fbSRui Paulo "Please remove the target\ndtrace: object and rebuild all " 173537c380fbSRui Paulo "the source objects if you wish to run the DTrace\n" 173637c380fbSRui Paulo "dtrace: linking process again\n", file); 173737c380fbSRui Paulo /* 173837c380fbSRui Paulo * Several build infrastructures run DTrace twice (e.g. 173937c380fbSRui Paulo * postgres) and we don't want the build to fail. Return 174037c380fbSRui Paulo * 0 here since this isn't really a fatal error. 174137c380fbSRui Paulo */ 174237c380fbSRui Paulo return (0); 174337c380fbSRui Paulo } 17442693feb4SJohn Birrell #endif 17452693feb4SJohn Birrell 17466ff6d951SJohn Birrell /* 17476ff6d951SJohn Birrell * A NULL program indicates a special use in which we just link 17486ff6d951SJohn Birrell * together a bunch of object files specified in objv and then 17496ff6d951SJohn Birrell * unlink(2) those object files. 17506ff6d951SJohn Birrell */ 17516ff6d951SJohn Birrell if (pgp == NULL) { 17526ff6d951SJohn Birrell const char *fmt = "%s -o %s -r"; 17536ff6d951SJohn Birrell 17546ff6d951SJohn Birrell len = snprintf(&tmp, 1, fmt, dtp->dt_ld_path, file) + 1; 17556ff6d951SJohn Birrell 17566ff6d951SJohn Birrell for (i = 0; i < objc; i++) 17576ff6d951SJohn Birrell len += strlen(objv[i]) + 1; 17586ff6d951SJohn Birrell 17596ff6d951SJohn Birrell cmd = alloca(len); 17606ff6d951SJohn Birrell 17616ff6d951SJohn Birrell cur = snprintf(cmd, len, fmt, dtp->dt_ld_path, file); 17626ff6d951SJohn Birrell 17636ff6d951SJohn Birrell for (i = 0; i < objc; i++) 17646ff6d951SJohn Birrell cur += snprintf(cmd + cur, len - cur, " %s", objv[i]); 17656ff6d951SJohn Birrell 17666ff6d951SJohn Birrell if ((status = system(cmd)) == -1) { 17676ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 17686ff6d951SJohn Birrell "failed to run %s: %s", dtp->dt_ld_path, 17696ff6d951SJohn Birrell strerror(errno))); 17706ff6d951SJohn Birrell } 17716ff6d951SJohn Birrell 17726ff6d951SJohn Birrell if (WIFSIGNALED(status)) { 17736ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 17746ff6d951SJohn Birrell "failed to link %s: %s failed due to signal %d", 17756ff6d951SJohn Birrell file, dtp->dt_ld_path, WTERMSIG(status))); 17766ff6d951SJohn Birrell } 17776ff6d951SJohn Birrell 17786ff6d951SJohn Birrell if (WEXITSTATUS(status) != 0) { 17796ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 17806ff6d951SJohn Birrell "failed to link %s: %s exited with status %d\n", 17816ff6d951SJohn Birrell file, dtp->dt_ld_path, WEXITSTATUS(status))); 17826ff6d951SJohn Birrell } 17836ff6d951SJohn Birrell 17846ff6d951SJohn Birrell for (i = 0; i < objc; i++) { 17856ff6d951SJohn Birrell if (strcmp(objv[i], file) != 0) 17866ff6d951SJohn Birrell (void) unlink(objv[i]); 17876ff6d951SJohn Birrell } 17886ff6d951SJohn Birrell 17896ff6d951SJohn Birrell return (0); 17906ff6d951SJohn Birrell } 17916ff6d951SJohn Birrell 17926ff6d951SJohn Birrell for (i = 0; i < objc; i++) { 17936ff6d951SJohn Birrell if (process_obj(dtp, objv[i], &eprobes) != 0) 17946ff6d951SJohn Birrell return (-1); /* errno is set for us */ 17956ff6d951SJohn Birrell } 17966ff6d951SJohn Birrell 17976ff6d951SJohn Birrell /* 17986ff6d951SJohn Birrell * If there are is-enabled probes then we need to force use of DOF 17996ff6d951SJohn Birrell * version 2. 18006ff6d951SJohn Birrell */ 18016ff6d951SJohn Birrell if (eprobes && pgp->dp_dofversion < DOF_VERSION_2) 18026ff6d951SJohn Birrell pgp->dp_dofversion = DOF_VERSION_2; 18036ff6d951SJohn Birrell 18046ff6d951SJohn Birrell if ((dof = dtrace_dof_create(dtp, pgp, dflags)) == NULL) 18056ff6d951SJohn Birrell return (-1); /* errno is set for us */ 18066ff6d951SJohn Birrell 1807bc96366cSSteven Hartland #ifdef illumos 18086ff6d951SJohn Birrell /* 18096ff6d951SJohn Birrell * Create a temporary file and then unlink it if we're going to 18106ff6d951SJohn Birrell * combine it with drti.o later. We can still refer to it in child 18116ff6d951SJohn Birrell * processes as /dev/fd/<fd>. 18126ff6d951SJohn Birrell */ 18136ff6d951SJohn Birrell if ((fd = open64(file, O_RDWR | O_CREAT | O_TRUNC, 0666)) == -1) { 18146ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 18156ff6d951SJohn Birrell "failed to open %s: %s", file, strerror(errno))); 18166ff6d951SJohn Birrell } 18172693feb4SJohn Birrell #else 181833d84250SMark Johnston snprintf(tfile, sizeof(tfile), "%s.XXXXXX", file); 1819ed09cc1bSMark Johnston if ((fd = mkostemp(tfile, O_CLOEXEC)) == -1) 18202693feb4SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 182133d84250SMark Johnston "failed to create temporary file %s: %s", 182233d84250SMark Johnston tfile, strerror(errno))); 18232693feb4SJohn Birrell #endif 18246ff6d951SJohn Birrell 18256ff6d951SJohn Birrell /* 18266ff6d951SJohn Birrell * If -xlinktype=DOF has been selected, just write out the DOF. 18276ff6d951SJohn Birrell * Otherwise proceed to the default of generating and linking ELF. 18286ff6d951SJohn Birrell */ 18296ff6d951SJohn Birrell switch (dtp->dt_linktype) { 18306ff6d951SJohn Birrell case DT_LTYP_DOF: 18316ff6d951SJohn Birrell if (dt_write(dtp, fd, dof, dof->dofh_filesz) < dof->dofh_filesz) 18326ff6d951SJohn Birrell ret = errno; 18336ff6d951SJohn Birrell 18346ff6d951SJohn Birrell if (close(fd) != 0 && ret == 0) 18356ff6d951SJohn Birrell ret = errno; 18366ff6d951SJohn Birrell 18376ff6d951SJohn Birrell if (ret != 0) { 18386ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 18396ff6d951SJohn Birrell "failed to write %s: %s", file, strerror(ret))); 18406ff6d951SJohn Birrell } 18416ff6d951SJohn Birrell 18426ff6d951SJohn Birrell return (0); 18436ff6d951SJohn Birrell 18446ff6d951SJohn Birrell case DT_LTYP_ELF: 18456ff6d951SJohn Birrell break; /* fall through to the rest of dtrace_program_link() */ 18466ff6d951SJohn Birrell 18476ff6d951SJohn Birrell default: 18486ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 18496ff6d951SJohn Birrell "invalid link type %u\n", dtp->dt_linktype)); 18506ff6d951SJohn Birrell } 18516ff6d951SJohn Birrell 18526ff6d951SJohn Birrell 1853bc96366cSSteven Hartland #ifdef illumos 18546ff6d951SJohn Birrell if (!dtp->dt_lazyload) 18556ff6d951SJohn Birrell (void) unlink(file); 18562693feb4SJohn Birrell #endif 18576ff6d951SJohn Birrell 18586ff6d951SJohn Birrell if (dtp->dt_oflags & DTRACE_O_LP64) 18596ff6d951SJohn Birrell status = dump_elf64(dtp, dof, fd); 18606ff6d951SJohn Birrell else 18616ff6d951SJohn Birrell status = dump_elf32(dtp, dof, fd); 18626ff6d951SJohn Birrell 1863bc96366cSSteven Hartland #ifdef illumos 18646ff6d951SJohn Birrell if (status != 0 || lseek(fd, 0, SEEK_SET) != 0) { 18656ff6d951SJohn Birrell return (dt_link_error(dtp, NULL, -1, NULL, 18666ff6d951SJohn Birrell "failed to write %s: %s", file, strerror(errno))); 18676ff6d951SJohn Birrell } 186833d84250SMark Johnston #else 18698caf8a8dSMark Johnston if (status != 0) 187033d84250SMark Johnston return (dt_link_error(dtp, NULL, -1, NULL, 18718caf8a8dSMark Johnston "failed to write %s: %s", tfile, 18728caf8a8dSMark Johnston strerror(dtrace_errno(dtp)))); 187333d84250SMark Johnston #endif 18746ff6d951SJohn Birrell 18756ff6d951SJohn Birrell if (!dtp->dt_lazyload) { 1876bc96366cSSteven Hartland #ifdef illumos 18776ff6d951SJohn Birrell const char *fmt = "%s -o %s -r -Blocal -Breduce /dev/fd/%d %s"; 18786ff6d951SJohn Birrell 18796ff6d951SJohn Birrell if (dtp->dt_oflags & DTRACE_O_LP64) { 18806ff6d951SJohn Birrell (void) snprintf(drti, sizeof (drti), 18816ff6d951SJohn Birrell "%s/64/drti.o", _dtrace_libdir); 18826ff6d951SJohn Birrell } else { 18836ff6d951SJohn Birrell (void) snprintf(drti, sizeof (drti), 18846ff6d951SJohn Birrell "%s/drti.o", _dtrace_libdir); 18856ff6d951SJohn Birrell } 18866ff6d951SJohn Birrell 18876ff6d951SJohn Birrell len = snprintf(&tmp, 1, fmt, dtp->dt_ld_path, file, fd, 18886ff6d951SJohn Birrell drti) + 1; 18896ff6d951SJohn Birrell 18906ff6d951SJohn Birrell cmd = alloca(len); 18916ff6d951SJohn Birrell 18926ff6d951SJohn Birrell (void) snprintf(cmd, len, fmt, dtp->dt_ld_path, file, fd, drti); 18932693feb4SJohn Birrell #else 18948caf8a8dSMark Johnston const char *fmt = "%s -o %s -r %s %s"; 18950fff3baaSMark Johnston dt_dirpath_t *dp = dt_list_next(&dtp->dt_lib_path); 18962693feb4SJohn Birrell 18970fff3baaSMark Johnston (void) snprintf(drti, sizeof (drti), "%s/drti.o", dp->dir_path); 18982693feb4SJohn Birrell 18992693feb4SJohn Birrell len = snprintf(&tmp, 1, fmt, dtp->dt_ld_path, file, tfile, 19002693feb4SJohn Birrell drti) + 1; 19012693feb4SJohn Birrell 19022693feb4SJohn Birrell cmd = alloca(len); 19032693feb4SJohn Birrell 19048caf8a8dSMark Johnston (void) snprintf(cmd, len, fmt, dtp->dt_ld_path, file, tfile, 19050f2bd1e8SRui Paulo drti); 19062693feb4SJohn Birrell #endif 19076ff6d951SJohn Birrell if ((status = system(cmd)) == -1) { 190803a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 19096ff6d951SJohn Birrell "failed to run %s: %s", dtp->dt_ld_path, 19106ff6d951SJohn Birrell strerror(errno)); 19116ff6d951SJohn Birrell goto done; 19126ff6d951SJohn Birrell } 19136ff6d951SJohn Birrell 19146ff6d951SJohn Birrell if (WIFSIGNALED(status)) { 191503a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 19166ff6d951SJohn Birrell "failed to link %s: %s failed due to signal %d", 19176ff6d951SJohn Birrell file, dtp->dt_ld_path, WTERMSIG(status)); 19186ff6d951SJohn Birrell goto done; 19196ff6d951SJohn Birrell } 19206ff6d951SJohn Birrell 19216ff6d951SJohn Birrell if (WEXITSTATUS(status) != 0) { 192203a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 19236ff6d951SJohn Birrell "failed to link %s: %s exited with status %d\n", 19246ff6d951SJohn Birrell file, dtp->dt_ld_path, WEXITSTATUS(status)); 19256ff6d951SJohn Birrell goto done; 19266ff6d951SJohn Birrell } 19270f2bd1e8SRui Paulo (void) close(fd); /* release temporary file */ 192803a5f9f0SMark Johnston 192903a5f9f0SMark Johnston #ifdef __FreeBSD__ 193003a5f9f0SMark Johnston /* 193103a5f9f0SMark Johnston * Now that we've linked drti.o, reduce the global __SUNW_dof 193203a5f9f0SMark Johnston * symbol to a local symbol. This is needed to so that multiple 193303a5f9f0SMark Johnston * generated object files (for different providers, for 193403a5f9f0SMark Johnston * instance) can be linked together. This is accomplished using 193503a5f9f0SMark Johnston * the -Blocal flag with Sun's linker, but GNU ld doesn't appear 193603a5f9f0SMark Johnston * to have an equivalent option. 193703a5f9f0SMark Johnston */ 193803a5f9f0SMark Johnston asprintf(&cmd, "%s --localize-hidden %s", dtp->dt_objcopy_path, 193903a5f9f0SMark Johnston file); 194003a5f9f0SMark Johnston if ((status = system(cmd)) == -1) { 194103a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, -1, NULL, 194203a5f9f0SMark Johnston "failed to run %s: %s", dtp->dt_objcopy_path, 194303a5f9f0SMark Johnston strerror(errno)); 194403a5f9f0SMark Johnston free(cmd); 194503a5f9f0SMark Johnston goto done; 194603a5f9f0SMark Johnston } 194703a5f9f0SMark Johnston free(cmd); 194803a5f9f0SMark Johnston 194903a5f9f0SMark Johnston if (WIFSIGNALED(status)) { 195003a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, -1, NULL, 195103a5f9f0SMark Johnston "failed to link %s: %s failed due to signal %d", 195203a5f9f0SMark Johnston file, dtp->dt_objcopy_path, WTERMSIG(status)); 195303a5f9f0SMark Johnston goto done; 195403a5f9f0SMark Johnston } 195503a5f9f0SMark Johnston 195603a5f9f0SMark Johnston if (WEXITSTATUS(status) != 0) { 195703a5f9f0SMark Johnston ret = dt_link_error(dtp, NULL, -1, NULL, 195803a5f9f0SMark Johnston "failed to link %s: %s exited with status %d\n", 195903a5f9f0SMark Johnston file, dtp->dt_objcopy_path, WEXITSTATUS(status)); 196003a5f9f0SMark Johnston goto done; 196103a5f9f0SMark Johnston } 196203a5f9f0SMark Johnston #endif 19636ff6d951SJohn Birrell } else { 1964ed09cc1bSMark Johnston #ifdef __FreeBSD__ 1965ed09cc1bSMark Johnston if (rename(tfile, file) != 0) { 1966ed09cc1bSMark Johnston ret = dt_link_error(dtp, NULL, fd, NULL, 1967ed09cc1bSMark Johnston "failed to rename %s to %s: %s", tfile, file, 1968ed09cc1bSMark Johnston strerror(errno)); 1969ed09cc1bSMark Johnston goto done; 1970ed09cc1bSMark Johnston } 1971ed09cc1bSMark Johnston #endif 19726ff6d951SJohn Birrell (void) close(fd); 19736ff6d951SJohn Birrell } 19746ff6d951SJohn Birrell 19756ff6d951SJohn Birrell done: 19766ff6d951SJohn Birrell dtrace_dof_destroy(dtp, dof); 19772693feb4SJohn Birrell 19786bd8f7eeSMark Johnston #ifdef __FreeBSD__ 1979ed09cc1bSMark Johnston if (!dtp->dt_lazyload) 1980ed09cc1bSMark Johnston (void) unlink(tfile); 19812693feb4SJohn Birrell #endif 19826ff6d951SJohn Birrell return (ret); 19836ff6d951SJohn Birrell } 1984