load_elf_obj.c revision 210423
1134459Siedowse/*- 2134459Siedowse * Copyright (c) 2004 Ian Dowse <iedowse@freebsd.org> 3134459Siedowse * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 4134459Siedowse * Copyright (c) 1998 Peter Wemm <peter@freebsd.org> 5134459Siedowse * All rights reserved. 6134459Siedowse * 7134459Siedowse * Redistribution and use in source and binary forms, with or without 8134459Siedowse * modification, are permitted provided that the following conditions 9134459Siedowse * are met: 10134459Siedowse * 1. Redistributions of source code must retain the above copyright 11134459Siedowse * notice, this list of conditions and the following disclaimer. 12134459Siedowse * 2. Redistributions in binary form must reproduce the above copyright 13134459Siedowse * notice, this list of conditions and the following disclaimer in the 14134459Siedowse * documentation and/or other materials provided with the distribution. 15134459Siedowse * 16134459Siedowse * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17134459Siedowse * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18134459Siedowse * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19134459Siedowse * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20134459Siedowse * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21134459Siedowse * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22134459Siedowse * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23134459Siedowse * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24134459Siedowse * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25134459Siedowse * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26134459Siedowse * SUCH DAMAGE. 27134459Siedowse */ 28134459Siedowse 29134459Siedowse#include <sys/cdefs.h> 30134459Siedowse__FBSDID("$FreeBSD: head/sys/boot/common/load_elf_obj.c 210423 2010-07-23 17:07:51Z avg $"); 31134459Siedowse 32134459Siedowse#include <sys/param.h> 33134459Siedowse#include <sys/exec.h> 34134459Siedowse#include <sys/linker.h> 35134459Siedowse#include <sys/module.h> 36134459Siedowse#include <inttypes.h> 37134459Siedowse#include <string.h> 38134459Siedowse#include <machine/elf.h> 39134459Siedowse#include <stand.h> 40134459Siedowse#define FREEBSD_ELF 41134459Siedowse#include <link.h> 42134459Siedowse 43134459Siedowse#include "bootstrap.h" 44134459Siedowse 45134459Siedowse#define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l) 46134459Siedowse 47134459Siedowse#if defined(__i386__) && __ELF_WORD_SIZE == 64 48134459Siedowse#undef ELF_TARG_CLASS 49134459Siedowse#undef ELF_TARG_MACH 50134459Siedowse#define ELF_TARG_CLASS ELFCLASS64 51134459Siedowse#define ELF_TARG_MACH EM_X86_64 52134459Siedowse#endif 53134459Siedowse 54134459Siedowsetypedef struct elf_file { 55134459Siedowse Elf_Ehdr hdr; 56134459Siedowse Elf_Shdr *e_shdr; 57134459Siedowse 58134459Siedowse int symtabindex; /* Index of symbol table */ 59134459Siedowse int shstrindex; /* Index of section name string table */ 60134459Siedowse 61134459Siedowse int fd; 62134459Siedowse vm_offset_t off; 63134459Siedowse} *elf_file_t; 64134459Siedowse 65134459Siedowsestatic int __elfN(obj_loadimage)(struct preloaded_file *mp, elf_file_t ef, 66134459Siedowse u_int64_t loadaddr); 67134459Siedowsestatic int __elfN(obj_lookup_set)(struct preloaded_file *mp, elf_file_t ef, 68134459Siedowse const char *name, Elf_Addr *startp, Elf_Addr *stopp, int *countp); 69134459Siedowsestatic int __elfN(obj_reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, 70134459Siedowse Elf_Addr p, void *val, size_t len); 71134459Siedowsestatic int __elfN(obj_parse_modmetadata)(struct preloaded_file *mp, 72134459Siedowse elf_file_t ef); 73153504Smarcelstatic Elf_Addr __elfN(obj_symaddr)(struct elf_file *ef, Elf_Size symidx); 74134459Siedowse 75134459Siedowseconst char *__elfN(obj_kerneltype) = "elf kernel"; 76134459Siedowseconst char *__elfN(obj_moduletype) = "elf obj module"; 77134459Siedowse 78134459Siedowse/* 79134459Siedowse * Attempt to load the file (file) as an ELF module. It will be stored at 80134459Siedowse * (dest), and a pointer to a module structure describing the loaded object 81134459Siedowse * will be saved in (result). 82134459Siedowse */ 83134459Siedowseint 84134459Siedowse__elfN(obj_loadfile)(char *filename, u_int64_t dest, 85134459Siedowse struct preloaded_file **result) 86134459Siedowse{ 87134459Siedowse struct preloaded_file *fp, *kfp; 88134459Siedowse struct elf_file ef; 89134459Siedowse Elf_Ehdr *hdr; 90134459Siedowse int err; 91134459Siedowse ssize_t bytes_read; 92134459Siedowse 93134459Siedowse fp = NULL; 94134459Siedowse bzero(&ef, sizeof(struct elf_file)); 95134459Siedowse 96134459Siedowse /* 97134459Siedowse * Open the image, read and validate the ELF header 98134459Siedowse */ 99134459Siedowse if (filename == NULL) /* can't handle nameless */ 100134459Siedowse return(EFTYPE); 101134459Siedowse if ((ef.fd = open(filename, O_RDONLY)) == -1) 102134459Siedowse return(errno); 103134459Siedowse 104134459Siedowse hdr = &ef.hdr; 105134459Siedowse bytes_read = read(ef.fd, hdr, sizeof(*hdr)); 106134459Siedowse if (bytes_read != sizeof(*hdr)) { 107134459Siedowse err = EFTYPE; /* could be EIO, but may be small file */ 108134459Siedowse goto oerr; 109134459Siedowse } 110134459Siedowse 111134459Siedowse /* Is it ELF? */ 112134459Siedowse if (!IS_ELF(*hdr)) { 113134459Siedowse err = EFTYPE; 114134459Siedowse goto oerr; 115134459Siedowse } 116134459Siedowse if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */ 117134459Siedowse hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 118134459Siedowse hdr->e_ident[EI_VERSION] != EV_CURRENT || /* Version ? */ 119134459Siedowse hdr->e_version != EV_CURRENT || 120134459Siedowse hdr->e_machine != ELF_TARG_MACH || /* Machine ? */ 121134459Siedowse hdr->e_type != ET_REL) { 122134459Siedowse err = EFTYPE; 123134459Siedowse goto oerr; 124134459Siedowse } 125134459Siedowse 126134459Siedowse if (hdr->e_shnum * hdr->e_shentsize == 0 || hdr->e_shoff == 0 || 127134459Siedowse hdr->e_shentsize != sizeof(Elf_Shdr)) { 128134459Siedowse err = EFTYPE; 129134459Siedowse goto oerr; 130134459Siedowse } 131134459Siedowse 132134459Siedowse kfp = file_findfile(NULL, NULL); 133134459Siedowse if (kfp == NULL) { 134134459Siedowse printf("elf" __XSTRING(__ELF_WORD_SIZE) 135134459Siedowse "_obj_loadfile: can't load module before kernel\n"); 136134459Siedowse err = EPERM; 137134459Siedowse goto oerr; 138134459Siedowse } 139134459Siedowse if (strcmp(__elfN(obj_kerneltype), kfp->f_type)) { 140134459Siedowse printf("elf" __XSTRING(__ELF_WORD_SIZE) 141134459Siedowse "_obj_loadfile: can't load module with kernel type '%s'\n", 142134459Siedowse kfp->f_type); 143134459Siedowse err = EPERM; 144134459Siedowse goto oerr; 145134459Siedowse } 146134459Siedowse 147134459Siedowse /* Page-align the load address */ 148134459Siedowse dest = roundup(dest, PAGE_SIZE); 149134459Siedowse 150134459Siedowse /* 151134459Siedowse * Ok, we think we should handle this. 152134459Siedowse */ 153134459Siedowse fp = file_alloc(); 154134459Siedowse if (fp == NULL) { 155134459Siedowse printf("elf" __XSTRING(__ELF_WORD_SIZE) 156134459Siedowse "_obj_loadfile: cannot allocate module info\n"); 157134459Siedowse err = EPERM; 158134459Siedowse goto out; 159134459Siedowse } 160134459Siedowse fp->f_name = strdup(filename); 161134459Siedowse fp->f_type = strdup(__elfN(obj_moduletype)); 162134459Siedowse 163134459Siedowse printf("%s ", filename); 164134459Siedowse 165134459Siedowse fp->f_size = __elfN(obj_loadimage)(fp, &ef, dest); 166134459Siedowse if (fp->f_size == 0 || fp->f_addr == 0) 167134459Siedowse goto ioerr; 168134459Siedowse 169134459Siedowse /* save exec header as metadata */ 170134459Siedowse file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*hdr), hdr); 171134459Siedowse 172134459Siedowse /* Load OK, return module pointer */ 173134459Siedowse *result = (struct preloaded_file *)fp; 174134459Siedowse err = 0; 175134459Siedowse goto out; 176134459Siedowse 177134459Siedowseioerr: 178134459Siedowse err = EIO; 179134459Siedowseoerr: 180134459Siedowse file_discard(fp); 181134459Siedowseout: 182134459Siedowse close(ef.fd); 183134459Siedowse if (ef.e_shdr != NULL) 184134459Siedowse free(ef.e_shdr); 185134459Siedowse 186134459Siedowse return(err); 187134459Siedowse} 188134459Siedowse 189134459Siedowse/* 190134459Siedowse * With the file (fd) open on the image, and (ehdr) containing 191134459Siedowse * the Elf header, load the image at (off) 192134459Siedowse */ 193134459Siedowsestatic int 194134459Siedowse__elfN(obj_loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off) 195134459Siedowse{ 196134459Siedowse Elf_Ehdr *hdr; 197134459Siedowse Elf_Shdr *shdr; 198134459Siedowse vm_offset_t firstaddr, lastaddr; 199134459Siedowse int i, nsym, res, ret, shdrbytes, symstrindex; 200134459Siedowse 201134459Siedowse ret = 0; 202134459Siedowse firstaddr = lastaddr = (vm_offset_t)off; 203134459Siedowse hdr = &ef->hdr; 204134459Siedowse ef->off = (vm_offset_t)off; 205134459Siedowse 206134459Siedowse /* Read in the section headers. */ 207134459Siedowse shdrbytes = hdr->e_shnum * hdr->e_shentsize; 208134459Siedowse shdr = alloc_pread(ef->fd, (off_t)hdr->e_shoff, shdrbytes); 209134459Siedowse if (shdr == NULL) { 210134459Siedowse printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 211134459Siedowse "_obj_loadimage: read section headers failed\n"); 212134459Siedowse goto out; 213134459Siedowse } 214134459Siedowse ef->e_shdr = shdr; 215134459Siedowse 216134459Siedowse /* 217134459Siedowse * Decide where to load everything, but don't read it yet. 218134459Siedowse * We store the load address as a non-zero sh_addr value. 219134459Siedowse * Start with the code/data and bss. 220134459Siedowse */ 221134459Siedowse for (i = 0; i < hdr->e_shnum; i++) 222134459Siedowse shdr[i].sh_addr = 0; 223134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 224210423Savg if (shdr[i].sh_size == 0) 225210423Savg continue; 226134459Siedowse switch (shdr[i].sh_type) { 227134459Siedowse case SHT_PROGBITS: 228134459Siedowse case SHT_NOBITS: 229134459Siedowse lastaddr = roundup(lastaddr, shdr[i].sh_addralign); 230134459Siedowse shdr[i].sh_addr = (Elf_Addr)lastaddr; 231134459Siedowse lastaddr += shdr[i].sh_size; 232134459Siedowse break; 233134459Siedowse } 234134459Siedowse } 235134459Siedowse 236134459Siedowse /* Symbols. */ 237134459Siedowse nsym = 0; 238134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 239134459Siedowse switch (shdr[i].sh_type) { 240134459Siedowse case SHT_SYMTAB: 241134459Siedowse nsym++; 242134459Siedowse ef->symtabindex = i; 243134459Siedowse shdr[i].sh_addr = (Elf_Addr)lastaddr; 244134459Siedowse lastaddr += shdr[i].sh_size; 245134459Siedowse break; 246134459Siedowse } 247134459Siedowse } 248134459Siedowse if (nsym != 1) { 249134459Siedowse printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 250134459Siedowse "_obj_loadimage: file has no valid symbol table\n"); 251134459Siedowse goto out; 252134459Siedowse } 253134459Siedowse lastaddr = roundup(lastaddr, shdr[ef->symtabindex].sh_addralign); 254134459Siedowse shdr[ef->symtabindex].sh_addr = (Elf_Addr)lastaddr; 255134459Siedowse lastaddr += shdr[ef->symtabindex].sh_size; 256134459Siedowse 257134459Siedowse symstrindex = shdr[ef->symtabindex].sh_link; 258134459Siedowse if (symstrindex < 0 || symstrindex >= hdr->e_shnum || 259134459Siedowse shdr[symstrindex].sh_type != SHT_STRTAB) { 260134459Siedowse printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 261134459Siedowse "_obj_loadimage: file has invalid symbol strings\n"); 262134459Siedowse goto out; 263134459Siedowse } 264134459Siedowse lastaddr = roundup(lastaddr, shdr[symstrindex].sh_addralign); 265134459Siedowse shdr[symstrindex].sh_addr = (Elf_Addr)lastaddr; 266134459Siedowse lastaddr += shdr[symstrindex].sh_size; 267134459Siedowse 268134459Siedowse /* Section names. */ 269134459Siedowse if (hdr->e_shstrndx == 0 || hdr->e_shstrndx >= hdr->e_shnum || 270134459Siedowse shdr[hdr->e_shstrndx].sh_type != SHT_STRTAB) { 271134459Siedowse printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 272134459Siedowse "_obj_loadimage: file has no section names\n"); 273134459Siedowse goto out; 274134459Siedowse } 275134459Siedowse ef->shstrindex = hdr->e_shstrndx; 276134459Siedowse lastaddr = roundup(lastaddr, shdr[ef->shstrindex].sh_addralign); 277134459Siedowse shdr[ef->shstrindex].sh_addr = (Elf_Addr)lastaddr; 278134459Siedowse lastaddr += shdr[ef->shstrindex].sh_size; 279134459Siedowse 280134459Siedowse /* Relocation tables. */ 281134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 282134459Siedowse switch (shdr[i].sh_type) { 283134459Siedowse case SHT_REL: 284134459Siedowse case SHT_RELA: 285134459Siedowse lastaddr = roundup(lastaddr, shdr[i].sh_addralign); 286134459Siedowse shdr[i].sh_addr = (Elf_Addr)lastaddr; 287134459Siedowse lastaddr += shdr[i].sh_size; 288134459Siedowse break; 289134459Siedowse } 290134459Siedowse } 291134459Siedowse 292134459Siedowse /* Clear the whole area, including bss regions. */ 293134459Siedowse kern_bzero(firstaddr, lastaddr - firstaddr); 294134459Siedowse 295134459Siedowse /* Now read it all in. */ 296134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 297134459Siedowse if (shdr[i].sh_addr == 0 || shdr[i].sh_type == SHT_NOBITS) 298134459Siedowse continue; 299134459Siedowse if (kern_pread(ef->fd, (vm_offset_t)shdr[i].sh_addr, 300134459Siedowse shdr[i].sh_size, (off_t)shdr[i].sh_offset) != 0) { 301134459Siedowse printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 302134459Siedowse "_obj_loadimage: read failed\n"); 303134459Siedowse goto out; 304134459Siedowse } 305134459Siedowse } 306134459Siedowse 307134459Siedowse file_addmetadata(fp, MODINFOMD_SHDR, shdrbytes, shdr); 308134459Siedowse 309134459Siedowse res = __elfN(obj_parse_modmetadata)(fp, ef); 310134459Siedowse if (res != 0) 311134459Siedowse goto out; 312134459Siedowse 313134459Siedowse ret = lastaddr - firstaddr; 314134459Siedowse fp->f_addr = firstaddr; 315134459Siedowse 316134459Siedowse printf("size 0x%lx at 0x%lx", (u_long)ret, (u_long)firstaddr); 317134459Siedowse 318134459Siedowseout: 319134459Siedowse printf("\n"); 320134459Siedowse return ret; 321134459Siedowse} 322134459Siedowse 323134459Siedowse#if defined(__i386__) && __ELF_WORD_SIZE == 64 324134459Siedowsestruct mod_metadata64 { 325134459Siedowse int md_version; /* structure version MDTV_* */ 326134459Siedowse int md_type; /* type of entry MDT_* */ 327134459Siedowse u_int64_t md_data; /* specific data */ 328134459Siedowse u_int64_t md_cval; /* common string label */ 329134459Siedowse}; 330134459Siedowse#endif 331134459Siedowse 332134459Siedowseint 333134459Siedowse__elfN(obj_parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef) 334134459Siedowse{ 335134459Siedowse struct mod_metadata md; 336134459Siedowse#if defined(__i386__) && __ELF_WORD_SIZE == 64 337134459Siedowse struct mod_metadata64 md64; 338134459Siedowse#endif 339134459Siedowse struct mod_depend *mdepend; 340134459Siedowse struct mod_version mver; 341134459Siedowse char *s; 342134459Siedowse int error, modcnt, minfolen; 343134459Siedowse Elf_Addr v, p, p_stop; 344134459Siedowse 345134459Siedowse if (__elfN(obj_lookup_set)(fp, ef, "modmetadata_set", &p, &p_stop, 346134459Siedowse &modcnt) != 0) 347134459Siedowse return ENOENT; 348134459Siedowse 349134459Siedowse modcnt = 0; 350134459Siedowse while (p < p_stop) { 351134459Siedowse COPYOUT(p, &v, sizeof(v)); 352134459Siedowse error = __elfN(obj_reloc_ptr)(fp, ef, p, &v, sizeof(v)); 353134459Siedowse if (error != 0) 354134459Siedowse return (error); 355134459Siedowse#if defined(__i386__) && __ELF_WORD_SIZE == 64 356134459Siedowse COPYOUT(v, &md64, sizeof(md64)); 357134459Siedowse error = __elfN(obj_reloc_ptr)(fp, ef, v, &md64, sizeof(md64)); 358134459Siedowse if (error != 0) 359134459Siedowse return (error); 360134459Siedowse md.md_version = md64.md_version; 361134459Siedowse md.md_type = md64.md_type; 362134459Siedowse md.md_cval = (const char *)(uintptr_t)md64.md_cval; 363134459Siedowse md.md_data = (void *)(uintptr_t)md64.md_data; 364134459Siedowse#else 365134459Siedowse COPYOUT(v, &md, sizeof(md)); 366134459Siedowse error = __elfN(obj_reloc_ptr)(fp, ef, v, &md, sizeof(md)); 367134459Siedowse if (error != 0) 368134459Siedowse return (error); 369134459Siedowse#endif 370134459Siedowse p += sizeof(Elf_Addr); 371134459Siedowse switch(md.md_type) { 372134459Siedowse case MDT_DEPEND: 373134459Siedowse s = strdupout((vm_offset_t)md.md_cval); 374134459Siedowse minfolen = sizeof(*mdepend) + strlen(s) + 1; 375134459Siedowse mdepend = malloc(minfolen); 376134459Siedowse if (mdepend == NULL) 377134459Siedowse return ENOMEM; 378134459Siedowse COPYOUT((vm_offset_t)md.md_data, mdepend, 379134459Siedowse sizeof(*mdepend)); 380134459Siedowse strcpy((char*)(mdepend + 1), s); 381134459Siedowse free(s); 382134459Siedowse file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen, 383134459Siedowse mdepend); 384134459Siedowse free(mdepend); 385134459Siedowse break; 386134459Siedowse case MDT_VERSION: 387134459Siedowse s = strdupout((vm_offset_t)md.md_cval); 388134459Siedowse COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver)); 389134459Siedowse file_addmodule(fp, s, mver.mv_version, NULL); 390134459Siedowse free(s); 391134459Siedowse modcnt++; 392134459Siedowse break; 393134459Siedowse case MDT_MODULE: 394134459Siedowse break; 395134459Siedowse default: 396134459Siedowse printf("unknown type %d\n", md.md_type); 397134459Siedowse break; 398134459Siedowse } 399134459Siedowse } 400134459Siedowse return 0; 401134459Siedowse} 402134459Siedowse 403134459Siedowsestatic int 404134459Siedowse__elfN(obj_lookup_set)(struct preloaded_file *fp, elf_file_t ef, 405134459Siedowse const char* name, Elf_Addr *startp, Elf_Addr *stopp, int *countp) 406134459Siedowse{ 407134459Siedowse Elf_Ehdr *hdr; 408134459Siedowse Elf_Shdr *shdr; 409134459Siedowse char *p; 410134459Siedowse vm_offset_t shstrtab; 411134459Siedowse int i; 412134459Siedowse 413134459Siedowse hdr = &ef->hdr; 414134459Siedowse shdr = ef->e_shdr; 415134459Siedowse shstrtab = shdr[ef->shstrindex].sh_addr; 416134459Siedowse 417134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 418134459Siedowse if (shdr[i].sh_type != SHT_PROGBITS) 419134459Siedowse continue; 420134459Siedowse if (shdr[i].sh_name == 0) 421134459Siedowse continue; 422134459Siedowse p = strdupout(shstrtab + shdr[i].sh_name); 423134459Siedowse if (strncmp(p, "set_", 4) == 0 && strcmp(p + 4, name) == 0) { 424134459Siedowse *startp = shdr[i].sh_addr; 425134459Siedowse *stopp = shdr[i].sh_addr + shdr[i].sh_size; 426134459Siedowse *countp = (*stopp - *startp) / sizeof(Elf_Addr); 427134459Siedowse free(p); 428134459Siedowse return (0); 429134459Siedowse } 430134459Siedowse free(p); 431134459Siedowse } 432134459Siedowse 433134459Siedowse return (ESRCH); 434134459Siedowse} 435134459Siedowse 436134459Siedowse/* 437134459Siedowse * Apply any intra-module relocations to the value. p is the load address 438134459Siedowse * of the value and val/len is the value to be modified. This does NOT modify 439134459Siedowse * the image in-place, because this is done by kern_linker later on. 440134459Siedowse */ 441134459Siedowsestatic int 442134459Siedowse__elfN(obj_reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, Elf_Addr p, 443134459Siedowse void *val, size_t len) 444134459Siedowse{ 445134459Siedowse Elf_Ehdr *hdr; 446134459Siedowse Elf_Shdr *shdr; 447134459Siedowse Elf_Addr off = p; 448134459Siedowse Elf_Addr base; 449134459Siedowse Elf_Rela a, *abase; 450134459Siedowse Elf_Rel r, *rbase; 451134459Siedowse int error, i, j, nrel, nrela; 452134459Siedowse 453134459Siedowse hdr = &ef->hdr; 454134459Siedowse shdr = ef->e_shdr; 455134459Siedowse 456134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 457134459Siedowse if (shdr[i].sh_type != SHT_RELA && shdr[i].sh_type != SHT_REL) 458134459Siedowse continue; 459134459Siedowse base = shdr[shdr[i].sh_info].sh_addr; 460134459Siedowse if (base == 0 || shdr[i].sh_addr == 0) 461134459Siedowse continue; 462134459Siedowse if (off < base || off + len > base + 463134459Siedowse shdr[shdr[i].sh_info].sh_size) 464134459Siedowse continue; 465134459Siedowse 466134459Siedowse switch (shdr[i].sh_type) { 467134459Siedowse case SHT_RELA: 468134459Siedowse abase = (Elf_Rela *)(intptr_t)shdr[i].sh_addr; 469134459Siedowse 470134459Siedowse nrela = shdr[i].sh_size / sizeof(Elf_Rela); 471134459Siedowse for (j = 0; j < nrela; j++) { 472134459Siedowse COPYOUT(abase + j, &a, sizeof(a)); 473134459Siedowse 474134459Siedowse error = __elfN(reloc)(ef, __elfN(obj_symaddr), 475134459Siedowse &a, ELF_RELOC_RELA, base, off, val, len); 476134459Siedowse if (error != 0) 477134459Siedowse return (error); 478134459Siedowse } 479134459Siedowse break; 480134459Siedowse case SHT_REL: 481134459Siedowse rbase = (Elf_Rel *)(intptr_t)shdr[i].sh_addr; 482134459Siedowse 483134459Siedowse nrel = shdr[i].sh_size / sizeof(Elf_Rel); 484134459Siedowse for (j = 0; j < nrel; j++) { 485134459Siedowse COPYOUT(rbase + j, &r, sizeof(r)); 486134459Siedowse 487134459Siedowse error = __elfN(reloc)(ef, __elfN(obj_symaddr), 488134459Siedowse &r, ELF_RELOC_REL, base, off, val, len); 489134459Siedowse if (error != 0) 490134459Siedowse return (error); 491134459Siedowse } 492134459Siedowse break; 493134459Siedowse } 494134459Siedowse } 495134459Siedowse return (0); 496134459Siedowse} 497134459Siedowse 498134459Siedowse/* Look up the address of a specified symbol. */ 499134459Siedowsestatic Elf_Addr 500153504Smarcel__elfN(obj_symaddr)(struct elf_file *ef, Elf_Size symidx) 501134459Siedowse{ 502134459Siedowse Elf_Sym sym; 503134459Siedowse Elf_Addr base; 504134459Siedowse int symcnt; 505134459Siedowse 506134459Siedowse symcnt = ef->e_shdr[ef->symtabindex].sh_size / sizeof(Elf_Sym); 507134459Siedowse if (symidx >= symcnt) 508134459Siedowse return (0); 509134459Siedowse COPYOUT(ef->e_shdr[ef->symtabindex].sh_addr + symidx * sizeof(Elf_Sym), 510134459Siedowse &sym, sizeof(sym)); 511134459Siedowse if (sym.st_shndx == SHN_UNDEF || sym.st_shndx >= ef->hdr.e_shnum) 512134459Siedowse return (0); 513134459Siedowse base = ef->e_shdr[sym.st_shndx].sh_addr; 514134459Siedowse if (base == 0) 515134459Siedowse return (0); 516134459Siedowse return (base + sym.st_value); 517134459Siedowse} 518