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("$FreeBSD$"); 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 147220311Smarcel if (archsw.arch_loadaddr != NULL) 148220311Smarcel dest = archsw.arch_loadaddr(LOAD_ELF, hdr, dest); 149220311Smarcel else 150220311Smarcel dest = roundup(dest, PAGE_SIZE); 151134459Siedowse 152134459Siedowse /* 153134459Siedowse * Ok, we think we should handle this. 154134459Siedowse */ 155134459Siedowse fp = file_alloc(); 156134459Siedowse if (fp == NULL) { 157134459Siedowse printf("elf" __XSTRING(__ELF_WORD_SIZE) 158134459Siedowse "_obj_loadfile: cannot allocate module info\n"); 159134459Siedowse err = EPERM; 160134459Siedowse goto out; 161134459Siedowse } 162134459Siedowse fp->f_name = strdup(filename); 163134459Siedowse fp->f_type = strdup(__elfN(obj_moduletype)); 164134459Siedowse 165134459Siedowse printf("%s ", filename); 166134459Siedowse 167134459Siedowse fp->f_size = __elfN(obj_loadimage)(fp, &ef, dest); 168134459Siedowse if (fp->f_size == 0 || fp->f_addr == 0) 169134459Siedowse goto ioerr; 170134459Siedowse 171134459Siedowse /* save exec header as metadata */ 172134459Siedowse file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*hdr), hdr); 173134459Siedowse 174134459Siedowse /* Load OK, return module pointer */ 175134459Siedowse *result = (struct preloaded_file *)fp; 176134459Siedowse err = 0; 177134459Siedowse goto out; 178134459Siedowse 179134459Siedowseioerr: 180134459Siedowse err = EIO; 181134459Siedowseoerr: 182134459Siedowse file_discard(fp); 183134459Siedowseout: 184134459Siedowse close(ef.fd); 185134459Siedowse if (ef.e_shdr != NULL) 186134459Siedowse free(ef.e_shdr); 187134459Siedowse 188134459Siedowse return(err); 189134459Siedowse} 190134459Siedowse 191134459Siedowse/* 192134459Siedowse * With the file (fd) open on the image, and (ehdr) containing 193134459Siedowse * the Elf header, load the image at (off) 194134459Siedowse */ 195134459Siedowsestatic int 196134459Siedowse__elfN(obj_loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off) 197134459Siedowse{ 198134459Siedowse Elf_Ehdr *hdr; 199223295Skan Elf_Shdr *shdr, *cshdr, *lshdr; 200134459Siedowse vm_offset_t firstaddr, lastaddr; 201134459Siedowse int i, nsym, res, ret, shdrbytes, symstrindex; 202134459Siedowse 203134459Siedowse ret = 0; 204134459Siedowse firstaddr = lastaddr = (vm_offset_t)off; 205134459Siedowse hdr = &ef->hdr; 206134459Siedowse ef->off = (vm_offset_t)off; 207134459Siedowse 208134459Siedowse /* Read in the section headers. */ 209134459Siedowse shdrbytes = hdr->e_shnum * hdr->e_shentsize; 210134459Siedowse shdr = alloc_pread(ef->fd, (off_t)hdr->e_shoff, shdrbytes); 211134459Siedowse if (shdr == NULL) { 212134459Siedowse printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 213134459Siedowse "_obj_loadimage: read section headers failed\n"); 214134459Siedowse goto out; 215134459Siedowse } 216134459Siedowse ef->e_shdr = shdr; 217134459Siedowse 218134459Siedowse /* 219134459Siedowse * Decide where to load everything, but don't read it yet. 220134459Siedowse * We store the load address as a non-zero sh_addr value. 221134459Siedowse * Start with the code/data and bss. 222134459Siedowse */ 223134459Siedowse for (i = 0; i < hdr->e_shnum; i++) 224134459Siedowse shdr[i].sh_addr = 0; 225134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 226210423Savg if (shdr[i].sh_size == 0) 227210423Savg continue; 228134459Siedowse switch (shdr[i].sh_type) { 229134459Siedowse case SHT_PROGBITS: 230134459Siedowse case SHT_NOBITS: 231134459Siedowse lastaddr = roundup(lastaddr, shdr[i].sh_addralign); 232134459Siedowse shdr[i].sh_addr = (Elf_Addr)lastaddr; 233134459Siedowse lastaddr += shdr[i].sh_size; 234134459Siedowse break; 235134459Siedowse } 236134459Siedowse } 237134459Siedowse 238134459Siedowse /* Symbols. */ 239134459Siedowse nsym = 0; 240134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 241134459Siedowse switch (shdr[i].sh_type) { 242134459Siedowse case SHT_SYMTAB: 243134459Siedowse nsym++; 244134459Siedowse ef->symtabindex = i; 245134459Siedowse shdr[i].sh_addr = (Elf_Addr)lastaddr; 246134459Siedowse lastaddr += shdr[i].sh_size; 247134459Siedowse break; 248134459Siedowse } 249134459Siedowse } 250134459Siedowse if (nsym != 1) { 251134459Siedowse printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 252134459Siedowse "_obj_loadimage: file has no valid symbol table\n"); 253134459Siedowse goto out; 254134459Siedowse } 255134459Siedowse lastaddr = roundup(lastaddr, shdr[ef->symtabindex].sh_addralign); 256134459Siedowse shdr[ef->symtabindex].sh_addr = (Elf_Addr)lastaddr; 257134459Siedowse lastaddr += shdr[ef->symtabindex].sh_size; 258134459Siedowse 259134459Siedowse symstrindex = shdr[ef->symtabindex].sh_link; 260134459Siedowse if (symstrindex < 0 || symstrindex >= hdr->e_shnum || 261134459Siedowse shdr[symstrindex].sh_type != SHT_STRTAB) { 262134459Siedowse printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 263134459Siedowse "_obj_loadimage: file has invalid symbol strings\n"); 264134459Siedowse goto out; 265134459Siedowse } 266134459Siedowse lastaddr = roundup(lastaddr, shdr[symstrindex].sh_addralign); 267134459Siedowse shdr[symstrindex].sh_addr = (Elf_Addr)lastaddr; 268134459Siedowse lastaddr += shdr[symstrindex].sh_size; 269134459Siedowse 270134459Siedowse /* Section names. */ 271134459Siedowse if (hdr->e_shstrndx == 0 || hdr->e_shstrndx >= hdr->e_shnum || 272134459Siedowse shdr[hdr->e_shstrndx].sh_type != SHT_STRTAB) { 273134459Siedowse printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 274134459Siedowse "_obj_loadimage: file has no section names\n"); 275134459Siedowse goto out; 276134459Siedowse } 277134459Siedowse ef->shstrindex = hdr->e_shstrndx; 278134459Siedowse lastaddr = roundup(lastaddr, shdr[ef->shstrindex].sh_addralign); 279134459Siedowse shdr[ef->shstrindex].sh_addr = (Elf_Addr)lastaddr; 280134459Siedowse lastaddr += shdr[ef->shstrindex].sh_size; 281134459Siedowse 282134459Siedowse /* Relocation tables. */ 283134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 284134459Siedowse switch (shdr[i].sh_type) { 285134459Siedowse case SHT_REL: 286134459Siedowse case SHT_RELA: 287134459Siedowse lastaddr = roundup(lastaddr, shdr[i].sh_addralign); 288134459Siedowse shdr[i].sh_addr = (Elf_Addr)lastaddr; 289134459Siedowse lastaddr += shdr[i].sh_size; 290134459Siedowse break; 291134459Siedowse } 292134459Siedowse } 293134459Siedowse 294134459Siedowse /* Clear the whole area, including bss regions. */ 295134459Siedowse kern_bzero(firstaddr, lastaddr - firstaddr); 296134459Siedowse 297223295Skan /* Figure section with the lowest file offset we haven't loaded yet. */ 298223295Skan for (cshdr = NULL; /* none */; /* none */) 299223295Skan { 300223295Skan /* 301223295Skan * Find next section to load. The complexity of this loop is 302223295Skan * O(n^2), but with the number of sections being typically 303223295Skan * small, we do not care. 304223295Skan */ 305223295Skan lshdr = cshdr; 306223295Skan 307223295Skan for (i = 0; i < hdr->e_shnum; i++) { 308223295Skan if (shdr[i].sh_addr == 0 || 309223295Skan shdr[i].sh_type == SHT_NOBITS) 310223295Skan continue; 311223295Skan /* Skip sections that were loaded already. */ 312223295Skan if (lshdr != NULL && 313223295Skan lshdr->sh_offset >= shdr[i].sh_offset) 314223295Skan continue; 315223295Skan /* Find section with smallest offset. */ 316223295Skan if (cshdr == lshdr || 317223295Skan cshdr->sh_offset > shdr[i].sh_offset) 318223295Skan cshdr = &shdr[i]; 319223295Skan } 320223295Skan 321223295Skan if (cshdr == lshdr) 322223295Skan break; 323223295Skan 324223295Skan if (kern_pread(ef->fd, (vm_offset_t)cshdr->sh_addr, 325223295Skan cshdr->sh_size, (off_t)cshdr->sh_offset) != 0) { 326134459Siedowse printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 327134459Siedowse "_obj_loadimage: read failed\n"); 328134459Siedowse goto out; 329134459Siedowse } 330134459Siedowse } 331134459Siedowse 332134459Siedowse file_addmetadata(fp, MODINFOMD_SHDR, shdrbytes, shdr); 333134459Siedowse 334134459Siedowse res = __elfN(obj_parse_modmetadata)(fp, ef); 335134459Siedowse if (res != 0) 336134459Siedowse goto out; 337134459Siedowse 338134459Siedowse ret = lastaddr - firstaddr; 339134459Siedowse fp->f_addr = firstaddr; 340134459Siedowse 341134459Siedowse printf("size 0x%lx at 0x%lx", (u_long)ret, (u_long)firstaddr); 342134459Siedowse 343134459Siedowseout: 344134459Siedowse printf("\n"); 345134459Siedowse return ret; 346134459Siedowse} 347134459Siedowse 348134459Siedowse#if defined(__i386__) && __ELF_WORD_SIZE == 64 349134459Siedowsestruct mod_metadata64 { 350134459Siedowse int md_version; /* structure version MDTV_* */ 351134459Siedowse int md_type; /* type of entry MDT_* */ 352134459Siedowse u_int64_t md_data; /* specific data */ 353134459Siedowse u_int64_t md_cval; /* common string label */ 354134459Siedowse}; 355134459Siedowse#endif 356134459Siedowse 357134459Siedowseint 358134459Siedowse__elfN(obj_parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef) 359134459Siedowse{ 360134459Siedowse struct mod_metadata md; 361134459Siedowse#if defined(__i386__) && __ELF_WORD_SIZE == 64 362134459Siedowse struct mod_metadata64 md64; 363134459Siedowse#endif 364134459Siedowse struct mod_depend *mdepend; 365134459Siedowse struct mod_version mver; 366134459Siedowse char *s; 367134459Siedowse int error, modcnt, minfolen; 368134459Siedowse Elf_Addr v, p, p_stop; 369134459Siedowse 370134459Siedowse if (__elfN(obj_lookup_set)(fp, ef, "modmetadata_set", &p, &p_stop, 371134459Siedowse &modcnt) != 0) 372237338Sjhb return 0; 373134459Siedowse 374134459Siedowse modcnt = 0; 375134459Siedowse while (p < p_stop) { 376134459Siedowse COPYOUT(p, &v, sizeof(v)); 377134459Siedowse error = __elfN(obj_reloc_ptr)(fp, ef, p, &v, sizeof(v)); 378134459Siedowse if (error != 0) 379134459Siedowse return (error); 380134459Siedowse#if defined(__i386__) && __ELF_WORD_SIZE == 64 381134459Siedowse COPYOUT(v, &md64, sizeof(md64)); 382134459Siedowse error = __elfN(obj_reloc_ptr)(fp, ef, v, &md64, sizeof(md64)); 383134459Siedowse if (error != 0) 384134459Siedowse return (error); 385134459Siedowse md.md_version = md64.md_version; 386134459Siedowse md.md_type = md64.md_type; 387134459Siedowse md.md_cval = (const char *)(uintptr_t)md64.md_cval; 388134459Siedowse md.md_data = (void *)(uintptr_t)md64.md_data; 389134459Siedowse#else 390134459Siedowse COPYOUT(v, &md, sizeof(md)); 391134459Siedowse error = __elfN(obj_reloc_ptr)(fp, ef, v, &md, sizeof(md)); 392134459Siedowse if (error != 0) 393134459Siedowse return (error); 394134459Siedowse#endif 395134459Siedowse p += sizeof(Elf_Addr); 396134459Siedowse switch(md.md_type) { 397134459Siedowse case MDT_DEPEND: 398134459Siedowse s = strdupout((vm_offset_t)md.md_cval); 399134459Siedowse minfolen = sizeof(*mdepend) + strlen(s) + 1; 400134459Siedowse mdepend = malloc(minfolen); 401134459Siedowse if (mdepend == NULL) 402134459Siedowse return ENOMEM; 403134459Siedowse COPYOUT((vm_offset_t)md.md_data, mdepend, 404134459Siedowse sizeof(*mdepend)); 405134459Siedowse strcpy((char*)(mdepend + 1), s); 406134459Siedowse free(s); 407134459Siedowse file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen, 408134459Siedowse mdepend); 409134459Siedowse free(mdepend); 410134459Siedowse break; 411134459Siedowse case MDT_VERSION: 412134459Siedowse s = strdupout((vm_offset_t)md.md_cval); 413134459Siedowse COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver)); 414134459Siedowse file_addmodule(fp, s, mver.mv_version, NULL); 415134459Siedowse free(s); 416134459Siedowse modcnt++; 417134459Siedowse break; 418134459Siedowse case MDT_MODULE: 419134459Siedowse break; 420134459Siedowse default: 421134459Siedowse printf("unknown type %d\n", md.md_type); 422134459Siedowse break; 423134459Siedowse } 424134459Siedowse } 425134459Siedowse return 0; 426134459Siedowse} 427134459Siedowse 428134459Siedowsestatic int 429134459Siedowse__elfN(obj_lookup_set)(struct preloaded_file *fp, elf_file_t ef, 430134459Siedowse const char* name, Elf_Addr *startp, Elf_Addr *stopp, int *countp) 431134459Siedowse{ 432134459Siedowse Elf_Ehdr *hdr; 433134459Siedowse Elf_Shdr *shdr; 434134459Siedowse char *p; 435134459Siedowse vm_offset_t shstrtab; 436134459Siedowse int i; 437134459Siedowse 438134459Siedowse hdr = &ef->hdr; 439134459Siedowse shdr = ef->e_shdr; 440134459Siedowse shstrtab = shdr[ef->shstrindex].sh_addr; 441134459Siedowse 442134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 443134459Siedowse if (shdr[i].sh_type != SHT_PROGBITS) 444134459Siedowse continue; 445134459Siedowse if (shdr[i].sh_name == 0) 446134459Siedowse continue; 447134459Siedowse p = strdupout(shstrtab + shdr[i].sh_name); 448134459Siedowse if (strncmp(p, "set_", 4) == 0 && strcmp(p + 4, name) == 0) { 449134459Siedowse *startp = shdr[i].sh_addr; 450134459Siedowse *stopp = shdr[i].sh_addr + shdr[i].sh_size; 451134459Siedowse *countp = (*stopp - *startp) / sizeof(Elf_Addr); 452134459Siedowse free(p); 453134459Siedowse return (0); 454134459Siedowse } 455134459Siedowse free(p); 456134459Siedowse } 457134459Siedowse 458134459Siedowse return (ESRCH); 459134459Siedowse} 460134459Siedowse 461134459Siedowse/* 462134459Siedowse * Apply any intra-module relocations to the value. p is the load address 463134459Siedowse * of the value and val/len is the value to be modified. This does NOT modify 464134459Siedowse * the image in-place, because this is done by kern_linker later on. 465134459Siedowse */ 466134459Siedowsestatic int 467134459Siedowse__elfN(obj_reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, Elf_Addr p, 468134459Siedowse void *val, size_t len) 469134459Siedowse{ 470134459Siedowse Elf_Ehdr *hdr; 471134459Siedowse Elf_Shdr *shdr; 472134459Siedowse Elf_Addr off = p; 473134459Siedowse Elf_Addr base; 474134459Siedowse Elf_Rela a, *abase; 475134459Siedowse Elf_Rel r, *rbase; 476134459Siedowse int error, i, j, nrel, nrela; 477134459Siedowse 478134459Siedowse hdr = &ef->hdr; 479134459Siedowse shdr = ef->e_shdr; 480134459Siedowse 481134459Siedowse for (i = 0; i < hdr->e_shnum; i++) { 482134459Siedowse if (shdr[i].sh_type != SHT_RELA && shdr[i].sh_type != SHT_REL) 483134459Siedowse continue; 484134459Siedowse base = shdr[shdr[i].sh_info].sh_addr; 485134459Siedowse if (base == 0 || shdr[i].sh_addr == 0) 486134459Siedowse continue; 487134459Siedowse if (off < base || off + len > base + 488134459Siedowse shdr[shdr[i].sh_info].sh_size) 489134459Siedowse continue; 490134459Siedowse 491134459Siedowse switch (shdr[i].sh_type) { 492134459Siedowse case SHT_RELA: 493134459Siedowse abase = (Elf_Rela *)(intptr_t)shdr[i].sh_addr; 494134459Siedowse 495134459Siedowse nrela = shdr[i].sh_size / sizeof(Elf_Rela); 496134459Siedowse for (j = 0; j < nrela; j++) { 497134459Siedowse COPYOUT(abase + j, &a, sizeof(a)); 498134459Siedowse 499134459Siedowse error = __elfN(reloc)(ef, __elfN(obj_symaddr), 500134459Siedowse &a, ELF_RELOC_RELA, base, off, val, len); 501134459Siedowse if (error != 0) 502134459Siedowse return (error); 503134459Siedowse } 504134459Siedowse break; 505134459Siedowse case SHT_REL: 506134459Siedowse rbase = (Elf_Rel *)(intptr_t)shdr[i].sh_addr; 507134459Siedowse 508134459Siedowse nrel = shdr[i].sh_size / sizeof(Elf_Rel); 509134459Siedowse for (j = 0; j < nrel; j++) { 510134459Siedowse COPYOUT(rbase + j, &r, sizeof(r)); 511134459Siedowse 512134459Siedowse error = __elfN(reloc)(ef, __elfN(obj_symaddr), 513134459Siedowse &r, ELF_RELOC_REL, base, off, val, len); 514134459Siedowse if (error != 0) 515134459Siedowse return (error); 516134459Siedowse } 517134459Siedowse break; 518134459Siedowse } 519134459Siedowse } 520134459Siedowse return (0); 521134459Siedowse} 522134459Siedowse 523134459Siedowse/* Look up the address of a specified symbol. */ 524134459Siedowsestatic Elf_Addr 525153504Smarcel__elfN(obj_symaddr)(struct elf_file *ef, Elf_Size symidx) 526134459Siedowse{ 527134459Siedowse Elf_Sym sym; 528134459Siedowse Elf_Addr base; 529134459Siedowse int symcnt; 530134459Siedowse 531134459Siedowse symcnt = ef->e_shdr[ef->symtabindex].sh_size / sizeof(Elf_Sym); 532134459Siedowse if (symidx >= symcnt) 533134459Siedowse return (0); 534134459Siedowse COPYOUT(ef->e_shdr[ef->symtabindex].sh_addr + symidx * sizeof(Elf_Sym), 535134459Siedowse &sym, sizeof(sym)); 536134459Siedowse if (sym.st_shndx == SHN_UNDEF || sym.st_shndx >= ef->hdr.e_shnum) 537134459Siedowse return (0); 538134459Siedowse base = ef->e_shdr[sym.st_shndx].sh_addr; 539134459Siedowse if (base == 0) 540134459Siedowse return (0); 541134459Siedowse return (base + sym.st_value); 542134459Siedowse} 543