11da177e4SLinus Torvalds /* 2a53c8fabSHeiko Carstens * Kernel module help for s390. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * S390 version 5a53c8fabSHeiko Carstens * Copyright IBM Corp. 2002, 2003 61da177e4SLinus Torvalds * Author(s): Arnd Bergmann (arndb@de.ibm.com) 71da177e4SLinus Torvalds * Martin Schwidefsky (schwidefsky@de.ibm.com) 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * based on i386 version 101da177e4SLinus Torvalds * Copyright (C) 2001 Rusty Russell. 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 131da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 141da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 151da177e4SLinus Torvalds * (at your option) any later version. 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 181da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 191da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 201da177e4SLinus Torvalds * GNU General Public License for more details. 211da177e4SLinus Torvalds * 221da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 231da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 241da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 251da177e4SLinus Torvalds */ 261da177e4SLinus Torvalds #include <linux/module.h> 271da177e4SLinus Torvalds #include <linux/elf.h> 281da177e4SLinus Torvalds #include <linux/vmalloc.h> 291da177e4SLinus Torvalds #include <linux/fs.h> 301da177e4SLinus Torvalds #include <linux/string.h> 311da177e4SLinus Torvalds #include <linux/kernel.h> 322b67fc46SHeiko Carstens #include <linux/moduleloader.h> 33c0007f1aSHeiko Carstens #include <linux/bug.h> 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #if 0 361da177e4SLinus Torvalds #define DEBUGP printk 371da177e4SLinus Torvalds #else 381da177e4SLinus Torvalds #define DEBUGP(fmt , ...) 391da177e4SLinus Torvalds #endif 401da177e4SLinus Torvalds 41347a8dc3SMartin Schwidefsky #ifndef CONFIG_64BIT 421da177e4SLinus Torvalds #define PLT_ENTRY_SIZE 12 43347a8dc3SMartin Schwidefsky #else /* CONFIG_64BIT */ 441da177e4SLinus Torvalds #define PLT_ENTRY_SIZE 20 45347a8dc3SMartin Schwidefsky #endif /* CONFIG_64BIT */ 461da177e4SLinus Torvalds 47c972cc60SHeiko Carstens #ifdef CONFIG_64BIT 48c972cc60SHeiko Carstens void *module_alloc(unsigned long size) 49c972cc60SHeiko Carstens { 50c972cc60SHeiko Carstens if (PAGE_ALIGN(size) > MODULES_LEN) 51c972cc60SHeiko Carstens return NULL; 52c972cc60SHeiko Carstens return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, 53c972cc60SHeiko Carstens GFP_KERNEL, PAGE_KERNEL, -1, 54c972cc60SHeiko Carstens __builtin_return_address(0)); 55c972cc60SHeiko Carstens } 56c972cc60SHeiko Carstens #endif 57c972cc60SHeiko Carstens 581da177e4SLinus Torvalds /* Free memory returned from module_alloc */ 591da177e4SLinus Torvalds void module_free(struct module *mod, void *module_region) 601da177e4SLinus Torvalds { 613164a3cbSHendrik Brueckner if (mod) { 626a03f5f0SChristian Borntraeger vfree(mod->arch.syminfo); 636a03f5f0SChristian Borntraeger mod->arch.syminfo = NULL; 643164a3cbSHendrik Brueckner } 651da177e4SLinus Torvalds vfree(module_region); 661da177e4SLinus Torvalds } 671da177e4SLinus Torvalds 68*083e14c0SMartin Schwidefsky static void check_rela(Elf_Rela *rela, struct module *me) 691da177e4SLinus Torvalds { 701da177e4SLinus Torvalds struct mod_arch_syminfo *info; 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds info = me->arch.syminfo + ELF_R_SYM (rela->r_info); 731da177e4SLinus Torvalds switch (ELF_R_TYPE (rela->r_info)) { 741da177e4SLinus Torvalds case R_390_GOT12: /* 12 bit GOT offset. */ 751da177e4SLinus Torvalds case R_390_GOT16: /* 16 bit GOT offset. */ 761da177e4SLinus Torvalds case R_390_GOT20: /* 20 bit GOT offset. */ 771da177e4SLinus Torvalds case R_390_GOT32: /* 32 bit GOT offset. */ 781da177e4SLinus Torvalds case R_390_GOT64: /* 64 bit GOT offset. */ 791da177e4SLinus Torvalds case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */ 801da177e4SLinus Torvalds case R_390_GOTPLT12: /* 12 bit offset to jump slot. */ 811da177e4SLinus Torvalds case R_390_GOTPLT16: /* 16 bit offset to jump slot. */ 821da177e4SLinus Torvalds case R_390_GOTPLT20: /* 20 bit offset to jump slot. */ 831da177e4SLinus Torvalds case R_390_GOTPLT32: /* 32 bit offset to jump slot. */ 841da177e4SLinus Torvalds case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ 851da177e4SLinus Torvalds case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ 861da177e4SLinus Torvalds if (info->got_offset == -1UL) { 871da177e4SLinus Torvalds info->got_offset = me->arch.got_size; 881da177e4SLinus Torvalds me->arch.got_size += sizeof(void*); 891da177e4SLinus Torvalds } 901da177e4SLinus Torvalds break; 911da177e4SLinus Torvalds case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ 921da177e4SLinus Torvalds case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ 931da177e4SLinus Torvalds case R_390_PLT32: /* 32 bit PC relative PLT address. */ 941da177e4SLinus Torvalds case R_390_PLT64: /* 64 bit PC relative PLT address. */ 951da177e4SLinus Torvalds case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ 961da177e4SLinus Torvalds case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ 971da177e4SLinus Torvalds case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ 981da177e4SLinus Torvalds if (info->plt_offset == -1UL) { 991da177e4SLinus Torvalds info->plt_offset = me->arch.plt_size; 1001da177e4SLinus Torvalds me->arch.plt_size += PLT_ENTRY_SIZE; 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds break; 1031da177e4SLinus Torvalds case R_390_COPY: 1041da177e4SLinus Torvalds case R_390_GLOB_DAT: 1051da177e4SLinus Torvalds case R_390_JMP_SLOT: 1061da177e4SLinus Torvalds case R_390_RELATIVE: 1071da177e4SLinus Torvalds /* Only needed if we want to support loading of 1081da177e4SLinus Torvalds modules linked with -shared. */ 1091da177e4SLinus Torvalds break; 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds /* 1141da177e4SLinus Torvalds * Account for GOT and PLT relocations. We can't add sections for 1151da177e4SLinus Torvalds * got and plt but we can increase the core module size. 1161da177e4SLinus Torvalds */ 117*083e14c0SMartin Schwidefsky int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, 1181da177e4SLinus Torvalds char *secstrings, struct module *me) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds Elf_Shdr *symtab; 1211da177e4SLinus Torvalds Elf_Sym *symbols; 1221da177e4SLinus Torvalds Elf_Rela *rela; 1231da177e4SLinus Torvalds char *strings; 1241da177e4SLinus Torvalds int nrela, i, j; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* Find symbol table and string table. */ 127d2c993d8SHeiko Carstens symtab = NULL; 1281da177e4SLinus Torvalds for (i = 0; i < hdr->e_shnum; i++) 1291da177e4SLinus Torvalds switch (sechdrs[i].sh_type) { 1301da177e4SLinus Torvalds case SHT_SYMTAB: 1311da177e4SLinus Torvalds symtab = sechdrs + i; 1321da177e4SLinus Torvalds break; 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds if (!symtab) { 1351da177e4SLinus Torvalds printk(KERN_ERR "module %s: no symbol table\n", me->name); 1361da177e4SLinus Torvalds return -ENOEXEC; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds /* Allocate one syminfo structure per symbol. */ 1401da177e4SLinus Torvalds me->arch.nsyms = symtab->sh_size / sizeof(Elf_Sym); 1411da177e4SLinus Torvalds me->arch.syminfo = vmalloc(me->arch.nsyms * 1421da177e4SLinus Torvalds sizeof(struct mod_arch_syminfo)); 1431da177e4SLinus Torvalds if (!me->arch.syminfo) 1441da177e4SLinus Torvalds return -ENOMEM; 1451da177e4SLinus Torvalds symbols = (void *) hdr + symtab->sh_offset; 1461da177e4SLinus Torvalds strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset; 1471da177e4SLinus Torvalds for (i = 0; i < me->arch.nsyms; i++) { 1481da177e4SLinus Torvalds if (symbols[i].st_shndx == SHN_UNDEF && 1491da177e4SLinus Torvalds strcmp(strings + symbols[i].st_name, 1501da177e4SLinus Torvalds "_GLOBAL_OFFSET_TABLE_") == 0) 1511da177e4SLinus Torvalds /* "Define" it as absolute. */ 1521da177e4SLinus Torvalds symbols[i].st_shndx = SHN_ABS; 1531da177e4SLinus Torvalds me->arch.syminfo[i].got_offset = -1UL; 1541da177e4SLinus Torvalds me->arch.syminfo[i].plt_offset = -1UL; 1551da177e4SLinus Torvalds me->arch.syminfo[i].got_initialized = 0; 1561da177e4SLinus Torvalds me->arch.syminfo[i].plt_initialized = 0; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds /* Search for got/plt relocations. */ 1601da177e4SLinus Torvalds me->arch.got_size = me->arch.plt_size = 0; 1611da177e4SLinus Torvalds for (i = 0; i < hdr->e_shnum; i++) { 1621da177e4SLinus Torvalds if (sechdrs[i].sh_type != SHT_RELA) 1631da177e4SLinus Torvalds continue; 1641da177e4SLinus Torvalds nrela = sechdrs[i].sh_size / sizeof(Elf_Rela); 1651da177e4SLinus Torvalds rela = (void *) hdr + sechdrs[i].sh_offset; 1661da177e4SLinus Torvalds for (j = 0; j < nrela; j++) 1671da177e4SLinus Torvalds check_rela(rela + j, me); 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* Increase core size by size of got & plt and set start 1711da177e4SLinus Torvalds offsets for got and plt. */ 1721da177e4SLinus Torvalds me->core_size = ALIGN(me->core_size, 4); 1731da177e4SLinus Torvalds me->arch.got_offset = me->core_size; 1741da177e4SLinus Torvalds me->core_size += me->arch.got_size; 1751da177e4SLinus Torvalds me->arch.plt_offset = me->core_size; 1761da177e4SLinus Torvalds me->core_size += me->arch.plt_size; 1771da177e4SLinus Torvalds return 0; 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 180*083e14c0SMartin Schwidefsky static int apply_rela_bits(Elf_Addr loc, Elf_Addr val, 181*083e14c0SMartin Schwidefsky int sign, int bits, int shift) 182*083e14c0SMartin Schwidefsky { 183*083e14c0SMartin Schwidefsky unsigned long umax; 184*083e14c0SMartin Schwidefsky long min, max; 185*083e14c0SMartin Schwidefsky 186*083e14c0SMartin Schwidefsky if (val & ((1UL << shift) - 1)) 187*083e14c0SMartin Schwidefsky return -ENOEXEC; 188*083e14c0SMartin Schwidefsky if (sign) { 189*083e14c0SMartin Schwidefsky val = (Elf_Addr)(((long) val) >> shift); 190*083e14c0SMartin Schwidefsky min = -(1L << (bits - 1)); 191*083e14c0SMartin Schwidefsky max = (1L << (bits - 1)) - 1; 192*083e14c0SMartin Schwidefsky if ((long) val < min || (long) val > max) 193*083e14c0SMartin Schwidefsky return -ENOEXEC; 194*083e14c0SMartin Schwidefsky } else { 195*083e14c0SMartin Schwidefsky val >>= shift; 196*083e14c0SMartin Schwidefsky umax = ((1UL << (bits - 1)) << 1) - 1; 197*083e14c0SMartin Schwidefsky if ((unsigned long) val > umax) 198*083e14c0SMartin Schwidefsky return -ENOEXEC; 199*083e14c0SMartin Schwidefsky } 200*083e14c0SMartin Schwidefsky 201*083e14c0SMartin Schwidefsky if (bits == 8) 202*083e14c0SMartin Schwidefsky *(unsigned char *) loc = val; 203*083e14c0SMartin Schwidefsky else if (bits == 12) 204*083e14c0SMartin Schwidefsky *(unsigned short *) loc = (val & 0xfff) | 205*083e14c0SMartin Schwidefsky (*(unsigned short *) loc & 0xf000); 206*083e14c0SMartin Schwidefsky else if (bits == 16) 207*083e14c0SMartin Schwidefsky *(unsigned short *) loc = val; 208*083e14c0SMartin Schwidefsky else if (bits == 20) 209*083e14c0SMartin Schwidefsky *(unsigned int *) loc = (val & 0xfff) << 16 | 210*083e14c0SMartin Schwidefsky (val & 0xff000) >> 4 | 211*083e14c0SMartin Schwidefsky (*(unsigned int *) loc & 0xf00000ff); 212*083e14c0SMartin Schwidefsky else if (bits == 32) 213*083e14c0SMartin Schwidefsky *(unsigned int *) loc = val; 214*083e14c0SMartin Schwidefsky else if (bits == 64) 215*083e14c0SMartin Schwidefsky *(unsigned long *) loc = val; 216*083e14c0SMartin Schwidefsky return 0; 217*083e14c0SMartin Schwidefsky } 218*083e14c0SMartin Schwidefsky 219*083e14c0SMartin Schwidefsky static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, 220*083e14c0SMartin Schwidefsky const char *strtab, struct module *me) 2211da177e4SLinus Torvalds { 2221da177e4SLinus Torvalds struct mod_arch_syminfo *info; 2231da177e4SLinus Torvalds Elf_Addr loc, val; 2241da177e4SLinus Torvalds int r_type, r_sym; 225*083e14c0SMartin Schwidefsky int rc; 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds /* This is where to make the change */ 2281da177e4SLinus Torvalds loc = base + rela->r_offset; 2291da177e4SLinus Torvalds /* This is the symbol it is referring to. Note that all 2301da177e4SLinus Torvalds undefined symbols have been resolved. */ 2311da177e4SLinus Torvalds r_sym = ELF_R_SYM(rela->r_info); 2321da177e4SLinus Torvalds r_type = ELF_R_TYPE(rela->r_info); 2331da177e4SLinus Torvalds info = me->arch.syminfo + r_sym; 2341da177e4SLinus Torvalds val = symtab[r_sym].st_value; 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds switch (r_type) { 2371da177e4SLinus Torvalds case R_390_8: /* Direct 8 bit. */ 2381da177e4SLinus Torvalds case R_390_12: /* Direct 12 bit. */ 2391da177e4SLinus Torvalds case R_390_16: /* Direct 16 bit. */ 2401da177e4SLinus Torvalds case R_390_20: /* Direct 20 bit. */ 2411da177e4SLinus Torvalds case R_390_32: /* Direct 32 bit. */ 2421da177e4SLinus Torvalds case R_390_64: /* Direct 64 bit. */ 2431da177e4SLinus Torvalds val += rela->r_addend; 2441da177e4SLinus Torvalds if (r_type == R_390_8) 245*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 8, 0); 2461da177e4SLinus Torvalds else if (r_type == R_390_12) 247*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 12, 0); 2481da177e4SLinus Torvalds else if (r_type == R_390_16) 249*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 16, 0); 2501da177e4SLinus Torvalds else if (r_type == R_390_20) 251*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 20, 0); 2521da177e4SLinus Torvalds else if (r_type == R_390_32) 253*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 32, 0); 2541da177e4SLinus Torvalds else if (r_type == R_390_64) 255*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 64, 0); 2561da177e4SLinus Torvalds break; 2571da177e4SLinus Torvalds case R_390_PC16: /* PC relative 16 bit. */ 2581da177e4SLinus Torvalds case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */ 2591da177e4SLinus Torvalds case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */ 2601da177e4SLinus Torvalds case R_390_PC32: /* PC relative 32 bit. */ 2611da177e4SLinus Torvalds case R_390_PC64: /* PC relative 64 bit. */ 2621da177e4SLinus Torvalds val += rela->r_addend - loc; 2631da177e4SLinus Torvalds if (r_type == R_390_PC16) 264*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 16, 0); 2651da177e4SLinus Torvalds else if (r_type == R_390_PC16DBL) 266*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 16, 1); 2671da177e4SLinus Torvalds else if (r_type == R_390_PC32DBL) 268*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 32, 1); 2691da177e4SLinus Torvalds else if (r_type == R_390_PC32) 270*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 32, 0); 2711da177e4SLinus Torvalds else if (r_type == R_390_PC64) 272*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 64, 0); 2731da177e4SLinus Torvalds break; 2741da177e4SLinus Torvalds case R_390_GOT12: /* 12 bit GOT offset. */ 2751da177e4SLinus Torvalds case R_390_GOT16: /* 16 bit GOT offset. */ 2761da177e4SLinus Torvalds case R_390_GOT20: /* 20 bit GOT offset. */ 2771da177e4SLinus Torvalds case R_390_GOT32: /* 32 bit GOT offset. */ 2781da177e4SLinus Torvalds case R_390_GOT64: /* 64 bit GOT offset. */ 2791da177e4SLinus Torvalds case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */ 2801da177e4SLinus Torvalds case R_390_GOTPLT12: /* 12 bit offset to jump slot. */ 2811da177e4SLinus Torvalds case R_390_GOTPLT20: /* 20 bit offset to jump slot. */ 2821da177e4SLinus Torvalds case R_390_GOTPLT16: /* 16 bit offset to jump slot. */ 2831da177e4SLinus Torvalds case R_390_GOTPLT32: /* 32 bit offset to jump slot. */ 2841da177e4SLinus Torvalds case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ 2851da177e4SLinus Torvalds case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ 2861da177e4SLinus Torvalds if (info->got_initialized == 0) { 2871da177e4SLinus Torvalds Elf_Addr *gotent; 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds gotent = me->module_core + me->arch.got_offset + 2901da177e4SLinus Torvalds info->got_offset; 2911da177e4SLinus Torvalds *gotent = val; 2921da177e4SLinus Torvalds info->got_initialized = 1; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds val = info->got_offset + rela->r_addend; 2951da177e4SLinus Torvalds if (r_type == R_390_GOT12 || 2961da177e4SLinus Torvalds r_type == R_390_GOTPLT12) 297*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 12, 0); 2981da177e4SLinus Torvalds else if (r_type == R_390_GOT16 || 2991da177e4SLinus Torvalds r_type == R_390_GOTPLT16) 300*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 16, 0); 3011da177e4SLinus Torvalds else if (r_type == R_390_GOT20 || 3021da177e4SLinus Torvalds r_type == R_390_GOTPLT20) 303*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 20, 0); 3041da177e4SLinus Torvalds else if (r_type == R_390_GOT32 || 3051da177e4SLinus Torvalds r_type == R_390_GOTPLT32) 306*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 32, 0); 3071da177e4SLinus Torvalds else if (r_type == R_390_GOT64 || 3081da177e4SLinus Torvalds r_type == R_390_GOTPLT64) 309*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 64, 0); 310*083e14c0SMartin Schwidefsky else if (r_type == R_390_GOTENT || 311*083e14c0SMartin Schwidefsky r_type == R_390_GOTPLTENT) { 312*083e14c0SMartin Schwidefsky val += (Elf_Addr) me->module_core - loc; 313*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 32, 1); 314*083e14c0SMartin Schwidefsky } 3151da177e4SLinus Torvalds break; 3161da177e4SLinus Torvalds case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ 3171da177e4SLinus Torvalds case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ 3181da177e4SLinus Torvalds case R_390_PLT32: /* 32 bit PC relative PLT address. */ 3191da177e4SLinus Torvalds case R_390_PLT64: /* 64 bit PC relative PLT address. */ 3201da177e4SLinus Torvalds case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ 3211da177e4SLinus Torvalds case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ 3221da177e4SLinus Torvalds case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ 3231da177e4SLinus Torvalds if (info->plt_initialized == 0) { 3241da177e4SLinus Torvalds unsigned int *ip; 3251da177e4SLinus Torvalds ip = me->module_core + me->arch.plt_offset + 3261da177e4SLinus Torvalds info->plt_offset; 327347a8dc3SMartin Schwidefsky #ifndef CONFIG_64BIT 3281da177e4SLinus Torvalds ip[0] = 0x0d105810; /* basr 1,0; l 1,6(1); br 1 */ 3291da177e4SLinus Torvalds ip[1] = 0x100607f1; 3301da177e4SLinus Torvalds ip[2] = val; 331347a8dc3SMartin Schwidefsky #else /* CONFIG_64BIT */ 3321da177e4SLinus Torvalds ip[0] = 0x0d10e310; /* basr 1,0; lg 1,10(1); br 1 */ 3331da177e4SLinus Torvalds ip[1] = 0x100a0004; 3341da177e4SLinus Torvalds ip[2] = 0x07f10000; 3351da177e4SLinus Torvalds ip[3] = (unsigned int) (val >> 32); 3361da177e4SLinus Torvalds ip[4] = (unsigned int) val; 337347a8dc3SMartin Schwidefsky #endif /* CONFIG_64BIT */ 3381da177e4SLinus Torvalds info->plt_initialized = 1; 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds if (r_type == R_390_PLTOFF16 || 341504665a9SMartin Schwidefsky r_type == R_390_PLTOFF32 || 342504665a9SMartin Schwidefsky r_type == R_390_PLTOFF64) 3431da177e4SLinus Torvalds val = me->arch.plt_offset - me->arch.got_offset + 3441da177e4SLinus Torvalds info->plt_offset + rela->r_addend; 345504665a9SMartin Schwidefsky else { 346504665a9SMartin Schwidefsky if (!((r_type == R_390_PLT16DBL && 347504665a9SMartin Schwidefsky val - loc + 0xffffUL < 0x1ffffeUL) || 348504665a9SMartin Schwidefsky (r_type == R_390_PLT32DBL && 349504665a9SMartin Schwidefsky val - loc + 0xffffffffULL < 0x1fffffffeULL))) 3501da177e4SLinus Torvalds val = (Elf_Addr) me->module_core + 351504665a9SMartin Schwidefsky me->arch.plt_offset + 352504665a9SMartin Schwidefsky info->plt_offset; 353504665a9SMartin Schwidefsky val += rela->r_addend - loc; 354504665a9SMartin Schwidefsky } 3551da177e4SLinus Torvalds if (r_type == R_390_PLT16DBL) 356*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 16, 1); 3571da177e4SLinus Torvalds else if (r_type == R_390_PLTOFF16) 358*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 16, 0); 3591da177e4SLinus Torvalds else if (r_type == R_390_PLT32DBL) 360*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 32, 1); 3611da177e4SLinus Torvalds else if (r_type == R_390_PLT32 || 3621da177e4SLinus Torvalds r_type == R_390_PLTOFF32) 363*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 32, 0); 3641da177e4SLinus Torvalds else if (r_type == R_390_PLT64 || 3651da177e4SLinus Torvalds r_type == R_390_PLTOFF64) 366*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 64, 0); 3671da177e4SLinus Torvalds break; 3681da177e4SLinus Torvalds case R_390_GOTOFF16: /* 16 bit offset to GOT. */ 3691da177e4SLinus Torvalds case R_390_GOTOFF32: /* 32 bit offset to GOT. */ 3701da177e4SLinus Torvalds case R_390_GOTOFF64: /* 64 bit offset to GOT. */ 3711da177e4SLinus Torvalds val = val + rela->r_addend - 3721da177e4SLinus Torvalds ((Elf_Addr) me->module_core + me->arch.got_offset); 3731da177e4SLinus Torvalds if (r_type == R_390_GOTOFF16) 374*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 16, 0); 3751da177e4SLinus Torvalds else if (r_type == R_390_GOTOFF32) 376*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 32, 0); 3771da177e4SLinus Torvalds else if (r_type == R_390_GOTOFF64) 378*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 0, 64, 0); 3791da177e4SLinus Torvalds break; 3801da177e4SLinus Torvalds case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */ 3811da177e4SLinus Torvalds case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */ 3821da177e4SLinus Torvalds val = (Elf_Addr) me->module_core + me->arch.got_offset + 3831da177e4SLinus Torvalds rela->r_addend - loc; 3841da177e4SLinus Torvalds if (r_type == R_390_GOTPC) 385*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 32, 0); 3861da177e4SLinus Torvalds else if (r_type == R_390_GOTPCDBL) 387*083e14c0SMartin Schwidefsky rc = apply_rela_bits(loc, val, 1, 32, 1); 3881da177e4SLinus Torvalds break; 3891da177e4SLinus Torvalds case R_390_COPY: 3901da177e4SLinus Torvalds case R_390_GLOB_DAT: /* Create GOT entry. */ 3911da177e4SLinus Torvalds case R_390_JMP_SLOT: /* Create PLT entry. */ 3921da177e4SLinus Torvalds case R_390_RELATIVE: /* Adjust by program base. */ 3931da177e4SLinus Torvalds /* Only needed if we want to support loading of 3941da177e4SLinus Torvalds modules linked with -shared. */ 395*083e14c0SMartin Schwidefsky return -ENOEXEC; 3961da177e4SLinus Torvalds default: 397*083e14c0SMartin Schwidefsky printk(KERN_ERR "module %s: unknown relocation: %u\n", 3981da177e4SLinus Torvalds me->name, r_type); 3991da177e4SLinus Torvalds return -ENOEXEC; 4001da177e4SLinus Torvalds } 401*083e14c0SMartin Schwidefsky if (rc) { 402*083e14c0SMartin Schwidefsky printk(KERN_ERR "module %s: relocation error for symbol %s " 403*083e14c0SMartin Schwidefsky "(r_type %i, value 0x%lx)\n", 404*083e14c0SMartin Schwidefsky me->name, strtab + symtab[r_sym].st_name, 405*083e14c0SMartin Schwidefsky r_type, (unsigned long) val); 406*083e14c0SMartin Schwidefsky return rc; 407*083e14c0SMartin Schwidefsky } 4081da177e4SLinus Torvalds return 0; 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds 411*083e14c0SMartin Schwidefsky int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, 4121da177e4SLinus Torvalds unsigned int symindex, unsigned int relsec, 4131da177e4SLinus Torvalds struct module *me) 4141da177e4SLinus Torvalds { 4151da177e4SLinus Torvalds Elf_Addr base; 4161da177e4SLinus Torvalds Elf_Sym *symtab; 4171da177e4SLinus Torvalds Elf_Rela *rela; 4181da177e4SLinus Torvalds unsigned long i, n; 4191da177e4SLinus Torvalds int rc; 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds DEBUGP("Applying relocate section %u to %u\n", 4221da177e4SLinus Torvalds relsec, sechdrs[relsec].sh_info); 4231da177e4SLinus Torvalds base = sechdrs[sechdrs[relsec].sh_info].sh_addr; 4241da177e4SLinus Torvalds symtab = (Elf_Sym *) sechdrs[symindex].sh_addr; 4251da177e4SLinus Torvalds rela = (Elf_Rela *) sechdrs[relsec].sh_addr; 4261da177e4SLinus Torvalds n = sechdrs[relsec].sh_size / sizeof(Elf_Rela); 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds for (i = 0; i < n; i++, rela++) { 429*083e14c0SMartin Schwidefsky rc = apply_rela(rela, base, symtab, strtab, me); 4301da177e4SLinus Torvalds if (rc) 4311da177e4SLinus Torvalds return rc; 4321da177e4SLinus Torvalds } 4331da177e4SLinus Torvalds return 0; 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds int module_finalize(const Elf_Ehdr *hdr, 4371da177e4SLinus Torvalds const Elf_Shdr *sechdrs, 4381da177e4SLinus Torvalds struct module *me) 4391da177e4SLinus Torvalds { 4401da177e4SLinus Torvalds vfree(me->arch.syminfo); 4416a03f5f0SChristian Borntraeger me->arch.syminfo = NULL; 4425336377dSLinus Torvalds return 0; 4431da177e4SLinus Torvalds } 444