11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * arch/s390/kernel/module.c - Kernel module help for s390. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * S390 version 51da177e4SLinus Torvalds * Copyright (C) 2002, 2003 IBM Deutschland Entwicklung GmbH, 61da177e4SLinus Torvalds * IBM Corporation 71da177e4SLinus Torvalds * Author(s): Arnd Bergmann (arndb@de.ibm.com) 81da177e4SLinus Torvalds * Martin Schwidefsky (schwidefsky@de.ibm.com) 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * based on i386 version 111da177e4SLinus Torvalds * Copyright (C) 2001 Rusty Russell. 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 141da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 151da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 161da177e4SLinus Torvalds * (at your option) any later version. 171da177e4SLinus Torvalds * 181da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 191da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 201da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 211da177e4SLinus Torvalds * GNU General Public License for more details. 221da177e4SLinus Torvalds * 231da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 241da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 251da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 261da177e4SLinus Torvalds */ 271da177e4SLinus Torvalds #include <linux/module.h> 281da177e4SLinus Torvalds #include <linux/elf.h> 291da177e4SLinus Torvalds #include <linux/vmalloc.h> 301da177e4SLinus Torvalds #include <linux/fs.h> 311da177e4SLinus Torvalds #include <linux/string.h> 321da177e4SLinus Torvalds #include <linux/kernel.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds #if 0 351da177e4SLinus Torvalds #define DEBUGP printk 361da177e4SLinus Torvalds #else 371da177e4SLinus Torvalds #define DEBUGP(fmt , ...) 381da177e4SLinus Torvalds #endif 391da177e4SLinus Torvalds 40347a8dc3SMartin Schwidefsky #ifndef CONFIG_64BIT 411da177e4SLinus Torvalds #define PLT_ENTRY_SIZE 12 42347a8dc3SMartin Schwidefsky #else /* CONFIG_64BIT */ 431da177e4SLinus Torvalds #define PLT_ENTRY_SIZE 20 44347a8dc3SMartin Schwidefsky #endif /* CONFIG_64BIT */ 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds void *module_alloc(unsigned long size) 471da177e4SLinus Torvalds { 481da177e4SLinus Torvalds if (size == 0) 491da177e4SLinus Torvalds return NULL; 501da177e4SLinus Torvalds return vmalloc(size); 511da177e4SLinus Torvalds } 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds /* Free memory returned from module_alloc */ 541da177e4SLinus Torvalds void module_free(struct module *mod, void *module_region) 551da177e4SLinus Torvalds { 561da177e4SLinus Torvalds vfree(module_region); 571da177e4SLinus Torvalds /* FIXME: If module_region == mod->init_region, trim exception 581da177e4SLinus Torvalds table entries. */ 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds static inline void 621da177e4SLinus Torvalds check_rela(Elf_Rela *rela, struct module *me) 631da177e4SLinus Torvalds { 641da177e4SLinus Torvalds struct mod_arch_syminfo *info; 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds info = me->arch.syminfo + ELF_R_SYM (rela->r_info); 671da177e4SLinus Torvalds switch (ELF_R_TYPE (rela->r_info)) { 681da177e4SLinus Torvalds case R_390_GOT12: /* 12 bit GOT offset. */ 691da177e4SLinus Torvalds case R_390_GOT16: /* 16 bit GOT offset. */ 701da177e4SLinus Torvalds case R_390_GOT20: /* 20 bit GOT offset. */ 711da177e4SLinus Torvalds case R_390_GOT32: /* 32 bit GOT offset. */ 721da177e4SLinus Torvalds case R_390_GOT64: /* 64 bit GOT offset. */ 731da177e4SLinus Torvalds case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */ 741da177e4SLinus Torvalds case R_390_GOTPLT12: /* 12 bit offset to jump slot. */ 751da177e4SLinus Torvalds case R_390_GOTPLT16: /* 16 bit offset to jump slot. */ 761da177e4SLinus Torvalds case R_390_GOTPLT20: /* 20 bit offset to jump slot. */ 771da177e4SLinus Torvalds case R_390_GOTPLT32: /* 32 bit offset to jump slot. */ 781da177e4SLinus Torvalds case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ 791da177e4SLinus Torvalds case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ 801da177e4SLinus Torvalds if (info->got_offset == -1UL) { 811da177e4SLinus Torvalds info->got_offset = me->arch.got_size; 821da177e4SLinus Torvalds me->arch.got_size += sizeof(void*); 831da177e4SLinus Torvalds } 841da177e4SLinus Torvalds break; 851da177e4SLinus Torvalds case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ 861da177e4SLinus Torvalds case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ 871da177e4SLinus Torvalds case R_390_PLT32: /* 32 bit PC relative PLT address. */ 881da177e4SLinus Torvalds case R_390_PLT64: /* 64 bit PC relative PLT address. */ 891da177e4SLinus Torvalds case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ 901da177e4SLinus Torvalds case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ 911da177e4SLinus Torvalds case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ 921da177e4SLinus Torvalds if (info->plt_offset == -1UL) { 931da177e4SLinus Torvalds info->plt_offset = me->arch.plt_size; 941da177e4SLinus Torvalds me->arch.plt_size += PLT_ENTRY_SIZE; 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds break; 971da177e4SLinus Torvalds case R_390_COPY: 981da177e4SLinus Torvalds case R_390_GLOB_DAT: 991da177e4SLinus Torvalds case R_390_JMP_SLOT: 1001da177e4SLinus Torvalds case R_390_RELATIVE: 1011da177e4SLinus Torvalds /* Only needed if we want to support loading of 1021da177e4SLinus Torvalds modules linked with -shared. */ 1031da177e4SLinus Torvalds break; 1041da177e4SLinus Torvalds } 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds /* 1081da177e4SLinus Torvalds * Account for GOT and PLT relocations. We can't add sections for 1091da177e4SLinus Torvalds * got and plt but we can increase the core module size. 1101da177e4SLinus Torvalds */ 1111da177e4SLinus Torvalds int 1121da177e4SLinus Torvalds module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, 1131da177e4SLinus Torvalds char *secstrings, struct module *me) 1141da177e4SLinus Torvalds { 1151da177e4SLinus Torvalds Elf_Shdr *symtab; 1161da177e4SLinus Torvalds Elf_Sym *symbols; 1171da177e4SLinus Torvalds Elf_Rela *rela; 1181da177e4SLinus Torvalds char *strings; 1191da177e4SLinus Torvalds int nrela, i, j; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* Find symbol table and string table. */ 122*d2c993d8SHeiko Carstens symtab = NULL; 1231da177e4SLinus Torvalds for (i = 0; i < hdr->e_shnum; i++) 1241da177e4SLinus Torvalds switch (sechdrs[i].sh_type) { 1251da177e4SLinus Torvalds case SHT_SYMTAB: 1261da177e4SLinus Torvalds symtab = sechdrs + i; 1271da177e4SLinus Torvalds break; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds if (!symtab) { 1301da177e4SLinus Torvalds printk(KERN_ERR "module %s: no symbol table\n", me->name); 1311da177e4SLinus Torvalds return -ENOEXEC; 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* Allocate one syminfo structure per symbol. */ 1351da177e4SLinus Torvalds me->arch.nsyms = symtab->sh_size / sizeof(Elf_Sym); 1361da177e4SLinus Torvalds me->arch.syminfo = vmalloc(me->arch.nsyms * 1371da177e4SLinus Torvalds sizeof(struct mod_arch_syminfo)); 1381da177e4SLinus Torvalds if (!me->arch.syminfo) 1391da177e4SLinus Torvalds return -ENOMEM; 1401da177e4SLinus Torvalds symbols = (void *) hdr + symtab->sh_offset; 1411da177e4SLinus Torvalds strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset; 1421da177e4SLinus Torvalds for (i = 0; i < me->arch.nsyms; i++) { 1431da177e4SLinus Torvalds if (symbols[i].st_shndx == SHN_UNDEF && 1441da177e4SLinus Torvalds strcmp(strings + symbols[i].st_name, 1451da177e4SLinus Torvalds "_GLOBAL_OFFSET_TABLE_") == 0) 1461da177e4SLinus Torvalds /* "Define" it as absolute. */ 1471da177e4SLinus Torvalds symbols[i].st_shndx = SHN_ABS; 1481da177e4SLinus Torvalds me->arch.syminfo[i].got_offset = -1UL; 1491da177e4SLinus Torvalds me->arch.syminfo[i].plt_offset = -1UL; 1501da177e4SLinus Torvalds me->arch.syminfo[i].got_initialized = 0; 1511da177e4SLinus Torvalds me->arch.syminfo[i].plt_initialized = 0; 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds /* Search for got/plt relocations. */ 1551da177e4SLinus Torvalds me->arch.got_size = me->arch.plt_size = 0; 1561da177e4SLinus Torvalds for (i = 0; i < hdr->e_shnum; i++) { 1571da177e4SLinus Torvalds if (sechdrs[i].sh_type != SHT_RELA) 1581da177e4SLinus Torvalds continue; 1591da177e4SLinus Torvalds nrela = sechdrs[i].sh_size / sizeof(Elf_Rela); 1601da177e4SLinus Torvalds rela = (void *) hdr + sechdrs[i].sh_offset; 1611da177e4SLinus Torvalds for (j = 0; j < nrela; j++) 1621da177e4SLinus Torvalds check_rela(rela + j, me); 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds /* Increase core size by size of got & plt and set start 1661da177e4SLinus Torvalds offsets for got and plt. */ 1671da177e4SLinus Torvalds me->core_size = ALIGN(me->core_size, 4); 1681da177e4SLinus Torvalds me->arch.got_offset = me->core_size; 1691da177e4SLinus Torvalds me->core_size += me->arch.got_size; 1701da177e4SLinus Torvalds me->arch.plt_offset = me->core_size; 1711da177e4SLinus Torvalds me->core_size += me->arch.plt_size; 1721da177e4SLinus Torvalds return 0; 1731da177e4SLinus Torvalds } 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds int 1761da177e4SLinus Torvalds apply_relocate(Elf_Shdr *sechdrs, const char *strtab, unsigned int symindex, 1771da177e4SLinus Torvalds unsigned int relsec, struct module *me) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds printk(KERN_ERR "module %s: RELOCATION unsupported\n", 1801da177e4SLinus Torvalds me->name); 1811da177e4SLinus Torvalds return -ENOEXEC; 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds static inline int 1851da177e4SLinus Torvalds apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, 1861da177e4SLinus Torvalds struct module *me) 1871da177e4SLinus Torvalds { 1881da177e4SLinus Torvalds struct mod_arch_syminfo *info; 1891da177e4SLinus Torvalds Elf_Addr loc, val; 1901da177e4SLinus Torvalds int r_type, r_sym; 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds /* This is where to make the change */ 1931da177e4SLinus Torvalds loc = base + rela->r_offset; 1941da177e4SLinus Torvalds /* This is the symbol it is referring to. Note that all 1951da177e4SLinus Torvalds undefined symbols have been resolved. */ 1961da177e4SLinus Torvalds r_sym = ELF_R_SYM(rela->r_info); 1971da177e4SLinus Torvalds r_type = ELF_R_TYPE(rela->r_info); 1981da177e4SLinus Torvalds info = me->arch.syminfo + r_sym; 1991da177e4SLinus Torvalds val = symtab[r_sym].st_value; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds switch (r_type) { 2021da177e4SLinus Torvalds case R_390_8: /* Direct 8 bit. */ 2031da177e4SLinus Torvalds case R_390_12: /* Direct 12 bit. */ 2041da177e4SLinus Torvalds case R_390_16: /* Direct 16 bit. */ 2051da177e4SLinus Torvalds case R_390_20: /* Direct 20 bit. */ 2061da177e4SLinus Torvalds case R_390_32: /* Direct 32 bit. */ 2071da177e4SLinus Torvalds case R_390_64: /* Direct 64 bit. */ 2081da177e4SLinus Torvalds val += rela->r_addend; 2091da177e4SLinus Torvalds if (r_type == R_390_8) 2101da177e4SLinus Torvalds *(unsigned char *) loc = val; 2111da177e4SLinus Torvalds else if (r_type == R_390_12) 2121da177e4SLinus Torvalds *(unsigned short *) loc = (val & 0xfff) | 2131da177e4SLinus Torvalds (*(unsigned short *) loc & 0xf000); 2141da177e4SLinus Torvalds else if (r_type == R_390_16) 2151da177e4SLinus Torvalds *(unsigned short *) loc = val; 2161da177e4SLinus Torvalds else if (r_type == R_390_20) 2171da177e4SLinus Torvalds *(unsigned int *) loc = 2181da177e4SLinus Torvalds (*(unsigned int *) loc & 0xf00000ff) | 2191da177e4SLinus Torvalds (val & 0xfff) << 16 | (val & 0xff000) >> 4; 2201da177e4SLinus Torvalds else if (r_type == R_390_32) 2211da177e4SLinus Torvalds *(unsigned int *) loc = val; 2221da177e4SLinus Torvalds else if (r_type == R_390_64) 2231da177e4SLinus Torvalds *(unsigned long *) loc = val; 2241da177e4SLinus Torvalds break; 2251da177e4SLinus Torvalds case R_390_PC16: /* PC relative 16 bit. */ 2261da177e4SLinus Torvalds case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */ 2271da177e4SLinus Torvalds case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */ 2281da177e4SLinus Torvalds case R_390_PC32: /* PC relative 32 bit. */ 2291da177e4SLinus Torvalds case R_390_PC64: /* PC relative 64 bit. */ 2301da177e4SLinus Torvalds val += rela->r_addend - loc; 2311da177e4SLinus Torvalds if (r_type == R_390_PC16) 2321da177e4SLinus Torvalds *(unsigned short *) loc = val; 2331da177e4SLinus Torvalds else if (r_type == R_390_PC16DBL) 2341da177e4SLinus Torvalds *(unsigned short *) loc = val >> 1; 2351da177e4SLinus Torvalds else if (r_type == R_390_PC32DBL) 2361da177e4SLinus Torvalds *(unsigned int *) loc = val >> 1; 2371da177e4SLinus Torvalds else if (r_type == R_390_PC32) 2381da177e4SLinus Torvalds *(unsigned int *) loc = val; 2391da177e4SLinus Torvalds else if (r_type == R_390_PC64) 2401da177e4SLinus Torvalds *(unsigned long *) loc = val; 2411da177e4SLinus Torvalds break; 2421da177e4SLinus Torvalds case R_390_GOT12: /* 12 bit GOT offset. */ 2431da177e4SLinus Torvalds case R_390_GOT16: /* 16 bit GOT offset. */ 2441da177e4SLinus Torvalds case R_390_GOT20: /* 20 bit GOT offset. */ 2451da177e4SLinus Torvalds case R_390_GOT32: /* 32 bit GOT offset. */ 2461da177e4SLinus Torvalds case R_390_GOT64: /* 64 bit GOT offset. */ 2471da177e4SLinus Torvalds case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */ 2481da177e4SLinus Torvalds case R_390_GOTPLT12: /* 12 bit offset to jump slot. */ 2491da177e4SLinus Torvalds case R_390_GOTPLT20: /* 20 bit offset to jump slot. */ 2501da177e4SLinus Torvalds case R_390_GOTPLT16: /* 16 bit offset to jump slot. */ 2511da177e4SLinus Torvalds case R_390_GOTPLT32: /* 32 bit offset to jump slot. */ 2521da177e4SLinus Torvalds case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ 2531da177e4SLinus Torvalds case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ 2541da177e4SLinus Torvalds if (info->got_initialized == 0) { 2551da177e4SLinus Torvalds Elf_Addr *gotent; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds gotent = me->module_core + me->arch.got_offset + 2581da177e4SLinus Torvalds info->got_offset; 2591da177e4SLinus Torvalds *gotent = val; 2601da177e4SLinus Torvalds info->got_initialized = 1; 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds val = info->got_offset + rela->r_addend; 2631da177e4SLinus Torvalds if (r_type == R_390_GOT12 || 2641da177e4SLinus Torvalds r_type == R_390_GOTPLT12) 2651da177e4SLinus Torvalds *(unsigned short *) loc = (val & 0xfff) | 2661da177e4SLinus Torvalds (*(unsigned short *) loc & 0xf000); 2671da177e4SLinus Torvalds else if (r_type == R_390_GOT16 || 2681da177e4SLinus Torvalds r_type == R_390_GOTPLT16) 2691da177e4SLinus Torvalds *(unsigned short *) loc = val; 2701da177e4SLinus Torvalds else if (r_type == R_390_GOT20 || 2711da177e4SLinus Torvalds r_type == R_390_GOTPLT20) 2721da177e4SLinus Torvalds *(unsigned int *) loc = 2731da177e4SLinus Torvalds (*(unsigned int *) loc & 0xf00000ff) | 2741da177e4SLinus Torvalds (val & 0xfff) << 16 | (val & 0xff000) >> 4; 2751da177e4SLinus Torvalds else if (r_type == R_390_GOT32 || 2761da177e4SLinus Torvalds r_type == R_390_GOTPLT32) 2771da177e4SLinus Torvalds *(unsigned int *) loc = val; 2781da177e4SLinus Torvalds else if (r_type == R_390_GOTENT || 2791da177e4SLinus Torvalds r_type == R_390_GOTPLTENT) 2801da177e4SLinus Torvalds *(unsigned int *) loc = 2811da177e4SLinus Torvalds (val + (Elf_Addr) me->module_core - loc) >> 1; 2821da177e4SLinus Torvalds else if (r_type == R_390_GOT64 || 2831da177e4SLinus Torvalds r_type == R_390_GOTPLT64) 2841da177e4SLinus Torvalds *(unsigned long *) loc = val; 2851da177e4SLinus Torvalds break; 2861da177e4SLinus Torvalds case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ 2871da177e4SLinus Torvalds case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ 2881da177e4SLinus Torvalds case R_390_PLT32: /* 32 bit PC relative PLT address. */ 2891da177e4SLinus Torvalds case R_390_PLT64: /* 64 bit PC relative PLT address. */ 2901da177e4SLinus Torvalds case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ 2911da177e4SLinus Torvalds case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ 2921da177e4SLinus Torvalds case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ 2931da177e4SLinus Torvalds if (info->plt_initialized == 0) { 2941da177e4SLinus Torvalds unsigned int *ip; 2951da177e4SLinus Torvalds ip = me->module_core + me->arch.plt_offset + 2961da177e4SLinus Torvalds info->plt_offset; 297347a8dc3SMartin Schwidefsky #ifndef CONFIG_64BIT 2981da177e4SLinus Torvalds ip[0] = 0x0d105810; /* basr 1,0; l 1,6(1); br 1 */ 2991da177e4SLinus Torvalds ip[1] = 0x100607f1; 3001da177e4SLinus Torvalds ip[2] = val; 301347a8dc3SMartin Schwidefsky #else /* CONFIG_64BIT */ 3021da177e4SLinus Torvalds ip[0] = 0x0d10e310; /* basr 1,0; lg 1,10(1); br 1 */ 3031da177e4SLinus Torvalds ip[1] = 0x100a0004; 3041da177e4SLinus Torvalds ip[2] = 0x07f10000; 3051da177e4SLinus Torvalds ip[3] = (unsigned int) (val >> 32); 3061da177e4SLinus Torvalds ip[4] = (unsigned int) val; 307347a8dc3SMartin Schwidefsky #endif /* CONFIG_64BIT */ 3081da177e4SLinus Torvalds info->plt_initialized = 1; 3091da177e4SLinus Torvalds } 3101da177e4SLinus Torvalds if (r_type == R_390_PLTOFF16 || 3111da177e4SLinus Torvalds r_type == R_390_PLTOFF32 3121da177e4SLinus Torvalds || r_type == R_390_PLTOFF64 3131da177e4SLinus Torvalds ) 3141da177e4SLinus Torvalds val = me->arch.plt_offset - me->arch.got_offset + 3151da177e4SLinus Torvalds info->plt_offset + rela->r_addend; 3161da177e4SLinus Torvalds else 3171da177e4SLinus Torvalds val = (Elf_Addr) me->module_core + 3181da177e4SLinus Torvalds me->arch.plt_offset + info->plt_offset + 3191da177e4SLinus Torvalds rela->r_addend - loc; 3201da177e4SLinus Torvalds if (r_type == R_390_PLT16DBL) 3211da177e4SLinus Torvalds *(unsigned short *) loc = val >> 1; 3221da177e4SLinus Torvalds else if (r_type == R_390_PLTOFF16) 3231da177e4SLinus Torvalds *(unsigned short *) loc = val; 3241da177e4SLinus Torvalds else if (r_type == R_390_PLT32DBL) 3251da177e4SLinus Torvalds *(unsigned int *) loc = val >> 1; 3261da177e4SLinus Torvalds else if (r_type == R_390_PLT32 || 3271da177e4SLinus Torvalds r_type == R_390_PLTOFF32) 3281da177e4SLinus Torvalds *(unsigned int *) loc = val; 3291da177e4SLinus Torvalds else if (r_type == R_390_PLT64 || 3301da177e4SLinus Torvalds r_type == R_390_PLTOFF64) 3311da177e4SLinus Torvalds *(unsigned long *) loc = val; 3321da177e4SLinus Torvalds break; 3331da177e4SLinus Torvalds case R_390_GOTOFF16: /* 16 bit offset to GOT. */ 3341da177e4SLinus Torvalds case R_390_GOTOFF32: /* 32 bit offset to GOT. */ 3351da177e4SLinus Torvalds case R_390_GOTOFF64: /* 64 bit offset to GOT. */ 3361da177e4SLinus Torvalds val = val + rela->r_addend - 3371da177e4SLinus Torvalds ((Elf_Addr) me->module_core + me->arch.got_offset); 3381da177e4SLinus Torvalds if (r_type == R_390_GOTOFF16) 3391da177e4SLinus Torvalds *(unsigned short *) loc = val; 3401da177e4SLinus Torvalds else if (r_type == R_390_GOTOFF32) 3411da177e4SLinus Torvalds *(unsigned int *) loc = val; 3421da177e4SLinus Torvalds else if (r_type == R_390_GOTOFF64) 3431da177e4SLinus Torvalds *(unsigned long *) loc = val; 3441da177e4SLinus Torvalds break; 3451da177e4SLinus Torvalds case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */ 3461da177e4SLinus Torvalds case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */ 3471da177e4SLinus Torvalds val = (Elf_Addr) me->module_core + me->arch.got_offset + 3481da177e4SLinus Torvalds rela->r_addend - loc; 3491da177e4SLinus Torvalds if (r_type == R_390_GOTPC) 3501da177e4SLinus Torvalds *(unsigned int *) loc = val; 3511da177e4SLinus Torvalds else if (r_type == R_390_GOTPCDBL) 3521da177e4SLinus Torvalds *(unsigned int *) loc = val >> 1; 3531da177e4SLinus Torvalds break; 3541da177e4SLinus Torvalds case R_390_COPY: 3551da177e4SLinus Torvalds case R_390_GLOB_DAT: /* Create GOT entry. */ 3561da177e4SLinus Torvalds case R_390_JMP_SLOT: /* Create PLT entry. */ 3571da177e4SLinus Torvalds case R_390_RELATIVE: /* Adjust by program base. */ 3581da177e4SLinus Torvalds /* Only needed if we want to support loading of 3591da177e4SLinus Torvalds modules linked with -shared. */ 3601da177e4SLinus Torvalds break; 3611da177e4SLinus Torvalds default: 3621da177e4SLinus Torvalds printk(KERN_ERR "module %s: Unknown relocation: %u\n", 3631da177e4SLinus Torvalds me->name, r_type); 3641da177e4SLinus Torvalds return -ENOEXEC; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds return 0; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds int 3701da177e4SLinus Torvalds apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, 3711da177e4SLinus Torvalds unsigned int symindex, unsigned int relsec, 3721da177e4SLinus Torvalds struct module *me) 3731da177e4SLinus Torvalds { 3741da177e4SLinus Torvalds Elf_Addr base; 3751da177e4SLinus Torvalds Elf_Sym *symtab; 3761da177e4SLinus Torvalds Elf_Rela *rela; 3771da177e4SLinus Torvalds unsigned long i, n; 3781da177e4SLinus Torvalds int rc; 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds DEBUGP("Applying relocate section %u to %u\n", 3811da177e4SLinus Torvalds relsec, sechdrs[relsec].sh_info); 3821da177e4SLinus Torvalds base = sechdrs[sechdrs[relsec].sh_info].sh_addr; 3831da177e4SLinus Torvalds symtab = (Elf_Sym *) sechdrs[symindex].sh_addr; 3841da177e4SLinus Torvalds rela = (Elf_Rela *) sechdrs[relsec].sh_addr; 3851da177e4SLinus Torvalds n = sechdrs[relsec].sh_size / sizeof(Elf_Rela); 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds for (i = 0; i < n; i++, rela++) { 3881da177e4SLinus Torvalds rc = apply_rela(rela, base, symtab, me); 3891da177e4SLinus Torvalds if (rc) 3901da177e4SLinus Torvalds return rc; 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds return 0; 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds int module_finalize(const Elf_Ehdr *hdr, 3961da177e4SLinus Torvalds const Elf_Shdr *sechdrs, 3971da177e4SLinus Torvalds struct module *me) 3981da177e4SLinus Torvalds { 3991da177e4SLinus Torvalds vfree(me->arch.syminfo); 4001da177e4SLinus Torvalds return 0; 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds void module_arch_cleanup(struct module *mod) 4041da177e4SLinus Torvalds { 4051da177e4SLinus Torvalds } 406