1a17ae4c3SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 21da177e4SLinus Torvalds /* 3a53c8fabSHeiko Carstens * Kernel module help for s390. 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * S390 version 6a53c8fabSHeiko Carstens * Copyright IBM Corp. 2002, 2003 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 #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/elf.h> 151da177e4SLinus Torvalds #include <linux/vmalloc.h> 161da177e4SLinus Torvalds #include <linux/fs.h> 17de5012b4SIlya Leoshkevich #include <linux/ftrace.h> 181da177e4SLinus Torvalds #include <linux/string.h> 191da177e4SLinus Torvalds #include <linux/kernel.h> 20793213a8SVasily Gorbik #include <linux/kasan.h> 212b67fc46SHeiko Carstens #include <linux/moduleloader.h> 22c0007f1aSHeiko Carstens #include <linux/bug.h> 23be242261SPeter Zijlstra #include <linux/memory.h> 24686140a1SVasily Gorbik #include <asm/alternative.h> 25f19fbd5eSMartin Schwidefsky #include <asm/nospec-branch.h> 26f19fbd5eSMartin Schwidefsky #include <asm/facility.h> 27de5012b4SIlya Leoshkevich #include <asm/ftrace.lds.h> 28de5012b4SIlya Leoshkevich #include <asm/set_memory.h> 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds #if 0 311da177e4SLinus Torvalds #define DEBUGP printk 321da177e4SLinus Torvalds #else 331da177e4SLinus Torvalds #define DEBUGP(fmt , ...) 341da177e4SLinus Torvalds #endif 351da177e4SLinus Torvalds 36*f3b7e73bSIlya Leoshkevich #define PLT_ENTRY_SIZE 22 371da177e4SLinus Torvalds 38c972cc60SHeiko Carstens void *module_alloc(unsigned long size) 39c972cc60SHeiko Carstens { 4060115fa5SKefeng Wang gfp_t gfp_mask = GFP_KERNEL; 41793213a8SVasily Gorbik void *p; 42793213a8SVasily Gorbik 43c972cc60SHeiko Carstens if (PAGE_ALIGN(size) > MODULES_LEN) 44c972cc60SHeiko Carstens return NULL; 45793213a8SVasily Gorbik p = __vmalloc_node_range(size, MODULE_ALIGN, MODULES_VADDR, MODULES_END, 4660115fa5SKefeng Wang gfp_mask, PAGE_KERNEL_EXEC, VM_DEFER_KMEMLEAK, NUMA_NO_NODE, 47c972cc60SHeiko Carstens __builtin_return_address(0)); 4860115fa5SKefeng Wang if (p && (kasan_module_alloc(p, size, gfp_mask) < 0)) { 49793213a8SVasily Gorbik vfree(p); 50793213a8SVasily Gorbik return NULL; 51793213a8SVasily Gorbik } 52793213a8SVasily Gorbik return p; 53c972cc60SHeiko Carstens } 54c972cc60SHeiko Carstens 55de5012b4SIlya Leoshkevich #ifdef CONFIG_FUNCTION_TRACER 56de5012b4SIlya Leoshkevich void module_arch_cleanup(struct module *mod) 57de5012b4SIlya Leoshkevich { 58de5012b4SIlya Leoshkevich module_memfree(mod->arch.trampolines_start); 59de5012b4SIlya Leoshkevich } 60de5012b4SIlya Leoshkevich #endif 61de5012b4SIlya Leoshkevich 62d453cdedSRusty Russell void module_arch_freeing_init(struct module *mod) 631da177e4SLinus Torvalds { 64f31e0960SJessica Yu if (is_livepatch_module(mod) && 65f31e0960SJessica Yu mod->state == MODULE_STATE_LIVE) 66f31e0960SJessica Yu return; 67f31e0960SJessica Yu 686a03f5f0SChristian Borntraeger vfree(mod->arch.syminfo); 696a03f5f0SChristian Borntraeger mod->arch.syminfo = NULL; 703164a3cbSHendrik Brueckner } 711da177e4SLinus Torvalds 72083e14c0SMartin Schwidefsky static void check_rela(Elf_Rela *rela, struct module *me) 731da177e4SLinus Torvalds { 741da177e4SLinus Torvalds struct mod_arch_syminfo *info; 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds info = me->arch.syminfo + ELF_R_SYM (rela->r_info); 771da177e4SLinus Torvalds switch (ELF_R_TYPE (rela->r_info)) { 781da177e4SLinus Torvalds case R_390_GOT12: /* 12 bit GOT offset. */ 791da177e4SLinus Torvalds case R_390_GOT16: /* 16 bit GOT offset. */ 801da177e4SLinus Torvalds case R_390_GOT20: /* 20 bit GOT offset. */ 811da177e4SLinus Torvalds case R_390_GOT32: /* 32 bit GOT offset. */ 821da177e4SLinus Torvalds case R_390_GOT64: /* 64 bit GOT offset. */ 831da177e4SLinus Torvalds case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */ 841da177e4SLinus Torvalds case R_390_GOTPLT12: /* 12 bit offset to jump slot. */ 851da177e4SLinus Torvalds case R_390_GOTPLT16: /* 16 bit offset to jump slot. */ 861da177e4SLinus Torvalds case R_390_GOTPLT20: /* 20 bit offset to jump slot. */ 871da177e4SLinus Torvalds case R_390_GOTPLT32: /* 32 bit offset to jump slot. */ 881da177e4SLinus Torvalds case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ 891da177e4SLinus Torvalds case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ 901da177e4SLinus Torvalds if (info->got_offset == -1UL) { 911da177e4SLinus Torvalds info->got_offset = me->arch.got_size; 921da177e4SLinus Torvalds me->arch.got_size += sizeof(void*); 931da177e4SLinus Torvalds } 941da177e4SLinus Torvalds break; 951da177e4SLinus Torvalds case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ 961da177e4SLinus Torvalds case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ 971da177e4SLinus Torvalds case R_390_PLT32: /* 32 bit PC relative PLT address. */ 981da177e4SLinus Torvalds case R_390_PLT64: /* 64 bit PC relative PLT address. */ 991da177e4SLinus Torvalds case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ 1001da177e4SLinus Torvalds case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ 1011da177e4SLinus Torvalds case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ 1021da177e4SLinus Torvalds if (info->plt_offset == -1UL) { 1031da177e4SLinus Torvalds info->plt_offset = me->arch.plt_size; 1041da177e4SLinus Torvalds me->arch.plt_size += PLT_ENTRY_SIZE; 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds break; 1071da177e4SLinus Torvalds case R_390_COPY: 1081da177e4SLinus Torvalds case R_390_GLOB_DAT: 1091da177e4SLinus Torvalds case R_390_JMP_SLOT: 1101da177e4SLinus Torvalds case R_390_RELATIVE: 1111da177e4SLinus Torvalds /* Only needed if we want to support loading of 1121da177e4SLinus Torvalds modules linked with -shared. */ 1131da177e4SLinus Torvalds break; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds /* 1181da177e4SLinus Torvalds * Account for GOT and PLT relocations. We can't add sections for 1191da177e4SLinus Torvalds * got and plt but we can increase the core module size. 1201da177e4SLinus Torvalds */ 121083e14c0SMartin Schwidefsky int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, 1221da177e4SLinus Torvalds char *secstrings, struct module *me) 1231da177e4SLinus Torvalds { 1241da177e4SLinus Torvalds Elf_Shdr *symtab; 1251da177e4SLinus Torvalds Elf_Sym *symbols; 1261da177e4SLinus Torvalds Elf_Rela *rela; 1271da177e4SLinus Torvalds char *strings; 1281da177e4SLinus Torvalds int nrela, i, j; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds /* Find symbol table and string table. */ 131d2c993d8SHeiko Carstens symtab = NULL; 1321da177e4SLinus Torvalds for (i = 0; i < hdr->e_shnum; i++) 1331da177e4SLinus Torvalds switch (sechdrs[i].sh_type) { 1341da177e4SLinus Torvalds case SHT_SYMTAB: 1351da177e4SLinus Torvalds symtab = sechdrs + i; 1361da177e4SLinus Torvalds break; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds if (!symtab) { 1391da177e4SLinus Torvalds printk(KERN_ERR "module %s: no symbol table\n", me->name); 1401da177e4SLinus Torvalds return -ENOEXEC; 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds /* Allocate one syminfo structure per symbol. */ 1441da177e4SLinus Torvalds me->arch.nsyms = symtab->sh_size / sizeof(Elf_Sym); 14542bc47b3SKees Cook me->arch.syminfo = vmalloc(array_size(sizeof(struct mod_arch_syminfo), 14642bc47b3SKees Cook me->arch.nsyms)); 1471da177e4SLinus Torvalds if (!me->arch.syminfo) 1481da177e4SLinus Torvalds return -ENOMEM; 1491da177e4SLinus Torvalds symbols = (void *) hdr + symtab->sh_offset; 1501da177e4SLinus Torvalds strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset; 1511da177e4SLinus Torvalds for (i = 0; i < me->arch.nsyms; i++) { 1521da177e4SLinus Torvalds if (symbols[i].st_shndx == SHN_UNDEF && 1531da177e4SLinus Torvalds strcmp(strings + symbols[i].st_name, 1541da177e4SLinus Torvalds "_GLOBAL_OFFSET_TABLE_") == 0) 1551da177e4SLinus Torvalds /* "Define" it as absolute. */ 1561da177e4SLinus Torvalds symbols[i].st_shndx = SHN_ABS; 1571da177e4SLinus Torvalds me->arch.syminfo[i].got_offset = -1UL; 1581da177e4SLinus Torvalds me->arch.syminfo[i].plt_offset = -1UL; 1591da177e4SLinus Torvalds me->arch.syminfo[i].got_initialized = 0; 1601da177e4SLinus Torvalds me->arch.syminfo[i].plt_initialized = 0; 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds /* Search for got/plt relocations. */ 1641da177e4SLinus Torvalds me->arch.got_size = me->arch.plt_size = 0; 1651da177e4SLinus Torvalds for (i = 0; i < hdr->e_shnum; i++) { 1661da177e4SLinus Torvalds if (sechdrs[i].sh_type != SHT_RELA) 1671da177e4SLinus Torvalds continue; 1681da177e4SLinus Torvalds nrela = sechdrs[i].sh_size / sizeof(Elf_Rela); 1691da177e4SLinus Torvalds rela = (void *) hdr + sechdrs[i].sh_offset; 1701da177e4SLinus Torvalds for (j = 0; j < nrela; j++) 1711da177e4SLinus Torvalds check_rela(rela + j, me); 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds /* Increase core size by size of got & plt and set start 1751da177e4SLinus Torvalds offsets for got and plt. */ 1767523e4dcSRusty Russell me->core_layout.size = ALIGN(me->core_layout.size, 4); 1777523e4dcSRusty Russell me->arch.got_offset = me->core_layout.size; 1787523e4dcSRusty Russell me->core_layout.size += me->arch.got_size; 1797523e4dcSRusty Russell me->arch.plt_offset = me->core_layout.size; 180f19fbd5eSMartin Schwidefsky if (me->arch.plt_size) { 1816e179d64SMartin Schwidefsky if (IS_ENABLED(CONFIG_EXPOLINE) && !nospec_disable) 182f19fbd5eSMartin Schwidefsky me->arch.plt_size += PLT_ENTRY_SIZE; 1837523e4dcSRusty Russell me->core_layout.size += me->arch.plt_size; 184f19fbd5eSMartin Schwidefsky } 1851da177e4SLinus Torvalds return 0; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 188083e14c0SMartin Schwidefsky static int apply_rela_bits(Elf_Addr loc, Elf_Addr val, 189be242261SPeter Zijlstra int sign, int bits, int shift, 190be242261SPeter Zijlstra void *(*write)(void *dest, const void *src, size_t len)) 191083e14c0SMartin Schwidefsky { 192083e14c0SMartin Schwidefsky unsigned long umax; 193083e14c0SMartin Schwidefsky long min, max; 194be242261SPeter Zijlstra void *dest = (void *)loc; 195083e14c0SMartin Schwidefsky 196083e14c0SMartin Schwidefsky if (val & ((1UL << shift) - 1)) 197083e14c0SMartin Schwidefsky return -ENOEXEC; 198083e14c0SMartin Schwidefsky if (sign) { 199083e14c0SMartin Schwidefsky val = (Elf_Addr)(((long) val) >> shift); 200083e14c0SMartin Schwidefsky min = -(1L << (bits - 1)); 201083e14c0SMartin Schwidefsky max = (1L << (bits - 1)) - 1; 202083e14c0SMartin Schwidefsky if ((long) val < min || (long) val > max) 203083e14c0SMartin Schwidefsky return -ENOEXEC; 204083e14c0SMartin Schwidefsky } else { 205083e14c0SMartin Schwidefsky val >>= shift; 206083e14c0SMartin Schwidefsky umax = ((1UL << (bits - 1)) << 1) - 1; 207083e14c0SMartin Schwidefsky if ((unsigned long) val > umax) 208083e14c0SMartin Schwidefsky return -ENOEXEC; 209083e14c0SMartin Schwidefsky } 210083e14c0SMartin Schwidefsky 211be242261SPeter Zijlstra if (bits == 8) { 212be242261SPeter Zijlstra unsigned char tmp = val; 213be242261SPeter Zijlstra write(dest, &tmp, 1); 214be242261SPeter Zijlstra } else if (bits == 12) { 215be242261SPeter Zijlstra unsigned short tmp = (val & 0xfff) | 216083e14c0SMartin Schwidefsky (*(unsigned short *) loc & 0xf000); 217be242261SPeter Zijlstra write(dest, &tmp, 2); 218be242261SPeter Zijlstra } else if (bits == 16) { 219be242261SPeter Zijlstra unsigned short tmp = val; 220be242261SPeter Zijlstra write(dest, &tmp, 2); 221be242261SPeter Zijlstra } else if (bits == 20) { 222be242261SPeter Zijlstra unsigned int tmp = (val & 0xfff) << 16 | 223be242261SPeter Zijlstra (val & 0xff000) >> 4 | (*(unsigned int *) loc & 0xf00000ff); 224be242261SPeter Zijlstra write(dest, &tmp, 4); 225be242261SPeter Zijlstra } else if (bits == 32) { 226be242261SPeter Zijlstra unsigned int tmp = val; 227be242261SPeter Zijlstra write(dest, &tmp, 4); 228be242261SPeter Zijlstra } else if (bits == 64) { 229be242261SPeter Zijlstra unsigned long tmp = val; 230be242261SPeter Zijlstra write(dest, &tmp, 8); 231be242261SPeter Zijlstra } 232083e14c0SMartin Schwidefsky return 0; 233083e14c0SMartin Schwidefsky } 234083e14c0SMartin Schwidefsky 235083e14c0SMartin Schwidefsky static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, 236be242261SPeter Zijlstra const char *strtab, struct module *me, 237be242261SPeter Zijlstra void *(*write)(void *dest, const void *src, size_t len)) 2381da177e4SLinus Torvalds { 2391da177e4SLinus Torvalds struct mod_arch_syminfo *info; 2401da177e4SLinus Torvalds Elf_Addr loc, val; 2411da177e4SLinus Torvalds int r_type, r_sym; 24272a6b43eSHeiko Carstens int rc = -ENOEXEC; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds /* This is where to make the change */ 2451da177e4SLinus Torvalds loc = base + rela->r_offset; 2461da177e4SLinus Torvalds /* This is the symbol it is referring to. Note that all 2471da177e4SLinus Torvalds undefined symbols have been resolved. */ 2481da177e4SLinus Torvalds r_sym = ELF_R_SYM(rela->r_info); 2491da177e4SLinus Torvalds r_type = ELF_R_TYPE(rela->r_info); 2501da177e4SLinus Torvalds info = me->arch.syminfo + r_sym; 2511da177e4SLinus Torvalds val = symtab[r_sym].st_value; 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds switch (r_type) { 254e80cfc31SHendrik Brueckner case R_390_NONE: /* No relocation. */ 255e80cfc31SHendrik Brueckner rc = 0; 256e80cfc31SHendrik Brueckner break; 2571da177e4SLinus Torvalds case R_390_8: /* Direct 8 bit. */ 2581da177e4SLinus Torvalds case R_390_12: /* Direct 12 bit. */ 2591da177e4SLinus Torvalds case R_390_16: /* Direct 16 bit. */ 2601da177e4SLinus Torvalds case R_390_20: /* Direct 20 bit. */ 2611da177e4SLinus Torvalds case R_390_32: /* Direct 32 bit. */ 2621da177e4SLinus Torvalds case R_390_64: /* Direct 64 bit. */ 2631da177e4SLinus Torvalds val += rela->r_addend; 2641da177e4SLinus Torvalds if (r_type == R_390_8) 265be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 8, 0, write); 2661da177e4SLinus Torvalds else if (r_type == R_390_12) 267be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 12, 0, write); 2681da177e4SLinus Torvalds else if (r_type == R_390_16) 269be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 16, 0, write); 2701da177e4SLinus Torvalds else if (r_type == R_390_20) 271be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 20, 0, write); 2721da177e4SLinus Torvalds else if (r_type == R_390_32) 273be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 32, 0, write); 2741da177e4SLinus Torvalds else if (r_type == R_390_64) 275be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 64, 0, write); 2761da177e4SLinus Torvalds break; 2771da177e4SLinus Torvalds case R_390_PC16: /* PC relative 16 bit. */ 2781da177e4SLinus Torvalds case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */ 2791da177e4SLinus Torvalds case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */ 2801da177e4SLinus Torvalds case R_390_PC32: /* PC relative 32 bit. */ 2811da177e4SLinus Torvalds case R_390_PC64: /* PC relative 64 bit. */ 2821da177e4SLinus Torvalds val += rela->r_addend - loc; 2831da177e4SLinus Torvalds if (r_type == R_390_PC16) 284be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 16, 0, write); 2851da177e4SLinus Torvalds else if (r_type == R_390_PC16DBL) 286be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 16, 1, write); 2871da177e4SLinus Torvalds else if (r_type == R_390_PC32DBL) 288be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 32, 1, write); 2891da177e4SLinus Torvalds else if (r_type == R_390_PC32) 290be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 32, 0, write); 2911da177e4SLinus Torvalds else if (r_type == R_390_PC64) 292be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 64, 0, write); 2931da177e4SLinus Torvalds break; 2941da177e4SLinus Torvalds case R_390_GOT12: /* 12 bit GOT offset. */ 2951da177e4SLinus Torvalds case R_390_GOT16: /* 16 bit GOT offset. */ 2961da177e4SLinus Torvalds case R_390_GOT20: /* 20 bit GOT offset. */ 2971da177e4SLinus Torvalds case R_390_GOT32: /* 32 bit GOT offset. */ 2981da177e4SLinus Torvalds case R_390_GOT64: /* 64 bit GOT offset. */ 2991da177e4SLinus Torvalds case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */ 3001da177e4SLinus Torvalds case R_390_GOTPLT12: /* 12 bit offset to jump slot. */ 3011da177e4SLinus Torvalds case R_390_GOTPLT20: /* 20 bit offset to jump slot. */ 3021da177e4SLinus Torvalds case R_390_GOTPLT16: /* 16 bit offset to jump slot. */ 3031da177e4SLinus Torvalds case R_390_GOTPLT32: /* 32 bit offset to jump slot. */ 3041da177e4SLinus Torvalds case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ 3051da177e4SLinus Torvalds case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ 3061da177e4SLinus Torvalds if (info->got_initialized == 0) { 307be242261SPeter Zijlstra Elf_Addr *gotent = me->core_layout.base + 308be242261SPeter Zijlstra me->arch.got_offset + 3091da177e4SLinus Torvalds info->got_offset; 310be242261SPeter Zijlstra 311be242261SPeter Zijlstra write(gotent, &val, sizeof(*gotent)); 3121da177e4SLinus Torvalds info->got_initialized = 1; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds val = info->got_offset + rela->r_addend; 3151da177e4SLinus Torvalds if (r_type == R_390_GOT12 || 3161da177e4SLinus Torvalds r_type == R_390_GOTPLT12) 317be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 12, 0, write); 3181da177e4SLinus Torvalds else if (r_type == R_390_GOT16 || 3191da177e4SLinus Torvalds r_type == R_390_GOTPLT16) 320be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 16, 0, write); 3211da177e4SLinus Torvalds else if (r_type == R_390_GOT20 || 3221da177e4SLinus Torvalds r_type == R_390_GOTPLT20) 323be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 20, 0, write); 3241da177e4SLinus Torvalds else if (r_type == R_390_GOT32 || 3251da177e4SLinus Torvalds r_type == R_390_GOTPLT32) 326be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 32, 0, write); 3271da177e4SLinus Torvalds else if (r_type == R_390_GOT64 || 3281da177e4SLinus Torvalds r_type == R_390_GOTPLT64) 329be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 64, 0, write); 330083e14c0SMartin Schwidefsky else if (r_type == R_390_GOTENT || 331083e14c0SMartin Schwidefsky r_type == R_390_GOTPLTENT) { 3327523e4dcSRusty Russell val += (Elf_Addr) me->core_layout.base - loc; 333be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 32, 1, write); 334083e14c0SMartin Schwidefsky } 3351da177e4SLinus Torvalds break; 3361da177e4SLinus Torvalds case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ 3371da177e4SLinus Torvalds case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ 3381da177e4SLinus Torvalds case R_390_PLT32: /* 32 bit PC relative PLT address. */ 3391da177e4SLinus Torvalds case R_390_PLT64: /* 64 bit PC relative PLT address. */ 3401da177e4SLinus Torvalds case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ 3411da177e4SLinus Torvalds case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ 3421da177e4SLinus Torvalds case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ 3431da177e4SLinus Torvalds if (info->plt_initialized == 0) { 344*f3b7e73bSIlya Leoshkevich unsigned char insn[PLT_ENTRY_SIZE]; 345*f3b7e73bSIlya Leoshkevich char *plt_base; 346*f3b7e73bSIlya Leoshkevich char *ip; 347be242261SPeter Zijlstra 348*f3b7e73bSIlya Leoshkevich plt_base = me->core_layout.base + me->arch.plt_offset; 349*f3b7e73bSIlya Leoshkevich ip = plt_base + info->plt_offset; 350*f3b7e73bSIlya Leoshkevich *(int *)insn = 0x0d10e310; /* basr 1,0 */ 351*f3b7e73bSIlya Leoshkevich *(int *)&insn[4] = 0x100c0004; /* lg 1,12(1) */ 3526e179d64SMartin Schwidefsky if (IS_ENABLED(CONFIG_EXPOLINE) && !nospec_disable) { 353*f3b7e73bSIlya Leoshkevich char *jump_r1; 354*f3b7e73bSIlya Leoshkevich 355*f3b7e73bSIlya Leoshkevich jump_r1 = plt_base + me->arch.plt_size - 356*f3b7e73bSIlya Leoshkevich PLT_ENTRY_SIZE; 357*f3b7e73bSIlya Leoshkevich /* brcl 0xf,__jump_r1 */ 358*f3b7e73bSIlya Leoshkevich *(short *)&insn[8] = 0xc0f4; 359*f3b7e73bSIlya Leoshkevich *(int *)&insn[10] = (jump_r1 - (ip + 8)) / 2; 360f19fbd5eSMartin Schwidefsky } else { 361*f3b7e73bSIlya Leoshkevich *(int *)&insn[8] = 0x07f10000; /* br %r1 */ 362f19fbd5eSMartin Schwidefsky } 363*f3b7e73bSIlya Leoshkevich *(long *)&insn[14] = val; 364be242261SPeter Zijlstra 365be242261SPeter Zijlstra write(ip, insn, sizeof(insn)); 3661da177e4SLinus Torvalds info->plt_initialized = 1; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds if (r_type == R_390_PLTOFF16 || 369504665a9SMartin Schwidefsky r_type == R_390_PLTOFF32 || 370504665a9SMartin Schwidefsky r_type == R_390_PLTOFF64) 3711da177e4SLinus Torvalds val = me->arch.plt_offset - me->arch.got_offset + 3721da177e4SLinus Torvalds info->plt_offset + rela->r_addend; 373504665a9SMartin Schwidefsky else { 374504665a9SMartin Schwidefsky if (!((r_type == R_390_PLT16DBL && 375504665a9SMartin Schwidefsky val - loc + 0xffffUL < 0x1ffffeUL) || 376504665a9SMartin Schwidefsky (r_type == R_390_PLT32DBL && 377504665a9SMartin Schwidefsky val - loc + 0xffffffffULL < 0x1fffffffeULL))) 3787523e4dcSRusty Russell val = (Elf_Addr) me->core_layout.base + 379504665a9SMartin Schwidefsky me->arch.plt_offset + 380504665a9SMartin Schwidefsky info->plt_offset; 381504665a9SMartin Schwidefsky val += rela->r_addend - loc; 382504665a9SMartin Schwidefsky } 3831da177e4SLinus Torvalds if (r_type == R_390_PLT16DBL) 384be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 16, 1, write); 3851da177e4SLinus Torvalds else if (r_type == R_390_PLTOFF16) 386be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 16, 0, write); 3871da177e4SLinus Torvalds else if (r_type == R_390_PLT32DBL) 388be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 32, 1, write); 3891da177e4SLinus Torvalds else if (r_type == R_390_PLT32 || 3901da177e4SLinus Torvalds r_type == R_390_PLTOFF32) 391be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 32, 0, write); 3921da177e4SLinus Torvalds else if (r_type == R_390_PLT64 || 3931da177e4SLinus Torvalds r_type == R_390_PLTOFF64) 394be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 64, 0, write); 3951da177e4SLinus Torvalds break; 3961da177e4SLinus Torvalds case R_390_GOTOFF16: /* 16 bit offset to GOT. */ 3971da177e4SLinus Torvalds case R_390_GOTOFF32: /* 32 bit offset to GOT. */ 3981da177e4SLinus Torvalds case R_390_GOTOFF64: /* 64 bit offset to GOT. */ 3991da177e4SLinus Torvalds val = val + rela->r_addend - 4007523e4dcSRusty Russell ((Elf_Addr) me->core_layout.base + me->arch.got_offset); 4011da177e4SLinus Torvalds if (r_type == R_390_GOTOFF16) 402be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 16, 0, write); 4031da177e4SLinus Torvalds else if (r_type == R_390_GOTOFF32) 404be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 32, 0, write); 4051da177e4SLinus Torvalds else if (r_type == R_390_GOTOFF64) 406be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 0, 64, 0, write); 4071da177e4SLinus Torvalds break; 4081da177e4SLinus Torvalds case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */ 4091da177e4SLinus Torvalds case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */ 4107523e4dcSRusty Russell val = (Elf_Addr) me->core_layout.base + me->arch.got_offset + 4111da177e4SLinus Torvalds rela->r_addend - loc; 4121da177e4SLinus Torvalds if (r_type == R_390_GOTPC) 413be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 32, 0, write); 4141da177e4SLinus Torvalds else if (r_type == R_390_GOTPCDBL) 415be242261SPeter Zijlstra rc = apply_rela_bits(loc, val, 1, 32, 1, write); 4161da177e4SLinus Torvalds break; 4171da177e4SLinus Torvalds case R_390_COPY: 4181da177e4SLinus Torvalds case R_390_GLOB_DAT: /* Create GOT entry. */ 4191da177e4SLinus Torvalds case R_390_JMP_SLOT: /* Create PLT entry. */ 4201da177e4SLinus Torvalds case R_390_RELATIVE: /* Adjust by program base. */ 4211da177e4SLinus Torvalds /* Only needed if we want to support loading of 4221da177e4SLinus Torvalds modules linked with -shared. */ 423083e14c0SMartin Schwidefsky return -ENOEXEC; 4241da177e4SLinus Torvalds default: 425083e14c0SMartin Schwidefsky printk(KERN_ERR "module %s: unknown relocation: %u\n", 4261da177e4SLinus Torvalds me->name, r_type); 4271da177e4SLinus Torvalds return -ENOEXEC; 4281da177e4SLinus Torvalds } 429083e14c0SMartin Schwidefsky if (rc) { 430083e14c0SMartin Schwidefsky printk(KERN_ERR "module %s: relocation error for symbol %s " 431083e14c0SMartin Schwidefsky "(r_type %i, value 0x%lx)\n", 432083e14c0SMartin Schwidefsky me->name, strtab + symtab[r_sym].st_name, 433083e14c0SMartin Schwidefsky r_type, (unsigned long) val); 434083e14c0SMartin Schwidefsky return rc; 435083e14c0SMartin Schwidefsky } 4361da177e4SLinus Torvalds return 0; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 439be242261SPeter Zijlstra static int __apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, 4401da177e4SLinus Torvalds unsigned int symindex, unsigned int relsec, 441be242261SPeter Zijlstra struct module *me, 442be242261SPeter Zijlstra void *(*write)(void *dest, const void *src, size_t len)) 4431da177e4SLinus Torvalds { 4441da177e4SLinus Torvalds Elf_Addr base; 4451da177e4SLinus Torvalds Elf_Sym *symtab; 4461da177e4SLinus Torvalds Elf_Rela *rela; 4471da177e4SLinus Torvalds unsigned long i, n; 4481da177e4SLinus Torvalds int rc; 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds DEBUGP("Applying relocate section %u to %u\n", 4511da177e4SLinus Torvalds relsec, sechdrs[relsec].sh_info); 4521da177e4SLinus Torvalds base = sechdrs[sechdrs[relsec].sh_info].sh_addr; 4531da177e4SLinus Torvalds symtab = (Elf_Sym *) sechdrs[symindex].sh_addr; 4541da177e4SLinus Torvalds rela = (Elf_Rela *) sechdrs[relsec].sh_addr; 4551da177e4SLinus Torvalds n = sechdrs[relsec].sh_size / sizeof(Elf_Rela); 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds for (i = 0; i < n; i++, rela++) { 458be242261SPeter Zijlstra rc = apply_rela(rela, base, symtab, strtab, me, write); 4591da177e4SLinus Torvalds if (rc) 4601da177e4SLinus Torvalds return rc; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds return 0; 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds 465be242261SPeter Zijlstra int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, 466be242261SPeter Zijlstra unsigned int symindex, unsigned int relsec, 467be242261SPeter Zijlstra struct module *me) 468be242261SPeter Zijlstra { 469be242261SPeter Zijlstra bool early = me->state == MODULE_STATE_UNFORMED; 470be242261SPeter Zijlstra void *(*write)(void *, const void *, size_t) = memcpy; 471be242261SPeter Zijlstra 472be242261SPeter Zijlstra if (!early) 473be242261SPeter Zijlstra write = s390_kernel_write; 474be242261SPeter Zijlstra 475be242261SPeter Zijlstra return __apply_relocate_add(sechdrs, strtab, symindex, relsec, me, 476be242261SPeter Zijlstra write); 477be242261SPeter Zijlstra } 478be242261SPeter Zijlstra 479de5012b4SIlya Leoshkevich #ifdef CONFIG_FUNCTION_TRACER 480de5012b4SIlya Leoshkevich static int module_alloc_ftrace_hotpatch_trampolines(struct module *me, 481de5012b4SIlya Leoshkevich const Elf_Shdr *s) 482de5012b4SIlya Leoshkevich { 483de5012b4SIlya Leoshkevich char *start, *end; 484de5012b4SIlya Leoshkevich int numpages; 485de5012b4SIlya Leoshkevich size_t size; 486de5012b4SIlya Leoshkevich 487de5012b4SIlya Leoshkevich size = FTRACE_HOTPATCH_TRAMPOLINES_SIZE(s->sh_size); 488de5012b4SIlya Leoshkevich numpages = DIV_ROUND_UP(size, PAGE_SIZE); 489de5012b4SIlya Leoshkevich start = module_alloc(numpages * PAGE_SIZE); 490de5012b4SIlya Leoshkevich if (!start) 491de5012b4SIlya Leoshkevich return -ENOMEM; 492de5012b4SIlya Leoshkevich set_memory_ro((unsigned long)start, numpages); 493de5012b4SIlya Leoshkevich end = start + size; 494de5012b4SIlya Leoshkevich 495de5012b4SIlya Leoshkevich me->arch.trampolines_start = (struct ftrace_hotpatch_trampoline *)start; 496de5012b4SIlya Leoshkevich me->arch.trampolines_end = (struct ftrace_hotpatch_trampoline *)end; 497de5012b4SIlya Leoshkevich me->arch.next_trampoline = me->arch.trampolines_start; 498de5012b4SIlya Leoshkevich 499de5012b4SIlya Leoshkevich return 0; 500de5012b4SIlya Leoshkevich } 501de5012b4SIlya Leoshkevich #endif /* CONFIG_FUNCTION_TRACER */ 502de5012b4SIlya Leoshkevich 5031da177e4SLinus Torvalds int module_finalize(const Elf_Ehdr *hdr, 5041da177e4SLinus Torvalds const Elf_Shdr *sechdrs, 5051da177e4SLinus Torvalds struct module *me) 5061da177e4SLinus Torvalds { 507686140a1SVasily Gorbik const Elf_Shdr *s; 508f19fbd5eSMartin Schwidefsky char *secstrings, *secname; 509f19fbd5eSMartin Schwidefsky void *aseg; 510de5012b4SIlya Leoshkevich #ifdef CONFIG_FUNCTION_TRACER 511de5012b4SIlya Leoshkevich int ret; 512de5012b4SIlya Leoshkevich #endif 513f19fbd5eSMartin Schwidefsky 514f19fbd5eSMartin Schwidefsky if (IS_ENABLED(CONFIG_EXPOLINE) && 5156e179d64SMartin Schwidefsky !nospec_disable && me->arch.plt_size) { 516f19fbd5eSMartin Schwidefsky unsigned int *ij; 517f19fbd5eSMartin Schwidefsky 518f19fbd5eSMartin Schwidefsky ij = me->core_layout.base + me->arch.plt_offset + 519f19fbd5eSMartin Schwidefsky me->arch.plt_size - PLT_ENTRY_SIZE; 520f19fbd5eSMartin Schwidefsky if (test_facility(35)) { 521f19fbd5eSMartin Schwidefsky ij[0] = 0xc6000000; /* exrl %r0,.+10 */ 522f19fbd5eSMartin Schwidefsky ij[1] = 0x0005a7f4; /* j . */ 523f19fbd5eSMartin Schwidefsky ij[2] = 0x000007f1; /* br %r1 */ 524f19fbd5eSMartin Schwidefsky } else { 525f19fbd5eSMartin Schwidefsky ij[0] = 0x44000000 | (unsigned int) 526f19fbd5eSMartin Schwidefsky offsetof(struct lowcore, br_r1_trampoline); 527f19fbd5eSMartin Schwidefsky ij[1] = 0xa7f40000; /* j . */ 528f19fbd5eSMartin Schwidefsky } 529f19fbd5eSMartin Schwidefsky } 530686140a1SVasily Gorbik 531686140a1SVasily Gorbik secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 532686140a1SVasily Gorbik for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 533f19fbd5eSMartin Schwidefsky aseg = (void *) s->sh_addr; 534f19fbd5eSMartin Schwidefsky secname = secstrings + s->sh_name; 535686140a1SVasily Gorbik 536f19fbd5eSMartin Schwidefsky if (!strcmp(".altinstructions", secname)) 537f19fbd5eSMartin Schwidefsky /* patch .altinstructions */ 538686140a1SVasily Gorbik apply_alternatives(aseg, aseg + s->sh_size); 539f19fbd5eSMartin Schwidefsky 540f19fbd5eSMartin Schwidefsky if (IS_ENABLED(CONFIG_EXPOLINE) && 541b29cd7c4SVasily Gorbik (str_has_prefix(secname, ".s390_indirect"))) 5426e179d64SMartin Schwidefsky nospec_revert(aseg, aseg + s->sh_size); 543f19fbd5eSMartin Schwidefsky 544f19fbd5eSMartin Schwidefsky if (IS_ENABLED(CONFIG_EXPOLINE) && 545b29cd7c4SVasily Gorbik (str_has_prefix(secname, ".s390_return"))) 5466e179d64SMartin Schwidefsky nospec_revert(aseg, aseg + s->sh_size); 547de5012b4SIlya Leoshkevich 548de5012b4SIlya Leoshkevich #ifdef CONFIG_FUNCTION_TRACER 549de5012b4SIlya Leoshkevich if (!strcmp(FTRACE_CALLSITE_SECTION, secname)) { 550de5012b4SIlya Leoshkevich ret = module_alloc_ftrace_hotpatch_trampolines(me, s); 551de5012b4SIlya Leoshkevich if (ret < 0) 552de5012b4SIlya Leoshkevich return ret; 553de5012b4SIlya Leoshkevich } 554de5012b4SIlya Leoshkevich #endif /* CONFIG_FUNCTION_TRACER */ 555686140a1SVasily Gorbik } 556686140a1SVasily Gorbik 5576f367769SHeiko Carstens jump_label_apply_nops(me); 5585336377dSLinus Torvalds return 0; 5591da177e4SLinus Torvalds } 560