/* * Kernel module help for s390. * * S390 version * Copyright IBM Corp. 2002, 2003 * Author(s): Arnd Bergmann (arndb@de.ibm.com) * Martin Schwidefsky (schwidefsky@de.ibm.com) * * based on i386 version * Copyright (C) 2001 Rusty Russell. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */#include <linux/module.h>#include <linux/elf.h>#include <linux/vmalloc.h>#include <linux/fs.h>#include <linux/string.h>#include <linux/kernel.h>#include <linux/moduleloader.h>#include <linux/bug.h> #if 0#define DEBUGP printk#else#define DEBUGP(fmt , ...)#endif #ifndef CONFIG_64BIT#define PLT_ENTRY_SIZE 12#else /* CONFIG_64BIT */#define PLT_ENTRY_SIZE 20#endif /* CONFIG_64BIT */ #ifdef CONFIG_64BITvoid *module_alloc(unsigned long size){ if (PAGE_ALIGN(size) > MODULES_LEN) return NULL; return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, GFP_KERNEL, PAGE_KERNEL, NUMA_NO_NODE, __builtin_return_address(0));}#endif /* Free memory returned from module_alloc */void module_free(struct module *mod, void *module_region){ if (mod) { vfree(mod->arch.syminfo); mod->arch.syminfo = NULL; } vfree(module_region);} static void check_rela(Elf_Rela *rela, struct module *me){ struct mod_arch_syminfo *info; info = me->arch.syminfo + ELF_R_SYM (rela->r_info); switch (ELF_R_TYPE (rela->r_info)) { case R_390_GOT12: /* 12 bit GOT offset. */ case R_390_GOT16: /* 16 bit GOT offset. */ case R_390_GOT20: /* 20 bit GOT offset. */ case R_390_GOT32: /* 32 bit GOT offset. */ case R_390_GOT64: /* 64 bit GOT offset. */ case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */ case R_390_GOTPLT12: /* 12 bit offset to jump slot. */ case R_390_GOTPLT16: /* 16 bit offset to jump slot. */ case R_390_GOTPLT20: /* 20 bit offset to jump slot. */ case R_390_GOTPLT32: /* 32 bit offset to jump slot. */ case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ if (info->got_offset == -1UL) { info->got_offset = me->arch.got_size; me->arch.got_size += sizeof(void*); } break; case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ case R_390_PLT32: /* 32 bit PC relative PLT address. */ case R_390_PLT64: /* 64 bit PC relative PLT address. */ case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ if (info->plt_offset == -1UL) { info->plt_offset = me->arch.plt_size; me->arch.plt_size += PLT_ENTRY_SIZE; } break; case R_390_COPY: case R_390_GLOB_DAT: case R_390_JMP_SLOT: case R_390_RELATIVE: /* Only needed if we want to support loading of modules linked with -shared. */ break; }} /* * Account for GOT and PLT relocations. We can't add sections for * got and plt but we can increase the core module size. */int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, char *secstrings, struct module *me){ Elf_Shdr *symtab; Elf_Sym *symbols; Elf_Rela *rela; char *strings; int nrela, i, j; /* Find symbol table and string table. */ symtab = NULL; for (i = 0; i < hdr->e_shnum; i++) switch (sechdrs[i].sh_type) { case SHT_SYMTAB: symtab = sechdrs + i; break; } if (!symtab) { printk(KERN_ERR "module %s: no symbol table\n", me->name); return -ENOEXEC; } /* Allocate one syminfo structure per symbol. */ me->arch.nsyms = symtab->sh_size / sizeof(Elf_Sym); me->arch.syminfo = vmalloc(me->arch.nsyms * sizeof(struct mod_arch_syminfo)); if (!me->arch.syminfo) return -ENOMEM; symbols = (void *) hdr + symtab->sh_offset; strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset; for (i = 0; i < me->arch.nsyms; i++) { if (symbols[i].st_shndx == SHN_UNDEF && strcmp(strings + symbols[i].st_name, "_GLOBAL_OFFSET_TABLE_") == 0) /* "Define" it as absolute. */ symbols[i].st_shndx = SHN_ABS; me->arch.syminfo[i].got_offset = -1UL; me->arch.syminfo[i].plt_offset = -1UL; me->arch.syminfo[i].got_initialized = 0; me->arch.syminfo[i].plt_initialized = 0; } /* Search for got/plt relocations. */ me->arch.got_size = me->arch.plt_size = 0; for (i = 0; i < hdr->e_shnum; i++) { if (sechdrs[i].sh_type != SHT_RELA) continue; nrela = sechdrs[i].sh_size / sizeof(Elf_Rela); rela = (void *) hdr + sechdrs[i].sh_offset; for (j = 0; j < nrela; j++) check_rela(rela + j, me); } /* Increase core size by size of got & plt and set start offsets for got and plt. */ me->core_size = ALIGN(me->core_size, 4); me->arch.got_offset = me->core_size; me->core_size += me->arch.got_size; me->arch.plt_offset = me->core_size; me->core_size += me->arch.plt_size; return 0;} static int apply_rela_bits(Elf_Addr loc, Elf_Addr val, int sign, int bits, int shift){ unsigned long umax; long min, max; if (val & ((1UL << shift) - 1)) return -ENOEXEC; if (sign) { val = (Elf_Addr)(((long) val) >> shift); min = -(1L << (bits - 1)); max = (1L << (bits - 1)) - 1; if ((long) val < min || (long) val > max) return -ENOEXEC; } else { val >>= shift; umax = ((1UL << (bits - 1)) << 1) - 1; if ((unsigned long) val > umax) return -ENOEXEC; } if (bits == 8) *(unsigned char *) loc = val; else if (bits == 12) *(unsigned short *) loc = (val & 0xfff) | (*(unsigned short *) loc & 0xf000); else if (bits == 16) *(unsigned short *) loc = val; else if (bits == 20) *(unsigned int *) loc = (val & 0xfff) << 16 | (val & 0xff000) >> 4 | (*(unsigned int *) loc & 0xf00000ff); else if (bits == 32) *(unsigned int *) loc = val; else if (bits == 64) *(unsigned long *) loc = val; return 0;} static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab, const char *strtab, struct module *me){ struct mod_arch_syminfo *info; Elf_Addr loc, val; int r_type, r_sym; int rc = -ENOEXEC; /* This is where to make the change */ loc = base + rela->r_offset; /* This is the symbol it is referring to. Note that all undefined symbols have been resolved. */ r_sym = ELF_R_SYM(rela->r_info); r_type = ELF_R_TYPE(rela->r_info); info = me->arch.syminfo + r_sym; val = symtab[r_sym].st_value; switch (r_type) { case R_390_NONE: /* No relocation. */ rc = 0; break; case R_390_8: /* Direct 8 bit. */ case R_390_12: /* Direct 12 bit. */ case R_390_16: /* Direct 16 bit. */ case R_390_20: /* Direct 20 bit. */ case R_390_32: /* Direct 32 bit. */ case R_390_64: /* Direct 64 bit. */ val += rela->r_addend; if (r_type == R_390_8) rc = apply_rela_bits(loc, val, 0, 8, 0); else if (r_type == R_390_12) rc = apply_rela_bits(loc, val, 0, 12, 0); else if (r_type == R_390_16) rc = apply_rela_bits(loc, val, 0, 16, 0); else if (r_type == R_390_20) rc = apply_rela_bits(loc, val, 1, 20, 0); else if (r_type == R_390_32) rc = apply_rela_bits(loc, val, 0, 32, 0); else if (r_type == R_390_64) rc = apply_rela_bits(loc, val, 0, 64, 0); break; case R_390_PC16: /* PC relative 16 bit. */ case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */ case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */ case R_390_PC32: /* PC relative 32 bit. */ case R_390_PC64: /* PC relative 64 bit. */ val += rela->r_addend - loc; if (r_type == R_390_PC16) rc = apply_rela_bits(loc, val, 1, 16, 0); else if (r_type == R_390_PC16DBL) rc = apply_rela_bits(loc, val, 1, 16, 1); else if (r_type == R_390_PC32DBL) rc = apply_rela_bits(loc, val, 1, 32, 1); else if (r_type == R_390_PC32) rc = apply_rela_bits(loc, val, 1, 32, 0); else if (r_type == R_390_PC64) rc = apply_rela_bits(loc, val, 1, 64, 0); break; case R_390_GOT12: /* 12 bit GOT offset. */ case R_390_GOT16: /* 16 bit GOT offset. */ case R_390_GOT20: /* 20 bit GOT offset. */ case R_390_GOT32: /* 32 bit GOT offset. */ case R_390_GOT64: /* 64 bit GOT offset. */ case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */ case R_390_GOTPLT12: /* 12 bit offset to jump slot. */ case R_390_GOTPLT20: /* 20 bit offset to jump slot. */ case R_390_GOTPLT16: /* 16 bit offset to jump slot. */ case R_390_GOTPLT32: /* 32 bit offset to jump slot. */ case R_390_GOTPLT64: /* 64 bit offset to jump slot. */ case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */ if (info->got_initialized == 0) { Elf_Addr *gotent; gotent = me->module_core + me->arch.got_offset + info->got_offset; *gotent = val; info->got_initialized = 1; } val = info->got_offset + rela->r_addend; if (r_type == R_390_GOT12 || r_type == R_390_GOTPLT12) rc = apply_rela_bits(loc, val, 0, 12, 0); else if (r_type == R_390_GOT16 || r_type == R_390_GOTPLT16) rc = apply_rela_bits(loc, val, 0, 16, 0); else if (r_type == R_390_GOT20 || r_type == R_390_GOTPLT20) rc = apply_rela_bits(loc, val, 1, 20, 0); else if (r_type == R_390_GOT32 || r_type == R_390_GOTPLT32) rc = apply_rela_bits(loc, val, 0, 32, 0); else if (r_type == R_390_GOT64 || r_type == R_390_GOTPLT64) rc = apply_rela_bits(loc, val, 0, 64, 0); else if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT) { val += (Elf_Addr) me->module_core - loc; rc = apply_rela_bits(loc, val, 1, 32, 1); } break; case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */ case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */ case R_390_PLT32: /* 32 bit PC relative PLT address. */ case R_390_PLT64: /* 64 bit PC relative PLT address. */ case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */ case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */ case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */ if (info->plt_initialized == 0) { unsigned int *ip; ip = me->module_core + me->arch.plt_offset + info->plt_offset;#ifndef CONFIG_64BIT ip[0] = 0x0d105810; /* basr 1,0; l 1,6(1); br 1 */ ip[1] = 0x100607f1; ip[2] = val;#else /* CONFIG_64BIT */ ip[0] = 0x0d10e310; /* basr 1,0; lg 1,10(1); br 1 */ ip[1] = 0x100a0004; ip[2] = 0x07f10000; ip[3] = (unsigned int) (val >> 32); ip[4] = (unsigned int) val;#endif /* CONFIG_64BIT */ info->plt_initialized = 1; } if (r_type == R_390_PLTOFF16 || r_type == R_390_PLTOFF32 || r_type == R_390_PLTOFF64) val = me->arch.plt_offset - me->arch.got_offset + info->plt_offset + rela->r_addend; else { if (!((r_type == R_390_PLT16DBL && val - loc + 0xffffUL < 0x1ffffeUL) || (r_type == R_390_PLT32DBL && val - loc + 0xffffffffULL < 0x1fffffffeULL))) val = (Elf_Addr) me->module_core + me->arch.plt_offset + info->plt_offset; val += rela->r_addend - loc; } if (r_type == R_390_PLT16DBL) rc = apply_rela_bits(loc, val, 1, 16, 1); else if (r_type == R_390_PLTOFF16) rc = apply_rela_bits(loc, val, 0, 16, 0); else if (r_type == R_390_PLT32DBL) rc = apply_rela_bits(loc, val, 1, 32, 1); else if (r_type == R_390_PLT32 || r_type == R_390_PLTOFF32) rc = apply_rela_bits(loc, val, 0, 32, 0); else if (r_type == R_390_PLT64 || r_type == R_390_PLTOFF64) rc = apply_rela_bits(loc, val, 0, 64, 0); break; case R_390_GOTOFF16: /* 16 bit offset to GOT. */ case R_390_GOTOFF32: /* 32 bit offset to GOT. */ case R_390_GOTOFF64: /* 64 bit offset to GOT. */ val = val + rela->r_addend - ((Elf_Addr) me->module_core + me->arch.got_offset); if (r_type == R_390_GOTOFF16) rc = apply_rela_bits(loc, val, 0, 16, 0); else if (r_type == R_390_GOTOFF32) rc = apply_rela_bits(loc, val, 0, 32, 0); else if (r_type == R_390_GOTOFF64) rc = apply_rela_bits(loc, val, 0, 64, 0); break; case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */ case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */ val = (Elf_Addr) me->module_core + me->arch.got_offset + rela->r_addend - loc; if (r_type == R_390_GOTPC) rc = apply_rela_bits(loc, val, 1, 32, 0); else if (r_type == R_390_GOTPCDBL) rc = apply_rela_bits(loc, val, 1, 32, 1); break; case R_390_COPY: case R_390_GLOB_DAT: /* Create GOT entry. */ case R_390_JMP_SLOT: /* Create PLT entry. */ case R_390_RELATIVE: /* Adjust by program base. */ /* Only needed if we want to support loading of modules linked with -shared. */ return -ENOEXEC; default: printk(KERN_ERR "module %s: unknown relocation: %u\n", me->name, r_type); return -ENOEXEC; } if (rc) { printk(KERN_ERR "module %s: relocation error for symbol %s " "(r_type %i, value 0x%lx)\n", me->name, strtab + symtab[r_sym].st_name, r_type, (unsigned long) val); return rc; } return 0;} int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *me){ Elf_Addr base; Elf_Sym *symtab; Elf_Rela *rela; unsigned long i, n; int rc; DEBUGP("Applying relocate section %u to %u\n", relsec, sechdrs[relsec].sh_info); base = sechdrs[sechdrs[relsec].sh_info].sh_addr; symtab = (Elf_Sym *) sechdrs[symindex].sh_addr; rela = (Elf_Rela *) sechdrs[relsec].sh_addr; n = sechdrs[relsec].sh_size / sizeof(Elf_Rela); for (i = 0; i < n; i++, rela++) { rc = apply_rela(rela, base, symtab, strtab, me); if (rc) return rc; } return 0;} int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *me){ vfree(me->arch.syminfo); me->arch.syminfo = NULL; return 0;}
/*
* Kernel module help for s390.
*
* S390 version
* Copyright IBM Corp. 2002, 2003
* Author(s): Arnd Bergmann (arndb@de.ibm.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* based on i386 version
* Copyright (C) 2001 Rusty Russell.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/moduleloader.h>
#include <linux/bug.h>
#if 0
#define DEBUGP printk
#else
#define DEBUGP(fmt , ...)
#endif
#ifndef CONFIG_64BIT
#define PLT_ENTRY_SIZE 12
#else /* CONFIG_64BIT */
#define PLT_ENTRY_SIZE 20
#endif /* CONFIG_64BIT */
#ifdef CONFIG_64BIT
void *module_alloc(unsigned long size)
{
if (PAGE_ALIGN(size) > MODULES_LEN)
return NULL;
return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
GFP_KERNEL, PAGE_KERNEL, NUMA_NO_NODE,
__builtin_return_address(0));
}
#endif
/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
if (mod) {
vfree(mod->arch.syminfo);
mod->arch.syminfo = NULL;
}
vfree(module_region);
}
static void check_rela(Elf_Rela *rela, struct module *me)
{
struct mod_arch_syminfo *info;
info = me->arch.syminfo + ELF_R_SYM (rela->r_info);
switch (ELF_R_TYPE (rela->r_info)) {
case R_390_GOT12: /* 12 bit GOT offset. */
case R_390_GOT16: /* 16 bit GOT offset. */
case R_390_GOT20: /* 20 bit GOT offset. */
case R_390_GOT32: /* 32 bit GOT offset. */
case R_390_GOT64: /* 64 bit GOT offset. */
case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
case R_390_GOTPLT20: /* 20 bit offset to jump slot. */
case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
case R_390_GOTPLT64: /* 64 bit offset to jump slot. */
case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
if (info->got_offset == -1UL) {
info->got_offset = me->arch.got_size;
me->arch.got_size += sizeof(void*);
}
break;
case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
case R_390_PLT32: /* 32 bit PC relative PLT address. */
case R_390_PLT64: /* 64 bit PC relative PLT address. */
case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */
if (info->plt_offset == -1UL) {
info->plt_offset = me->arch.plt_size;
me->arch.plt_size += PLT_ENTRY_SIZE;
}
break;
case R_390_COPY:
case R_390_GLOB_DAT:
case R_390_JMP_SLOT:
case R_390_RELATIVE:
/* Only needed if we want to support loading of
modules linked with -shared. */
break;
}
}
/*
* Account for GOT and PLT relocations. We can't add sections for
* got and plt but we can increase the core module size.
*/
int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
char *secstrings, struct module *me)
{
Elf_Shdr *symtab;
Elf_Sym *symbols;
Elf_Rela *rela;
char *strings;
int nrela, i, j;
/* Find symbol table and string table. */
symtab = NULL;
for (i = 0; i < hdr->e_shnum; i++)
switch (sechdrs[i].sh_type) {
case SHT_SYMTAB:
symtab = sechdrs + i;
break;
}
if (!symtab) {
printk(KERN_ERR "module %s: no symbol table\n", me->name);
return -ENOEXEC;
}
/* Allocate one syminfo structure per symbol. */
me->arch.nsyms = symtab->sh_size / sizeof(Elf_Sym);
me->arch.syminfo = vmalloc(me->arch.nsyms *
sizeof(struct mod_arch_syminfo));
if (!me->arch.syminfo)
return -ENOMEM;
symbols = (void *) hdr + symtab->sh_offset;
strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset;
for (i = 0; i < me->arch.nsyms; i++) {
if (symbols[i].st_shndx == SHN_UNDEF &&
strcmp(strings + symbols[i].st_name,
"_GLOBAL_OFFSET_TABLE_") == 0)
/* "Define" it as absolute. */
symbols[i].st_shndx = SHN_ABS;
me->arch.syminfo[i].got_offset = -1UL;
me->arch.syminfo[i].plt_offset = -1UL;
me->arch.syminfo[i].got_initialized = 0;
me->arch.syminfo[i].plt_initialized = 0;
}
/* Search for got/plt relocations. */
me->arch.got_size = me->arch.plt_size = 0;
for (i = 0; i < hdr->e_shnum; i++) {
if (sechdrs[i].sh_type != SHT_RELA)
continue;
nrela = sechdrs[i].sh_size / sizeof(Elf_Rela);
rela = (void *) hdr + sechdrs[i].sh_offset;
for (j = 0; j < nrela; j++)
check_rela(rela + j, me);
}
/* Increase core size by size of got & plt and set start
offsets for got and plt. */
me->core_size = ALIGN(me->core_size, 4);
me->arch.got_offset = me->core_size;
me->core_size += me->arch.got_size;
me->arch.plt_offset = me->core_size;
me->core_size += me->arch.plt_size;
return 0;
}
static int apply_rela_bits(Elf_Addr loc, Elf_Addr val,
int sign, int bits, int shift)
{
unsigned long umax;
long min, max;
if (val & ((1UL << shift) - 1))
return -ENOEXEC;
if (sign) {
val = (Elf_Addr)(((long) val) >> shift);
min = -(1L << (bits - 1));
max = (1L << (bits - 1)) - 1;
if ((long) val < min || (long) val > max)
return -ENOEXEC;
} else {
val >>= shift;
umax = ((1UL << (bits - 1)) << 1) - 1;
if ((unsigned long) val > umax)
return -ENOEXEC;
}
if (bits == 8)
*(unsigned char *) loc = val;
else if (bits == 12)
*(unsigned short *) loc = (val & 0xfff) |
(*(unsigned short *) loc & 0xf000);
else if (bits == 16)
*(unsigned short *) loc = val;
else if (bits == 20)
*(unsigned int *) loc = (val & 0xfff) << 16 |
(val & 0xff000) >> 4 |
(*(unsigned int *) loc & 0xf00000ff);
else if (bits == 32)
*(unsigned int *) loc = val;
else if (bits == 64)
*(unsigned long *) loc = val;
return 0;
}
static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab,
const char *strtab, struct module *me)
{
struct mod_arch_syminfo *info;
Elf_Addr loc, val;
int r_type, r_sym;
int rc = -ENOEXEC;
/* This is where to make the change */
loc = base + rela->r_offset;
/* This is the symbol it is referring to. Note that all
undefined symbols have been resolved. */
r_sym = ELF_R_SYM(rela->r_info);
r_type = ELF_R_TYPE(rela->r_info);
info = me->arch.syminfo + r_sym;
val = symtab[r_sym].st_value;
switch (r_type) {
case R_390_NONE: /* No relocation. */
rc = 0;
break;
case R_390_8: /* Direct 8 bit. */
case R_390_12: /* Direct 12 bit. */
case R_390_16: /* Direct 16 bit. */
case R_390_20: /* Direct 20 bit. */
case R_390_32: /* Direct 32 bit. */
case R_390_64: /* Direct 64 bit. */
val += rela->r_addend;
if (r_type == R_390_8)
rc = apply_rela_bits(loc, val, 0, 8, 0);
else if (r_type == R_390_12)
rc = apply_rela_bits(loc, val, 0, 12, 0);
else if (r_type == R_390_16)
rc = apply_rela_bits(loc, val, 0, 16, 0);
else if (r_type == R_390_20)
rc = apply_rela_bits(loc, val, 1, 20, 0);
else if (r_type == R_390_32)
rc = apply_rela_bits(loc, val, 0, 32, 0);
else if (r_type == R_390_64)
rc = apply_rela_bits(loc, val, 0, 64, 0);
break;
case R_390_PC16: /* PC relative 16 bit. */
case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */
case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */
case R_390_PC32: /* PC relative 32 bit. */
case R_390_PC64: /* PC relative 64 bit. */
val += rela->r_addend - loc;
if (r_type == R_390_PC16)
rc = apply_rela_bits(loc, val, 1, 16, 0);
else if (r_type == R_390_PC16DBL)
rc = apply_rela_bits(loc, val, 1, 16, 1);
else if (r_type == R_390_PC32DBL)
rc = apply_rela_bits(loc, val, 1, 32, 1);
else if (r_type == R_390_PC32)
rc = apply_rela_bits(loc, val, 1, 32, 0);
else if (r_type == R_390_PC64)
rc = apply_rela_bits(loc, val, 1, 64, 0);
break;
case R_390_GOT12: /* 12 bit GOT offset. */
case R_390_GOT16: /* 16 bit GOT offset. */
case R_390_GOT20: /* 20 bit GOT offset. */
case R_390_GOT32: /* 32 bit GOT offset. */
case R_390_GOT64: /* 64 bit GOT offset. */
case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
case R_390_GOTPLT20: /* 20 bit offset to jump slot. */
case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
case R_390_GOTPLT64: /* 64 bit offset to jump slot. */
case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
if (info->got_initialized == 0) {
Elf_Addr *gotent;
gotent = me->module_core + me->arch.got_offset +
info->got_offset;
*gotent = val;
info->got_initialized = 1;
}
val = info->got_offset + rela->r_addend;
if (r_type == R_390_GOT12 ||
r_type == R_390_GOTPLT12)
rc = apply_rela_bits(loc, val, 0, 12, 0);
else if (r_type == R_390_GOT16 ||
r_type == R_390_GOTPLT16)
rc = apply_rela_bits(loc, val, 0, 16, 0);
else if (r_type == R_390_GOT20 ||
r_type == R_390_GOTPLT20)
rc = apply_rela_bits(loc, val, 1, 20, 0);
else if (r_type == R_390_GOT32 ||
r_type == R_390_GOTPLT32)
rc = apply_rela_bits(loc, val, 0, 32, 0);
else if (r_type == R_390_GOT64 ||
r_type == R_390_GOTPLT64)
rc = apply_rela_bits(loc, val, 0, 64, 0);
else if (r_type == R_390_GOTENT ||
r_type == R_390_GOTPLTENT) {
val += (Elf_Addr) me->module_core - loc;
rc = apply_rela_bits(loc, val, 1, 32, 1);
}
break;
case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
case R_390_PLT32: /* 32 bit PC relative PLT address. */
case R_390_PLT64: /* 64 bit PC relative PLT address. */
case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */
if (info->plt_initialized == 0) {
unsigned int *ip;
ip = me->module_core + me->arch.plt_offset +
info->plt_offset;
#ifndef CONFIG_64BIT
ip[0] = 0x0d105810; /* basr 1,0; l 1,6(1); br 1 */
ip[1] = 0x100607f1;
ip[2] = val;
#else /* CONFIG_64BIT */
ip[0] = 0x0d10e310; /* basr 1,0; lg 1,10(1); br 1 */
ip[1] = 0x100a0004;
ip[2] = 0x07f10000;
ip[3] = (unsigned int) (val >> 32);
ip[4] = (unsigned int) val;
#endif /* CONFIG_64BIT */
info->plt_initialized = 1;
}
if (r_type == R_390_PLTOFF16 ||
r_type == R_390_PLTOFF32 ||
r_type == R_390_PLTOFF64)
val = me->arch.plt_offset - me->arch.got_offset +
info->plt_offset + rela->r_addend;
else {
if (!((r_type == R_390_PLT16DBL &&
val - loc + 0xffffUL < 0x1ffffeUL) ||
(r_type == R_390_PLT32DBL &&
val - loc + 0xffffffffULL < 0x1fffffffeULL)))
val = (Elf_Addr) me->module_core +
me->arch.plt_offset +
info->plt_offset;
val += rela->r_addend - loc;
}
if (r_type == R_390_PLT16DBL)
rc = apply_rela_bits(loc, val, 1, 16, 1);
else if (r_type == R_390_PLTOFF16)
rc = apply_rela_bits(loc, val, 0, 16, 0);
else if (r_type == R_390_PLT32DBL)
rc = apply_rela_bits(loc, val, 1, 32, 1);
else if (r_type == R_390_PLT32 ||
r_type == R_390_PLTOFF32)
rc = apply_rela_bits(loc, val, 0, 32, 0);
else if (r_type == R_390_PLT64 ||
r_type == R_390_PLTOFF64)
rc = apply_rela_bits(loc, val, 0, 64, 0);
break;
case R_390_GOTOFF16: /* 16 bit offset to GOT. */
case R_390_GOTOFF32: /* 32 bit offset to GOT. */
case R_390_GOTOFF64: /* 64 bit offset to GOT. */
val = val + rela->r_addend -
((Elf_Addr) me->module_core + me->arch.got_offset);
if (r_type == R_390_GOTOFF16)
rc = apply_rela_bits(loc, val, 0, 16, 0);
else if (r_type == R_390_GOTOFF32)
rc = apply_rela_bits(loc, val, 0, 32, 0);
else if (r_type == R_390_GOTOFF64)
rc = apply_rela_bits(loc, val, 0, 64, 0);
break;
case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */
case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */
val = (Elf_Addr) me->module_core + me->arch.got_offset +
rela->r_addend - loc;
if (r_type == R_390_GOTPC)
rc = apply_rela_bits(loc, val, 1, 32, 0);
else if (r_type == R_390_GOTPCDBL)
rc = apply_rela_bits(loc, val, 1, 32, 1);
break;
case R_390_COPY:
case R_390_GLOB_DAT: /* Create GOT entry. */
case R_390_JMP_SLOT: /* Create PLT entry. */
case R_390_RELATIVE: /* Adjust by program base. */
/* Only needed if we want to support loading of
modules linked with -shared. */
return -ENOEXEC;
default:
printk(KERN_ERR "module %s: unknown relocation: %u\n",
me->name, r_type);
return -ENOEXEC;
}
if (rc) {
printk(KERN_ERR "module %s: relocation error for symbol %s "
"(r_type %i, value 0x%lx)\n",
me->name, strtab + symtab[r_sym].st_name,
r_type, (unsigned long) val);
return rc;
}
return 0;
}
int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
unsigned int symindex, unsigned int relsec,
struct module *me)
{
Elf_Addr base;
Elf_Sym *symtab;
Elf_Rela *rela;
unsigned long i, n;
int rc;
DEBUGP("Applying relocate section %u to %u\n",
relsec, sechdrs[relsec].sh_info);
base = sechdrs[sechdrs[relsec].sh_info].sh_addr;
symtab = (Elf_Sym *) sechdrs[symindex].sh_addr;
rela = (Elf_Rela *) sechdrs[relsec].sh_addr;
n = sechdrs[relsec].sh_size / sizeof(Elf_Rela);
for (i = 0; i < n; i++, rela++) {
rc = apply_rela(rela, base, symtab, strtab, me);
if (rc)
return rc;
}
return 0;
}
int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *me)
{
vfree(me->arch.syminfo);
me->arch.syminfo = NULL;
return 0;
}