c0007f1a65
Generic bug implementation for s390. Will increase the value of the console output on BUG() statements since registers r0-r5,r14 will not be clobbered by a printk() call that was previously done before the illegal instruction of BUG() was hit. Also implements an architecture specific WARN_ON(). Output of that could be increased but requires common code change. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
409 lines
13 KiB
C
409 lines
13 KiB
C
/*
|
|
* arch/s390/kernel/module.c - Kernel module help for s390.
|
|
*
|
|
* S390 version
|
|
* Copyright (C) 2002, 2003 IBM Deutschland Entwicklung GmbH,
|
|
* IBM Corporation
|
|
* 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 */
|
|
|
|
void *module_alloc(unsigned long size)
|
|
{
|
|
if (size == 0)
|
|
return NULL;
|
|
return vmalloc(size);
|
|
}
|
|
|
|
/* Free memory returned from module_alloc */
|
|
void module_free(struct module *mod, void *module_region)
|
|
{
|
|
vfree(module_region);
|
|
/* FIXME: If module_region == mod->init_region, trim exception
|
|
table entries. */
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
int
|
|
apply_relocate(Elf_Shdr *sechdrs, const char *strtab, unsigned int symindex,
|
|
unsigned int relsec, struct module *me)
|
|
{
|
|
printk(KERN_ERR "module %s: RELOCATION unsupported\n",
|
|
me->name);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
static int
|
|
apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab,
|
|
struct module *me)
|
|
{
|
|
struct mod_arch_syminfo *info;
|
|
Elf_Addr loc, val;
|
|
int r_type, r_sym;
|
|
|
|
/* 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_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)
|
|
*(unsigned char *) loc = val;
|
|
else if (r_type == R_390_12)
|
|
*(unsigned short *) loc = (val & 0xfff) |
|
|
(*(unsigned short *) loc & 0xf000);
|
|
else if (r_type == R_390_16)
|
|
*(unsigned short *) loc = val;
|
|
else if (r_type == R_390_20)
|
|
*(unsigned int *) loc =
|
|
(*(unsigned int *) loc & 0xf00000ff) |
|
|
(val & 0xfff) << 16 | (val & 0xff000) >> 4;
|
|
else if (r_type == R_390_32)
|
|
*(unsigned int *) loc = val;
|
|
else if (r_type == R_390_64)
|
|
*(unsigned long *) loc = val;
|
|
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)
|
|
*(unsigned short *) loc = val;
|
|
else if (r_type == R_390_PC16DBL)
|
|
*(unsigned short *) loc = val >> 1;
|
|
else if (r_type == R_390_PC32DBL)
|
|
*(unsigned int *) loc = val >> 1;
|
|
else if (r_type == R_390_PC32)
|
|
*(unsigned int *) loc = val;
|
|
else if (r_type == R_390_PC64)
|
|
*(unsigned long *) loc = val;
|
|
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)
|
|
*(unsigned short *) loc = (val & 0xfff) |
|
|
(*(unsigned short *) loc & 0xf000);
|
|
else if (r_type == R_390_GOT16 ||
|
|
r_type == R_390_GOTPLT16)
|
|
*(unsigned short *) loc = val;
|
|
else if (r_type == R_390_GOT20 ||
|
|
r_type == R_390_GOTPLT20)
|
|
*(unsigned int *) loc =
|
|
(*(unsigned int *) loc & 0xf00000ff) |
|
|
(val & 0xfff) << 16 | (val & 0xff000) >> 4;
|
|
else if (r_type == R_390_GOT32 ||
|
|
r_type == R_390_GOTPLT32)
|
|
*(unsigned int *) loc = val;
|
|
else if (r_type == R_390_GOTENT ||
|
|
r_type == R_390_GOTPLTENT)
|
|
*(unsigned int *) loc =
|
|
(val + (Elf_Addr) me->module_core - loc) >> 1;
|
|
else if (r_type == R_390_GOT64 ||
|
|
r_type == R_390_GOTPLT64)
|
|
*(unsigned long *) loc = val;
|
|
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
|
|
val = (Elf_Addr) me->module_core +
|
|
me->arch.plt_offset + info->plt_offset +
|
|
rela->r_addend - loc;
|
|
if (r_type == R_390_PLT16DBL)
|
|
*(unsigned short *) loc = val >> 1;
|
|
else if (r_type == R_390_PLTOFF16)
|
|
*(unsigned short *) loc = val;
|
|
else if (r_type == R_390_PLT32DBL)
|
|
*(unsigned int *) loc = val >> 1;
|
|
else if (r_type == R_390_PLT32 ||
|
|
r_type == R_390_PLTOFF32)
|
|
*(unsigned int *) loc = val;
|
|
else if (r_type == R_390_PLT64 ||
|
|
r_type == R_390_PLTOFF64)
|
|
*(unsigned long *) loc = val;
|
|
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)
|
|
*(unsigned short *) loc = val;
|
|
else if (r_type == R_390_GOTOFF32)
|
|
*(unsigned int *) loc = val;
|
|
else if (r_type == R_390_GOTOFF64)
|
|
*(unsigned long *) loc = val;
|
|
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)
|
|
*(unsigned int *) loc = val;
|
|
else if (r_type == R_390_GOTPCDBL)
|
|
*(unsigned int *) loc = val >> 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. */
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "module %s: Unknown relocation: %u\n",
|
|
me->name, r_type);
|
|
return -ENOEXEC;
|
|
}
|
|
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, 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);
|
|
return module_bug_finalize(hdr, sechdrs, me);
|
|
}
|
|
|
|
void module_arch_cleanup(struct module *mod)
|
|
{
|
|
module_bug_cleanup(mod);
|
|
}
|