[mirror_ubuntu-artful-kernel.git] / arch / s390 / kernel / module.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>

#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 inline 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 inline 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 0;
}

void module_arch_cleanup(struct module *mod)
{
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/s390/kernel/module.c - Kernel module help for s390.
	3	*
	4	* S390 version
	5	* Copyright (C) 2002, 2003 IBM Deutschland Entwicklung GmbH,
	6	* IBM Corporation
	7	* Author(s): Arnd Bergmann (arndb@de.ibm.com)
	8	* Martin Schwidefsky (schwidefsky@de.ibm.com)
	9	*
	10	* based on i386 version
	11	* Copyright (C) 2001 Rusty Russell.
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, write to the Free Software
	25	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	26	*/
	27	#include <linux/module.h>
	28	#include <linux/elf.h>
	29	#include <linux/vmalloc.h>
	30	#include <linux/fs.h>
	31	#include <linux/string.h>
	32	#include <linux/kernel.h>
2b67fc46	33	#include <linux/moduleloader.h>
1da177e4 LT	34
	35	#if 0
	36	#define DEBUGP printk
	37	#else
	38	#define DEBUGP(fmt , ...)
	39	#endif
	40
347a8dc3	41	#ifndef CONFIG_64BIT
1da177e4	42	#define PLT_ENTRY_SIZE 12
347a8dc3	43	#else /* CONFIG_64BIT */
1da177e4	44	#define PLT_ENTRY_SIZE 20
347a8dc3	45	#endif /* CONFIG_64BIT */
1da177e4 LT	46
	47	void *module_alloc(unsigned long size)
	48	{
	49	if (size == 0)
	50	return NULL;
	51	return vmalloc(size);
	52	}
	53
	54	/* Free memory returned from module_alloc */
	55	void module_free(struct module mod, void module_region)
	56	{
	57	vfree(module_region);
	58	/* FIXME: If module_region == mod->init_region, trim exception
	59	table entries. */
	60	}
	61
	62	static inline void
	63	check_rela(Elf_Rela rela, struct module me)
	64	{
	65	struct mod_arch_syminfo *info;
	66
	67	info = me->arch.syminfo + ELF_R_SYM (rela->r_info);
	68	switch (ELF_R_TYPE (rela->r_info)) {
	69	case R_390_GOT12: /* 12 bit GOT offset. */
	70	case R_390_GOT16: /* 16 bit GOT offset. */
	71	case R_390_GOT20: /* 20 bit GOT offset. */
	72	case R_390_GOT32: /* 32 bit GOT offset. */
	73	case R_390_GOT64: /* 64 bit GOT offset. */
	74	case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
	75	case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
	76	case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
	77	case R_390_GOTPLT20: /* 20 bit offset to jump slot. */
	78	case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
	79	case R_390_GOTPLT64: /* 64 bit offset to jump slot. */
	80	case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
	81	if (info->got_offset == -1UL) {
	82	info->got_offset = me->arch.got_size;
	83	me->arch.got_size += sizeof(void*);
	84	}
	85	break;
	86	case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
	87	case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
	88	case R_390_PLT32: /* 32 bit PC relative PLT address. */
	89	case R_390_PLT64: /* 64 bit PC relative PLT address. */
	90	case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
	91	case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
	92	case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */
	93	if (info->plt_offset == -1UL) {
	94	info->plt_offset = me->arch.plt_size;
	95	me->arch.plt_size += PLT_ENTRY_SIZE;
	96	}
	97	break;
	98	case R_390_COPY:
	99	case R_390_GLOB_DAT:
	100	case R_390_JMP_SLOT:
	101	case R_390_RELATIVE:
	102	/* Only needed if we want to support loading of
	103	modules linked with -shared. */
	104	break;
	105	}
	106	}
	107
	108	/*
	109	* Account for GOT and PLT relocations. We can't add sections for
110	* got and plt but we can increase the core module size.
111	*/
112	int
113	module_frob_arch_sections(Elf_Ehdr hdr, Elf_Shdr sechdrs,
114	char secstrings, struct module me)
115	{
116	Elf_Shdr *symtab;
117	Elf_Sym *symbols;
118	Elf_Rela *rela;
119	char *strings;
120	int nrela, i, j;
121
122	/* Find symbol table and string table. */
d2c993d8	123	symtab = NULL;
1da177e4 LT	124	for (i = 0; i < hdr->e_shnum; i++)
	125	switch (sechdrs[i].sh_type) {
	126	case SHT_SYMTAB:
	127	symtab = sechdrs + i;
	128	break;
	129	}
	130	if (!symtab) {
	131	printk(KERN_ERR "module %s: no symbol table\n", me->name);
	132	return -ENOEXEC;
	133	}
	134
	135	/* Allocate one syminfo structure per symbol. */
	136	me->arch.nsyms = symtab->sh_size / sizeof(Elf_Sym);
	137	me->arch.syminfo = vmalloc(me->arch.nsyms *
	138	sizeof(struct mod_arch_syminfo));
	139	if (!me->arch.syminfo)
	140	return -ENOMEM;
	141	symbols = (void *) hdr + symtab->sh_offset;
	142	strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset;
	143	for (i = 0; i < me->arch.nsyms; i++) {
	144	if (symbols[i].st_shndx == SHN_UNDEF &&
	145	strcmp(strings + symbols[i].st_name,
	146	"_GLOBAL_OFFSET_TABLE_") == 0)
	147	/* "Define" it as absolute. */
	148	symbols[i].st_shndx = SHN_ABS;
	149	me->arch.syminfo[i].got_offset = -1UL;
	150	me->arch.syminfo[i].plt_offset = -1UL;
	151	me->arch.syminfo[i].got_initialized = 0;
	152	me->arch.syminfo[i].plt_initialized = 0;
	153	}
	154
	155	/* Search for got/plt relocations. */
	156	me->arch.got_size = me->arch.plt_size = 0;
	157	for (i = 0; i < hdr->e_shnum; i++) {
	158	if (sechdrs[i].sh_type != SHT_RELA)
	159	continue;
	160	nrela = sechdrs[i].sh_size / sizeof(Elf_Rela);
	161	rela = (void *) hdr + sechdrs[i].sh_offset;
	162	for (j = 0; j < nrela; j++)
	163	check_rela(rela + j, me);
	164	}
	165
	166	/* Increase core size by size of got & plt and set start
	167	offsets for got and plt. */
	168	me->core_size = ALIGN(me->core_size, 4);
	169	me->arch.got_offset = me->core_size;
	170	me->core_size += me->arch.got_size;
	171	me->arch.plt_offset = me->core_size;
	172	me->core_size += me->arch.plt_size;
	173	return 0;
	174	}
	175
	176	int
	177	apply_relocate(Elf_Shdr sechdrs, const char strtab, unsigned int symindex,
	178	unsigned int relsec, struct module *me)
	179	{
	180	printk(KERN_ERR "module %s: RELOCATION unsupported\n",
	181	me->name);
	182	return -ENOEXEC;
	183	}
	184
	185	static inline int
	186	apply_rela(Elf_Rela rela, Elf_Addr base, Elf_Sym symtab,
	187	struct module *me)
188	{
189	struct mod_arch_syminfo *info;
190	Elf_Addr loc, val;
191	int r_type, r_sym;
192
193	/* This is where to make the change */
194	loc = base + rela->r_offset;
195	/* This is the symbol it is referring to. Note that all
196	undefined symbols have been resolved. */
197	r_sym = ELF_R_SYM(rela->r_info);
198	r_type = ELF_R_TYPE(rela->r_info);
199	info = me->arch.syminfo + r_sym;
200	val = symtab[r_sym].st_value;
201
202	switch (r_type) {
203	case R_390_8: /* Direct 8 bit. */
204	case R_390_12: /* Direct 12 bit. */
205	case R_390_16: /* Direct 16 bit. */
206	case R_390_20: /* Direct 20 bit. */
207	case R_390_32: /* Direct 32 bit. */
208	case R_390_64: /* Direct 64 bit. */
209	val += rela->r_addend;
210	if (r_type == R_390_8)
211	(unsigned char ) loc = val;
212	else if (r_type == R_390_12)
213	(unsigned short ) loc = (val & 0xfff) \|
214	((unsigned short ) loc & 0xf000);
215	else if (r_type == R_390_16)
216	(unsigned short ) loc = val;
217	else if (r_type == R_390_20)
218	(unsigned int ) loc =
219	((unsigned int ) loc & 0xf00000ff) \|
220	(val & 0xfff) << 16 \| (val & 0xff000) >> 4;
221	else if (r_type == R_390_32)
222	(unsigned int ) loc = val;
223	else if (r_type == R_390_64)
224	(unsigned long ) loc = val;
225	break;
226	case R_390_PC16: /* PC relative 16 bit. */
227	case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */
228	case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */
229	case R_390_PC32: /* PC relative 32 bit. */
230	case R_390_PC64: /* PC relative 64 bit. */
231	val += rela->r_addend - loc;
232	if (r_type == R_390_PC16)
233	(unsigned short ) loc = val;
234	else if (r_type == R_390_PC16DBL)
235	(unsigned short ) loc = val >> 1;
236	else if (r_type == R_390_PC32DBL)
237	(unsigned int ) loc = val >> 1;
238	else if (r_type == R_390_PC32)
239	(unsigned int ) loc = val;
240	else if (r_type == R_390_PC64)
241	(unsigned long ) loc = val;
242	break;
243	case R_390_GOT12: /* 12 bit GOT offset. */
244	case R_390_GOT16: /* 16 bit GOT offset. */
245	case R_390_GOT20: /* 20 bit GOT offset. */
246	case R_390_GOT32: /* 32 bit GOT offset. */
247	case R_390_GOT64: /* 64 bit GOT offset. */
248	case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
249	case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
250	case R_390_GOTPLT20: /* 20 bit offset to jump slot. */
251	case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
252	case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
253	case R_390_GOTPLT64: /* 64 bit offset to jump slot. */
254	case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
255	if (info->got_initialized == 0) {
256	Elf_Addr *gotent;
257
258	gotent = me->module_core + me->arch.got_offset +
259	info->got_offset;
260	*gotent = val;
261	info->got_initialized = 1;
262	}
263	val = info->got_offset + rela->r_addend;
264	if (r_type == R_390_GOT12 \|\|
265	r_type == R_390_GOTPLT12)
266	(unsigned short ) loc = (val & 0xfff) \|
267	((unsigned short ) loc & 0xf000);
268	else if (r_type == R_390_GOT16 \|\|
269	r_type == R_390_GOTPLT16)
270	(unsigned short ) loc = val;
271	else if (r_type == R_390_GOT20 \|\|
272	r_type == R_390_GOTPLT20)
273	(unsigned int ) loc =
274	((unsigned int ) loc & 0xf00000ff) \|
275	(val & 0xfff) << 16 \| (val & 0xff000) >> 4;
276	else if (r_type == R_390_GOT32 \|\|
277	r_type == R_390_GOTPLT32)
278	(unsigned int ) loc = val;
279	else if (r_type == R_390_GOTENT \|\|
280	r_type == R_390_GOTPLTENT)
281	(unsigned int ) loc =
282	(val + (Elf_Addr) me->module_core - loc) >> 1;
283	else if (r_type == R_390_GOT64 \|\|
284	r_type == R_390_GOTPLT64)
285	(unsigned long ) loc = val;
286	break;
287	case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
288	case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
289	case R_390_PLT32: /* 32 bit PC relative PLT address. */
290	case R_390_PLT64: /* 64 bit PC relative PLT address. */
291	case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
292	case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
293	case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */
294	if (info->plt_initialized == 0) {
295	unsigned int *ip;
296	ip = me->module_core + me->arch.plt_offset +
297	info->plt_offset;
347a8dc3	298	#ifndef CONFIG_64BIT
1da177e4 LT	299	ip[0] = 0x0d105810; /* basr 1,0; l 1,6(1); br 1 */
	300	ip[1] = 0x100607f1;
	301	ip[2] = val;
347a8dc3	302	#else /* CONFIG_64BIT */
1da177e4 LT	303	ip[0] = 0x0d10e310; /* basr 1,0; lg 1,10(1); br 1 */
	304	ip[1] = 0x100a0004;
	305	ip[2] = 0x07f10000;
	306	ip[3] = (unsigned int) (val >> 32);
	307	ip[4] = (unsigned int) val;
347a8dc3	308	#endif /* CONFIG_64BIT */
1da177e4 LT	309	info->plt_initialized = 1;
	310	}
	311	if (r_type == R_390_PLTOFF16 \|\|
	312	r_type == R_390_PLTOFF32
	313	\|\| r_type == R_390_PLTOFF64
	314	)
	315	val = me->arch.plt_offset - me->arch.got_offset +
	316	info->plt_offset + rela->r_addend;
	317	else
	318	val = (Elf_Addr) me->module_core +
	319	me->arch.plt_offset + info->plt_offset +
	320	rela->r_addend - loc;
	321	if (r_type == R_390_PLT16DBL)
	322	(unsigned short ) loc = val >> 1;
	323	else if (r_type == R_390_PLTOFF16)
	324	(unsigned short ) loc = val;
	325	else if (r_type == R_390_PLT32DBL)
	326	(unsigned int ) loc = val >> 1;
	327	else if (r_type == R_390_PLT32 \|\|
	328	r_type == R_390_PLTOFF32)
	329	(unsigned int ) loc = val;
	330	else if (r_type == R_390_PLT64 \|\|
	331	r_type == R_390_PLTOFF64)
	332	(unsigned long ) loc = val;
	333	break;
	334	case R_390_GOTOFF16: /* 16 bit offset to GOT. */
	335	case R_390_GOTOFF32: /* 32 bit offset to GOT. */
	336	case R_390_GOTOFF64: /* 64 bit offset to GOT. */
	337	val = val + rela->r_addend -
	338	((Elf_Addr) me->module_core + me->arch.got_offset);
	339	if (r_type == R_390_GOTOFF16)
	340	(unsigned short ) loc = val;
	341	else if (r_type == R_390_GOTOFF32)
	342	(unsigned int ) loc = val;
	343	else if (r_type == R_390_GOTOFF64)
	344	(unsigned long ) loc = val;
	345	break;
	346	case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */
	347	case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */
	348	val = (Elf_Addr) me->module_core + me->arch.got_offset +
	349	rela->r_addend - loc;
	350	if (r_type == R_390_GOTPC)
	351	(unsigned int ) loc = val;
	352	else if (r_type == R_390_GOTPCDBL)
	353	(unsigned int ) loc = val >> 1;
	354	break;
	355	case R_390_COPY:
	356	case R_390_GLOB_DAT: /* Create GOT entry. */
	357	case R_390_JMP_SLOT: /* Create PLT entry. */
	358	case R_390_RELATIVE: /* Adjust by program base. */
	359	/* Only needed if we want to support loading of
	360	modules linked with -shared. */
	361	break;
	362	default:
	363	printk(KERN_ERR "module %s: Unknown relocation: %u\n",
	364	me->name, r_type);
	365	return -ENOEXEC;
	366	}
	367	return 0;
	368	}
	369
	370	int
	371	apply_relocate_add(Elf_Shdr sechdrs, const char strtab,
	372	unsigned int symindex, unsigned int relsec,
373	struct module *me)
374	{
375	Elf_Addr base;
376	Elf_Sym *symtab;
377	Elf_Rela *rela;
378	unsigned long i, n;
379	int rc;
380
381	DEBUGP("Applying relocate section %u to %u\n",
382	relsec, sechdrs[relsec].sh_info);
383	base = sechdrs[sechdrs[relsec].sh_info].sh_addr;
384	symtab = (Elf_Sym *) sechdrs[symindex].sh_addr;
385	rela = (Elf_Rela *) sechdrs[relsec].sh_addr;
386	n = sechdrs[relsec].sh_size / sizeof(Elf_Rela);
387
388	for (i = 0; i < n; i++, rela++) {
389	rc = apply_rela(rela, base, symtab, me);
390	if (rc)
391	return rc;
392	}
393	return 0;
394	}
395
396	int module_finalize(const Elf_Ehdr *hdr,
397	const Elf_Shdr *sechdrs,
398	struct module *me)
399	{
400	vfree(me->arch.syminfo);
401	return 0;
402	}
403
404	void module_arch_cleanup(struct module *mod)
405	{
406	}