[net-next-2.6.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>
#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)
{
	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;
}

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 {
			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)
			*(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);
	me->arch.syminfo = NULL;
	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>
c0007f1a	34	#include <linux/bug.h>
1da177e4 LT	35
	36	#if 0
	37	#define DEBUGP printk
	38	#else
	39	#define DEBUGP(fmt , ...)
	40	#endif
	41
347a8dc3	42	#ifndef CONFIG_64BIT
1da177e4	43	#define PLT_ENTRY_SIZE 12
347a8dc3	44	#else /* CONFIG_64BIT */
1da177e4	45	#define PLT_ENTRY_SIZE 20
347a8dc3	46	#endif /* CONFIG_64BIT */
1da177e4 LT	47
	48	void *module_alloc(unsigned long size)
	49	{
	50	if (size == 0)
	51	return NULL;
	52	return vmalloc(size);
	53	}
	54
	55	/* Free memory returned from module_alloc */
	56	void module_free(struct module mod, void module_region)
	57	{
3164a3cb HB	58	if (mod) {
	59	vfree(mod->arch.syminfo);
	60	mod->arch.syminfo = NULL;
	61	}
1da177e4	62	vfree(module_region);
1da177e4 LT	63	}
1da177e4 LT	64
4d284cac	65	static void
1da177e4 LT	66	check_rela(Elf_Rela rela, struct module me)
	67	{
	68	struct mod_arch_syminfo *info;
	69
	70	info = me->arch.syminfo + ELF_R_SYM (rela->r_info);
	71	switch (ELF_R_TYPE (rela->r_info)) {
	72	case R_390_GOT12: /* 12 bit GOT offset. */
	73	case R_390_GOT16: /* 16 bit GOT offset. */
	74	case R_390_GOT20: /* 20 bit GOT offset. */
	75	case R_390_GOT32: /* 32 bit GOT offset. */
	76	case R_390_GOT64: /* 64 bit GOT offset. */
	77	case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
	78	case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
	79	case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
	80	case R_390_GOTPLT20: /* 20 bit offset to jump slot. */
	81	case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
	82	case R_390_GOTPLT64: /* 64 bit offset to jump slot. */
	83	case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
	84	if (info->got_offset == -1UL) {
	85	info->got_offset = me->arch.got_size;
	86	me->arch.got_size += sizeof(void*);
	87	}
	88	break;
	89	case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
	90	case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
	91	case R_390_PLT32: /* 32 bit PC relative PLT address. */
	92	case R_390_PLT64: /* 64 bit PC relative PLT address. */
	93	case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
	94	case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
	95	case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */
	96	if (info->plt_offset == -1UL) {
	97	info->plt_offset = me->arch.plt_size;
	98	me->arch.plt_size += PLT_ENTRY_SIZE;
	99	}
	100	break;
	101	case R_390_COPY:
	102	case R_390_GLOB_DAT:
	103	case R_390_JMP_SLOT:
	104	case R_390_RELATIVE:
	105	/* Only needed if we want to support loading of
	106	modules linked with -shared. */
	107	break;
	108	}
	109	}
	110
	111	/*
	112	* Account for GOT and PLT relocations. We can't add sections for
	113	* got and plt but we can increase the core module size.
	114	*/
	115	int
	116	module_frob_arch_sections(Elf_Ehdr hdr, Elf_Shdr sechdrs,
	117	char secstrings, struct module me)
	118	{
	119	Elf_Shdr *symtab;
	120	Elf_Sym *symbols;
	121	Elf_Rela *rela;
	122	char *strings;
	123	int nrela, i, j;
	124
	125	/* Find symbol table and string table. */
d2c993d8	126	symtab = NULL;
1da177e4 LT	127	for (i = 0; i < hdr->e_shnum; i++)
	128	switch (sechdrs[i].sh_type) {
	129	case SHT_SYMTAB:
	130	symtab = sechdrs + i;
	131	break;
	132	}
	133	if (!symtab) {
	134	printk(KERN_ERR "module %s: no symbol table\n", me->name);
	135	return -ENOEXEC;
	136	}
	137
	138	/* Allocate one syminfo structure per symbol. */
	139	me->arch.nsyms = symtab->sh_size / sizeof(Elf_Sym);
	140	me->arch.syminfo = vmalloc(me->arch.nsyms *
	141	sizeof(struct mod_arch_syminfo));
	142	if (!me->arch.syminfo)
	143	return -ENOMEM;
	144	symbols = (void *) hdr + symtab->sh_offset;
	145	strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset;
	146	for (i = 0; i < me->arch.nsyms; i++) {
	147	if (symbols[i].st_shndx == SHN_UNDEF &&
	148	strcmp(strings + symbols[i].st_name,
	149	"_GLOBAL_OFFSET_TABLE_") == 0)
	150	/* "Define" it as absolute. */
	151	symbols[i].st_shndx = SHN_ABS;
	152	me->arch.syminfo[i].got_offset = -1UL;
	153	me->arch.syminfo[i].plt_offset = -1UL;
	154	me->arch.syminfo[i].got_initialized = 0;
	155	me->arch.syminfo[i].plt_initialized = 0;
	156	}
	157
	158	/* Search for got/plt relocations. */
	159	me->arch.got_size = me->arch.plt_size = 0;
	160	for (i = 0; i < hdr->e_shnum; i++) {
	161	if (sechdrs[i].sh_type != SHT_RELA)
	162	continue;
	163	nrela = sechdrs[i].sh_size / sizeof(Elf_Rela);
	164	rela = (void *) hdr + sechdrs[i].sh_offset;
	165	for (j = 0; j < nrela; j++)
	166	check_rela(rela + j, me);
	167	}
	168
	169	/* Increase core size by size of got & plt and set start
	170	offsets for got and plt. */
	171	me->core_size = ALIGN(me->core_size, 4);
	172	me->arch.got_offset = me->core_size;
	173	me->core_size += me->arch.got_size;
	174	me->arch.plt_offset = me->core_size;
	175	me->core_size += me->arch.plt_size;
	176	return 0;
	177	}
	178
	179	int
	180	apply_relocate(Elf_Shdr sechdrs, const char strtab, unsigned int symindex,
	181	unsigned int relsec, struct module *me)
	182	{
	183	printk(KERN_ERR "module %s: RELOCATION unsupported\n",
	184	me->name);
	185	return -ENOEXEC;
	186	}
	187
4d284cac	188	static int
1da177e4 LT	189	apply_rela(Elf_Rela rela, Elf_Addr base, Elf_Sym symtab,
	190	struct module *me)
	191	{
	192	struct mod_arch_syminfo *info;
	193	Elf_Addr loc, val;
	194	int r_type, r_sym;
	195
	196	/* This is where to make the change */
	197	loc = base + rela->r_offset;
	198	/* This is the symbol it is referring to. Note that all
	199	undefined symbols have been resolved. */
	200	r_sym = ELF_R_SYM(rela->r_info);
	201	r_type = ELF_R_TYPE(rela->r_info);
	202	info = me->arch.syminfo + r_sym;
	203	val = symtab[r_sym].st_value;
	204
	205	switch (r_type) {
	206	case R_390_8: /* Direct 8 bit. */
	207	case R_390_12: /* Direct 12 bit. */
	208	case R_390_16: /* Direct 16 bit. */
	209	case R_390_20: /* Direct 20 bit. */
	210	case R_390_32: /* Direct 32 bit. */
	211	case R_390_64: /* Direct 64 bit. */
	212	val += rela->r_addend;
	213	if (r_type == R_390_8)
	214	(unsigned char ) loc = val;
	215	else if (r_type == R_390_12)
	216	(unsigned short ) loc = (val & 0xfff) \|
	217	((unsigned short ) loc & 0xf000);
	218	else if (r_type == R_390_16)
	219	(unsigned short ) loc = val;
	220	else if (r_type == R_390_20)
	221	(unsigned int ) loc =
	222	((unsigned int ) loc & 0xf00000ff) \|
	223	(val & 0xfff) << 16 \| (val & 0xff000) >> 4;
	224	else if (r_type == R_390_32)
	225	(unsigned int ) loc = val;
	226	else if (r_type == R_390_64)
	227	(unsigned long ) loc = val;
	228	break;
	229	case R_390_PC16: /* PC relative 16 bit. */
	230	case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */
	231	case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */
	232	case R_390_PC32: /* PC relative 32 bit. */
	233	case R_390_PC64: /* PC relative 64 bit. */
	234	val += rela->r_addend - loc;
	235	if (r_type == R_390_PC16)
	236	(unsigned short ) loc = val;
	237	else if (r_type == R_390_PC16DBL)
	238	(unsigned short ) loc = val >> 1;
	239	else if (r_type == R_390_PC32DBL)
	240	(unsigned int ) loc = val >> 1;
	241	else if (r_type == R_390_PC32)
	242	(unsigned int ) loc = val;
	243	else if (r_type == R_390_PC64)
	244	(unsigned long ) loc = val;
	245	break;
	246	case R_390_GOT12: /* 12 bit GOT offset. */
	247	case R_390_GOT16: /* 16 bit GOT offset. */
	248	case R_390_GOT20: /* 20 bit GOT offset. */
	249	case R_390_GOT32: /* 32 bit GOT offset. */
	250	case R_390_GOT64: /* 64 bit GOT offset. */
	251	case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
	252	case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
253	case R_390_GOTPLT20: /* 20 bit offset to jump slot. */
254	case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
255	case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
256	case R_390_GOTPLT64: /* 64 bit offset to jump slot. */
257	case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
258	if (info->got_initialized == 0) {
259	Elf_Addr *gotent;
260
261	gotent = me->module_core + me->arch.got_offset +
262	info->got_offset;
263	*gotent = val;
264	info->got_initialized = 1;
265	}
266	val = info->got_offset + rela->r_addend;
267	if (r_type == R_390_GOT12 \|\|
268	r_type == R_390_GOTPLT12)
269	(unsigned short ) loc = (val & 0xfff) \|
270	((unsigned short ) loc & 0xf000);
271	else if (r_type == R_390_GOT16 \|\|
272	r_type == R_390_GOTPLT16)
273	(unsigned short ) loc = val;
274	else if (r_type == R_390_GOT20 \|\|
275	r_type == R_390_GOTPLT20)
276	(unsigned int ) loc =
277	((unsigned int ) loc & 0xf00000ff) \|
278	(val & 0xfff) << 16 \| (val & 0xff000) >> 4;
279	else if (r_type == R_390_GOT32 \|\|
280	r_type == R_390_GOTPLT32)
281	(unsigned int ) loc = val;
282	else if (r_type == R_390_GOTENT \|\|
283	r_type == R_390_GOTPLTENT)
284	(unsigned int ) loc =
285	(val + (Elf_Addr) me->module_core - loc) >> 1;
286	else if (r_type == R_390_GOT64 \|\|
287	r_type == R_390_GOTPLT64)
288	(unsigned long ) loc = val;
289	break;
290	case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
291	case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
292	case R_390_PLT32: /* 32 bit PC relative PLT address. */
293	case R_390_PLT64: /* 64 bit PC relative PLT address. */
294	case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
295	case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
296	case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */
297	if (info->plt_initialized == 0) {
298	unsigned int *ip;
299	ip = me->module_core + me->arch.plt_offset +
300	info->plt_offset;
347a8dc3	301	#ifndef CONFIG_64BIT
1da177e4 LT	302	ip[0] = 0x0d105810; /* basr 1,0; l 1,6(1); br 1 */
	303	ip[1] = 0x100607f1;
	304	ip[2] = val;
347a8dc3	305	#else /* CONFIG_64BIT */
1da177e4 LT	306	ip[0] = 0x0d10e310; /* basr 1,0; lg 1,10(1); br 1 */
	307	ip[1] = 0x100a0004;
	308	ip[2] = 0x07f10000;
	309	ip[3] = (unsigned int) (val >> 32);
	310	ip[4] = (unsigned int) val;
347a8dc3	311	#endif /* CONFIG_64BIT */
1da177e4 LT	312	info->plt_initialized = 1;
	313	}
	314	if (r_type == R_390_PLTOFF16 \|\|
504665a9 MS	315	r_type == R_390_PLTOFF32 \|\|
504665a9 MS	316	r_type == R_390_PLTOFF64)
1da177e4 LT	317	val = me->arch.plt_offset - me->arch.got_offset +
1da177e4 LT	318	info->plt_offset + rela->r_addend;
504665a9 MS	319	else {
	320	if (!((r_type == R_390_PLT16DBL &&
	321	val - loc + 0xffffUL < 0x1ffffeUL) \|\|
	322	(r_type == R_390_PLT32DBL &&
	323	val - loc + 0xffffffffULL < 0x1fffffffeULL)))
	324	val = (Elf_Addr) me->module_core +
	325	me->arch.plt_offset +
	326	info->plt_offset;
	327	val += rela->r_addend - loc;
	328	}
1da177e4 LT	329	if (r_type == R_390_PLT16DBL)
	330	(unsigned short ) loc = val >> 1;
	331	else if (r_type == R_390_PLTOFF16)
	332	(unsigned short ) loc = val;
	333	else if (r_type == R_390_PLT32DBL)
	334	(unsigned int ) loc = val >> 1;
	335	else if (r_type == R_390_PLT32 \|\|
	336	r_type == R_390_PLTOFF32)
	337	(unsigned int ) loc = val;
	338	else if (r_type == R_390_PLT64 \|\|
	339	r_type == R_390_PLTOFF64)
	340	(unsigned long ) loc = val;
	341	break;
	342	case R_390_GOTOFF16: /* 16 bit offset to GOT. */
	343	case R_390_GOTOFF32: /* 32 bit offset to GOT. */
	344	case R_390_GOTOFF64: /* 64 bit offset to GOT. */
	345	val = val + rela->r_addend -
	346	((Elf_Addr) me->module_core + me->arch.got_offset);
	347	if (r_type == R_390_GOTOFF16)
	348	(unsigned short ) loc = val;
	349	else if (r_type == R_390_GOTOFF32)
	350	(unsigned int ) loc = val;
	351	else if (r_type == R_390_GOTOFF64)
	352	(unsigned long ) loc = val;
	353	break;
	354	case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */
	355	case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */
	356	val = (Elf_Addr) me->module_core + me->arch.got_offset +
	357	rela->r_addend - loc;
	358	if (r_type == R_390_GOTPC)
	359	(unsigned int ) loc = val;
	360	else if (r_type == R_390_GOTPCDBL)
	361	(unsigned int ) loc = val >> 1;
	362	break;
	363	case R_390_COPY:
	364	case R_390_GLOB_DAT: /* Create GOT entry. */
	365	case R_390_JMP_SLOT: /* Create PLT entry. */
	366	case R_390_RELATIVE: /* Adjust by program base. */
	367	/* Only needed if we want to support loading of
	368	modules linked with -shared. */
	369	break;
	370	default:
	371	printk(KERN_ERR "module %s: Unknown relocation: %u\n",
	372	me->name, r_type);
	373	return -ENOEXEC;
	374	}
	375	return 0;
	376	}
	377
	378	int
	379	apply_relocate_add(Elf_Shdr sechdrs, const char strtab,
	380	unsigned int symindex, unsigned int relsec,
	381	struct module *me)
	382	{
	383	Elf_Addr base;
	384	Elf_Sym *symtab;
	385	Elf_Rela *rela;
	386	unsigned long i, n;
	387	int rc;
	388
	389	DEBUGP("Applying relocate section %u to %u\n",
	390	relsec, sechdrs[relsec].sh_info);
	391	base = sechdrs[sechdrs[relsec].sh_info].sh_addr;
	392	symtab = (Elf_Sym *) sechdrs[symindex].sh_addr;
393	rela = (Elf_Rela *) sechdrs[relsec].sh_addr;
394	n = sechdrs[relsec].sh_size / sizeof(Elf_Rela);
395
396	for (i = 0; i < n; i++, rela++) {
397	rc = apply_rela(rela, base, symtab, me);
398	if (rc)
399	return rc;
400	}
401	return 0;
402	}
403
404	int module_finalize(const Elf_Ehdr *hdr,
405	const Elf_Shdr *sechdrs,
406	struct module *me)
407	{
408	vfree(me->arch.syminfo);
6a03f5f0	409	me->arch.syminfo = NULL;
5336377d	410	return 0;
1da177e4 LT	411	}
	412
	413	void module_arch_cleanup(struct module *mod)
	414	{
	415	}