[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / arch / mips / kernel / module-rela.c

/*
 *  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
 *
 *  Copyright (C) 2001 Rusty Russell.
 *  Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
 *  Copyright (C) 2005 Thiemo Seufer
 */

#include <linux/elf.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/moduleloader.h>

extern int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v);

static int apply_r_mips_32_rela(struct module *me, u32 *location, Elf_Addr v)
{
	*location = v;

	return 0;
}

static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
{
	if (v % 4) {
		pr_err("module %s: dangerous R_MIPS_26 RELArelocation\n",
		       me->name);
		return -ENOEXEC;
	}

	if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
		printk(KERN_ERR
		       "module %s: relocation overflow\n",
		       me->name);
		return -ENOEXEC;
	}

	*location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);

	return 0;
}

static int apply_r_mips_hi16_rela(struct module *me, u32 *location, Elf_Addr v)
{
	*location = (*location & 0xffff0000) |
		    ((((long long) v + 0x8000LL) >> 16) & 0xffff);

	return 0;
}

static int apply_r_mips_lo16_rela(struct module *me, u32 *location, Elf_Addr v)
{
	*location = (*location & 0xffff0000) | (v & 0xffff);

	return 0;
}

static int apply_r_mips_64_rela(struct module *me, u32 *location, Elf_Addr v)
{
	*(Elf_Addr *)location = v;

	return 0;
}

static int apply_r_mips_higher_rela(struct module *me, u32 *location,
				    Elf_Addr v)
{
	*location = (*location & 0xffff0000) |
		    ((((long long) v + 0x80008000LL) >> 32) & 0xffff);

	return 0;
}

static int apply_r_mips_highest_rela(struct module *me, u32 *location,
				     Elf_Addr v)
{
	*location = (*location & 0xffff0000) |
		    ((((long long) v + 0x800080008000LL) >> 48) & 0xffff);

	return 0;
}

static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
				Elf_Addr v) = {
	[R_MIPS_NONE]		= apply_r_mips_none,
	[R_MIPS_32]		= apply_r_mips_32_rela,
	[R_MIPS_26]		= apply_r_mips_26_rela,
	[R_MIPS_HI16]		= apply_r_mips_hi16_rela,
	[R_MIPS_LO16]		= apply_r_mips_lo16_rela,
	[R_MIPS_64]		= apply_r_mips_64_rela,
	[R_MIPS_HIGHER]		= apply_r_mips_higher_rela,
	[R_MIPS_HIGHEST]	= apply_r_mips_highest_rela
};

int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
		       unsigned int symindex, unsigned int relsec,
		       struct module *me)
{
	Elf_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr;
	Elf_Sym *sym;
	u32 *location;
	unsigned int i;
	Elf_Addr v;
	int res;

	pr_debug("Applying relocate section %u to %u\n", relsec,
	       sechdrs[relsec].sh_info);

	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
		/* This is where to make the change */
		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
			+ rel[i].r_offset;
		/* This is the symbol it is referring to */
		sym = (Elf_Sym *)sechdrs[symindex].sh_addr
			+ ELF_MIPS_R_SYM(rel[i]);
		if (IS_ERR_VALUE(sym->st_value)) {
			/* Ignore unresolved weak symbol */
			if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
				continue;
			printk(KERN_WARNING "%s: Unknown symbol %s\n",
			       me->name, strtab + sym->st_name);
			return -ENOENT;
		}

		v = sym->st_value + rel[i].r_addend;

		res = reloc_handlers_rela[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
		if (res)
			return res;
	}

	return 0;
}
Commit	Line	Data
6ede8123 RB	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License as published by
	4	* the Free Software Foundation; either version 2 of the License, or
	5	* (at your option) any later version.
	6	*
	7	* This program is distributed in the hope that it will be useful,
	8	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	* GNU General Public License for more details.
	11	*
	12	* You should have received a copy of the GNU General Public License
	13	* along with this program; if not, write to the Free Software
	14	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	15	*
	16	* Copyright (C) 2001 Rusty Russell.
	17	* Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
	18	* Copyright (C) 2005 Thiemo Seufer
	19	*/
	20
	21	#include <linux/elf.h>
	22	#include <linux/err.h>
	23	#include <linux/errno.h>
	24	#include <linux/moduleloader.h>
	25
	26	extern int apply_r_mips_none(struct module me, u32 location, Elf_Addr v);
	27
	28	static int apply_r_mips_32_rela(struct module me, u32 location, Elf_Addr v)
	29	{
	30	*location = v;
	31
	32	return 0;
	33	}
	34
	35	static int apply_r_mips_26_rela(struct module me, u32 location, Elf_Addr v)
	36	{
	37	if (v % 4) {
	38	pr_err("module %s: dangerous R_MIPS_26 RELArelocation\n",
	39	me->name);
	40	return -ENOEXEC;
	41	}
	42
	43	if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
	44	printk(KERN_ERR
	45	"module %s: relocation overflow\n",
	46	me->name);
	47	return -ENOEXEC;
	48	}
	49
	50	location = (location & ~0x03ffffff) \| ((v >> 2) & 0x03ffffff);
	51
	52	return 0;
	53	}
	54
	55	static int apply_r_mips_hi16_rela(struct module me, u32 location, Elf_Addr v)
	56	{
	57	location = (location & 0xffff0000) \|
70342287	58	((((long long) v + 0x8000LL) >> 16) & 0xffff);
6ede8123 RB	59
	60	return 0;
	61	}
	62
	63	static int apply_r_mips_lo16_rela(struct module me, u32 location, Elf_Addr v)
	64	{
	65	location = (location & 0xffff0000) \| (v & 0xffff);
	66
	67	return 0;
	68	}
	69
	70	static int apply_r_mips_64_rela(struct module me, u32 location, Elf_Addr v)
	71	{
	72	(Elf_Addr )location = v;
	73
	74	return 0;
	75	}
	76
	77	static int apply_r_mips_higher_rela(struct module me, u32 location,
	78	Elf_Addr v)
	79	{
	80	location = (location & 0xffff0000) \|
70342287	81	((((long long) v + 0x80008000LL) >> 32) & 0xffff);
6ede8123 RB	82
	83	return 0;
	84	}
	85
	86	static int apply_r_mips_highest_rela(struct module me, u32 location,
	87	Elf_Addr v)
	88	{
	89	location = (location & 0xffff0000) \|
70342287	90	((((long long) v + 0x800080008000LL) >> 48) & 0xffff);
6ede8123 RB	91
	92	return 0;
	93	}
	94
	95	static int (reloc_handlers_rela[]) (struct module me, u32 *location,
	96	Elf_Addr v) = {
	97	[R_MIPS_NONE] = apply_r_mips_none,
	98	[R_MIPS_32] = apply_r_mips_32_rela,
	99	[R_MIPS_26] = apply_r_mips_26_rela,
	100	[R_MIPS_HI16] = apply_r_mips_hi16_rela,
	101	[R_MIPS_LO16] = apply_r_mips_lo16_rela,
	102	[R_MIPS_64] = apply_r_mips_64_rela,
	103	[R_MIPS_HIGHER] = apply_r_mips_higher_rela,
	104	[R_MIPS_HIGHEST] = apply_r_mips_highest_rela
	105	};
	106
	107	int apply_relocate_add(Elf_Shdr sechdrs, const char strtab,
	108	unsigned int symindex, unsigned int relsec,
	109	struct module *me)
	110	{
	111	Elf_Mips_Rela rel = (void ) sechdrs[relsec].sh_addr;
	112	Elf_Sym *sym;
	113	u32 *location;
	114	unsigned int i;
	115	Elf_Addr v;
	116	int res;
	117
	118	pr_debug("Applying relocate section %u to %u\n", relsec,
	119	sechdrs[relsec].sh_info);
	120
	121	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
	122	/* This is where to make the change */
	123	location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
	124	+ rel[i].r_offset;
	125	/* This is the symbol it is referring to */
	126	sym = (Elf_Sym *)sechdrs[symindex].sh_addr
	127	+ ELF_MIPS_R_SYM(rel[i]);
	128	if (IS_ERR_VALUE(sym->st_value)) {
	129	/* Ignore unresolved weak symbol */
	130	if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
	131	continue;
	132	printk(KERN_WARNING "%s: Unknown symbol %s\n",
	133	me->name, strtab + sym->st_name);
	134	return -ENOENT;
	135	}
	136
	137	v = sym->st_value + rel[i].r_addend;
	138
	139	res = reloc_handlers_rela[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
	140	if (res)
	141	return res;
	142	}
	143
	144	return 0;
	145	}