[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sh / kernel / module.c

/*  Kernel module help for SH.

    SHcompact version by Kaz Kojima and Paul Mundt.

    SHmedia bits:

	Copyright 2004 SuperH (UK) Ltd
	Author: Richard Curnow

	Based on the sh version, and on code from the sh64-specific parts of
	modutils, originally written by Richard Curnow and Ben Gaster.

    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/moduleloader.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <asm/unaligned.h>

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. */
}

/* We don't need anything special. */
int module_frob_arch_sections(Elf_Ehdr *hdr,
			      Elf_Shdr *sechdrs,
			      char *secstrings,
			      struct module *mod)
{
	return 0;
}

int apply_relocate_add(Elf32_Shdr *sechdrs,
		   const char *strtab,
		   unsigned int symindex,
		   unsigned int relsec,
		   struct module *me)
{
	unsigned int i;
	Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
	Elf32_Sym *sym;
	Elf32_Addr relocation;
	uint32_t *location;
	uint32_t value;

	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.  Note that all
		   undefined symbols have been resolved.  */
		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
			+ ELF32_R_SYM(rel[i].r_info);
		relocation = sym->st_value + rel[i].r_addend;

#ifdef CONFIG_SUPERH64
		/* For text addresses, bit2 of the st_other field indicates
		 * whether the symbol is SHmedia (1) or SHcompact (0).  If
		 * SHmedia, the LSB of the symbol needs to be asserted
		 * for the CPU to be in SHmedia mode when it starts executing
		 * the branch target. */
		relocation |= (sym->st_other & 4);
#endif

		switch (ELF32_R_TYPE(rel[i].r_info)) {
		case R_SH_DIR32:
			value = get_unaligned(location);
			value += relocation;
			put_unaligned(value, location);
			break;
		case R_SH_REL32:
			relocation = (relocation - (Elf32_Addr) location);
			value = get_unaligned(location);
			value += relocation;
			put_unaligned(value, location);
			break;
		case R_SH_IMM_LOW16:
			*location = (*location & ~0x3fffc00) |
				((relocation & 0xffff) << 10);
			break;
		case R_SH_IMM_MEDLOW16:
			*location = (*location & ~0x3fffc00) |
				(((relocation >> 16) & 0xffff) << 10);
			break;
		case R_SH_IMM_LOW16_PCREL:
			relocation -= (Elf32_Addr) location;
			*location = (*location & ~0x3fffc00) |
				((relocation & 0xffff) << 10);
			break;
		case R_SH_IMM_MEDLOW16_PCREL:
			relocation -= (Elf32_Addr) location;
			*location = (*location & ~0x3fffc00) |
				(((relocation >> 16) & 0xffff) << 10);
			break;
		default:
			printk(KERN_ERR "module %s: Unknown relocation: %u\n",
			       me->name, ELF32_R_TYPE(rel[i].r_info));
			return -ENOEXEC;
		}
	}
	return 0;
}

int apply_relocate(Elf32_Shdr *sechdrs,
		       const char *strtab,
		       unsigned int symindex,
		       unsigned int relsec,
		       struct module *me)
{
	printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
	       me->name);
	return -ENOEXEC;
}

int module_finalize(const Elf_Ehdr *hdr,
		    const Elf_Shdr *sechdrs,
		    struct module *me)
{
	return 0;
}

void module_arch_cleanup(struct module *mod)
{
}
Commit	Line	Data
1da177e4 LT	1	/* Kernel module help for SH.
1da177e4 LT	2
1cb80fcf PM	3	SHcompact version by Kaz Kojima and Paul Mundt.
	4
	5	SHmedia bits:
	6
	7	Copyright 2004 SuperH (UK) Ltd
	8	Author: Richard Curnow
	9
	10	Based on the sh version, and on code from the sh64-specific parts of
	11	modutils, originally written by Richard Curnow and Ben Gaster.
	12
1da177e4 LT	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/moduleloader.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>
1f9d2949	33	#include <asm/unaligned.h>
1da177e4	34
1da177e4 LT	35	void *module_alloc(unsigned long size)
	36	{
	37	if (size == 0)
	38	return NULL;
	39	return vmalloc(size);
	40	}
	41
	42
	43	/* Free memory returned from module_alloc */
	44	void module_free(struct module mod, void module_region)
	45	{
	46	vfree(module_region);
	47	/* FIXME: If module_region == mod->init_region, trim exception
	48	table entries. */
	49	}
	50
	51	/* We don't need anything special. */
	52	int module_frob_arch_sections(Elf_Ehdr *hdr,
	53	Elf_Shdr *sechdrs,
	54	char *secstrings,
	55	struct module *mod)
	56	{
	57	return 0;
	58	}
	59
1da177e4 LT	60	int apply_relocate_add(Elf32_Shdr *sechdrs,
	61	const char *strtab,
	62	unsigned int symindex,
	63	unsigned int relsec,
	64	struct module *me)
	65	{
	66	unsigned int i;
	67	Elf32_Rela rel = (void )sechdrs[relsec].sh_addr;
	68	Elf32_Sym *sym;
	69	Elf32_Addr relocation;
	70	uint32_t *location;
	71	uint32_t value;
1da177e4	72
1cb80fcf PM	73	pr_debug("Applying relocate section %u to %u\n", relsec,
1cb80fcf PM	74	sechdrs[relsec].sh_info);
1da177e4 LT	75	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
	76	/* This is where to make the change */
	77	location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
	78	+ rel[i].r_offset;
	79	/* This is the symbol it is referring to. Note that all
	80	undefined symbols have been resolved. */
	81	sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
	82	+ ELF32_R_SYM(rel[i].r_info);
	83	relocation = sym->st_value + rel[i].r_addend;
1da177e4	84
1cb80fcf PM	85	#ifdef CONFIG_SUPERH64
	86	/* For text addresses, bit2 of the st_other field indicates
	87	* whether the symbol is SHmedia (1) or SHcompact (0). If
	88	* SHmedia, the LSB of the symbol needs to be asserted
	89	* for the CPU to be in SHmedia mode when it starts executing
	90	* the branch target. */
	91	relocation \|= (sym->st_other & 4);
	92	#endif
	93
1da177e4 LT	94	switch (ELF32_R_TYPE(rel[i].r_info)) {
1da177e4 LT	95	case R_SH_DIR32:
1f9d2949	96	value = get_unaligned(location);
1da177e4	97	value += relocation;
1f9d2949	98	put_unaligned(value, location);
1da177e4 LT	99	break;
1da177e4 LT	100	case R_SH_REL32:
1cb80fcf	101	relocation = (relocation - (Elf32_Addr) location);
1f9d2949	102	value = get_unaligned(location);
1da177e4	103	value += relocation;
1f9d2949	104	put_unaligned(value, location);
1cb80fcf PM	105	break;
	106	case R_SH_IMM_LOW16:
	107	location = (location & ~0x3fffc00) \|
	108	((relocation & 0xffff) << 10);
	109	break;
	110	case R_SH_IMM_MEDLOW16:
	111	location = (location & ~0x3fffc00) \|
	112	(((relocation >> 16) & 0xffff) << 10);
	113	break;
	114	case R_SH_IMM_LOW16_PCREL:
	115	relocation -= (Elf32_Addr) location;
	116	location = (location & ~0x3fffc00) \|
	117	((relocation & 0xffff) << 10);
	118	break;
	119	case R_SH_IMM_MEDLOW16_PCREL:
	120	relocation -= (Elf32_Addr) location;
	121	location = (location & ~0x3fffc00) \|
	122	(((relocation >> 16) & 0xffff) << 10);
1da177e4 LT	123	break;
	124	default:
	125	printk(KERN_ERR "module %s: Unknown relocation: %u\n",
	126	me->name, ELF32_R_TYPE(rel[i].r_info));
	127	return -ENOEXEC;
	128	}
	129	}
	130	return 0;
	131	}
	132
	133	int apply_relocate(Elf32_Shdr *sechdrs,
	134	const char *strtab,
	135	unsigned int symindex,
	136	unsigned int relsec,
	137	struct module *me)
	138	{
	139	printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
	140	me->name);
	141	return -ENOEXEC;
	142	}
	143
	144	int module_finalize(const Elf_Ehdr *hdr,
	145	const Elf_Shdr *sechdrs,
	146	struct module *me)
	147	{
	148	return 0;
	149	}
	150
	151	void module_arch_cleanup(struct module *mod)
	152	{
	153	}