[net-next-2.6.git] / arch / microblaze / kernel / module.c

/*
 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2007-2009 PetaLogix
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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

#include <asm/pgtable.h>

void *module_alloc(unsigned long size)
{
	void *ret;
	ret = (size == 0) ? NULL : vmalloc(size);
	pr_debug("module_alloc (%08lx@%08lx)\n", size, (unsigned long int)ret);
	return ret;
}

void module_free(struct module *module, void *region)
{
	pr_debug("module_free(%s,%08lx)\n", module->name,
					(unsigned long)region);
	vfree(region);
}

int module_frob_arch_sections(Elf_Ehdr *hdr,
				Elf_Shdr *sechdrs,
				char *secstrings,
				struct module *mod)
{
	return 0;
}

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

int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
	unsigned int symindex, unsigned int relsec, struct module *module)
{

	unsigned int i;
	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
	Elf32_Sym *sym;
	unsigned long int *location;
	unsigned long int value;
#if __GNUC__ < 4
	unsigned long int old_value;
#endif

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

	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {

		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
				rela[i].r_offset;
		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
			ELF32_R_SYM(rela[i].r_info);
		value = sym->st_value + rela[i].r_addend;

		switch (ELF32_R_TYPE(rela[i].r_info)) {

		/*
		 * Be careful! mb-gcc / mb-ld splits the relocs between the
		 * text and the reloc table. In general this means we must
		 * read the current contents of (*location), add any offset
		 * then store the result back in
		 */

		case R_MICROBLAZE_32:
#if __GNUC__ < 4
			old_value = *location;
			*location = value + old_value;

			pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
				old_value, value);
#else
			*location = value;
#endif
			break;

		case R_MICROBLAZE_64:
#if __GNUC__ < 4
			/* Split relocs only required/used pre gcc4.1.1 */
			old_value = ((location[0] & 0x0000FFFF) << 16) |
					(location[1] & 0x0000FFFF);
			value += old_value;
#endif
			location[0] = (location[0] & 0xFFFF0000) |
					(value >> 16);
			location[1] = (location[1] & 0xFFFF0000) |
					(value & 0xFFFF);
#if __GNUC__ < 4
			pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
				old_value, value);
#endif
			break;

		case R_MICROBLAZE_64_PCREL:
#if __GNUC__ < 4
			old_value = (location[0] & 0xFFFF) << 16 |
				(location[1] & 0xFFFF);
			value -= old_value;
#endif
			value -= (unsigned long int)(location) + 4;
			location[0] = (location[0] & 0xFFFF0000) |
					(value >> 16);
			location[1] = (location[1] & 0xFFFF0000) |
					(value & 0xFFFF);
			pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
				value);
			break;

		case R_MICROBLAZE_32_PCREL_LO:
			pr_debug("R_MICROBLAZE_32_PCREL_LO\n");
			break;

		case R_MICROBLAZE_64_NONE:
			pr_debug("R_MICROBLAZE_NONE\n");
			break;

		case R_MICROBLAZE_NONE:
			pr_debug("R_MICROBLAZE_NONE\n");
			break;

		default:
			printk(KERN_ERR "module %s: "
				"Unknown relocation: %u\n",
				module->name,
				ELF32_R_TYPE(rela[i].r_info));
			return -ENOEXEC;
		}
	}
	return 0;
}

int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
		struct module *module)
{
	return 0;
}

void module_arch_cleanup(struct module *mod)
{
}
Commit	Line	Data
f6b165c6 MS	1	/*
	2	* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
	3	* Copyright (C) 2007-2009 PetaLogix
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/moduleloader.h>
	12	#include <linux/kernel.h>
	13	#include <linux/elf.h>
	14	#include <linux/vmalloc.h>
f6b165c6 MS	15	#include <linux/fs.h>
	16	#include <linux/string.h>
	17
	18	#include <asm/pgtable.h>
	19
	20	void *module_alloc(unsigned long size)
	21	{
	22	void *ret;
	23	ret = (size == 0) ? NULL : vmalloc(size);
	24	pr_debug("module_alloc (%08lx@%08lx)\n", size, (unsigned long int)ret);
	25	return ret;
	26	}
	27
	28	void module_free(struct module module, void region)
	29	{
	30	pr_debug("module_free(%s,%08lx)\n", module->name,
	31	(unsigned long)region);
	32	vfree(region);
	33	}
	34
	35	int module_frob_arch_sections(Elf_Ehdr *hdr,
	36	Elf_Shdr *sechdrs,
	37	char *secstrings,
	38	struct module *mod)
	39	{
	40	return 0;
	41	}
	42
	43	int apply_relocate(Elf32_Shdr sechdrs, const char strtab,
	44	unsigned int symindex, unsigned int relsec, struct module *module)
	45	{
	46	printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
	47	module->name);
	48	return -ENOEXEC;
	49	}
	50
	51	int apply_relocate_add(Elf32_Shdr sechdrs, const char strtab,
	52	unsigned int symindex, unsigned int relsec, struct module *module)
	53	{
	54
	55	unsigned int i;
	56	Elf32_Rela rela = (void )sechdrs[relsec].sh_addr;
	57	Elf32_Sym *sym;
	58	unsigned long int *location;
f6b165c6 MS	59	unsigned long int value;
	60	#if __GNUC__ < 4
	61	unsigned long int old_value;
	62	#endif
	63
	64	pr_debug("Applying add relocation section %u to %u\n",
	65	relsec, sechdrs[relsec].sh_info);
	66
	67	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
	68
	69	location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
	70	rela[i].r_offset;
	71	sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
	72	ELF32_R_SYM(rela[i].r_info);
	73	value = sym->st_value + rela[i].r_addend;
	74
	75	switch (ELF32_R_TYPE(rela[i].r_info)) {
	76
	77	/*
	78	* Be careful! mb-gcc / mb-ld splits the relocs between the
	79	* text and the reloc table. In general this means we must
	80	* read the current contents of (*location), add any offset
	81	* then store the result back in
	82	*/
	83
	84	case R_MICROBLAZE_32:
	85	#if __GNUC__ < 4
	86	old_value = *location;
	87	*location = value + old_value;
	88
	89	pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
	90	old_value, value);
	91	#else
	92	*location = value;
	93	#endif
	94	break;
	95
	96	case R_MICROBLAZE_64:
	97	#if __GNUC__ < 4
	98	/* Split relocs only required/used pre gcc4.1.1 */
	99	old_value = ((location[0] & 0x0000FFFF) << 16) \|
	100	(location[1] & 0x0000FFFF);
	101	value += old_value;
	102	#endif
	103	location[0] = (location[0] & 0xFFFF0000) \|
	104	(value >> 16);
	105	location[1] = (location[1] & 0xFFFF0000) \|
	106	(value & 0xFFFF);
	107	#if __GNUC__ < 4
	108	pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
	109	old_value, value);
	110	#endif
	111	break;
	112
	113	case R_MICROBLAZE_64_PCREL:
fadf2e60 JW	114	#if __GNUC__ < 4
fadf2e60 JW	115	old_value = (location[0] & 0xFFFF) << 16 \|
f6b165c6	116	(location[1] & 0xFFFF);
fadf2e60 JW	117	value -= old_value;
	118	#endif
	119	value -= (unsigned long int)(location) + 4;
f6b165c6 MS	120	location[0] = (location[0] & 0xFFFF0000) \|
	121	(value >> 16);
	122	location[1] = (location[1] & 0xFFFF0000) \|
	123	(value & 0xFFFF);
	124	pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
	125	value);
	126	break;
	127
fadf2e60 JW	128	case R_MICROBLAZE_32_PCREL_LO:
	129	pr_debug("R_MICROBLAZE_32_PCREL_LO\n");
	130	break;
	131
679711b8 MS	132	case R_MICROBLAZE_64_NONE:
	133	pr_debug("R_MICROBLAZE_NONE\n");
	134	break;
	135
f6b165c6 MS	136	case R_MICROBLAZE_NONE:
	137	pr_debug("R_MICROBLAZE_NONE\n");
	138	break;
	139
	140	default:
	141	printk(KERN_ERR "module %s: "
	142	"Unknown relocation: %u\n",
	143	module->name,
fadf2e60	144	ELF32_R_TYPE(rela[i].r_info));
f6b165c6 MS	145	return -ENOEXEC;
	146	}
	147	}
	148	return 0;
	149	}
	150
	151	int module_finalize(const Elf32_Ehdr hdr, const Elf_Shdr sechdrs,
	152	struct module *module)
	153	{
	154	return 0;
	155	}
	156
	157	void module_arch_cleanup(struct module *mod)
	158	{
	159	}