[linux-block.git] / arch / arm / kernel / module.c

/*
 *  linux/arch/arm/kernel/module.c
 *
 *  Copyright (C) 2002 Russell King.
 *  Modified for nommu by Hyok S. Choi
 *
 * 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.
 *
 * Module allocation method suggested by Andi Kleen.
 */
#include <linux/module.h>
#include <linux/moduleloader.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/string.h>

#include <asm/pgtable.h>
#include <asm/sections.h>

#ifdef CONFIG_XIP_KERNEL
/*
 * The XIP kernel text is mapped in the module area for modules and
 * some other stuff to work without any indirect relocations.
 * MODULES_VADDR is redefined here and not in asm/memory.h to avoid
 * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
 */
#undef MODULES_VADDR
#define MODULES_VADDR	(((unsigned long)_etext + ~PGDIR_MASK) & PGDIR_MASK)
#endif

#ifdef CONFIG_MMU
void *module_alloc(unsigned long size)
{
	struct vm_struct *area;

	size = PAGE_ALIGN(size);
	if (!size)
		return NULL;

	area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
	if (!area)
		return NULL;

	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
}
#else /* CONFIG_MMU */
void *module_alloc(unsigned long size)
{
	return size == 0 ? NULL : vmalloc(size);
}
#endif /* !CONFIG_MMU */

void module_free(struct module *module, void *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 relindex, struct module *module)
{
	Elf32_Shdr *symsec = sechdrs + symindex;
	Elf32_Shdr *relsec = sechdrs + relindex;
	Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
	Elf32_Rel *rel = (void *)relsec->sh_addr;
	unsigned int i;

	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
		unsigned long loc;
		Elf32_Sym *sym;
		s32 offset;

		offset = ELF32_R_SYM(rel->r_info);
		if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
			printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
				module->name, relindex, i);
			return -ENOEXEC;
		}

		sym = ((Elf32_Sym *)symsec->sh_addr) + offset;

		if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) {
			printk(KERN_ERR "%s: out of bounds relocation, "
				"section %d reloc %d offset %d size %d\n",
				module->name, relindex, i, rel->r_offset,
				dstsec->sh_size);
			return -ENOEXEC;
		}

		loc = dstsec->sh_addr + rel->r_offset;

		switch (ELF32_R_TYPE(rel->r_info)) {
		case R_ARM_ABS32:
			*(u32 *)loc += sym->st_value;
			break;

		case R_ARM_PC24:
		case R_ARM_CALL:
		case R_ARM_JUMP24:
			offset = (*(u32 *)loc & 0x00ffffff) << 2;
			if (offset & 0x02000000)
				offset -= 0x04000000;

			offset += sym->st_value - loc;
			if (offset & 3 ||
			    offset <= (s32)0xfe000000 ||
			    offset >= (s32)0x02000000) {
				printk(KERN_ERR
				       "%s: relocation out of range, section "
				       "%d reloc %d sym '%s'\n", module->name,
				       relindex, i, strtab + sym->st_name);
				return -ENOEXEC;
			}

			offset >>= 2;

			*(u32 *)loc &= 0xff000000;
			*(u32 *)loc |= offset & 0x00ffffff;
			break;

		default:
			printk(KERN_ERR "%s: unknown relocation: %u\n",
			       module->name, ELF32_R_TYPE(rel->r_info));
			return -ENOEXEC;
		}
	}
	return 0;
}

int
apply_relocate_add(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
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
1da177e4 LT	1	/*
	2	* linux/arch/arm/kernel/module.c
	3	*
	4	* Copyright (C) 2002 Russell King.
6a570b28	5	* Modified for nommu by Hyok S. Choi
1da177e4 LT	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* Module allocation method suggested by Andi Kleen.
	12	*/
1da177e4	13	#include <linux/module.h>
f339ab3d	14	#include <linux/moduleloader.h>
1da177e4	15	#include <linux/kernel.h>
27ac792c	16	#include <linux/mm.h>
1da177e4 LT	17	#include <linux/elf.h>
	18	#include <linux/vmalloc.h>
	19	#include <linux/slab.h>
	20	#include <linux/fs.h>
	21	#include <linux/string.h>
	22
	23	#include <asm/pgtable.h>
37efe642	24	#include <asm/sections.h>
1da177e4 LT	25
	26	#ifdef CONFIG_XIP_KERNEL
	27	/*
	28	* The XIP kernel text is mapped in the module area for modules and
	29	* some other stuff to work without any indirect relocations.
ab4f2ee1	30	* MODULES_VADDR is redefined here and not in asm/memory.h to avoid
1da177e4 LT	31	* recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
1da177e4 LT	32	*/
ab4f2ee1	33	#undef MODULES_VADDR
37efe642	34	#define MODULES_VADDR (((unsigned long)_etext + ~PGDIR_MASK) & PGDIR_MASK)
1da177e4 LT	35	#endif
1da177e4 LT	36
6a570b28	37	#ifdef CONFIG_MMU
1da177e4 LT	38	void *module_alloc(unsigned long size)
	39	{
	40	struct vm_struct *area;
	41
	42	size = PAGE_ALIGN(size);
	43	if (!size)
	44	return NULL;
	45
ab4f2ee1	46	area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
1da177e4 LT	47	if (!area)
	48	return NULL;
	49
8ec53663	50	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
1da177e4	51	}
6a570b28 HC	52	#else /* CONFIG_MMU */
	53	void *module_alloc(unsigned long size)
	54	{
	55	return size == 0 ? NULL : vmalloc(size);
	56	}
	57	#endif /* !CONFIG_MMU */
1da177e4 LT	58
	59	void module_free(struct module module, void region)
	60	{
	61	vfree(region);
	62	}
	63
	64	int module_frob_arch_sections(Elf_Ehdr *hdr,
	65	Elf_Shdr *sechdrs,
	66	char *secstrings,
	67	struct module *mod)
	68	{
	69	return 0;
	70	}
	71
	72	int
	73	apply_relocate(Elf32_Shdr sechdrs, const char strtab, unsigned int symindex,
	74	unsigned int relindex, struct module *module)
	75	{
	76	Elf32_Shdr *symsec = sechdrs + symindex;
	77	Elf32_Shdr *relsec = sechdrs + relindex;
	78	Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
	79	Elf32_Rel rel = (void )relsec->sh_addr;
	80	unsigned int i;
	81
	82	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
	83	unsigned long loc;
	84	Elf32_Sym *sym;
	85	s32 offset;
	86
	87	offset = ELF32_R_SYM(rel->r_info);
	88	if (offset < 0 \|\| offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
	89	printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
	90	module->name, relindex, i);
	91	return -ENOEXEC;
	92	}
	93
	94	sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
	95
	96	if (rel->r_offset < 0 \|\| rel->r_offset > dstsec->sh_size - sizeof(u32)) {
	97	printk(KERN_ERR "%s: out of bounds relocation, "
	98	"section %d reloc %d offset %d size %d\n",
	99	module->name, relindex, i, rel->r_offset,
	100	dstsec->sh_size);
	101	return -ENOEXEC;
	102	}
	103
	104	loc = dstsec->sh_addr + rel->r_offset;
	105
	106	switch (ELF32_R_TYPE(rel->r_info)) {
	107	case R_ARM_ABS32:
	108	(u32 )loc += sym->st_value;
	109	break;
	110
	111	case R_ARM_PC24:
c2e26114 DJ	112	case R_ARM_CALL:
c2e26114 DJ	113	case R_ARM_JUMP24:
1da177e4 LT	114	offset = ((u32 )loc & 0x00ffffff) << 2;
	115	if (offset & 0x02000000)
	116	offset -= 0x04000000;
	117
	118	offset += sym->st_value - loc;
	119	if (offset & 3 \|\|
c5f12503 KW	120	offset <= (s32)0xfe000000 \|\|
c5f12503 KW	121	offset >= (s32)0x02000000) {
1da177e4 LT	122	printk(KERN_ERR
	123	"%s: relocation out of range, section "
	124	"%d reloc %d sym '%s'\n", module->name,
	125	relindex, i, strtab + sym->st_name);
	126	return -ENOEXEC;
	127	}
	128
	129	offset >>= 2;
	130
	131	(u32 )loc &= 0xff000000;
	132	(u32 )loc \|= offset & 0x00ffffff;
	133	break;
	134
	135	default:
	136	printk(KERN_ERR "%s: unknown relocation: %u\n",
	137	module->name, ELF32_R_TYPE(rel->r_info));
	138	return -ENOEXEC;
	139	}
	140	}
	141	return 0;
	142	}
	143
	144	int
	145	apply_relocate_add(Elf32_Shdr sechdrs, const char strtab,
	146	unsigned int symindex, unsigned int relsec, struct module *module)
	147	{
	148	printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
	149	module->name);
	150	return -ENOEXEC;
	151	}
	152
	153	int
	154	module_finalize(const Elf32_Ehdr hdr, const Elf_Shdr sechdrs,
	155	struct module *module)
	156	{
	157	return 0;
	158	}
	159
	160	void
	161	module_arch_cleanup(struct module *mod)
	162	{
	163	}