[deliverable/linux.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>
#include <asm/unwind.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)
{
#ifdef CONFIG_ARM_UNWIND
	Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;

	for (s = sechdrs; s < sechdrs_end; s++) {
		if (strcmp(".ARM.exidx.init.text", secstrings + s->sh_name) == 0)
			mod->arch.unw_sec_init = s;
		else if (strcmp(".ARM.exidx.devinit.text", secstrings + s->sh_name) == 0)
			mod->arch.unw_sec_devinit = s;
		else if (strcmp(".ARM.exidx", secstrings + s->sh_name) == 0)
			mod->arch.unw_sec_core = s;
		else if (strcmp(".init.text", secstrings + s->sh_name) == 0)
			mod->arch.sec_init_text = s;
		else if (strcmp(".devinit.text", secstrings + s->sh_name) == 0)
			mod->arch.sec_devinit_text = s;
		else if (strcmp(".text", secstrings + s->sh_name) == 0)
			mod->arch.sec_core_text = s;
	}
#endif
	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_NONE:
			/* ignore */
			break;

		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;

	       case R_ARM_V4BX:
		       /* Preserve Rm and the condition code. Alter
			* other bits to re-code instruction as
			* MOV PC,Rm.
			*/
		       *(u32 *)loc &= 0xf000000f;
		       *(u32 *)loc |= 0x01a0f000;
		       break;

		case R_ARM_PREL31:
			offset = *(u32 *)loc + sym->st_value - loc;
			*(u32 *)loc = offset & 0x7fffffff;
			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;
}

#ifdef CONFIG_ARM_UNWIND
static void register_unwind_tables(struct module *mod)
{
	if (mod->arch.unw_sec_init && mod->arch.sec_init_text)
		mod->arch.unwind_init =
			unwind_table_add(mod->arch.unw_sec_init->sh_addr,
					 mod->arch.unw_sec_init->sh_size,
					 mod->arch.sec_init_text->sh_addr,
					 mod->arch.sec_init_text->sh_size);
	if (mod->arch.unw_sec_devinit && mod->arch.sec_devinit_text)
		mod->arch.unwind_devinit =
			unwind_table_add(mod->arch.unw_sec_devinit->sh_addr,
					 mod->arch.unw_sec_devinit->sh_size,
					 mod->arch.sec_devinit_text->sh_addr,
					 mod->arch.sec_devinit_text->sh_size);
	if (mod->arch.unw_sec_core && mod->arch.sec_core_text)
		mod->arch.unwind_core =
			unwind_table_add(mod->arch.unw_sec_core->sh_addr,
					 mod->arch.unw_sec_core->sh_size,
					 mod->arch.sec_core_text->sh_addr,
					 mod->arch.sec_core_text->sh_size);
}

static void unregister_unwind_tables(struct module *mod)
{
	unwind_table_del(mod->arch.unwind_init);
	unwind_table_del(mod->arch.unwind_devinit);
	unwind_table_del(mod->arch.unwind_core);
}
#else
static inline void register_unwind_tables(struct module *mod) { }
static inline void unregister_unwind_tables(struct module *mod) { }
#endif

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

void
module_arch_cleanup(struct module *mod)
{
	unregister_unwind_tables(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>
2e1926e7	25	#include <asm/unwind.h>
1da177e4 LT	26
	27	#ifdef CONFIG_XIP_KERNEL
	28	/*
	29	* The XIP kernel text is mapped in the module area for modules and
	30	* some other stuff to work without any indirect relocations.
ab4f2ee1	31	* MODULES_VADDR is redefined here and not in asm/memory.h to avoid
1da177e4 LT	32	* recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
1da177e4 LT	33	*/
ab4f2ee1	34	#undef MODULES_VADDR
37efe642	35	#define MODULES_VADDR (((unsigned long)_etext + ~PGDIR_MASK) & PGDIR_MASK)
1da177e4 LT	36	#endif
1da177e4 LT	37
6a570b28	38	#ifdef CONFIG_MMU
1da177e4 LT	39	void *module_alloc(unsigned long size)
	40	{
	41	struct vm_struct *area;
	42
	43	size = PAGE_ALIGN(size);
	44	if (!size)
	45	return NULL;
	46
ab4f2ee1	47	area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
1da177e4 LT	48	if (!area)
	49	return NULL;
	50
8ec53663	51	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
1da177e4	52	}
6a570b28 HC	53	#else /* CONFIG_MMU */
	54	void *module_alloc(unsigned long size)
	55	{
	56	return size == 0 ? NULL : vmalloc(size);
	57	}
	58	#endif /* !CONFIG_MMU */
1da177e4 LT	59
	60	void module_free(struct module module, void region)
	61	{
	62	vfree(region);
	63	}
	64
	65	int module_frob_arch_sections(Elf_Ehdr *hdr,
	66	Elf_Shdr *sechdrs,
	67	char *secstrings,
	68	struct module *mod)
	69	{
2e1926e7 CM	70	#ifdef CONFIG_ARM_UNWIND
	71	Elf_Shdr s, sechdrs_end = sechdrs + hdr->e_shnum;
	72
	73	for (s = sechdrs; s < sechdrs_end; s++) {
	74	if (strcmp(".ARM.exidx.init.text", secstrings + s->sh_name) == 0)
	75	mod->arch.unw_sec_init = s;
	76	else if (strcmp(".ARM.exidx.devinit.text", secstrings + s->sh_name) == 0)
	77	mod->arch.unw_sec_devinit = s;
	78	else if (strcmp(".ARM.exidx", secstrings + s->sh_name) == 0)
	79	mod->arch.unw_sec_core = s;
	80	else if (strcmp(".init.text", secstrings + s->sh_name) == 0)
	81	mod->arch.sec_init_text = s;
	82	else if (strcmp(".devinit.text", secstrings + s->sh_name) == 0)
	83	mod->arch.sec_devinit_text = s;
	84	else if (strcmp(".text", secstrings + s->sh_name) == 0)
	85	mod->arch.sec_core_text = s;
	86	}
	87	#endif
1da177e4 LT	88	return 0;
	89	}
	90
	91	int
	92	apply_relocate(Elf32_Shdr sechdrs, const char strtab, unsigned int symindex,
	93	unsigned int relindex, struct module *module)
	94	{
	95	Elf32_Shdr *symsec = sechdrs + symindex;
	96	Elf32_Shdr *relsec = sechdrs + relindex;
	97	Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
	98	Elf32_Rel rel = (void )relsec->sh_addr;
	99	unsigned int i;
	100
	101	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
	102	unsigned long loc;
	103	Elf32_Sym *sym;
	104	s32 offset;
	105
	106	offset = ELF32_R_SYM(rel->r_info);
	107	if (offset < 0 \|\| offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
	108	printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
	109	module->name, relindex, i);
	110	return -ENOEXEC;
	111	}
	112
	113	sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
	114
	115	if (rel->r_offset < 0 \|\| rel->r_offset > dstsec->sh_size - sizeof(u32)) {
	116	printk(KERN_ERR "%s: out of bounds relocation, "
	117	"section %d reloc %d offset %d size %d\n",
	118	module->name, relindex, i, rel->r_offset,
	119	dstsec->sh_size);
	120	return -ENOEXEC;
	121	}
	122
	123	loc = dstsec->sh_addr + rel->r_offset;
	124
	125	switch (ELF32_R_TYPE(rel->r_info)) {
2e1926e7 CM	126	case R_ARM_NONE:
	127	/* ignore */
	128	break;
	129
1da177e4 LT	130	case R_ARM_ABS32:
	131	(u32 )loc += sym->st_value;
	132	break;
	133
	134	case R_ARM_PC24:
c2e26114 DJ	135	case R_ARM_CALL:
c2e26114 DJ	136	case R_ARM_JUMP24:
1da177e4 LT	137	offset = ((u32 )loc & 0x00ffffff) << 2;
	138	if (offset & 0x02000000)
	139	offset -= 0x04000000;
	140
	141	offset += sym->st_value - loc;
	142	if (offset & 3 \|\|
c5f12503 KW	143	offset <= (s32)0xfe000000 \|\|
c5f12503 KW	144	offset >= (s32)0x02000000) {
1da177e4 LT	145	printk(KERN_ERR
	146	"%s: relocation out of range, section "
	147	"%d reloc %d sym '%s'\n", module->name,
	148	relindex, i, strtab + sym->st_name);
	149	return -ENOEXEC;
	150	}
	151
	152	offset >>= 2;
	153
	154	(u32 )loc &= 0xff000000;
	155	(u32 )loc \|= offset & 0x00ffffff;
	156	break;
	157
4731f8b6 DS	158	case R_ARM_V4BX:
	159	/* Preserve Rm and the condition code. Alter
	160	* other bits to re-code instruction as
	161	* MOV PC,Rm.
	162	*/
	163	(u32 )loc &= 0xf000000f;
	164	(u32 )loc \|= 0x01a0f000;
	165	break;
	166
2e1926e7 CM	167	case R_ARM_PREL31:
	168	offset = (u32 )loc + sym->st_value - loc;
	169	(u32 )loc = offset & 0x7fffffff;
	170	break;
	171
1da177e4 LT	172	default:
	173	printk(KERN_ERR "%s: unknown relocation: %u\n",
	174	module->name, ELF32_R_TYPE(rel->r_info));
	175	return -ENOEXEC;
	176	}
	177	}
	178	return 0;
	179	}
	180
	181	int
	182	apply_relocate_add(Elf32_Shdr sechdrs, const char strtab,
	183	unsigned int symindex, unsigned int relsec, struct module *module)
	184	{
	185	printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
	186	module->name);
	187	return -ENOEXEC;
	188	}
	189
2e1926e7 CM	190	#ifdef CONFIG_ARM_UNWIND
	191	static void register_unwind_tables(struct module *mod)
	192	{
	193	if (mod->arch.unw_sec_init && mod->arch.sec_init_text)
	194	mod->arch.unwind_init =
	195	unwind_table_add(mod->arch.unw_sec_init->sh_addr,
	196	mod->arch.unw_sec_init->sh_size,
	197	mod->arch.sec_init_text->sh_addr,
	198	mod->arch.sec_init_text->sh_size);
	199	if (mod->arch.unw_sec_devinit && mod->arch.sec_devinit_text)
	200	mod->arch.unwind_devinit =
	201	unwind_table_add(mod->arch.unw_sec_devinit->sh_addr,
	202	mod->arch.unw_sec_devinit->sh_size,
	203	mod->arch.sec_devinit_text->sh_addr,
	204	mod->arch.sec_devinit_text->sh_size);
	205	if (mod->arch.unw_sec_core && mod->arch.sec_core_text)
	206	mod->arch.unwind_core =
	207	unwind_table_add(mod->arch.unw_sec_core->sh_addr,
	208	mod->arch.unw_sec_core->sh_size,
	209	mod->arch.sec_core_text->sh_addr,
	210	mod->arch.sec_core_text->sh_size);
	211	}
	212
	213	static void unregister_unwind_tables(struct module *mod)
	214	{
	215	unwind_table_del(mod->arch.unwind_init);
	216	unwind_table_del(mod->arch.unwind_devinit);
	217	unwind_table_del(mod->arch.unwind_core);
	218	}
	219	#else
	220	static inline void register_unwind_tables(struct module *mod) { }
	221	static inline void unregister_unwind_tables(struct module *mod) { }
	222	#endif
	223
1da177e4 LT	224	int
	225	module_finalize(const Elf32_Ehdr hdr, const Elf_Shdr sechdrs,
	226	struct module *module)
	227	{
2e1926e7	228	register_unwind_tables(module);
1da177e4 LT	229	return 0;
	230	}
	231
	232	void
	233	module_arch_cleanup(struct module *mod)
	234	{
2e1926e7	235	unregister_unwind_tables(mod);
1da177e4	236	}