[deliverable/linux.git] / arch / arm / kernel / module.c

/*
 *  linux/arch/arm/kernel/module.c
 *
 *  Copyright (C) 2002 Russell King.
 *
 * 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/config.h>
#include <linux/module.h>
#include <linux/moduleloader.h>
#include <linux/kernel.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>

#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.
 * MODULE_START is redefined here and not in asm/memory.h to avoid
 * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
 */
extern void _etext;
#undef MODULE_START
#define MODULE_START	(((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK)
#endif

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, MODULE_START, MODULE_END);
	if (!area)
		return NULL;

	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
}

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

			offset += sym->st_value - loc;
			if (offset & 3 ||
			    offset <= (s32)0xfc000000 ||
			    offset >= (s32)0x04000000) {
				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.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* Module allocation method suggested by Andi Kleen.
	11	*/
	12	#include <linux/config.h>
	13	#include <linux/module.h>
f339ab3d	14	#include <linux/moduleloader.h>
1da177e4 LT	15	#include <linux/kernel.h>
	16	#include <linux/elf.h>
	17	#include <linux/vmalloc.h>
	18	#include <linux/slab.h>
	19	#include <linux/fs.h>
	20	#include <linux/string.h>
	21
	22	#include <asm/pgtable.h>
	23
	24	#ifdef CONFIG_XIP_KERNEL
	25	/*
	26	* The XIP kernel text is mapped in the module area for modules and
	27	* some other stuff to work without any indirect relocations.
	28	* MODULE_START is redefined here and not in asm/memory.h to avoid
	29	* recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
	30	*/
	31	extern void _etext;
	32	#undef MODULE_START
	33	#define MODULE_START (((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK)
	34	#endif
	35
	36	void *module_alloc(unsigned long size)
	37	{
	38	struct vm_struct *area;
	39
	40	size = PAGE_ALIGN(size);
	41	if (!size)
	42	return NULL;
	43
	44	area = __get_vm_area(size, VM_ALLOC, MODULE_START, MODULE_END);
	45	if (!area)
	46	return NULL;
	47
	48	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
	49	}
	50
	51	void module_free(struct module module, void region)
	52	{
	53	vfree(region);
	54	}
	55
	56	int module_frob_arch_sections(Elf_Ehdr *hdr,
	57	Elf_Shdr *sechdrs,
	58	char *secstrings,
	59	struct module *mod)
	60	{
	61	return 0;
	62	}
	63
	64	int
	65	apply_relocate(Elf32_Shdr sechdrs, const char strtab, unsigned int symindex,
	66	unsigned int relindex, struct module *module)
	67	{
	68	Elf32_Shdr *symsec = sechdrs + symindex;
	69	Elf32_Shdr *relsec = sechdrs + relindex;
	70	Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
	71	Elf32_Rel rel = (void )relsec->sh_addr;
	72	unsigned int i;
	73
	74	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
	75	unsigned long loc;
	76	Elf32_Sym *sym;
	77	s32 offset;
	78
79	offset = ELF32_R_SYM(rel->r_info);
80	if (offset < 0 \|\| offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
81	printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
82	module->name, relindex, i);
83	return -ENOEXEC;
84	}
85
86	sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
87
88	if (rel->r_offset < 0 \|\| rel->r_offset > dstsec->sh_size - sizeof(u32)) {
89	printk(KERN_ERR "%s: out of bounds relocation, "
90	"section %d reloc %d offset %d size %d\n",
91	module->name, relindex, i, rel->r_offset,
92	dstsec->sh_size);
93	return -ENOEXEC;
94	}
95
96	loc = dstsec->sh_addr + rel->r_offset;
97
98	switch (ELF32_R_TYPE(rel->r_info)) {
99	case R_ARM_ABS32:
100	(u32 )loc += sym->st_value;
101	break;
102
103	case R_ARM_PC24:
104	offset = ((u32 )loc & 0x00ffffff) << 2;
105	if (offset & 0x02000000)
106	offset -= 0x04000000;
107
108	offset += sym->st_value - loc;
109	if (offset & 3 \|\|
110	offset <= (s32)0xfc000000 \|\|
111	offset >= (s32)0x04000000) {
112	printk(KERN_ERR
113	"%s: relocation out of range, section "
114	"%d reloc %d sym '%s'\n", module->name,
115	relindex, i, strtab + sym->st_name);
116	return -ENOEXEC;
117	}
118
119	offset >>= 2;
120
121	(u32 )loc &= 0xff000000;
122	(u32 )loc \|= offset & 0x00ffffff;
123	break;
124
125	default:
126	printk(KERN_ERR "%s: unknown relocation: %u\n",
127	module->name, ELF32_R_TYPE(rel->r_info));
128	return -ENOEXEC;
129	}
130	}
131	return 0;
132	}
133
134	int
135	apply_relocate_add(Elf32_Shdr sechdrs, const char strtab,
136	unsigned int symindex, unsigned int relsec, struct module *module)
137	{
138	printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
139	module->name);
140	return -ENOEXEC;
141	}
142
143	int
144	module_finalize(const Elf32_Ehdr hdr, const Elf_Shdr sechdrs,
145	struct module *module)
146	{
147	return 0;
148	}
149
150	void
151	module_arch_cleanup(struct module *mod)
152	{
153	}