[linux-2.6-block.git] / arch / cris / kernel / module.c

/*  Kernel module help for i386.
    Copyright (C) 2001 Rusty Russell.

    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>

#if 0
#define DEBUGP printk
#else
#define DEBUGP(fmt , ...)
#endif

#ifdef CONFIG_ETRAX_KMALLOCED_MODULES
#define MALLOC_MODULE(size) kmalloc(size, GFP_KERNEL)
#define FREE_MODULE(region) kfree(region)
#else
#define MALLOC_MODULE(size) vmalloc_exec(size)
#define FREE_MODULE(region) vfree(region)
#endif

void *module_alloc(unsigned long size)
{
	if (size == 0)
		return NULL;
	return MALLOC_MODULE(size);
}


/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
	FREE_MODULE(module_region);
}

/* 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(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 apply_relocate_add(Elf32_Shdr *sechdrs,
		       const char *strtab,
		       unsigned int symindex,
		       unsigned int relsec,
		       struct module *me)
{
  	unsigned int i;
	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;

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

	for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) {
		/* This is where to make the change */
		uint32_t *loc
			= ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
			   + rela[i].r_offset);
		/* This is the symbol it is referring to.  Note that all
		   undefined symbols have been resolved.  */
		Elf32_Sym *sym
			= ((Elf32_Sym *)sechdrs[symindex].sh_addr
			   + ELF32_R_SYM (rela[i].r_info));
		switch (ELF32_R_TYPE(rela[i].r_info)) {
		case R_CRIS_32:
			*loc = sym->st_value + rela[i].r_addend;
			break;
		case R_CRIS_32_PCREL:
			*loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4;
			 break;
		default:
			printk(KERN_ERR "module %s: Unknown relocation: %u\n",
			       me->name, ELF32_R_TYPE(rela[i].r_info));
			return -ENOEXEC;
		}
	}

	return 0;
}

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 i386.
	2	Copyright (C) 2001 Rusty Russell.
	3
	4	This program is free software; you can redistribute it and/or modify
	5	it under the terms of the GNU General Public License as published by
	6	the Free Software Foundation; either version 2 of the License, or
	7	(at your option) any later version.
	8
	9	This program is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	GNU General Public License for more details.
	13
	14	You should have received a copy of the GNU General Public License
	15	along with this program; if not, write to the Free Software
	16	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*/
	18	#include <linux/moduleloader.h>
	19	#include <linux/elf.h>
	20	#include <linux/vmalloc.h>
	21	#include <linux/fs.h>
	22	#include <linux/string.h>
	23	#include <linux/kernel.h>
	24
	25	#if 0
	26	#define DEBUGP printk
	27	#else
	28	#define DEBUGP(fmt , ...)
	29	#endif
	30
08cfeacb JN	31	#ifdef CONFIG_ETRAX_KMALLOCED_MODULES
	32	#define MALLOC_MODULE(size) kmalloc(size, GFP_KERNEL)
	33	#define FREE_MODULE(region) kfree(region)
	34	#else
	35	#define MALLOC_MODULE(size) vmalloc_exec(size)
	36	#define FREE_MODULE(region) vfree(region)
	37	#endif
	38
1da177e4 LT	39	void *module_alloc(unsigned long size)
	40	{
	41	if (size == 0)
	42	return NULL;
08cfeacb	43	return MALLOC_MODULE(size);
1da177e4 LT	44	}
	45
	46
	47	/* Free memory returned from module_alloc */
	48	void module_free(struct module mod, void module_region)
	49	{
08cfeacb	50	FREE_MODULE(module_region);
1da177e4 LT	51	}
	52
	53	/* We don't need anything special. */
	54	int module_frob_arch_sections(Elf_Ehdr *hdr,
	55	Elf_Shdr *sechdrs,
	56	char *secstrings,
	57	struct module *mod)
	58	{
	59	return 0;
	60	}
	61
	62	int apply_relocate(Elf32_Shdr *sechdrs,
	63	const char *strtab,
	64	unsigned int symindex,
	65	unsigned int relsec,
	66	struct module *me)
	67	{
5d01e6ce MS	68	printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
5d01e6ce MS	69	return -ENOEXEC;
1da177e4 LT	70	}
	71
	72	int apply_relocate_add(Elf32_Shdr *sechdrs,
	73	const char *strtab,
	74	unsigned int symindex,
	75	unsigned int relsec,
	76	struct module *me)
	77	{
	78	unsigned int i;
	79	Elf32_Rela rela = (void )sechdrs[relsec].sh_addr;
	80
5d01e6ce	81	DEBUGP ("Applying add relocate section %u to %u\n", relsec,
1da177e4 LT	82	sechdrs[relsec].sh_info);
	83
	84	for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) {
	85	/* This is where to make the change */
	86	uint32_t *loc
	87	= ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
	88	+ rela[i].r_offset);
	89	/* This is the symbol it is referring to. Note that all
	90	undefined symbols have been resolved. */
	91	Elf32_Sym *sym
	92	= ((Elf32_Sym *)sechdrs[symindex].sh_addr
	93	+ ELF32_R_SYM (rela[i].r_info));
5d01e6ce MS	94	switch (ELF32_R_TYPE(rela[i].r_info)) {
	95	case R_CRIS_32:
	96	*loc = sym->st_value + rela[i].r_addend;
	97	break;
	98	case R_CRIS_32_PCREL:
	99	*loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4;
	100	break;
	101	default:
	102	printk(KERN_ERR "module %s: Unknown relocation: %u\n",
	103	me->name, ELF32_R_TYPE(rela[i].r_info));
	104	return -ENOEXEC;
	105	}
1da177e4 LT	106	}
	107
	108	return 0;
	109	}
	110
	111	int module_finalize(const Elf_Ehdr *hdr,
	112	const Elf_Shdr *sechdrs,
	113	struct module *me)
	114	{
	115	return 0;
	116	}
	117
	118	void module_arch_cleanup(struct module *mod)
	119	{
	120	}