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

/* Kernel module help for sparc32.
 *
 * Copyright (C) 2001 Rusty Russell.
 * Copyright (C) 2002 David S. Miller.
 */

#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 <linux/ctype.h>

void *module_alloc(unsigned long size)
{
	void *ret;

	/* We handle the zero case fine, unlike vmalloc */
	if (size == 0)
		return NULL;

	ret = vmalloc(size);
	if (!ret)
		ret = ERR_PTR(-ENOMEM);
	else
		memset(ret, 0, size);

	return ret;
}

/* Free memory returned from module_core_alloc/module_init_alloc */
void module_free(struct module *mod, void *module_region)
{
	vfree(module_region);
	/* FIXME: If module_region == mod->init_region, trim exception
           table entries. */
}

/* Make generic code ignore STT_REGISTER dummy undefined symbols,
 * and replace references to .func with _Func
 */
int module_frob_arch_sections(Elf_Ehdr *hdr,
			      Elf_Shdr *sechdrs,
			      char *secstrings,
			      struct module *mod)
{
	unsigned int symidx;
	Elf32_Sym *sym;
	char *strtab;
	int i;

	for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
		if (symidx == hdr->e_shnum-1) {
			printk("%s: no symtab found.\n", mod->name);
			return -ENOEXEC;
		}
	}
	sym = (Elf32_Sym *)sechdrs[symidx].sh_addr;
	strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;

	for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
		if (sym[i].st_shndx == SHN_UNDEF) {
			if (ELF32_ST_TYPE(sym[i].st_info) == STT_REGISTER)
				sym[i].st_shndx = SHN_ABS;
			else {
				char *name = strtab + sym[i].st_name;
				if (name[0] == '.') {
					name[0] = '_';
					name[1] = toupper(name[1]);
				}
			}
		}
	}
	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: non-ADD 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 *rel = (void *)sechdrs[relsec].sh_addr;
	Elf32_Sym *sym;
	u8 *location;
	u32 *loc32;

	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
		Elf32_Addr v;

		/* This is where to make the change */
		location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
			+ rel[i].r_offset;
		loc32 = (u32 *) location;
		/* This is the symbol it is referring to.  Note that all
		   undefined symbols have been resolved.  */
		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
			+ ELF32_R_SYM(rel[i].r_info);
		v = sym->st_value + rel[i].r_addend;

		switch (ELF32_R_TYPE(rel[i].r_info)) {
		case R_SPARC_32:
		case R_SPARC_UA32:
			location[0] = v >> 24;
			location[1] = v >> 16;
			location[2] = v >>  8;
			location[3] = v >>  0;
			break;

		case R_SPARC_WDISP30:
			v -= (Elf32_Addr) location;
			*loc32 = (*loc32 & ~0x3fffffff) |
				((v >> 2) & 0x3fffffff);
			break;

		case R_SPARC_WDISP22:
			v -= (Elf32_Addr) location;
			*loc32 = (*loc32 & ~0x3fffff) |
				((v >> 2) & 0x3fffff);
			break;

		case R_SPARC_LO10:
			*loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
			break;

		case R_SPARC_HI22:
			*loc32 = (*loc32 & ~0x3fffff) |
				((v >> 10) & 0x3fffff);
			break;

		default:
			printk(KERN_ERR "module %s: Unknown relocation: %x\n",
			       me->name,
			       (int) (ELF32_R_TYPE(rel[i].r_info) & 0xff));
			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 sparc32.
	2	*
	3	* Copyright (C) 2001 Rusty Russell.
	4	* Copyright (C) 2002 David S. Miller.
	5	*/
	6
	7	#include <linux/moduleloader.h>
	8	#include <linux/kernel.h>
	9	#include <linux/elf.h>
	10	#include <linux/vmalloc.h>
	11	#include <linux/fs.h>
	12	#include <linux/string.h>
7caaeabb	13	#include <linux/ctype.h>
1da177e4 LT	14
	15	void *module_alloc(unsigned long size)
	16	{
	17	void *ret;
	18
	19	/* We handle the zero case fine, unlike vmalloc */
	20	if (size == 0)
	21	return NULL;
	22
	23	ret = vmalloc(size);
	24	if (!ret)
	25	ret = ERR_PTR(-ENOMEM);
	26	else
	27	memset(ret, 0, size);
	28
	29	return ret;
	30	}
	31
	32	/* Free memory returned from module_core_alloc/module_init_alloc */
	33	void module_free(struct module mod, void module_region)
	34	{
	35	vfree(module_region);
	36	/* FIXME: If module_region == mod->init_region, trim exception
	37	table entries. */
	38	}
	39
	40	/* Make generic code ignore STT_REGISTER dummy undefined symbols,
7caaeabb	41	* and replace references to .func with _Func
1da177e4 LT	42	*/
	43	int module_frob_arch_sections(Elf_Ehdr *hdr,
	44	Elf_Shdr *sechdrs,
	45	char *secstrings,
	46	struct module *mod)
	47	{
	48	unsigned int symidx;
	49	Elf32_Sym *sym;
	50	char *strtab;
	51	int i;
	52
	53	for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
	54	if (symidx == hdr->e_shnum-1) {
	55	printk("%s: no symtab found.\n", mod->name);
	56	return -ENOEXEC;
	57	}
	58	}
	59	sym = (Elf32_Sym *)sechdrs[symidx].sh_addr;
	60	strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
	61
	62	for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
	63	if (sym[i].st_shndx == SHN_UNDEF) {
	64	if (ELF32_ST_TYPE(sym[i].st_info) == STT_REGISTER)
	65	sym[i].st_shndx = SHN_ABS;
	66	else {
	67	char *name = strtab + sym[i].st_name;
7caaeabb AV	68	if (name[0] == '.') {
	69	name[0] = '_';
	70	name[1] = toupper(name[1]);
	71	}
1da177e4 LT	72	}
	73	}
	74	}
	75	return 0;
	76	}
	77
	78	int apply_relocate(Elf32_Shdr *sechdrs,
	79	const char *strtab,
	80	unsigned int symindex,
	81	unsigned int relsec,
	82	struct module *me)
	83	{
	84	printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
	85	me->name);
	86	return -ENOEXEC;
	87	}
	88
	89	int apply_relocate_add(Elf32_Shdr *sechdrs,
	90	const char *strtab,
	91	unsigned int symindex,
	92	unsigned int relsec,
	93	struct module *me)
	94	{
	95	unsigned int i;
	96	Elf32_Rela rel = (void )sechdrs[relsec].sh_addr;
	97	Elf32_Sym *sym;
	98	u8 *location;
	99	u32 *loc32;
	100
	101	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
	102	Elf32_Addr v;
	103
	104	/* This is where to make the change */
	105	location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
	106	+ rel[i].r_offset;
	107	loc32 = (u32 *) location;
	108	/* This is the symbol it is referring to. Note that all
	109	undefined symbols have been resolved. */
	110	sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
	111	+ ELF32_R_SYM(rel[i].r_info);
	112	v = sym->st_value + rel[i].r_addend;
	113
	114	switch (ELF32_R_TYPE(rel[i].r_info)) {
	115	case R_SPARC_32:
06a1be16	116	case R_SPARC_UA32:
1da177e4 LT	117	location[0] = v >> 24;
	118	location[1] = v >> 16;
	119	location[2] = v >> 8;
	120	location[3] = v >> 0;
	121	break;
	122
	123	case R_SPARC_WDISP30:
	124	v -= (Elf32_Addr) location;
	125	loc32 = (loc32 & ~0x3fffffff) \|
	126	((v >> 2) & 0x3fffffff);
	127	break;
	128
	129	case R_SPARC_WDISP22:
	130	v -= (Elf32_Addr) location;
	131	loc32 = (loc32 & ~0x3fffff) \|
	132	((v >> 2) & 0x3fffff);
	133	break;
	134
	135	case R_SPARC_LO10:
	136	loc32 = (loc32 & ~0x3ff) \| (v & 0x3ff);
	137	break;
	138
	139	case R_SPARC_HI22:
	140	loc32 = (loc32 & ~0x3fffff) \|
	141	((v >> 10) & 0x3fffff);
	142	break;
	143
	144	default:
	145	printk(KERN_ERR "module %s: Unknown relocation: %x\n",
	146	me->name,
	147	(int) (ELF32_R_TYPE(rel[i].r_info) & 0xff));
	148	return -ENOEXEC;
	149	};
	150	}
	151	return 0;
	152	}
	153
	154	int module_finalize(const Elf_Ehdr *hdr,
	155	const Elf_Shdr *sechdrs,
	156	struct module *me)
	157	{
	158	return 0;
	159	}
	160
	161	void module_arch_cleanup(struct module *mod)
	162	{
	163	}