[deliverable/linux.git] / arch / sparc / kernel / module_64.c

/* Kernel module help for sparc64.
 *
 * 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/slab.h>
#include <linux/mm.h>

#include <asm/processor.h>
#include <asm/spitfire.h>

static void *module_map(unsigned long size)
{
	struct vm_struct *area;

	size = PAGE_ALIGN(size);
	if (!size || size > MODULES_LEN)
		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);
}

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

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

	ret = module_map(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.  */
int module_frob_arch_sections(Elf_Ehdr *hdr,
			      Elf_Shdr *sechdrs,
			      char *secstrings,
			      struct module *mod)
{
	unsigned int symidx;
	Elf64_Sym *sym;
	const 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 = (Elf64_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 &&
		    ELF64_ST_TYPE(sym[i].st_info) == STT_REGISTER)
			sym[i].st_shndx = SHN_ABS;
	}
	return 0;
}

int apply_relocate(Elf64_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(Elf64_Shdr *sechdrs,
		       const char *strtab,
		       unsigned int symindex,
		       unsigned int relsec,
		       struct module *me)
{
	unsigned int i;
	Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
	Elf64_Sym *sym;
	u8 *location;
	u32 *loc32;

	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
		Elf64_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;

		BUG_ON(((u64)location >> (u64)32) != (u64)0);

		/* This is the symbol it is referring to.  Note that all
		   undefined symbols have been resolved.  */
		sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
			+ ELF64_R_SYM(rel[i].r_info);
		v = sym->st_value + rel[i].r_addend;

		switch (ELF64_R_TYPE(rel[i].r_info) & 0xff) {
		case R_SPARC_64:
			location[0] = v >> 56;
			location[1] = v >> 48;
			location[2] = v >> 40;
			location[3] = v >> 32;
			location[4] = v >> 24;
			location[5] = v >> 16;
			location[6] = v >>  8;
			location[7] = v >>  0;
			break;

		case R_SPARC_32:
			location[0] = v >> 24;
			location[1] = v >> 16;
			location[2] = v >>  8;
			location[3] = v >>  0;
			break;

		case R_SPARC_DISP32:
			v -= (Elf64_Addr) location;
			*loc32 = v;
			break;

		case R_SPARC_WDISP30:
			v -= (Elf64_Addr) location;
			*loc32 = (*loc32 & ~0x3fffffff) |
				((v >> 2) & 0x3fffffff);
			break;

		case R_SPARC_WDISP22:
			v -= (Elf64_Addr) location;
			*loc32 = (*loc32 & ~0x3fffff) |
				((v >> 2) & 0x3fffff);
			break;

		case R_SPARC_WDISP19:
			v -= (Elf64_Addr) location;
			*loc32 = (*loc32 & ~0x7ffff) |
				((v >> 2) & 0x7ffff);
			break;

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

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

		case R_SPARC_OLO10:
			*loc32 = (*loc32 & ~0x1fff) |
				(((v & 0x3ff) +
				  (ELF64_R_TYPE(rel[i].r_info) >> 8))
				 & 0x1fff);
			break;

		default:
			printk(KERN_ERR "module %s: Unknown relocation: %x\n",
			       me->name,
			       (int) (ELF64_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)
{
	/* Cheetah's I-cache is fully coherent.  */
	if (tlb_type == spitfire) {
		unsigned long va;

		flushw_all();
		for (va =  0; va < (PAGE_SIZE << 1); va += 32)
			spitfire_put_icache_tag(va, 0x0);
		__asm__ __volatile__("flush %g6");
	}

	return 0;
}

void module_arch_cleanup(struct module *mod)
{
}
Commit	Line	Data
1da177e4 LT	1	/* Kernel module help for sparc64.
	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>
	13	#include <linux/slab.h>
1da177e4 LT	14	#include <linux/mm.h>
	15
	16	#include <asm/processor.h>
	17	#include <asm/spitfire.h>
	18
	19	static void *module_map(unsigned long size)
	20	{
	21	struct vm_struct *area;
	22
	23	size = PAGE_ALIGN(size);
	24	if (!size \|\| size > MODULES_LEN)
	25	return NULL;
	26
	27	area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
	28	if (!area)
	29	return NULL;
	30
	31	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
	32	}
	33
	34	void *module_alloc(unsigned long size)
	35	{
	36	void *ret;
	37
	38	/* We handle the zero case fine, unlike vmalloc */
	39	if (size == 0)
	40	return NULL;
	41
	42	ret = module_map(size);
	43	if (!ret)
	44	ret = ERR_PTR(-ENOMEM);
	45	else
	46	memset(ret, 0, size);
	47
	48	return ret;
	49	}
	50
	51	/* Free memory returned from module_core_alloc/module_init_alloc */
	52	void module_free(struct module mod, void module_region)
	53	{
	54	vfree(module_region);
	55	/* FIXME: If module_region == mod->init_region, trim exception
	56	table entries. */
	57	}
	58
	59	/* Make generic code ignore STT_REGISTER dummy undefined symbols. */
	60	int module_frob_arch_sections(Elf_Ehdr *hdr,
	61	Elf_Shdr *sechdrs,
	62	char *secstrings,
	63	struct module *mod)
	64	{
	65	unsigned int symidx;
	66	Elf64_Sym *sym;
	67	const char *strtab;
	68	int i;
	69
	70	for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
	71	if (symidx == hdr->e_shnum-1) {
	72	printk("%s: no symtab found.\n", mod->name);
	73	return -ENOEXEC;
	74	}
	75	}
	76	sym = (Elf64_Sym *)sechdrs[symidx].sh_addr;
	77	strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
78
79	for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
80	if (sym[i].st_shndx == SHN_UNDEF &&
81	ELF64_ST_TYPE(sym[i].st_info) == STT_REGISTER)
82	sym[i].st_shndx = SHN_ABS;
83	}
84	return 0;
85	}
86
87	int apply_relocate(Elf64_Shdr *sechdrs,
88	const char *strtab,
89	unsigned int symindex,
90	unsigned int relsec,
91	struct module *me)
92	{
93	printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
94	me->name);
95	return -ENOEXEC;
96	}
97
98	int apply_relocate_add(Elf64_Shdr *sechdrs,
99	const char *strtab,
100	unsigned int symindex,
101	unsigned int relsec,
102	struct module *me)
103	{
104	unsigned int i;
105	Elf64_Rela rel = (void )sechdrs[relsec].sh_addr;
106	Elf64_Sym *sym;
107	u8 *location;
108	u32 *loc32;
109
110	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
111	Elf64_Addr v;
112
113	/* This is where to make the change */
114	location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
115	+ rel[i].r_offset;
116	loc32 = (u32 *) location;
117
118	BUG_ON(((u64)location >> (u64)32) != (u64)0);
119
120	/* This is the symbol it is referring to. Note that all
121	undefined symbols have been resolved. */
122	sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
123	+ ELF64_R_SYM(rel[i].r_info);
124	v = sym->st_value + rel[i].r_addend;
125
126	switch (ELF64_R_TYPE(rel[i].r_info) & 0xff) {
127	case R_SPARC_64:
128	location[0] = v >> 56;
129	location[1] = v >> 48;
130	location[2] = v >> 40;
131	location[3] = v >> 32;
132	location[4] = v >> 24;
133	location[5] = v >> 16;
134	location[6] = v >> 8;
135	location[7] = v >> 0;
136	break;
137
138	case R_SPARC_32:
139	location[0] = v >> 24;
140	location[1] = v >> 16;
141	location[2] = v >> 8;
142	location[3] = v >> 0;
143	break;
144
06a1be16 DM	145	case R_SPARC_DISP32:
	146	v -= (Elf64_Addr) location;
	147	*loc32 = v;
	148	break;
	149
1da177e4 LT	150	case R_SPARC_WDISP30:
	151	v -= (Elf64_Addr) location;
	152	loc32 = (loc32 & ~0x3fffffff) \|
	153	((v >> 2) & 0x3fffffff);
	154	break;
	155
	156	case R_SPARC_WDISP22:
	157	v -= (Elf64_Addr) location;
	158	loc32 = (loc32 & ~0x3fffff) \|
	159	((v >> 2) & 0x3fffff);
	160	break;
	161
	162	case R_SPARC_WDISP19:
	163	v -= (Elf64_Addr) location;
	164	loc32 = (loc32 & ~0x7ffff) \|
	165	((v >> 2) & 0x7ffff);
	166	break;
	167
	168	case R_SPARC_LO10:
	169	loc32 = (loc32 & ~0x3ff) \| (v & 0x3ff);
	170	break;
	171
	172	case R_SPARC_HI22:
	173	loc32 = (loc32 & ~0x3fffff) \|
	174	((v >> 10) & 0x3fffff);
	175	break;
	176
	177	case R_SPARC_OLO10:
	178	loc32 = (loc32 & ~0x1fff) \|
	179	(((v & 0x3ff) +
	180	(ELF64_R_TYPE(rel[i].r_info) >> 8))
	181	& 0x1fff);
	182	break;
	183
	184	default:
	185	printk(KERN_ERR "module %s: Unknown relocation: %x\n",
	186	me->name,
	187	(int) (ELF64_R_TYPE(rel[i].r_info) & 0xff));
	188	return -ENOEXEC;
	189	};
	190	}
	191	return 0;
	192	}
	193
	194	int module_finalize(const Elf_Ehdr *hdr,
	195	const Elf_Shdr *sechdrs,
	196	struct module *me)
	197	{
	198	/* Cheetah's I-cache is fully coherent. */
	199	if (tlb_type == spitfire) {
	200	unsigned long va;
	201
	202	flushw_all();
	203	for (va = 0; va < (PAGE_SIZE << 1); va += 32)
	204	spitfire_put_icache_tag(va, 0x0);
	205	__asm__ __volatile__("flush %g6");
	206	}
	207
	208	return 0;
	209	}
	210
	211	void module_arch_cleanup(struct module *mod)
	212	{
	213	}