[mirror_ubuntu-focal-kernel.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>

#ifdef CONFIG_SPARC64
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);
}

static char *dot2underscore(char *name)
{
	return name;
}
#endif /* CONFIG_SPARC64 */

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;
	Elf_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 = (Elf_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 (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
				sym[i].st_shndx = SHN_ABS;
			} else {
				char *name = strtab + sym[i].st_name;
				dot2underscore(name);
			}
		}
	}
	return 0;
}

int apply_relocate(Elf_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(Elf_Shdr *sechdrs,
		       const char *strtab,
		       unsigned int symindex,
		       unsigned int relsec,
		       struct module *me)
{
	unsigned int i;
	Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
	Elf_Sym *sym;
	u8 *location;
	u32 *loc32;

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

#ifdef CONFIG_SPARC64
		BUG_ON(((u64)location >> (u64)32) != (u64)0);
#endif /* CONFIG_SPARC64 */

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

		switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
#ifdef CONFIG_SPARC64
		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_DISP32:
			v -= (Elf_Addr) location;
			*loc32 = v;
			break;

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

		case R_SPARC_OLO10:
			*loc32 = (*loc32 & ~0x1fff) |
				(((v & 0x3ff) +
				  (ELF_R_TYPE(rel[i].r_info) >> 8))
				 & 0x1fff);
			break;
#endif /* CONFIG_SPARC64 */

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

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

		case R_SPARC_WDISP22:
			v -= (Elf_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) (ELF_R_TYPE(rel[i].r_info) & 0xff));
			return -ENOEXEC;
		};
	}
	return 0;
}

#ifdef CONFIG_SPARC64
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;
}
#endif /* CONFIG_SPARC64 */

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
627bf2f6	19	#ifdef CONFIG_SPARC64
1da177e4 LT	20	static void *module_map(unsigned long size)
	21	{
	22	struct vm_struct *area;
	23
	24	size = PAGE_ALIGN(size);
	25	if (!size \|\| size > MODULES_LEN)
	26	return NULL;
	27
	28	area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
	29	if (!area)
	30	return NULL;
	31
	32	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
	33	}
	34
627bf2f6 SR	35	static char dot2underscore(char name)
	36	{
	37	return name;
	38	}
	39	#endif /* CONFIG_SPARC64 */
	40
1da177e4 LT	41	void *module_alloc(unsigned long size)
	42	{
	43	void *ret;
	44
	45	/* We handle the zero case fine, unlike vmalloc */
	46	if (size == 0)
	47	return NULL;
	48
	49	ret = module_map(size);
	50	if (!ret)
	51	ret = ERR_PTR(-ENOMEM);
	52	else
	53	memset(ret, 0, size);
	54
	55	return ret;
	56	}
	57
	58	/* Free memory returned from module_core_alloc/module_init_alloc */
	59	void module_free(struct module mod, void module_region)
	60	{
	61	vfree(module_region);
	62	/* FIXME: If module_region == mod->init_region, trim exception
	63	table entries. */
	64	}
	65
	66	/* Make generic code ignore STT_REGISTER dummy undefined symbols. */
	67	int module_frob_arch_sections(Elf_Ehdr *hdr,
	68	Elf_Shdr *sechdrs,
	69	char *secstrings,
	70	struct module *mod)
	71	{
	72	unsigned int symidx;
c45d1c20	73	Elf_Sym *sym;
627bf2f6	74	char *strtab;
1da177e4 LT	75	int i;
	76
	77	for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
	78	if (symidx == hdr->e_shnum-1) {
	79	printk("%s: no symtab found.\n", mod->name);
	80	return -ENOEXEC;
	81	}
	82	}
c45d1c20	83	sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
1da177e4 LT	84	strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
	85
	86	for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
627bf2f6 SR	87	if (sym[i].st_shndx == SHN_UNDEF) {
	88	if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
	89	sym[i].st_shndx = SHN_ABS;
	90	} else {
	91	char *name = strtab + sym[i].st_name;
	92	dot2underscore(name);
	93	}
	94	}
1da177e4 LT	95	}
	96	return 0;
	97	}
	98
c45d1c20	99	int apply_relocate(Elf_Shdr *sechdrs,
1da177e4 LT	100	const char *strtab,
	101	unsigned int symindex,
	102	unsigned int relsec,
	103	struct module *me)
	104	{
	105	printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
	106	me->name);
	107	return -ENOEXEC;
	108	}
	109
c45d1c20	110	int apply_relocate_add(Elf_Shdr *sechdrs,
1da177e4 LT	111	const char *strtab,
	112	unsigned int symindex,
	113	unsigned int relsec,
	114	struct module *me)
	115	{
	116	unsigned int i;
c45d1c20 SR	117	Elf_Rela rel = (void )sechdrs[relsec].sh_addr;
c45d1c20 SR	118	Elf_Sym *sym;
1da177e4 LT	119	u8 *location;
	120	u32 *loc32;
	121
	122	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
c45d1c20	123	Elf_Addr v;
1da177e4 LT	124
	125	/* This is where to make the change */
	126	location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
	127	+ rel[i].r_offset;
	128	loc32 = (u32 *) location;
	129
627bf2f6	130	#ifdef CONFIG_SPARC64
1da177e4	131	BUG_ON(((u64)location >> (u64)32) != (u64)0);
627bf2f6	132	#endif /* CONFIG_SPARC64 */
1da177e4 LT	133
	134	/* This is the symbol it is referring to. Note that all
	135	undefined symbols have been resolved. */
c45d1c20 SR	136	sym = (Elf_Sym *)sechdrs[symindex].sh_addr
c45d1c20 SR	137	+ ELF_R_SYM(rel[i].r_info);
1da177e4 LT	138	v = sym->st_value + rel[i].r_addend;
1da177e4 LT	139
c45d1c20	140	switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
627bf2f6	141	#ifdef CONFIG_SPARC64
1da177e4 LT	142	case R_SPARC_64:
	143	location[0] = v >> 56;
	144	location[1] = v >> 48;
	145	location[2] = v >> 40;
	146	location[3] = v >> 32;
	147	location[4] = v >> 24;
	148	location[5] = v >> 16;
	149	location[6] = v >> 8;
	150	location[7] = v >> 0;
	151	break;
	152
627bf2f6 SR	153	case R_SPARC_DISP32:
	154	v -= (Elf_Addr) location;
	155	*loc32 = v;
	156	break;
	157
	158	case R_SPARC_WDISP19:
	159	v -= (Elf_Addr) location;
	160	loc32 = (loc32 & ~0x7ffff) \|
	161	((v >> 2) & 0x7ffff);
	162	break;
	163
	164	case R_SPARC_OLO10:
	165	loc32 = (loc32 & ~0x1fff) \|
	166	(((v & 0x3ff) +
	167	(ELF_R_TYPE(rel[i].r_info) >> 8))
	168	& 0x1fff);
	169	break;
	170	#endif /* CONFIG_SPARC64 */
	171
1da177e4 LT	172	case R_SPARC_32:
	173	location[0] = v >> 24;
	174	location[1] = v >> 16;
	175	location[2] = v >> 8;
	176	location[3] = v >> 0;
	177	break;
	178
	179	case R_SPARC_WDISP30:
c45d1c20	180	v -= (Elf_Addr) location;
1da177e4 LT	181	loc32 = (loc32 & ~0x3fffffff) \|
	182	((v >> 2) & 0x3fffffff);
	183	break;
	184
	185	case R_SPARC_WDISP22:
c45d1c20	186	v -= (Elf_Addr) location;
1da177e4 LT	187	loc32 = (loc32 & ~0x3fffff) \|
	188	((v >> 2) & 0x3fffff);
	189	break;
	190
1da177e4 LT	191	case R_SPARC_LO10:
	192	loc32 = (loc32 & ~0x3ff) \| (v & 0x3ff);
	193	break;
	194
	195	case R_SPARC_HI22:
	196	loc32 = (loc32 & ~0x3fffff) \|
	197	((v >> 10) & 0x3fffff);
	198	break;
	199
1da177e4 LT	200	default:
	201	printk(KERN_ERR "module %s: Unknown relocation: %x\n",
	202	me->name,
c45d1c20	203	(int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
1da177e4 LT	204	return -ENOEXEC;
	205	};
	206	}
	207	return 0;
	208	}
	209
627bf2f6	210	#ifdef CONFIG_SPARC64
1da177e4 LT	211	int module_finalize(const Elf_Ehdr *hdr,
	212	const Elf_Shdr *sechdrs,
	213	struct module *me)
	214	{
	215	/* Cheetah's I-cache is fully coherent. */
	216	if (tlb_type == spitfire) {
	217	unsigned long va;
	218
	219	flushw_all();
	220	for (va = 0; va < (PAGE_SIZE << 1); va += 32)
	221	spitfire_put_icache_tag(va, 0x0);
	222	__asm__ __volatile__("flush %g6");
	223	}
	224
	225	return 0;
	226	}
627bf2f6	227	#endif /* CONFIG_SPARC64 */
1da177e4 LT	228
	229	void module_arch_cleanup(struct module *mod)
	230	{
	231	}