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/arch/sparc64/kernel/module.c

https://bitbucket.org/evzijst/gittest
C | 209 lines | 162 code | 33 blank | 14 comment | 20 complexity | 4b6481334cb914a4f3076db7993d8c7c MD5 | raw file
  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>
 14#include <linux/vmalloc.h>
 15#include <linux/mm.h>
 16
 17#include <asm/processor.h>
 18#include <asm/spitfire.h>
 19
 20static 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
 35void *module_alloc(unsigned long size)
 36{
 37	void *ret;
 38
 39	/* We handle the zero case fine, unlike vmalloc */
 40	if (size == 0)
 41		return NULL;
 42
 43	ret = module_map(size);
 44	if (!ret)
 45		ret = ERR_PTR(-ENOMEM);
 46	else
 47		memset(ret, 0, size);
 48
 49	return ret;
 50}
 51
 52/* Free memory returned from module_core_alloc/module_init_alloc */
 53void module_free(struct module *mod, void *module_region)
 54{
 55	vfree(module_region);
 56	/* FIXME: If module_region == mod->init_region, trim exception
 57           table entries. */
 58}
 59
 60/* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
 61int module_frob_arch_sections(Elf_Ehdr *hdr,
 62			      Elf_Shdr *sechdrs,
 63			      char *secstrings,
 64			      struct module *mod)
 65{
 66	unsigned int symidx;
 67	Elf64_Sym *sym;
 68	const char *strtab;
 69	int i;
 70
 71	for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
 72		if (symidx == hdr->e_shnum-1) {
 73			printk("%s: no symtab found.\n", mod->name);
 74			return -ENOEXEC;
 75		}
 76	}
 77	sym = (Elf64_Sym *)sechdrs[symidx].sh_addr;
 78	strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
 79
 80	for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
 81		if (sym[i].st_shndx == SHN_UNDEF &&
 82		    ELF64_ST_TYPE(sym[i].st_info) == STT_REGISTER)
 83			sym[i].st_shndx = SHN_ABS;
 84	}
 85	return 0;
 86}
 87
 88int apply_relocate(Elf64_Shdr *sechdrs,
 89		   const char *strtab,
 90		   unsigned int symindex,
 91		   unsigned int relsec,
 92		   struct module *me)
 93{
 94	printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
 95	       me->name);
 96	return -ENOEXEC;
 97}
 98
 99int apply_relocate_add(Elf64_Shdr *sechdrs,
100		       const char *strtab,
101		       unsigned int symindex,
102		       unsigned int relsec,
103		       struct module *me)
104{
105	unsigned int i;
106	Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
107	Elf64_Sym *sym;
108	u8 *location;
109	u32 *loc32;
110
111	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
112		Elf64_Addr v;
113
114		/* This is where to make the change */
115		location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
116			+ rel[i].r_offset;
117		loc32 = (u32 *) location;
118
119		BUG_ON(((u64)location >> (u64)32) != (u64)0);
120
121		/* This is the symbol it is referring to.  Note that all
122		   undefined symbols have been resolved.  */
123		sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
124			+ ELF64_R_SYM(rel[i].r_info);
125		v = sym->st_value + rel[i].r_addend;
126
127		switch (ELF64_R_TYPE(rel[i].r_info) & 0xff) {
128		case R_SPARC_64:
129			location[0] = v >> 56;
130			location[1] = v >> 48;
131			location[2] = v >> 40;
132			location[3] = v >> 32;
133			location[4] = v >> 24;
134			location[5] = v >> 16;
135			location[6] = v >>  8;
136			location[7] = v >>  0;
137			break;
138
139		case R_SPARC_32:
140			location[0] = v >> 24;
141			location[1] = v >> 16;
142			location[2] = v >>  8;
143			location[3] = v >>  0;
144			break;
145
146		case R_SPARC_WDISP30:
147			v -= (Elf64_Addr) location;
148			*loc32 = (*loc32 & ~0x3fffffff) |
149				((v >> 2) & 0x3fffffff);
150			break;
151
152		case R_SPARC_WDISP22:
153			v -= (Elf64_Addr) location;
154			*loc32 = (*loc32 & ~0x3fffff) |
155				((v >> 2) & 0x3fffff);
156			break;
157
158		case R_SPARC_WDISP19:
159			v -= (Elf64_Addr) location;
160			*loc32 = (*loc32 & ~0x7ffff) |
161				((v >> 2) & 0x7ffff);
162			break;
163
164		case R_SPARC_LO10:
165			*loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
166			break;
167
168		case R_SPARC_HI22:
169			*loc32 = (*loc32 & ~0x3fffff) |
170				((v >> 10) & 0x3fffff);
171			break;
172
173		case R_SPARC_OLO10:
174			*loc32 = (*loc32 & ~0x1fff) |
175				(((v & 0x3ff) +
176				  (ELF64_R_TYPE(rel[i].r_info) >> 8))
177				 & 0x1fff);
178			break;
179
180		default:
181			printk(KERN_ERR "module %s: Unknown relocation: %x\n",
182			       me->name,
183			       (int) (ELF64_R_TYPE(rel[i].r_info) & 0xff));
184			return -ENOEXEC;
185		};
186	}
187	return 0;
188}
189
190int module_finalize(const Elf_Ehdr *hdr,
191		    const Elf_Shdr *sechdrs,
192		    struct module *me)
193{
194	/* Cheetah's I-cache is fully coherent.  */
195	if (tlb_type == spitfire) {
196		unsigned long va;
197
198		flushw_all();
199		for (va =  0; va < (PAGE_SIZE << 1); va += 32)
200			spitfire_put_icache_tag(va, 0x0);
201		__asm__ __volatile__("flush %g6");
202	}
203
204	return 0;
205}
206
207void module_arch_cleanup(struct module *mod)
208{
209}