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