1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file COPYING in the main directory of this archive
4 * for more details.
5 */
6
7#include <linux/moduleloader.h>
8#include <linux/elf.h>
9#include <linux/vmalloc.h>
10#include <linux/fs.h>
11#include <linux/string.h>
12#include <linux/kernel.h>
13
14#if 0
15#define DEBUGP(fmt, ...) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
16#else
17#define DEBUGP(fmt, ...) no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
18#endif
19
20#ifdef CONFIG_MODULES
21
22int apply_relocate(Elf32_Shdr *sechdrs,
23		   const char *strtab,
24		   unsigned int symindex,
25		   unsigned int relsec,
26		   struct module *me)
27{
28	unsigned int i;
29	Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
30	Elf32_Sym *sym;
31	uint32_t *location;
32
33	DEBUGP("Applying relocate section %u to %u\n", relsec,
34	       sechdrs[relsec].sh_info);
35	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
36		/* This is where to make the change */
37		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
38			+ rel[i].r_offset;
39		/* This is the symbol it is referring to.  Note that all
40		   undefined symbols have been resolved.  */
41		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
42			+ ELF32_R_SYM(rel[i].r_info);
43
44		switch (ELF32_R_TYPE(rel[i].r_info)) {
45		case R_68K_32:
46			/* We add the value into the location given */
47			*location += sym->st_value;
48			break;
49		case R_68K_PC32:
50			/* Add the value, subtract its position */
51			*location += sym->st_value - (uint32_t)location;
52			break;
53		default:
54			pr_err("module %s: Unknown relocation: %u\n", me->name,
55			       ELF32_R_TYPE(rel[i].r_info));
56			return -ENOEXEC;
57		}
58	}
59	return 0;
60}
61
62int apply_relocate_add(Elf32_Shdr *sechdrs,
63		       const char *strtab,
64		       unsigned int symindex,
65		       unsigned int relsec,
66		       struct module *me)
67{
68	unsigned int i;
69	Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
70	Elf32_Sym *sym;
71	uint32_t *location;
72
73	DEBUGP("Applying relocate_add section %u to %u\n", relsec,
74	       sechdrs[relsec].sh_info);
75	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
76		/* This is where to make the change */
77		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
78			+ rel[i].r_offset;
79		/* This is the symbol it is referring to.  Note that all
80		   undefined symbols have been resolved.  */
81		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
82			+ ELF32_R_SYM(rel[i].r_info);
83
84		switch (ELF32_R_TYPE(rel[i].r_info)) {
85		case R_68K_32:
86			/* We add the value into the location given */
87			*location = rel[i].r_addend + sym->st_value;
88			break;
89		case R_68K_PC32:
90			/* Add the value, subtract its position */
91			*location = rel[i].r_addend + sym->st_value - (uint32_t)location;
92			break;
93		default:
94			pr_err("module %s: Unknown relocation: %u\n", me->name,
95			       ELF32_R_TYPE(rel[i].r_info));
96			return -ENOEXEC;
97		}
98	}
99	return 0;
100}
101
102int module_finalize(const Elf_Ehdr *hdr,
103		    const Elf_Shdr *sechdrs,
104		    struct module *mod)
105{
106	module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end);
107	return 0;
108}
109
110#endif /* CONFIG_MODULES */
111
112void module_fixup(struct module *mod, struct m68k_fixup_info *start,
113		  struct m68k_fixup_info *end)
114{
115#ifdef CONFIG_MMU
116	struct m68k_fixup_info *fixup;
117
118	for (fixup = start; fixup < end; fixup++) {
119		switch (fixup->type) {
120		case m68k_fixup_memoffset:
121			*(u32 *)fixup->addr = m68k_memoffset;
122			break;
123		case m68k_fixup_vnode_shift:
124			*(u16 *)fixup->addr += m68k_virt_to_node_shift;
125			break;
126		}
127	}
128#endif
129}
130