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authorMichal Simek <monstr@monstr.eu>2009-03-27 09:25:17 -0400
committerMichal Simek <monstr@monstr.eu>2009-03-27 09:25:17 -0400
commitf6b165c6ae540c607a9a62427f1b25bc5743c0aa (patch)
treedff477a1fb22c944b191947fec6e51c6f3f629a7 /arch
parent7fbd3232082908e2a50c6776f4779b79085161fa (diff)
microblaze_v8: kernel modules support
Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: John Linn <john.linn@xilinx.com> Acked-by: John Williams <john.williams@petalogix.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch')
-rw-r--r--arch/microblaze/include/asm/module.h37
-rw-r--r--arch/microblaze/kernel/microblaze_ksyms.c47
-rw-r--r--arch/microblaze/kernel/module.c151
3 files changed, 235 insertions, 0 deletions
diff --git a/arch/microblaze/include/asm/module.h b/arch/microblaze/include/asm/module.h
new file mode 100644
index 000000000000..914565a90315
--- /dev/null
+++ b/arch/microblaze/include/asm/module.h
@@ -0,0 +1,37 @@
1/*
2 * Copyright (C) 2006 Atmark Techno, Inc.
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 */
8
9#ifndef _ASM_MICROBLAZE_MODULE_H
10#define _ASM_MICROBLAZE_MODULE_H
11
12/* Microblaze Relocations */
13#define R_MICROBLAZE_NONE 0
14#define R_MICROBLAZE_32 1
15#define R_MICROBLAZE_32_PCREL 2
16#define R_MICROBLAZE_64_PCREL 3
17#define R_MICROBLAZE_32_PCREL_LO 4
18#define R_MICROBLAZE_64 5
19#define R_MICROBLAZE_32_LO 6
20#define R_MICROBLAZE_SRO32 7
21#define R_MICROBLAZE_SRW32 8
22#define R_MICROBLAZE_64_NONE 9
23#define R_MICROBLAZE_32_SYM_OP_SYM 10
24/* Keep this the last entry. */
25#define R_MICROBLAZE_NUM 11
26
27struct mod_arch_specific {
28 int foo;
29};
30
31#define Elf_Shdr Elf32_Shdr
32#define Elf_Sym Elf32_Sym
33#define Elf_Ehdr Elf32_Ehdr
34
35typedef struct { volatile int counter; } module_t;
36
37#endif /* _ASM_MICROBLAZE_MODULE_H */
diff --git a/arch/microblaze/kernel/microblaze_ksyms.c b/arch/microblaze/kernel/microblaze_ksyms.c
new file mode 100644
index 000000000000..5f71790e3c3c
--- /dev/null
+++ b/arch/microblaze/kernel/microblaze_ksyms.c
@@ -0,0 +1,47 @@
1/*
2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2008-2009 PetaLogix
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/module.h>
11#include <linux/string.h>
12#include <linux/cryptohash.h>
13#include <linux/delay.h>
14#include <linux/in6.h>
15#include <linux/syscalls.h>
16
17#include <asm/checksum.h>
18#include <linux/io.h>
19#include <asm/page.h>
20#include <asm/system.h>
21#include <linux/uaccess.h>
22
23/*
24 * libgcc functions - functions that are used internally by the
25 * compiler... (prototypes are not correct though, but that
26 * doesn't really matter since they're not versioned).
27 */
28extern void __ashldi3(void);
29EXPORT_SYMBOL(__ashldi3);
30extern void __ashrdi3(void);
31EXPORT_SYMBOL(__ashrdi3);
32extern void __divsi3(void);
33EXPORT_SYMBOL(__divsi3);
34extern void __lshrdi3(void);
35EXPORT_SYMBOL(__lshrdi3);
36extern void __modsi3(void);
37EXPORT_SYMBOL(__modsi3);
38extern void __mulsi3(void);
39EXPORT_SYMBOL(__mulsi3);
40extern void __muldi3(void);
41EXPORT_SYMBOL(__muldi3);
42extern void __ucmpdi2(void);
43EXPORT_SYMBOL(__ucmpdi2);
44extern void __udivsi3(void);
45EXPORT_SYMBOL(__udivsi3);
46extern void __umodsi3(void);
47EXPORT_SYMBOL(__umodsi3);
diff --git a/arch/microblaze/kernel/module.c b/arch/microblaze/kernel/module.c
new file mode 100644
index 000000000000..51414171326f
--- /dev/null
+++ b/arch/microblaze/kernel/module.c
@@ -0,0 +1,151 @@
1/*
2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2007-2009 PetaLogix
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/module.h>
11#include <linux/moduleloader.h>
12#include <linux/kernel.h>
13#include <linux/elf.h>
14#include <linux/vmalloc.h>
15#include <linux/slab.h>
16#include <linux/fs.h>
17#include <linux/string.h>
18
19#include <asm/pgtable.h>
20
21void *module_alloc(unsigned long size)
22{
23 void *ret;
24 ret = (size == 0) ? NULL : vmalloc(size);
25 pr_debug("module_alloc (%08lx@%08lx)\n", size, (unsigned long int)ret);
26 return ret;
27}
28
29void module_free(struct module *module, void *region)
30{
31 pr_debug("module_free(%s,%08lx)\n", module->name,
32 (unsigned long)region);
33 vfree(region);
34}
35
36int module_frob_arch_sections(Elf_Ehdr *hdr,
37 Elf_Shdr *sechdrs,
38 char *secstrings,
39 struct module *mod)
40{
41 return 0;
42}
43
44int apply_relocate(Elf32_Shdr *sechdrs, const char *strtab,
45 unsigned int symindex, unsigned int relsec, struct module *module)
46{
47 printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
48 module->name);
49 return -ENOEXEC;
50}
51
52int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
53 unsigned int symindex, unsigned int relsec, struct module *module)
54{
55
56 unsigned int i;
57 Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
58 Elf32_Sym *sym;
59 unsigned long int *location;
60 unsigned long int locoffs;
61 unsigned long int value;
62#if __GNUC__ < 4
63 unsigned long int old_value;
64#endif
65
66 pr_debug("Applying add relocation section %u to %u\n",
67 relsec, sechdrs[relsec].sh_info);
68
69 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
70
71 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
72 rela[i].r_offset;
73 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
74 ELF32_R_SYM(rela[i].r_info);
75 value = sym->st_value + rela[i].r_addend;
76
77 switch (ELF32_R_TYPE(rela[i].r_info)) {
78
79 /*
80 * Be careful! mb-gcc / mb-ld splits the relocs between the
81 * text and the reloc table. In general this means we must
82 * read the current contents of (*location), add any offset
83 * then store the result back in
84 */
85
86 case R_MICROBLAZE_32:
87#if __GNUC__ < 4
88 old_value = *location;
89 *location = value + old_value;
90
91 pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
92 old_value, value);
93#else
94 *location = value;
95#endif
96 break;
97
98 case R_MICROBLAZE_64:
99#if __GNUC__ < 4
100 /* Split relocs only required/used pre gcc4.1.1 */
101 old_value = ((location[0] & 0x0000FFFF) << 16) |
102 (location[1] & 0x0000FFFF);
103 value += old_value;
104#endif
105 location[0] = (location[0] & 0xFFFF0000) |
106 (value >> 16);
107 location[1] = (location[1] & 0xFFFF0000) |
108 (value & 0xFFFF);
109#if __GNUC__ < 4
110 pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
111 old_value, value);
112#endif
113 break;
114
115 case R_MICROBLAZE_64_PCREL:
116 locoffs = (location[0] & 0xFFFF) << 16 |
117 (location[1] & 0xFFFF);
118 value -= (unsigned long int)(location) + 4 +
119 locoffs;
120 location[0] = (location[0] & 0xFFFF0000) |
121 (value >> 16);
122 location[1] = (location[1] & 0xFFFF0000) |
123 (value & 0xFFFF);
124 pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
125 value);
126 break;
127
128 case R_MICROBLAZE_NONE:
129 pr_debug("R_MICROBLAZE_NONE\n");
130 break;
131
132 default:
133 printk(KERN_ERR "module %s: "
134 "Unknown relocation: %u\n",
135 module->name,
136 ELF32_R_TYPE(rela->r_info));
137 return -ENOEXEC;
138 }
139 }
140 return 0;
141}
142
143int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
144 struct module *module)
145{
146 return 0;
147}
148
149void module_arch_cleanup(struct module *mod)
150{
151}
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