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Linux/arch/nios2/kernel/module.c

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  1 /*
  2  * Kernel module support for Nios II.
  3  *
  4  * Copyright (C) 2004 Microtronix Datacom Ltd.
  5  *   Written by Wentao Xu <xuwentao@microtronix.com>
  6  * Copyright (C) 2001, 2003 Rusty Russell
  7  *
  8  * This file is subject to the terms and conditions of the GNU General
  9  * Public License.  See the file COPYING in the main directory of this
 10  * archive for more details.
 11  */
 12 
 13 #include <linux/moduleloader.h>
 14 #include <linux/elf.h>
 15 #include <linux/mm.h>
 16 #include <linux/vmalloc.h>
 17 #include <linux/slab.h>
 18 #include <linux/fs.h>
 19 #include <linux/string.h>
 20 #include <linux/kernel.h>
 21 
 22 #include <asm/pgtable.h>
 23 #include <asm/cacheflush.h>
 24 
 25 /*
 26  * Modules should NOT be allocated with kmalloc for (obvious) reasons.
 27  * But we do it for now to avoid relocation issues. CALL26/PCREL26 cannot reach
 28  * from 0x80000000 (vmalloc area) to 0xc00000000 (kernel) (kmalloc returns
 29  * addresses in 0xc0000000)
 30  */
 31 void *module_alloc(unsigned long size)
 32 {
 33         if (size == 0)
 34                 return NULL;
 35         return kmalloc(size, GFP_KERNEL);
 36 }
 37 
 38 /* Free memory returned from module_alloc */
 39 void module_memfree(void *module_region)
 40 {
 41         kfree(module_region);
 42 }
 43 
 44 int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
 45                         unsigned int symindex, unsigned int relsec,
 46                         struct module *mod)
 47 {
 48         unsigned int i;
 49         Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
 50 
 51         pr_debug("Applying relocate section %u to %u\n", relsec,
 52                  sechdrs[relsec].sh_info);
 53 
 54         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
 55                 /* This is where to make the change */
 56                 uint32_t word;
 57                 uint32_t *loc
 58                         = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 59                            + rela[i].r_offset);
 60                 /* This is the symbol it is referring to.  Note that all
 61                    undefined symbols have been resolved.  */
 62                 Elf32_Sym *sym
 63                         = ((Elf32_Sym *)sechdrs[symindex].sh_addr
 64                                 + ELF32_R_SYM(rela[i].r_info));
 65                 uint32_t v = sym->st_value + rela[i].r_addend;
 66 
 67                 pr_debug("reltype %d 0x%x name:<%s>\n",
 68                         ELF32_R_TYPE(rela[i].r_info),
 69                         rela[i].r_offset, strtab + sym->st_name);
 70 
 71                 switch (ELF32_R_TYPE(rela[i].r_info)) {
 72                 case R_NIOS2_NONE:
 73                         break;
 74                 case R_NIOS2_BFD_RELOC_32:
 75                         *loc += v;
 76                         break;
 77                 case R_NIOS2_PCREL16:
 78                         v -= (uint32_t)loc + 4;
 79                         if ((int32_t)v > 0x7fff ||
 80                                 (int32_t)v < -(int32_t)0x8000) {
 81                                 pr_err("module %s: relocation overflow\n",
 82                                         mod->name);
 83                                 return -ENOEXEC;
 84                         }
 85                         word = *loc;
 86                         *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
 87                                 (word & 0x3f);
 88                         break;
 89                 case R_NIOS2_CALL26:
 90                         if (v & 3) {
 91                                 pr_err("module %s: dangerous relocation\n",
 92                                         mod->name);
 93                                 return -ENOEXEC;
 94                         }
 95                         if ((v >> 28) != ((uint32_t)loc >> 28)) {
 96                                 pr_err("module %s: relocation overflow\n",
 97                                         mod->name);
 98                                 return -ENOEXEC;
 99                         }
100                         *loc = (*loc & 0x3f) | ((v >> 2) << 6);
101                         break;
102                 case R_NIOS2_HI16:
103                         word = *loc;
104                         *loc = ((((word >> 22) << 16) |
105                                 ((v >> 16) & 0xffff)) << 6) | (word & 0x3f);
106                         break;
107                 case R_NIOS2_LO16:
108                         word = *loc;
109                         *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
110                                         (word & 0x3f);
111                         break;
112                 case R_NIOS2_HIADJ16:
113                         {
114                                 Elf32_Addr word2;
115 
116                                 word = *loc;
117                                 word2 = ((v >> 16) + ((v >> 15) & 1)) & 0xffff;
118                                 *loc = ((((word >> 22) << 16) | word2) << 6) |
119                                                 (word & 0x3f);
120                         }
121                         break;
122 
123                 default:
124                         pr_err("module %s: Unknown reloc: %u\n",
125                                 mod->name, ELF32_R_TYPE(rela[i].r_info));
126                         return -ENOEXEC;
127                 }
128         }
129 
130         return 0;
131 }
132 
133 int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
134                         struct module *me)
135 {
136         flush_cache_all();
137         return 0;
138 }
139 

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