arch/sparc/kernel/module.c

   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/gfp.h>
  13 #include <linux/string.h>
  14 #include <linux/ctype.h>
  15 #include <linux/mm.h>
  16
  17 #include <asm/processor.h>
  18 #include <asm/spitfire.h>
  19
  20 #include "entry.h"
  21
  22 #ifdef CONFIG_SPARC64
  23
  24 #include <linux/jump_label.h>
  25
  26 static void *module_map(unsigned long size)
  27 {
  28         if (PAGE_ALIGN(size) > MODULES_LEN)
  29                 return NULL;
  30         return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
  31                                 GFP_KERNEL, PAGE_KERNEL, -1,
  32                                 __builtin_return_address(0));
  33 }
  34
  35 static char *dot2underscore(char *name)
  36 {
  37         return name;
  38 }
  39 #else
  40 static void *module_map(unsigned long size)
  41 {
  42         return vmalloc(size);
  43 }
  44
  45 /* Replace references to .func with _Func */
  46 static char *dot2underscore(char *name)
  47 {
  48         if (name[0] == '.') {
  49                 name[0] = '_';
  50                 name[1] = toupper(name[1]);
  51         }
  52         return name;
  53 }
  54 #endif /* CONFIG_SPARC64 */
  55
  56 void *module_alloc(unsigned long size)
  57 {
  58         void *ret;
  59
  60         /* We handle the zero case fine, unlike vmalloc */
  61         if (size == 0)
  62                 return NULL;
  63
  64         ret = module_map(size);
  65         if (!ret)
  66                 ret = ERR_PTR(-ENOMEM);
  67         else
  68                 memset(ret, 0, size);
  69
  70         return ret;
  71 }
  72
  73 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
  74 int module_frob_arch_sections(Elf_Ehdr *hdr,
  75                               Elf_Shdr *sechdrs,
  76                               char *secstrings,
  77                               struct module *mod)
  78 {
  79         unsigned int symidx;
  80         Elf_Sym *sym;
  81         char *strtab;
  82         int i;
  83
  84         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
  85                 if (symidx == hdr->e_shnum-1) {
  86                         printk("%s: no symtab found.\n", mod->name);
  87                         return -ENOEXEC;
  88                 }
  89         }
  90         sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
  91         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
  92
  93         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
  94                 if (sym[i].st_shndx == SHN_UNDEF) {
  95                         if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
  96                                 sym[i].st_shndx = SHN_ABS;
  97                         } else {
  98                                 char *name = strtab + sym[i].st_name;
  99                                 dot2underscore(name);
 100                         }
 101                 }
 102         }
 103         return 0;
 104 }
 105
 106 int apply_relocate_add(Elf_Shdr *sechdrs,
 107                        const char *strtab,
 108                        unsigned int symindex,
 109                        unsigned int relsec,
 110                        struct module *me)
 111 {
 112         unsigned int i;
 113         Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 114         Elf_Sym *sym;
 115         u8 *location;
 116         u32 *loc32;
 117
 118         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 119                 Elf_Addr v;
 120
 121                 /* This is where to make the change */
 122                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 123                         + rel[i].r_offset;
 124                 loc32 = (u32 *) location;
 125
 126 #ifdef CONFIG_SPARC64
 127                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
 128 #endif /* CONFIG_SPARC64 */
 129
 130                 /* This is the symbol it is referring to.  Note that all
 131                    undefined symbols have been resolved.  */
 132                 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 133                         + ELF_R_SYM(rel[i].r_info);
 134                 v = sym->st_value + rel[i].r_addend;
 135
 136                 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
 137 #ifdef CONFIG_SPARC64
 138                 case R_SPARC_64:
 139                         location[0] = v >> 56;
 140                         location[1] = v >> 48;
 141                         location[2] = v >> 40;
 142                         location[3] = v >> 32;
 143                         location[4] = v >> 24;
 144                         location[5] = v >> 16;
 145                         location[6] = v >>  8;
 146                         location[7] = v >>  0;
 147                         break;
 148
 149                 case R_SPARC_DISP32:
 150                         v -= (Elf_Addr) location;
 151                         *loc32 = v;
 152                         break;
 153
 154                 case R_SPARC_WDISP19:
 155                         v -= (Elf_Addr) location;
 156                         *loc32 = (*loc32 & ~0x7ffff) |
 157                                 ((v >> 2) & 0x7ffff);
 158                         break;
 159
 160                 case R_SPARC_OLO10:
 161                         *loc32 = (*loc32 & ~0x1fff) |
 162                                 (((v & 0x3ff) +
 163                                   (ELF_R_TYPE(rel[i].r_info) >> 8))
 164                                  & 0x1fff);
 165                         break;
 166 #endif /* CONFIG_SPARC64 */
 167
 168                 case R_SPARC_32:
 169                 case R_SPARC_UA32:
 170                         location[0] = v >> 24;
 171                         location[1] = v >> 16;
 172                         location[2] = v >>  8;
 173                         location[3] = v >>  0;
 174                         break;
 175
 176                 case R_SPARC_WDISP30:
 177                         v -= (Elf_Addr) location;
 178                         *loc32 = (*loc32 & ~0x3fffffff) |
 179                                 ((v >> 2) & 0x3fffffff);
 180                         break;
 181
 182                 case R_SPARC_WDISP22:
 183                         v -= (Elf_Addr) location;
 184                         *loc32 = (*loc32 & ~0x3fffff) |
 185                                 ((v >> 2) & 0x3fffff);
 186                         break;
 187
 188                 case R_SPARC_LO10:
 189                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 190                         break;
 191
 192                 case R_SPARC_HI22:
 193                         *loc32 = (*loc32 & ~0x3fffff) |
 194                                 ((v >> 10) & 0x3fffff);
 195                         break;
 196
 197                 default:
 198                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 199                                me->name,
 200                                (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
 201                         return -ENOEXEC;
 202                 }
 203         }
 204         return 0;
 205 }
 206
 207 #ifdef CONFIG_SPARC64
 208 static void do_patch_sections(const Elf_Ehdr *hdr,
 209                               const Elf_Shdr *sechdrs)
 210 {
 211         const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL;
 212         char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
 213
 214         for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
 215                 if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name))
 216                         sun4v_1insn = s;
 217                 if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name))
 218                         sun4v_2insn = s;
 219         }
 220
 221         if (sun4v_1insn && tlb_type == hypervisor) {
 222                 void *p = (void *) sun4v_1insn->sh_addr;
 223                 sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size);
 224         }
 225         if (sun4v_2insn && tlb_type == hypervisor) {
 226                 void *p = (void *) sun4v_2insn->sh_addr;
 227                 sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size);
 228         }
 229 }
 230
 231 int module_finalize(const Elf_Ehdr *hdr,
 232                     const Elf_Shdr *sechdrs,
 233                     struct module *me)
 234 {
 235         /* make jump label nops */
 236         jump_label_apply_nops(me);
 237
 238         do_patch_sections(hdr, sechdrs);
 239
 240         /* Cheetah's I-cache is fully coherent.  */
 241         if (tlb_type == spitfire) {
 242                 unsigned long va;
 243
 244                 flushw_all();
 245                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 246                         spitfire_put_icache_tag(va, 0x0);
 247                 __asm__ __volatile__("flush %g6");
 248         }
 249
 250         return 0;
 251 }
 252 #endif /* CONFIG_SPARC64 */