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 /* Free memory returned from module_core_alloc/module_init_alloc */
  74 void module_free(struct module *mod, void *module_region)
  75 {
  76         vfree(module_region);
  77 }
  78
  79 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
  80 int module_frob_arch_sections(Elf_Ehdr *hdr,
  81                               Elf_Shdr *sechdrs,
  82                               char *secstrings,
  83                               struct module *mod)
  84 {
  85         unsigned int symidx;
  86         Elf_Sym *sym;
  87         char *strtab;
  88         int i;
  89
  90         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
  91                 if (symidx == hdr->e_shnum-1) {
  92                         printk("%s: no symtab found.\n", mod->name);
  93                         return -ENOEXEC;
  94                 }
  95         }
  96         sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
  97         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
  98
  99         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
 100                 if (sym[i].st_shndx == SHN_UNDEF) {
 101                         if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
 102                                 sym[i].st_shndx = SHN_ABS;
 103                         } else {
 104                                 char *name = strtab + sym[i].st_name;
 105                                 dot2underscore(name);
 106                         }
 107                 }
 108         }
 109         return 0;
 110 }
 111
 112 int apply_relocate(Elf_Shdr *sechdrs,
 113                    const char *strtab,
 114                    unsigned int symindex,
 115                    unsigned int relsec,
 116                    struct module *me)
 117 {
 118         printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
 119                me->name);
 120         return -ENOEXEC;
 121 }
 122
 123 int apply_relocate_add(Elf_Shdr *sechdrs,
 124                        const char *strtab,
 125                        unsigned int symindex,
 126                        unsigned int relsec,
 127                        struct module *me)
 128 {
 129         unsigned int i;
 130         Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 131         Elf_Sym *sym;
 132         u8 *location;
 133         u32 *loc32;
 134
 135         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 136                 Elf_Addr v;
 137
 138                 /* This is where to make the change */
 139                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 140                         + rel[i].r_offset;
 141                 loc32 = (u32 *) location;
 142
 143 #ifdef CONFIG_SPARC64
 144                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
 145 #endif /* CONFIG_SPARC64 */
 146
 147                 /* This is the symbol it is referring to.  Note that all
 148                    undefined symbols have been resolved.  */
 149                 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 150                         + ELF_R_SYM(rel[i].r_info);
 151                 v = sym->st_value + rel[i].r_addend;
 152
 153                 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
 154 #ifdef CONFIG_SPARC64
 155                 case R_SPARC_64:
 156                         location[0] = v >> 56;
 157                         location[1] = v >> 48;
 158                         location[2] = v >> 40;
 159                         location[3] = v >> 32;
 160                         location[4] = v >> 24;
 161                         location[5] = v >> 16;
 162                         location[6] = v >>  8;
 163                         location[7] = v >>  0;
 164                         break;
 165
 166                 case R_SPARC_DISP32:
 167                         v -= (Elf_Addr) location;
 168                         *loc32 = v;
 169                         break;
 170
 171                 case R_SPARC_WDISP19:
 172                         v -= (Elf_Addr) location;
 173                         *loc32 = (*loc32 & ~0x7ffff) |
 174                                 ((v >> 2) & 0x7ffff);
 175                         break;
 176
 177                 case R_SPARC_OLO10:
 178                         *loc32 = (*loc32 & ~0x1fff) |
 179                                 (((v & 0x3ff) +
 180                                   (ELF_R_TYPE(rel[i].r_info) >> 8))
 181                                  & 0x1fff);
 182                         break;
 183 #endif /* CONFIG_SPARC64 */
 184
 185                 case R_SPARC_32:
 186                 case R_SPARC_UA32:
 187                         location[0] = v >> 24;
 188                         location[1] = v >> 16;
 189                         location[2] = v >>  8;
 190                         location[3] = v >>  0;
 191                         break;
 192
 193                 case R_SPARC_WDISP30:
 194                         v -= (Elf_Addr) location;
 195                         *loc32 = (*loc32 & ~0x3fffffff) |
 196                                 ((v >> 2) & 0x3fffffff);
 197                         break;
 198
 199                 case R_SPARC_WDISP22:
 200                         v -= (Elf_Addr) location;
 201                         *loc32 = (*loc32 & ~0x3fffff) |
 202                                 ((v >> 2) & 0x3fffff);
 203                         break;
 204
 205                 case R_SPARC_LO10:
 206                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 207                         break;
 208
 209                 case R_SPARC_HI22:
 210                         *loc32 = (*loc32 & ~0x3fffff) |
 211                                 ((v >> 10) & 0x3fffff);
 212                         break;
 213
 214                 default:
 215                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 216                                me->name,
 217                                (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
 218                         return -ENOEXEC;
 219                 }
 220         }
 221         return 0;
 222 }
 223
 224 #ifdef CONFIG_SPARC64
 225 static void do_patch_sections(const Elf_Ehdr *hdr,
 226                               const Elf_Shdr *sechdrs)
 227 {
 228         const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL;
 229         char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
 230
 231         for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
 232                 if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name))
 233                         sun4v_1insn = s;
 234                 if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name))
 235                         sun4v_2insn = s;
 236         }
 237
 238         if (sun4v_1insn && tlb_type == hypervisor) {
 239                 void *p = (void *) sun4v_1insn->sh_addr;
 240                 sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size);
 241         }
 242         if (sun4v_2insn && tlb_type == hypervisor) {
 243                 void *p = (void *) sun4v_2insn->sh_addr;
 244                 sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size);
 245         }
 246 }
 247
 248 int module_finalize(const Elf_Ehdr *hdr,
 249                     const Elf_Shdr *sechdrs,
 250                     struct module *me)
 251 {
 252         /* make jump label nops */
 253         jump_label_apply_nops(me);
 254
 255         do_patch_sections(hdr, sechdrs);
 256
 257         /* Cheetah's I-cache is fully coherent.  */
 258         if (tlb_type == spitfire) {
 259                 unsigned long va;
 260
 261                 flushw_all();
 262                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 263                         spitfire_put_icache_tag(va, 0x0);
 264                 __asm__ __volatile__("flush %g6");
 265         }
 266
 267         return 0;
 268 }
 269 #else
 270 int module_finalize(const Elf_Ehdr *hdr,
 271                     const Elf_Shdr *sechdrs,
 272                     struct module *me)
 273 {
 274         return 0;
 275 }
 276 #endif /* CONFIG_SPARC64 */
 277
 278 void module_arch_cleanup(struct module *mod)
 279 {
 280 }