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