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