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