arch/nds32/kernel/module.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2005-2017 Andes Technology Corporation
   3
   4 #include <linux/module.h>
   5 #include <linux/elf.h>
   6 #include <linux/vmalloc.h>
   7 #include <linux/moduleloader.h>
   8 #include <asm/pgtable.h>
   9
  10 void *module_alloc(unsigned long size)
  11 {
  12         return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
  13                                     GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE,
  14                                     __builtin_return_address(0));
  15 }
  16
  17 void module_free(struct module *module, void *region)
  18 {
  19         vfree(region);
  20 }
  21
  22 int module_frob_arch_sections(Elf_Ehdr * hdr,
  23                               Elf_Shdr * sechdrs,
  24                               char *secstrings, struct module *mod)
  25 {
  26         return 0;
  27 }
  28
  29 void do_reloc16(unsigned int val, unsigned int *loc, unsigned int val_mask,
  30                 unsigned int val_shift, unsigned int loc_mask,
  31                 unsigned int partial_in_place, unsigned int swap)
  32 {
  33         unsigned int tmp = 0, tmp2 = 0;
  34
  35         __asm__ __volatile__("\tlhi.bi\t%0, [%2], 0\n"
  36                              "\tbeqz\t%3, 1f\n"
  37                              "\twsbh\t%0, %1\n"
  38                              "1:\n":"=r"(tmp):"0"(tmp), "r"(loc), "r"(swap)
  39             );
  40
  41         tmp2 = tmp & loc_mask;
  42         if (partial_in_place) {
  43                 tmp &= (~loc_mask);
  44                 tmp =
  45                     tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask);
  46         } else {
  47                 tmp = tmp2 | ((val & val_mask) >> val_shift);
  48         }
  49
  50         __asm__ __volatile__("\tbeqz\t%3, 2f\n"
  51                              "\twsbh\t%0, %1\n"
  52                              "2:\n"
  53                              "\tshi.bi\t%0, [%2], 0\n":"=r"(tmp):"0"(tmp),
  54                              "r"(loc), "r"(swap)
  55             );
  56 }
  57
  58 void do_reloc32(unsigned int val, unsigned int *loc, unsigned int val_mask,
  59                 unsigned int val_shift, unsigned int loc_mask,
  60                 unsigned int partial_in_place, unsigned int swap)
  61 {
  62         unsigned int tmp = 0, tmp2 = 0;
  63
  64         __asm__ __volatile__("\tlmw.bi\t%0, [%2], %0, 0\n"
  65                              "\tbeqz\t%3, 1f\n"
  66                              "\twsbh\t%0, %1\n"
  67                              "\trotri\t%0, %1, 16\n"
  68                              "1:\n":"=r"(tmp):"0"(tmp), "r"(loc), "r"(swap)
  69             );
  70
  71         tmp2 = tmp & loc_mask;
  72         if (partial_in_place) {
  73                 tmp &= (~loc_mask);
  74                 tmp =
  75                     tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask);
  76         } else {
  77                 tmp = tmp2 | ((val & val_mask) >> val_shift);
  78         }
  79
  80         __asm__ __volatile__("\tbeqz\t%3, 2f\n"
  81                              "\twsbh\t%0, %1\n"
  82                              "\trotri\t%0, %1, 16\n"
  83                              "2:\n"
  84                              "\tsmw.bi\t%0, [%2], %0, 0\n":"=r"(tmp):"0"(tmp),
  85                              "r"(loc), "r"(swap)
  86             );
  87 }
  88
  89 static inline int exceed_limit(int offset, unsigned int val_mask,
  90                                struct module *module, Elf32_Rela * rel,
  91                                unsigned int relindex, unsigned int reloc_order)
  92 {
  93         int abs_off = offset < 0 ? ~offset : offset;
  94
  95         if (abs_off & (~val_mask)) {
  96                 pr_err("\n%s: relocation type %d out of range.\n"
  97                        "please rebuild the kernel module with gcc option \"-Wa,-mno-small-text\".\n",
  98                        module->name, ELF32_R_TYPE(rel->r_info));
  99                 pr_err("section %d reloc %d offset 0x%x relative 0x%x.\n",
 100                        relindex, reloc_order, rel->r_offset, offset);
 101                 return true;
 102         }
 103         return false;
 104 }
 105
 106 #ifdef __NDS32_EL__
 107 #define NEED_SWAP 1
 108 #else
 109 #define NEED_SWAP 0
 110 #endif
 111
 112 int
 113 apply_relocate_add(Elf32_Shdr * sechdrs, const char *strtab,
 114                    unsigned int symindex, unsigned int relindex,
 115                    struct module *module)
 116 {
 117         Elf32_Shdr *symsec = sechdrs + symindex;
 118         Elf32_Shdr *relsec = sechdrs + relindex;
 119         Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
 120         Elf32_Rela *rel = (void *)relsec->sh_addr;
 121         unsigned int i;
 122
 123         for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rela); i++, rel++) {
 124                 Elf32_Addr *loc;
 125                 Elf32_Sym *sym;
 126                 Elf32_Addr v;
 127                 s32 offset;
 128
 129                 offset = ELF32_R_SYM(rel->r_info);
 130                 if (offset < 0
 131                     || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
 132                         pr_err("%s: bad relocation\n", module->name);
 133                         pr_err("section %d reloc %d\n", relindex, i);
 134                         return -ENOEXEC;
 135                 }
 136
 137                 sym = ((Elf32_Sym *) symsec->sh_addr) + offset;
 138
 139                 if (rel->r_offset < 0
 140                     || rel->r_offset > dstsec->sh_size - sizeof(u16)) {
 141                         pr_err("%s: out of bounds relocation\n", module->name);
 142                         pr_err("section %d reloc %d offset 0x%0x size %d\n",
 143                                relindex, i, rel->r_offset, dstsec->sh_size);
 144                         return -ENOEXEC;
 145                 }
 146
 147                 loc = (Elf32_Addr *) (dstsec->sh_addr + rel->r_offset);
 148                 v = sym->st_value + rel->r_addend;
 149
 150                 switch (ELF32_R_TYPE(rel->r_info)) {
 151                 case R_NDS32_NONE:
 152                 case R_NDS32_INSN16:
 153                 case R_NDS32_LABEL:
 154                 case R_NDS32_LONGCALL1:
 155                 case R_NDS32_LONGCALL2:
 156                 case R_NDS32_LONGCALL3:
 157                 case R_NDS32_LONGCALL4:
 158                 case R_NDS32_LONGJUMP1:
 159                 case R_NDS32_LONGJUMP2:
 160                 case R_NDS32_LONGJUMP3:
 161                 case R_NDS32_9_FIXED_RELA:
 162                 case R_NDS32_15_FIXED_RELA:
 163                 case R_NDS32_17_FIXED_RELA:
 164                 case R_NDS32_25_FIXED_RELA:
 165                 case R_NDS32_LOADSTORE:
 166                 case R_NDS32_DWARF2_OP1_RELA:
 167                 case R_NDS32_DWARF2_OP2_RELA:
 168                 case R_NDS32_DWARF2_LEB_RELA:
 169                 case R_NDS32_RELA_NOP_MIX ... R_NDS32_RELA_NOP_MAX:
 170                         break;
 171
 172                 case R_NDS32_32_RELA:
 173                         do_reloc32(v, loc, 0xffffffff, 0, 0, 0, 0);
 174                         break;
 175
 176                 case R_NDS32_HI20_RELA:
 177                         do_reloc32(v, loc, 0xfffff000, 12, 0xfff00000, 0,
 178                                    NEED_SWAP);
 179                         break;
 180
 181                 case R_NDS32_LO12S3_RELA:
 182                         do_reloc32(v, loc, 0x00000fff, 3, 0xfffff000, 0,
 183                                    NEED_SWAP);
 184                         break;
 185
 186                 case R_NDS32_LO12S2_RELA:
 187                         do_reloc32(v, loc, 0x00000fff, 2, 0xfffff000, 0,
 188                                    NEED_SWAP);
 189                         break;
 190
 191                 case R_NDS32_LO12S1_RELA:
 192                         do_reloc32(v, loc, 0x00000fff, 1, 0xfffff000, 0,
 193                                    NEED_SWAP);
 194                         break;
 195
 196                 case R_NDS32_LO12S0_RELA:
 197                 case R_NDS32_LO12S0_ORI_RELA:
 198                         do_reloc32(v, loc, 0x00000fff, 0, 0xfffff000, 0,
 199                                    NEED_SWAP);
 200                         break;
 201
 202                 case R_NDS32_9_PCREL_RELA:
 203                         if (exceed_limit
 204                             ((v - (Elf32_Addr) loc), 0x000000ff, module, rel,
 205                              relindex, i))
 206                                 return -ENOEXEC;
 207                         do_reloc16(v - (Elf32_Addr) loc, loc, 0x000001ff, 1,
 208                                    0xffffff00, 0, NEED_SWAP);
 209                         break;
 210
 211                 case R_NDS32_15_PCREL_RELA:
 212                         if (exceed_limit
 213                             ((v - (Elf32_Addr) loc), 0x00003fff, module, rel,
 214                              relindex, i))
 215                                 return -ENOEXEC;
 216                         do_reloc32(v - (Elf32_Addr) loc, loc, 0x00007fff, 1,
 217                                    0xffffc000, 0, NEED_SWAP);
 218                         break;
 219
 220                 case R_NDS32_17_PCREL_RELA:
 221                         if (exceed_limit
 222                             ((v - (Elf32_Addr) loc), 0x0000ffff, module, rel,
 223                              relindex, i))
 224                                 return -ENOEXEC;
 225                         do_reloc32(v - (Elf32_Addr) loc, loc, 0x0001ffff, 1,
 226                                    0xffff0000, 0, NEED_SWAP);
 227                         break;
 228
 229                 case R_NDS32_25_PCREL_RELA:
 230                         if (exceed_limit
 231                             ((v - (Elf32_Addr) loc), 0x00ffffff, module, rel,
 232                              relindex, i))
 233                                 return -ENOEXEC;
 234                         do_reloc32(v - (Elf32_Addr) loc, loc, 0x01ffffff, 1,
 235                                    0xff000000, 0, NEED_SWAP);
 236                         break;
 237                 case R_NDS32_WORD_9_PCREL_RELA:
 238                         if (exceed_limit
 239                             ((v - (Elf32_Addr) loc), 0x000000ff, module, rel,
 240                              relindex, i))
 241                                 return -ENOEXEC;
 242                         do_reloc32(v - (Elf32_Addr) loc, loc, 0x000001ff, 1,
 243                                    0xffffff00, 0, NEED_SWAP);
 244                         break;
 245
 246                 case R_NDS32_SDA15S3_RELA:
 247                 case R_NDS32_SDA15S2_RELA:
 248                 case R_NDS32_SDA15S1_RELA:
 249                 case R_NDS32_SDA15S0_RELA:
 250                         pr_err("%s: unsupported relocation type %d.\n",
 251                                module->name, ELF32_R_TYPE(rel->r_info));
 252                         pr_err
 253                             ("Small data section access doesn't work in the kernel space; "
 254                              "please rebuild the kernel module with gcc option -mcmodel=large.\n");
 255                         pr_err("section %d reloc %d offset 0x%x size %d\n",
 256                                relindex, i, rel->r_offset, dstsec->sh_size);
 257                         break;
 258
 259                 default:
 260                         pr_err("%s: unsupported relocation type %d.\n",
 261                                module->name, ELF32_R_TYPE(rel->r_info));
 262                         pr_err("section %d reloc %d offset 0x%x size %d\n",
 263                                relindex, i, rel->r_offset, dstsec->sh_size);
 264                 }
 265         }
 266         return 0;
 267 }
 268
 269 int
 270 module_finalize(const Elf32_Ehdr * hdr, const Elf_Shdr * sechdrs,
 271                 struct module *module)
 272 {
 273         return 0;
 274 }
 275
 276 void module_arch_cleanup(struct module *mod)
 277 {
 278 }