arm64-link.c

   1 #include "tcc.h"
   2 #define HAVE_SECTION_RELOC
   3
   4 ST_DATA struct reloc_info relocs_info[] = {
   5     INIT_RELOC_INFO (R_AARCH64_ABS32, 0, NO_GOTPLT_ENTRY, 0)
   6     INIT_RELOC_INFO (R_AARCH64_ABS64, 0, NO_GOTPLT_ENTRY, 0)
   7     INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G0_NC, 0, NO_GOTPLT_ENTRY, 0)
   8     INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G1_NC, 0, NO_GOTPLT_ENTRY, 0)
   9     INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G2_NC, 0, NO_GOTPLT_ENTRY, 0)
  10     INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G3, 0, NO_GOTPLT_ENTRY, 0)
  11     INIT_RELOC_INFO (R_AARCH64_ADR_PREL_PG_HI21, 0, NO_GOTPLT_ENTRY, 0)
  12     INIT_RELOC_INFO (R_AARCH64_ADD_ABS_LO12_NC, 0, NO_GOTPLT_ENTRY, 0)
  13     INIT_RELOC_INFO (R_AARCH64_JUMP26, 1, AUTO_GOTPLT_ENTRY, 1)
  14     INIT_RELOC_INFO (R_AARCH64_CALL26, 1, AUTO_GOTPLT_ENTRY, 1)
  15     INIT_RELOC_INFO (R_AARCH64_ADR_GOT_PAGE, 0, ALWAYS_GOTPLT_ENTRY, 0)
  16     INIT_RELOC_INFO (R_AARCH64_LD64_GOT_LO12_NC, 0, ALWAYS_GOTPLT_ENTRY, 0)
  17     INIT_RELOC_INFO (R_AARCH64_GLOB_DAT, 0, NO_GOTPLT_ENTRY, 0)
  18     INIT_RELOC_INFO (R_AARCH64_JUMP_SLOT, 1, NO_GOTPLT_ENTRY, 0)
  19 };
  20
  21 void relocate_init(Section *sr) {}
  22
  23 void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
  24 {
  25     ElfW(Sym) *sym;
  26     int sym_index;
  27
  28     sym_index = ELFW(R_SYM)(rel->r_info);
  29     sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
  30
  31     switch(type) {
  32         case R_AARCH64_ABS64:
  33             write64le(ptr, val);
  34             return;
  35         case R_AARCH64_ABS32:
  36             write32le(ptr, val);
  37             return;
  38         case R_AARCH64_MOVW_UABS_G0_NC:
  39             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
  40                             (val & 0xffff) << 5));
  41             return;
  42         case R_AARCH64_MOVW_UABS_G1_NC:
  43             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
  44                             (val >> 16 & 0xffff) << 5));
  45             return;
  46         case R_AARCH64_MOVW_UABS_G2_NC:
  47             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
  48                             (val >> 32 & 0xffff) << 5));
  49             return;
  50         case R_AARCH64_MOVW_UABS_G3:
  51             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
  52                             (val >> 48 & 0xffff) << 5));
  53             return;
  54         case R_AARCH64_ADR_PREL_PG_HI21: {
  55             uint64_t off = (val >> 12) - (addr >> 12);
  56             if ((off + ((uint64_t)1 << 20)) >> 21)
  57                 tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
  58             write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
  59                             (off & 0x1ffffc) << 3 | (off & 3) << 29));
  60             return;
  61         }
  62         case R_AARCH64_ADD_ABS_LO12_NC:
  63             write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
  64                             (val & 0xfff) << 10));
  65             return;
  66         case R_AARCH64_JUMP26:
  67         case R_AARCH64_CALL26:
  68 #ifdef DEBUG_RELOC
  69             printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
  70                     (char *) symtab_section->link->data + sym->st_name);
  71 #endif
  72             if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
  73               {
  74                 tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed (val=%lx, addr=%lx)", addr, val);
  75               }
  76             write32le(ptr, (0x14000000 |
  77                             (uint32_t)(type == R_AARCH64_CALL26) << 31 |
  78                             ((val - addr) >> 2 & 0x3ffffff)));
  79             return;
  80         case R_AARCH64_ADR_GOT_PAGE: {
  81             uint64_t off =
  82                 (((s1->got->sh_addr +
  83                    s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
  84             if ((off + ((uint64_t)1 << 20)) >> 21)
  85                 tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
  86             write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
  87                             (off & 0x1ffffc) << 3 | (off & 3) << 29));
  88             return;
  89         }
  90         case R_AARCH64_LD64_GOT_LO12_NC:
  91             write32le(ptr,
  92                       ((read32le(ptr) & 0xfff803ff) |
  93                        ((s1->got->sh_addr +
  94                          s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7));
  95             return;
  96         case R_AARCH64_COPY:
  97             return;
  98         case R_AARCH64_GLOB_DAT:
  99         case R_AARCH64_JUMP_SLOT:
 100             /* They don't need addend */
 101 #ifdef DEBUG_RELOC
 102             printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
 103                     val - rel->r_addend,
 104                     (char *) symtab_section->link->data + sym->st_name);
 105 #endif
 106             write64le(ptr, val - rel->r_addend);
 107             return;
 108         default:
 109             fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
 110                     type, (unsigned)addr, ptr, (unsigned)val);
 111             return;
 112     }
 113 }