arm64-link.c

   1 #ifdef TARGET_DEFS_ONLY
   2
   3 #define EM_TCC_TARGET EM_AARCH64
   4
   5 #define R_DATA_32  R_AARCH64_ABS32
   6 #define R_DATA_PTR R_AARCH64_ABS64
   7 #define R_JMP_SLOT R_AARCH64_JUMP_SLOT
   8 #define R_GLOB_DAT R_AARCH64_GLOB_DAT
   9 #define R_COPY     R_AARCH64_COPY
  10
  11 #define R_NUM      R_AARCH64_NUM
  12
  13 #define ELF_START_ADDR 0x00400000
  14 #define ELF_PAGE_SIZE 0x1000
  15
  16 #define HAVE_SECTION_RELOC
  17
  18 #else /* !TARGET_DEFS_ONLY */
  19
  20 #include "tcc.h"
  21
  22 ST_DATA struct reloc_info relocs_info[R_NUM] = {
  23     INIT_RELOC_INFO (R_AARCH64_ABS32, 0, NO_GOTPLT_ENTRY, 0)
  24     INIT_RELOC_INFO (R_AARCH64_ABS64, 0, NO_GOTPLT_ENTRY, 0)
  25     INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G0_NC, 0, NO_GOTPLT_ENTRY, 0)
  26     INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G1_NC, 0, NO_GOTPLT_ENTRY, 0)
  27     INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G2_NC, 0, NO_GOTPLT_ENTRY, 0)
  28     INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G3, 0, NO_GOTPLT_ENTRY, 0)
  29     INIT_RELOC_INFO (R_AARCH64_ADR_PREL_PG_HI21, 0, NO_GOTPLT_ENTRY, 0)
  30     INIT_RELOC_INFO (R_AARCH64_ADD_ABS_LO12_NC, 0, NO_GOTPLT_ENTRY, 0)
  31     INIT_RELOC_INFO (R_AARCH64_JUMP26, 1, AUTO_GOTPLT_ENTRY, 1)
  32     INIT_RELOC_INFO (R_AARCH64_CALL26, 1, AUTO_GOTPLT_ENTRY, 1)
  33     INIT_RELOC_INFO (R_AARCH64_ADR_GOT_PAGE, 0, ALWAYS_GOTPLT_ENTRY, 0)
  34     INIT_RELOC_INFO (R_AARCH64_LD64_GOT_LO12_NC, 0, ALWAYS_GOTPLT_ENTRY, 0)
  35     INIT_RELOC_INFO (R_AARCH64_GLOB_DAT, 0, NO_GOTPLT_ENTRY, 0)
  36     INIT_RELOC_INFO (R_AARCH64_JUMP_SLOT, 1, NO_GOTPLT_ENTRY, 0)
  37 };
  38
  39 void relocate_init(Section *sr) {}
  40
  41 void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
  42 {
  43     ElfW(Sym) *sym;
  44     int sym_index;
  45
  46     sym_index = ELFW(R_SYM)(rel->r_info);
  47     sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
  48
  49     switch(type) {
  50         case R_AARCH64_ABS64:
  51             write64le(ptr, val);
  52             return;
  53         case R_AARCH64_ABS32:
  54             write32le(ptr, val);
  55             return;
  56         case R_AARCH64_MOVW_UABS_G0_NC:
  57             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
  58                             (val & 0xffff) << 5));
  59             return;
  60         case R_AARCH64_MOVW_UABS_G1_NC:
  61             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
  62                             (val >> 16 & 0xffff) << 5));
  63             return;
  64         case R_AARCH64_MOVW_UABS_G2_NC:
  65             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
  66                             (val >> 32 & 0xffff) << 5));
  67             return;
  68         case R_AARCH64_MOVW_UABS_G3:
  69             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
  70                             (val >> 48 & 0xffff) << 5));
  71             return;
  72         case R_AARCH64_ADR_PREL_PG_HI21: {
  73             uint64_t off = (val >> 12) - (addr >> 12);
  74             if ((off + ((uint64_t)1 << 20)) >> 21)
  75                 tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
  76             write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
  77                             (off & 0x1ffffc) << 3 | (off & 3) << 29));
  78             return;
  79         }
  80         case R_AARCH64_ADD_ABS_LO12_NC:
  81             write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
  82                             (val & 0xfff) << 10));
  83             return;
  84         case R_AARCH64_JUMP26:
  85         case R_AARCH64_CALL26:
  86 #ifdef DEBUG_RELOC
  87             printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
  88                     (char *) symtab_section->link->data + sym->st_name);
  89 #endif
  90             if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
  91                 tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed"
  92                           " (val=%lx, addr=%lx)", val, addr);
  93             write32le(ptr, (0x14000000 |
  94                             (uint32_t)(type == R_AARCH64_CALL26) << 31 |
  95                             ((val - addr) >> 2 & 0x3ffffff)));
  96             return;
  97         case R_AARCH64_ADR_GOT_PAGE: {
  98             uint64_t off =
  99                 (((s1->got->sh_addr +
 100                    s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
 101             if ((off + ((uint64_t)1 << 20)) >> 21)
 102                 tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
 103             write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
 104                             (off & 0x1ffffc) << 3 | (off & 3) << 29));
 105             return;
 106         }
 107         case R_AARCH64_LD64_GOT_LO12_NC:
 108             write32le(ptr,
 109                       ((read32le(ptr) & 0xfff803ff) |
 110                        ((s1->got->sh_addr +
 111                          s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7));
 112             return;
 113         case R_AARCH64_COPY:
 114             return;
 115         case R_AARCH64_GLOB_DAT:
 116         case R_AARCH64_JUMP_SLOT:
 117             /* They don't need addend */
 118 #ifdef DEBUG_RELOC
 119             printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
 120                     val - rel->r_addend,
 121                     (char *) symtab_section->link->data + sym->st_name);
 122 #endif
 123             write64le(ptr, val - rel->r_addend);
 124             return;
 125         default:
 126             fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
 127                     type, (unsigned)addr, ptr, (unsigned)val);
 128             return;
 129     }
 130 }
 131
 132 #endif /* !TARGET_DEFS_ONLY */