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 #define PCRELATIVE_DLLPLT 1
  18
  19 #else /* !TARGET_DEFS_ONLY */
  20
  21 #include "tcc.h"
  22
  23 /* Returns 1 for a code relocation, 0 for a data relocation. For unknown
  24    relocations, returns -1. */
  25 int code_reloc (int reloc_type)
  26 {
  27     switch (reloc_type) {
  28         case R_AARCH64_ABS32:
  29         case R_AARCH64_ABS64:
  30         case R_AARCH64_MOVW_UABS_G0_NC:
  31         case R_AARCH64_MOVW_UABS_G1_NC:
  32         case R_AARCH64_MOVW_UABS_G2_NC:
  33         case R_AARCH64_MOVW_UABS_G3:
  34         case R_AARCH64_ADR_PREL_PG_HI21:
  35         case R_AARCH64_ADD_ABS_LO12_NC:
  36         case R_AARCH64_ADR_GOT_PAGE:
  37         case R_AARCH64_LD64_GOT_LO12_NC:
  38         case R_AARCH64_GLOB_DAT:
  39         case R_AARCH64_COPY:
  40             return 0;
  41
  42         case R_AARCH64_JUMP26:
  43         case R_AARCH64_CALL26:
  44         case R_AARCH64_JUMP_SLOT:
  45             return 1;
  46     }
  47
  48     tcc_error ("Unknown relocation type: %d", reloc_type);
  49     return -1;
  50 }
  51
  52 /* Returns an enumerator to describe wether and when the relocation needs a
  53    GOT and/or PLT entry to be created. See tcc.h for a description of the
  54    different values. */
  55 int gotplt_entry_type (int reloc_type)
  56 {
  57     switch (reloc_type) {
  58         case R_AARCH64_ABS32:
  59         case R_AARCH64_ABS64:
  60         case R_AARCH64_MOVW_UABS_G0_NC:
  61         case R_AARCH64_MOVW_UABS_G1_NC:
  62         case R_AARCH64_MOVW_UABS_G2_NC:
  63         case R_AARCH64_MOVW_UABS_G3:
  64         case R_AARCH64_ADR_PREL_PG_HI21:
  65         case R_AARCH64_ADD_ABS_LO12_NC:
  66         case R_AARCH64_GLOB_DAT:
  67         case R_AARCH64_JUMP_SLOT:
  68         case R_AARCH64_COPY:
  69             return NO_GOTPLT_ENTRY;
  70
  71         case R_AARCH64_JUMP26:
  72         case R_AARCH64_CALL26:
  73             return AUTO_GOTPLT_ENTRY;
  74
  75         case R_AARCH64_ADR_GOT_PAGE:
  76         case R_AARCH64_LD64_GOT_LO12_NC:
  77             return ALWAYS_GOTPLT_ENTRY;
  78     }
  79
  80     tcc_error ("Unknown relocation type: %d", reloc_type);
  81     return -1;
  82 }
  83
  84 void relocate_init(Section *sr) {}
  85
  86 void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
  87 {
  88     int sym_index = ELFW(R_SYM)(rel->r_info);
  89 #ifdef DEBUG_RELOC
  90     ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
  91 #endif
  92
  93     switch(type) {
  94         case R_AARCH64_ABS64:
  95             write64le(ptr, val);
  96             return;
  97         case R_AARCH64_ABS32:
  98             write32le(ptr, val);
  99             return;
 100         case R_AARCH64_MOVW_UABS_G0_NC:
 101             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
 102                             (val & 0xffff) << 5));
 103             return;
 104         case R_AARCH64_MOVW_UABS_G1_NC:
 105             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
 106                             (val >> 16 & 0xffff) << 5));
 107             return;
 108         case R_AARCH64_MOVW_UABS_G2_NC:
 109             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
 110                             (val >> 32 & 0xffff) << 5));
 111             return;
 112         case R_AARCH64_MOVW_UABS_G3:
 113             write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
 114                             (val >> 48 & 0xffff) << 5));
 115             return;
 116         case R_AARCH64_ADR_PREL_PG_HI21: {
 117             uint64_t off = (val >> 12) - (addr >> 12);
 118             if ((off + ((uint64_t)1 << 20)) >> 21)
 119                 tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
 120             write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
 121                             (off & 0x1ffffc) << 3 | (off & 3) << 29));
 122             return;
 123         }
 124         case R_AARCH64_ADD_ABS_LO12_NC:
 125             write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
 126                             (val & 0xfff) << 10));
 127             return;
 128         case R_AARCH64_JUMP26:
 129         case R_AARCH64_CALL26:
 130 #ifdef DEBUG_RELOC
 131             printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
 132                     (char *) symtab_section->link->data + sym->st_name);
 133 #endif
 134             if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
 135                 tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed"
 136                           " (val=%lx, addr=%lx)", val, addr);
 137             write32le(ptr, (0x14000000 |
 138                             (uint32_t)(type == R_AARCH64_CALL26) << 31 |
 139                             ((val - addr) >> 2 & 0x3ffffff)));
 140             return;
 141         case R_AARCH64_ADR_GOT_PAGE: {
 142             uint64_t off =
 143                 (((s1->got->sh_addr +
 144                    s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
 145             if ((off + ((uint64_t)1 << 20)) >> 21)
 146                 tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
 147             write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
 148                             (off & 0x1ffffc) << 3 | (off & 3) << 29));
 149             return;
 150         }
 151         case R_AARCH64_LD64_GOT_LO12_NC:
 152             write32le(ptr,
 153                       ((read32le(ptr) & 0xfff803ff) |
 154                        ((s1->got->sh_addr +
 155                          s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7));
 156             return;
 157         case R_AARCH64_COPY:
 158             return;
 159         case R_AARCH64_GLOB_DAT:
 160         case R_AARCH64_JUMP_SLOT:
 161             /* They don't need addend */
 162 #ifdef DEBUG_RELOC
 163             printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
 164                     val - rel->r_addend,
 165                     (char *) symtab_section->link->data + sym->st_name);
 166 #endif
 167             write64le(ptr, val - rel->r_addend);
 168             return;
 169         default:
 170             fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
 171                     type, (unsigned)addr, ptr, (unsigned)val);
 172             return;
 173     }
 174 }
 175
 176 #endif /* !TARGET_DEFS_ONLY */