[331] | 1 | #ifdef TARGET_DEFS_ONLY
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| 2 |
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| 3 | #define EM_TCC_TARGET EM_AARCH64
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| 4 |
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| 5 | #define R_DATA_32 R_AARCH64_ABS32
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| 6 | #define R_DATA_PTR R_AARCH64_ABS64
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| 7 | #define R_JMP_SLOT R_AARCH64_JUMP_SLOT
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| 8 | #define R_GLOB_DAT R_AARCH64_GLOB_DAT
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| 9 | #define R_COPY R_AARCH64_COPY
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| 10 | #define R_RELATIVE R_AARCH64_RELATIVE
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| 11 |
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| 12 | #define R_NUM R_AARCH64_NUM
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| 13 |
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| 14 | #define ELF_START_ADDR 0x00400000
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| 15 | #define ELF_PAGE_SIZE 0x1000
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| 16 |
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| 17 | #define PCRELATIVE_DLLPLT 1
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| 18 | #define RELOCATE_DLLPLT 1
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| 19 |
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| 20 | #else /* !TARGET_DEFS_ONLY */
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| 21 |
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| 22 | #include "tcc.h"
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| 23 |
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| 24 | /* Returns 1 for a code relocation, 0 for a data relocation. For unknown
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| 25 | relocations, returns -1. */
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| 26 | int code_reloc (int reloc_type)
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| 27 | {
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| 28 | switch (reloc_type) {
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| 29 | case R_AARCH64_ABS32:
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| 30 | case R_AARCH64_ABS64:
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| 31 | case R_AARCH64_PREL32:
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| 32 | case R_AARCH64_MOVW_UABS_G0_NC:
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| 33 | case R_AARCH64_MOVW_UABS_G1_NC:
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| 34 | case R_AARCH64_MOVW_UABS_G2_NC:
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| 35 | case R_AARCH64_MOVW_UABS_G3:
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| 36 | case R_AARCH64_ADR_PREL_PG_HI21:
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| 37 | case R_AARCH64_ADD_ABS_LO12_NC:
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| 38 | case R_AARCH64_ADR_GOT_PAGE:
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| 39 | case R_AARCH64_LD64_GOT_LO12_NC:
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| 40 | case R_AARCH64_GLOB_DAT:
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| 41 | case R_AARCH64_COPY:
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| 42 | return 0;
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| 43 |
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| 44 | case R_AARCH64_JUMP26:
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| 45 | case R_AARCH64_CALL26:
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| 46 | case R_AARCH64_JUMP_SLOT:
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| 47 | return 1;
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| 48 | }
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| 49 |
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| 50 | tcc_error ("Unknown relocation type: %d", reloc_type);
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| 51 | return -1;
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| 52 | }
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| 53 |
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| 54 | /* Returns an enumerator to describe whether and when the relocation needs a
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| 55 | GOT and/or PLT entry to be created. See tcc.h for a description of the
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| 56 | different values. */
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| 57 | int gotplt_entry_type (int reloc_type)
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| 58 | {
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| 59 | switch (reloc_type) {
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| 60 | case R_AARCH64_PREL32:
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| 61 | case R_AARCH64_MOVW_UABS_G0_NC:
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| 62 | case R_AARCH64_MOVW_UABS_G1_NC:
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| 63 | case R_AARCH64_MOVW_UABS_G2_NC:
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| 64 | case R_AARCH64_MOVW_UABS_G3:
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| 65 | case R_AARCH64_ADR_PREL_PG_HI21:
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| 66 | case R_AARCH64_ADD_ABS_LO12_NC:
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| 67 | case R_AARCH64_GLOB_DAT:
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| 68 | case R_AARCH64_JUMP_SLOT:
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| 69 | case R_AARCH64_COPY:
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| 70 | return NO_GOTPLT_ENTRY;
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| 71 |
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| 72 | case R_AARCH64_ABS32:
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| 73 | case R_AARCH64_ABS64:
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| 74 | case R_AARCH64_JUMP26:
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| 75 | case R_AARCH64_CALL26:
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| 76 | return AUTO_GOTPLT_ENTRY;
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| 77 |
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| 78 | case R_AARCH64_ADR_GOT_PAGE:
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| 79 | case R_AARCH64_LD64_GOT_LO12_NC:
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| 80 | return ALWAYS_GOTPLT_ENTRY;
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| 81 | }
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| 82 |
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| 83 | tcc_error ("Unknown relocation type: %d", reloc_type);
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| 84 | return -1;
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| 85 | }
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| 86 |
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| 87 | ST_FUNC unsigned create_plt_entry(TCCState *s1, unsigned got_offset, struct sym_attr *attr)
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| 88 | {
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| 89 | Section *plt = s1->plt;
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| 90 | uint8_t *p;
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| 91 | unsigned plt_offset;
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| 92 |
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| 93 | if (s1->output_type == TCC_OUTPUT_DLL)
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| 94 | tcc_error("DLLs unimplemented!");
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| 95 |
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| 96 | if (plt->data_offset == 0) {
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| 97 | section_ptr_add(plt, 32);
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| 98 | }
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| 99 | plt_offset = plt->data_offset;
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| 100 |
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| 101 | p = section_ptr_add(plt, 16);
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| 102 | write32le(p, got_offset);
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| 103 | write32le(p + 4, (uint64_t) got_offset >> 32);
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| 104 | return plt_offset;
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| 105 | }
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| 106 |
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| 107 | /* relocate the PLT: compute addresses and offsets in the PLT now that final
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| 108 | address for PLT and GOT are known (see fill_program_header) */
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| 109 | ST_FUNC void relocate_plt(TCCState *s1)
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| 110 | {
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| 111 | uint8_t *p, *p_end;
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| 112 |
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| 113 | if (!s1->plt)
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| 114 | return;
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| 115 |
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| 116 | p = s1->plt->data;
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| 117 | p_end = p + s1->plt->data_offset;
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| 118 |
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| 119 | if (p < p_end) {
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| 120 | uint64_t plt = s1->plt->sh_addr;
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| 121 | uint64_t got = s1->got->sh_addr;
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| 122 | uint64_t off = (got >> 12) - (plt >> 12);
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| 123 | if ((off + ((uint32_t)1 << 20)) >> 21)
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| 124 | tcc_error("Failed relocating PLT (off=0x%lx, got=0x%lx, plt=0x%lx)", off, got, plt);
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| 125 | write32le(p, 0xa9bf7bf0); // stp x16,x30,[sp,#-16]!
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| 126 | write32le(p + 4, (0x90000010 | // adrp x16,...
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| 127 | (off & 0x1ffffc) << 3 | (off & 3) << 29));
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| 128 | write32le(p + 8, (0xf9400211 | // ldr x17,[x16,#...]
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| 129 | (got & 0xff8) << 7));
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| 130 | write32le(p + 12, (0x91000210 | // add x16,x16,#...
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| 131 | (got & 0xfff) << 10));
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| 132 | write32le(p + 16, 0xd61f0220); // br x17
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| 133 | write32le(p + 20, 0xd503201f); // nop
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| 134 | write32le(p + 24, 0xd503201f); // nop
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| 135 | write32le(p + 28, 0xd503201f); // nop
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| 136 | p += 32;
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| 137 | while (p < p_end) {
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| 138 | uint64_t pc = plt + (p - s1->plt->data);
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| 139 | uint64_t addr = got + read64le(p);
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| 140 | uint64_t off = (addr >> 12) - (pc >> 12);
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| 141 | if ((off + ((uint32_t)1 << 20)) >> 21)
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| 142 | tcc_error("Failed relocating PLT (off=0x%lx, addr=0x%lx, pc=0x%lx)", off, addr, pc);
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| 143 | write32le(p, (0x90000010 | // adrp x16,...
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| 144 | (off & 0x1ffffc) << 3 | (off & 3) << 29));
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| 145 | write32le(p + 4, (0xf9400211 | // ldr x17,[x16,#...]
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| 146 | (addr & 0xff8) << 7));
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| 147 | write32le(p + 8, (0x91000210 | // add x16,x16,#...
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| 148 | (addr & 0xfff) << 10));
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| 149 | write32le(p + 12, 0xd61f0220); // br x17
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| 150 | p += 16;
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| 151 | }
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| 152 | }
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| 153 | }
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| 154 |
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| 155 | void relocate_init(Section *sr) {}
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| 156 |
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| 157 | void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned char *ptr, addr_t addr, addr_t val)
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| 158 | {
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| 159 | int sym_index = ELFW(R_SYM)(rel->r_info);
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| 160 | #ifdef DEBUG_RELOC
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| 161 | ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
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| 162 | #endif
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| 163 |
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| 164 | switch(type) {
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| 165 | case R_AARCH64_ABS64:
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| 166 | write64le(ptr, val);
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| 167 | return;
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| 168 | case R_AARCH64_ABS32:
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| 169 | write32le(ptr, val);
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| 170 | return;
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| 171 | case R_AARCH64_PREL32:
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| 172 | write32le(ptr, val - addr);
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| 173 | return;
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| 174 | case R_AARCH64_MOVW_UABS_G0_NC:
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| 175 | write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
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| 176 | (val & 0xffff) << 5));
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| 177 | return;
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| 178 | case R_AARCH64_MOVW_UABS_G1_NC:
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| 179 | write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
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| 180 | (val >> 16 & 0xffff) << 5));
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| 181 | return;
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| 182 | case R_AARCH64_MOVW_UABS_G2_NC:
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| 183 | write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
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| 184 | (val >> 32 & 0xffff) << 5));
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| 185 | return;
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| 186 | case R_AARCH64_MOVW_UABS_G3:
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| 187 | write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
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| 188 | (val >> 48 & 0xffff) << 5));
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| 189 | return;
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| 190 | case R_AARCH64_ADR_PREL_PG_HI21: {
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| 191 | uint64_t off = (val >> 12) - (addr >> 12);
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| 192 | if ((off + ((uint64_t)1 << 20)) >> 21)
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| 193 | tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
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| 194 | write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
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| 195 | (off & 0x1ffffc) << 3 | (off & 3) << 29));
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| 196 | return;
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| 197 | }
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| 198 | case R_AARCH64_ADD_ABS_LO12_NC:
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| 199 | write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
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| 200 | (val & 0xfff) << 10));
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| 201 | return;
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| 202 | case R_AARCH64_JUMP26:
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| 203 | case R_AARCH64_CALL26:
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| 204 | #ifdef DEBUG_RELOC
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| 205 | printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
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| 206 | (char *) symtab_section->link->data + sym->st_name);
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| 207 | #endif
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| 208 | if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
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| 209 | tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed"
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| 210 | " (val=%lx, addr=%lx)", val, addr);
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| 211 | write32le(ptr, (0x14000000 |
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| 212 | (uint32_t)(type == R_AARCH64_CALL26) << 31 |
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| 213 | ((val - addr) >> 2 & 0x3ffffff)));
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| 214 | return;
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| 215 | case R_AARCH64_ADR_GOT_PAGE: {
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| 216 | uint64_t off =
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| 217 | (((s1->got->sh_addr +
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| 218 | s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
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| 219 | if ((off + ((uint64_t)1 << 20)) >> 21)
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| 220 | tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
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| 221 | write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
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| 222 | (off & 0x1ffffc) << 3 | (off & 3) << 29));
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| 223 | return;
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| 224 | }
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| 225 | case R_AARCH64_LD64_GOT_LO12_NC:
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| 226 | write32le(ptr,
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| 227 | ((read32le(ptr) & 0xfff803ff) |
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| 228 | ((s1->got->sh_addr +
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| 229 | s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7));
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| 230 | return;
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| 231 | case R_AARCH64_COPY:
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| 232 | return;
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| 233 | case R_AARCH64_GLOB_DAT:
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| 234 | case R_AARCH64_JUMP_SLOT:
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| 235 | /* They don't need addend */
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| 236 | #ifdef DEBUG_RELOC
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| 237 | printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
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| 238 | val - rel->r_addend,
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| 239 | (char *) symtab_section->link->data + sym->st_name);
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| 240 | #endif
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| 241 | write64le(ptr, val - rel->r_addend);
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| 242 | return;
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| 243 | case R_AARCH64_RELATIVE:
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| 244 | #ifdef TCC_TARGET_PE
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| 245 | add32le(ptr, val - s1->pe_imagebase);
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| 246 | #endif
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| 247 | /* do nothing */
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| 248 | return;
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| 249 | default:
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| 250 | fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
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| 251 | type, (unsigned)addr, ptr, (unsigned)val);
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| 252 | return;
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| 253 | }
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| 254 | }
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| 255 |
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| 256 | #endif /* !TARGET_DEFS_ONLY */
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