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https://github.com/frida/tinycc
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0bf262864c
i386 target does not have PC relative loads. Its ABI therefore require ebx register to points to the GOT when executing a PLT entry. This means that PLT entry cannot be used transparently, the compiler needs to expect execution of a PLT entry to be able to use one, that is a PLT entry should only be created if the relocation explicitely asks for it (eg. R_386_PLT32). This patch creates a new target macro PCRELATIVE_DLLPLT to indicate whether a target can do a PC relative load in PLT entry when building a dynamic library. Executable do not normally pose a problem because they are loaded at a fixed address and thus the absolute address of GOT can be used. Note that in such a case, if the compiler does not use a PLT aware relocation for external access then the code relocation will fall on the dynamic loader since there is no PLT entry to relocate too.
133 lines
5.0 KiB
C
133 lines
5.0 KiB
C
#ifdef TARGET_DEFS_ONLY
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#define EM_TCC_TARGET EM_AARCH64
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#define R_DATA_32 R_AARCH64_ABS32
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#define R_DATA_PTR R_AARCH64_ABS64
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#define R_JMP_SLOT R_AARCH64_JUMP_SLOT
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#define R_GLOB_DAT R_AARCH64_GLOB_DAT
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#define R_COPY R_AARCH64_COPY
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#define R_NUM R_AARCH64_NUM
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#define ELF_START_ADDR 0x00400000
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#define ELF_PAGE_SIZE 0x1000
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#define HAVE_SECTION_RELOC
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#define PCRELATIVE_DLLPLT 1
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#else /* !TARGET_DEFS_ONLY */
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#include "tcc.h"
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ST_DATA struct reloc_info relocs_info[R_NUM] = {
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INIT_RELOC_INFO (R_AARCH64_ABS32, 0, NO_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_ABS64, 0, NO_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G0_NC, 0, NO_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G1_NC, 0, NO_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G2_NC, 0, NO_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_MOVW_UABS_G3, 0, NO_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_ADR_PREL_PG_HI21, 0, NO_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_ADD_ABS_LO12_NC, 0, NO_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_JUMP26, 1, AUTO_GOTPLT_ENTRY, 1)
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INIT_RELOC_INFO (R_AARCH64_CALL26, 1, AUTO_GOTPLT_ENTRY, 1)
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INIT_RELOC_INFO (R_AARCH64_ADR_GOT_PAGE, 0, ALWAYS_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_LD64_GOT_LO12_NC, 0, ALWAYS_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_GLOB_DAT, 0, NO_GOTPLT_ENTRY, 0)
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INIT_RELOC_INFO (R_AARCH64_JUMP_SLOT, 1, NO_GOTPLT_ENTRY, 0)
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};
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void relocate_init(Section *sr) {}
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void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
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{
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int sym_index = ELFW(R_SYM)(rel->r_info);
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#ifdef DEBUG_RELOC
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ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
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#endif
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switch(type) {
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case R_AARCH64_ABS64:
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write64le(ptr, val);
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return;
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case R_AARCH64_ABS32:
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write32le(ptr, val);
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return;
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case R_AARCH64_MOVW_UABS_G0_NC:
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write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
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(val & 0xffff) << 5));
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return;
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case R_AARCH64_MOVW_UABS_G1_NC:
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write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
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(val >> 16 & 0xffff) << 5));
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return;
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case R_AARCH64_MOVW_UABS_G2_NC:
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write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
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(val >> 32 & 0xffff) << 5));
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return;
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case R_AARCH64_MOVW_UABS_G3:
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write32le(ptr, ((read32le(ptr) & 0xffe0001f) |
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(val >> 48 & 0xffff) << 5));
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return;
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case R_AARCH64_ADR_PREL_PG_HI21: {
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uint64_t off = (val >> 12) - (addr >> 12);
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if ((off + ((uint64_t)1 << 20)) >> 21)
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tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
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write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
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(off & 0x1ffffc) << 3 | (off & 3) << 29));
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return;
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}
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case R_AARCH64_ADD_ABS_LO12_NC:
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write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
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(val & 0xfff) << 10));
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return;
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case R_AARCH64_JUMP26:
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case R_AARCH64_CALL26:
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#ifdef DEBUG_RELOC
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printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
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(char *) symtab_section->link->data + sym->st_name);
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#endif
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if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
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tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed"
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" (val=%lx, addr=%lx)", val, addr);
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write32le(ptr, (0x14000000 |
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(uint32_t)(type == R_AARCH64_CALL26) << 31 |
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((val - addr) >> 2 & 0x3ffffff)));
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return;
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case R_AARCH64_ADR_GOT_PAGE: {
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uint64_t off =
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(((s1->got->sh_addr +
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s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
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if ((off + ((uint64_t)1 << 20)) >> 21)
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tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
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write32le(ptr, ((read32le(ptr) & 0x9f00001f) |
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(off & 0x1ffffc) << 3 | (off & 3) << 29));
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return;
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}
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case R_AARCH64_LD64_GOT_LO12_NC:
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write32le(ptr,
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((read32le(ptr) & 0xfff803ff) |
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((s1->got->sh_addr +
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s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7));
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return;
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case R_AARCH64_COPY:
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return;
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case R_AARCH64_GLOB_DAT:
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case R_AARCH64_JUMP_SLOT:
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/* They don't need addend */
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#ifdef DEBUG_RELOC
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printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
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val - rel->r_addend,
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(char *) symtab_section->link->data + sym->st_name);
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#endif
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write64le(ptr, val - rel->r_addend);
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return;
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default:
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fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
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type, (unsigned)addr, ptr, (unsigned)val);
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return;
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}
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}
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#endif /* !TARGET_DEFS_ONLY */
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