diff options
Diffstat (limited to 'tinyc/x86_64-link.c')
| -rw-r--r-- | tinyc/x86_64-link.c | 295 |
1 files changed, 0 insertions, 295 deletions
diff --git a/tinyc/x86_64-link.c b/tinyc/x86_64-link.c deleted file mode 100644 index c0c5e13bf..000000000 --- a/tinyc/x86_64-link.c +++ /dev/null @@ -1,295 +0,0 @@ -#ifdef TARGET_DEFS_ONLY - -#define EM_TCC_TARGET EM_X86_64 - -/* relocation type for 32 bit data relocation */ -#define R_DATA_32 R_X86_64_32S -#define R_DATA_PTR R_X86_64_64 -#define R_JMP_SLOT R_X86_64_JUMP_SLOT -#define R_GLOB_DAT R_X86_64_GLOB_DAT -#define R_COPY R_X86_64_COPY -#define R_RELATIVE R_X86_64_RELATIVE - -#define R_NUM R_X86_64_NUM - -#define ELF_START_ADDR 0x400000 -#define ELF_PAGE_SIZE 0x200000 - -#define PCRELATIVE_DLLPLT 1 -#define RELOCATE_DLLPLT 1 - -#else /* !TARGET_DEFS_ONLY */ - -#include "tcc.h" - -/* Returns 1 for a code relocation, 0 for a data relocation. For unknown - relocations, returns -1. */ -int code_reloc (int reloc_type) -{ - switch (reloc_type) { - case R_X86_64_32: - case R_X86_64_32S: - case R_X86_64_64: - case R_X86_64_GOTPC32: - case R_X86_64_GOTPC64: - case R_X86_64_GOTPCREL: - case R_X86_64_GOTPCRELX: - case R_X86_64_REX_GOTPCRELX: - case R_X86_64_GOTTPOFF: - case R_X86_64_GOT32: - case R_X86_64_GOT64: - case R_X86_64_GLOB_DAT: - case R_X86_64_COPY: - case R_X86_64_RELATIVE: - case R_X86_64_GOTOFF64: - return 0; - - case R_X86_64_PC32: - case R_X86_64_PC64: - case R_X86_64_PLT32: - case R_X86_64_PLTOFF64: - case R_X86_64_JUMP_SLOT: - return 1; - } - - tcc_error ("Unknown relocation type: %d", reloc_type); - return -1; -} - -/* Returns an enumerator to describe whether and when the relocation needs a - GOT and/or PLT entry to be created. See tcc.h for a description of the - different values. */ -int gotplt_entry_type (int reloc_type) -{ - switch (reloc_type) { - case R_X86_64_GLOB_DAT: - case R_X86_64_JUMP_SLOT: - case R_X86_64_COPY: - case R_X86_64_RELATIVE: - return NO_GOTPLT_ENTRY; - - /* The following relocs wouldn't normally need GOT or PLT - slots, but we need them for simplicity in the link - editor part. See our caller for comments. */ - case R_X86_64_32: - case R_X86_64_32S: - case R_X86_64_64: - case R_X86_64_PC32: - case R_X86_64_PC64: - return AUTO_GOTPLT_ENTRY; - - case R_X86_64_GOTTPOFF: - return BUILD_GOT_ONLY; - - case R_X86_64_GOT32: - case R_X86_64_GOT64: - case R_X86_64_GOTPC32: - case R_X86_64_GOTPC64: - case R_X86_64_GOTOFF64: - case R_X86_64_GOTPCREL: - case R_X86_64_GOTPCRELX: - case R_X86_64_REX_GOTPCRELX: - case R_X86_64_PLT32: - case R_X86_64_PLTOFF64: - return ALWAYS_GOTPLT_ENTRY; - } - - tcc_error ("Unknown relocation type: %d", reloc_type); - return -1; -} - -ST_FUNC unsigned create_plt_entry(TCCState *s1, unsigned got_offset, struct sym_attr *attr) -{ - Section *plt = s1->plt; - uint8_t *p; - int modrm; - unsigned plt_offset, relofs; - - modrm = 0x25; - - /* empty PLT: create PLT0 entry that pushes the library identifier - (GOT + PTR_SIZE) and jumps to ld.so resolution routine - (GOT + 2 * PTR_SIZE) */ - if (plt->data_offset == 0) { - p = section_ptr_add(plt, 16); - p[0] = 0xff; /* pushl got + PTR_SIZE */ - p[1] = modrm + 0x10; - write32le(p + 2, PTR_SIZE); - p[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */ - p[7] = modrm; - write32le(p + 8, PTR_SIZE * 2); - } - plt_offset = plt->data_offset; - - /* The PLT slot refers to the relocation entry it needs via offset. - The reloc entry is created below, so its offset is the current - data_offset */ - relofs = s1->got->reloc ? s1->got->reloc->data_offset : 0; - - /* Jump to GOT entry where ld.so initially put the address of ip + 4 */ - p = section_ptr_add(plt, 16); - p[0] = 0xff; /* jmp *(got + x) */ - p[1] = modrm; - write32le(p + 2, got_offset); - p[6] = 0x68; /* push $xxx */ - /* On x86-64, the relocation is referred to by _index_ */ - write32le(p + 7, relofs / sizeof (ElfW_Rel)); - p[11] = 0xe9; /* jmp plt_start */ - write32le(p + 12, -(plt->data_offset)); - return plt_offset; -} - -/* relocate the PLT: compute addresses and offsets in the PLT now that final - address for PLT and GOT are known (see fill_program_header) */ -ST_FUNC void relocate_plt(TCCState *s1) -{ - uint8_t *p, *p_end; - - if (!s1->plt) - return; - - p = s1->plt->data; - p_end = p + s1->plt->data_offset; - - if (p < p_end) { - int x = s1->got->sh_addr - s1->plt->sh_addr - 6; - add32le(p + 2, x); - add32le(p + 8, x - 6); - p += 16; - while (p < p_end) { - add32le(p + 2, x + s1->plt->data - p); - p += 16; - } - } -} - -static ElfW_Rel *qrel; /* ptr to next reloc entry reused */ - -void relocate_init(Section *sr) -{ - qrel = (ElfW_Rel *) sr->data; -} - -void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned char *ptr, addr_t addr, addr_t val) -{ - int sym_index, esym_index; - - sym_index = ELFW(R_SYM)(rel->r_info); - - switch (type) { - case R_X86_64_64: - if (s1->output_type == TCC_OUTPUT_DLL) { - esym_index = s1->sym_attrs[sym_index].dyn_index; - qrel->r_offset = rel->r_offset; - if (esym_index) { - qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_64); - qrel->r_addend = rel->r_addend; - qrel++; - break; - } else { - qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE); - qrel->r_addend = read64le(ptr) + val; - qrel++; - } - } - add64le(ptr, val); - break; - case R_X86_64_32: - case R_X86_64_32S: - if (s1->output_type == TCC_OUTPUT_DLL) { - /* XXX: this logic may depend on TCC's codegen - now TCC uses R_X86_64_32 even for a 64bit pointer */ - qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE); - /* Use sign extension! */ - qrel->r_addend = (int)read32le(ptr) + val; - qrel++; - } - add32le(ptr, val); - break; - - case R_X86_64_PC32: - if (s1->output_type == TCC_OUTPUT_DLL) { - /* DLL relocation */ - esym_index = s1->sym_attrs[sym_index].dyn_index; - if (esym_index) { - qrel->r_offset = rel->r_offset; - qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32); - /* Use sign extension! */ - qrel->r_addend = (int)read32le(ptr) + rel->r_addend; - qrel++; - break; - } - } - goto plt32pc32; - - case R_X86_64_PLT32: - /* fallthrough: val already holds the PLT slot address */ - - plt32pc32: - { - long long diff; - diff = (long long)val - addr; - if (diff < -2147483648LL || diff > 2147483647LL) { - tcc_error("internal error: relocation failed"); - } - add32le(ptr, diff); - } - break; - - case R_X86_64_PLTOFF64: - add64le(ptr, val - s1->got->sh_addr + rel->r_addend); - break; - - case R_X86_64_PC64: - if (s1->output_type == TCC_OUTPUT_DLL) { - /* DLL relocation */ - esym_index = s1->sym_attrs[sym_index].dyn_index; - if (esym_index) { - qrel->r_offset = rel->r_offset; - qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC64); - qrel->r_addend = read64le(ptr) + rel->r_addend; - qrel++; - break; - } - } - add64le(ptr, val - addr); - break; - - case R_X86_64_GLOB_DAT: - case R_X86_64_JUMP_SLOT: - /* They don't need addend */ - write64le(ptr, val - rel->r_addend); - break; - case R_X86_64_GOTPCREL: - case R_X86_64_GOTPCRELX: - case R_X86_64_REX_GOTPCRELX: - add32le(ptr, s1->got->sh_addr - addr + - s1->sym_attrs[sym_index].got_offset - 4); - break; - case R_X86_64_GOTPC32: - add32le(ptr, s1->got->sh_addr - addr + rel->r_addend); - break; - case R_X86_64_GOTPC64: - add64le(ptr, s1->got->sh_addr - addr + rel->r_addend); - break; - case R_X86_64_GOTTPOFF: - add32le(ptr, val - s1->got->sh_addr); - break; - case R_X86_64_GOT32: - /* we load the got offset */ - add32le(ptr, s1->sym_attrs[sym_index].got_offset); - break; - case R_X86_64_GOT64: - /* we load the got offset */ - add64le(ptr, s1->sym_attrs[sym_index].got_offset); - break; - case R_X86_64_GOTOFF64: - add64le(ptr, val - s1->got->sh_addr); - break; - case R_X86_64_RELATIVE: - /* do nothing */ - break; - } -} - -#endif /* !TARGET_DEFS_ONLY */ |