add clang
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890 changed files with 229323 additions and 20 deletions
399
05/tcc-final/x86_64-link.c
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399
05/tcc-final/x86_64-link.c
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#ifdef TARGET_DEFS_ONLY
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#define EM_TCC_TARGET EM_X86_64
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/* relocation type for 32 bit data relocation */
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#define R_DATA_32 R_X86_64_32S
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#define R_DATA_PTR R_X86_64_64
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#define R_JMP_SLOT R_X86_64_JUMP_SLOT
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#define R_GLOB_DAT R_X86_64_GLOB_DAT
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#define R_COPY R_X86_64_COPY
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#define R_RELATIVE R_X86_64_RELATIVE
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#define R_NUM R_X86_64_NUM
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#define ELF_START_ADDR 0x400000
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#define ELF_PAGE_SIZE 0x200000
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#define PCRELATIVE_DLLPLT 1
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#define RELOCATE_DLLPLT 1
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#else /* !TARGET_DEFS_ONLY */
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#include "tcc.h"
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#ifdef NEED_RELOC_TYPE
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/* Returns 1 for a code relocation, 0 for a data relocation. For unknown
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relocations, returns -1. */
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int code_reloc (int reloc_type)
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{
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switch (reloc_type) {
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case R_X86_64_32:
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case R_X86_64_32S:
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case R_X86_64_64:
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case R_X86_64_GOTPC32:
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case R_X86_64_GOTPC64:
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case R_X86_64_GOTPCREL:
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case R_X86_64_GOTPCRELX:
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case R_X86_64_REX_GOTPCRELX:
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case R_X86_64_GOTTPOFF:
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case R_X86_64_GOT32:
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case R_X86_64_GOT64:
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case R_X86_64_GLOB_DAT:
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case R_X86_64_COPY:
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case R_X86_64_RELATIVE:
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case R_X86_64_GOTOFF64:
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case R_X86_64_TLSGD:
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case R_X86_64_TLSLD:
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case R_X86_64_DTPOFF32:
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case R_X86_64_TPOFF32:
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case R_X86_64_DTPOFF64:
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case R_X86_64_TPOFF64:
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return 0;
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case R_X86_64_PC32:
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case R_X86_64_PC64:
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case R_X86_64_PLT32:
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case R_X86_64_PLTOFF64:
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case R_X86_64_JUMP_SLOT:
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return 1;
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}
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return -1;
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}
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/* Returns an enumerator to describe whether and when the relocation needs a
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GOT and/or PLT entry to be created. See tcc.h for a description of the
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different values. */
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int gotplt_entry_type (int reloc_type)
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{
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switch (reloc_type) {
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case R_X86_64_GLOB_DAT:
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case R_X86_64_JUMP_SLOT:
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case R_X86_64_COPY:
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case R_X86_64_RELATIVE:
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return NO_GOTPLT_ENTRY;
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/* The following relocs wouldn't normally need GOT or PLT
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slots, but we need them for simplicity in the link
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editor part. See our caller for comments. */
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case R_X86_64_32:
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case R_X86_64_32S:
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case R_X86_64_64:
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case R_X86_64_PC32:
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case R_X86_64_PC64:
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return AUTO_GOTPLT_ENTRY;
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case R_X86_64_GOTTPOFF:
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return BUILD_GOT_ONLY;
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case R_X86_64_GOT32:
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case R_X86_64_GOT64:
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case R_X86_64_GOTPC32:
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case R_X86_64_GOTPC64:
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case R_X86_64_GOTOFF64:
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case R_X86_64_GOTPCREL:
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case R_X86_64_GOTPCRELX:
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case R_X86_64_TLSGD:
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case R_X86_64_TLSLD:
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case R_X86_64_DTPOFF32:
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case R_X86_64_TPOFF32:
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case R_X86_64_DTPOFF64:
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case R_X86_64_TPOFF64:
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case R_X86_64_REX_GOTPCRELX:
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case R_X86_64_PLT32:
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case R_X86_64_PLTOFF64:
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return ALWAYS_GOTPLT_ENTRY;
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}
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return -1;
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}
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#ifdef NEED_BUILD_GOT
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ST_FUNC unsigned create_plt_entry(TCCState *s1, unsigned got_offset, struct sym_attr *attr)
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{
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Section *plt = s1->plt;
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uint8_t *p;
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int modrm;
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unsigned plt_offset, relofs;
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modrm = 0x25;
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/* empty PLT: create PLT0 entry that pushes the library identifier
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(GOT + PTR_SIZE) and jumps to ld.so resolution routine
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(GOT + 2 * PTR_SIZE) */
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if (plt->data_offset == 0) {
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p = section_ptr_add(plt, 16);
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p[0] = 0xff; /* pushl got + PTR_SIZE */
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p[1] = modrm + 0x10;
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write32le(p + 2, PTR_SIZE);
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p[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */
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p[7] = modrm;
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write32le(p + 8, PTR_SIZE * 2);
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}
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plt_offset = plt->data_offset;
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/* The PLT slot refers to the relocation entry it needs via offset.
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The reloc entry is created below, so its offset is the current
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data_offset */
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relofs = s1->plt->reloc ? s1->plt->reloc->data_offset : 0;
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/* Jump to GOT entry where ld.so initially put the address of ip + 4 */
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p = section_ptr_add(plt, 16);
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p[0] = 0xff; /* jmp *(got + x) */
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p[1] = modrm;
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write32le(p + 2, got_offset);
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p[6] = 0x68; /* push $xxx */
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/* On x86-64, the relocation is referred to by _index_ */
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write32le(p + 7, relofs / sizeof (ElfW_Rel) - 1);
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p[11] = 0xe9; /* jmp plt_start */
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write32le(p + 12, -(plt->data_offset));
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return plt_offset;
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}
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/* relocate the PLT: compute addresses and offsets in the PLT now that final
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address for PLT and GOT are known (see fill_program_header) */
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ST_FUNC void relocate_plt(TCCState *s1)
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{
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uint8_t *p, *p_end;
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if (!s1->plt)
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return;
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p = s1->plt->data;
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p_end = p + s1->plt->data_offset;
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if (p < p_end) {
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int x = s1->got->sh_addr - s1->plt->sh_addr - 6;
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add32le(p + 2, x);
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add32le(p + 8, x - 6);
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p += 16;
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while (p < p_end) {
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add32le(p + 2, x + (s1->plt->data - p));
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p += 16;
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}
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}
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if (s1->plt->reloc) {
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ElfW_Rel *rel;
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int x = s1->plt->sh_addr + 16 + 6;
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p = s1->got->data;
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for_each_elem(s1->plt->reloc, 0, rel, ElfW_Rel) {
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write64le(p + rel->r_offset, x);
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x += 16;
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}
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}
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}
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#endif
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#endif
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void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned char *ptr, addr_t addr, addr_t val)
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{
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int sym_index, esym_index;
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sym_index = ELFW(R_SYM)(rel->r_info);
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switch (type) {
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case R_X86_64_64:
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if (s1->output_type == TCC_OUTPUT_DLL) {
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esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index;
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qrel->r_offset = rel->r_offset;
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if (esym_index) {
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qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_64);
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qrel->r_addend = rel->r_addend;
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qrel++;
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break;
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} else {
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qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
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qrel->r_addend = read64le(ptr) + val;
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qrel++;
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}
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}
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add64le(ptr, val);
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break;
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case R_X86_64_32:
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case R_X86_64_32S:
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if (s1->output_type == TCC_OUTPUT_DLL) {
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/* XXX: this logic may depend on TCC's codegen
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now TCC uses R_X86_64_32 even for a 64bit pointer */
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qrel->r_offset = rel->r_offset;
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qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
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/* Use sign extension! */
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qrel->r_addend = (int)read32le(ptr) + val;
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qrel++;
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}
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add32le(ptr, val);
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break;
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case R_X86_64_PC32:
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if (s1->output_type == TCC_OUTPUT_DLL) {
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/* DLL relocation */
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esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index;
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if (esym_index) {
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qrel->r_offset = rel->r_offset;
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qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32);
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/* Use sign extension! */
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qrel->r_addend = (int)read32le(ptr) + rel->r_addend;
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qrel++;
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break;
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}
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}
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goto plt32pc32;
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case R_X86_64_PLT32:
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/* fallthrough: val already holds the PLT slot address */
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plt32pc32:
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{
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long long diff;
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diff = (long long)val - addr;
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if (diff < -2147483648LL || diff > 2147483647LL) {
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tcc_error("internal error: relocation failed");
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}
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add32le(ptr, diff);
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}
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break;
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case R_X86_64_COPY:
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break;
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case R_X86_64_PLTOFF64:
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add64le(ptr, val - s1->got->sh_addr + rel->r_addend);
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break;
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case R_X86_64_PC64:
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if (s1->output_type == TCC_OUTPUT_DLL) {
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/* DLL relocation */
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esym_index = get_sym_attr(s1, sym_index, 0)->dyn_index;
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if (esym_index) {
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qrel->r_offset = rel->r_offset;
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qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC64);
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qrel->r_addend = read64le(ptr) + rel->r_addend;
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qrel++;
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break;
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}
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}
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add64le(ptr, val - addr);
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break;
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case R_X86_64_GLOB_DAT:
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case R_X86_64_JUMP_SLOT:
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/* They don't need addend */
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write64le(ptr, val - rel->r_addend);
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break;
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case R_X86_64_GOTPCREL:
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case R_X86_64_GOTPCRELX:
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case R_X86_64_REX_GOTPCRELX:
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add32le(ptr, s1->got->sh_addr - addr +
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get_sym_attr(s1, sym_index, 0)->got_offset - 4);
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break;
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case R_X86_64_GOTPC32:
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add32le(ptr, s1->got->sh_addr - addr + rel->r_addend);
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break;
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case R_X86_64_GOTPC64:
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add64le(ptr, s1->got->sh_addr - addr + rel->r_addend);
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break;
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case R_X86_64_GOTTPOFF:
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add32le(ptr, val - s1->got->sh_addr);
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break;
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case R_X86_64_GOT32:
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/* we load the got offset */
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add32le(ptr, get_sym_attr(s1, sym_index, 0)->got_offset);
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break;
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case R_X86_64_GOT64:
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/* we load the got offset */
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add64le(ptr, get_sym_attr(s1, sym_index, 0)->got_offset);
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break;
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case R_X86_64_GOTOFF64:
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add64le(ptr, val - s1->got->sh_addr);
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break;
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case R_X86_64_TLSGD:
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{
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static const unsigned char expect[] = {
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/* .byte 0x66; lea 0(%rip),%rdi */
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0x66, 0x48, 0x8d, 0x3d, 0x00, 0x00, 0x00, 0x00,
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/* .word 0x6666; rex64; call __tls_get_addr@PLT */
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0x66, 0x66, 0x48, 0xe8, 0x00, 0x00, 0x00, 0x00 };
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static const unsigned char replace[] = {
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/* mov %fs:0,%rax */
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0x64, 0x48, 0x8b, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00,
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/* lea -4(%rax),%rax */
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0x48, 0x8d, 0x80, 0x00, 0x00, 0x00, 0x00 };
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if (memcmp (ptr-4, expect, sizeof(expect)) == 0) {
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ElfW(Sym) *sym;
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Section *sec;
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int32_t x;
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memcpy(ptr-4, replace, sizeof(replace));
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rel[1].r_info = ELFW(R_INFO)(0, R_X86_64_NONE);
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sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
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sec = s1->sections[sym->st_shndx];
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x = sym->st_value - sec->sh_addr - sec->data_offset;
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add32le(ptr + 8, x);
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}
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else
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tcc_error("unexpected R_X86_64_TLSGD pattern");
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}
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break;
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case R_X86_64_TLSLD:
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{
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static const unsigned char expect[] = {
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/* lea 0(%rip),%rdi */
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0x48, 0x8d, 0x3d, 0x00, 0x00, 0x00, 0x00,
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/* call __tls_get_addr@PLT */
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0xe8, 0x00, 0x00, 0x00, 0x00 };
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static const unsigned char replace[] = {
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/* data16 data16 data16 mov %fs:0,%rax */
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0x66, 0x66, 0x66, 0x64, 0x48, 0x8b, 0x04, 0x25,
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0x00, 0x00, 0x00, 0x00 };
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if (memcmp (ptr-3, expect, sizeof(expect)) == 0) {
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memcpy(ptr-3, replace, sizeof(replace));
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rel[1].r_info = ELFW(R_INFO)(0, R_X86_64_NONE);
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}
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else
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tcc_error("unexpected R_X86_64_TLSLD pattern");
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}
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break;
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case R_X86_64_DTPOFF32:
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case R_X86_64_TPOFF32:
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{
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ElfW(Sym) *sym;
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Section *sec;
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int32_t x;
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sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
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sec = s1->sections[sym->st_shndx];
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x = val - sec->sh_addr - sec->data_offset;
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add32le(ptr, x);
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}
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break;
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case R_X86_64_DTPOFF64:
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case R_X86_64_TPOFF64:
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{
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ElfW(Sym) *sym;
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Section *sec;
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int32_t x;
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sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
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sec = s1->sections[sym->st_shndx];
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x = val - sec->sh_addr - sec->data_offset;
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add64le(ptr, x);
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}
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break;
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case R_X86_64_NONE:
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break;
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case R_X86_64_RELATIVE:
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#ifdef TCC_TARGET_PE
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add32le(ptr, val - s1->pe_imagebase);
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#endif
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/* do nothing */
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break;
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default:
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fprintf(stderr,"FIXME: handle reloc type %d at %x [%p] to %x\n",
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type, (unsigned)addr, ptr, (unsigned)val);
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break;
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}
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}
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#endif /* !TARGET_DEFS_ONLY */
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