mirror of
https://github.com/mirror/tinycc.git
synced 2025-01-21 05:40:09 +08:00
50b4f320dc
Currently tcc does not use lazy binding. It puts all relocations in the RELX
section and solve them all at startup.
This was not working on bsd.
tcc.h:
- New RELPLT_SECTION_FMT for plt relocations
- New entry relocplt in struct Section
tccelf.c:
- put_elf_reloca: put R_JMP_SLOT in relocplt section
- build_got_entries*: Use two passes because R_JMP_SLOT and R_GLOB_DAT
can not be intermixed on some targets (arm, arm64)
- layout_sections: Calculate correct size relocplt section for DT_ values.
Make sure relocplt is last
- fill_dynamic: Add DT_ values when got is filled
move DT_VERSYM because dynamic linker cannot handle it standone
- Add note section for NetBSD
arm-link.c/arm64-link.c/i386-link.c/riscv64-link.c/x86_64-link.c:
- fill got table with pointer to plt section or symbol value in case
of TCC_OUTPUT_MEMORY
arm-link.c/arm64-link.c:
- fix offset first plt entry
i386-link.c/x86_64-link.c:
- use correct reloc entry
- use relofs - sizeof (ElfW_Rel) because the reloc is already done
lib/bcheck.c:
- no __libc_freeres on FreeBSD and NetBSD
tests/Makefile:
- Add -fno-stack-protector for OpenBSD
tests/tests2/Makefile:
- disable 106_pthread/114_bound_signal
302 lines
10 KiB
C
302 lines
10 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_RELATIVE R_AARCH64_RELATIVE
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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 0x10000
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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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/* 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_AARCH64_ABS32:
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case R_AARCH64_ABS64:
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case R_AARCH64_PREL32:
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case R_AARCH64_MOVW_UABS_G0_NC:
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case R_AARCH64_MOVW_UABS_G1_NC:
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case R_AARCH64_MOVW_UABS_G2_NC:
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case R_AARCH64_MOVW_UABS_G3:
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case R_AARCH64_ADR_PREL_PG_HI21:
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case R_AARCH64_ADD_ABS_LO12_NC:
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case R_AARCH64_ADR_GOT_PAGE:
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case R_AARCH64_LD64_GOT_LO12_NC:
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case R_AARCH64_LDST64_ABS_LO12_NC:
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case R_AARCH64_GLOB_DAT:
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case R_AARCH64_COPY:
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return 0;
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case R_AARCH64_JUMP26:
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case R_AARCH64_CALL26:
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case R_AARCH64_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_AARCH64_PREL32:
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case R_AARCH64_MOVW_UABS_G0_NC:
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case R_AARCH64_MOVW_UABS_G1_NC:
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case R_AARCH64_MOVW_UABS_G2_NC:
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case R_AARCH64_MOVW_UABS_G3:
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case R_AARCH64_ADR_PREL_PG_HI21:
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case R_AARCH64_ADD_ABS_LO12_NC:
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case R_AARCH64_LDST64_ABS_LO12_NC:
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case R_AARCH64_GLOB_DAT:
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case R_AARCH64_JUMP_SLOT:
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case R_AARCH64_COPY:
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return NO_GOTPLT_ENTRY;
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case R_AARCH64_ABS32:
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case R_AARCH64_ABS64:
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case R_AARCH64_JUMP26:
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case R_AARCH64_CALL26:
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return AUTO_GOTPLT_ENTRY;
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case R_AARCH64_ADR_GOT_PAGE:
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case R_AARCH64_LD64_GOT_LO12_NC:
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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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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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unsigned plt_offset;
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if (plt->data_offset == 0) {
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section_ptr_add(plt, 32);
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}
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plt_offset = plt->data_offset;
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p = section_ptr_add(plt, 16);
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write32le(p, got_offset);
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write32le(p + 4, (uint64_t) got_offset >> 32);
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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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uint64_t plt = s1->plt->sh_addr;
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uint64_t got = s1->got->sh_addr + 16;
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uint64_t off = (got >> 12) - (plt >> 12);
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if ((off + ((uint32_t)1 << 20)) >> 21)
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tcc_error("Failed relocating PLT (off=0x%lx, got=0x%lx, plt=0x%lx)", (long)off, (long)got, (long)plt);
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write32le(p, 0xa9bf7bf0); // stp x16,x30,[sp,#-16]!
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write32le(p + 4, (0x90000010 | // adrp x16,...
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(off & 0x1ffffc) << 3 | (off & 3) << 29));
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write32le(p + 8, (0xf9400211 | // ldr x17,[x16,#...]
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(got & 0xff8) << 7));
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write32le(p + 12, (0x91000210 | // add x16,x16,#...
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(got & 0xfff) << 10));
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write32le(p + 16, 0xd61f0220); // br x17
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write32le(p + 20, 0xd503201f); // nop
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write32le(p + 24, 0xd503201f); // nop
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write32le(p + 28, 0xd503201f); // nop
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p += 32;
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got = s1->got->sh_addr;
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while (p < p_end) {
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uint64_t pc = plt + (p - s1->plt->data);
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uint64_t addr = got + read64le(p);
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uint64_t off = (addr >> 12) - (pc >> 12);
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if ((off + ((uint32_t)1 << 20)) >> 21)
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tcc_error("Failed relocating PLT (off=0x%lx, addr=0x%lx, pc=0x%lx)", (long)off, (long)addr, (long)pc);
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write32le(p, (0x90000010 | // adrp x16,...
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(off & 0x1ffffc) << 3 | (off & 3) << 29));
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write32le(p + 4, (0xf9400211 | // ldr x17,[x16,#...]
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(addr & 0xff8) << 7));
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write32le(p + 8, (0x91000210 | // add x16,x16,#...
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(addr & 0xfff) << 10));
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write32le(p + 12, 0xd61f0220); // br x17
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p += 16;
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}
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}
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if (s1->got->relocplt) {
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int mem = s1->output_type == TCC_OUTPUT_MEMORY;
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ElfW_Rel *rel;
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p = s1->got->data;
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for_each_elem(s1->got->relocplt, 0, rel, ElfW_Rel) {
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int sym_index = ELFW(R_SYM)(rel->r_info);
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ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
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write64le(p + rel->r_offset, mem ? sym->st_value : s1->plt->sh_addr);
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}
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}
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}
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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 = ELFW(R_SYM)(rel->r_info), esym_index;
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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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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_AARCH64_ABS64);
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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_AARCH64_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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return;
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case R_AARCH64_ABS32:
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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_AARCH64_RELATIVE 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_AARCH64_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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return;
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case R_AARCH64_PREL32:
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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_AARCH64_PREL32);
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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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write32le(ptr, val - addr);
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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_LDST64_ABS_LO12_NC:
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write32le(ptr, ((read32le(ptr) & 0xffc003ff) |
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(val & 0xff8) << 7));
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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)", (long)val, (long)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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get_sym_attr(s1, sym_index, 0)->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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get_sym_attr(s1, sym_index, 0)->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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case R_AARCH64_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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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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