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Diffstat (limited to 'tinyc/arm64-link.c')
| -rw-r--r-- | tinyc/arm64-link.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/tinyc/arm64-link.c b/tinyc/arm64-link.c new file mode 100644 index 000000000..73e503e6b --- /dev/null +++ b/tinyc/arm64-link.c @@ -0,0 +1,250 @@ +#ifdef TARGET_DEFS_ONLY + +#define EM_TCC_TARGET EM_AARCH64 + +#define R_DATA_32 R_AARCH64_ABS32 +#define R_DATA_PTR R_AARCH64_ABS64 +#define R_JMP_SLOT R_AARCH64_JUMP_SLOT +#define R_GLOB_DAT R_AARCH64_GLOB_DAT +#define R_COPY R_AARCH64_COPY +#define R_RELATIVE R_AARCH64_RELATIVE + +#define R_NUM R_AARCH64_NUM + +#define ELF_START_ADDR 0x00400000 +#define ELF_PAGE_SIZE 0x1000 + +#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_AARCH64_ABS32: + case R_AARCH64_ABS64: + case R_AARCH64_PREL32: + case R_AARCH64_MOVW_UABS_G0_NC: + case R_AARCH64_MOVW_UABS_G1_NC: + case R_AARCH64_MOVW_UABS_G2_NC: + case R_AARCH64_MOVW_UABS_G3: + case R_AARCH64_ADR_PREL_PG_HI21: + case R_AARCH64_ADD_ABS_LO12_NC: + case R_AARCH64_ADR_GOT_PAGE: + case R_AARCH64_LD64_GOT_LO12_NC: + case R_AARCH64_GLOB_DAT: + case R_AARCH64_COPY: + return 0; + + case R_AARCH64_JUMP26: + case R_AARCH64_CALL26: + case R_AARCH64_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_AARCH64_PREL32: + case R_AARCH64_MOVW_UABS_G0_NC: + case R_AARCH64_MOVW_UABS_G1_NC: + case R_AARCH64_MOVW_UABS_G2_NC: + case R_AARCH64_MOVW_UABS_G3: + case R_AARCH64_ADR_PREL_PG_HI21: + case R_AARCH64_ADD_ABS_LO12_NC: + case R_AARCH64_GLOB_DAT: + case R_AARCH64_JUMP_SLOT: + case R_AARCH64_COPY: + return NO_GOTPLT_ENTRY; + + case R_AARCH64_ABS32: + case R_AARCH64_ABS64: + case R_AARCH64_JUMP26: + case R_AARCH64_CALL26: + return AUTO_GOTPLT_ENTRY; + + case R_AARCH64_ADR_GOT_PAGE: + case R_AARCH64_LD64_GOT_LO12_NC: + 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; + unsigned plt_offset; + + if (s1->output_type == TCC_OUTPUT_DLL) + tcc_error("DLLs unimplemented!"); + + if (plt->data_offset == 0) { + section_ptr_add(plt, 32); + } + plt_offset = plt->data_offset; + + p = section_ptr_add(plt, 16); + write32le(p, got_offset); + write32le(p + 4, (uint64_t) got_offset >> 32); + 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) { + uint64_t plt = s1->plt->sh_addr; + uint64_t got = s1->got->sh_addr; + uint64_t off = (got >> 12) - (plt >> 12); + if ((off + ((uint32_t)1 << 20)) >> 21) + tcc_error("Failed relocating PLT (off=0x%lx, got=0x%lx, plt=0x%lx)", off, got, plt); + write32le(p, 0xa9bf7bf0); // stp x16,x30,[sp,#-16]! + write32le(p + 4, (0x90000010 | // adrp x16,... + (off & 0x1ffffc) << 3 | (off & 3) << 29)); + write32le(p + 8, (0xf9400211 | // ldr x17,[x16,#...] + (got & 0xff8) << 7)); + write32le(p + 12, (0x91000210 | // add x16,x16,#... + (got & 0xfff) << 10)); + write32le(p + 16, 0xd61f0220); // br x17 + write32le(p + 20, 0xd503201f); // nop + write32le(p + 24, 0xd503201f); // nop + write32le(p + 28, 0xd503201f); // nop + p += 32; + while (p < p_end) { + uint64_t pc = plt + (p - s1->plt->data); + uint64_t addr = got + read64le(p); + uint64_t off = (addr >> 12) - (pc >> 12); + if ((off + ((uint32_t)1 << 20)) >> 21) + tcc_error("Failed relocating PLT (off=0x%lx, addr=0x%lx, pc=0x%lx)", off, addr, pc); + write32le(p, (0x90000010 | // adrp x16,... + (off & 0x1ffffc) << 3 | (off & 3) << 29)); + write32le(p + 4, (0xf9400211 | // ldr x17,[x16,#...] + (addr & 0xff8) << 7)); + write32le(p + 8, (0x91000210 | // add x16,x16,#... + (addr & 0xfff) << 10)); + write32le(p + 12, 0xd61f0220); // br x17 + p += 16; + } + } +} + +void relocate_init(Section *sr) {} + +void relocate(TCCState *s1, ElfW_Rel *rel, int type, unsigned char *ptr, addr_t addr, addr_t val) +{ + int sym_index = ELFW(R_SYM)(rel->r_info); +#ifdef DEBUG_RELOC + ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; +#endif + + switch(type) { + case R_AARCH64_ABS64: + write64le(ptr, val); + return; + case R_AARCH64_ABS32: + write32le(ptr, val); + return; + case R_AARCH64_PREL32: + write32le(ptr, val - addr); + return; + case R_AARCH64_MOVW_UABS_G0_NC: + write32le(ptr, ((read32le(ptr) & 0xffe0001f) | + (val & 0xffff) << 5)); + return; + case R_AARCH64_MOVW_UABS_G1_NC: + write32le(ptr, ((read32le(ptr) & 0xffe0001f) | + (val >> 16 & 0xffff) << 5)); + return; + case R_AARCH64_MOVW_UABS_G2_NC: + write32le(ptr, ((read32le(ptr) & 0xffe0001f) | + (val >> 32 & 0xffff) << 5)); + return; + case R_AARCH64_MOVW_UABS_G3: + write32le(ptr, ((read32le(ptr) & 0xffe0001f) | + (val >> 48 & 0xffff) << 5)); + return; + case R_AARCH64_ADR_PREL_PG_HI21: { + uint64_t off = (val >> 12) - (addr >> 12); + if ((off + ((uint64_t)1 << 20)) >> 21) + tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed"); + write32le(ptr, ((read32le(ptr) & 0x9f00001f) | + (off & 0x1ffffc) << 3 | (off & 3) << 29)); + return; + } + case R_AARCH64_ADD_ABS_LO12_NC: + write32le(ptr, ((read32le(ptr) & 0xffc003ff) | + (val & 0xfff) << 10)); + return; + case R_AARCH64_JUMP26: + case R_AARCH64_CALL26: +#ifdef DEBUG_RELOC + printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val, + (char *) symtab_section->link->data + sym->st_name); +#endif + if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc) + tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed" + " (val=%lx, addr=%lx)", val, addr); + write32le(ptr, (0x14000000 | + (uint32_t)(type == R_AARCH64_CALL26) << 31 | + ((val - addr) >> 2 & 0x3ffffff))); + return; + case R_AARCH64_ADR_GOT_PAGE: { + uint64_t off = + (((s1->got->sh_addr + + s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12)); + if ((off + ((uint64_t)1 << 20)) >> 21) + tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed"); + write32le(ptr, ((read32le(ptr) & 0x9f00001f) | + (off & 0x1ffffc) << 3 | (off & 3) << 29)); + return; + } + case R_AARCH64_LD64_GOT_LO12_NC: + write32le(ptr, + ((read32le(ptr) & 0xfff803ff) | + ((s1->got->sh_addr + + s1->sym_attrs[sym_index].got_offset) & 0xff8) << 7)); + return; + case R_AARCH64_COPY: + return; + case R_AARCH64_GLOB_DAT: + case R_AARCH64_JUMP_SLOT: + /* They don't need addend */ +#ifdef DEBUG_RELOC + printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, + val - rel->r_addend, + (char *) symtab_section->link->data + sym->st_name); +#endif + write64le(ptr, val - rel->r_addend); + return; + default: + fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n", + type, (unsigned)addr, ptr, (unsigned)val); + return; + } +} + +#endif /* !TARGET_DEFS_ONLY */ |