| /* dl_helper.c - relocation helper functions for modules and grub-mkimage */ |
| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 2013 Free Software Foundation, Inc. |
| * |
| * GRUB is free software: you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation, either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * GRUB is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GRUB. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <grub/dl.h> |
| #include <grub/elf.h> |
| #include <grub/misc.h> |
| #include <grub/err.h> |
| #include <grub/mm.h> |
| #include <grub/i18n.h> |
| #include <grub/arm64/reloc.h> |
| |
| /* |
| * grub_arm64_reloc_xxxx26(): |
| * |
| * JUMP26/CALL26 relocations for B and BL instructions. |
| */ |
| |
| int |
| grub_arm_64_check_xxxx26_offset (grub_int64_t offset) |
| { |
| const grub_ssize_t offset_low = -(1 << 27), offset_high = (1 << 27) - 1; |
| |
| if ((offset < offset_low) || (offset > offset_high)) |
| return 0; |
| return 1; |
| } |
| |
| void |
| grub_arm64_set_xxxx26_offset (grub_uint32_t *place, grub_int64_t offset) |
| { |
| const grub_uint32_t insmask = grub_cpu_to_le32_compile_time (0xfc000000); |
| |
| grub_dprintf ("dl", " reloc_xxxx64 %p %c= 0x%llx\n", |
| place, offset > 0 ? '+' : '-', |
| offset < 0 ? (long long) -(unsigned long long) offset : offset); |
| |
| *place &= insmask; |
| *place |= grub_cpu_to_le32 (offset >> 2) & ~insmask; |
| } |
| |
| int |
| grub_arm64_check_hi21_signed (grub_int64_t offset) |
| { |
| if (offset != (grub_int64_t)(grub_int32_t)offset) |
| return 0; |
| return 1; |
| } |
| |
| void |
| grub_arm64_set_hi21 (grub_uint32_t *place, grub_int64_t offset) |
| { |
| const grub_uint32_t insmask = grub_cpu_to_le32_compile_time (0x9f00001f); |
| grub_uint32_t val; |
| |
| offset >>= 12; |
| |
| val = ((offset & 3) << 29) | (((offset >> 2) & 0x7ffff) << 5); |
| |
| *place &= insmask; |
| *place |= grub_cpu_to_le32 (val) & ~insmask; |
| } |
| |
| void |
| grub_arm64_set_abs_lo12 (grub_uint32_t *place, grub_int64_t target) |
| { |
| const grub_uint32_t insmask = grub_cpu_to_le32_compile_time (0xffc003ff); |
| |
| *place &= insmask; |
| *place |= grub_cpu_to_le32 (target << 10) & ~insmask; |
| } |
| |
| void |
| grub_arm64_set_abs_lo12_ldst64 (grub_uint32_t *place, grub_int64_t target) |
| { |
| const grub_uint32_t insmask = grub_cpu_to_le32_compile_time (0xfff803ff); |
| |
| *place &= insmask; |
| *place |= grub_cpu_to_le32 (target << 7) & ~insmask; |
| } |
| |
| #pragma GCC diagnostic ignored "-Wcast-align" |
| |
| grub_err_t |
| grub_arm64_dl_get_tramp_got_size (const void *ehdr, grub_size_t *tramp, |
| grub_size_t *got) |
| { |
| const Elf64_Ehdr *e = ehdr; |
| const Elf64_Shdr *s; |
| unsigned i; |
| |
| *tramp = 0; |
| *got = 0; |
| |
| for (i = 0, s = (Elf64_Shdr *) ((char *) e + grub_le_to_cpu64 (e->e_shoff)); |
| i < grub_le_to_cpu16 (e->e_shnum); |
| i++, s = (Elf64_Shdr *) ((char *) s + grub_le_to_cpu16 (e->e_shentsize))) |
| if (s->sh_type == grub_cpu_to_le32_compile_time (SHT_REL) |
| || s->sh_type == grub_cpu_to_le32_compile_time (SHT_RELA)) |
| { |
| const Elf64_Rela *rel, *max; |
| |
| for (rel = (Elf64_Rela *) ((char *) e + grub_le_to_cpu64 (s->sh_offset)), |
| max = (const Elf64_Rela *) ((char *) rel + grub_le_to_cpu64 (s->sh_size)); |
| rel < max; rel = (const Elf64_Rela *) ((char *) rel + grub_le_to_cpu64 (s->sh_entsize))) |
| switch (ELF64_R_TYPE (rel->r_info)) |
| { |
| case R_AARCH64_CALL26: |
| case R_AARCH64_JUMP26: |
| *tramp += sizeof (struct grub_arm64_trampoline); |
| break; |
| case R_AARCH64_ADR_GOT_PAGE: |
| *got += 8; |
| break; |
| } |
| } |
| |
| return GRUB_ERR_NONE; |
| } |