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