71 lines
2.0 KiB
C
71 lines
2.0 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/cpu/reloc.h>
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static grub_ssize_t
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sign_compress_offset (grub_ssize_t offset, int bitpos)
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{
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return offset & ((1LL << (bitpos + 1)) - 1);
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}
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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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grub_err_t
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grub_arm64_reloc_xxxx26 (grub_uint32_t *place, Elf64_Addr adjust)
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{
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grub_uint32_t insword, insmask;
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grub_ssize_t offset;
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const grub_ssize_t offset_low = -(1 << 27), offset_high = (1 << 27) - 1;
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insword = grub_le_to_cpu32 (*place);
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insmask = 0xfc000000;
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offset = adjust;
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#ifndef GRUB_UTIL
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offset -= (grub_addr_t) place;
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#endif
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if ((offset < offset_low) || (offset > offset_high))
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{
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return grub_error (GRUB_ERR_BAD_MODULE,
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N_("CALL26 Relocation out of range"));
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}
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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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offset = sign_compress_offset (offset, 27) >> 2;
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*place = grub_cpu_to_le32 ((insword & insmask) | offset);
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return GRUB_ERR_NONE;
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}
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