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/* 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;
}
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