diff options
Diffstat (limited to 'grub-core/kern/arm64/dl_helper.c')
| -rw-r--r-- | grub-core/kern/arm64/dl_helper.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/grub-core/kern/arm64/dl_helper.c b/grub-core/kern/arm64/dl_helper.c new file mode 100644 index 0000000..e00c198 --- /dev/null +++ b/grub-core/kern/arm64/dl_helper.c @@ -0,0 +1,134 @@ +/* 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; +} |