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Diffstat (limited to '')
-rw-r--r-- | grub-core/lib/i386/relocator_common_c.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/grub-core/lib/i386/relocator_common_c.c b/grub-core/lib/i386/relocator_common_c.c new file mode 100644 index 0000000..7be609b --- /dev/null +++ b/grub-core/lib/i386/relocator_common_c.c @@ -0,0 +1,109 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2009-2013 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/mm.h> +#include <grub/misc.h> + +#include <grub/types.h> +#include <grub/err.h> +#include <grub/term.h> + +#include <grub/relocator.h> +#include <grub/relocator_private.h> + +extern grub_uint8_t grub_relocator_forward_start; +extern grub_uint8_t grub_relocator_forward_end; +extern grub_uint8_t grub_relocator_backward_start; +extern grub_uint8_t grub_relocator_backward_end; + +extern void *grub_relocator_backward_dest; +extern void *grub_relocator_backward_src; +extern grub_size_t grub_relocator_backward_chunk_size; + +extern void *grub_relocator_forward_dest; +extern void *grub_relocator_forward_src; +extern grub_size_t grub_relocator_forward_chunk_size; + +#define RELOCATOR_SIZEOF(x) (&grub_relocator##x##_end - &grub_relocator##x##_start) + +grub_size_t grub_relocator_align = 1; +grub_size_t grub_relocator_forward_size; +grub_size_t grub_relocator_backward_size; +#ifdef __x86_64__ +grub_size_t grub_relocator_jumper_size = 12; +#else +grub_size_t grub_relocator_jumper_size = 7; +#endif + +void +grub_cpu_relocator_init (void) +{ + grub_relocator_forward_size = RELOCATOR_SIZEOF (_forward); + grub_relocator_backward_size = RELOCATOR_SIZEOF (_backward); +} + +void +grub_cpu_relocator_jumper (void *rels, grub_addr_t addr) +{ + grub_uint8_t *ptr; + ptr = rels; +#ifdef __x86_64__ + /* movq imm64, %rax (for relocator) */ + *(grub_uint8_t *) ptr = 0x48; + ptr++; + *(grub_uint8_t *) ptr = 0xb8; + ptr++; + *(grub_uint64_t *) ptr = addr; + ptr += sizeof (grub_uint64_t); +#else + /* movl imm32, %eax (for relocator) */ + *(grub_uint8_t *) ptr = 0xb8; + ptr++; + *(grub_uint32_t *) ptr = addr; + ptr += sizeof (grub_uint32_t); +#endif + /* jmp $eax/$rax */ + *(grub_uint8_t *) ptr = 0xff; + ptr++; + *(grub_uint8_t *) ptr = 0xe0; + ptr++; +} + +void +grub_cpu_relocator_backward (void *ptr, void *src, void *dest, + grub_size_t size) +{ + grub_relocator_backward_dest = dest; + grub_relocator_backward_src = src; + grub_relocator_backward_chunk_size = size; + + grub_memmove (ptr, + &grub_relocator_backward_start, RELOCATOR_SIZEOF (_backward)); +} + +void +grub_cpu_relocator_forward (void *ptr, void *src, void *dest, + grub_size_t size) +{ + grub_relocator_forward_dest = dest; + grub_relocator_forward_src = src; + grub_relocator_forward_chunk_size = size; + + grub_memmove (ptr, + &grub_relocator_forward_start, RELOCATOR_SIZEOF (_forward)); +} |