113 lines
3.6 KiB
C
113 lines
3.6 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 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/mm.h>
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#include <grub/misc.h>
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#include <grub/types.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/cache.h>
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#include <grub/mips/relocator.h>
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/* Remark: doesn't work with source outside of 4G.
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Use relocator64 in this case.
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*/
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extern grub_uint8_t grub_relocator32_forward_start;
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extern grub_uint8_t grub_relocator32_forward_end;
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extern grub_uint8_t grub_relocator32_backward_start;
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extern grub_uint8_t grub_relocator32_backward_end;
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#define REGW_SIZEOF (2 * sizeof (grub_uint32_t))
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#define JUMP_SIZEOF (2 * sizeof (grub_uint32_t))
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#define RELOCATOR_SRC_SIZEOF(x) (&grub_relocator32_##x##_end \
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- &grub_relocator32_##x##_start)
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#define RELOCATOR_SIZEOF(x) (RELOCATOR_SRC_SIZEOF(x) \
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+ REGW_SIZEOF * (31 + 3) + JUMP_SIZEOF)
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#define RELOCATOR_ALIGN 16
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#define PREFIX(x) grub_relocator32_ ## x
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static void
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write_reg (int regn, grub_uint32_t val, void **target)
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{
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/* lui $r, (val+0x8000). */
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*(grub_uint32_t *) *target = ((0x3c00 | regn) << 16) | ((val + 0x8000) >> 16);
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*target = ((grub_uint32_t *) *target) + 1;
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/* addiu $r, $r, val. */
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*(grub_uint32_t *) *target = (((0x2400 | regn << 5 | regn) << 16)
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| (val & 0xffff));
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*target = ((grub_uint32_t *) *target) + 1;
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}
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static void
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write_jump (int regn, void **target)
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{
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/* j $r. */
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*(grub_uint32_t *) *target = (regn<<21) | 0x8;
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*target = ((grub_uint32_t *) *target) + 1;
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/* nop. */
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*(grub_uint32_t *) *target = 0;
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*target = ((grub_uint32_t *) *target) + 1;
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}
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static void
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write_call_relocator_bw (void *ptr0, void *src, grub_uint32_t dest,
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grub_size_t size, struct grub_relocator32_state state)
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{
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void *ptr = ptr0;
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int i;
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write_reg (8, (grub_uint32_t) src, &ptr);
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write_reg (9, dest, &ptr);
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write_reg (10, size, &ptr);
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grub_memcpy (ptr, &grub_relocator32_backward_start,
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RELOCATOR_SRC_SIZEOF (backward));
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ptr = (grub_uint8_t *) ptr + RELOCATOR_SRC_SIZEOF (backward);
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for (i = 1; i < 32; i++)
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write_reg (i, state.gpr[i], &ptr);
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write_jump (state.jumpreg, &ptr);
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grub_arch_sync_caches (ptr0, (grub_uint8_t *) ptr - (grub_uint8_t *) ptr0);
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grub_dprintf ("relocator", "Backward relocator: about to jump to %p\n", ptr0);
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((void (*) (void)) ptr0) ();
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}
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static void
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write_call_relocator_fw (void *ptr0, void *src, grub_uint32_t dest,
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grub_size_t size, struct grub_relocator32_state state)
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{
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void *ptr = ptr0;
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int i;
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write_reg (8, (grub_uint32_t) src, &ptr);
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write_reg (9, dest, &ptr);
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write_reg (10, size, &ptr);
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grub_memcpy (ptr, &grub_relocator32_forward_start,
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RELOCATOR_SRC_SIZEOF (forward));
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ptr = (grub_uint8_t *) ptr + RELOCATOR_SRC_SIZEOF (forward);
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for (i = 1; i < 32; i++)
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write_reg (i, state.gpr[i], &ptr);
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write_jump (state.jumpreg, &ptr);
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grub_arch_sync_caches (ptr0, (grub_uint8_t *) ptr - (grub_uint8_t *) ptr0);
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grub_dprintf ("relocator", "Forward relocator: about to jump to %p\n", ptr0);
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((void (*) (void)) ptr0) ();
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}
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#include "../relocator.c"
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