made relocator more portable
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phcoder
parent
8f2e29a2a3
commit
9ed5ff3f6f
2 changed files with 137 additions and 101 deletions
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@ -54,112 +54,51 @@ extern grub_uint32_t grub_relocator32_backward_esp;
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#define RELOCATOR_SIZEOF(x) (&grub_relocator32_##x##_end - &grub_relocator32_##x##_start)
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#define RELOCATOR_ALIGN 16
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#define PREFIX(x) grub_relocator32_ ## x
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void *
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grub_relocator32_alloc (grub_size_t size)
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static void
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write_relocator_bw (void *ptr, 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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char *playground;
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playground = grub_malloc ((RELOCATOR_SIZEOF (forward) + RELOCATOR_ALIGN)
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+ size
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+ (RELOCATOR_SIZEOF (backward) +
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RELOCATOR_ALIGN));
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if (!playground)
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return 0;
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*(grub_size_t *) playground = size;
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return playground + RELOCATOR_SIZEOF (forward);
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}
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void *
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grub_relocator32_realloc (void *relocator, grub_size_t size)
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{
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char *playground;
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playground = (char *) relocator - RELOCATOR_SIZEOF (forward);
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playground = grub_realloc (playground,
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(RELOCATOR_SIZEOF (forward) + RELOCATOR_ALIGN)
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+ size
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+ (RELOCATOR_SIZEOF (backward) + RELOCATOR_ALIGN));
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if (!playground)
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return 0;
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*(grub_size_t *) playground = size;
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return playground + RELOCATOR_SIZEOF (forward);
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}
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void
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grub_relocator32_free (void *relocator)
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{
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if (relocator)
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grub_free ((char *) relocator - RELOCATOR_SIZEOF (forward));
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}
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grub_err_t
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grub_relocator32_boot (void *relocator, grub_uint32_t dest,
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struct grub_relocator32_state state)
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{
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grub_size_t size;
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char *playground;
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void (*entry) ();
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playground = (char *) relocator - RELOCATOR_SIZEOF (forward);
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size = *(grub_size_t *) playground;
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grub_relocator32_backward_dest = dest;
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grub_relocator32_backward_src = PTR_TO_UINT64 (src);
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grub_relocator32_backward_size = size;
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if (UINT_TO_PTR (dest) >= relocator)
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{
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int overhead;
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grub_relocator32_backward_eax = state.eax;
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grub_relocator32_backward_ebx = state.ebx;
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grub_relocator32_backward_ecx = state.ecx;
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grub_relocator32_backward_edx = state.edx;
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grub_relocator32_backward_eip = state.eip;
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grub_relocator32_backward_esp = state.esp;
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overhead =
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ALIGN_UP (dest - RELOCATOR_SIZEOF (backward) - RELOCATOR_ALIGN,
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RELOCATOR_ALIGN);
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grub_relocator32_backward_dest = dest - overhead;
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grub_relocator32_backward_src = PTR_TO_UINT64 (relocator - overhead);
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grub_relocator32_backward_size = size + overhead;
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grub_relocator32_backward_eax = state.eax;
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grub_relocator32_backward_ebx = state.ebx;
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grub_relocator32_backward_ecx = state.ecx;
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grub_relocator32_backward_edx = state.edx;
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grub_relocator32_backward_eip = state.eip;
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grub_relocator32_backward_esp = state.esp;
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grub_memmove (relocator - overhead,
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&grub_relocator32_backward_start,
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RELOCATOR_SIZEOF (backward));
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entry = (void (*)()) (relocator - overhead);
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}
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else
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{
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int overhead;
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overhead = ALIGN_UP (dest + size, RELOCATOR_ALIGN)
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+ RELOCATOR_SIZEOF (forward) - (dest + size);
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grub_relocator32_forward_dest = dest;
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grub_relocator32_forward_src = PTR_TO_UINT64 (relocator);
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grub_relocator32_forward_size = size + overhead;
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grub_relocator32_forward_eax = state.eax;
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grub_relocator32_forward_ebx = state.ebx;
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grub_relocator32_forward_ecx = state.ecx;
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grub_relocator32_forward_edx = state.edx;
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grub_relocator32_forward_eip = state.eip;
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grub_relocator32_forward_esp = state.esp;
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grub_memmove (relocator + size + overhead - RELOCATOR_SIZEOF (forward),
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&grub_relocator32_forward_start,
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RELOCATOR_SIZEOF (forward));
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entry =
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(void (*)()) (relocator + size + overhead -
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RELOCATOR_SIZEOF (forward));
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}
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grub_memmove (ptr,
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&grub_relocator32_backward_start,
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RELOCATOR_SIZEOF (backward));
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entry = (void (*)()) (ptr);
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entry ();
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}
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static void
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write_relocator_bw (void *ptr, 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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grub_relocator32_forward_dest = dest;
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grub_relocator32_forward_src = PTR_TO_UINT64 (src);
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grub_relocator32_forward_size = size;
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grub_relocator32_forward_eax = state.eax;
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grub_relocator32_forward_ebx = state.ebx;
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grub_relocator32_forward_ecx = state.ecx;
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grub_relocator32_forward_edx = state.edx;
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grub_relocator32_forward_eip = state.eip;
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grub_relocator32_forward_esp = state.esp;
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grub_memmove (ptr,
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&grub_relocator32_forward_start,
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RELOCATOR_SIZEOF (forward));
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entry = (void (*)()) ptr;
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entry ();
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/* Not reached. */
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return GRUB_ERR_NONE;
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}
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97
lib/relocator.c
Normal file
97
lib/relocator.c
Normal file
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@ -0,0 +1,97 @@
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/*
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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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void *
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PREFIX (alloc) (grub_size_t size)
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{
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char *playground;
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playground = grub_malloc ((RELOCATOR_SIZEOF (forward) + RELOCATOR_ALIGN)
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+ size
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+ (RELOCATOR_SIZEOF (backward) +
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RELOCATOR_ALIGN));
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if (!playground)
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return 0;
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*(grub_size_t *) playground = size;
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return playground + RELOCATOR_SIZEOF (forward);
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}
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void *
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PREFIX (realloc) (void *relocator, grub_size_t size)
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{
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char *playground;
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playground = (char *) relocator - RELOCATOR_SIZEOF (forward);
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playground = grub_realloc (playground,
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(RELOCATOR_SIZEOF (forward) + RELOCATOR_ALIGN)
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+ size
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+ (RELOCATOR_SIZEOF (backward) + RELOCATOR_ALIGN));
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if (!playground)
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return 0;
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*(grub_size_t *) playground = size;
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return playground + RELOCATOR_SIZEOF (forward);
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}
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void
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PREFIX(free) (void *relocator)
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{
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if (relocator)
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grub_free ((char *) relocator - RELOCATOR_SIZEOF (forward));
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}
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grub_err_t
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PREFIX (boot) (void *relocator, grub_uint32_t dest,
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struct grub_relocator32_state state)
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{
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grub_size_t size;
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char *playground;
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playground = (char *) relocator - RELOCATOR_SIZEOF (forward);
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size = *(grub_size_t *) playground;
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if (UINT_TO_PTR (dest) >= relocator)
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{
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int overhead;
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void *reldest = relocator - overhead;
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overhead =
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ALIGN_UP (dest - RELOCATOR_SIZEOF (backward) - RELOCATOR_ALIGN,
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RELOCATOR_ALIGN);
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write_call_relocator_bw (relocator - overhead,
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relocator - overhead,
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dest - overhead, size + overhead, state);
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}
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else
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{
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int overhead;
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overhead = ALIGN_UP (dest + size, RELOCATOR_ALIGN)
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+ RELOCATOR_SIZEOF (forward) - (dest + size);
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write_call_relocator_fw (relocator + size + overhead
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- RELOCATOR_SIZEOF (forward),
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relocator, dest, size + overhead, state);
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}
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/* Not reached. */
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return GRUB_ERR_NONE;
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}
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