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made relocator more portable

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phcoder 2009-10-11 22:20:55 +02:00
parent 8f2e29a2a3
commit 9ed5ff3f6f
2 changed files with 137 additions and 101 deletions
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97
lib/i386/relocator.c
View file

@ -54,72 +54,17 @@ extern grub_uint32_t grub_relocator32_backward_esp;
#define RELOCATOR_SIZEOF(x) (&grub_relocator32_##x##_end - &grub_relocator32_##x##_start)
#define RELOCATOR_ALIGN 16
#define PREFIX(x) grub_relocator32_ ## x
void *
grub_relocator32_alloc (grub_size_t size)
static void
write_relocator_bw (void *ptr, void *src, grub_uint32_t dest,
grub_size_t size, struct grub_relocator32_state state)
{
char *playground;
playground = grub_malloc ((RELOCATOR_SIZEOF (forward) + RELOCATOR_ALIGN)
+ size
+ (RELOCATOR_SIZEOF (backward) +
RELOCATOR_ALIGN));
if (!playground)
return 0;
*(grub_size_t *) playground = size;
return playground + RELOCATOR_SIZEOF (forward);
}
void *
grub_relocator32_realloc (void *relocator, grub_size_t size)
{
char *playground;
playground = (char *) relocator - RELOCATOR_SIZEOF (forward);
playground = grub_realloc (playground,
(RELOCATOR_SIZEOF (forward) + RELOCATOR_ALIGN)
+ size
+ (RELOCATOR_SIZEOF (backward) + RELOCATOR_ALIGN));
if (!playground)
return 0;
*(grub_size_t *) playground = size;
return playground + RELOCATOR_SIZEOF (forward);
}
void
grub_relocator32_free (void *relocator)
{
if (relocator)
grub_free ((char *) relocator - RELOCATOR_SIZEOF (forward));
}
grub_err_t
grub_relocator32_boot (void *relocator, grub_uint32_t dest,
struct grub_relocator32_state state)
{
grub_size_t size;
char *playground;
void (*entry) ();
playground = (char *) relocator - RELOCATOR_SIZEOF (forward);
size = *(grub_size_t *) playground;
if (UINT_TO_PTR (dest) >= relocator)
{
int overhead;
overhead =
ALIGN_UP (dest - RELOCATOR_SIZEOF (backward) - RELOCATOR_ALIGN,
RELOCATOR_ALIGN);
grub_relocator32_backward_dest = dest - overhead;
grub_relocator32_backward_src = PTR_TO_UINT64 (relocator - overhead);
grub_relocator32_backward_size = size + overhead;
grub_relocator32_backward_dest = dest;
grub_relocator32_backward_src = PTR_TO_UINT64 (src);
grub_relocator32_backward_size = size;
grub_relocator32_backward_eax = state.eax;
grub_relocator32_backward_ebx = state.ebx;
@ -128,21 +73,21 @@ grub_relocator32_boot (void *relocator, grub_uint32_t dest,
grub_relocator32_backward_eip = state.eip;
grub_relocator32_backward_esp = state.esp;
grub_memmove (relocator - overhead,
grub_memmove (ptr,
&grub_relocator32_backward_start,
RELOCATOR_SIZEOF (backward));
entry = (void (*)()) (relocator - overhead);
entry = (void (*)()) (ptr);
entry ();
}
else
{
int overhead;
overhead = ALIGN_UP (dest + size, RELOCATOR_ALIGN)
+ RELOCATOR_SIZEOF (forward) - (dest + size);
static void
write_relocator_bw (void *ptr, void *src, grub_uint32_t dest,
grub_size_t size, struct grub_relocator32_state state)
{
grub_relocator32_forward_dest = dest;
grub_relocator32_forward_src = PTR_TO_UINT64 (relocator);
grub_relocator32_forward_size = size + overhead;
grub_relocator32_forward_src = PTR_TO_UINT64 (src);
grub_relocator32_forward_size = size;
grub_relocator32_forward_eax = state.eax;
grub_relocator32_forward_ebx = state.ebx;
@ -151,15 +96,9 @@ grub_relocator32_boot (void *relocator, grub_uint32_t dest,
grub_relocator32_forward_eip = state.eip;
grub_relocator32_forward_esp = state.esp;
grub_memmove (relocator + size + overhead - RELOCATOR_SIZEOF (forward),
grub_memmove (ptr,
&grub_relocator32_forward_start,
RELOCATOR_SIZEOF (forward));
entry =
(void (*)()) (relocator + size + overhead -
RELOCATOR_SIZEOF (forward));
}
entry = (void (*)()) ptr;
entry ();
/* Not reached. */
return GRUB_ERR_NONE;
}

97
lib/relocator.c Normal file
View file

@ -0,0 +1,97 @@
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 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/>.
*/
void *
PREFIX (alloc) (grub_size_t size)
{
char *playground;
playground = grub_malloc ((RELOCATOR_SIZEOF (forward) + RELOCATOR_ALIGN)
+ size
+ (RELOCATOR_SIZEOF (backward) +
RELOCATOR_ALIGN));
if (!playground)
return 0;
*(grub_size_t *) playground = size;
return playground + RELOCATOR_SIZEOF (forward);
}
void *
PREFIX (realloc) (void *relocator, grub_size_t size)
{
char *playground;
playground = (char *) relocator - RELOCATOR_SIZEOF (forward);
playground = grub_realloc (playground,
(RELOCATOR_SIZEOF (forward) + RELOCATOR_ALIGN)
+ size
+ (RELOCATOR_SIZEOF (backward) + RELOCATOR_ALIGN));
if (!playground)
return 0;
*(grub_size_t *) playground = size;
return playground + RELOCATOR_SIZEOF (forward);
}
void
PREFIX(free) (void *relocator)
{
if (relocator)
grub_free ((char *) relocator - RELOCATOR_SIZEOF (forward));
}
grub_err_t
PREFIX (boot) (void *relocator, grub_uint32_t dest,
struct grub_relocator32_state state)
{
grub_size_t size;
char *playground;
playground = (char *) relocator - RELOCATOR_SIZEOF (forward);
size = *(grub_size_t *) playground;
if (UINT_TO_PTR (dest) >= relocator)
{
int overhead;
void *reldest = relocator - overhead;
overhead =
ALIGN_UP (dest - RELOCATOR_SIZEOF (backward) - RELOCATOR_ALIGN,
RELOCATOR_ALIGN);
write_call_relocator_bw (relocator - overhead,
relocator - overhead,
dest - overhead, size + overhead, state);
}
else
{
int overhead;
overhead = ALIGN_UP (dest + size, RELOCATOR_ALIGN)
+ RELOCATOR_SIZEOF (forward) - (dest + size);
write_call_relocator_fw (relocator + size + overhead
- RELOCATOR_SIZEOF (forward),
relocator, dest, size + overhead, state);
}
/* Not reached. */
return GRUB_ERR_NONE;
}