mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-17 15:18:06 +01:00
159 lines
3.6 KiB
C
159 lines
3.6 KiB
C
/** @file
|
|
Provides services for Relocations.
|
|
|
|
Copyright (c) 2018, Download-Fritz. All rights reserved.<BR>
|
|
This program and the accompanying materials are licensed and made available
|
|
under the terms and conditions of the BSD License which accompanies this
|
|
distribution. The full text of the license may be found at
|
|
http://opensource.org/licenses/bsd-license.php.
|
|
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
|
|
**/
|
|
|
|
#include <Base.h>
|
|
|
|
#include <IndustryStandard/AppleMachoImage.h>
|
|
|
|
#include <Library/DebugLib.h>
|
|
#include <Library/MachoLib.h>
|
|
|
|
#include "MachoLibInternal.h"
|
|
|
|
/**
|
|
Returns whether the Relocation's type indicates a Pair for the Intel 64
|
|
platform.
|
|
|
|
@param[in] Type The Relocation's type to verify.
|
|
|
|
**/
|
|
BOOLEAN
|
|
MachoRelocationIsPairIntel64 (
|
|
IN UINT8 Type
|
|
)
|
|
{
|
|
return (Type == MachX8664RelocSubtractor);
|
|
}
|
|
|
|
/**
|
|
Returns whether the Relocation's type matches a Pair's for the Intel 64
|
|
platform.
|
|
|
|
@param[in] Type The Relocation's type to verify.
|
|
|
|
**/
|
|
BOOLEAN
|
|
MachoIsRelocationPairTypeIntel64 (
|
|
IN UINT8 Type
|
|
)
|
|
{
|
|
return (Type == MachX8664RelocUnsigned);
|
|
}
|
|
|
|
/**
|
|
Returns whether the Relocation shall be preserved for the Intel 64 platform.
|
|
|
|
@param[in] Type The Relocation's type to verify.
|
|
|
|
**/
|
|
BOOLEAN
|
|
MachoPreserveRelocationIntel64 (
|
|
IN UINT8 Type
|
|
)
|
|
{
|
|
return (Type == MachX8664RelocUnsigned);
|
|
}
|
|
|
|
/**
|
|
Retrieves an extern Relocation by the address it targets.
|
|
|
|
@param[in] Address The address to search for.
|
|
|
|
@retval NULL NULL is returned on failure.
|
|
|
|
**/
|
|
STATIC
|
|
MACH_RELOCATION_INFO *
|
|
InternalLookupRelocationByOffset (
|
|
IN UINT64 Address,
|
|
IN UINT32 NumRelocs,
|
|
IN MACH_RELOCATION_INFO *Relocs
|
|
)
|
|
{
|
|
UINT32 Index;
|
|
MACH_RELOCATION_INFO *Relocation;
|
|
|
|
for (Index = 0; Index < NumRelocs; ++Index) {
|
|
Relocation = &Relocs[Index];
|
|
//
|
|
// A section-based relocation entry can be skipped for absolute symbols.
|
|
//
|
|
if ((Relocation->Extern == 0)
|
|
&& (Relocation->SymbolNumber == MACH_RELOC_ABSOLUTE)) {
|
|
continue;
|
|
}
|
|
|
|
if ((UINT64)Relocation->Address == Address) {
|
|
return Relocation;
|
|
}
|
|
//
|
|
// Relocation Pairs can be skipped.
|
|
// Assumption: Intel X64. Currently verified by the Context
|
|
// initialization.
|
|
//
|
|
if (MachoRelocationIsPairIntel64 ((UINT8)Relocation->Type)) {
|
|
if (Index == (MAX_UINT32 - 1)) {
|
|
break;
|
|
}
|
|
++Index;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
Retrieves an extern Relocation by the address it targets.
|
|
|
|
@param[in,out] Context Context of the Mach-O.
|
|
@param[in] Address The address to search for.
|
|
|
|
@retval NULL NULL is returned on failure.
|
|
|
|
**/
|
|
MACH_RELOCATION_INFO *
|
|
InternalGetExternRelocationByOffset (
|
|
IN OUT OC_MACHO_CONTEXT *Context,
|
|
IN UINT64 Address
|
|
)
|
|
{
|
|
return InternalLookupRelocationByOffset (
|
|
Address,
|
|
Context->DySymtab->NumExternalRelocations,
|
|
Context->ExternRelocations
|
|
);
|
|
}
|
|
|
|
/**
|
|
Retrieves an extern Relocation by the address it targets.
|
|
|
|
@param[in,out] Context Context of the Mach-O.
|
|
@param[in] Address The address to search for.
|
|
|
|
@retval NULL NULL is returned on failure.
|
|
|
|
**/
|
|
MACH_RELOCATION_INFO *
|
|
InternalGetLocalRelocationByOffset (
|
|
IN OUT OC_MACHO_CONTEXT *Context,
|
|
IN UINT64 Address
|
|
)
|
|
{
|
|
return InternalLookupRelocationByOffset (
|
|
Address,
|
|
Context->DySymtab->NumOfLocalRelocations,
|
|
Context->LocalRelocations
|
|
);
|
|
}
|