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