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133 lines
3.0 KiB
C
133 lines
3.0 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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/**
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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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Returns whether the Relocation shall be preserved.
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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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MachoPreserveRelocation (
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IN UINT8 Type
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)
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{
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return MachoPreserveRelocationIntel64 (Type);
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}
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/**
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Retrieves a Relocation by the address it targets.
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@param[in] NumberOfRelocations Number of Relocations in Relocations.
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@param[in] Relocations The Relocations to search.
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@param[in] Address The address to search for.
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@param[in] MachCpuType CPU Type of the MACH-O.
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@retval NULL NULL is returned on failure.
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**/
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CONST MACH_RELOCATION_INFO *
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MachoGetRelocationByOffset (
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IN UINTN NumberOfRelocations,
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IN CONST MACH_RELOCATION_INFO *Relocations,
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IN UINT64 Address,
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IN MACH_CPU_TYPE MachCpuType
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)
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{
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UINTN Index;
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CONST MACH_RELOCATION_INFO *Relocation;
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ASSERT (Relocations != NULL);
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for (
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Index = 0, Relocation = &Relocations[0];
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Index < NumberOfRelocations;
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++Index, ++Relocation
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) {
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//
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// A section-based relocation entry can be skipped for absolute
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// symbols.
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//
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if ((((UINT32)Relocation->Address & MACH_RELOC_SCATTERED) == 0)
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&& (Relocation->Extern == 0)
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&& (Relocation->Address == 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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//
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if ((MachCpuType == MachCpuTypeX8664)
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&& MachoRelocationIsPairIntel64 (Relocation->Type)) {
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++Index;
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++Relocation;
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}
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}
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return NULL;
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}
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