diff options
Diffstat (limited to 'Core/MdePkg/Library/BasePeCoffLib/Arm/PeCoffLoaderEx.c')
| -rw-r--r-- | Core/MdePkg/Library/BasePeCoffLib/Arm/PeCoffLoaderEx.c | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BasePeCoffLib/Arm/PeCoffLoaderEx.c b/Core/MdePkg/Library/BasePeCoffLib/Arm/PeCoffLoaderEx.c new file mode 100644 index 0000000000..d6bf42738d --- /dev/null +++ b/Core/MdePkg/Library/BasePeCoffLib/Arm/PeCoffLoaderEx.c @@ -0,0 +1,249 @@ +/** @file
+ Specific relocation fixups for ARM architecture.
+
+ Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
+ Portions copyright (c) 2008 - 2010, Apple Inc. 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 "BasePeCoffLibInternals.h"
+#include <Library/BaseLib.h>
+
+
+/**
+ Pass in a pointer to an ARM MOVT or MOVW immediate instruciton and
+ return the immediate data encoded in the instruction.
+
+ @param Instruction Pointer to ARM MOVT or MOVW immediate instruction
+
+ @return Immediate address encoded in the instruction
+
+**/
+UINT16
+ThumbMovtImmediateAddress (
+ IN UINT16 *Instruction
+ )
+{
+ UINT32 Movt;
+ UINT16 Address;
+
+ // Thumb2 is two 16-bit instructions working together. Not a single 32-bit instruction
+ // Example MOVT R0, #0 is 0x0000f2c0 or 0xf2c0 0x0000
+ Movt = (*Instruction << 16) | (*(Instruction + 1));
+
+ // imm16 = imm4:i:imm3:imm8
+ // imm4 -> Bit19:Bit16
+ // i -> Bit26
+ // imm3 -> Bit14:Bit12
+ // imm8 -> Bit7:Bit0
+ Address = (UINT16)(Movt & 0x000000ff); // imm8
+ Address |= (UINT16)((Movt >> 4) & 0x0000f700); // imm4 imm3
+ Address |= (((Movt & BIT26) != 0) ? BIT11 : 0); // i
+ return Address;
+}
+
+
+/**
+ Update an ARM MOVT or MOVW immediate instruction immediate data.
+
+ @param Instruction Pointer to ARM MOVT or MOVW immediate instruction
+ @param Address New addres to patch into the instruction
+**/
+VOID
+ThumbMovtImmediatePatch (
+ IN OUT UINT16 *Instruction,
+ IN UINT16 Address
+ )
+{
+ UINT16 Patch;
+
+ // First 16-bit chunk of instruciton
+ Patch = ((Address >> 12) & 0x000f); // imm4
+ Patch |= (((Address & BIT11) != 0) ? BIT10 : 0); // i
+ // Mask out instruction bits and or in address
+ *(Instruction) = (*Instruction & ~0x040f) | Patch;
+
+ // Second 16-bit chunk of instruction
+ Patch = Address & 0x000000ff; // imm8
+ Patch |= ((Address << 4) & 0x00007000); // imm3
+ // Mask out instruction bits and or in address
+ Instruction++;
+ *Instruction = (*Instruction & ~0x70ff) | Patch;
+}
+
+
+
+/**
+ Pass in a pointer to an ARM MOVW/MOVT instruciton pair and
+ return the immediate data encoded in the two` instruction.
+
+ @param Instructions Pointer to ARM MOVW/MOVT insturction pair
+
+ @return Immediate address encoded in the instructions
+
+**/
+UINT32
+ThumbMovwMovtImmediateAddress (
+ IN UINT16 *Instructions
+ )
+{
+ UINT16 *Word;
+ UINT16 *Top;
+
+ Word = Instructions; // MOVW
+ Top = Word + 2; // MOVT
+
+ return (ThumbMovtImmediateAddress (Top) << 16) + ThumbMovtImmediateAddress (Word);
+}
+
+
+/**
+ Update an ARM MOVW/MOVT immediate instruction instruction pair.
+
+ @param Instructions Pointer to ARM MOVW/MOVT instruction pair
+ @param Address New addres to patch into the instructions
+**/
+VOID
+ThumbMovwMovtImmediatePatch (
+ IN OUT UINT16 *Instructions,
+ IN UINT32 Address
+ )
+{
+ UINT16 *Word;
+ UINT16 *Top;
+
+ Word = Instructions; // MOVW
+ Top = Word + 2; // MOVT
+
+ ThumbMovtImmediatePatch (Word, (UINT16)(Address & 0xffff));
+ ThumbMovtImmediatePatch (Top, (UINT16)(Address >> 16));
+}
+
+
+
+/**
+ Performs an ARM-based specific relocation fixup and is a no-op on other
+ instruction sets.
+
+ @param Reloc The pointer to the relocation record.
+ @param Fixup The pointer to the address to fix up.
+ @param FixupData The pointer to a buffer to log the fixups.
+ @param Adjust The offset to adjust the fixup.
+
+ @return Status code.
+
+**/
+RETURN_STATUS
+PeCoffLoaderRelocateImageEx (
+ IN UINT16 *Reloc,
+ IN OUT CHAR8 *Fixup,
+ IN OUT CHAR8 **FixupData,
+ IN UINT64 Adjust
+ )
+{
+ UINT16 *Fixup16;
+ UINT32 FixupVal;
+
+ Fixup16 = (UINT16 *) Fixup;
+
+ switch ((*Reloc) >> 12) {
+
+ case EFI_IMAGE_REL_BASED_ARM_MOV32T:
+ FixupVal = ThumbMovwMovtImmediateAddress (Fixup16) + (UINT32)Adjust;
+ ThumbMovwMovtImmediatePatch (Fixup16, FixupVal);
+
+ if (*FixupData != NULL) {
+ *FixupData = ALIGN_POINTER(*FixupData, sizeof(UINT64));
+ // Fixup16 is not aligned so we must copy it. Thumb instructions are streams of 16 bytes.
+ CopyMem (*FixupData, Fixup16, sizeof (UINT64));
+ *FixupData = *FixupData + sizeof(UINT64);
+ }
+ break;
+
+ case EFI_IMAGE_REL_BASED_ARM_MOV32A:
+ ASSERT (FALSE);
+ // break omitted - ARM instruction encoding not implemented
+ default:
+ return RETURN_UNSUPPORTED;
+ }
+
+ return RETURN_SUCCESS;
+}
+
+/**
+ Returns TRUE if the machine type of PE/COFF image is supported. Supported
+ does not mean the image can be executed it means the PE/COFF loader supports
+ loading and relocating of the image type. It's up to the caller to support
+ the entry point.
+
+ @param Machine Machine type from the PE Header.
+
+ @return TRUE if this PE/COFF loader can load the image
+
+**/
+BOOLEAN
+PeCoffLoaderImageFormatSupported (
+ IN UINT16 Machine
+ )
+{
+ if ((Machine == IMAGE_FILE_MACHINE_ARMTHUMB_MIXED) || (Machine == IMAGE_FILE_MACHINE_EBC)) {
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+/**
+ Performs an ARM-based specific re-relocation fixup and is a no-op on other
+ instruction sets. This is used to re-relocated the image into the EFI virtual
+ space for runtime calls.
+
+ @param Reloc The pointer to the relocation record.
+ @param Fixup The pointer to the address to fix up.
+ @param FixupData The pointer to a buffer to log the fixups.
+ @param Adjust The offset to adjust the fixup.
+
+ @return Status code.
+
+**/
+RETURN_STATUS
+PeHotRelocateImageEx (
+ IN UINT16 *Reloc,
+ IN OUT CHAR8 *Fixup,
+ IN OUT CHAR8 **FixupData,
+ IN UINT64 Adjust
+ )
+{
+ UINT16 *Fixup16;
+ UINT32 FixupVal;
+
+ Fixup16 = (UINT16 *)Fixup;
+
+ switch ((*Reloc) >> 12) {
+
+ case EFI_IMAGE_REL_BASED_ARM_MOV32T:
+ *FixupData = ALIGN_POINTER (*FixupData, sizeof (UINT64));
+ if (*(UINT64 *) (*FixupData) == ReadUnaligned64 ((UINT64 *)Fixup16)) {
+ FixupVal = ThumbMovwMovtImmediateAddress (Fixup16) + (UINT32)Adjust;
+ ThumbMovwMovtImmediatePatch (Fixup16, FixupVal);
+ }
+ break;
+
+ case EFI_IMAGE_REL_BASED_ARM_MOV32A:
+ ASSERT (FALSE);
+ // break omitted - ARM instruction encoding not implemented
+ default:
+ DEBUG ((EFI_D_ERROR, "PeHotRelocateEx:unknown fixed type\n"));
+ return RETURN_UNSUPPORTED;
+ }
+
+ return RETURN_SUCCESS;
+}
+
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