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- /** @file
- IA32 and X64 Specific relocation fixups
- Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
- Portions Copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- --*/
- #include <Common/UefiBaseTypes.h>
- #include <IndustryStandard/PeImage.h>
- #include "PeCoffLib.h"
- #include "CommonLib.h"
- #include "EfiUtilityMsgs.h"
- #define EXT_IMM64(Value, Address, Size, InstPos, ValPos) \
- Value |= (((UINT64)((*(Address) >> InstPos) & (((UINT64)1 << Size) - 1))) << ValPos)
- #define INS_IMM64(Value, Address, Size, InstPos, ValPos) \
- *(UINT32*)Address = (*(UINT32*)Address & ~(((1 << Size) - 1) << InstPos)) | \
- ((UINT32)((((UINT64)Value >> ValPos) & (((UINT64)1 << Size) - 1))) << InstPos)
- #define IMM64_IMM7B_INST_WORD_X 3
- #define IMM64_IMM7B_SIZE_X 7
- #define IMM64_IMM7B_INST_WORD_POS_X 4
- #define IMM64_IMM7B_VAL_POS_X 0
- #define IMM64_IMM9D_INST_WORD_X 3
- #define IMM64_IMM9D_SIZE_X 9
- #define IMM64_IMM9D_INST_WORD_POS_X 18
- #define IMM64_IMM9D_VAL_POS_X 7
- #define IMM64_IMM5C_INST_WORD_X 3
- #define IMM64_IMM5C_SIZE_X 5
- #define IMM64_IMM5C_INST_WORD_POS_X 13
- #define IMM64_IMM5C_VAL_POS_X 16
- #define IMM64_IC_INST_WORD_X 3
- #define IMM64_IC_SIZE_X 1
- #define IMM64_IC_INST_WORD_POS_X 12
- #define IMM64_IC_VAL_POS_X 21
- #define IMM64_IMM41a_INST_WORD_X 1
- #define IMM64_IMM41a_SIZE_X 10
- #define IMM64_IMM41a_INST_WORD_POS_X 14
- #define IMM64_IMM41a_VAL_POS_X 22
- #define IMM64_IMM41b_INST_WORD_X 1
- #define IMM64_IMM41b_SIZE_X 8
- #define IMM64_IMM41b_INST_WORD_POS_X 24
- #define IMM64_IMM41b_VAL_POS_X 32
- #define IMM64_IMM41c_INST_WORD_X 2
- #define IMM64_IMM41c_SIZE_X 23
- #define IMM64_IMM41c_INST_WORD_POS_X 0
- #define IMM64_IMM41c_VAL_POS_X 40
- #define IMM64_SIGN_INST_WORD_X 3
- #define IMM64_SIGN_SIZE_X 1
- #define IMM64_SIGN_INST_WORD_POS_X 27
- #define IMM64_SIGN_VAL_POS_X 63
- RETURN_STATUS
- PeCoffLoaderRelocateIa32Image (
- IN UINT16 *Reloc,
- IN OUT CHAR8 *Fixup,
- IN OUT CHAR8 **FixupData,
- IN UINT64 Adjust
- )
- /*++
- Routine Description:
- Performs an IA-32 specific relocation fixup
- Arguments:
- Reloc - Pointer to the relocation record
- Fixup - Pointer to the address to fix up
- FixupData - Pointer to a buffer to log the fixups
- Adjust - The offset to adjust the fixup
- Returns:
- EFI_UNSUPPORTED - Unsupported now
- --*/
- {
- return RETURN_UNSUPPORTED;
- }
- /**
- Pass in a pointer to an ARM MOVT or MOVW immediate instruction 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 address to patch into the instruction
- **/
- VOID
- ThumbMovtImmediatePatch (
- IN OUT UINT16 *Instruction,
- IN UINT16 Address
- )
- {
- UINT16 Patch;
- // First 16-bit chunk of instruction
- Patch = ((Address >> 12) & 0x000f); // imm4
- Patch |= (((Address & BIT11) != 0) ? BIT10 : 0); // i
- *Instruction = (*Instruction & ~0x040f) | Patch;
- // Second 16-bit chunk of instruction
- Patch = Address & 0x000000ff; // imm8
- Patch |= ((Address << 4) & 0x00007000); // imm3
- Instruction++;
- *Instruction = (*Instruction & ~0x70ff) | Patch;
- }
- /**
- Pass in a pointer to an ARM MOVW/MOVT instruction pair and
- return the immediate data encoded in the two` instruction
- @param Instructions Pointer to ARM MOVW/MOVT instruction pair
- @return Immediate address encoded in the instructions
- **/
- UINT32
- EFIAPI
- 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 address to patch into the instructions
- **/
- VOID
- EFIAPI
- ThumbMovwMovtImmediatePatch (
- IN OUT UINT16 *Instructions,
- IN UINT32 Address
- )
- {
- UINT16 *Word;
- UINT16 *Top;
- Word = (UINT16 *)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 Pointer to the relocation record.
- @param Fixup Pointer to the address to fix up.
- @param FixupData Pointer to a buffer to log the fixups.
- @param Adjust The offset to adjust the fixup.
- @return Status code.
- **/
- RETURN_STATUS
- PeCoffLoaderRelocateArmImage (
- 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));
- CopyMem (*FixupData, Fixup16, sizeof (UINT64));
- *FixupData = *FixupData + sizeof(UINT64);
- }
- break;
- case EFI_IMAGE_REL_BASED_ARM_MOV32A:
- // break omitted - ARM instruction encoding not implemented
- default:
- return RETURN_UNSUPPORTED;
- }
- return RETURN_SUCCESS;
- }
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