tyler.durden/audk
1
0
Fork 0
mirror of https://github.com/acidanthera/audk.git synced 2025-11-02 20:44:39 +01:00
Code Issues Packages Projects Releases Wiki Activity
audk/BaseTools/Source/C/Common/PeCoffLoaderEx.c
Ard Biesheuvel 94762ddef6 BaseTools/PeCoffLoader: fix handling of ARM MOVW/MOVT instruction relocs 
The handling of ARM MOVW/MOVT relocations sets the FixupData twice (once
incorrectly), but fails to advance the *FixupData pointer afterwards.
This is not actually a problem, since the fixup data is never used but
let's fix it anyway in case anyone reuses this code.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18596 6f19259b-4bc3-4df7-8a09-765794883524
2015-10-09 18:55:28 +00:00

418 lines
12 KiB
C
Raw Blame History

/** @file
IA32, X64 and IPF Specific relocation fixups
Copyright (c) 2004 - 2014, Intel Corporation. All rights reserved.<BR>
Portions Copyright (c) 2011 - 2013, ARM Ltd. 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 <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;
}
RETURN_STATUS
PeCoffLoaderRelocateIpfImage (
IN UINT16 *Reloc,
IN OUT CHAR8 *Fixup,
IN OUT CHAR8 **FixupData,
IN UINT64 Adjust
)
/*++
Routine Description:
Performs an Itanium-based 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:
Status code
--*/
{
UINT64 *F64;
UINT64 FixupVal;
switch ((*Reloc) >> 12) {
case EFI_IMAGE_REL_BASED_IA64_IMM64:
//
// Align it to bundle address before fixing up the
// 64-bit immediate value of the movl instruction.
//
Fixup = (CHAR8 *)((UINTN) Fixup & (UINTN) ~(15));
FixupVal = (UINT64)0;
//
// Extract the lower 32 bits of IMM64 from bundle
//
EXT_IMM64(FixupVal,
(UINT32 *)Fixup + IMM64_IMM7B_INST_WORD_X,
IMM64_IMM7B_SIZE_X,
IMM64_IMM7B_INST_WORD_POS_X,
IMM64_IMM7B_VAL_POS_X
);
EXT_IMM64(FixupVal,
(UINT32 *)Fixup + IMM64_IMM9D_INST_WORD_X,
IMM64_IMM9D_SIZE_X,
IMM64_IMM9D_INST_WORD_POS_X,
IMM64_IMM9D_VAL_POS_X
);
EXT_IMM64(FixupVal,
(UINT32 *)Fixup + IMM64_IMM5C_INST_WORD_X,
IMM64_IMM5C_SIZE_X,
IMM64_IMM5C_INST_WORD_POS_X,
IMM64_IMM5C_VAL_POS_X
);
EXT_IMM64(FixupVal,
(UINT32 *)Fixup + IMM64_IC_INST_WORD_X,
IMM64_IC_SIZE_X,
IMM64_IC_INST_WORD_POS_X,
IMM64_IC_VAL_POS_X
);
EXT_IMM64(FixupVal,
(UINT32 *)Fixup + IMM64_IMM41a_INST_WORD_X,
IMM64_IMM41a_SIZE_X,
IMM64_IMM41a_INST_WORD_POS_X,
IMM64_IMM41a_VAL_POS_X
);
//
// Update 64-bit address
//
FixupVal += Adjust;
//
// Insert IMM64 into bundle
//
INS_IMM64(FixupVal,
((UINT32 *)Fixup + IMM64_IMM7B_INST_WORD_X),
IMM64_IMM7B_SIZE_X,
IMM64_IMM7B_INST_WORD_POS_X,
IMM64_IMM7B_VAL_POS_X
);
INS_IMM64(FixupVal,
((UINT32 *)Fixup + IMM64_IMM9D_INST_WORD_X),
IMM64_IMM9D_SIZE_X,
IMM64_IMM9D_INST_WORD_POS_X,
IMM64_IMM9D_VAL_POS_X
);
INS_IMM64(FixupVal,
((UINT32 *)Fixup + IMM64_IMM5C_INST_WORD_X),
IMM64_IMM5C_SIZE_X,
IMM64_IMM5C_INST_WORD_POS_X,
IMM64_IMM5C_VAL_POS_X
);
INS_IMM64(FixupVal,
((UINT32 *)Fixup + IMM64_IC_INST_WORD_X),
IMM64_IC_SIZE_X,
IMM64_IC_INST_WORD_POS_X,
IMM64_IC_VAL_POS_X
);
INS_IMM64(FixupVal,
((UINT32 *)Fixup + IMM64_IMM41a_INST_WORD_X),
IMM64_IMM41a_SIZE_X,
IMM64_IMM41a_INST_WORD_POS_X,
IMM64_IMM41a_VAL_POS_X
);
INS_IMM64(FixupVal,
((UINT32 *)Fixup + IMM64_IMM41b_INST_WORD_X),
IMM64_IMM41b_SIZE_X,
IMM64_IMM41b_INST_WORD_POS_X,
IMM64_IMM41b_VAL_POS_X
);
INS_IMM64(FixupVal,
((UINT32 *)Fixup + IMM64_IMM41c_INST_WORD_X),
IMM64_IMM41c_SIZE_X,
IMM64_IMM41c_INST_WORD_POS_X,
IMM64_IMM41c_VAL_POS_X
);
INS_IMM64(FixupVal,
((UINT32 *)Fixup + IMM64_SIGN_INST_WORD_X),
IMM64_SIGN_SIZE_X,
IMM64_SIGN_INST_WORD_POS_X,
IMM64_SIGN_VAL_POS_X
);
F64 = (UINT64 *) Fixup;
if (*FixupData != NULL) {
*FixupData = ALIGN_POINTER(*FixupData, sizeof(UINT64));
*(UINT64 *)(*FixupData) = *F64;
*FixupData = *FixupData + sizeof(UINT64);
}
break;
default:
return RETURN_UNSUPPORTED;
}
return RETURN_SUCCESS;
}
/**
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
*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 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
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 addres 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;
}
Reference in New Issue View Git Blame Copy Permalink