485b306654
Advance the *FixupData pointer after use in the second relocation pass for runtime when handling ARM MOVW/MOVT immediate relocations. Note that using FixupData is somewhat pointless for relocations targeting instructions rather than data items, since the program cannot typically modify its own instructions, and the second pass should be performed unconditionally. But let's just fix it for now. 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@18597 6f19259b-4bc3-4df7-8a09-765794883524
251 lines
6.8 KiB
C
251 lines
6.8 KiB
C
/** @file
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Specific relocation fixups for ARM architecture.
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Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
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Portions copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this 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 "BasePeCoffLibInternals.h"
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#include <Library/BaseLib.h>
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/**
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Pass in a pointer to an ARM MOVT or MOVW immediate instruciton and
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return the immediate data encoded in the instruction.
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@param Instruction Pointer to ARM MOVT or MOVW immediate instruction
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@return Immediate address encoded in the instruction
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**/
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UINT16
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ThumbMovtImmediateAddress (
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IN UINT16 *Instruction
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)
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{
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UINT32 Movt;
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UINT16 Address;
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// Thumb2 is two 16-bit instructions working together. Not a single 32-bit instruction
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// Example MOVT R0, #0 is 0x0000f2c0 or 0xf2c0 0x0000
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Movt = (*Instruction << 16) | (*(Instruction + 1));
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// imm16 = imm4:i:imm3:imm8
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// imm4 -> Bit19:Bit16
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// i -> Bit26
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// imm3 -> Bit14:Bit12
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// imm8 -> Bit7:Bit0
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Address = (UINT16)(Movt & 0x000000ff); // imm8
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Address |= (UINT16)((Movt >> 4) & 0x0000f700); // imm4 imm3
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Address |= (((Movt & BIT26) != 0) ? BIT11 : 0); // i
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return Address;
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}
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/**
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Update an ARM MOVT or MOVW immediate instruction immediate data.
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@param Instruction Pointer to ARM MOVT or MOVW immediate instruction
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@param Address New addres to patch into the instruction
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**/
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VOID
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ThumbMovtImmediatePatch (
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IN OUT UINT16 *Instruction,
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IN UINT16 Address
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)
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{
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UINT16 Patch;
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// First 16-bit chunk of instruciton
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Patch = ((Address >> 12) & 0x000f); // imm4
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Patch |= (((Address & BIT11) != 0) ? BIT10 : 0); // i
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// Mask out instruction bits and or in address
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*(Instruction) = (*Instruction & ~0x040f) | Patch;
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// Second 16-bit chunk of instruction
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Patch = Address & 0x000000ff; // imm8
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Patch |= ((Address << 4) & 0x00007000); // imm3
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// Mask out instruction bits and or in address
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Instruction++;
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*Instruction = (*Instruction & ~0x70ff) | Patch;
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}
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/**
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Pass in a pointer to an ARM MOVW/MOVT instruciton pair and
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return the immediate data encoded in the two` instruction.
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@param Instructions Pointer to ARM MOVW/MOVT insturction pair
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@return Immediate address encoded in the instructions
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**/
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UINT32
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ThumbMovwMovtImmediateAddress (
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IN UINT16 *Instructions
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)
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{
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UINT16 *Word;
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UINT16 *Top;
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Word = Instructions; // MOVW
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Top = Word + 2; // MOVT
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return (ThumbMovtImmediateAddress (Top) << 16) + ThumbMovtImmediateAddress (Word);
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}
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/**
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Update an ARM MOVW/MOVT immediate instruction instruction pair.
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@param Instructions Pointer to ARM MOVW/MOVT instruction pair
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@param Address New addres to patch into the instructions
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**/
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VOID
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ThumbMovwMovtImmediatePatch (
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IN OUT UINT16 *Instructions,
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IN UINT32 Address
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)
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{
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UINT16 *Word;
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UINT16 *Top;
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Word = Instructions; // MOVW
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Top = Word + 2; // MOVT
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ThumbMovtImmediatePatch (Word, (UINT16)(Address & 0xffff));
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ThumbMovtImmediatePatch (Top, (UINT16)(Address >> 16));
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}
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/**
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Performs an ARM-based specific relocation fixup and is a no-op on other
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instruction sets.
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@param Reloc The pointer to the relocation record.
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@param Fixup The pointer to the address to fix up.
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@param FixupData The pointer to a buffer to log the fixups.
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@param Adjust The offset to adjust the fixup.
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@return Status code.
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**/
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RETURN_STATUS
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PeCoffLoaderRelocateImageEx (
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IN UINT16 *Reloc,
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IN OUT CHAR8 *Fixup,
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IN OUT CHAR8 **FixupData,
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IN UINT64 Adjust
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)
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{
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UINT16 *Fixup16;
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UINT32 FixupVal;
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Fixup16 = (UINT16 *) Fixup;
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switch ((*Reloc) >> 12) {
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case EFI_IMAGE_REL_BASED_ARM_MOV32T:
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FixupVal = ThumbMovwMovtImmediateAddress (Fixup16) + (UINT32)Adjust;
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ThumbMovwMovtImmediatePatch (Fixup16, FixupVal);
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if (*FixupData != NULL) {
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*FixupData = ALIGN_POINTER(*FixupData, sizeof(UINT64));
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// Fixup16 is not aligned so we must copy it. Thumb instructions are streams of 16 bytes.
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CopyMem (*FixupData, Fixup16, sizeof (UINT64));
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*FixupData = *FixupData + sizeof(UINT64);
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}
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break;
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case EFI_IMAGE_REL_BASED_ARM_MOV32A:
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ASSERT (FALSE);
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// break omitted - ARM instruction encoding not implemented
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default:
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return RETURN_UNSUPPORTED;
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}
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return RETURN_SUCCESS;
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}
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/**
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Returns TRUE if the machine type of PE/COFF image is supported. Supported
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does not mean the image can be executed it means the PE/COFF loader supports
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loading and relocating of the image type. It's up to the caller to support
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the entry point.
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@param Machine Machine type from the PE Header.
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@return TRUE if this PE/COFF loader can load the image
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**/
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BOOLEAN
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PeCoffLoaderImageFormatSupported (
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IN UINT16 Machine
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)
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{
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if ((Machine == IMAGE_FILE_MACHINE_ARMTHUMB_MIXED) || (Machine == IMAGE_FILE_MACHINE_EBC)) {
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return TRUE;
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}
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return FALSE;
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}
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/**
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Performs an ARM-based specific re-relocation fixup and is a no-op on other
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instruction sets. This is used to re-relocated the image into the EFI virtual
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space for runtime calls.
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@param Reloc The pointer to the relocation record.
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@param Fixup The pointer to the address to fix up.
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@param FixupData The pointer to a buffer to log the fixups.
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@param Adjust The offset to adjust the fixup.
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@return Status code.
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**/
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RETURN_STATUS
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PeHotRelocateImageEx (
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IN UINT16 *Reloc,
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IN OUT CHAR8 *Fixup,
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IN OUT CHAR8 **FixupData,
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IN UINT64 Adjust
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)
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{
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UINT16 *Fixup16;
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UINT32 FixupVal;
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Fixup16 = (UINT16 *)Fixup;
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switch ((*Reloc) >> 12) {
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case EFI_IMAGE_REL_BASED_ARM_MOV32T:
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*FixupData = ALIGN_POINTER (*FixupData, sizeof (UINT64));
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if (*(UINT64 *) (*FixupData) == ReadUnaligned64 ((UINT64 *)Fixup16)) {
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FixupVal = ThumbMovwMovtImmediateAddress (Fixup16) + (UINT32)Adjust;
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ThumbMovwMovtImmediatePatch (Fixup16, FixupVal);
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}
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*FixupData = *FixupData + sizeof(UINT64);
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break;
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case EFI_IMAGE_REL_BASED_ARM_MOV32A:
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ASSERT (FALSE);
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// break omitted - ARM instruction encoding not implemented
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default:
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DEBUG ((EFI_D_ERROR, "PeHotRelocateEx:unknown fixed type\n"));
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return RETURN_UNSUPPORTED;
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}
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return RETURN_SUCCESS;
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}
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