PeCoffLoaderEx.c revision 4fd606d1f5abe38e1f42c38de1d2e895166bd0f4
/** @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
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"
/**
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
**/
)
{
// Thumb2 is two 16-bit instructions working together. Not a single 32-bit instruction
// Example MOVT R0, #0 is 0x0000f2c0 or 0xf2c0 0x0000
// imm16 = imm4:i:imm3:imm8
// imm4 -> Bit19:Bit16
// i -> Bit26
// imm3 -> Bit14:Bit12
// imm8 -> Bit7:Bit0
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
**/
)
{
// First 16-bit chunk of instruciton
// Mask out instruction bits and or in address
// Second 16-bit chunk of instruction
// Mask out instruction bits and or in address
Instruction++;
}
/**
return the immediate data encoded in the two` instruction.
@return Immediate address encoded in the instructions
**/
)
{
}
/**
@param Address New addres to patch into the instructions
**/
)
{
}
/**
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.
**/
)
{
switch ((*Reloc) >> 12) {
// Fixup16 is not aligned so we must copy it. Thumb instructions are streams of 16 bytes.
}
break;
// break omitted - ARM instruction encoding not implemented
default:
return RETURN_UNSUPPORTED;
}
return RETURN_SUCCESS;
}
/**
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;
}
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.
**/
)
{
switch ((*Reloc) >> 12) {
}
break;
// break omitted - ARM instruction encoding not implemented
default:
return RETURN_UNSUPPORTED;
}
return RETURN_SUCCESS;
}