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/** @file
PE/Coff loader for RISC-V PE image
Portions Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "BasePeCoffLibInternals.h"
#include <Library/BaseLib.h>
/**
Performs an RISC-V specific relocation fixup and is a no-op on
other instruction sets.
RISC-V splits 32-bit fixup into 20bit and 12-bit with two relocation
types. We have to know the lower 12-bit fixup first then we can deal
carry over on high 20-bit fixup. So we log the high 20-bit in
FixupData.
@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
)
{
UINT32 Value;
UINT32 Value2;
UINT32 *RiscVHi20Fixup;
switch ((*Reloc) >> 12) {
case EFI_IMAGE_REL_BASED_RISCV_HI20:
*(UINT64 *)(*FixupData) = (UINT64)(UINTN)Fixup;
break;
case EFI_IMAGE_REL_BASED_RISCV_LOW12I:
RiscVHi20Fixup = (UINT32 *)(*(UINT64 *)(*FixupData));
if (RiscVHi20Fixup != NULL) {
Value = (UINT32)(RV_X (*RiscVHi20Fixup, 12, 20) << 12);
Value2 = (UINT32)(RV_X (*(UINT32 *)Fixup, 20, 12));
if (Value2 & (RISCV_IMM_REACH/2)) {
Value2 |= ~(RISCV_IMM_REACH-1);
}
Value += Value2;
Value += (UINT32)Adjust;
Value2 = RISCV_CONST_HIGH_PART (Value);
*(UINT32 *)RiscVHi20Fixup = (RV_X (Value2, 12, 20) << 12) | \
(RV_X (*(UINT32 *)RiscVHi20Fixup, 0, 12));
*(UINT32 *)Fixup = (RV_X (Value, 0, 12) << 20) | \
(RV_X (*(UINT32 *)Fixup, 0, 20));
}
break;
case EFI_IMAGE_REL_BASED_RISCV_LOW12S:
RiscVHi20Fixup = (UINT32 *)(*(UINT64 *)(*FixupData));
if (RiscVHi20Fixup != NULL) {
Value = (UINT32)(RV_X (*RiscVHi20Fixup, 12, 20) << 12);
Value2 = (UINT32)(RV_X (*(UINT32 *)Fixup, 7, 5) | (RV_X (*(UINT32 *)Fixup, 25, 7) << 5));
if (Value2 & (RISCV_IMM_REACH/2)) {
Value2 |= ~(RISCV_IMM_REACH-1);
}
Value += Value2;
Value += (UINT32)Adjust;
Value2 = RISCV_CONST_HIGH_PART (Value);
*(UINT32 *)RiscVHi20Fixup = (RV_X (Value2, 12, 20) << 12) | \
(RV_X (*(UINT32 *)RiscVHi20Fixup, 0, 12));
Value2 = *(UINT32 *)Fixup & 0x01fff07f;
Value &= RISCV_IMM_REACH - 1;
*(UINT32 *)Fixup = Value2 | (UINT32)(((RV_X (Value, 0, 5) << 7) | (RV_X (Value, 5, 7) << 25)));
}
break;
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_RISCV64) {
return TRUE;
}
return FALSE;
}
/**
Performs an Itanium-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
)
{
return RETURN_UNSUPPORTED;
}
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