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/** @file
PE/Coff loader for LoongArch PE image
Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "BasePeCoffLibInternals.h"
#include <Library/BaseLib.h>
/**
Performs an LoongArch specific relocation fixup and is a no-op on other
instruction sets.
@param[in] Reloc Pointer to the relocation record.
@param[in, out] Fixup Pointer to the address to fix up.
@param[in, out] FixupData Pointer to a buffer to log the fixups.
@param[in] 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
)
{
UINT8 RelocType;
UINT64 Value;
UINT64 Tmp1;
UINT64 Tmp2;
RelocType = (*Reloc) >> 12;
Value = 0;
Tmp1 = 0;
Tmp2 = 0;
switch (RelocType) {
case EFI_IMAGE_REL_BASED_LOONGARCH64_MARK_LA:
// The next four instructions are used to load a 64 bit address, relocate all of them
Value = (*(UINT32 *)Fixup & 0x1ffffe0) << 7 | // lu12i.w 20bits from bit5
(*((UINT32 *)Fixup + 1) & 0x3ffc00) >> 10; // ori 12bits from bit10
Tmp1 = *((UINT32 *)Fixup + 2) & 0x1ffffe0; // lu32i.d 20bits from bit5
Tmp2 = *((UINT32 *)Fixup + 3) & 0x3ffc00; // lu52i.d 12bits from bit10
Value = Value | (Tmp1 << 27) | (Tmp2 << 42);
Value += Adjust;
*(UINT32 *)Fixup = (*(UINT32 *)Fixup & ~0x1ffffe0) | (((Value >> 12) & 0xfffff) << 5);
if (*FixupData != NULL) {
*FixupData = ALIGN_POINTER (*FixupData, sizeof (UINT32));
*(UINT32 *)(*FixupData) = *(UINT32 *)Fixup;
*FixupData = *FixupData + sizeof (UINT32);
}
Fixup += sizeof (UINT32);
*(UINT32 *)Fixup = (*(UINT32 *)Fixup & ~0x3ffc00) | ((Value & 0xfff) << 10);
if (*FixupData != NULL) {
*FixupData = ALIGN_POINTER (*FixupData, sizeof (UINT32));
*(UINT32 *)(*FixupData) = *(UINT32 *)Fixup;
*FixupData = *FixupData + sizeof (UINT32);
}
Fixup += sizeof (UINT32);
*(UINT32 *)Fixup = (*(UINT32 *)Fixup & ~0x1ffffe0) | (((Value >> 32) & 0xfffff) << 5);
if (*FixupData != NULL) {
*FixupData = ALIGN_POINTER (*FixupData, sizeof (UINT32));
*(UINT32 *)(*FixupData) = *(UINT32 *)Fixup;
*FixupData = *FixupData + sizeof (UINT32);
}
Fixup += sizeof (UINT32);
*(UINT32 *)Fixup = (*(UINT32 *)Fixup & ~0x3ffc00) | (((Value >> 52) & 0xfff) << 10);
if (*FixupData != NULL) {
*FixupData = ALIGN_POINTER (*FixupData, sizeof (UINT32));
*(UINT32 *)(*FixupData) = *(UINT32 *)Fixup;
*FixupData = *FixupData + sizeof (UINT32);
}
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[in] 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_LOONGARCH64) {
return TRUE;
}
return FALSE;
}
/**
Performs an LOONGARCH-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[in] Reloc The pointer to the relocation record.
@param[in, out] Fixup The pointer to the address to fix up.
@param[in, out] FixupData The pointer to a buffer to log the fixups.
@param[in] 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
)
{
// To check
return PeCoffLoaderRelocateImageEx (Reloc, Fixup, FixupData, Adjust);
}
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