54a3d5ec48
Support RISC-V image relocation. REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2672 Signed-off-by: Abner Chang <abner.chang@hpe.com> Co-authored-by: Gilbert Chen <gilbert.chen@hpe.com> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org> Reviewed-by: Zhiguang Liu <zhiguang.liu@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <liming.gao@intel.com> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Gilbert Chen <gilbert.chen@hpe.com>
134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/** @file
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PE/Coff loader for RISC-V PE image
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Portions Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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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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Performs an RISC-V specific relocation fixup and is a no-op on
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other instruction sets.
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RISC-V splits 32-bit fixup into 20bit and 12-bit with two relocation
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types. We have to know the lower 12-bit fixup first then we can deal
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carry over on high 20-bit fixup. So we log the high 20-bit in
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FixupData.
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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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UINT32 Value;
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UINT32 Value2;
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UINT32 *RiscVHi20Fixup;
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switch ((*Reloc) >> 12) {
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case EFI_IMAGE_REL_BASED_RISCV_HI20:
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*(UINT64 *)(*FixupData) = (UINT64)(UINTN)Fixup;
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break;
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case EFI_IMAGE_REL_BASED_RISCV_LOW12I:
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RiscVHi20Fixup = (UINT32 *)(*(UINT64 *)(*FixupData));
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if (RiscVHi20Fixup != NULL) {
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Value = (UINT32)(RV_X(*RiscVHi20Fixup, 12, 20) << 12);
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Value2 = (UINT32)(RV_X(*(UINT32 *)Fixup, 20, 12));
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if (Value2 & (RISCV_IMM_REACH/2)) {
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Value2 |= ~(RISCV_IMM_REACH-1);
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}
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Value += Value2;
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Value += (UINT32)Adjust;
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Value2 = RISCV_CONST_HIGH_PART (Value);
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*(UINT32 *)RiscVHi20Fixup = (RV_X (Value2, 12, 20) << 12) |\
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(RV_X (*(UINT32 *)RiscVHi20Fixup, 0, 12));
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*(UINT32 *)Fixup = (RV_X (Value, 0, 12) << 20) |\
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(RV_X (*(UINT32 *)Fixup, 0, 20));
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}
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break;
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case EFI_IMAGE_REL_BASED_RISCV_LOW12S:
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RiscVHi20Fixup = (UINT32 *)(*(UINT64 *)(*FixupData));
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if (RiscVHi20Fixup != NULL) {
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Value = (UINT32)(RV_X(*RiscVHi20Fixup, 12, 20) << 12);
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Value2 = (UINT32)(RV_X(*(UINT32 *)Fixup, 7, 5) | (RV_X(*(UINT32 *)Fixup, 25, 7) << 5));
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if (Value2 & (RISCV_IMM_REACH/2)) {
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Value2 |= ~(RISCV_IMM_REACH-1);
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}
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Value += Value2;
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Value += (UINT32)Adjust;
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Value2 = RISCV_CONST_HIGH_PART (Value);
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*(UINT32 *)RiscVHi20Fixup = (RV_X (Value2, 12, 20) << 12) | \
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(RV_X (*(UINT32 *)RiscVHi20Fixup, 0, 12));
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Value2 = *(UINT32 *)Fixup & 0x01fff07f;
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Value &= RISCV_IMM_REACH - 1;
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*(UINT32 *)Fixup = Value2 | (UINT32)(((RV_X(Value, 0, 5) << 7) | (RV_X(Value, 5, 7) << 25)));
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}
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break;
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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_RISCV64) {
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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 Itanium-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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return RETURN_UNSUPPORTED;
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}
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