| //===- MSP430.cpp ---------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // The MSP430 is a 16-bit microcontroller RISC architecture. The instruction set |
| // has only 27 core instructions orthogonally augmented with a variety |
| // of addressing modes for source and destination operands. Entire address space |
| // of MSP430 is 64KB (the extended MSP430X architecture is not considered here). |
| // A typical MSP430 MCU has several kilobytes of RAM and ROM, plenty |
| // of peripherals and is generally optimized for a low power consumption. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "InputFiles.h" |
| #include "Symbols.h" |
| #include "Target.h" |
| #include "lld/Common/ErrorHandler.h" |
| #include "llvm/Object/ELF.h" |
| #include "llvm/Support/Endian.h" |
| |
| using namespace llvm; |
| using namespace llvm::object; |
| using namespace llvm::support::endian; |
| using namespace llvm::ELF; |
| using namespace lld; |
| using namespace lld::elf; |
| |
| namespace { |
| class MSP430 final : public TargetInfo { |
| public: |
| MSP430(); |
| RelExpr getRelExpr(RelType Type, const Symbol &S, |
| const uint8_t *Loc) const override; |
| void relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const override; |
| }; |
| } // namespace |
| |
| MSP430::MSP430() { |
| // mov.b #0, r3 |
| TrapInstr = {0x43, 0x43, 0x43, 0x43}; |
| } |
| |
| RelExpr MSP430::getRelExpr(RelType Type, const Symbol &S, |
| const uint8_t *Loc) const { |
| switch (Type) { |
| case R_MSP430_10_PCREL: |
| case R_MSP430_16_PCREL: |
| case R_MSP430_16_PCREL_BYTE: |
| case R_MSP430_2X_PCREL: |
| case R_MSP430_RL_PCREL: |
| case R_MSP430_SYM_DIFF: |
| return R_PC; |
| default: |
| return R_ABS; |
| } |
| } |
| |
| void MSP430::relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const { |
| switch (Type) { |
| case R_MSP430_8: |
| checkIntUInt(Loc, Val, 8, Type); |
| *Loc = Val; |
| break; |
| case R_MSP430_16: |
| case R_MSP430_16_PCREL: |
| case R_MSP430_16_BYTE: |
| case R_MSP430_16_PCREL_BYTE: |
| checkIntUInt(Loc, Val, 16, Type); |
| write16le(Loc, Val); |
| break; |
| case R_MSP430_32: |
| checkIntUInt(Loc, Val, 32, Type); |
| write32le(Loc, Val); |
| break; |
| case R_MSP430_10_PCREL: { |
| int16_t Offset = ((int16_t)Val >> 1) - 1; |
| checkInt(Loc, Offset, 10, Type); |
| write16le(Loc, (read16le(Loc) & 0xFC00) | (Offset & 0x3FF)); |
| break; |
| } |
| default: |
| error(getErrorLocation(Loc) + "unrecognized relocation " + toString(Type)); |
| } |
| } |
| |
| TargetInfo *elf::getMSP430TargetInfo() { |
| static MSP430 Target; |
| return &Target; |
| } |