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Diffstat (limited to 'ELF/Arch/MSP430.cpp')
| -rw-r--r-- | ELF/Arch/MSP430.cpp | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/ELF/Arch/MSP430.cpp b/ELF/Arch/MSP430.cpp new file mode 100644 index 0000000000000..fe0c0fe64daf0 --- /dev/null +++ b/ELF/Arch/MSP430.cpp @@ -0,0 +1,94 @@ +//===- MSP430.cpp ---------------------------------------------------------===// +// +// The LLVM Linker +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// 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 reloc " + toString(Type)); + } +} + +TargetInfo *elf::getMSP430TargetInfo() { + static MSP430 Target; + return &Target; +} |
