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