blob: f03e8181923b14a0aa0f573c659df8a2f3fec4e4 [file] [log] [blame]
//===- MSP430.cpp ---------------------------------------------------------===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See 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;
namespace lld {
namespace elf {
namespace {
class MSP430 final : public TargetInfo {
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;
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;
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);
case R_MSP430_32:
checkIntUInt(loc, val, 32, type);
write32le(loc, val);
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));
error(getErrorLocation(loc) + "unrecognized relocation " + toString(type));
TargetInfo *getMSP430TargetInfo() {
static MSP430 target;
return ⌖
} // namespace elf
} // namespace lld