ed796d518c
HexagonEncodings.h contains a list of bitmasks. The file is used only by HexagonRelocationHandler.cpp. The header is odd in the sense that it uses struct Instruction but it doesn't define the data type. This patch moves the struct definition to the header. llvm-svn: 234947
331 lines
10 KiB
C++
331 lines
10 KiB
C++
//===- lib/ReaderWriter/ELF/Hexagon/HexagonRelocationHandler.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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#include "HexagonEncodings.h"
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#include "HexagonLinkingContext.h"
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#include "HexagonRelocationHandler.h"
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#include "HexagonTargetHandler.h"
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#include "llvm/Support/Endian.h"
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using namespace lld;
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using namespace lld::elf;
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using namespace llvm::ELF;
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using namespace llvm::support::endian;
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// Scatter val's bits as specified by the mask. Example:
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//
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// Val: 0bABCDEFG
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// Mask: 0b10111100001011
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// Output: 0b00ABCD0000E0FG
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static uint32_t scatterBits(uint32_t val, uint32_t mask) {
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uint32_t result = 0;
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size_t off = 0;
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for (size_t bit = 0; bit < 32; ++bit) {
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if ((mask >> bit) & 1) {
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uint32_t valBit = (val >> off) & 1;
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result |= valBit << bit;
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++off;
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}
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}
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return result;
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}
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static void relocBNPCREL(uint8_t *loc, uint64_t P, uint64_t S, uint64_t A,
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int32_t nBits) {
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int32_t result = (S + A - P) >> 2;
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int32_t range = 1 << nBits;
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if (result < range && result > -range) {
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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}
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/// \brief Word32_LO: 0x00c03fff : (S + A) : Truncate
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static void relocLO16(uint8_t *loc, uint64_t P, uint64_t S, uint64_t A) {
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uint32_t result = S + A;
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result = scatterBits(result, 0x00c03fff);
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write32le(loc, result | read32le(loc));
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}
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/// \brief Word32_LO: 0x00c03fff : (S + A) >> 16 : Truncate
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static void relocHI16(uint8_t *loc, uint64_t P, uint64_t S, uint64_t A) {
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uint32_t result = (S + A) >> 16;
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result = scatterBits(result, 0x00c03fff);
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write32le(loc, result | read32le(loc));
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}
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/// \brief Word32: 0xffffffff : (S + A) : Truncate
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static void reloc32(uint8_t *loc, uint64_t P, uint64_t S, uint64_t A) {
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uint32_t result = S + A;
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write32le(loc, result | read32le(loc));
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}
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static void reloc32_6_X(uint8_t *loc, uint64_t P, uint64_t S, uint64_t A) {
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int64_t result = (S + A) >> 6;
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int64_t range = int64_t(1) << 32;
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if (result > range)
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result = scatterBits(result, 0xfff3fff);
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write32le(loc, result | read32le(loc));
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}
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// R_HEX_B32_PCREL_X
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static void relocHexB32PCRELX(uint8_t *loc, uint64_t P, uint64_t S,
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uint64_t A) {
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int64_t result = (S + A - P) >> 6;
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result = scatterBits(result, 0xfff3fff);
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write32le(loc, result | read32le(loc));
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}
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// R_HEX_BN_PCREL_X
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static void relocHexBNPCRELX(uint8_t *loc, uint64_t P, uint64_t S, uint64_t A,
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int nbits) {
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int32_t result = (S + A - P) & 0x3f;
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int32_t range = 1 << nbits;
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if (result < range && result > -range) {
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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}
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// R_HEX_6_PCREL_X
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static void relocHex6PCRELX(uint8_t *loc, uint64_t P, uint64_t S, uint64_t A) {
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int32_t result = S + A - P;
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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// R_HEX_N_X : Word32_U6 : (S + A) : Unsigned Truncate
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static void relocHex_N_X(uint8_t *loc, uint64_t P, uint64_t S, uint64_t A) {
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uint32_t result = S + A;
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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// GP REL relocs
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static void relocHexGPRELN(uint8_t *loc, uint64_t P, uint64_t S, uint64_t A,
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uint64_t GP, int nShiftBits) {
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int32_t result = (S + A - GP) >> nShiftBits;
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int32_t range = 1L << 16;
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if (result <= range) {
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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}
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/// \brief Word32_LO: 0x00c03fff : (G) : Truncate
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static void relocHexGOTLO16(uint8_t *loc, uint64_t A, uint64_t GOT) {
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int32_t result = A - GOT;
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result = scatterBits(result, 0x00c03fff);
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write32le(loc, result | read32le(loc));
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}
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/// \brief Word32_LO: 0x00c03fff : (G) >> 16 : Truncate
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static void relocHexGOTHI16(uint8_t *loc, uint64_t A, uint64_t GOT) {
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int32_t result = (A - GOT) >> 16;
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result = scatterBits(result, 0x00c03fff);
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write32le(loc, result | read32le(loc));
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}
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/// \brief Word32: 0xffffffff : (G) : Truncate
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static void relocHexGOT32(uint8_t *loc, uint64_t A, uint64_t GOT) {
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int32_t result = GOT - A;
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write32le(loc, result | read32le(loc));
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}
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/// \brief Word32_U16 : (G) : Truncate
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static void relocHexGOT16(uint8_t *loc, uint64_t A, uint64_t GOT) {
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int32_t result = GOT - A;
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int32_t range = 1L << 16;
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if (result <= range) {
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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}
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static void relocHexGOT32_6_X(uint8_t *loc, uint64_t A, uint64_t GOT) {
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int32_t result = (A - GOT) >> 6;
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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static void relocHexGOT16_X(uint8_t *loc, uint64_t A, uint64_t GOT) {
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int32_t result = A - GOT;
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int32_t range = 1L << 6;
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if (result <= range) {
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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}
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static void relocHexGOT11_X(uint8_t *loc, uint64_t A, uint64_t GOT) {
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uint32_t result = A - GOT;
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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static void relocHexGOTRELSigned(uint8_t *loc, uint64_t P, uint64_t S,
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uint64_t A, uint64_t GOT, int shiftBits) {
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int32_t result = (S + A - GOT) >> shiftBits;
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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static void relocHexGOTRELUnsigned(uint8_t *loc, uint64_t P, uint64_t S,
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uint64_t A, uint64_t GOT) {
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uint32_t result = S + A - GOT;
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result = scatterBits(result, findv4bitmask(loc));
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write32le(loc, result | read32le(loc));
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}
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static void relocHexGOTREL_HILO16(uint8_t *loc, uint64_t P, uint64_t S,
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uint64_t A, uint64_t GOT, int shiftBits) {
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int32_t result = (S + A - GOT) >> shiftBits;
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result = scatterBits(result, 0x00c03fff);
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write32le(loc, result | read32le(loc));
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}
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static void relocHexGOTREL_32(uint8_t *loc, uint64_t P, uint64_t S, uint64_t A,
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uint64_t GOT) {
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int32_t result = S + A - GOT;
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write32le(loc, result | read32le(loc));
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}
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std::error_code HexagonTargetRelocationHandler::applyRelocation(
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ELFWriter &writer, llvm::FileOutputBuffer &buf, const AtomLayout &atom,
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const Reference &ref) const {
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uint8_t *atomContent = buf.getBufferStart() + atom._fileOffset;
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uint8_t *loc = atomContent + ref.offsetInAtom();
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uint64_t target = writer.addressOfAtom(ref.target());
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uint64_t reloc = atom._virtualAddr + ref.offsetInAtom();
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if (ref.kindNamespace() != Reference::KindNamespace::ELF)
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return std::error_code();
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assert(ref.kindArch() == Reference::KindArch::Hexagon);
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switch (ref.kindValue()) {
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case R_HEX_B22_PCREL:
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relocBNPCREL(loc, reloc, target, ref.addend(), 21);
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break;
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case R_HEX_B15_PCREL:
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relocBNPCREL(loc, reloc, target, ref.addend(), 14);
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break;
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case R_HEX_B9_PCREL:
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relocBNPCREL(loc, reloc, target, ref.addend(), 8);
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break;
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case R_HEX_LO16:
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relocLO16(loc, reloc, target, ref.addend());
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break;
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case R_HEX_HI16:
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relocHI16(loc, reloc, target, ref.addend());
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break;
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case R_HEX_32:
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reloc32(loc, reloc, target, ref.addend());
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break;
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case R_HEX_32_6_X:
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reloc32_6_X(loc, reloc, target, ref.addend());
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break;
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case R_HEX_B32_PCREL_X:
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relocHexB32PCRELX(loc, reloc, target, ref.addend());
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break;
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case R_HEX_B22_PCREL_X:
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relocHexBNPCRELX(loc, reloc, target, ref.addend(), 21);
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break;
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case R_HEX_B15_PCREL_X:
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relocHexBNPCRELX(loc, reloc, target, ref.addend(), 14);
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break;
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case R_HEX_B13_PCREL_X:
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relocHexBNPCRELX(loc, reloc, target, ref.addend(), 12);
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break;
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case R_HEX_B9_PCREL_X:
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relocHexBNPCRELX(loc, reloc, target, ref.addend(), 8);
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break;
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case R_HEX_B7_PCREL_X:
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relocHexBNPCRELX(loc, reloc, target, ref.addend(), 6);
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break;
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case R_HEX_GPREL16_0:
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relocHexGPRELN(loc, reloc, target, ref.addend(),
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_targetLayout.getSDataSection()->virtualAddr(), 0);
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break;
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case R_HEX_GPREL16_1:
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relocHexGPRELN(loc, reloc, target, ref.addend(),
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_targetLayout.getSDataSection()->virtualAddr(), 1);
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break;
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case R_HEX_GPREL16_2:
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relocHexGPRELN(loc, reloc, target, ref.addend(),
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_targetLayout.getSDataSection()->virtualAddr(), 2);
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break;
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case R_HEX_GPREL16_3:
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relocHexGPRELN(loc, reloc, target, ref.addend(),
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_targetLayout.getSDataSection()->virtualAddr(), 3);
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break;
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case R_HEX_16_X:
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case R_HEX_12_X:
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case R_HEX_11_X:
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case R_HEX_10_X:
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case R_HEX_9_X:
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case R_HEX_8_X:
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case R_HEX_7_X:
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case R_HEX_6_X:
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relocHex_N_X(loc, reloc, target, ref.addend());
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break;
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case R_HEX_6_PCREL_X:
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relocHex6PCRELX(loc, reloc, target, ref.addend());
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break;
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case R_HEX_JMP_SLOT:
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case R_HEX_GLOB_DAT:
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break;
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case R_HEX_GOTREL_32:
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relocHexGOTREL_32(loc, reloc, target, ref.addend(),
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_targetLayout.getGOTSymAddr());
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break;
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case R_HEX_GOTREL_LO16:
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relocHexGOTREL_HILO16(loc, reloc, target, ref.addend(),
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_targetLayout.getGOTSymAddr(), 0);
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break;
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case R_HEX_GOTREL_HI16:
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relocHexGOTREL_HILO16(loc, reloc, target, ref.addend(),
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_targetLayout.getGOTSymAddr(), 16);
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break;
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case R_HEX_GOT_LO16:
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relocHexGOTLO16(loc, target, _targetLayout.getGOTSymAddr());
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break;
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case R_HEX_GOT_HI16:
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relocHexGOTHI16(loc, target, _targetLayout.getGOTSymAddr());
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break;
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case R_HEX_GOT_32:
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relocHexGOT32(loc, target, _targetLayout.getGOTSymAddr());
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break;
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case R_HEX_GOT_16:
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relocHexGOT16(loc, target, _targetLayout.getGOTSymAddr());
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break;
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case R_HEX_GOT_32_6_X:
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relocHexGOT32_6_X(loc, target, _targetLayout.getGOTSymAddr());
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break;
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case R_HEX_GOT_16_X:
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relocHexGOT16_X(loc, target, _targetLayout.getGOTSymAddr());
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break;
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case R_HEX_GOT_11_X:
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relocHexGOT11_X(loc, target, _targetLayout.getGOTSymAddr());
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break;
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case R_HEX_GOTREL_32_6_X:
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relocHexGOTRELSigned(loc, reloc, target, ref.addend(),
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_targetLayout.getGOTSymAddr(), 6);
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break;
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case R_HEX_GOTREL_16_X:
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case R_HEX_GOTREL_11_X:
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relocHexGOTRELUnsigned(loc, reloc, target, ref.addend(),
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_targetLayout.getGOTSymAddr());
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break;
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default:
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return make_unhandled_reloc_error();
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}
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return std::error_code();
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}
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