1 //===- SPARCV9.cpp --------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "InputFiles.h" 10 #include "Symbols.h" 11 #include "SyntheticSections.h" 12 #include "Target.h" 13 #include "lld/Common/ErrorHandler.h" 14 #include "llvm/Support/Endian.h" 15 16 using namespace llvm; 17 using namespace llvm::support::endian; 18 using namespace llvm::ELF; 19 20 namespace lld { 21 namespace elf { 22 23 namespace { 24 class SPARCV9 final : public TargetInfo { 25 public: 26 SPARCV9(); 27 RelExpr getRelExpr(RelType type, const Symbol &s, 28 const uint8_t *loc) const override; 29 void writePlt(uint8_t *buf, const Symbol &sym, 30 uint64_t pltEntryAddr) const override; 31 void relocateOne(uint8_t *loc, RelType type, uint64_t val) const override; 32 }; 33 } // namespace 34 35 SPARCV9::SPARCV9() { 36 copyRel = R_SPARC_COPY; 37 gotRel = R_SPARC_GLOB_DAT; 38 noneRel = R_SPARC_NONE; 39 pltRel = R_SPARC_JMP_SLOT; 40 relativeRel = R_SPARC_RELATIVE; 41 symbolicRel = R_SPARC_64; 42 pltEntrySize = 32; 43 pltHeaderSize = 4 * pltEntrySize; 44 45 defaultCommonPageSize = 8192; 46 defaultMaxPageSize = 0x100000; 47 defaultImageBase = 0x100000; 48 } 49 50 RelExpr SPARCV9::getRelExpr(RelType type, const Symbol &s, 51 const uint8_t *loc) const { 52 switch (type) { 53 case R_SPARC_32: 54 case R_SPARC_UA32: 55 case R_SPARC_64: 56 case R_SPARC_UA64: 57 return R_ABS; 58 case R_SPARC_PC10: 59 case R_SPARC_PC22: 60 case R_SPARC_DISP32: 61 case R_SPARC_WDISP30: 62 return R_PC; 63 case R_SPARC_GOT10: 64 return R_GOT_OFF; 65 case R_SPARC_GOT22: 66 return R_GOT_OFF; 67 case R_SPARC_WPLT30: 68 return R_PLT_PC; 69 case R_SPARC_NONE: 70 return R_NONE; 71 default: 72 error(getErrorLocation(loc) + "unknown relocation (" + Twine(type) + 73 ") against symbol " + toString(s)); 74 return R_NONE; 75 } 76 } 77 78 void SPARCV9::relocateOne(uint8_t *loc, RelType type, uint64_t val) const { 79 switch (type) { 80 case R_SPARC_32: 81 case R_SPARC_UA32: 82 // V-word32 83 checkUInt(loc, val, 32, type); 84 write32be(loc, val); 85 break; 86 case R_SPARC_DISP32: 87 // V-disp32 88 checkInt(loc, val, 32, type); 89 write32be(loc, val); 90 break; 91 case R_SPARC_WDISP30: 92 case R_SPARC_WPLT30: 93 // V-disp30 94 checkInt(loc, val, 32, type); 95 write32be(loc, (read32be(loc) & ~0x3fffffff) | ((val >> 2) & 0x3fffffff)); 96 break; 97 case R_SPARC_22: 98 // V-imm22 99 checkUInt(loc, val, 22, type); 100 write32be(loc, (read32be(loc) & ~0x003fffff) | (val & 0x003fffff)); 101 break; 102 case R_SPARC_GOT22: 103 case R_SPARC_PC22: 104 // T-imm22 105 write32be(loc, (read32be(loc) & ~0x003fffff) | ((val >> 10) & 0x003fffff)); 106 break; 107 case R_SPARC_WDISP19: 108 // V-disp19 109 checkInt(loc, val, 21, type); 110 write32be(loc, (read32be(loc) & ~0x0007ffff) | ((val >> 2) & 0x0007ffff)); 111 break; 112 case R_SPARC_GOT10: 113 case R_SPARC_PC10: 114 // T-simm10 115 write32be(loc, (read32be(loc) & ~0x000003ff) | (val & 0x000003ff)); 116 break; 117 case R_SPARC_64: 118 case R_SPARC_UA64: 119 // V-xword64 120 write64be(loc, val); 121 break; 122 default: 123 llvm_unreachable("unknown relocation"); 124 } 125 } 126 127 void SPARCV9::writePlt(uint8_t *buf, const Symbol & /*sym*/, 128 uint64_t pltEntryAddr) const { 129 const uint8_t pltData[] = { 130 0x03, 0x00, 0x00, 0x00, // sethi (. - .PLT0), %g1 131 0x30, 0x68, 0x00, 0x00, // ba,a %xcc, .PLT1 132 0x01, 0x00, 0x00, 0x00, // nop 133 0x01, 0x00, 0x00, 0x00, // nop 134 0x01, 0x00, 0x00, 0x00, // nop 135 0x01, 0x00, 0x00, 0x00, // nop 136 0x01, 0x00, 0x00, 0x00, // nop 137 0x01, 0x00, 0x00, 0x00 // nop 138 }; 139 memcpy(buf, pltData, sizeof(pltData)); 140 141 uint64_t off = pltEntryAddr - in.plt->getVA(); 142 relocateOne(buf, R_SPARC_22, off); 143 relocateOne(buf + 4, R_SPARC_WDISP19, -(off + 4 - pltEntrySize)); 144 } 145 146 TargetInfo *getSPARCV9TargetInfo() { 147 static SPARCV9 target; 148 return ⌖ 149 } 150 151 } // namespace elf 152 } // namespace lld 153