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 "Symbols.h"
10 #include "SyntheticSections.h"
11 #include "Target.h"
12 #include "lld/Common/ErrorHandler.h"
13 #include "llvm/Support/Endian.h"
14
15 using namespace llvm;
16 using namespace llvm::support::endian;
17 using namespace llvm::ELF;
18 using namespace lld;
19 using namespace lld::elf;
20
21 namespace {
22 class SPARCV9 final : public TargetInfo {
23 public:
24 SPARCV9();
25 RelExpr getRelExpr(RelType type, const Symbol &s,
26 const uint8_t *loc) const override;
27 void writePlt(uint8_t *buf, const Symbol &sym,
28 uint64_t pltEntryAddr) const override;
29 void relocate(uint8_t *loc, const Relocation &rel,
30 uint64_t val) const override;
31 };
32 } // namespace
33
SPARCV9()34 SPARCV9::SPARCV9() {
35 copyRel = R_SPARC_COPY;
36 gotRel = R_SPARC_GLOB_DAT;
37 pltRel = R_SPARC_JMP_SLOT;
38 relativeRel = R_SPARC_RELATIVE;
39 symbolicRel = R_SPARC_64;
40 pltEntrySize = 32;
41 pltHeaderSize = 4 * pltEntrySize;
42
43 defaultCommonPageSize = 8192;
44 defaultMaxPageSize = 0x100000;
45 defaultImageBase = 0x100000;
46 }
47
getRelExpr(RelType type,const Symbol & s,const uint8_t * loc) const48 RelExpr SPARCV9::getRelExpr(RelType type, const Symbol &s,
49 const uint8_t *loc) const {
50 switch (type) {
51 case R_SPARC_32:
52 case R_SPARC_UA32:
53 case R_SPARC_64:
54 case R_SPARC_UA64:
55 case R_SPARC_H44:
56 case R_SPARC_M44:
57 case R_SPARC_L44:
58 case R_SPARC_HH22:
59 case R_SPARC_HM10:
60 case R_SPARC_LM22:
61 case R_SPARC_HI22:
62 case R_SPARC_LO10:
63 return R_ABS;
64 case R_SPARC_PC10:
65 case R_SPARC_PC22:
66 case R_SPARC_DISP32:
67 case R_SPARC_WDISP30:
68 return R_PC;
69 case R_SPARC_GOT10:
70 return R_GOT_OFF;
71 case R_SPARC_GOT22:
72 return R_GOT_OFF;
73 case R_SPARC_WPLT30:
74 return R_PLT_PC;
75 case R_SPARC_NONE:
76 return R_NONE;
77 case R_SPARC_TLS_LE_HIX22:
78 case R_SPARC_TLS_LE_LOX10:
79 return R_TPREL;
80 default:
81 error(getErrorLocation(loc) + "unknown relocation (" + Twine(type) +
82 ") against symbol " + toString(s));
83 return R_NONE;
84 }
85 }
86
relocate(uint8_t * loc,const Relocation & rel,uint64_t val) const87 void SPARCV9::relocate(uint8_t *loc, const Relocation &rel,
88 uint64_t val) const {
89 switch (rel.type) {
90 case R_SPARC_32:
91 case R_SPARC_UA32:
92 // V-word32
93 checkUInt(loc, val, 32, rel);
94 write32be(loc, val);
95 break;
96 case R_SPARC_DISP32:
97 // V-disp32
98 checkInt(loc, val, 32, rel);
99 write32be(loc, val);
100 break;
101 case R_SPARC_WDISP30:
102 case R_SPARC_WPLT30:
103 // V-disp30
104 checkInt(loc, val, 32, rel);
105 write32be(loc, (read32be(loc) & ~0x3fffffff) | ((val >> 2) & 0x3fffffff));
106 break;
107 case R_SPARC_22:
108 // V-imm22
109 checkUInt(loc, val, 22, rel);
110 write32be(loc, (read32be(loc) & ~0x003fffff) | (val & 0x003fffff));
111 break;
112 case R_SPARC_GOT22:
113 case R_SPARC_PC22:
114 case R_SPARC_LM22:
115 // T-imm22
116 write32be(loc, (read32be(loc) & ~0x003fffff) | ((val >> 10) & 0x003fffff));
117 break;
118 case R_SPARC_HI22:
119 // V-imm22
120 checkUInt(loc, val >> 10, 22, rel);
121 write32be(loc, (read32be(loc) & ~0x003fffff) | ((val >> 10) & 0x003fffff));
122 break;
123 case R_SPARC_WDISP19:
124 // V-disp19
125 checkInt(loc, val, 21, rel);
126 write32be(loc, (read32be(loc) & ~0x0007ffff) | ((val >> 2) & 0x0007ffff));
127 break;
128 case R_SPARC_GOT10:
129 case R_SPARC_PC10:
130 // T-simm10
131 write32be(loc, (read32be(loc) & ~0x000003ff) | (val & 0x000003ff));
132 break;
133 case R_SPARC_LO10:
134 // T-simm13
135 write32be(loc, (read32be(loc) & ~0x00001fff) | (val & 0x000003ff));
136 break;
137 case R_SPARC_64:
138 case R_SPARC_UA64:
139 // V-xword64
140 write64be(loc, val);
141 break;
142 case R_SPARC_HH22:
143 // V-imm22
144 checkUInt(loc, val >> 42, 22, rel);
145 write32be(loc, (read32be(loc) & ~0x003fffff) | ((val >> 42) & 0x003fffff));
146 break;
147 case R_SPARC_HM10:
148 // T-simm13
149 write32be(loc, (read32be(loc) & ~0x00001fff) | ((val >> 32) & 0x000003ff));
150 break;
151 case R_SPARC_H44:
152 // V-imm22
153 checkUInt(loc, val >> 22, 22, rel);
154 write32be(loc, (read32be(loc) & ~0x003fffff) | ((val >> 22) & 0x003fffff));
155 break;
156 case R_SPARC_M44:
157 // T-imm10
158 write32be(loc, (read32be(loc) & ~0x000003ff) | ((val >> 12) & 0x000003ff));
159 break;
160 case R_SPARC_L44:
161 // T-imm13
162 write32be(loc, (read32be(loc) & ~0x00001fff) | (val & 0x00000fff));
163 break;
164 case R_SPARC_TLS_LE_HIX22:
165 // T-imm22
166 write32be(loc, (read32be(loc) & ~0x003fffff) | ((~val >> 10) & 0x003fffff));
167 break;
168 case R_SPARC_TLS_LE_LOX10:
169 // T-simm13
170 write32be(loc, (read32be(loc) & ~0x00001fff) | (val & 0x000003ff) | 0x1C00);
171 break;
172 default:
173 llvm_unreachable("unknown relocation");
174 }
175 }
176
writePlt(uint8_t * buf,const Symbol &,uint64_t pltEntryAddr) const177 void SPARCV9::writePlt(uint8_t *buf, const Symbol & /*sym*/,
178 uint64_t pltEntryAddr) const {
179 const uint8_t pltData[] = {
180 0x03, 0x00, 0x00, 0x00, // sethi (. - .PLT0), %g1
181 0x30, 0x68, 0x00, 0x00, // ba,a %xcc, .PLT1
182 0x01, 0x00, 0x00, 0x00, // nop
183 0x01, 0x00, 0x00, 0x00, // nop
184 0x01, 0x00, 0x00, 0x00, // nop
185 0x01, 0x00, 0x00, 0x00, // nop
186 0x01, 0x00, 0x00, 0x00, // nop
187 0x01, 0x00, 0x00, 0x00 // nop
188 };
189 memcpy(buf, pltData, sizeof(pltData));
190
191 uint64_t off = pltEntryAddr - in.plt->getVA();
192 relocateNoSym(buf, R_SPARC_22, off);
193 relocateNoSym(buf + 4, R_SPARC_WDISP19, -(off + 4 - pltEntrySize));
194 }
195
getSPARCV9TargetInfo()196 TargetInfo *elf::getSPARCV9TargetInfo() {
197 static SPARCV9 target;
198 return ⌖
199 }
200