File: | llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp |
Warning: | line 1064, column 67 The left operand of '-' is a garbage value |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
1 | //===-- ARMAsmBackend.cpp - ARM Assembler Backend -------------------------===// | |||
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 "MCTargetDesc/ARMAsmBackend.h" | |||
10 | #include "MCTargetDesc/ARMAddressingModes.h" | |||
11 | #include "MCTargetDesc/ARMAsmBackendDarwin.h" | |||
12 | #include "MCTargetDesc/ARMAsmBackendELF.h" | |||
13 | #include "MCTargetDesc/ARMAsmBackendWinCOFF.h" | |||
14 | #include "MCTargetDesc/ARMFixupKinds.h" | |||
15 | #include "MCTargetDesc/ARMMCTargetDesc.h" | |||
16 | #include "llvm/ADT/StringSwitch.h" | |||
17 | #include "llvm/BinaryFormat/ELF.h" | |||
18 | #include "llvm/BinaryFormat/MachO.h" | |||
19 | #include "llvm/MC/MCAsmBackend.h" | |||
20 | #include "llvm/MC/MCAssembler.h" | |||
21 | #include "llvm/MC/MCContext.h" | |||
22 | #include "llvm/MC/MCDirectives.h" | |||
23 | #include "llvm/MC/MCELFObjectWriter.h" | |||
24 | #include "llvm/MC/MCExpr.h" | |||
25 | #include "llvm/MC/MCFixupKindInfo.h" | |||
26 | #include "llvm/MC/MCObjectWriter.h" | |||
27 | #include "llvm/MC/MCRegisterInfo.h" | |||
28 | #include "llvm/MC/MCSectionELF.h" | |||
29 | #include "llvm/MC/MCSectionMachO.h" | |||
30 | #include "llvm/MC/MCSubtargetInfo.h" | |||
31 | #include "llvm/MC/MCValue.h" | |||
32 | #include "llvm/MC/MCAsmLayout.h" | |||
33 | #include "llvm/Support/Debug.h" | |||
34 | #include "llvm/Support/EndianStream.h" | |||
35 | #include "llvm/Support/ErrorHandling.h" | |||
36 | #include "llvm/Support/Format.h" | |||
37 | #include "llvm/Support/TargetParser.h" | |||
38 | #include "llvm/Support/raw_ostream.h" | |||
39 | using namespace llvm; | |||
40 | ||||
41 | namespace { | |||
42 | class ARMELFObjectWriter : public MCELFObjectTargetWriter { | |||
43 | public: | |||
44 | ARMELFObjectWriter(uint8_t OSABI) | |||
45 | : MCELFObjectTargetWriter(/*Is64Bit*/ false, OSABI, ELF::EM_ARM, | |||
46 | /*HasRelocationAddend*/ false) {} | |||
47 | }; | |||
48 | } // end anonymous namespace | |||
49 | ||||
50 | Optional<MCFixupKind> ARMAsmBackend::getFixupKind(StringRef Name) const { | |||
51 | if (!STI.getTargetTriple().isOSBinFormatELF()) | |||
52 | return None; | |||
53 | ||||
54 | unsigned Type = llvm::StringSwitch<unsigned>(Name) | |||
55 | #define ELF_RELOC(X, Y) .Case(#X, Y) | |||
56 | #include "llvm/BinaryFormat/ELFRelocs/ARM.def" | |||
57 | #undef ELF_RELOC | |||
58 | .Default(-1u); | |||
59 | if (Type == -1u) | |||
60 | return None; | |||
61 | return static_cast<MCFixupKind>(FirstLiteralRelocationKind + Type); | |||
62 | } | |||
63 | ||||
64 | const MCFixupKindInfo &ARMAsmBackend::getFixupKindInfo(MCFixupKind Kind) const { | |||
65 | unsigned IsPCRelConstant = | |||
66 | MCFixupKindInfo::FKF_IsPCRel | MCFixupKindInfo::FKF_Constant; | |||
67 | const static MCFixupKindInfo InfosLE[ARM::NumTargetFixupKinds] = { | |||
68 | // This table *must* be in the order that the fixup_* kinds are defined in | |||
69 | // ARMFixupKinds.h. | |||
70 | // | |||
71 | // Name Offset (bits) Size (bits) Flags | |||
72 | {"fixup_arm_ldst_pcrel_12", 0, 32, IsPCRelConstant}, | |||
73 | {"fixup_t2_ldst_pcrel_12", 0, 32, | |||
74 | IsPCRelConstant | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
75 | {"fixup_arm_pcrel_10_unscaled", 0, 32, IsPCRelConstant}, | |||
76 | {"fixup_arm_pcrel_10", 0, 32, IsPCRelConstant}, | |||
77 | {"fixup_t2_pcrel_10", 0, 32, | |||
78 | MCFixupKindInfo::FKF_IsPCRel | | |||
79 | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
80 | {"fixup_arm_pcrel_9", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
81 | {"fixup_t2_pcrel_9", 0, 32, | |||
82 | IsPCRelConstant | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
83 | {"fixup_thumb_adr_pcrel_10", 0, 8, | |||
84 | IsPCRelConstant | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
85 | {"fixup_arm_adr_pcrel_12", 0, 32, IsPCRelConstant}, | |||
86 | {"fixup_t2_adr_pcrel_12", 0, 32, | |||
87 | IsPCRelConstant | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
88 | {"fixup_arm_condbranch", 0, 24, MCFixupKindInfo::FKF_IsPCRel}, | |||
89 | {"fixup_arm_uncondbranch", 0, 24, MCFixupKindInfo::FKF_IsPCRel}, | |||
90 | {"fixup_t2_condbranch", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
91 | {"fixup_t2_uncondbranch", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
92 | {"fixup_arm_thumb_br", 0, 16, MCFixupKindInfo::FKF_IsPCRel}, | |||
93 | {"fixup_arm_uncondbl", 0, 24, MCFixupKindInfo::FKF_IsPCRel}, | |||
94 | {"fixup_arm_condbl", 0, 24, MCFixupKindInfo::FKF_IsPCRel}, | |||
95 | {"fixup_arm_blx", 0, 24, MCFixupKindInfo::FKF_IsPCRel}, | |||
96 | {"fixup_arm_thumb_bl", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
97 | {"fixup_arm_thumb_blx", 0, 32, | |||
98 | MCFixupKindInfo::FKF_IsPCRel | | |||
99 | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
100 | {"fixup_arm_thumb_cb", 0, 16, MCFixupKindInfo::FKF_IsPCRel}, | |||
101 | {"fixup_arm_thumb_cp", 0, 8, | |||
102 | MCFixupKindInfo::FKF_IsPCRel | | |||
103 | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
104 | {"fixup_arm_thumb_bcc", 0, 8, MCFixupKindInfo::FKF_IsPCRel}, | |||
105 | // movw / movt: 16-bits immediate but scattered into two chunks 0 - 12, 16 | |||
106 | // - 19. | |||
107 | {"fixup_arm_movt_hi16", 0, 20, 0}, | |||
108 | {"fixup_arm_movw_lo16", 0, 20, 0}, | |||
109 | {"fixup_t2_movt_hi16", 0, 20, 0}, | |||
110 | {"fixup_t2_movw_lo16", 0, 20, 0}, | |||
111 | {"fixup_arm_mod_imm", 0, 12, 0}, | |||
112 | {"fixup_t2_so_imm", 0, 26, 0}, | |||
113 | {"fixup_bf_branch", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
114 | {"fixup_bf_target", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
115 | {"fixup_bfl_target", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
116 | {"fixup_bfc_target", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
117 | {"fixup_bfcsel_else_target", 0, 32, 0}, | |||
118 | {"fixup_wls", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
119 | {"fixup_le", 0, 32, MCFixupKindInfo::FKF_IsPCRel} | |||
120 | }; | |||
121 | const static MCFixupKindInfo InfosBE[ARM::NumTargetFixupKinds] = { | |||
122 | // This table *must* be in the order that the fixup_* kinds are defined in | |||
123 | // ARMFixupKinds.h. | |||
124 | // | |||
125 | // Name Offset (bits) Size (bits) Flags | |||
126 | {"fixup_arm_ldst_pcrel_12", 0, 32, IsPCRelConstant}, | |||
127 | {"fixup_t2_ldst_pcrel_12", 0, 32, | |||
128 | IsPCRelConstant | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
129 | {"fixup_arm_pcrel_10_unscaled", 0, 32, IsPCRelConstant}, | |||
130 | {"fixup_arm_pcrel_10", 0, 32, IsPCRelConstant}, | |||
131 | {"fixup_t2_pcrel_10", 0, 32, | |||
132 | MCFixupKindInfo::FKF_IsPCRel | | |||
133 | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
134 | {"fixup_arm_pcrel_9", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
135 | {"fixup_t2_pcrel_9", 0, 32, | |||
136 | IsPCRelConstant | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
137 | {"fixup_thumb_adr_pcrel_10", 8, 8, | |||
138 | IsPCRelConstant | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
139 | {"fixup_arm_adr_pcrel_12", 0, 32, IsPCRelConstant}, | |||
140 | {"fixup_t2_adr_pcrel_12", 0, 32, | |||
141 | IsPCRelConstant | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
142 | {"fixup_arm_condbranch", 8, 24, MCFixupKindInfo::FKF_IsPCRel}, | |||
143 | {"fixup_arm_uncondbranch", 8, 24, MCFixupKindInfo::FKF_IsPCRel}, | |||
144 | {"fixup_t2_condbranch", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
145 | {"fixup_t2_uncondbranch", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
146 | {"fixup_arm_thumb_br", 0, 16, MCFixupKindInfo::FKF_IsPCRel}, | |||
147 | {"fixup_arm_uncondbl", 8, 24, MCFixupKindInfo::FKF_IsPCRel}, | |||
148 | {"fixup_arm_condbl", 8, 24, MCFixupKindInfo::FKF_IsPCRel}, | |||
149 | {"fixup_arm_blx", 8, 24, MCFixupKindInfo::FKF_IsPCRel}, | |||
150 | {"fixup_arm_thumb_bl", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
151 | {"fixup_arm_thumb_blx", 0, 32, | |||
152 | MCFixupKindInfo::FKF_IsPCRel | | |||
153 | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
154 | {"fixup_arm_thumb_cb", 0, 16, MCFixupKindInfo::FKF_IsPCRel}, | |||
155 | {"fixup_arm_thumb_cp", 8, 8, | |||
156 | MCFixupKindInfo::FKF_IsPCRel | | |||
157 | MCFixupKindInfo::FKF_IsAlignedDownTo32Bits}, | |||
158 | {"fixup_arm_thumb_bcc", 8, 8, MCFixupKindInfo::FKF_IsPCRel}, | |||
159 | // movw / movt: 16-bits immediate but scattered into two chunks 0 - 12, 16 | |||
160 | // - 19. | |||
161 | {"fixup_arm_movt_hi16", 12, 20, 0}, | |||
162 | {"fixup_arm_movw_lo16", 12, 20, 0}, | |||
163 | {"fixup_t2_movt_hi16", 12, 20, 0}, | |||
164 | {"fixup_t2_movw_lo16", 12, 20, 0}, | |||
165 | {"fixup_arm_mod_imm", 20, 12, 0}, | |||
166 | {"fixup_t2_so_imm", 26, 6, 0}, | |||
167 | {"fixup_bf_branch", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
168 | {"fixup_bf_target", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
169 | {"fixup_bfl_target", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
170 | {"fixup_bfc_target", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
171 | {"fixup_bfcsel_else_target", 0, 32, 0}, | |||
172 | {"fixup_wls", 0, 32, MCFixupKindInfo::FKF_IsPCRel}, | |||
173 | {"fixup_le", 0, 32, MCFixupKindInfo::FKF_IsPCRel} | |||
174 | }; | |||
175 | ||||
176 | // Fixup kinds from .reloc directive are like R_ARM_NONE. They do not require | |||
177 | // any extra processing. | |||
178 | if (Kind >= FirstLiteralRelocationKind) | |||
179 | return MCAsmBackend::getFixupKindInfo(FK_NONE); | |||
180 | ||||
181 | if (Kind < FirstTargetFixupKind) | |||
182 | return MCAsmBackend::getFixupKindInfo(Kind); | |||
183 | ||||
184 | assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&((unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds () && "Invalid kind!") ? static_cast<void> (0) : __assert_fail ("unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() && \"Invalid kind!\"" , "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 185, __PRETTY_FUNCTION__)) | |||
185 | "Invalid kind!")((unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds () && "Invalid kind!") ? static_cast<void> (0) : __assert_fail ("unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() && \"Invalid kind!\"" , "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 185, __PRETTY_FUNCTION__)); | |||
186 | return (Endian == support::little ? InfosLE | |||
187 | : InfosBE)[Kind - FirstTargetFixupKind]; | |||
188 | } | |||
189 | ||||
190 | void ARMAsmBackend::handleAssemblerFlag(MCAssemblerFlag Flag) { | |||
191 | switch (Flag) { | |||
192 | default: | |||
193 | break; | |||
194 | case MCAF_Code16: | |||
195 | setIsThumb(true); | |||
196 | break; | |||
197 | case MCAF_Code32: | |||
198 | setIsThumb(false); | |||
199 | break; | |||
200 | } | |||
201 | } | |||
202 | ||||
203 | unsigned ARMAsmBackend::getRelaxedOpcode(unsigned Op, | |||
204 | const MCSubtargetInfo &STI) const { | |||
205 | bool HasThumb2 = STI.getFeatureBits()[ARM::FeatureThumb2]; | |||
206 | bool HasV8MBaselineOps = STI.getFeatureBits()[ARM::HasV8MBaselineOps]; | |||
207 | ||||
208 | switch (Op) { | |||
209 | default: | |||
210 | return Op; | |||
211 | case ARM::tBcc: | |||
212 | return HasThumb2 ? (unsigned)ARM::t2Bcc : Op; | |||
213 | case ARM::tLDRpci: | |||
214 | return HasThumb2 ? (unsigned)ARM::t2LDRpci : Op; | |||
215 | case ARM::tADR: | |||
216 | return HasThumb2 ? (unsigned)ARM::t2ADR : Op; | |||
217 | case ARM::tB: | |||
218 | return HasV8MBaselineOps ? (unsigned)ARM::t2B : Op; | |||
219 | case ARM::tCBZ: | |||
220 | return ARM::tHINT; | |||
221 | case ARM::tCBNZ: | |||
222 | return ARM::tHINT; | |||
223 | } | |||
224 | } | |||
225 | ||||
226 | bool ARMAsmBackend::mayNeedRelaxation(const MCInst &Inst, | |||
227 | const MCSubtargetInfo &STI) const { | |||
228 | if (getRelaxedOpcode(Inst.getOpcode(), STI) != Inst.getOpcode()) | |||
229 | return true; | |||
230 | return false; | |||
231 | } | |||
232 | ||||
233 | static const char *checkPCRelOffset(uint64_t Value, int64_t Min, int64_t Max) { | |||
234 | int64_t Offset = int64_t(Value) - 4; | |||
235 | if (Offset < Min || Offset > Max) | |||
236 | return "out of range pc-relative fixup value"; | |||
237 | return nullptr; | |||
238 | } | |||
239 | ||||
240 | const char *ARMAsmBackend::reasonForFixupRelaxation(const MCFixup &Fixup, | |||
241 | uint64_t Value) const { | |||
242 | switch (Fixup.getTargetKind()) { | |||
243 | case ARM::fixup_arm_thumb_br: { | |||
244 | // Relaxing tB to t2B. tB has a signed 12-bit displacement with the | |||
245 | // low bit being an implied zero. There's an implied +4 offset for the | |||
246 | // branch, so we adjust the other way here to determine what's | |||
247 | // encodable. | |||
248 | // | |||
249 | // Relax if the value is too big for a (signed) i8. | |||
250 | int64_t Offset = int64_t(Value) - 4; | |||
251 | if (Offset > 2046 || Offset < -2048) | |||
252 | return "out of range pc-relative fixup value"; | |||
253 | break; | |||
254 | } | |||
255 | case ARM::fixup_arm_thumb_bcc: { | |||
256 | // Relaxing tBcc to t2Bcc. tBcc has a signed 9-bit displacement with the | |||
257 | // low bit being an implied zero. There's an implied +4 offset for the | |||
258 | // branch, so we adjust the other way here to determine what's | |||
259 | // encodable. | |||
260 | // | |||
261 | // Relax if the value is too big for a (signed) i8. | |||
262 | int64_t Offset = int64_t(Value) - 4; | |||
263 | if (Offset > 254 || Offset < -256) | |||
264 | return "out of range pc-relative fixup value"; | |||
265 | break; | |||
266 | } | |||
267 | case ARM::fixup_thumb_adr_pcrel_10: | |||
268 | case ARM::fixup_arm_thumb_cp: { | |||
269 | // If the immediate is negative, greater than 1020, or not a multiple | |||
270 | // of four, the wide version of the instruction must be used. | |||
271 | int64_t Offset = int64_t(Value) - 4; | |||
272 | if (Offset & 3) | |||
273 | return "misaligned pc-relative fixup value"; | |||
274 | else if (Offset > 1020 || Offset < 0) | |||
275 | return "out of range pc-relative fixup value"; | |||
276 | break; | |||
277 | } | |||
278 | case ARM::fixup_arm_thumb_cb: { | |||
279 | // If we have a Thumb CBZ or CBNZ instruction and its target is the next | |||
280 | // instruction it is actually out of range for the instruction. | |||
281 | // It will be changed to a NOP. | |||
282 | int64_t Offset = (Value & ~1); | |||
283 | if (Offset == 2) | |||
284 | return "will be converted to nop"; | |||
285 | break; | |||
286 | } | |||
287 | case ARM::fixup_bf_branch: | |||
288 | return checkPCRelOffset(Value, 0, 30); | |||
289 | case ARM::fixup_bf_target: | |||
290 | return checkPCRelOffset(Value, -0x10000, +0xfffe); | |||
291 | case ARM::fixup_bfl_target: | |||
292 | return checkPCRelOffset(Value, -0x40000, +0x3fffe); | |||
293 | case ARM::fixup_bfc_target: | |||
294 | return checkPCRelOffset(Value, -0x1000, +0xffe); | |||
295 | case ARM::fixup_wls: | |||
296 | return checkPCRelOffset(Value, 0, +0xffe); | |||
297 | case ARM::fixup_le: | |||
298 | // The offset field in the LE and LETP instructions is an 11-bit | |||
299 | // value shifted left by 2 (i.e. 0,2,4,...,4094), and it is | |||
300 | // interpreted as a negative offset from the value read from pc, | |||
301 | // i.e. from instruction_address+4. | |||
302 | // | |||
303 | // So an LE instruction can in principle address the instruction | |||
304 | // immediately after itself, or (not very usefully) the address | |||
305 | // half way through the 4-byte LE. | |||
306 | return checkPCRelOffset(Value, -0xffe, 0); | |||
307 | case ARM::fixup_bfcsel_else_target: { | |||
308 | if (Value != 2 && Value != 4) | |||
309 | return "out of range label-relative fixup value"; | |||
310 | break; | |||
311 | } | |||
312 | ||||
313 | default: | |||
314 | llvm_unreachable("Unexpected fixup kind in reasonForFixupRelaxation()!")::llvm::llvm_unreachable_internal("Unexpected fixup kind in reasonForFixupRelaxation()!" , "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 314); | |||
315 | } | |||
316 | return nullptr; | |||
317 | } | |||
318 | ||||
319 | bool ARMAsmBackend::fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, | |||
320 | const MCRelaxableFragment *DF, | |||
321 | const MCAsmLayout &Layout) const { | |||
322 | return reasonForFixupRelaxation(Fixup, Value); | |||
323 | } | |||
324 | ||||
325 | void ARMAsmBackend::relaxInstruction(MCInst &Inst, | |||
326 | const MCSubtargetInfo &STI) const { | |||
327 | unsigned RelaxedOp = getRelaxedOpcode(Inst.getOpcode(), STI); | |||
328 | ||||
329 | // Sanity check w/ diagnostic if we get here w/ a bogus instruction. | |||
330 | if (RelaxedOp == Inst.getOpcode()) { | |||
331 | SmallString<256> Tmp; | |||
332 | raw_svector_ostream OS(Tmp); | |||
333 | Inst.dump_pretty(OS); | |||
334 | OS << "\n"; | |||
335 | report_fatal_error("unexpected instruction to relax: " + OS.str()); | |||
336 | } | |||
337 | ||||
338 | // If we are changing Thumb CBZ or CBNZ instruction to a NOP, aka tHINT, we | |||
339 | // have to change the operands too. | |||
340 | if ((Inst.getOpcode() == ARM::tCBZ || Inst.getOpcode() == ARM::tCBNZ) && | |||
341 | RelaxedOp == ARM::tHINT) { | |||
342 | MCInst Res; | |||
343 | Res.setOpcode(RelaxedOp); | |||
344 | Res.addOperand(MCOperand::createImm(0)); | |||
345 | Res.addOperand(MCOperand::createImm(14)); | |||
346 | Res.addOperand(MCOperand::createReg(0)); | |||
347 | Inst = std::move(Res); | |||
348 | return; | |||
349 | } | |||
350 | ||||
351 | // The rest of instructions we're relaxing have the same operands. | |||
352 | // We just need to update to the proper opcode. | |||
353 | Inst.setOpcode(RelaxedOp); | |||
354 | } | |||
355 | ||||
356 | bool ARMAsmBackend::writeNopData(raw_ostream &OS, uint64_t Count) const { | |||
357 | const uint16_t Thumb1_16bitNopEncoding = 0x46c0; // using MOV r8,r8 | |||
358 | const uint16_t Thumb2_16bitNopEncoding = 0xbf00; // NOP | |||
359 | const uint32_t ARMv4_NopEncoding = 0xe1a00000; // using MOV r0,r0 | |||
360 | const uint32_t ARMv6T2_NopEncoding = 0xe320f000; // NOP | |||
361 | if (isThumb()) { | |||
362 | const uint16_t nopEncoding = | |||
363 | hasNOP() ? Thumb2_16bitNopEncoding : Thumb1_16bitNopEncoding; | |||
364 | uint64_t NumNops = Count / 2; | |||
365 | for (uint64_t i = 0; i != NumNops; ++i) | |||
366 | support::endian::write(OS, nopEncoding, Endian); | |||
367 | if (Count & 1) | |||
368 | OS << '\0'; | |||
369 | return true; | |||
370 | } | |||
371 | // ARM mode | |||
372 | const uint32_t nopEncoding = | |||
373 | hasNOP() ? ARMv6T2_NopEncoding : ARMv4_NopEncoding; | |||
374 | uint64_t NumNops = Count / 4; | |||
375 | for (uint64_t i = 0; i != NumNops; ++i) | |||
376 | support::endian::write(OS, nopEncoding, Endian); | |||
377 | // FIXME: should this function return false when unable to write exactly | |||
378 | // 'Count' bytes with NOP encodings? | |||
379 | switch (Count % 4) { | |||
380 | default: | |||
381 | break; // No leftover bytes to write | |||
382 | case 1: | |||
383 | OS << '\0'; | |||
384 | break; | |||
385 | case 2: | |||
386 | OS.write("\0\0", 2); | |||
387 | break; | |||
388 | case 3: | |||
389 | OS.write("\0\0\xa0", 3); | |||
390 | break; | |||
391 | } | |||
392 | ||||
393 | return true; | |||
394 | } | |||
395 | ||||
396 | static uint32_t swapHalfWords(uint32_t Value, bool IsLittleEndian) { | |||
397 | if (IsLittleEndian) { | |||
398 | // Note that the halfwords are stored high first and low second in thumb; | |||
399 | // so we need to swap the fixup value here to map properly. | |||
400 | uint32_t Swapped = (Value & 0xFFFF0000) >> 16; | |||
401 | Swapped |= (Value & 0x0000FFFF) << 16; | |||
402 | return Swapped; | |||
403 | } else | |||
404 | return Value; | |||
405 | } | |||
406 | ||||
407 | static uint32_t joinHalfWords(uint32_t FirstHalf, uint32_t SecondHalf, | |||
408 | bool IsLittleEndian) { | |||
409 | uint32_t Value; | |||
410 | ||||
411 | if (IsLittleEndian) { | |||
412 | Value = (SecondHalf & 0xFFFF) << 16; | |||
413 | Value |= (FirstHalf & 0xFFFF); | |||
414 | } else { | |||
415 | Value = (SecondHalf & 0xFFFF); | |||
416 | Value |= (FirstHalf & 0xFFFF) << 16; | |||
417 | } | |||
418 | ||||
419 | return Value; | |||
420 | } | |||
421 | ||||
422 | unsigned ARMAsmBackend::adjustFixupValue(const MCAssembler &Asm, | |||
423 | const MCFixup &Fixup, | |||
424 | const MCValue &Target, uint64_t Value, | |||
425 | bool IsResolved, MCContext &Ctx, | |||
426 | const MCSubtargetInfo* STI) const { | |||
427 | unsigned Kind = Fixup.getKind(); | |||
428 | ||||
429 | // MachO tries to make .o files that look vaguely pre-linked, so for MOVW/MOVT | |||
430 | // and .word relocations they put the Thumb bit into the addend if possible. | |||
431 | // Other relocation types don't want this bit though (branches couldn't encode | |||
432 | // it if it *was* present, and no other relocations exist) and it can | |||
433 | // interfere with checking valid expressions. | |||
434 | if (const MCSymbolRefExpr *A = Target.getSymA()) { | |||
435 | if (A->hasSubsectionsViaSymbols() && Asm.isThumbFunc(&A->getSymbol()) && | |||
436 | A->getSymbol().isExternal() && | |||
437 | (Kind == FK_Data_4 || Kind == ARM::fixup_arm_movw_lo16 || | |||
438 | Kind == ARM::fixup_arm_movt_hi16 || Kind == ARM::fixup_t2_movw_lo16 || | |||
439 | Kind == ARM::fixup_t2_movt_hi16)) | |||
440 | Value |= 1; | |||
441 | } | |||
442 | ||||
443 | switch (Kind) { | |||
444 | default: | |||
445 | Ctx.reportError(Fixup.getLoc(), "bad relocation fixup type"); | |||
446 | return 0; | |||
447 | case FK_Data_1: | |||
448 | case FK_Data_2: | |||
449 | case FK_Data_4: | |||
450 | return Value; | |||
451 | case FK_SecRel_2: | |||
452 | return Value; | |||
453 | case FK_SecRel_4: | |||
454 | return Value; | |||
455 | case ARM::fixup_arm_movt_hi16: | |||
456 | assert(STI != nullptr)((STI != nullptr) ? static_cast<void> (0) : __assert_fail ("STI != nullptr", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 456, __PRETTY_FUNCTION__)); | |||
457 | if (IsResolved || !STI->getTargetTriple().isOSBinFormatELF()) | |||
458 | Value >>= 16; | |||
459 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
460 | case ARM::fixup_arm_movw_lo16: { | |||
461 | unsigned Hi4 = (Value & 0xF000) >> 12; | |||
462 | unsigned Lo12 = Value & 0x0FFF; | |||
463 | // inst{19-16} = Hi4; | |||
464 | // inst{11-0} = Lo12; | |||
465 | Value = (Hi4 << 16) | (Lo12); | |||
466 | return Value; | |||
467 | } | |||
468 | case ARM::fixup_t2_movt_hi16: | |||
469 | assert(STI != nullptr)((STI != nullptr) ? static_cast<void> (0) : __assert_fail ("STI != nullptr", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 469, __PRETTY_FUNCTION__)); | |||
470 | if (IsResolved || !STI->getTargetTriple().isOSBinFormatELF()) | |||
471 | Value >>= 16; | |||
472 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
473 | case ARM::fixup_t2_movw_lo16: { | |||
474 | unsigned Hi4 = (Value & 0xF000) >> 12; | |||
475 | unsigned i = (Value & 0x800) >> 11; | |||
476 | unsigned Mid3 = (Value & 0x700) >> 8; | |||
477 | unsigned Lo8 = Value & 0x0FF; | |||
478 | // inst{19-16} = Hi4; | |||
479 | // inst{26} = i; | |||
480 | // inst{14-12} = Mid3; | |||
481 | // inst{7-0} = Lo8; | |||
482 | Value = (Hi4 << 16) | (i << 26) | (Mid3 << 12) | (Lo8); | |||
483 | return swapHalfWords(Value, Endian == support::little); | |||
484 | } | |||
485 | case ARM::fixup_arm_ldst_pcrel_12: | |||
486 | // ARM PC-relative values are offset by 8. | |||
487 | Value -= 4; | |||
488 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
489 | case ARM::fixup_t2_ldst_pcrel_12: { | |||
490 | // Offset by 4, adjusted by two due to the half-word ordering of thumb. | |||
491 | Value -= 4; | |||
492 | bool isAdd = true; | |||
493 | if ((int64_t)Value < 0) { | |||
494 | Value = -Value; | |||
495 | isAdd = false; | |||
496 | } | |||
497 | if (Value >= 4096) { | |||
498 | Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value"); | |||
499 | return 0; | |||
500 | } | |||
501 | Value |= isAdd << 23; | |||
502 | ||||
503 | // Same addressing mode as fixup_arm_pcrel_10, | |||
504 | // but with 16-bit halfwords swapped. | |||
505 | if (Kind == ARM::fixup_t2_ldst_pcrel_12) | |||
506 | return swapHalfWords(Value, Endian == support::little); | |||
507 | ||||
508 | return Value; | |||
509 | } | |||
510 | case ARM::fixup_arm_adr_pcrel_12: { | |||
511 | // ARM PC-relative values are offset by 8. | |||
512 | Value -= 8; | |||
513 | unsigned opc = 4; // bits {24-21}. Default to add: 0b0100 | |||
514 | if ((int64_t)Value < 0) { | |||
515 | Value = -Value; | |||
516 | opc = 2; // 0b0010 | |||
517 | } | |||
518 | if (ARM_AM::getSOImmVal(Value) == -1) { | |||
519 | Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value"); | |||
520 | return 0; | |||
521 | } | |||
522 | // Encode the immediate and shift the opcode into place. | |||
523 | return ARM_AM::getSOImmVal(Value) | (opc << 21); | |||
524 | } | |||
525 | ||||
526 | case ARM::fixup_t2_adr_pcrel_12: { | |||
527 | Value -= 4; | |||
528 | unsigned opc = 0; | |||
529 | if ((int64_t)Value < 0) { | |||
530 | Value = -Value; | |||
531 | opc = 5; | |||
532 | } | |||
533 | ||||
534 | uint32_t out = (opc << 21); | |||
535 | out |= (Value & 0x800) << 15; | |||
536 | out |= (Value & 0x700) << 4; | |||
537 | out |= (Value & 0x0FF); | |||
538 | ||||
539 | return swapHalfWords(out, Endian == support::little); | |||
540 | } | |||
541 | ||||
542 | case ARM::fixup_arm_condbranch: | |||
543 | case ARM::fixup_arm_uncondbranch: | |||
544 | case ARM::fixup_arm_uncondbl: | |||
545 | case ARM::fixup_arm_condbl: | |||
546 | case ARM::fixup_arm_blx: | |||
547 | // These values don't encode the low two bits since they're always zero. | |||
548 | // Offset by 8 just as above. | |||
549 | if (const MCSymbolRefExpr *SRE = | |||
550 | dyn_cast<MCSymbolRefExpr>(Fixup.getValue())) | |||
551 | if (SRE->getKind() == MCSymbolRefExpr::VK_TLSCALL) | |||
552 | return 0; | |||
553 | return 0xffffff & ((Value - 8) >> 2); | |||
554 | case ARM::fixup_t2_uncondbranch: { | |||
555 | Value = Value - 4; | |||
556 | if (!isInt<25>(Value)) { | |||
557 | Ctx.reportError(Fixup.getLoc(), "Relocation out of range"); | |||
558 | return 0; | |||
559 | } | |||
560 | ||||
561 | Value >>= 1; // Low bit is not encoded. | |||
562 | ||||
563 | uint32_t out = 0; | |||
564 | bool I = Value & 0x800000; | |||
565 | bool J1 = Value & 0x400000; | |||
566 | bool J2 = Value & 0x200000; | |||
567 | J1 ^= I; | |||
568 | J2 ^= I; | |||
569 | ||||
570 | out |= I << 26; // S bit | |||
571 | out |= !J1 << 13; // J1 bit | |||
572 | out |= !J2 << 11; // J2 bit | |||
573 | out |= (Value & 0x1FF800) << 5; // imm6 field | |||
574 | out |= (Value & 0x0007FF); // imm11 field | |||
575 | ||||
576 | return swapHalfWords(out, Endian == support::little); | |||
577 | } | |||
578 | case ARM::fixup_t2_condbranch: { | |||
579 | Value = Value - 4; | |||
580 | if (!isInt<21>(Value)) { | |||
581 | Ctx.reportError(Fixup.getLoc(), "Relocation out of range"); | |||
582 | return 0; | |||
583 | } | |||
584 | ||||
585 | Value >>= 1; // Low bit is not encoded. | |||
586 | ||||
587 | uint64_t out = 0; | |||
588 | out |= (Value & 0x80000) << 7; // S bit | |||
589 | out |= (Value & 0x40000) >> 7; // J2 bit | |||
590 | out |= (Value & 0x20000) >> 4; // J1 bit | |||
591 | out |= (Value & 0x1F800) << 5; // imm6 field | |||
592 | out |= (Value & 0x007FF); // imm11 field | |||
593 | ||||
594 | return swapHalfWords(out, Endian == support::little); | |||
595 | } | |||
596 | case ARM::fixup_arm_thumb_bl: { | |||
597 | if (!isInt<25>(Value - 4) || | |||
598 | (!STI->getFeatureBits()[ARM::FeatureThumb2] && | |||
599 | !STI->getFeatureBits()[ARM::HasV8MBaselineOps] && | |||
600 | !STI->getFeatureBits()[ARM::HasV6MOps] && | |||
601 | !isInt<23>(Value - 4))) { | |||
602 | Ctx.reportError(Fixup.getLoc(), "Relocation out of range"); | |||
603 | return 0; | |||
604 | } | |||
605 | ||||
606 | // The value doesn't encode the low bit (always zero) and is offset by | |||
607 | // four. The 32-bit immediate value is encoded as | |||
608 | // imm32 = SignExtend(S:I1:I2:imm10:imm11:0) | |||
609 | // where I1 = NOT(J1 ^ S) and I2 = NOT(J2 ^ S). | |||
610 | // The value is encoded into disjoint bit positions in the destination | |||
611 | // opcode. x = unchanged, I = immediate value bit, S = sign extension bit, | |||
612 | // J = either J1 or J2 bit | |||
613 | // | |||
614 | // BL: xxxxxSIIIIIIIIII xxJxJIIIIIIIIIII | |||
615 | // | |||
616 | // Note that the halfwords are stored high first, low second; so we need | |||
617 | // to transpose the fixup value here to map properly. | |||
618 | uint32_t offset = (Value - 4) >> 1; | |||
619 | uint32_t signBit = (offset & 0x800000) >> 23; | |||
620 | uint32_t I1Bit = (offset & 0x400000) >> 22; | |||
621 | uint32_t J1Bit = (I1Bit ^ 0x1) ^ signBit; | |||
622 | uint32_t I2Bit = (offset & 0x200000) >> 21; | |||
623 | uint32_t J2Bit = (I2Bit ^ 0x1) ^ signBit; | |||
624 | uint32_t imm10Bits = (offset & 0x1FF800) >> 11; | |||
625 | uint32_t imm11Bits = (offset & 0x000007FF); | |||
626 | ||||
627 | uint32_t FirstHalf = (((uint16_t)signBit << 10) | (uint16_t)imm10Bits); | |||
628 | uint32_t SecondHalf = (((uint16_t)J1Bit << 13) | ((uint16_t)J2Bit << 11) | | |||
629 | (uint16_t)imm11Bits); | |||
630 | return joinHalfWords(FirstHalf, SecondHalf, Endian == support::little); | |||
631 | } | |||
632 | case ARM::fixup_arm_thumb_blx: { | |||
633 | // The value doesn't encode the low two bits (always zero) and is offset by | |||
634 | // four (see fixup_arm_thumb_cp). The 32-bit immediate value is encoded as | |||
635 | // imm32 = SignExtend(S:I1:I2:imm10H:imm10L:00) | |||
636 | // where I1 = NOT(J1 ^ S) and I2 = NOT(J2 ^ S). | |||
637 | // The value is encoded into disjoint bit positions in the destination | |||
638 | // opcode. x = unchanged, I = immediate value bit, S = sign extension bit, | |||
639 | // J = either J1 or J2 bit, 0 = zero. | |||
640 | // | |||
641 | // BLX: xxxxxSIIIIIIIIII xxJxJIIIIIIIIII0 | |||
642 | // | |||
643 | // Note that the halfwords are stored high first, low second; so we need | |||
644 | // to transpose the fixup value here to map properly. | |||
645 | if (Value % 4 != 0) { | |||
646 | Ctx.reportError(Fixup.getLoc(), "misaligned ARM call destination"); | |||
647 | return 0; | |||
648 | } | |||
649 | ||||
650 | uint32_t offset = (Value - 4) >> 2; | |||
651 | if (const MCSymbolRefExpr *SRE = | |||
652 | dyn_cast<MCSymbolRefExpr>(Fixup.getValue())) | |||
653 | if (SRE->getKind() == MCSymbolRefExpr::VK_TLSCALL) | |||
654 | offset = 0; | |||
655 | uint32_t signBit = (offset & 0x400000) >> 22; | |||
656 | uint32_t I1Bit = (offset & 0x200000) >> 21; | |||
657 | uint32_t J1Bit = (I1Bit ^ 0x1) ^ signBit; | |||
658 | uint32_t I2Bit = (offset & 0x100000) >> 20; | |||
659 | uint32_t J2Bit = (I2Bit ^ 0x1) ^ signBit; | |||
660 | uint32_t imm10HBits = (offset & 0xFFC00) >> 10; | |||
661 | uint32_t imm10LBits = (offset & 0x3FF); | |||
662 | ||||
663 | uint32_t FirstHalf = (((uint16_t)signBit << 10) | (uint16_t)imm10HBits); | |||
664 | uint32_t SecondHalf = (((uint16_t)J1Bit << 13) | ((uint16_t)J2Bit << 11) | | |||
665 | ((uint16_t)imm10LBits) << 1); | |||
666 | return joinHalfWords(FirstHalf, SecondHalf, Endian == support::little); | |||
667 | } | |||
668 | case ARM::fixup_thumb_adr_pcrel_10: | |||
669 | case ARM::fixup_arm_thumb_cp: | |||
670 | // On CPUs supporting Thumb2, this will be relaxed to an ldr.w, otherwise we | |||
671 | // could have an error on our hands. | |||
672 | assert(STI != nullptr)((STI != nullptr) ? static_cast<void> (0) : __assert_fail ("STI != nullptr", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 672, __PRETTY_FUNCTION__)); | |||
673 | if (!STI->getFeatureBits()[ARM::FeatureThumb2] && IsResolved) { | |||
674 | const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value); | |||
675 | if (FixupDiagnostic) { | |||
676 | Ctx.reportError(Fixup.getLoc(), FixupDiagnostic); | |||
677 | return 0; | |||
678 | } | |||
679 | } | |||
680 | // Offset by 4, and don't encode the low two bits. | |||
681 | return ((Value - 4) >> 2) & 0xff; | |||
682 | case ARM::fixup_arm_thumb_cb: { | |||
683 | // CB instructions can only branch to offsets in [4, 126] in multiples of 2 | |||
684 | // so ensure that the raw value LSB is zero and it lies in [2, 130]. | |||
685 | // An offset of 2 will be relaxed to a NOP. | |||
686 | if ((int64_t)Value < 2 || Value > 0x82 || Value & 1) { | |||
687 | Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value"); | |||
688 | return 0; | |||
689 | } | |||
690 | // Offset by 4 and don't encode the lower bit, which is always 0. | |||
691 | // FIXME: diagnose if no Thumb2 | |||
692 | uint32_t Binary = (Value - 4) >> 1; | |||
693 | return ((Binary & 0x20) << 4) | ((Binary & 0x1f) << 3); | |||
694 | } | |||
695 | case ARM::fixup_arm_thumb_br: | |||
696 | // Offset by 4 and don't encode the lower bit, which is always 0. | |||
697 | assert(STI != nullptr)((STI != nullptr) ? static_cast<void> (0) : __assert_fail ("STI != nullptr", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 697, __PRETTY_FUNCTION__)); | |||
698 | if (!STI->getFeatureBits()[ARM::FeatureThumb2] && | |||
699 | !STI->getFeatureBits()[ARM::HasV8MBaselineOps]) { | |||
700 | const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value); | |||
701 | if (FixupDiagnostic) { | |||
702 | Ctx.reportError(Fixup.getLoc(), FixupDiagnostic); | |||
703 | return 0; | |||
704 | } | |||
705 | } | |||
706 | return ((Value - 4) >> 1) & 0x7ff; | |||
707 | case ARM::fixup_arm_thumb_bcc: | |||
708 | // Offset by 4 and don't encode the lower bit, which is always 0. | |||
709 | assert(STI != nullptr)((STI != nullptr) ? static_cast<void> (0) : __assert_fail ("STI != nullptr", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 709, __PRETTY_FUNCTION__)); | |||
710 | if (!STI->getFeatureBits()[ARM::FeatureThumb2]) { | |||
711 | const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value); | |||
712 | if (FixupDiagnostic) { | |||
713 | Ctx.reportError(Fixup.getLoc(), FixupDiagnostic); | |||
714 | return 0; | |||
715 | } | |||
716 | } | |||
717 | return ((Value - 4) >> 1) & 0xff; | |||
718 | case ARM::fixup_arm_pcrel_10_unscaled: { | |||
719 | Value = Value - 8; // ARM fixups offset by an additional word and don't | |||
720 | // need to adjust for the half-word ordering. | |||
721 | bool isAdd = true; | |||
722 | if ((int64_t)Value < 0) { | |||
723 | Value = -Value; | |||
724 | isAdd = false; | |||
725 | } | |||
726 | // The value has the low 4 bits encoded in [3:0] and the high 4 in [11:8]. | |||
727 | if (Value >= 256) { | |||
728 | Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value"); | |||
729 | return 0; | |||
730 | } | |||
731 | Value = (Value & 0xf) | ((Value & 0xf0) << 4); | |||
732 | return Value | (isAdd << 23); | |||
733 | } | |||
734 | case ARM::fixup_arm_pcrel_10: | |||
735 | Value = Value - 4; // ARM fixups offset by an additional word and don't | |||
736 | // need to adjust for the half-word ordering. | |||
737 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
738 | case ARM::fixup_t2_pcrel_10: { | |||
739 | // Offset by 4, adjusted by two due to the half-word ordering of thumb. | |||
740 | Value = Value - 4; | |||
741 | bool isAdd = true; | |||
742 | if ((int64_t)Value < 0) { | |||
743 | Value = -Value; | |||
744 | isAdd = false; | |||
745 | } | |||
746 | // These values don't encode the low two bits since they're always zero. | |||
747 | Value >>= 2; | |||
748 | if (Value >= 256) { | |||
749 | Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value"); | |||
750 | return 0; | |||
751 | } | |||
752 | Value |= isAdd << 23; | |||
753 | ||||
754 | // Same addressing mode as fixup_arm_pcrel_10, but with 16-bit halfwords | |||
755 | // swapped. | |||
756 | if (Kind == ARM::fixup_t2_pcrel_10) | |||
757 | return swapHalfWords(Value, Endian == support::little); | |||
758 | ||||
759 | return Value; | |||
760 | } | |||
761 | case ARM::fixup_arm_pcrel_9: | |||
762 | Value = Value - 4; // ARM fixups offset by an additional word and don't | |||
763 | // need to adjust for the half-word ordering. | |||
764 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
765 | case ARM::fixup_t2_pcrel_9: { | |||
766 | // Offset by 4, adjusted by two due to the half-word ordering of thumb. | |||
767 | Value = Value - 4; | |||
768 | bool isAdd = true; | |||
769 | if ((int64_t)Value < 0) { | |||
770 | Value = -Value; | |||
771 | isAdd = false; | |||
772 | } | |||
773 | // These values don't encode the low bit since it's always zero. | |||
774 | if (Value & 1) { | |||
775 | Ctx.reportError(Fixup.getLoc(), "invalid value for this fixup"); | |||
776 | return 0; | |||
777 | } | |||
778 | Value >>= 1; | |||
779 | if (Value >= 256) { | |||
780 | Ctx.reportError(Fixup.getLoc(), "out of range pc-relative fixup value"); | |||
781 | return 0; | |||
782 | } | |||
783 | Value |= isAdd << 23; | |||
784 | ||||
785 | // Same addressing mode as fixup_arm_pcrel_9, but with 16-bit halfwords | |||
786 | // swapped. | |||
787 | if (Kind == ARM::fixup_t2_pcrel_9) | |||
788 | return swapHalfWords(Value, Endian == support::little); | |||
789 | ||||
790 | return Value; | |||
791 | } | |||
792 | case ARM::fixup_arm_mod_imm: | |||
793 | Value = ARM_AM::getSOImmVal(Value); | |||
794 | if (Value >> 12) { | |||
795 | Ctx.reportError(Fixup.getLoc(), "out of range immediate fixup value"); | |||
796 | return 0; | |||
797 | } | |||
798 | return Value; | |||
799 | case ARM::fixup_t2_so_imm: { | |||
800 | Value = ARM_AM::getT2SOImmVal(Value); | |||
801 | if ((int64_t)Value < 0) { | |||
802 | Ctx.reportError(Fixup.getLoc(), "out of range immediate fixup value"); | |||
803 | return 0; | |||
804 | } | |||
805 | // Value will contain a 12-bit value broken up into a 4-bit shift in bits | |||
806 | // 11:8 and the 8-bit immediate in 0:7. The instruction has the immediate | |||
807 | // in 0:7. The 4-bit shift is split up into i:imm3 where i is placed at bit | |||
808 | // 10 of the upper half-word and imm3 is placed at 14:12 of the lower | |||
809 | // half-word. | |||
810 | uint64_t EncValue = 0; | |||
811 | EncValue |= (Value & 0x800) << 15; | |||
812 | EncValue |= (Value & 0x700) << 4; | |||
813 | EncValue |= (Value & 0xff); | |||
814 | return swapHalfWords(EncValue, Endian == support::little); | |||
815 | } | |||
816 | case ARM::fixup_bf_branch: { | |||
817 | const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value); | |||
818 | if (FixupDiagnostic) { | |||
819 | Ctx.reportError(Fixup.getLoc(), FixupDiagnostic); | |||
820 | return 0; | |||
821 | } | |||
822 | uint32_t out = (((Value - 4) >> 1) & 0xf) << 23; | |||
823 | return swapHalfWords(out, Endian == support::little); | |||
824 | } | |||
825 | case ARM::fixup_bf_target: | |||
826 | case ARM::fixup_bfl_target: | |||
827 | case ARM::fixup_bfc_target: { | |||
828 | const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value); | |||
829 | if (FixupDiagnostic) { | |||
830 | Ctx.reportError(Fixup.getLoc(), FixupDiagnostic); | |||
831 | return 0; | |||
832 | } | |||
833 | uint32_t out = 0; | |||
834 | uint32_t HighBitMask = (Kind == ARM::fixup_bf_target ? 0xf800 : | |||
835 | Kind == ARM::fixup_bfl_target ? 0x3f800 : 0x800); | |||
836 | out |= (((Value - 4) >> 1) & 0x1) << 11; | |||
837 | out |= (((Value - 4) >> 1) & 0x7fe); | |||
838 | out |= (((Value - 4) >> 1) & HighBitMask) << 5; | |||
839 | return swapHalfWords(out, Endian == support::little); | |||
840 | } | |||
841 | case ARM::fixup_bfcsel_else_target: { | |||
842 | // If this is a fixup of a branch future's else target then it should be a | |||
843 | // constant MCExpr representing the distance between the branch targetted | |||
844 | // and the instruction after that same branch. | |||
845 | Value = Target.getConstant(); | |||
846 | ||||
847 | const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value); | |||
848 | if (FixupDiagnostic) { | |||
849 | Ctx.reportError(Fixup.getLoc(), FixupDiagnostic); | |||
850 | return 0; | |||
851 | } | |||
852 | uint32_t out = ((Value >> 2) & 1) << 17; | |||
853 | return swapHalfWords(out, Endian == support::little); | |||
854 | } | |||
855 | case ARM::fixup_wls: | |||
856 | case ARM::fixup_le: { | |||
857 | const char *FixupDiagnostic = reasonForFixupRelaxation(Fixup, Value); | |||
858 | if (FixupDiagnostic) { | |||
859 | Ctx.reportError(Fixup.getLoc(), FixupDiagnostic); | |||
860 | return 0; | |||
861 | } | |||
862 | uint64_t real_value = Value - 4; | |||
863 | uint32_t out = 0; | |||
864 | if (Kind == ARM::fixup_le) | |||
865 | real_value = -real_value; | |||
866 | out |= ((real_value >> 1) & 0x1) << 11; | |||
867 | out |= ((real_value >> 1) & 0x7fe); | |||
868 | return swapHalfWords(out, Endian == support::little); | |||
869 | } | |||
870 | } | |||
871 | } | |||
872 | ||||
873 | bool ARMAsmBackend::shouldForceRelocation(const MCAssembler &Asm, | |||
874 | const MCFixup &Fixup, | |||
875 | const MCValue &Target) { | |||
876 | const MCSymbolRefExpr *A = Target.getSymA(); | |||
877 | const MCSymbol *Sym = A ? &A->getSymbol() : nullptr; | |||
878 | const unsigned FixupKind = Fixup.getKind(); | |||
879 | if (FixupKind >= FirstLiteralRelocationKind) | |||
880 | return true; | |||
881 | if (FixupKind == ARM::fixup_arm_thumb_bl) { | |||
882 | assert(Sym && "How did we resolve this?")((Sym && "How did we resolve this?") ? static_cast< void> (0) : __assert_fail ("Sym && \"How did we resolve this?\"" , "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 882, __PRETTY_FUNCTION__)); | |||
883 | ||||
884 | // If the symbol is external the linker will handle it. | |||
885 | // FIXME: Should we handle it as an optimization? | |||
886 | ||||
887 | // If the symbol is out of range, produce a relocation and hope the | |||
888 | // linker can handle it. GNU AS produces an error in this case. | |||
889 | if (Sym->isExternal()) | |||
890 | return true; | |||
891 | } | |||
892 | // Create relocations for unconditional branches to function symbols with | |||
893 | // different execution mode in ELF binaries. | |||
894 | if (Sym && Sym->isELF()) { | |||
895 | unsigned Type = cast<MCSymbolELF>(Sym)->getType(); | |||
896 | if ((Type == ELF::STT_FUNC || Type == ELF::STT_GNU_IFUNC)) { | |||
897 | if (Asm.isThumbFunc(Sym) && (FixupKind == ARM::fixup_arm_uncondbranch)) | |||
898 | return true; | |||
899 | if (!Asm.isThumbFunc(Sym) && (FixupKind == ARM::fixup_arm_thumb_br || | |||
900 | FixupKind == ARM::fixup_arm_thumb_bl || | |||
901 | FixupKind == ARM::fixup_t2_condbranch || | |||
902 | FixupKind == ARM::fixup_t2_uncondbranch)) | |||
903 | return true; | |||
904 | } | |||
905 | } | |||
906 | // We must always generate a relocation for BL/BLX instructions if we have | |||
907 | // a symbol to reference, as the linker relies on knowing the destination | |||
908 | // symbol's thumb-ness to get interworking right. | |||
909 | if (A && (FixupKind == ARM::fixup_arm_thumb_blx || | |||
910 | FixupKind == ARM::fixup_arm_blx || | |||
911 | FixupKind == ARM::fixup_arm_uncondbl || | |||
912 | FixupKind == ARM::fixup_arm_condbl)) | |||
913 | return true; | |||
914 | return false; | |||
915 | } | |||
916 | ||||
917 | /// getFixupKindNumBytes - The number of bytes the fixup may change. | |||
918 | static unsigned getFixupKindNumBytes(unsigned Kind) { | |||
919 | switch (Kind) { | |||
920 | default: | |||
921 | llvm_unreachable("Unknown fixup kind!")::llvm::llvm_unreachable_internal("Unknown fixup kind!", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 921); | |||
922 | ||||
923 | case FK_Data_1: | |||
924 | case ARM::fixup_arm_thumb_bcc: | |||
925 | case ARM::fixup_arm_thumb_cp: | |||
926 | case ARM::fixup_thumb_adr_pcrel_10: | |||
927 | return 1; | |||
928 | ||||
929 | case FK_Data_2: | |||
930 | case ARM::fixup_arm_thumb_br: | |||
931 | case ARM::fixup_arm_thumb_cb: | |||
932 | case ARM::fixup_arm_mod_imm: | |||
933 | return 2; | |||
934 | ||||
935 | case ARM::fixup_arm_pcrel_10_unscaled: | |||
936 | case ARM::fixup_arm_ldst_pcrel_12: | |||
937 | case ARM::fixup_arm_pcrel_10: | |||
938 | case ARM::fixup_arm_pcrel_9: | |||
939 | case ARM::fixup_arm_adr_pcrel_12: | |||
940 | case ARM::fixup_arm_uncondbl: | |||
941 | case ARM::fixup_arm_condbl: | |||
942 | case ARM::fixup_arm_blx: | |||
943 | case ARM::fixup_arm_condbranch: | |||
944 | case ARM::fixup_arm_uncondbranch: | |||
945 | return 3; | |||
946 | ||||
947 | case FK_Data_4: | |||
948 | case ARM::fixup_t2_ldst_pcrel_12: | |||
949 | case ARM::fixup_t2_condbranch: | |||
950 | case ARM::fixup_t2_uncondbranch: | |||
951 | case ARM::fixup_t2_pcrel_10: | |||
952 | case ARM::fixup_t2_pcrel_9: | |||
953 | case ARM::fixup_t2_adr_pcrel_12: | |||
954 | case ARM::fixup_arm_thumb_bl: | |||
955 | case ARM::fixup_arm_thumb_blx: | |||
956 | case ARM::fixup_arm_movt_hi16: | |||
957 | case ARM::fixup_arm_movw_lo16: | |||
958 | case ARM::fixup_t2_movt_hi16: | |||
959 | case ARM::fixup_t2_movw_lo16: | |||
960 | case ARM::fixup_t2_so_imm: | |||
961 | case ARM::fixup_bf_branch: | |||
962 | case ARM::fixup_bf_target: | |||
963 | case ARM::fixup_bfl_target: | |||
964 | case ARM::fixup_bfc_target: | |||
965 | case ARM::fixup_bfcsel_else_target: | |||
966 | case ARM::fixup_wls: | |||
967 | case ARM::fixup_le: | |||
968 | return 4; | |||
969 | ||||
970 | case FK_SecRel_2: | |||
971 | return 2; | |||
972 | case FK_SecRel_4: | |||
973 | return 4; | |||
974 | } | |||
975 | } | |||
976 | ||||
977 | /// getFixupKindContainerSizeBytes - The number of bytes of the | |||
978 | /// container involved in big endian. | |||
979 | static unsigned getFixupKindContainerSizeBytes(unsigned Kind) { | |||
980 | switch (Kind) { | |||
981 | default: | |||
982 | llvm_unreachable("Unknown fixup kind!")::llvm::llvm_unreachable_internal("Unknown fixup kind!", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 982); | |||
983 | ||||
984 | case FK_Data_1: | |||
985 | return 1; | |||
986 | case FK_Data_2: | |||
987 | return 2; | |||
988 | case FK_Data_4: | |||
989 | return 4; | |||
990 | ||||
991 | case ARM::fixup_arm_thumb_bcc: | |||
992 | case ARM::fixup_arm_thumb_cp: | |||
993 | case ARM::fixup_thumb_adr_pcrel_10: | |||
994 | case ARM::fixup_arm_thumb_br: | |||
995 | case ARM::fixup_arm_thumb_cb: | |||
996 | // Instruction size is 2 bytes. | |||
997 | return 2; | |||
998 | ||||
999 | case ARM::fixup_arm_pcrel_10_unscaled: | |||
1000 | case ARM::fixup_arm_ldst_pcrel_12: | |||
1001 | case ARM::fixup_arm_pcrel_10: | |||
1002 | case ARM::fixup_arm_pcrel_9: | |||
1003 | case ARM::fixup_arm_adr_pcrel_12: | |||
1004 | case ARM::fixup_arm_uncondbl: | |||
1005 | case ARM::fixup_arm_condbl: | |||
1006 | case ARM::fixup_arm_blx: | |||
1007 | case ARM::fixup_arm_condbranch: | |||
1008 | case ARM::fixup_arm_uncondbranch: | |||
1009 | case ARM::fixup_t2_ldst_pcrel_12: | |||
1010 | case ARM::fixup_t2_condbranch: | |||
1011 | case ARM::fixup_t2_uncondbranch: | |||
1012 | case ARM::fixup_t2_pcrel_10: | |||
1013 | case ARM::fixup_t2_pcrel_9: | |||
1014 | case ARM::fixup_t2_adr_pcrel_12: | |||
1015 | case ARM::fixup_arm_thumb_bl: | |||
1016 | case ARM::fixup_arm_thumb_blx: | |||
1017 | case ARM::fixup_arm_movt_hi16: | |||
1018 | case ARM::fixup_arm_movw_lo16: | |||
1019 | case ARM::fixup_t2_movt_hi16: | |||
1020 | case ARM::fixup_t2_movw_lo16: | |||
1021 | case ARM::fixup_arm_mod_imm: | |||
1022 | case ARM::fixup_t2_so_imm: | |||
1023 | case ARM::fixup_bf_branch: | |||
1024 | case ARM::fixup_bf_target: | |||
1025 | case ARM::fixup_bfl_target: | |||
1026 | case ARM::fixup_bfc_target: | |||
1027 | case ARM::fixup_bfcsel_else_target: | |||
1028 | case ARM::fixup_wls: | |||
1029 | case ARM::fixup_le: | |||
1030 | // Instruction size is 4 bytes. | |||
1031 | return 4; | |||
1032 | } | |||
1033 | } | |||
1034 | ||||
1035 | void ARMAsmBackend::applyFixup(const MCAssembler &Asm, const MCFixup &Fixup, | |||
1036 | const MCValue &Target, | |||
1037 | MutableArrayRef<char> Data, uint64_t Value, | |||
1038 | bool IsResolved, | |||
1039 | const MCSubtargetInfo* STI) const { | |||
1040 | unsigned Kind = Fixup.getKind(); | |||
1041 | if (Kind >= FirstLiteralRelocationKind) | |||
| ||||
1042 | return; | |||
1043 | unsigned NumBytes = getFixupKindNumBytes(Kind); | |||
1044 | MCContext &Ctx = Asm.getContext(); | |||
1045 | Value = adjustFixupValue(Asm, Fixup, Target, Value, IsResolved, Ctx, STI); | |||
1046 | if (!Value) | |||
1047 | return; // Doesn't change encoding. | |||
1048 | ||||
1049 | unsigned Offset = Fixup.getOffset(); | |||
1050 | assert(Offset + NumBytes <= Data.size() && "Invalid fixup offset!")((Offset + NumBytes <= Data.size() && "Invalid fixup offset!" ) ? static_cast<void> (0) : __assert_fail ("Offset + NumBytes <= Data.size() && \"Invalid fixup offset!\"" , "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 1050, __PRETTY_FUNCTION__)); | |||
1051 | ||||
1052 | // Used to point to big endian bytes. | |||
1053 | unsigned FullSizeBytes; | |||
1054 | if (Endian == support::big) { | |||
1055 | FullSizeBytes = getFixupKindContainerSizeBytes(Kind); | |||
1056 | assert((Offset + FullSizeBytes) <= Data.size() && "Invalid fixup size!")(((Offset + FullSizeBytes) <= Data.size() && "Invalid fixup size!" ) ? static_cast<void> (0) : __assert_fail ("(Offset + FullSizeBytes) <= Data.size() && \"Invalid fixup size!\"" , "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 1056, __PRETTY_FUNCTION__)); | |||
1057 | assert(NumBytes <= FullSizeBytes && "Invalid fixup size!")((NumBytes <= FullSizeBytes && "Invalid fixup size!" ) ? static_cast<void> (0) : __assert_fail ("NumBytes <= FullSizeBytes && \"Invalid fixup size!\"" , "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 1057, __PRETTY_FUNCTION__)); | |||
1058 | } | |||
1059 | ||||
1060 | // For each byte of the fragment that the fixup touches, mask in the bits from | |||
1061 | // the fixup value. The Value has been "split up" into the appropriate | |||
1062 | // bitfields above. | |||
1063 | for (unsigned i = 0; i != NumBytes; ++i) { | |||
1064 | unsigned Idx = Endian == support::little ? i : (FullSizeBytes - 1 - i); | |||
| ||||
1065 | Data[Offset + Idx] |= uint8_t((Value >> (i * 8)) & 0xff); | |||
1066 | } | |||
1067 | } | |||
1068 | ||||
1069 | namespace CU { | |||
1070 | ||||
1071 | /// Compact unwind encoding values. | |||
1072 | enum CompactUnwindEncodings { | |||
1073 | UNWIND_ARM_MODE_MASK = 0x0F000000, | |||
1074 | UNWIND_ARM_MODE_FRAME = 0x01000000, | |||
1075 | UNWIND_ARM_MODE_FRAME_D = 0x02000000, | |||
1076 | UNWIND_ARM_MODE_DWARF = 0x04000000, | |||
1077 | ||||
1078 | UNWIND_ARM_FRAME_STACK_ADJUST_MASK = 0x00C00000, | |||
1079 | ||||
1080 | UNWIND_ARM_FRAME_FIRST_PUSH_R4 = 0x00000001, | |||
1081 | UNWIND_ARM_FRAME_FIRST_PUSH_R5 = 0x00000002, | |||
1082 | UNWIND_ARM_FRAME_FIRST_PUSH_R6 = 0x00000004, | |||
1083 | ||||
1084 | UNWIND_ARM_FRAME_SECOND_PUSH_R8 = 0x00000008, | |||
1085 | UNWIND_ARM_FRAME_SECOND_PUSH_R9 = 0x00000010, | |||
1086 | UNWIND_ARM_FRAME_SECOND_PUSH_R10 = 0x00000020, | |||
1087 | UNWIND_ARM_FRAME_SECOND_PUSH_R11 = 0x00000040, | |||
1088 | UNWIND_ARM_FRAME_SECOND_PUSH_R12 = 0x00000080, | |||
1089 | ||||
1090 | UNWIND_ARM_FRAME_D_REG_COUNT_MASK = 0x00000F00, | |||
1091 | ||||
1092 | UNWIND_ARM_DWARF_SECTION_OFFSET = 0x00FFFFFF | |||
1093 | }; | |||
1094 | ||||
1095 | } // end CU namespace | |||
1096 | ||||
1097 | /// Generate compact unwind encoding for the function based on the CFI | |||
1098 | /// instructions. If the CFI instructions describe a frame that cannot be | |||
1099 | /// encoded in compact unwind, the method returns UNWIND_ARM_MODE_DWARF which | |||
1100 | /// tells the runtime to fallback and unwind using dwarf. | |||
1101 | uint32_t ARMAsmBackendDarwin::generateCompactUnwindEncoding( | |||
1102 | ArrayRef<MCCFIInstruction> Instrs) const { | |||
1103 | DEBUG_WITH_TYPE("compact-unwind", llvm::dbgs() << "generateCU()\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "generateCU()\n"; } } while (false); | |||
1104 | // Only armv7k uses CFI based unwinding. | |||
1105 | if (Subtype != MachO::CPU_SUBTYPE_ARM_V7K) | |||
1106 | return 0; | |||
1107 | // No .cfi directives means no frame. | |||
1108 | if (Instrs.empty()) | |||
1109 | return 0; | |||
1110 | // Start off assuming CFA is at SP+0. | |||
1111 | unsigned CFARegister = ARM::SP; | |||
1112 | int CFARegisterOffset = 0; | |||
1113 | // Mark savable registers as initially unsaved | |||
1114 | DenseMap<unsigned, int> RegOffsets; | |||
1115 | int FloatRegCount = 0; | |||
1116 | // Process each .cfi directive and build up compact unwind info. | |||
1117 | for (size_t i = 0, e = Instrs.size(); i != e; ++i) { | |||
1118 | unsigned Reg; | |||
1119 | const MCCFIInstruction &Inst = Instrs[i]; | |||
1120 | switch (Inst.getOperation()) { | |||
1121 | case MCCFIInstruction::OpDefCfa: // DW_CFA_def_cfa | |||
1122 | CFARegisterOffset = Inst.getOffset(); | |||
1123 | CFARegister = *MRI.getLLVMRegNum(Inst.getRegister(), true); | |||
1124 | break; | |||
1125 | case MCCFIInstruction::OpDefCfaOffset: // DW_CFA_def_cfa_offset | |||
1126 | CFARegisterOffset = Inst.getOffset(); | |||
1127 | break; | |||
1128 | case MCCFIInstruction::OpDefCfaRegister: // DW_CFA_def_cfa_register | |||
1129 | CFARegister = *MRI.getLLVMRegNum(Inst.getRegister(), true); | |||
1130 | break; | |||
1131 | case MCCFIInstruction::OpOffset: // DW_CFA_offset | |||
1132 | Reg = *MRI.getLLVMRegNum(Inst.getRegister(), true); | |||
1133 | if (ARMMCRegisterClasses[ARM::GPRRegClassID].contains(Reg)) | |||
1134 | RegOffsets[Reg] = Inst.getOffset(); | |||
1135 | else if (ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg)) { | |||
1136 | RegOffsets[Reg] = Inst.getOffset(); | |||
1137 | ++FloatRegCount; | |||
1138 | } else { | |||
1139 | DEBUG_WITH_TYPE("compact-unwind",do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << ".cfi_offset on unknown register=" << Inst.getRegister() << "\n"; } } while (false) | |||
1140 | llvm::dbgs() << ".cfi_offset on unknown register="do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << ".cfi_offset on unknown register=" << Inst.getRegister() << "\n"; } } while (false) | |||
1141 | << Inst.getRegister() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << ".cfi_offset on unknown register=" << Inst.getRegister() << "\n"; } } while (false); | |||
1142 | return CU::UNWIND_ARM_MODE_DWARF; | |||
1143 | } | |||
1144 | break; | |||
1145 | case MCCFIInstruction::OpRelOffset: // DW_CFA_advance_loc | |||
1146 | // Ignore | |||
1147 | break; | |||
1148 | default: | |||
1149 | // Directive not convertable to compact unwind, bail out. | |||
1150 | DEBUG_WITH_TYPE("compact-unwind",do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "CFI directive not compatiable with comact " "unwind encoding, opcode=" << Inst.getOperation() << "\n"; } } while (false) | |||
1151 | llvm::dbgs()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "CFI directive not compatiable with comact " "unwind encoding, opcode=" << Inst.getOperation() << "\n"; } } while (false) | |||
1152 | << "CFI directive not compatiable with comact "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "CFI directive not compatiable with comact " "unwind encoding, opcode=" << Inst.getOperation() << "\n"; } } while (false) | |||
1153 | "unwind encoding, opcode=" << Inst.getOperation()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "CFI directive not compatiable with comact " "unwind encoding, opcode=" << Inst.getOperation() << "\n"; } } while (false) | |||
1154 | << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "CFI directive not compatiable with comact " "unwind encoding, opcode=" << Inst.getOperation() << "\n"; } } while (false); | |||
1155 | return CU::UNWIND_ARM_MODE_DWARF; | |||
1156 | break; | |||
1157 | } | |||
1158 | } | |||
1159 | ||||
1160 | // If no frame set up, return no unwind info. | |||
1161 | if ((CFARegister == ARM::SP) && (CFARegisterOffset == 0)) | |||
1162 | return 0; | |||
1163 | ||||
1164 | // Verify standard frame (lr/r7) was used. | |||
1165 | if (CFARegister != ARM::R7) { | |||
1166 | DEBUG_WITH_TYPE("compact-unwind", llvm::dbgs() << "frame register is "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "frame register is " << CFARegister << " instead of r7\n"; } } while ( false) | |||
1167 | << CFARegisterdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "frame register is " << CFARegister << " instead of r7\n"; } } while ( false) | |||
1168 | << " instead of r7\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "frame register is " << CFARegister << " instead of r7\n"; } } while ( false); | |||
1169 | return CU::UNWIND_ARM_MODE_DWARF; | |||
1170 | } | |||
1171 | int StackAdjust = CFARegisterOffset - 8; | |||
1172 | if (RegOffsets.lookup(ARM::LR) != (-4 - StackAdjust)) { | |||
1173 | DEBUG_WITH_TYPE("compact-unwind",do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "LR not saved as standard frame, StackAdjust=" << StackAdjust << ", CFARegisterOffset=" << CFARegisterOffset << ", lr save at offset=" << RegOffsets [14] << "\n"; } } while (false) | |||
1174 | llvm::dbgs()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "LR not saved as standard frame, StackAdjust=" << StackAdjust << ", CFARegisterOffset=" << CFARegisterOffset << ", lr save at offset=" << RegOffsets [14] << "\n"; } } while (false) | |||
1175 | << "LR not saved as standard frame, StackAdjust="do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "LR not saved as standard frame, StackAdjust=" << StackAdjust << ", CFARegisterOffset=" << CFARegisterOffset << ", lr save at offset=" << RegOffsets [14] << "\n"; } } while (false) | |||
1176 | << StackAdjustdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "LR not saved as standard frame, StackAdjust=" << StackAdjust << ", CFARegisterOffset=" << CFARegisterOffset << ", lr save at offset=" << RegOffsets [14] << "\n"; } } while (false) | |||
1177 | << ", CFARegisterOffset=" << CFARegisterOffsetdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "LR not saved as standard frame, StackAdjust=" << StackAdjust << ", CFARegisterOffset=" << CFARegisterOffset << ", lr save at offset=" << RegOffsets [14] << "\n"; } } while (false) | |||
1178 | << ", lr save at offset=" << RegOffsets[14] << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "LR not saved as standard frame, StackAdjust=" << StackAdjust << ", CFARegisterOffset=" << CFARegisterOffset << ", lr save at offset=" << RegOffsets [14] << "\n"; } } while (false); | |||
1179 | return CU::UNWIND_ARM_MODE_DWARF; | |||
1180 | } | |||
1181 | if (RegOffsets.lookup(ARM::R7) != (-8 - StackAdjust)) { | |||
1182 | DEBUG_WITH_TYPE("compact-unwind",do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "r7 not saved as standard frame\n" ; } } while (false) | |||
1183 | llvm::dbgs() << "r7 not saved as standard frame\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "r7 not saved as standard frame\n" ; } } while (false); | |||
1184 | return CU::UNWIND_ARM_MODE_DWARF; | |||
1185 | } | |||
1186 | uint32_t CompactUnwindEncoding = CU::UNWIND_ARM_MODE_FRAME; | |||
1187 | ||||
1188 | // If var-args are used, there may be a stack adjust required. | |||
1189 | switch (StackAdjust) { | |||
1190 | case 0: | |||
1191 | break; | |||
1192 | case 4: | |||
1193 | CompactUnwindEncoding |= 0x00400000; | |||
1194 | break; | |||
1195 | case 8: | |||
1196 | CompactUnwindEncoding |= 0x00800000; | |||
1197 | break; | |||
1198 | case 12: | |||
1199 | CompactUnwindEncoding |= 0x00C00000; | |||
1200 | break; | |||
1201 | default: | |||
1202 | DEBUG_WITH_TYPE("compact-unwind", llvm::dbgs()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << ".cfi_def_cfa stack adjust (" << StackAdjust << ") out of range\n"; } } while ( false) | |||
1203 | << ".cfi_def_cfa stack adjust ("do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << ".cfi_def_cfa stack adjust (" << StackAdjust << ") out of range\n"; } } while ( false) | |||
1204 | << StackAdjust << ") out of range\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << ".cfi_def_cfa stack adjust (" << StackAdjust << ") out of range\n"; } } while ( false); | |||
1205 | return CU::UNWIND_ARM_MODE_DWARF; | |||
1206 | } | |||
1207 | ||||
1208 | // If r6 is saved, it must be right below r7. | |||
1209 | static struct { | |||
1210 | unsigned Reg; | |||
1211 | unsigned Encoding; | |||
1212 | } GPRCSRegs[] = {{ARM::R6, CU::UNWIND_ARM_FRAME_FIRST_PUSH_R6}, | |||
1213 | {ARM::R5, CU::UNWIND_ARM_FRAME_FIRST_PUSH_R5}, | |||
1214 | {ARM::R4, CU::UNWIND_ARM_FRAME_FIRST_PUSH_R4}, | |||
1215 | {ARM::R12, CU::UNWIND_ARM_FRAME_SECOND_PUSH_R12}, | |||
1216 | {ARM::R11, CU::UNWIND_ARM_FRAME_SECOND_PUSH_R11}, | |||
1217 | {ARM::R10, CU::UNWIND_ARM_FRAME_SECOND_PUSH_R10}, | |||
1218 | {ARM::R9, CU::UNWIND_ARM_FRAME_SECOND_PUSH_R9}, | |||
1219 | {ARM::R8, CU::UNWIND_ARM_FRAME_SECOND_PUSH_R8}}; | |||
1220 | ||||
1221 | int CurOffset = -8 - StackAdjust; | |||
1222 | for (auto CSReg : GPRCSRegs) { | |||
1223 | auto Offset = RegOffsets.find(CSReg.Reg); | |||
1224 | if (Offset == RegOffsets.end()) | |||
1225 | continue; | |||
1226 | ||||
1227 | int RegOffset = Offset->second; | |||
1228 | if (RegOffset != CurOffset - 4) { | |||
1229 | DEBUG_WITH_TYPE("compact-unwind",do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << MRI.getName(CSReg .Reg) << " saved at " << RegOffset << " but only supported at " << CurOffset << "\n"; } } while (false) | |||
1230 | llvm::dbgs() << MRI.getName(CSReg.Reg) << " saved at "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << MRI.getName(CSReg .Reg) << " saved at " << RegOffset << " but only supported at " << CurOffset << "\n"; } } while (false) | |||
1231 | << RegOffset << " but only supported at "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << MRI.getName(CSReg .Reg) << " saved at " << RegOffset << " but only supported at " << CurOffset << "\n"; } } while (false) | |||
1232 | << CurOffset << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << MRI.getName(CSReg .Reg) << " saved at " << RegOffset << " but only supported at " << CurOffset << "\n"; } } while (false); | |||
1233 | return CU::UNWIND_ARM_MODE_DWARF; | |||
1234 | } | |||
1235 | CompactUnwindEncoding |= CSReg.Encoding; | |||
1236 | CurOffset -= 4; | |||
1237 | } | |||
1238 | ||||
1239 | // If no floats saved, we are done. | |||
1240 | if (FloatRegCount == 0) | |||
1241 | return CompactUnwindEncoding; | |||
1242 | ||||
1243 | // Switch mode to include D register saving. | |||
1244 | CompactUnwindEncoding &= ~CU::UNWIND_ARM_MODE_MASK; | |||
1245 | CompactUnwindEncoding |= CU::UNWIND_ARM_MODE_FRAME_D; | |||
1246 | ||||
1247 | // FIXME: supporting more than 4 saved D-registers compactly would be trivial, | |||
1248 | // but needs coordination with the linker and libunwind. | |||
1249 | if (FloatRegCount > 4) { | |||
1250 | DEBUG_WITH_TYPE("compact-unwind",do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "unsupported number of D registers saved (" << FloatRegCount << ")\n"; } } while (false) | |||
1251 | llvm::dbgs() << "unsupported number of D registers saved ("do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "unsupported number of D registers saved (" << FloatRegCount << ")\n"; } } while (false) | |||
1252 | << FloatRegCount << ")\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << "unsupported number of D registers saved (" << FloatRegCount << ")\n"; } } while (false); | |||
1253 | return CU::UNWIND_ARM_MODE_DWARF; | |||
1254 | } | |||
1255 | ||||
1256 | // Floating point registers must either be saved sequentially, or we defer to | |||
1257 | // DWARF. No gaps allowed here so check that each saved d-register is | |||
1258 | // precisely where it should be. | |||
1259 | static unsigned FPRCSRegs[] = { ARM::D8, ARM::D10, ARM::D12, ARM::D14 }; | |||
1260 | for (int Idx = FloatRegCount - 1; Idx >= 0; --Idx) { | |||
1261 | auto Offset = RegOffsets.find(FPRCSRegs[Idx]); | |||
1262 | if (Offset == RegOffsets.end()) { | |||
1263 | DEBUG_WITH_TYPE("compact-unwind",do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << FloatRegCount << " D-regs saved, but " << MRI.getName(FPRCSRegs[Idx]) << " not saved\n"; } } while (false) | |||
1264 | llvm::dbgs() << FloatRegCount << " D-regs saved, but "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << FloatRegCount << " D-regs saved, but " << MRI.getName(FPRCSRegs[Idx]) << " not saved\n"; } } while (false) | |||
1265 | << MRI.getName(FPRCSRegs[Idx])do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << FloatRegCount << " D-regs saved, but " << MRI.getName(FPRCSRegs[Idx]) << " not saved\n"; } } while (false) | |||
1266 | << " not saved\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << FloatRegCount << " D-regs saved, but " << MRI.getName(FPRCSRegs[Idx]) << " not saved\n"; } } while (false); | |||
1267 | return CU::UNWIND_ARM_MODE_DWARF; | |||
1268 | } else if (Offset->second != CurOffset - 8) { | |||
1269 | DEBUG_WITH_TYPE("compact-unwind",do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << FloatRegCount << " D-regs saved, but " << MRI.getName(FPRCSRegs[Idx]) << " saved at " << Offset->second << ", expected at " << CurOffset - 8 << "\n"; } } while (false) | |||
1270 | llvm::dbgs() << FloatRegCount << " D-regs saved, but "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << FloatRegCount << " D-regs saved, but " << MRI.getName(FPRCSRegs[Idx]) << " saved at " << Offset->second << ", expected at " << CurOffset - 8 << "\n"; } } while (false) | |||
1271 | << MRI.getName(FPRCSRegs[Idx])do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << FloatRegCount << " D-regs saved, but " << MRI.getName(FPRCSRegs[Idx]) << " saved at " << Offset->second << ", expected at " << CurOffset - 8 << "\n"; } } while (false) | |||
1272 | << " saved at " << Offset->seconddo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << FloatRegCount << " D-regs saved, but " << MRI.getName(FPRCSRegs[Idx]) << " saved at " << Offset->second << ", expected at " << CurOffset - 8 << "\n"; } } while (false) | |||
1273 | << ", expected at " << CurOffset - 8do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << FloatRegCount << " D-regs saved, but " << MRI.getName(FPRCSRegs[Idx]) << " saved at " << Offset->second << ", expected at " << CurOffset - 8 << "\n"; } } while (false) | |||
1274 | << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("compact-unwind")) { llvm::dbgs() << FloatRegCount << " D-regs saved, but " << MRI.getName(FPRCSRegs[Idx]) << " saved at " << Offset->second << ", expected at " << CurOffset - 8 << "\n"; } } while (false); | |||
1275 | return CU::UNWIND_ARM_MODE_DWARF; | |||
1276 | } | |||
1277 | CurOffset -= 8; | |||
1278 | } | |||
1279 | ||||
1280 | return CompactUnwindEncoding | ((FloatRegCount - 1) << 8); | |||
1281 | } | |||
1282 | ||||
1283 | static MCAsmBackend *createARMAsmBackend(const Target &T, | |||
1284 | const MCSubtargetInfo &STI, | |||
1285 | const MCRegisterInfo &MRI, | |||
1286 | const MCTargetOptions &Options, | |||
1287 | support::endianness Endian) { | |||
1288 | const Triple &TheTriple = STI.getTargetTriple(); | |||
1289 | switch (TheTriple.getObjectFormat()) { | |||
1290 | default: | |||
1291 | llvm_unreachable("unsupported object format")::llvm::llvm_unreachable_internal("unsupported object format" , "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 1291); | |||
1292 | case Triple::MachO: | |||
1293 | return new ARMAsmBackendDarwin(T, STI, MRI); | |||
1294 | case Triple::COFF: | |||
1295 | assert(TheTriple.isOSWindows() && "non-Windows ARM COFF is not supported")((TheTriple.isOSWindows() && "non-Windows ARM COFF is not supported" ) ? static_cast<void> (0) : __assert_fail ("TheTriple.isOSWindows() && \"non-Windows ARM COFF is not supported\"" , "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 1295, __PRETTY_FUNCTION__)); | |||
1296 | return new ARMAsmBackendWinCOFF(T, STI); | |||
1297 | case Triple::ELF: | |||
1298 | assert(TheTriple.isOSBinFormatELF() && "using ELF for non-ELF target")((TheTriple.isOSBinFormatELF() && "using ELF for non-ELF target" ) ? static_cast<void> (0) : __assert_fail ("TheTriple.isOSBinFormatELF() && \"using ELF for non-ELF target\"" , "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp" , 1298, __PRETTY_FUNCTION__)); | |||
1299 | uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TheTriple.getOS()); | |||
1300 | return new ARMAsmBackendELF(T, STI, OSABI, Endian); | |||
1301 | } | |||
1302 | } | |||
1303 | ||||
1304 | MCAsmBackend *llvm::createARMLEAsmBackend(const Target &T, | |||
1305 | const MCSubtargetInfo &STI, | |||
1306 | const MCRegisterInfo &MRI, | |||
1307 | const MCTargetOptions &Options) { | |||
1308 | return createARMAsmBackend(T, STI, MRI, Options, support::little); | |||
1309 | } | |||
1310 | ||||
1311 | MCAsmBackend *llvm::createARMBEAsmBackend(const Target &T, | |||
1312 | const MCSubtargetInfo &STI, | |||
1313 | const MCRegisterInfo &MRI, | |||
1314 | const MCTargetOptions &Options) { | |||
1315 | return createARMAsmBackend(T, STI, MRI, Options, support::big); | |||
1316 | } |