Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/v8.h" |
| 6 | |
| 7 | #if V8_TARGET_ARCH_PPC |
| 8 | |
| 9 | #include "src/codegen.h" |
| 10 | #include "src/debug.h" |
| 11 | |
| 12 | namespace v8 { |
| 13 | namespace internal { |
| 14 | |
| 15 | bool BreakLocationIterator::IsDebugBreakAtReturn() { |
| 16 | return Debug::IsDebugBreakAtReturn(rinfo()); |
| 17 | } |
| 18 | |
| 19 | |
| 20 | void BreakLocationIterator::SetDebugBreakAtReturn() { |
| 21 | // Patch the code changing the return from JS function sequence from |
| 22 | // |
| 23 | // LeaveFrame |
| 24 | // blr |
| 25 | // |
| 26 | // to a call to the debug break return code. |
| 27 | // this uses a FIXED_SEQUENCE to load an address constant |
| 28 | // |
| 29 | // mov r0, <address> |
| 30 | // mtlr r0 |
| 31 | // blrl |
| 32 | // bkpt |
| 33 | // |
| 34 | CodePatcher patcher(rinfo()->pc(), Assembler::kJSReturnSequenceInstructions); |
| 35 | Assembler::BlockTrampolinePoolScope block_trampoline_pool(patcher.masm()); |
| 36 | patcher.masm()->mov( |
| 37 | v8::internal::r0, |
| 38 | Operand(reinterpret_cast<intptr_t>(debug_info_->GetIsolate() |
| 39 | ->builtins() |
| 40 | ->Return_DebugBreak() |
| 41 | ->entry()))); |
| 42 | patcher.masm()->mtctr(v8::internal::r0); |
| 43 | patcher.masm()->bctrl(); |
| 44 | patcher.masm()->bkpt(0); |
| 45 | } |
| 46 | |
| 47 | |
| 48 | // Restore the JS frame exit code. |
| 49 | void BreakLocationIterator::ClearDebugBreakAtReturn() { |
| 50 | rinfo()->PatchCode(original_rinfo()->pc(), |
| 51 | Assembler::kJSReturnSequenceInstructions); |
| 52 | } |
| 53 | |
| 54 | |
| 55 | // A debug break in the frame exit code is identified by the JS frame exit code |
| 56 | // having been patched with a call instruction. |
| 57 | bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) { |
| 58 | DCHECK(RelocInfo::IsJSReturn(rinfo->rmode())); |
| 59 | return rinfo->IsPatchedReturnSequence(); |
| 60 | } |
| 61 | |
| 62 | |
| 63 | bool BreakLocationIterator::IsDebugBreakAtSlot() { |
| 64 | DCHECK(IsDebugBreakSlot()); |
| 65 | // Check whether the debug break slot instructions have been patched. |
| 66 | return rinfo()->IsPatchedDebugBreakSlotSequence(); |
| 67 | } |
| 68 | |
| 69 | |
| 70 | void BreakLocationIterator::SetDebugBreakAtSlot() { |
| 71 | DCHECK(IsDebugBreakSlot()); |
| 72 | // Patch the code changing the debug break slot code from |
| 73 | // |
| 74 | // ori r3, r3, 0 |
| 75 | // ori r3, r3, 0 |
| 76 | // ori r3, r3, 0 |
| 77 | // ori r3, r3, 0 |
| 78 | // ori r3, r3, 0 |
| 79 | // |
| 80 | // to a call to the debug break code, using a FIXED_SEQUENCE. |
| 81 | // |
| 82 | // mov r0, <address> |
| 83 | // mtlr r0 |
| 84 | // blrl |
| 85 | // |
| 86 | CodePatcher patcher(rinfo()->pc(), Assembler::kDebugBreakSlotInstructions); |
| 87 | Assembler::BlockTrampolinePoolScope block_trampoline_pool(patcher.masm()); |
| 88 | patcher.masm()->mov( |
| 89 | v8::internal::r0, |
| 90 | Operand(reinterpret_cast<intptr_t>( |
| 91 | debug_info_->GetIsolate()->builtins()->Slot_DebugBreak()->entry()))); |
| 92 | patcher.masm()->mtctr(v8::internal::r0); |
| 93 | patcher.masm()->bctrl(); |
| 94 | } |
| 95 | |
| 96 | |
| 97 | void BreakLocationIterator::ClearDebugBreakAtSlot() { |
| 98 | DCHECK(IsDebugBreakSlot()); |
| 99 | rinfo()->PatchCode(original_rinfo()->pc(), |
| 100 | Assembler::kDebugBreakSlotInstructions); |
| 101 | } |
| 102 | |
| 103 | |
| 104 | #define __ ACCESS_MASM(masm) |
| 105 | |
| 106 | |
| 107 | static void Generate_DebugBreakCallHelper(MacroAssembler* masm, |
| 108 | RegList object_regs, |
| 109 | RegList non_object_regs) { |
| 110 | { |
| 111 | FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL); |
| 112 | |
| 113 | // Load padding words on stack. |
| 114 | __ LoadSmiLiteral(ip, Smi::FromInt(LiveEdit::kFramePaddingValue)); |
| 115 | for (int i = 0; i < LiveEdit::kFramePaddingInitialSize; i++) { |
| 116 | __ push(ip); |
| 117 | } |
| 118 | __ LoadSmiLiteral(ip, Smi::FromInt(LiveEdit::kFramePaddingInitialSize)); |
| 119 | __ push(ip); |
| 120 | |
| 121 | // Store the registers containing live values on the expression stack to |
| 122 | // make sure that these are correctly updated during GC. Non object values |
| 123 | // are stored as a smi causing it to be untouched by GC. |
| 124 | DCHECK((object_regs & ~kJSCallerSaved) == 0); |
| 125 | DCHECK((non_object_regs & ~kJSCallerSaved) == 0); |
| 126 | DCHECK((object_regs & non_object_regs) == 0); |
| 127 | if ((object_regs | non_object_regs) != 0) { |
| 128 | for (int i = 0; i < kNumJSCallerSaved; i++) { |
| 129 | int r = JSCallerSavedCode(i); |
| 130 | Register reg = {r}; |
| 131 | if ((non_object_regs & (1 << r)) != 0) { |
| 132 | if (FLAG_debug_code) { |
| 133 | __ TestUnsignedSmiCandidate(reg, r0); |
| 134 | __ Assert(eq, kUnableToEncodeValueAsSmi, cr0); |
| 135 | } |
| 136 | __ SmiTag(reg); |
| 137 | } |
| 138 | } |
| 139 | __ MultiPush(object_regs | non_object_regs); |
| 140 | } |
| 141 | |
| 142 | #ifdef DEBUG |
| 143 | __ RecordComment("// Calling from debug break to runtime - come in - over"); |
| 144 | #endif |
| 145 | __ mov(r3, Operand::Zero()); // no arguments |
| 146 | __ mov(r4, Operand(ExternalReference::debug_break(masm->isolate()))); |
| 147 | |
| 148 | CEntryStub ceb(masm->isolate(), 1); |
| 149 | __ CallStub(&ceb); |
| 150 | |
| 151 | // Restore the register values from the expression stack. |
| 152 | if ((object_regs | non_object_regs) != 0) { |
| 153 | __ MultiPop(object_regs | non_object_regs); |
| 154 | for (int i = 0; i < kNumJSCallerSaved; i++) { |
| 155 | int r = JSCallerSavedCode(i); |
| 156 | Register reg = {r}; |
| 157 | if ((non_object_regs & (1 << r)) != 0) { |
| 158 | __ SmiUntag(reg); |
| 159 | } |
| 160 | if (FLAG_debug_code && |
| 161 | (((object_regs | non_object_regs) & (1 << r)) == 0)) { |
| 162 | __ mov(reg, Operand(kDebugZapValue)); |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | // Don't bother removing padding bytes pushed on the stack |
| 168 | // as the frame is going to be restored right away. |
| 169 | |
| 170 | // Leave the internal frame. |
| 171 | } |
| 172 | |
| 173 | // Now that the break point has been handled, resume normal execution by |
| 174 | // jumping to the target address intended by the caller and that was |
| 175 | // overwritten by the address of DebugBreakXXX. |
| 176 | ExternalReference after_break_target = |
| 177 | ExternalReference::debug_after_break_target_address(masm->isolate()); |
| 178 | __ mov(ip, Operand(after_break_target)); |
| 179 | __ LoadP(ip, MemOperand(ip)); |
| 180 | __ JumpToJSEntry(ip); |
| 181 | } |
| 182 | |
| 183 | |
| 184 | void DebugCodegen::GenerateCallICStubDebugBreak(MacroAssembler* masm) { |
| 185 | // Register state for CallICStub |
| 186 | // ----------- S t a t e ------------- |
| 187 | // -- r4 : function |
| 188 | // -- r6 : slot in feedback array (smi) |
| 189 | // ----------------------------------- |
| 190 | Generate_DebugBreakCallHelper(masm, r4.bit() | r6.bit(), 0); |
| 191 | } |
| 192 | |
| 193 | |
| 194 | void DebugCodegen::GenerateLoadICDebugBreak(MacroAssembler* masm) { |
| 195 | // Calling convention for IC load (from ic-ppc.cc). |
| 196 | Register receiver = LoadDescriptor::ReceiverRegister(); |
| 197 | Register name = LoadDescriptor::NameRegister(); |
| 198 | RegList regs = receiver.bit() | name.bit(); |
| 199 | if (FLAG_vector_ics) { |
| 200 | regs |= VectorLoadICTrampolineDescriptor::SlotRegister().bit(); |
| 201 | } |
| 202 | Generate_DebugBreakCallHelper(masm, regs, 0); |
| 203 | } |
| 204 | |
| 205 | |
| 206 | void DebugCodegen::GenerateStoreICDebugBreak(MacroAssembler* masm) { |
| 207 | // Calling convention for IC store (from ic-ppc.cc). |
| 208 | Register receiver = StoreDescriptor::ReceiverRegister(); |
| 209 | Register name = StoreDescriptor::NameRegister(); |
| 210 | Register value = StoreDescriptor::ValueRegister(); |
| 211 | Generate_DebugBreakCallHelper(masm, receiver.bit() | name.bit() | value.bit(), |
| 212 | 0); |
| 213 | } |
| 214 | |
| 215 | |
| 216 | void DebugCodegen::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) { |
| 217 | // Calling convention for keyed IC load (from ic-ppc.cc). |
| 218 | GenerateLoadICDebugBreak(masm); |
| 219 | } |
| 220 | |
| 221 | |
| 222 | void DebugCodegen::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) { |
| 223 | // Calling convention for IC keyed store call (from ic-ppc.cc). |
| 224 | Register receiver = StoreDescriptor::ReceiverRegister(); |
| 225 | Register name = StoreDescriptor::NameRegister(); |
| 226 | Register value = StoreDescriptor::ValueRegister(); |
| 227 | Generate_DebugBreakCallHelper(masm, receiver.bit() | name.bit() | value.bit(), |
| 228 | 0); |
| 229 | } |
| 230 | |
| 231 | |
| 232 | void DebugCodegen::GenerateCompareNilICDebugBreak(MacroAssembler* masm) { |
| 233 | // Register state for CompareNil IC |
| 234 | // ----------- S t a t e ------------- |
| 235 | // -- r3 : value |
| 236 | // ----------------------------------- |
| 237 | Generate_DebugBreakCallHelper(masm, r3.bit(), 0); |
| 238 | } |
| 239 | |
| 240 | |
| 241 | void DebugCodegen::GenerateReturnDebugBreak(MacroAssembler* masm) { |
| 242 | // In places other than IC call sites it is expected that r3 is TOS which |
| 243 | // is an object - this is not generally the case so this should be used with |
| 244 | // care. |
| 245 | Generate_DebugBreakCallHelper(masm, r3.bit(), 0); |
| 246 | } |
| 247 | |
| 248 | |
| 249 | void DebugCodegen::GenerateCallFunctionStubDebugBreak(MacroAssembler* masm) { |
| 250 | // Register state for CallFunctionStub (from code-stubs-ppc.cc). |
| 251 | // ----------- S t a t e ------------- |
| 252 | // -- r4 : function |
| 253 | // ----------------------------------- |
| 254 | Generate_DebugBreakCallHelper(masm, r4.bit(), 0); |
| 255 | } |
| 256 | |
| 257 | |
| 258 | void DebugCodegen::GenerateCallConstructStubDebugBreak(MacroAssembler* masm) { |
| 259 | // Calling convention for CallConstructStub (from code-stubs-ppc.cc) |
| 260 | // ----------- S t a t e ------------- |
| 261 | // -- r3 : number of arguments (not smi) |
| 262 | // -- r4 : constructor function |
| 263 | // ----------------------------------- |
| 264 | Generate_DebugBreakCallHelper(masm, r4.bit(), r3.bit()); |
| 265 | } |
| 266 | |
| 267 | |
| 268 | void DebugCodegen::GenerateCallConstructStubRecordDebugBreak( |
| 269 | MacroAssembler* masm) { |
| 270 | // Calling convention for CallConstructStub (from code-stubs-ppc.cc) |
| 271 | // ----------- S t a t e ------------- |
| 272 | // -- r3 : number of arguments (not smi) |
| 273 | // -- r4 : constructor function |
| 274 | // -- r5 : feedback array |
| 275 | // -- r6 : feedback slot (smi) |
| 276 | // ----------------------------------- |
| 277 | Generate_DebugBreakCallHelper(masm, r4.bit() | r5.bit() | r6.bit(), r3.bit()); |
| 278 | } |
| 279 | |
| 280 | |
| 281 | void DebugCodegen::GenerateSlot(MacroAssembler* masm) { |
| 282 | // Generate enough nop's to make space for a call instruction. Avoid emitting |
| 283 | // the trampoline pool in the debug break slot code. |
| 284 | Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm); |
| 285 | Label check_codesize; |
| 286 | __ bind(&check_codesize); |
| 287 | __ RecordDebugBreakSlot(); |
| 288 | for (int i = 0; i < Assembler::kDebugBreakSlotInstructions; i++) { |
| 289 | __ nop(MacroAssembler::DEBUG_BREAK_NOP); |
| 290 | } |
| 291 | DCHECK_EQ(Assembler::kDebugBreakSlotInstructions, |
| 292 | masm->InstructionsGeneratedSince(&check_codesize)); |
| 293 | } |
| 294 | |
| 295 | |
| 296 | void DebugCodegen::GenerateSlotDebugBreak(MacroAssembler* masm) { |
| 297 | // In the places where a debug break slot is inserted no registers can contain |
| 298 | // object pointers. |
| 299 | Generate_DebugBreakCallHelper(masm, 0, 0); |
| 300 | } |
| 301 | |
| 302 | |
| 303 | void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) { |
| 304 | __ Ret(); |
| 305 | } |
| 306 | |
| 307 | |
| 308 | void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) { |
| 309 | ExternalReference restarter_frame_function_slot = |
| 310 | ExternalReference::debug_restarter_frame_function_pointer_address( |
| 311 | masm->isolate()); |
| 312 | __ mov(ip, Operand(restarter_frame_function_slot)); |
| 313 | __ li(r4, Operand::Zero()); |
| 314 | __ StoreP(r4, MemOperand(ip, 0)); |
| 315 | |
| 316 | // Load the function pointer off of our current stack frame. |
| 317 | __ LoadP(r4, MemOperand(fp, StandardFrameConstants::kConstantPoolOffset - |
| 318 | kPointerSize)); |
| 319 | |
| 320 | // Pop return address, frame and constant pool pointer (if |
| 321 | // FLAG_enable_ool_constant_pool). |
| 322 | __ LeaveFrame(StackFrame::INTERNAL); |
| 323 | |
| 324 | // Load context from the function. |
| 325 | __ LoadP(cp, FieldMemOperand(r4, JSFunction::kContextOffset)); |
| 326 | |
| 327 | // Get function code. |
| 328 | __ LoadP(ip, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset)); |
| 329 | __ LoadP(ip, FieldMemOperand(ip, SharedFunctionInfo::kCodeOffset)); |
| 330 | __ addi(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag)); |
| 331 | |
| 332 | // Re-run JSFunction, r4 is function, cp is context. |
| 333 | __ Jump(ip); |
| 334 | } |
| 335 | |
| 336 | |
| 337 | const bool LiveEdit::kFrameDropperSupported = true; |
| 338 | |
| 339 | #undef __ |
| 340 | } |
| 341 | } // namespace v8::internal |
| 342 | |
| 343 | #endif // V8_TARGET_ARCH_PPC |