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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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2330 STATIC_ASSERT(StackHandlerConstants::kPCOffset == 4 * kPointerSize); | 2330 STATIC_ASSERT(StackHandlerConstants::kPCOffset == 4 * kPointerSize); |
2331 | 2331 |
2332 // The return address is passed in register ra. | 2332 // The return address is passed in register ra. |
2333 if (try_location == IN_JAVASCRIPT) { | 2333 if (try_location == IN_JAVASCRIPT) { |
2334 if (type == TRY_CATCH_HANDLER) { | 2334 if (type == TRY_CATCH_HANDLER) { |
2335 li(t0, Operand(StackHandler::TRY_CATCH)); | 2335 li(t0, Operand(StackHandler::TRY_CATCH)); |
2336 } else { | 2336 } else { |
2337 li(t0, Operand(StackHandler::TRY_FINALLY)); | 2337 li(t0, Operand(StackHandler::TRY_FINALLY)); |
2338 } | 2338 } |
2339 // Save the current handler as the next handler. | 2339 // Save the current handler as the next handler. |
2340 li(t2, Operand(ExternalReference(Isolate::k_handler_address, isolate()))); | 2340 li(t2, Operand(ExternalReference(Isolate::kHandlerAddress, isolate()))); |
2341 lw(t1, MemOperand(t2)); | 2341 lw(t1, MemOperand(t2)); |
2342 | 2342 |
2343 addiu(sp, sp, -StackHandlerConstants::kSize); | 2343 addiu(sp, sp, -StackHandlerConstants::kSize); |
2344 sw(ra, MemOperand(sp, StackHandlerConstants::kPCOffset)); | 2344 sw(ra, MemOperand(sp, StackHandlerConstants::kPCOffset)); |
2345 sw(fp, MemOperand(sp, StackHandlerConstants::kFPOffset)); | 2345 sw(fp, MemOperand(sp, StackHandlerConstants::kFPOffset)); |
2346 sw(cp, MemOperand(sp, StackHandlerConstants::kContextOffset)); | 2346 sw(cp, MemOperand(sp, StackHandlerConstants::kContextOffset)); |
2347 sw(t0, MemOperand(sp, StackHandlerConstants::kStateOffset)); | 2347 sw(t0, MemOperand(sp, StackHandlerConstants::kStateOffset)); |
2348 sw(t1, MemOperand(sp, StackHandlerConstants::kNextOffset)); | 2348 sw(t1, MemOperand(sp, StackHandlerConstants::kNextOffset)); |
2349 | 2349 |
2350 // Link this handler as the new current one. | 2350 // Link this handler as the new current one. |
2351 sw(sp, MemOperand(t2)); | 2351 sw(sp, MemOperand(t2)); |
2352 | 2352 |
2353 } else { | 2353 } else { |
2354 // Must preserve a0-a3, and s0 (argv). | 2354 // Must preserve a0-a3, and s0 (argv). |
2355 ASSERT(try_location == IN_JS_ENTRY); | 2355 ASSERT(try_location == IN_JS_ENTRY); |
2356 // The frame pointer does not point to a JS frame so we save NULL | 2356 // The frame pointer does not point to a JS frame so we save NULL |
2357 // for fp. We expect the code throwing an exception to check fp | 2357 // for fp. We expect the code throwing an exception to check fp |
2358 // before dereferencing it to restore the context. | 2358 // before dereferencing it to restore the context. |
2359 li(t0, Operand(StackHandler::ENTRY)); | 2359 li(t0, Operand(StackHandler::ENTRY)); |
2360 | 2360 |
2361 // Save the current handler as the next handler. | 2361 // Save the current handler as the next handler. |
2362 li(t2, Operand(ExternalReference(Isolate::k_handler_address, isolate()))); | 2362 li(t2, Operand(ExternalReference(Isolate::kHandlerAddress, isolate()))); |
2363 lw(t1, MemOperand(t2)); | 2363 lw(t1, MemOperand(t2)); |
2364 | 2364 |
2365 ASSERT(Smi::FromInt(0) == 0); // Used for no context. | 2365 ASSERT(Smi::FromInt(0) == 0); // Used for no context. |
2366 | 2366 |
2367 addiu(sp, sp, -StackHandlerConstants::kSize); | 2367 addiu(sp, sp, -StackHandlerConstants::kSize); |
2368 sw(ra, MemOperand(sp, StackHandlerConstants::kPCOffset)); | 2368 sw(ra, MemOperand(sp, StackHandlerConstants::kPCOffset)); |
2369 sw(zero_reg, MemOperand(sp, StackHandlerConstants::kFPOffset)); | 2369 sw(zero_reg, MemOperand(sp, StackHandlerConstants::kFPOffset)); |
2370 sw(zero_reg, MemOperand(sp, StackHandlerConstants::kContextOffset)); | 2370 sw(zero_reg, MemOperand(sp, StackHandlerConstants::kContextOffset)); |
2371 sw(t0, MemOperand(sp, StackHandlerConstants::kStateOffset)); | 2371 sw(t0, MemOperand(sp, StackHandlerConstants::kStateOffset)); |
2372 sw(t1, MemOperand(sp, StackHandlerConstants::kNextOffset)); | 2372 sw(t1, MemOperand(sp, StackHandlerConstants::kNextOffset)); |
2373 | 2373 |
2374 // Link this handler as the new current one. | 2374 // Link this handler as the new current one. |
2375 sw(sp, MemOperand(t2)); | 2375 sw(sp, MemOperand(t2)); |
2376 } | 2376 } |
2377 } | 2377 } |
2378 | 2378 |
2379 | 2379 |
2380 void MacroAssembler::PopTryHandler() { | 2380 void MacroAssembler::PopTryHandler() { |
2381 STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); | 2381 STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); |
2382 pop(a1); | 2382 pop(a1); |
2383 Addu(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize)); | 2383 Addu(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize)); |
2384 li(at, Operand(ExternalReference(Isolate::k_handler_address, isolate()))); | 2384 li(at, Operand(ExternalReference(Isolate::kHandlerAddress, isolate()))); |
2385 sw(a1, MemOperand(at)); | 2385 sw(a1, MemOperand(at)); |
2386 } | 2386 } |
2387 | 2387 |
2388 | 2388 |
2389 void MacroAssembler::Throw(Register value) { | 2389 void MacroAssembler::Throw(Register value) { |
2390 // v0 is expected to hold the exception. | 2390 // v0 is expected to hold the exception. |
2391 Move(v0, value); | 2391 Move(v0, value); |
2392 | 2392 |
2393 // Adjust this code if not the case. | 2393 // Adjust this code if not the case. |
2394 STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize); | 2394 STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize); |
2395 STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize); | 2395 STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize); |
2396 STATIC_ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize); | 2396 STATIC_ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize); |
2397 STATIC_ASSERT(StackHandlerConstants::kContextOffset == 2 * kPointerSize); | 2397 STATIC_ASSERT(StackHandlerConstants::kContextOffset == 2 * kPointerSize); |
2398 STATIC_ASSERT(StackHandlerConstants::kFPOffset == 3 * kPointerSize); | 2398 STATIC_ASSERT(StackHandlerConstants::kFPOffset == 3 * kPointerSize); |
2399 STATIC_ASSERT(StackHandlerConstants::kPCOffset == 4 * kPointerSize); | 2399 STATIC_ASSERT(StackHandlerConstants::kPCOffset == 4 * kPointerSize); |
2400 | 2400 |
2401 // Drop the sp to the top of the handler. | 2401 // Drop the sp to the top of the handler. |
2402 li(a3, Operand(ExternalReference(Isolate::k_handler_address, | 2402 li(a3, Operand(ExternalReference(Isolate::kHandlerAddress, |
2403 isolate()))); | 2403 isolate()))); |
2404 lw(sp, MemOperand(a3)); | 2404 lw(sp, MemOperand(a3)); |
2405 | 2405 |
2406 // Restore the next handler. | 2406 // Restore the next handler. |
2407 pop(a2); | 2407 pop(a2); |
2408 sw(a2, MemOperand(a3)); | 2408 sw(a2, MemOperand(a3)); |
2409 | 2409 |
2410 // Restore context and frame pointer, discard state (a3). | 2410 // Restore context and frame pointer, discard state (a3). |
2411 MultiPop(a3.bit() | cp.bit() | fp.bit()); | 2411 MultiPop(a3.bit() | cp.bit() | fp.bit()); |
2412 | 2412 |
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2455 STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize); | 2455 STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize); |
2456 STATIC_ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize); | 2456 STATIC_ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize); |
2457 STATIC_ASSERT(StackHandlerConstants::kContextOffset == 2 * kPointerSize); | 2457 STATIC_ASSERT(StackHandlerConstants::kContextOffset == 2 * kPointerSize); |
2458 STATIC_ASSERT(StackHandlerConstants::kFPOffset == 3 * kPointerSize); | 2458 STATIC_ASSERT(StackHandlerConstants::kFPOffset == 3 * kPointerSize); |
2459 STATIC_ASSERT(StackHandlerConstants::kPCOffset == 4 * kPointerSize); | 2459 STATIC_ASSERT(StackHandlerConstants::kPCOffset == 4 * kPointerSize); |
2460 | 2460 |
2461 // v0 is expected to hold the exception. | 2461 // v0 is expected to hold the exception. |
2462 Move(v0, value); | 2462 Move(v0, value); |
2463 | 2463 |
2464 // Drop sp to the top stack handler. | 2464 // Drop sp to the top stack handler. |
2465 li(a3, Operand(ExternalReference(Isolate::k_handler_address, isolate()))); | 2465 li(a3, Operand(ExternalReference(Isolate::kHandlerAddress, isolate()))); |
2466 lw(sp, MemOperand(a3)); | 2466 lw(sp, MemOperand(a3)); |
2467 | 2467 |
2468 // Unwind the handlers until the ENTRY handler is found. | 2468 // Unwind the handlers until the ENTRY handler is found. |
2469 Label loop, done; | 2469 Label loop, done; |
2470 bind(&loop); | 2470 bind(&loop); |
2471 // Load the type of the current stack handler. | 2471 // Load the type of the current stack handler. |
2472 const int kStateOffset = StackHandlerConstants::kStateOffset; | 2472 const int kStateOffset = StackHandlerConstants::kStateOffset; |
2473 lw(a2, MemOperand(sp, kStateOffset)); | 2473 lw(a2, MemOperand(sp, kStateOffset)); |
2474 Branch(&done, eq, a2, Operand(StackHandler::ENTRY)); | 2474 Branch(&done, eq, a2, Operand(StackHandler::ENTRY)); |
2475 // Fetch the next handler in the list. | 2475 // Fetch the next handler in the list. |
2476 const int kNextOffset = StackHandlerConstants::kNextOffset; | 2476 const int kNextOffset = StackHandlerConstants::kNextOffset; |
2477 lw(sp, MemOperand(sp, kNextOffset)); | 2477 lw(sp, MemOperand(sp, kNextOffset)); |
2478 jmp(&loop); | 2478 jmp(&loop); |
2479 bind(&done); | 2479 bind(&done); |
2480 | 2480 |
2481 // Set the top handler address to next handler past the current ENTRY handler. | 2481 // Set the top handler address to next handler past the current ENTRY handler. |
2482 pop(a2); | 2482 pop(a2); |
2483 sw(a2, MemOperand(a3)); | 2483 sw(a2, MemOperand(a3)); |
2484 | 2484 |
2485 if (type == OUT_OF_MEMORY) { | 2485 if (type == OUT_OF_MEMORY) { |
2486 // Set external caught exception to false. | 2486 // Set external caught exception to false. |
2487 ExternalReference external_caught( | 2487 ExternalReference external_caught( |
2488 Isolate::k_external_caught_exception_address, isolate()); | 2488 Isolate::kExternalCaughtExceptionAddress, isolate()); |
2489 li(a0, Operand(false, RelocInfo::NONE)); | 2489 li(a0, Operand(false, RelocInfo::NONE)); |
2490 li(a2, Operand(external_caught)); | 2490 li(a2, Operand(external_caught)); |
2491 sw(a0, MemOperand(a2)); | 2491 sw(a0, MemOperand(a2)); |
2492 | 2492 |
2493 // Set pending exception and v0 to out of memory exception. | 2493 // Set pending exception and v0 to out of memory exception. |
2494 Failure* out_of_memory = Failure::OutOfMemoryException(); | 2494 Failure* out_of_memory = Failure::OutOfMemoryException(); |
2495 li(v0, Operand(reinterpret_cast<int32_t>(out_of_memory))); | 2495 li(v0, Operand(reinterpret_cast<int32_t>(out_of_memory))); |
2496 li(a2, Operand(ExternalReference(Isolate::k_pending_exception_address, | 2496 li(a2, Operand(ExternalReference(Isolate::kPendingExceptionAddress, |
2497 isolate()))); | 2497 isolate()))); |
2498 sw(v0, MemOperand(a2)); | 2498 sw(v0, MemOperand(a2)); |
2499 } | 2499 } |
2500 | 2500 |
2501 // Stack layout at this point. See also StackHandlerConstants. | 2501 // Stack layout at this point. See also StackHandlerConstants. |
2502 // sp -> state (ENTRY) | 2502 // sp -> state (ENTRY) |
2503 // cp | 2503 // cp |
2504 // fp | 2504 // fp |
2505 // ra | 2505 // ra |
2506 | 2506 |
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3966 addiu(fp, sp, 2 * kPointerSize); // Setup new frame pointer. | 3966 addiu(fp, sp, 2 * kPointerSize); // Setup new frame pointer. |
3967 | 3967 |
3968 if (emit_debug_code()) { | 3968 if (emit_debug_code()) { |
3969 sw(zero_reg, MemOperand(fp, ExitFrameConstants::kSPOffset)); | 3969 sw(zero_reg, MemOperand(fp, ExitFrameConstants::kSPOffset)); |
3970 } | 3970 } |
3971 | 3971 |
3972 li(t8, Operand(CodeObject())); // Accessed from ExitFrame::code_slot. | 3972 li(t8, Operand(CodeObject())); // Accessed from ExitFrame::code_slot. |
3973 sw(t8, MemOperand(fp, ExitFrameConstants::kCodeOffset)); | 3973 sw(t8, MemOperand(fp, ExitFrameConstants::kCodeOffset)); |
3974 | 3974 |
3975 // Save the frame pointer and the context in top. | 3975 // Save the frame pointer and the context in top. |
3976 li(t8, Operand(ExternalReference(Isolate::k_c_entry_fp_address, isolate()))); | 3976 li(t8, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate()))); |
3977 sw(fp, MemOperand(t8)); | 3977 sw(fp, MemOperand(t8)); |
3978 li(t8, Operand(ExternalReference(Isolate::k_context_address, isolate()))); | 3978 li(t8, Operand(ExternalReference(Isolate::kContextAddress, isolate()))); |
3979 sw(cp, MemOperand(t8)); | 3979 sw(cp, MemOperand(t8)); |
3980 | 3980 |
3981 const int frame_alignment = MacroAssembler::ActivationFrameAlignment(); | 3981 const int frame_alignment = MacroAssembler::ActivationFrameAlignment(); |
3982 if (save_doubles) { | 3982 if (save_doubles) { |
3983 // The stack must be allign to 0 modulo 8 for stores with sdc1. | 3983 // The stack must be allign to 0 modulo 8 for stores with sdc1. |
3984 ASSERT(kDoubleSize == frame_alignment); | 3984 ASSERT(kDoubleSize == frame_alignment); |
3985 if (frame_alignment > 0) { | 3985 if (frame_alignment > 0) { |
3986 ASSERT(IsPowerOf2(frame_alignment)); | 3986 ASSERT(IsPowerOf2(frame_alignment)); |
3987 And(sp, sp, Operand(-frame_alignment)); // Align stack. | 3987 And(sp, sp, Operand(-frame_alignment)); // Align stack. |
3988 } | 3988 } |
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4018 if (save_doubles) { | 4018 if (save_doubles) { |
4019 // Remember: we only need to restore every 2nd double FPU value. | 4019 // Remember: we only need to restore every 2nd double FPU value. |
4020 lw(t8, MemOperand(fp, ExitFrameConstants::kSPOffset)); | 4020 lw(t8, MemOperand(fp, ExitFrameConstants::kSPOffset)); |
4021 for (int i = 0; i < FPURegister::kNumRegisters; i+=2) { | 4021 for (int i = 0; i < FPURegister::kNumRegisters; i+=2) { |
4022 FPURegister reg = FPURegister::from_code(i); | 4022 FPURegister reg = FPURegister::from_code(i); |
4023 ldc1(reg, MemOperand(t8, i * kDoubleSize + kPointerSize)); | 4023 ldc1(reg, MemOperand(t8, i * kDoubleSize + kPointerSize)); |
4024 } | 4024 } |
4025 } | 4025 } |
4026 | 4026 |
4027 // Clear top frame. | 4027 // Clear top frame. |
4028 li(t8, Operand(ExternalReference(Isolate::k_c_entry_fp_address, isolate()))); | 4028 li(t8, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate()))); |
4029 sw(zero_reg, MemOperand(t8)); | 4029 sw(zero_reg, MemOperand(t8)); |
4030 | 4030 |
4031 // Restore current context from top and clear it in debug mode. | 4031 // Restore current context from top and clear it in debug mode. |
4032 li(t8, Operand(ExternalReference(Isolate::k_context_address, isolate()))); | 4032 li(t8, Operand(ExternalReference(Isolate::kContextAddress, isolate()))); |
4033 lw(cp, MemOperand(t8)); | 4033 lw(cp, MemOperand(t8)); |
4034 #ifdef DEBUG | 4034 #ifdef DEBUG |
4035 sw(a3, MemOperand(t8)); | 4035 sw(a3, MemOperand(t8)); |
4036 #endif | 4036 #endif |
4037 | 4037 |
4038 // Pop the arguments, restore registers, and return. | 4038 // Pop the arguments, restore registers, and return. |
4039 mov(sp, fp); // Respect ABI stack constraint. | 4039 mov(sp, fp); // Respect ABI stack constraint. |
4040 lw(fp, MemOperand(sp, ExitFrameConstants::kCallerFPOffset)); | 4040 lw(fp, MemOperand(sp, ExitFrameConstants::kCallerFPOffset)); |
4041 lw(ra, MemOperand(sp, ExitFrameConstants::kCallerPCOffset)); | 4041 lw(ra, MemOperand(sp, ExitFrameConstants::kCallerPCOffset)); |
4042 addiu(sp, sp, 8); | 4042 addiu(sp, sp, 8); |
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4403 opcode == BGTZL); | 4403 opcode == BGTZL); |
4404 opcode = (cond == eq) ? BEQ : BNE; | 4404 opcode = (cond == eq) ? BEQ : BNE; |
4405 instr = (instr & ~kOpcodeMask) | opcode; | 4405 instr = (instr & ~kOpcodeMask) | opcode; |
4406 masm_.emit(instr); | 4406 masm_.emit(instr); |
4407 } | 4407 } |
4408 | 4408 |
4409 | 4409 |
4410 } } // namespace v8::internal | 4410 } } // namespace v8::internal |
4411 | 4411 |
4412 #endif // V8_TARGET_ARCH_MIPS | 4412 #endif // V8_TARGET_ARCH_MIPS |
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