1 /*
2 * Copyright (c) 1998, 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2015 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #ifdef COMPILER2
28 #include "asm/assembler.inline.hpp"
29 #include "asm/macroAssembler.inline.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "code/vmreg.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/interp_masm.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "nativeInst_ppc.hpp"
36 #include "opto/runtime.hpp"
37 #include "runtime/interfaceSupport.hpp"
38 #include "runtime/sharedRuntime.hpp"
39 #include "runtime/stubRoutines.hpp"
40 #include "runtime/vframeArray.hpp"
41 #include "utilities/globalDefinitions.hpp"
42 #endif
43
44 #define __ masm->
45
46
47 #ifdef COMPILER2
48
49 //------------------------------generate_exception_blob---------------------------
50 // Creates exception blob at the end.
51 // Using exception blob, this code is jumped from a compiled method.
52 //
53 // Given an exception pc at a call we call into the runtime for the
54 // handler in this method. This handler might merely restore state
55 // (i.e. callee save registers) unwind the frame and jump to the
56 // exception handler for the nmethod if there is no Java level handler
57 // for the nmethod.
58 //
59 // This code is entered with a jmp.
60 //
61 // Arguments:
62 // R3_ARG1: exception oop
63 // R4_ARG2: exception pc
64 //
65 // Results:
66 // R3_ARG1: exception oop
67 // R4_ARG2: exception pc in caller
68 // destination: exception handler of caller
69 //
70 // Note: the exception pc MUST be at a call (precise debug information)
71 //
72 void OptoRuntime::generate_exception_blob() {
73 // Allocate space for the code.
74 ResourceMark rm;
75 // Setup code generation tools.
76 CodeBuffer buffer("exception_blob", 2048, 1024);
77 InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer);
78
79 address start = __ pc();
80
81 int frame_size_in_bytes = frame::abi_reg_args_size;
82 OopMap* map = new OopMap(frame_size_in_bytes / sizeof(jint), 0);
83
84 // Exception pc is 'return address' for stack walker.
85 __ std(R4_ARG2/*exception pc*/, _abi(lr), R1_SP);
86
87 // Store the exception in the Thread object.
88 __ std(R3_ARG1/*exception oop*/, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
89 __ std(R4_ARG2/*exception pc*/, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
90
91 // Save callee-saved registers.
92 // Push a C frame for the exception blob. It is needed for the C call later on.
93 __ push_frame_reg_args(0, R11_scratch1);
94
95 // This call does all the hard work. It checks if an exception handler
96 // exists in the method.
97 // If so, it returns the handler address.
98 // If not, it prepares for stack-unwinding, restoring the callee-save
99 // registers of the frame being removed.
100 __ set_last_Java_frame(/*sp=*/R1_SP, noreg);
101
102 __ mr(R3_ARG1, R16_thread);
103 #if defined(ABI_ELFv2)
104 __ call_c((address) OptoRuntime::handle_exception_C, relocInfo::none);
105 #else
106 __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, OptoRuntime::handle_exception_C),
107 relocInfo::none);
108 #endif
109 address calls_return_pc = __ last_calls_return_pc();
110 # ifdef ASSERT
111 __ cmpdi(CCR0, R3_RET, 0);
112 __ asm_assert_ne("handle_exception_C must not return NULL", 0x601);
113 # endif
114
115 // Set an oopmap for the call site. This oopmap will only be used if we
116 // are unwinding the stack. Hence, all locations will be dead.
117 // Callee-saved registers will be the same as the frame above (i.e.,
118 // handle_exception_stub), since they were restored when we got the
119 // exception.
120 OopMapSet* oop_maps = new OopMapSet();
121 oop_maps->add_gc_map(calls_return_pc - start, map);
122
123 __ mtctr(R3_RET); // Move address of exception handler to SR_CTR.
124 __ reset_last_Java_frame();
125 __ pop_frame();
126
127 // We have a handler in register SR_CTR (could be deopt blob).
128
129 // Get the exception oop.
130 __ ld(R3_ARG1, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
131
132 // Get the exception pc in case we are deoptimized.
133 __ ld(R4_ARG2, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
134
135 // Reset thread values.
136 __ li(R0, 0);
137 #ifdef ASSERT
138 __ std(R0, in_bytes(JavaThread::exception_handler_pc_offset()), R16_thread);
139 __ std(R0, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
140 #endif
141 // Clear the exception oop so GC no longer processes it as a root.
142 __ std(R0, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
143
144 // Move exception pc into SR_LR.
145 __ mtlr(R4_ARG2);
146 __ bctr();
147
148 // Make sure all code is generated.
149 masm->flush();
150
151 // Set exception blob.
152 _exception_blob = ExceptionBlob::create(&buffer, oop_maps,
153 frame_size_in_bytes/wordSize);
154 }
155
156 #endif // COMPILER2