1 /* 2 * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2007, 2008, 2010, 2015 Red Hat, Inc. 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 #include "asm/assembler.hpp" 28 #include "assembler_zero.inline.hpp" 29 #include "interpreter/interpreter.hpp" 30 #include "nativeInst_zero.hpp" 31 #include "oops/instanceOop.hpp" 32 #include "oops/method.hpp" 33 #include "oops/objArrayKlass.hpp" 34 #include "oops/oop.inline.hpp" 35 #include "prims/methodHandles.hpp" 36 #include "runtime/frame.inline.hpp" 37 #include "runtime/handles.inline.hpp" 38 #include "runtime/sharedRuntime.hpp" 39 #include "runtime/stubCodeGenerator.hpp" 40 #include "runtime/stubRoutines.hpp" 41 #include "runtime/thread.inline.hpp" 42 #include "stack_zero.inline.hpp" 43 #ifdef COMPILER2 44 #include "opto/runtime.hpp" 45 #endif 46 47 // For SafeFetch we need POSIX tls and setjmp 48 #include <setjmp.h> 49 #include <pthread.h> 50 static pthread_key_t g_jmpbuf_key; 51 52 // return the currently active jump buffer for this thread 53 // - if there is any, NULL otherwise. Called from 54 // zero signal handlers. 55 extern sigjmp_buf* get_jmp_buf_for_continuation() { 56 return (sigjmp_buf*) pthread_getspecific(g_jmpbuf_key); 57 } 58 59 // Declaration and definition of StubGenerator (no .hpp file). 60 // For a more detailed description of the stub routine structure 61 // see the comment in stubRoutines.hpp 62 63 class StubGenerator: public StubCodeGenerator { 64 private: 65 // The call stub is used to call Java from C 66 static void call_stub( 67 JavaCallWrapper *call_wrapper, 68 intptr_t* result, 69 BasicType result_type, 70 Method* method, 71 address entry_point, 72 intptr_t* parameters, 73 int parameter_words, 74 TRAPS) { 75 JavaThread *thread = (JavaThread *) THREAD; 76 ZeroStack *stack = thread->zero_stack(); 77 78 // Make sure we have no pending exceptions 79 assert(!HAS_PENDING_EXCEPTION, "call_stub called with pending exception"); 80 81 // Set up the stack if necessary 82 bool stack_needs_teardown = false; 83 if (stack->needs_setup()) { 84 size_t zero_stack_size = stack->suggest_size(thread); 85 stack->setup(alloca(zero_stack_size), zero_stack_size); 86 stack_needs_teardown = true; 87 } 88 89 // Allocate and initialize our frame 90 EntryFrame *frame = 91 EntryFrame::build(parameters, parameter_words, call_wrapper, THREAD); 92 93 if (!HAS_PENDING_EXCEPTION) { 94 // Push the frame 95 thread->push_zero_frame(frame); 96 97 // Make the call 98 Interpreter::invoke_method(method, entry_point, THREAD); 99 100 // Store the result 101 if (!HAS_PENDING_EXCEPTION) { 102 switch (result_type) { 103 case T_INT: 104 *(jint *) result = *(jint *) stack->sp(); 105 break; 106 case T_LONG: 107 *(jlong *) result = *(jlong *) stack->sp(); 108 break; 109 case T_FLOAT: 110 *(jfloat *) result = *(jfloat *) stack->sp(); 111 break; 112 case T_DOUBLE: 113 *(jdouble *) result = *(jdouble *) stack->sp(); 114 break; 115 case T_OBJECT: 116 *(oop *) result = *(oop *) stack->sp(); 117 break; 118 default: 119 ShouldNotReachHere(); 120 } 121 } 122 123 // Unwind the frame 124 thread->pop_zero_frame(); 125 } 126 127 // Tear down the stack if necessary 128 if (stack_needs_teardown) 129 stack->teardown(); 130 } 131 132 // These stubs get called from some dumb test routine. 133 // I'll write them properly when they're called from 134 // something that's actually doing something. 135 static void fake_arraycopy_stub(address src, address dst, int count) { 136 assert(count == 0, "huh?"); 137 } 138 139 void generate_arraycopy_stubs() { 140 // Call the conjoint generation methods immediately after 141 // the disjoint ones so that short branches from the former 142 // to the latter can be generated. 143 StubRoutines::_jbyte_disjoint_arraycopy = (address) fake_arraycopy_stub; 144 StubRoutines::_jbyte_arraycopy = (address) fake_arraycopy_stub; 145 146 StubRoutines::_jshort_disjoint_arraycopy = (address) fake_arraycopy_stub; 147 StubRoutines::_jshort_arraycopy = (address) fake_arraycopy_stub; 148 149 StubRoutines::_jint_disjoint_arraycopy = (address) fake_arraycopy_stub; 150 StubRoutines::_jint_arraycopy = (address) fake_arraycopy_stub; 151 152 StubRoutines::_jlong_disjoint_arraycopy = (address) fake_arraycopy_stub; 153 StubRoutines::_jlong_arraycopy = (address) fake_arraycopy_stub; 154 155 StubRoutines::_oop_disjoint_arraycopy = ShouldNotCallThisStub(); 156 StubRoutines::_oop_arraycopy = ShouldNotCallThisStub(); 157 158 StubRoutines::_checkcast_arraycopy = ShouldNotCallThisStub(); 159 StubRoutines::_unsafe_arraycopy = ShouldNotCallThisStub(); 160 StubRoutines::_generic_arraycopy = ShouldNotCallThisStub(); 161 162 // We don't generate specialized code for HeapWord-aligned source 163 // arrays, so just use the code we've already generated 164 StubRoutines::_arrayof_jbyte_disjoint_arraycopy = 165 StubRoutines::_jbyte_disjoint_arraycopy; 166 StubRoutines::_arrayof_jbyte_arraycopy = 167 StubRoutines::_jbyte_arraycopy; 168 169 StubRoutines::_arrayof_jshort_disjoint_arraycopy = 170 StubRoutines::_jshort_disjoint_arraycopy; 171 StubRoutines::_arrayof_jshort_arraycopy = 172 StubRoutines::_jshort_arraycopy; 173 174 StubRoutines::_arrayof_jint_disjoint_arraycopy = 175 StubRoutines::_jint_disjoint_arraycopy; 176 StubRoutines::_arrayof_jint_arraycopy = 177 StubRoutines::_jint_arraycopy; 178 179 StubRoutines::_arrayof_jlong_disjoint_arraycopy = 180 StubRoutines::_jlong_disjoint_arraycopy; 181 StubRoutines::_arrayof_jlong_arraycopy = 182 StubRoutines::_jlong_arraycopy; 183 184 StubRoutines::_arrayof_oop_disjoint_arraycopy = 185 StubRoutines::_oop_disjoint_arraycopy; 186 StubRoutines::_arrayof_oop_arraycopy = 187 StubRoutines::_oop_arraycopy; 188 } 189 190 static int SafeFetch32(int *adr, int errValue) { 191 192 // set up a jump buffer; anchor the pointer to the jump buffer in tls; then 193 // do the pointer access. If pointer is invalid, we crash; in signal 194 // handler, we retrieve pointer to jmp buffer from tls, and jump back. 195 // 196 // Note: the jump buffer itself - which can get pretty large depending on 197 // the architecture - lives on the stack and that is fine, because we will 198 // not rewind the stack: either we crash, in which case signal handler 199 // frame is below us, or we don't crash, in which case it does not matter. 200 sigjmp_buf jb; 201 if (sigsetjmp(jb, 1)) { 202 // we crashed. clean up tls and return default value. 203 pthread_setspecific(g_jmpbuf_key, NULL); 204 return errValue; 205 } else { 206 // preparation phase 207 pthread_setspecific(g_jmpbuf_key, &jb); 208 } 209 210 int value = errValue; 211 value = *adr; 212 213 // all went well. clean tls. 214 pthread_setspecific(g_jmpbuf_key, NULL); 215 216 return value; 217 } 218 219 static intptr_t SafeFetchN(intptr_t *adr, intptr_t errValue) { 220 221 sigjmp_buf jb; 222 if (sigsetjmp(jb, 1)) { 223 // we crashed. clean up tls and return default value. 224 pthread_setspecific(g_jmpbuf_key, NULL); 225 return errValue; 226 } else { 227 // preparation phase 228 pthread_setspecific(g_jmpbuf_key, &jb); 229 } 230 231 intptr_t value = errValue; 232 value = *adr; 233 234 // all went well. clean tls. 235 pthread_setspecific(g_jmpbuf_key, NULL); 236 237 return value; 238 239 } 240 241 void generate_initial() { 242 // Generates all stubs and initializes the entry points 243 244 // entry points that exist in all platforms Note: This is code 245 // that could be shared among different platforms - however the 246 // benefit seems to be smaller than the disadvantage of having a 247 // much more complicated generator structure. See also comment in 248 // stubRoutines.hpp. 249 250 StubRoutines::_forward_exception_entry = ShouldNotCallThisStub(); 251 StubRoutines::_call_stub_entry = (address) call_stub; 252 StubRoutines::_catch_exception_entry = ShouldNotCallThisStub(); 253 254 // atomic calls 255 StubRoutines::_atomic_xchg_entry = ShouldNotCallThisStub(); 256 StubRoutines::_atomic_xchg_ptr_entry = ShouldNotCallThisStub(); 257 StubRoutines::_atomic_cmpxchg_entry = ShouldNotCallThisStub(); 258 StubRoutines::_atomic_cmpxchg_ptr_entry = ShouldNotCallThisStub(); 259 StubRoutines::_atomic_cmpxchg_byte_entry = ShouldNotCallThisStub(); 260 StubRoutines::_atomic_cmpxchg_long_entry = ShouldNotCallThisStub(); 261 StubRoutines::_atomic_add_entry = ShouldNotCallThisStub(); 262 StubRoutines::_atomic_add_ptr_entry = ShouldNotCallThisStub(); 263 StubRoutines::_fence_entry = ShouldNotCallThisStub(); 264 } 265 266 void generate_all() { 267 // Generates all stubs and initializes the entry points 268 269 // These entry points require SharedInfo::stack0 to be set up in 270 // non-core builds and need to be relocatable, so they each 271 // fabricate a RuntimeStub internally. 272 StubRoutines::_throw_AbstractMethodError_entry = 273 ShouldNotCallThisStub(); 274 275 StubRoutines::_throw_NullPointerException_at_call_entry = 276 ShouldNotCallThisStub(); 277 278 StubRoutines::_throw_StackOverflowError_entry = 279 ShouldNotCallThisStub(); 280 281 // support for verify_oop (must happen after universe_init) 282 StubRoutines::_verify_oop_subroutine_entry = 283 ShouldNotCallThisStub(); 284 285 // arraycopy stubs used by compilers 286 generate_arraycopy_stubs(); 287 288 // Safefetch stubs. 289 pthread_key_create(&g_jmpbuf_key, NULL); 290 StubRoutines::_safefetch32_entry = CAST_FROM_FN_PTR(address, StubGenerator::SafeFetch32); 291 StubRoutines::_safefetch32_fault_pc = NULL; 292 StubRoutines::_safefetch32_continuation_pc = NULL; 293 294 StubRoutines::_safefetchN_entry = CAST_FROM_FN_PTR(address, StubGenerator::SafeFetchN); 295 StubRoutines::_safefetchN_fault_pc = NULL; 296 StubRoutines::_safefetchN_continuation_pc = NULL; 297 } 298 299 public: 300 StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) { 301 if (all) { 302 generate_all(); 303 } else { 304 generate_initial(); 305 } 306 } 307 }; 308 309 void StubGenerator_generate(CodeBuffer* code, bool all) { 310 StubGenerator g(code, all); 311 } 312 313 EntryFrame *EntryFrame::build(const intptr_t* parameters, 314 int parameter_words, 315 JavaCallWrapper* call_wrapper, 316 TRAPS) { 317 318 ZeroStack *stack = ((JavaThread *) THREAD)->zero_stack(); 319 stack->overflow_check(header_words + parameter_words, CHECK_NULL); 320 321 stack->push(0); // next_frame, filled in later 322 intptr_t *fp = stack->sp(); 323 assert(fp - stack->sp() == next_frame_off, "should be"); 324 325 stack->push(ENTRY_FRAME); 326 assert(fp - stack->sp() == frame_type_off, "should be"); 327 328 stack->push((intptr_t) call_wrapper); 329 assert(fp - stack->sp() == call_wrapper_off, "should be"); 330 331 for (int i = 0; i < parameter_words; i++) 332 stack->push(parameters[i]); 333 334 return (EntryFrame *) fp; 335 }