Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/runtime/sparc/SPARCFrame.java @ 4008:8187c94a9a87
7093690: JSR292: SA-JDI AssertionFailure: Expected raw sp likely got real sp, value was
Reviewed-by: kvn, twisti
| author | never |
|---|---|
| date | Mon, 17 Oct 2011 11:00:41 -0700 |
| parents | 7588156f5cf9 |
| children | 1d7922586cf6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.runtime.sparc; | |
| 26 | |
| 27 import java.util.*; | |
| 28 | |
| 29 import sun.jvm.hotspot.asm.sparc.*; | |
| 30 import sun.jvm.hotspot.code.*; | |
| 31 import sun.jvm.hotspot.compiler.*; | |
| 32 import sun.jvm.hotspot.debugger.*; | |
| 33 import sun.jvm.hotspot.debugger.cdbg.*; | |
| 34 import sun.jvm.hotspot.oops.*; | |
| 35 import sun.jvm.hotspot.runtime.*; | |
| 36 import sun.jvm.hotspot.runtime.posix.*; | |
| 37 import sun.jvm.hotspot.types.*; | |
| 38 import sun.jvm.hotspot.utilities.*; | |
| 39 | |
| 40 /** Specialization of and implementation of abstract methods of the | |
| 41 Frame class for the SPARC CPU. (FIXME: this is as quick a port as | |
| 42 possible to get things running; will have to do a better job right | |
| 43 away.) */ | |
| 44 | |
| 45 public class SPARCFrame extends Frame { | |
| 46 // The pc value is the raw return address, plus 8 (pcReturnOffset()). | |
| 47 // the value of sp and youngerSP that is stored in this object | |
| 48 // is always, always, always the value that would be found in the | |
| 49 // register (or window save area) while the target VM was executing. | |
| 50 // The caller of the constructor will alwasy know if has a biased or | |
| 51 // unbiased version of the stack pointer and can convert real (unbiased) | |
| 52 // value via a helper routine we supply. | |
| 53 // Whenever we return sp or youngerSP values we do not return the internal | |
| 54 // value but the real (unbiased) pointers since these are the true, usable | |
| 55 // memory addresses. The outlier case is that of the null pointer. The current | |
| 56 // mechanism makes null pointers always look null whether biased or not. | |
| 57 // This seems to cause no problems. In theory null real pointers could be biased | |
| 58 // just like other values however this has impact on things like addOffsetTo() | |
| 59 // to be able to take an Address that represents null and add an offset to it. | |
| 60 // This doesn't seem worth the bother and the impact on the rest of the code | |
| 61 // when the biasSP and unbiasSP can make this invisible. | |
| 62 // | |
| 63 // The general rule in this code is that when we have a variable like FP, youngerSP, SP | |
| 64 // that these are real (i.e. unbiased) addresses. The instance variables in a Frame are | |
| 65 // always raw values. The other rule is that it except for the frame constructors and | |
| 66 // the unBiasSP helper all methods accept parameters that are real addresses. | |
| 67 // | |
| 68 | |
| 69 /** Optional next-younger SP (used to locate O7, the PC) */ | |
| 70 private Address raw_youngerSP; | |
| 71 | |
| 72 /** Intepreter adjusts the stack pointer to make all locals contiguous */ | |
| 73 private long interpreterSPAdjustmentOffset; | |
| 74 | |
| 75 /** Number of stack entries for longs */ | |
| 76 private static final int WORDS_PER_LONG = 2; | |
| 77 | |
| 78 /** Normal SPARC return is 2 words past PC */ | |
| 79 public static final int PC_RETURN_OFFSET = 8; | |
| 80 | |
| 81 /** Size of each block, in order of increasing address */ | |
| 82 public static final int REGISTER_SAVE_WORDS = 16; | |
| 83 // FIXME: read these from the remote process | |
| 84 //#ifdef _LP64 | |
| 85 // callee_aggregate_return_pointer_words = 0, | |
| 86 //#else | |
| 87 // callee_aggregate_return_pointer_words = 1, | |
| 88 //#endif | |
| 89 public static final int CALLEE_AGGREGATE_RETURN_POINTER_WORDS = 1; | |
| 90 public static final int CALLEE_REGISTER_ARGUMENT_SAVE_AREA_WORDS = 6; | |
| 91 | |
| 92 // offset of each block, in order of increasing address: | |
| 93 public static final int REGISTER_SAVE_WORDS_SP_OFFSET = 0; | |
| 94 public static final int CALLEE_AGGREGATE_RETURN_POINTER_SP_OFFSET = REGISTER_SAVE_WORDS_SP_OFFSET + REGISTER_SAVE_WORDS; | |
| 95 public static final int CALLEE_REGISTER_ARGUMENT_SAVE_AREA_SP_OFFSET = (CALLEE_AGGREGATE_RETURN_POINTER_SP_OFFSET + | |
| 96 CALLEE_AGGREGATE_RETURN_POINTER_WORDS); | |
| 97 public static final int MEMORY_PARAMETER_WORD_SP_OFFSET = (CALLEE_REGISTER_ARGUMENT_SAVE_AREA_SP_OFFSET + | |
| 98 CALLEE_REGISTER_ARGUMENT_SAVE_AREA_WORDS); | |
| 99 public static final int VARARGS_OFFSET = MEMORY_PARAMETER_WORD_SP_OFFSET; | |
| 100 | |
| 101 private static final boolean DEBUG = System.getProperty("sun.jvm.hotspot.runtime.sparc.SPARCFrame.DEBUG") != null; | |
| 102 | |
| 103 public static Address unBiasSP(Address raw_sp) { | |
| 104 if (raw_sp != null) { | |
| 105 return raw_sp.addOffsetTo(VM.getVM().getStackBias()); | |
| 106 } else { | |
| 107 return null; | |
| 108 } | |
| 109 } | |
| 110 | |
| 111 public static Address biasSP(Address real_sp) { | |
| 112 if (real_sp != null) { | |
| 113 if (DEBUG) { | |
| 114 System.out.println("biasing realsp: " + real_sp + " biased: " + real_sp.addOffsetTo(-VM.getVM().getStackBias()) ); | |
| 115 } | |
| 116 return real_sp.addOffsetTo(-VM.getVM().getStackBias()); | |
| 117 } else { | |
| 118 if (DEBUG) { | |
| 119 System.out.println("biasing null realsp"); | |
| 120 } | |
| 121 return null; | |
| 122 } | |
| 123 } | |
| 124 // | |
| 125 // This is used to find the younger sp for a thread thatn has stopped but hasn't | |
| 126 // conveniently told us the information where we can find the pc or the frame | |
| 127 // containing the pc that corresponds to last_java_sp. This method will walk | |
| 128 // the frames trying to find the frame which we contains the data we need. | |
| 129 // | |
| 130 public static Address findYoungerSP(Address top, Address find) { | |
| 131 // top and find are unBiased sp values | |
| 132 // we return an unBiased value | |
| 133 Address findRaw = biasSP(find); | |
| 134 if (top == null || find == null || findRaw == null) { | |
| 135 throw new RuntimeException("bad values for findYoungerSP top: " + top + " find: " + find); | |
| 136 } | |
| 137 // It would be unusual to find more than 20 native frames before we find the java frame | |
| 138 // we are looking for. | |
| 139 final int maxFrames = 20; | |
| 140 int count = 0; | |
| 141 Address search = top; | |
| 142 Address next; | |
| 143 Address pc; | |
| 144 if (DEBUG) { | |
| 145 System.out.println("findYoungerSP top: " + top + " find: " + find + " findRaw: " + findRaw); | |
| 146 } | |
| 147 while ( count != maxFrames && search != null) { | |
| 148 next = search.getAddressAt(SPARCRegisters.I6.spOffsetInSavedWindow()); | |
| 149 pc = search.getAddressAt(SPARCRegisters.I7.spOffsetInSavedWindow()); | |
| 150 if (DEBUG) { | |
| 151 System.out.println("findYoungerSP next: " + next + " pc: " + pc); | |
| 152 } | |
| 153 if (next.equals(findRaw)) { | |
| 154 return search; | |
| 155 } | |
| 156 search = unBiasSP(next); | |
| 157 } | |
| 158 if (DEBUG) { | |
| 159 System.out.println("findYoungerSP: never found younger, top: " + top + " find: " + find); | |
| 160 } | |
| 161 return null; | |
| 162 } | |
| 163 | |
| 164 public Address getSP() { | |
| 165 if (DEBUG) { | |
| 166 System.out.println("getSP raw: " + raw_sp + " unbiased: " + unBiasSP(raw_sp)); | |
| 167 } | |
| 168 return unBiasSP(raw_sp); | |
| 169 } | |
| 170 | |
| 171 public Address getID() { | |
| 172 return getSP(); | |
| 173 } | |
| 174 | |
| 175 public Address getYoungerSP() { | |
| 176 if (DEBUG) { | |
| 177 System.out.println("getYoungerSP: " + raw_youngerSP + " unbiased: " + unBiasSP(raw_youngerSP)); | |
| 178 } | |
| 179 return unBiasSP(raw_youngerSP); | |
| 180 } | |
| 181 | |
| 182 /** This constructor relies on the fact that the creator of a frame | |
| 183 has flushed register windows which the frame will refer to, and | |
| 184 that those register windows will not be reloaded until the frame | |
| 185 is done reading and writing the stack. Moreover, if the | |
| 186 "younger_pc" argument points into the register save area of the | |
| 187 next younger frame (though it need not), the register window for | |
| 188 that next younger frame must also stay flushed. (The caller is | |
| 189 responsible for ensuring this.) */ | |
| 190 public SPARCFrame(Address raw_sp, Address raw_youngerSP, boolean youngerFrameIsInterpreted) { | |
| 191 super(); | |
| 192 if (DEBUG) { | |
| 193 System.out.println("Constructing frame(1) raw_sp: " + raw_sp + " raw_youngerSP: " + raw_youngerSP); | |
| 194 } | |
| 195 if (Assert.ASSERTS_ENABLED) { | |
| 196 Assert.that((unBiasSP(raw_sp).andWithMask(VM.getVM().getAddressSize() - 1) == null), | |
| 197 "Expected raw sp likely got real sp, value was " + raw_sp); | |
| 198 if (raw_youngerSP != null) { | |
| 199 Assert.that((unBiasSP(raw_youngerSP).andWithMask(VM.getVM().getAddressSize() - 1) == null), | |
| 200 "Expected raw youngerSP likely got real youngerSP, value was " + raw_youngerSP); | |
| 201 } | |
| 202 } | |
| 203 this.raw_sp = raw_sp; | |
| 204 this.raw_youngerSP = raw_youngerSP; | |
| 205 if (raw_youngerSP == null) { | |
| 206 // make a deficient frame which doesn't know where its PC is | |
| 207 pc = null; | |
| 208 } else { | |
| 209 Address youngerSP = unBiasSP(raw_youngerSP); | |
| 210 pc = youngerSP.getAddressAt(SPARCRegisters.I7.spOffsetInSavedWindow()).addOffsetTo(PC_RETURN_OFFSET); | |
| 211 | |
| 212 if (Assert.ASSERTS_ENABLED) { | |
| 213 Assert.that(youngerSP.getAddressAt(SPARCRegisters.FP.spOffsetInSavedWindow()). | |
| 214 equals(raw_sp), | |
| 215 "youngerSP must be valid"); | |
| 216 } | |
| 217 } | |
| 218 | |
| 219 if (youngerFrameIsInterpreted) { | |
| 220 long IsavedSP = SPARCRegisters.IsavedSP.spOffsetInSavedWindow(); | |
| 221 // compute adjustment to this frame's SP made by its interpreted callee | |
| 222 interpreterSPAdjustmentOffset = 0; | |
| 223 Address savedSP = unBiasSP(getYoungerSP().getAddressAt(IsavedSP)); | |
| 224 if (savedSP == null) { | |
| 225 if ( DEBUG) { | |
| 226 System.out.println("WARNING: IsavedSP was null for frame " + this); | |
| 227 } | |
| 228 } else { | |
| 229 interpreterSPAdjustmentOffset = savedSP.minus(getSP()); | |
| 230 } | |
| 231 } else { | |
| 232 interpreterSPAdjustmentOffset = 0; | |
| 233 } | |
| 234 if ( pc != null) { | |
| 235 // Look for a deopt pc and if it is deopted convert to original pc | |
| 236 CodeBlob cb = VM.getVM().getCodeCache().findBlob(pc); | |
| 237 if (cb != null && cb.isJavaMethod()) { | |
| 238 NMethod nm = (NMethod) cb; | |
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239 if (pc.equals(nm.deoptHandlerBegin())) { |
| 0 | 240 // adjust pc if frame is deoptimized. |
| 241 pc = this.getUnextendedSP().getAddressAt(nm.origPCOffset()); | |
| 242 deoptimized = true; | |
| 243 } | |
| 244 } | |
| 245 } | |
| 246 } | |
| 247 | |
| 248 /** Make a deficient frame which doesn't know where its PC is (note | |
| 249 no youngerSP argument) */ | |
| 250 public SPARCFrame(Address raw_sp, Address pc) { | |
| 251 super(); | |
| 252 if (DEBUG) { | |
| 253 System.out.println("Constructing frame(2) raw_sp: " + raw_sp ); | |
| 254 } | |
| 255 this.raw_sp = raw_sp; | |
| 256 if (Assert.ASSERTS_ENABLED) { | |
| 257 Assert.that((unBiasSP(raw_sp).andWithMask(VM.getVM().getAddressSize() - 1) == null), | |
| 258 "Expected raw sp likely got real sp, value was " + raw_sp); | |
| 259 } | |
| 260 raw_youngerSP = null; | |
| 261 this.pc = pc; | |
| 262 interpreterSPAdjustmentOffset = 0; | |
| 263 } | |
| 264 | |
| 265 /** Only used internally */ | |
| 266 private SPARCFrame() { | |
| 267 } | |
| 268 | |
| 269 public Object clone() { | |
| 270 SPARCFrame frame = new SPARCFrame(); | |
| 271 frame.raw_sp = raw_sp; | |
| 272 frame.pc = pc; | |
| 273 frame.raw_youngerSP = raw_youngerSP; | |
| 274 frame.interpreterSPAdjustmentOffset = interpreterSPAdjustmentOffset; | |
| 275 frame.deoptimized = deoptimized; | |
| 276 return frame; | |
| 277 } | |
| 278 | |
| 279 public boolean equals(Object arg) { | |
| 280 if (arg == null) { | |
| 281 return false; | |
| 282 } | |
| 283 | |
| 284 if (!(arg instanceof SPARCFrame)) { | |
| 285 return false; | |
| 286 } | |
| 287 | |
| 288 SPARCFrame other = (SPARCFrame) arg; | |
| 289 | |
| 290 return (AddressOps.equal(getSP(), other.getSP()) && | |
| 291 AddressOps.equal(getFP(), other.getFP()) && | |
| 292 AddressOps.equal(getPC(), other.getPC())); | |
| 293 } | |
| 294 | |
| 295 public int hashCode() { | |
| 296 if (raw_sp == null) { | |
| 297 return 0; | |
| 298 } | |
| 299 | |
| 300 return raw_sp.hashCode(); | |
| 301 } | |
| 302 | |
| 303 public String toString() { | |
| 304 Address fp = getFP(); | |
| 305 Address sp = getSP(); | |
| 306 Address youngerSP = getYoungerSP(); | |
| 307 | |
| 308 return "sp: " + (sp == null? "null" : sp.toString()) + | |
| 309 ", younger_sp: " + (youngerSP == null? "null" : youngerSP.toString()) + | |
| 310 ", fp: " + (fp == null? "null" : fp.toString()) + | |
| 311 ", pc: " + (pc == null? "null" : pc.toString()); | |
| 312 } | |
| 313 | |
| 314 /** <P> Identifies a signal handler frame on the stack. </P> | |
| 315 | |
| 316 <P> There are a few different algorithms for doing this, and | |
| 317 they vary from platform to platform. For example, based on a | |
| 318 conversation with Dave Dice, Solaris/x86 will be substantially | |
| 319 simpler to handle than Solaris/SPARC because the signal handler | |
| 320 frame can be identified because of a program counter == -1. </P> | |
| 321 | |
| 322 <P> The dbx group provided code and advice on these topics; the | |
| 323 code below evolved from theirs, but is not correct/robust. | |
| 324 Without going into too many details, it seems that looking for | |
| 325 the incoming argument to the sigacthandler frame (which is what | |
| 326 this code identifies) is not guaranteed to be stable across | |
| 327 versions of Solaris, since that function is supplied by | |
| 328 libthread and is not guaranteed not to clobber I2 before it | |
| 329 calls __sighndlr later. From discussions, it sounds like a | |
| 330 robust algorithm which wouldn't require traversal of the | |
| 331 ucontext chain (used by dbx, but which Dave Dice thinks isn't | |
| 332 robust in the face of libthread -- need to follow up) would be | |
| 333 to be able to properly identify the __sighndlr frame, then get | |
| 334 I2 and treat that as a ucontext. To identify __sighndlr we would | |
| 335 need to look up that symbol in the remote process and look for a | |
| 336 program counter within a certain (small) distance. </P> | |
| 337 | |
| 338 <P> If the underlying Debugger supports CDebugger interface, we | |
| 339 take the approach of __sighnldr symbol. This approach is more robust | |
| 340 compared to the original hueristic approach. Of course, if there | |
| 341 is no CDebugger support, we fallback to the hueristic approach. </P> | |
| 342 | |
| 343 <P> The current implementation seems to work with Solaris 2.8. | |
| 344 A nice property of this system is that if we find a core file | |
| 345 this algorithm doesn't work on, we can change the code and try | |
| 346 again, so I'm putting this in as the current mechanism for | |
| 347 finding signal handler frames on Solaris/SPARC. </P> */ | |
| 348 public boolean isSignalHandlerFrameDbg() { | |
| 349 CDebugger cdbg = VM.getVM().getDebugger().getCDebugger(); | |
| 350 if (cdbg != null) { | |
| 351 LoadObject dso = cdbg.loadObjectContainingPC(getPC()); | |
| 352 if (dso != null) { | |
| 353 ClosestSymbol cs = dso.closestSymbolToPC(getPC()); | |
| 354 if (cs != null && cs.getName().equals("__sighndlr")) { | |
| 355 return true; | |
| 356 } else { | |
| 357 return false; | |
| 358 } | |
| 359 } else { | |
| 360 return false; | |
| 361 } | |
| 362 } else { | |
| 363 if (getYoungerSP() == null) { | |
| 364 // System.err.println(" SPARCFrame.isSignalHandlerFrameDbg: youngerSP = " + getYoungerSP()); | |
| 365 return false; | |
| 366 } | |
| 367 Address i2 = getSP().getAddressAt(SPARCRegisters.I2.spOffsetInSavedWindow()); | |
| 368 if (i2 == null) { | |
| 369 return false; | |
| 370 } | |
| 371 Address fp = getFP(); | |
| 372 // My (mistaken) understanding of the dbx group's code was that | |
| 373 // the signal handler frame could be identified by testing the | |
| 374 // incoming argument to see whether it was a certain distance | |
| 375 // below the frame pointer; in fact, their code did substantially | |
| 376 // more than this (traversal of the ucontext chain, which this | |
| 377 // code can't do because the topmost ucontext is not currently | |
| 378 // available via the proc_service APIs in dbx). The current code | |
| 379 // appears to work, but is probably not robust. | |
| 380 int MAJOR_HACK_OFFSET = 8; // Difference between expected location of the ucontext and reality | |
| 381 // System.err.println(" SPARCFrame.isSignalHandlerFrameDbg: I2 = " + i2 + | |
| 382 // ", fp = " + fp + ", raw_youngerSP = " + getYoungerSP()); | |
| 383 boolean res = i2.equals(fp.addOffsetTo(VM.getVM().getAddressSize() * (REGISTER_SAVE_WORDS + MAJOR_HACK_OFFSET))); | |
| 384 if (res) { | |
| 385 // Qualify this with another test (FIXME: this is a gross heuristic found while testing) | |
| 386 Address sigInfoAddr = getSP().getAddressAt(SPARCRegisters.I5.spOffsetInSavedWindow()); | |
| 387 if (sigInfoAddr == null) { | |
| 388 System.err.println("Frame with fp = " + fp + " looked like a signal handler frame but wasn't"); | |
| 389 res = false; | |
| 390 } | |
| 391 } | |
| 392 return res; | |
| 393 } | |
| 394 } | |
| 395 | |
| 396 public int getSignalNumberDbg() { | |
| 397 // From looking at the stack trace in dbx, it looks like the | |
| 398 // siginfo* comes into sigacthandler in I5. It would be much more | |
| 399 // robust to look at the __sighndlr frame instead, but we can't | |
| 400 // currently identify that frame. | |
| 401 | |
| 402 Address sigInfoAddr = getSP().getAddressAt(SPARCRegisters.I5.spOffsetInSavedWindow()); | |
| 403 // Read si_signo out of siginfo* | |
| 404 return (int) sigInfoAddr.getCIntegerAt(0, 4, false); | |
| 405 } | |
| 406 | |
| 407 public String getSignalNameDbg() { | |
| 408 return POSIXSignals.getSignalName(getSignalNumberDbg()); | |
| 409 } | |
| 410 | |
| 411 public boolean isInterpretedFrameValid() { | |
| 412 if (Assert.ASSERTS_ENABLED) { | |
| 413 Assert.that(isInterpretedFrame(), "Not an interpreted frame"); | |
| 414 } | |
| 415 // These are reasonable sanity checks | |
| 416 if (getFP() == null || (getFP().andWithMask(2 * VM.getVM().getAddressSize() - 1)) != null) { | |
| 417 return false; | |
| 418 } | |
| 419 if (getSP() == null || (getSP().andWithMask(2 * VM.getVM().getAddressSize() - 1)) != null) { | |
| 420 return false; | |
| 421 } | |
| 422 if (getFP().addOffsetTo(INTERPRETER_FRAME_VM_LOCAL_WORDS * VM.getVM().getAddressSize()).lessThan(getSP())) { | |
| 423 return false; | |
| 424 } | |
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425 |
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426 OopHandle methodHandle = addressOfInterpreterFrameMethod().getOopHandleAt(0); |
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427 |
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428 if (VM.getVM().getObjectHeap().isValidMethod(methodHandle) == false) { |
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429 return false; |
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430 } |
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431 |
| 0 | 432 // These are hacks to keep us out of trouble. |
| 433 // The problem with these is that they mask other problems | |
| 434 if (getFP().lessThanOrEqual(getSP())) { // this attempts to deal with unsigned comparison above | |
| 435 return false; | |
| 436 } | |
| 437 if (getFP().minus(getSP()) > 4096 * VM.getVM().getAddressSize()) { // stack frames shouldn't be large. | |
| 438 return false; | |
| 439 } | |
| 440 // FIXME: this is not atomic with respect to GC and is unsuitable | |
| 441 // for use in a non-debugging, or reflective, system. Need to | |
| 442 // figure out how to express this. | |
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443 Address bcx = addressOfInterpreterFrameBCX().getAddressAt(0); |
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444 |
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445 Method method; |
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446 try { |
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447 method = (Method) VM.getVM().getObjectHeap().newOop(methodHandle); |
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448 } catch (UnknownOopException ex) { |
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449 return false; |
| 0 | 450 } |
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451 int bci = bcpToBci(bcx, method); |
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452 //validate bci |
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453 if (bci < 0) return false; |
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454 |
| 0 | 455 return true; |
| 456 } | |
| 457 | |
| 458 //-------------------------------------------------------------------------------- | |
| 459 // Accessors: | |
| 460 // | |
| 461 | |
| 462 /** Accessors */ | |
| 463 | |
| 464 public long frameSize() { | |
| 465 return (getSenderSP().minus(getSP()) / VM.getVM().getAddressSize()); | |
| 466 } | |
| 467 | |
| 468 public Address getLink() { | |
| 469 return unBiasSP(getFP().getAddressAt(SPARCRegisters.FP.spOffsetInSavedWindow())); | |
| 470 } | |
| 471 | |
| 472 // FIXME: not implementable yet | |
| 473 // public void setLink(Address addr) { | |
| 474 // if (Assert.ASSERTS_ENABLED) { | |
| 475 // Assert.that(getLink().equals(addr), "frame nesting is controlled by hardware"); | |
| 476 // } | |
| 477 // } | |
| 478 | |
| 479 public Frame sender(RegisterMap regMap, CodeBlob cb) { | |
| 480 SPARCRegisterMap map = (SPARCRegisterMap) regMap; | |
| 481 | |
| 482 if (Assert.ASSERTS_ENABLED) { | |
| 483 Assert.that(map != null, "map must be set"); | |
| 484 } | |
| 485 | |
| 486 // Default is we don't have to follow them. The sender_for_xxx | |
| 487 // will update it accordingly | |
| 488 map.setIncludeArgumentOops(false); | |
| 489 | |
|
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490 if (isEntryFrame()) { |
| 0 | 491 return senderForEntryFrame(map); |
| 492 } | |
| 493 | |
| 494 Address youngerSP = getSP(); | |
| 495 Address sp = getSenderSP(); | |
| 496 boolean isInterpreted = false; | |
| 497 | |
| 498 // FIXME: this is a hack to get stackwalking to work in the face | |
| 499 // of a signal like a SEGV. For debugging purposes it's important | |
| 500 // that (a) we are able to traverse the stack if we take a signal | |
| 501 // and (b) that we get the correct program counter in this | |
| 502 // situation. If we are not using alternate signal stacks then (a) | |
| 503 // seems to work all the time (on SPARC), but (b) is violated for | |
| 504 // the frame just below the signal handler. | |
| 505 | |
| 506 // The mechanism for finding the ucontext is not robust. In | |
| 507 // addition, we may find that we need to be able to fetch more | |
| 508 // registers from the ucontext than just the program counter, | |
| 509 // since the register windows on the stack are "stale". This will | |
| 510 // require substantial restructuring of this frame code, so has | |
| 511 // been avoided for now. | |
| 512 | |
| 513 // It is difficult to find a clean solution for mixing debugging | |
| 514 // situations with VM frame traversal. One could consider | |
| 515 // implementing generic frame traversal in the dbx style and only | |
| 516 // using the VM's stack walking mechanism on a per-frame basis, | |
| 517 // for example to traverse Java-level activations in a compiled | |
| 518 // frame. However, this will probably not interact well with the | |
| 519 // mechanism for finding oops on the stack. | |
| 520 | |
| 521 if (VM.getVM().isDebugging()) { | |
| 522 // If we are a signal handler frame, use a trick: make the | |
| 523 // youngerSP of the caller frame point to the top of the | |
| 524 // ucontext's contained register set. This should allow fetching | |
| 525 // of the registers for the frame just below the signal handler | |
| 526 // frame in the usual fashion. | |
| 527 if (isSignalHandlerFrameDbg()) { | |
| 528 | |
| 529 if (DEBUG) { | |
| 530 System.out.println("SPARCFrame.sender: found signal handler frame"); | |
| 531 } | |
| 532 | |
| 533 // Try to give a valid SP and PC for a "deficient frame" since | |
| 534 // we don't have a real register save area; making this class | |
| 535 // work by reading its information from a ucontext as well as | |
| 536 // a register save area is a major undertaking and has been | |
| 537 // deferred for now. It is very important that the PC is | |
| 538 // correct, which is why we don't just fall through to the | |
| 539 // other code (which would read the PC from the stale register | |
| 540 // window and thereby fail to get the actual location of the | |
| 541 // fault). | |
| 542 | |
| 543 long offset = getMContextAreaOffsetInUContext(); | |
| 544 Address fp = sp; | |
| 545 // System.out.println(" FP: " + fp); | |
| 546 fp = fp.addOffsetTo(getUContextOffset() + getMContextAreaOffsetInUContext()); | |
| 547 // System.out.println(" start of mcontext: " + fp); | |
| 548 // FIXME: put these elsewhere. These are the register numbers | |
| 549 // in /usr/include/sys/regset.h. They might belong in | |
| 550 // SPARCReigsters.java, but we currently don't have that list | |
| 551 // of numbers in the SA code (because all of the registers are | |
| 552 // listed as instances of SPARCRegister) and it appears that | |
| 553 // our numbering of the registers and this one don't match up. | |
| 554 int PC_OFFSET_IN_GREGSET = 1; | |
| 555 int SP_OFFSET_IN_GREGSET = 17; | |
| 556 raw_sp = fp.getAddressAt(VM.getVM().getAddressSize() * SP_OFFSET_IN_GREGSET); | |
| 557 Address pc = fp.getAddressAt(VM.getVM().getAddressSize() * PC_OFFSET_IN_GREGSET); | |
| 558 return new SPARCFrame(raw_sp, pc); | |
| 559 } | |
| 560 } | |
| 561 | |
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562 // Note: The version of this operation on any platform with callee-save |
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563 // registers must update the register map (if not null). |
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564 // In order to do this correctly, the various subtypes of |
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565 // of frame (interpreted, compiled, glue, native), |
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566 // must be distinguished. There is no need on SPARC for |
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567 // such distinctions, because all callee-save registers are |
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568 // preserved for all frames via SPARC-specific mechanisms. |
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569 // |
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570 // *** HOWEVER, *** if and when we make any floating-point |
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571 // registers callee-saved, then we will have to copy over |
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572 // the RegisterMap update logic from the Intel code. |
| 0 | 573 |
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574 if (isRicochetFrame()) return senderForRicochetFrame(map); |
| 0 | 575 |
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576 // The constructor of the sender must know whether this frame is interpreted so it can set the |
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577 // sender's _interpreter_sp_adjustment field. |
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578 if (VM.getVM().getInterpreter().contains(pc)) { |
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579 isInterpreted = true; |
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580 map.makeIntegerRegsUnsaved(); |
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581 map.shiftWindow(sp, youngerSP); |
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582 } else { |
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583 // Find a CodeBlob containing this frame's pc or elide the lookup and use the |
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584 // supplied blob which is already known to be associated with this frame. |
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585 cb = VM.getVM().getCodeCache().findBlob(pc); |
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586 if (cb != null) { |
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587 // Update the location of all implicitly saved registers |
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588 // as the address of these registers in the register save |
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589 // area (for %o registers we use the address of the %i |
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590 // register in the next younger frame) |
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591 map.shiftWindow(sp, youngerSP); |
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592 if (map.getUpdateMap()) { |
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593 if (cb.callerMustGCArguments()) { |
| 0 | 594 map.setIncludeArgumentOops(true); |
| 595 } | |
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596 if (cb.getOopMaps() != null) { |
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597 OopMapSet.updateRegisterMap(this, cb, map, VM.getVM().isDebugging()); |
| 0 | 598 } |
| 599 } | |
| 600 } | |
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601 } |
| 0 | 602 |
| 603 return new SPARCFrame(biasSP(sp), biasSP(youngerSP), isInterpreted); | |
| 604 } | |
| 605 | |
| 606 protected boolean hasSenderPD() { | |
| 607 try { | |
| 608 // FIXME: should not happen!!! | |
| 609 if (getSP() == null) { | |
| 610 return false; | |
| 611 } | |
| 612 if ( unBiasSP(getSP().getAddressAt(SPARCRegisters.FP.spOffsetInSavedWindow())) == null ) { | |
| 613 return false; | |
| 614 } | |
| 615 return true; | |
| 616 } catch (RuntimeException e) { | |
| 617 if (DEBUG) { | |
| 618 System.out.println("Bad frame " + this); | |
| 619 } | |
| 620 throw e; | |
| 621 } | |
| 622 } | |
| 623 | |
| 624 //-------------------------------------------------------------------------------- | |
| 625 // Return address: | |
| 626 // | |
| 627 | |
| 628 public Address getSenderPC() { | |
| 629 return addressOfI7().getAddressAt(0).addOffsetTo(PC_RETURN_OFFSET); | |
| 630 } | |
| 631 | |
| 632 // FIXME: currently unimplementable | |
| 633 // inline void frame::set_sender_pc(address addr) { *I7_addr() = addr - pc_return_offset; } | |
| 634 | |
| 635 public Address getUnextendedSP() { | |
| 636 return getSP().addOffsetTo(interpreterSPAdjustmentOffset); | |
| 637 } | |
| 638 | |
| 639 public Address getSenderSP() { | |
| 640 return getFP(); | |
| 641 } | |
| 642 | |
| 643 /** Given the next-younger sp for a given frame's sp, compute the | |
| 644 frame. We need the next-younger sp, because its register save | |
| 645 area holds the flushed copy of its I7, which is the PC of the | |
| 646 frame we are interested in. */ | |
| 647 public SPARCFrame afterSave() { | |
| 648 return new SPARCFrame(biasSP(getYoungerSP()), null); | |
| 649 } | |
| 650 | |
| 651 /** Accessors for the instance variables */ | |
| 652 public Address getFP() { | |
| 653 Address sp = getSP(); | |
| 654 if (sp == null) { | |
| 655 System.out.println("SPARCFrame.getFP(): sp == null"); | |
| 656 } | |
| 657 Address fpAddr = sp.addOffsetTo(SPARCRegisters.FP.spOffsetInSavedWindow()); | |
| 658 try { | |
| 659 Address fp = unBiasSP(fpAddr.getAddressAt(0)); | |
| 660 if (fp == null) { | |
| 661 System.out.println("SPARCFrame.getFP(): fp == null (&fp == " + fpAddr + ")"); | |
| 662 } | |
| 663 return fp; | |
| 664 } catch (RuntimeException e) { | |
| 665 System.out.println("SPARCFrame.getFP(): is bad (&fp == " + fpAddr + " sp = " + sp + ")"); | |
| 666 return null; | |
| 667 } | |
| 668 } | |
| 669 | |
| 670 private Address addressOfFPSlot(int index) { | |
| 671 return getFP().addOffsetTo(index * VM.getVM().getAddressSize()); | |
| 672 } | |
| 673 | |
| 674 // FIXME: temporarily elided | |
| 675 // // All frames | |
| 676 // | |
| 677 // intptr_t* fp_addr_at(int index) const { return &fp()[index]; } | |
| 678 // intptr_t* sp_addr_at(int index) const { return &sp()[index]; } | |
| 679 // intptr_t fp_at( int index) const { return *fp_addr_at(index); } | |
| 680 // intptr_t sp_at( int index) const { return *sp_addr_at(index); } | |
| 681 // | |
| 682 // private: | |
| 683 // inline address* I7_addr() const; | |
| 684 // inline address* O7_addr() const; | |
| 685 // | |
| 686 // inline address* I0_addr() const; | |
| 687 // inline address* O0_addr() const; | |
| 688 // | |
| 689 // public: | |
| 690 // // access to SPARC arguments and argument registers | |
| 691 // | |
| 692 // intptr_t* register_addr(Register reg) const { | |
| 693 // return sp_addr_at(reg.sp_offset_in_saved_window()); | |
| 694 // } | |
| 695 // intptr_t* memory_param_addr(int param_ix, bool is_in) const { | |
| 696 // int offset = callee_register_argument_save_area_sp_offset + param_ix; | |
| 697 // if (is_in) | |
| 698 // return fp_addr_at(offset); | |
| 699 // else | |
| 700 // return sp_addr_at(offset); | |
| 701 // } | |
| 702 // intptr_t* param_addr(int param_ix, bool is_in) const { | |
| 703 // if (param_ix >= callee_register_argument_save_area_words) | |
| 704 // return memory_param_addr(param_ix, is_in); | |
| 705 // else if (is_in) | |
| 706 // return register_addr(Argument(param_ix, true).as_register()); | |
| 707 // else { | |
| 708 // // the registers are stored in the next younger frame | |
| 709 // // %%% is this really necessary? | |
| 710 // frame next_younger = after_save(); | |
| 711 // return next_younger.register_addr(Argument(param_ix, true).as_register()); | |
| 712 // } | |
| 713 // } | |
| 714 | |
| 715 //-------------------------------------------------------------------------------- | |
| 716 // Interpreter frames: | |
| 717 // | |
| 718 | |
| 719 /** 2 words, also used to save float regs across calls to C */ | |
| 720 public static final int INTERPRETER_FRAME_D_SCRATCH_FP_OFFSET = -2; | |
| 721 public static final int INTERPRETER_FRAME_L_SCRATCH_FP_OFFSET = -4; | |
| 722 /** For native calls only */ | |
| 723 public static final int INTERPRETER_FRAME_PADDING_OFFSET = -5; | |
| 724 /** For native calls only */ | |
| 725 public static final int INTERPRETER_FRAME_MIRROR_OFFSET = -6; | |
| 726 /** Should be same as above, and should be zero mod 8 */ | |
| 727 public static final int INTERPRETER_FRAME_VM_LOCALS_FP_OFFSET = -6; | |
| 728 public static final int INTERPRETER_FRAME_VM_LOCAL_WORDS = -INTERPRETER_FRAME_VM_LOCALS_FP_OFFSET; | |
| 729 | |
| 730 /** Interpreter frame set-up needs to save 2 extra words in outgoing | |
| 731 param area for class and jnienv arguments for native stubs (see | |
| 732 nativeStubGen_sparc.cpp) */ | |
| 733 public static final int INTERPRETER_FRAME_EXTRA_OUTGOING_ARGUMENT_WORDS = 2; | |
| 734 | |
| 735 // FIXME: elided for now | |
| 736 // | |
| 737 // // the compiler frame has many of the same fields as the interpreter frame | |
| 738 // // %%%%% factor out declarations of the shared fields | |
| 739 // enum compiler_frame_fixed_locals { | |
| 740 // compiler_frame_d_scratch_fp_offset = -2, | |
| 741 // compiler_frame_vm_locals_fp_offset = -2, // should be same as above | |
| 742 // | |
| 743 // compiler_frame_vm_local_words = -compiler_frame_vm_locals_fp_offset | |
| 744 // }; | |
| 745 // | |
| 746 // private: | |
| 747 // | |
| 748 // // where LcpoolCache is saved: | |
| 749 // constantPoolCacheOop* interpreter_frame_cpoolcache_addr() const { | |
| 750 // return (constantPoolCacheOop*)sp_addr_at( LcpoolCache.sp_offset_in_saved_window()); | |
| 751 // } | |
| 752 // | |
| 753 // // where Lmonitors is saved: | |
| 754 // BasicObjectLock** interpreter_frame_monitors_addr() const { | |
| 755 // return (BasicObjectLock**) sp_addr_at( Lmonitors.sp_offset_in_saved_window()); | |
| 756 // } | |
| 757 // intptr_t** interpreter_frame_esp_addr() const { | |
| 758 // return (intptr_t**)sp_addr_at( Lesp.sp_offset_in_saved_window()); | |
| 759 // } | |
| 760 // | |
| 761 // inline void interpreter_frame_set_tos_address(intptr_t* x); | |
| 762 // | |
| 763 // // next two fns read and write Lmonitors value, | |
| 764 // private: | |
| 765 // BasicObjectLock* interpreter_frame_monitors() const { return *interpreter_frame_monitors_addr(); } | |
| 766 // void interpreter_frame_set_monitors(BasicObjectLock* monitors) { *interpreter_frame_monitors_addr() = monitors; } | |
| 767 // | |
| 768 //#ifndef CORE | |
| 769 //inline oop *frame::pd_compiled_argument_to_location(VMReg::Name reg, RegisterMap reg_map, int arg_size) const { | |
| 770 // COMPILER1_ONLY(return (oop *) (arg_size - 1 - reg + sp() + memory_parameter_word_sp_offset); ) | |
| 771 // COMPILER2_ONLY(return oopmapreg_to_location(reg, ®_map); ) | |
| 772 //} | |
| 773 //#endif | |
| 774 | |
| 775 // FIXME: NOT FINISHED | |
| 776 public Address addressOfInterpreterFrameLocals() { | |
| 777 return getSP().addOffsetTo(SPARCRegisters.Llocals.spOffsetInSavedWindow()); | |
| 778 } | |
| 779 | |
| 780 // FIXME: this is not atomic with respect to GC and is unsuitable | |
| 781 // for use in a non-debugging, or reflective, system. | |
| 782 private Address addressOfInterpreterFrameBCX() { | |
| 783 // %%%%% reinterpreting Lbcp as a bcx | |
| 784 return getSP().addOffsetTo(SPARCRegisters.Lbcp.spOffsetInSavedWindow()); | |
| 785 } | |
| 786 | |
| 787 public int getInterpreterFrameBCI() { | |
| 788 // FIXME: this is not atomic with respect to GC and is unsuitable | |
| 789 // for use in a non-debugging, or reflective, system. Need to | |
| 790 // figure out how to express this. | |
| 791 Address bcp = addressOfInterpreterFrameBCX().getAddressAt(0); | |
| 792 OopHandle methodHandle = addressOfInterpreterFrameMethod().getOopHandleAt(0); | |
| 793 Method method = (Method) VM.getVM().getObjectHeap().newOop(methodHandle); | |
| 794 return bcpToBci(bcp, method); | |
| 795 } | |
| 796 | |
| 797 public Address addressOfInterpreterFrameExpressionStack() { | |
| 798 return addressOfInterpreterFrameMonitors().addOffsetTo(-1 * VM.getVM().getAddressSize()); | |
| 799 } | |
| 800 | |
| 801 public int getInterpreterFrameExpressionStackDirection() { | |
| 802 return -1; | |
| 803 } | |
| 804 | |
| 805 /** Top of expression stack */ | |
| 806 public Address addressOfInterpreterFrameTOS() { | |
| 807 return getSP().getAddressAt(SPARCRegisters.Lesp.spOffsetInSavedWindow()).addOffsetTo(VM.getVM().getAddressSize()); | |
| 808 } | |
| 809 | |
| 810 /** Expression stack from top down */ | |
| 811 public Address addressOfInterpreterFrameTOSAt(int slot) { | |
| 812 return addressOfInterpreterFrameTOS().addOffsetTo(slot * VM.getVM().getAddressSize()); | |
| 813 } | |
| 814 | |
| 815 public Address getInterpreterFrameSenderSP() { | |
| 816 if (Assert.ASSERTS_ENABLED) { | |
| 817 Assert.that(isInterpretedFrame(), "interpreted frame expected"); | |
| 818 } | |
| 819 return getFP(); | |
| 820 } | |
| 821 | |
| 822 // FIXME: elided for now | |
| 823 //inline void frame::interpreter_frame_set_tos_address( intptr_t* x ) { | |
| 824 // *interpreter_frame_esp_addr() = x - 1; | |
| 825 //} | |
| 826 | |
| 827 //-------------------------------------------------------------------------------- | |
| 828 // Monitors: | |
| 829 // | |
| 830 | |
| 831 private Address addressOfInterpreterFrameMonitors() { | |
| 832 return getSP().addOffsetTo(SPARCRegisters.Lmonitors.spOffsetInSavedWindow()).getAddressAt(0); | |
| 833 } | |
| 834 | |
| 835 // Monitors | |
| 836 public BasicObjectLock interpreterFrameMonitorBegin() { | |
| 837 int roundedVMLocalWords = Bits.roundTo(INTERPRETER_FRAME_VM_LOCAL_WORDS, WORDS_PER_LONG); | |
| 838 return new BasicObjectLock(addressOfFPSlot(-1 * roundedVMLocalWords)); | |
| 839 } | |
| 840 | |
| 841 public BasicObjectLock interpreterFrameMonitorEnd() { | |
| 842 return new BasicObjectLock(addressOfInterpreterFrameMonitors()); | |
| 843 } | |
| 844 | |
| 845 public int interpreterFrameMonitorSize() { | |
| 846 return Bits.roundTo(BasicObjectLock.size(), WORDS_PER_LONG * (int) VM.getVM().getAddressSize()); | |
| 847 } | |
| 848 | |
| 849 // FIXME: elided for now | |
| 850 // // monitor elements | |
| 851 // | |
| 852 // // in keeping with Intel side: end is lower in memory than begin; | |
| 853 // // and beginning element is oldest element | |
| 854 // // Also begin is one past last monitor. | |
| 855 // | |
| 856 // inline BasicObjectLock* frame::interpreter_frame_monitor_begin() const { | |
| 857 // int rounded_vm_local_words = round_to(frame::interpreter_frame_vm_local_words, WordsPerLong); | |
| 858 // return (BasicObjectLock *)fp_addr_at(-rounded_vm_local_words); | |
| 859 // } | |
| 860 // | |
| 861 // inline BasicObjectLock* frame::interpreter_frame_monitor_end() const { | |
| 862 // return interpreter_frame_monitors(); | |
| 863 // } | |
| 864 // | |
| 865 // | |
| 866 // inline void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) { | |
| 867 // interpreter_frame_set_monitors(value); | |
| 868 // } | |
| 869 // | |
| 870 // | |
| 871 // inline int frame::interpreter_frame_monitor_size() { | |
| 872 // return round_to(BasicObjectLock::size(), WordsPerLong); | |
| 873 // } | |
| 874 | |
| 875 public Address addressOfInterpreterFrameMethod() { | |
| 876 return getSP().addOffsetTo(SPARCRegisters.Lmethod.spOffsetInSavedWindow()); | |
| 877 } | |
| 878 | |
| 879 public Address addressOfInterpreterFrameCPCache() { | |
| 880 return getSP().addOffsetTo(SPARCRegisters.LcpoolCache.spOffsetInSavedWindow()); | |
| 881 } | |
| 882 | |
| 883 //-------------------------------------------------------------------------------- | |
| 884 // Entry frames: | |
| 885 // | |
| 886 | |
| 887 public JavaCallWrapper getEntryFrameCallWrapper() { | |
| 888 // Note: adjust this code if the link argument in StubGenerator::call_stub() changes! | |
| 889 SPARCArgument link = new SPARCArgument(0, false); | |
| 890 return (JavaCallWrapper) VMObjectFactory.newObject(JavaCallWrapper.class, | |
| 891 getSP().getAddressAt(link.asIn().asRegister().spOffsetInSavedWindow())); | |
| 892 } | |
| 893 | |
| 894 // | |
| 895 // | |
| 896 // inline JavaCallWrapper* frame::entry_frame_call_wrapper() const { | |
| 897 // // note: adjust this code if the link argument in StubGenerator::call_stub() changes! | |
| 898 // const Argument link = Argument(0, false); | |
| 899 // return (JavaCallWrapper*)sp()[link.as_in().as_register().sp_offset_in_saved_window()]; | |
| 900 // } | |
| 901 | |
| 902 //-------------------------------------------------------------------------------- | |
| 903 // Safepoints: | |
| 904 // | |
| 905 | |
| 906 protected Address addressOfSavedOopResult() { | |
| 907 return addressOfO0(); | |
| 908 } | |
| 909 | |
| 910 protected Address addressOfSavedReceiver() { | |
| 911 return addressOfO0(); | |
| 912 } | |
| 913 | |
| 914 | |
| 915 //-------------------------------------------------------------------------------- | |
| 916 // Internals only below this point | |
| 917 // | |
| 918 | |
| 919 private Address addressOfI7() { | |
| 920 return getSP().addOffsetTo(SPARCRegisters.I7.spOffsetInSavedWindow()); | |
| 921 } | |
| 922 | |
| 923 private Address addressOfO7() { | |
| 924 return afterSave().addressOfI7(); | |
| 925 } | |
| 926 | |
| 927 private Address addressOfI0() { | |
| 928 return getSP().addOffsetTo(SPARCRegisters.I0.spOffsetInSavedWindow()); | |
| 929 } | |
| 930 | |
| 931 private Address addressOfO0() { | |
| 932 return afterSave().addressOfI0(); | |
| 933 } | |
| 934 | |
| 935 private static boolean addressesEqual(Address a1, Address a2) { | |
| 936 if ((a1 == null) && (a2 == null)) { | |
| 937 return true; | |
| 938 } | |
| 939 | |
| 940 if ((a1 == null) || (a2 == null)) { | |
| 941 return false; | |
| 942 } | |
| 943 | |
| 944 return (a1.equals(a2)); | |
| 945 } | |
| 946 | |
| 947 | |
|
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948 private Frame senderForRicochetFrame(SPARCRegisterMap map) { |
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949 if (DEBUG) { |
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950 System.out.println("senderForRicochetFrame"); |
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951 } |
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952 //RicochetFrame* f = RicochetFrame::from_frame(fr); |
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953 // Cf. is_interpreted_frame path of frame::sender |
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954 Address youngerSP = getSP(); |
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955 Address sp = getSenderSP(); |
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956 map.makeIntegerRegsUnsaved(); |
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957 map.shiftWindow(sp, youngerSP); |
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958 boolean thisFrameAdjustedStack = true; // I5_savedSP is live in this RF |
|
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959 return new SPARCFrame(biasSP(sp), biasSP(youngerSP), thisFrameAdjustedStack); |
|
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960 } |
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961 |
| 0 | 962 private Frame senderForEntryFrame(RegisterMap regMap) { |
| 963 SPARCRegisterMap map = (SPARCRegisterMap) regMap; | |
| 964 | |
| 965 if (Assert.ASSERTS_ENABLED) { | |
| 966 Assert.that(map != null, "map must be set"); | |
| 967 } | |
| 968 // Java frame called from C; skip all C frames and return top C | |
| 969 // frame of that chunk as the sender | |
| 970 JavaCallWrapper jcw = getEntryFrameCallWrapper(); | |
| 971 if (Assert.ASSERTS_ENABLED) { | |
| 972 Assert.that(!entryFrameIsFirst(), "next Java fp must be non zero"); | |
| 973 Assert.that(jcw.getLastJavaSP().greaterThan(getSP()), "must be above this frame on stack"); | |
| 974 } | |
| 975 Address lastJavaSP = jcw.getLastJavaSP(); | |
| 976 Address lastJavaPC = jcw.getLastJavaPC(); | |
| 977 map.clear(); | |
| 978 | |
|
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979 map.makeIntegerRegsUnsaved(); |
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980 map.shiftWindow(lastJavaSP, null); |
| 0 | 981 |
| 982 if (Assert.ASSERTS_ENABLED) { | |
| 983 Assert.that(map.getIncludeArgumentOops(), "should be set by clear"); | |
| 984 } | |
| 985 | |
| 986 if (lastJavaPC != null) { | |
| 987 return new SPARCFrame(biasSP(lastJavaSP), lastJavaPC); | |
| 988 } else { | |
| 989 Address youngerSP = getNextYoungerSP(lastJavaSP, getSP()); | |
| 990 return new SPARCFrame(biasSP(lastJavaSP), biasSP(youngerSP), false); | |
| 991 } | |
| 992 } | |
| 993 | |
| 994 private static Address getNextYoungerSP(Address oldSP, Address youngSP) { | |
| 995 Address sp = getNextYoungerSPOrNull(oldSP, youngSP, null); | |
| 996 if (Assert.ASSERTS_ENABLED) { | |
| 997 Assert.that(sp != null, "missed the SP"); | |
| 998 } | |
| 999 return sp; | |
| 1000 } | |
| 1001 | |
| 1002 private static Address getNextYoungerSPOrNull(Address oldSP, Address youngSP, Address sp) { | |
| 1003 if (youngSP == null) { | |
| 1004 // FIXME | |
| 1005 throw new RuntimeException("can not handle null youngSP in debugging system (seems to require register window flush)"); | |
| 1006 } | |
| 1007 | |
| 1008 if (sp == null) { | |
| 1009 sp = youngSP; | |
| 1010 } | |
| 1011 | |
| 1012 Address previousSP = null; | |
| 1013 | |
| 1014 /** Minimum frame size is 16 */ | |
| 1015 int maxFrames = (int) (oldSP.minus(sp) / (16 * VM.getVM().getAddressSize())); | |
| 1016 | |
| 1017 while(!sp.equals(oldSP) && spIsValid(oldSP, youngSP, sp)) { | |
| 1018 if (maxFrames-- <= 0) { | |
| 1019 // too many frames have gone by; invalid parameters given to this function | |
| 1020 break; | |
| 1021 } | |
| 1022 previousSP = sp; | |
| 1023 sp = unBiasSP(sp.getAddressAt(SPARCRegisters.FP.spOffsetInSavedWindow())); | |
| 1024 } | |
| 1025 | |
| 1026 return (sp.equals(oldSP) ? previousSP : null); | |
| 1027 } | |
| 1028 | |
| 1029 private static boolean spIsValid(Address oldSP, Address youngSP, Address sp) { | |
| 1030 long mask = VM.getVM().getAddressSize(); | |
| 1031 mask = 2 * mask - 1; | |
| 1032 return ((sp.andWithMask(mask) == null) && | |
| 1033 (sp.lessThanOrEqual(oldSP)) && | |
| 1034 (sp.greaterThanOrEqual(youngSP))); | |
| 1035 } | |
| 1036 | |
| 1037 // FIXME: this is a hopefully temporary hack (not sure what is going on) | |
| 1038 public long getUContextOffset() { | |
| 1039 // FIXME: there is something I clearly don't understand about the | |
| 1040 // way the signal handler frame is laid out, because I shouldn't need this extra offset | |
| 1041 int MAJOR_HACK_OFFSET = 8; | |
| 1042 // System.out.println(" SPARCFrame.isSignalHandlerFrameDbg: I2 = " + i2 + ", fp = " + fp + ", youngerSP = " + youngerSP); | |
| 1043 return VM.getVM().getAddressSize() * (REGISTER_SAVE_WORDS + MAJOR_HACK_OFFSET); | |
| 1044 } | |
| 1045 | |
| 1046 public long getMContextAreaOffsetInUContext() { | |
| 1047 // From dbx-related sources: | |
| 1048 // /* | |
| 1049 // * struct sigframe is declaredf in the kernel sources in | |
| 1050 // * .../uts/sun4c/os/machdep.c/sendsig() | |
| 1051 // * unfortunately we only get a pointer to the 'uc' passed | |
| 1052 // * to the sighandler so we need to do this stuff to get | |
| 1053 // * to 'rwin'. | |
| 1054 // * Have to do it like this to take account of alignment. | |
| 1055 // */ | |
| 1056 // static struct sigframe { | |
| 1057 // struct rwindow rwin; | |
| 1058 // ucontext_t uc; | |
| 1059 // } sf_help; | |
| 1060 | |
| 1061 // From /usr/include/sys/ucontext.h: | |
| 1062 // #if !defined(_XPG4_2) || defined(__EXTENSIONS__) | |
| 1063 // struct ucontext { | |
| 1064 // #else | |
| 1065 // struct __ucontext { | |
| 1066 // #endif | |
| 1067 // uint_t uc_flags; | |
| 1068 // ucontext_t *uc_link; | |
| 1069 // sigset_t uc_sigmask; | |
| 1070 // stack_t uc_stack; | |
| 1071 // mcontext_t uc_mcontext; | |
| 1072 // #ifdef __sparcv9 | |
| 1073 // long uc_filler[4]; | |
| 1074 // #else /* __sparcv9 */ | |
| 1075 // long uc_filler[23]; | |
| 1076 // #endif /* __sparcv9 */ | |
| 1077 // }; | |
| 1078 | |
| 1079 // This walks to the start of the gregs in the mcontext_t | |
| 1080 // (first entry in that data structure). Really should read | |
| 1081 // this from header file. | |
| 1082 | |
| 1083 // Also not sure exactly how alignment works...maybe should read these offsets from the target VM | |
| 1084 // (When you have a hammer, everything looks like a nail) | |
| 1085 long offset = VM.getVM().alignUp(4, VM.getVM().getAddressSize()); // uc_flags | |
| 1086 offset = VM.getVM().alignUp(offset + VM.getVM().getAddressSize(), 8); // uc_link plus | |
| 1087 // doubleword alignment for structs? | |
| 1088 offset += 16 + // uc_sigmask | |
| 1089 2 * VM.getVM().getAddressSize() + 4; // uc_stack | |
| 1090 offset = VM.getVM().alignUp(offset + VM.getVM().getAddressSize(), 8); // doubleword alignment for structs? | |
| 1091 | |
| 1092 // System.out.println("SPARCFrame.getMContextAreaOffsetInUContext: offset = " + offset); | |
| 1093 | |
| 1094 return offset; | |
| 1095 } | |
| 1096 } |