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1 /*
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2 * Copyright 1998-2008 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 private:
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26
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27 void pd_initialize() {
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28 _anchor.clear();
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29 _base_of_stack_pointer = NULL;
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30 }
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31
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32 frame pd_last_frame() {
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33 assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
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34 assert(_anchor.walkable(), "thread has not dumped its register windows yet");
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35
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36 assert(_anchor.last_Java_pc() != NULL, "Ack no pc!");
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37 return frame(last_Java_sp(), frame::unpatchable, _anchor.last_Java_pc());
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38 }
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39
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40 // Sometimes the trap handler needs to record both PC and NPC.
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41 // This is a SPARC-specific companion to Thread::set_saved_exception_pc.
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42 address _saved_exception_npc;
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43
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44 // In polling_page_safepoint_handler_blob(s) we have to tail call other
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45 // blobs without blowing any registers. A tail call requires some
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46 // register to jump with and we can't blow any registers, so it must
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47 // be restored in the delay slot. 'restore' cannot be used as it
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48 // will chop the heads off of 64-bit %o registers in the 32-bit
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49 // build. Instead we reload the registers using G2_thread and this
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50 // location. Must be 64bits in the 32-bit LION build.
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51 jdouble _o_reg_temps[6];
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52
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53 // a stack pointer older than any java frame stack pointer. It is
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54 // used to validate stack pointers in frame::next_younger_sp (it
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55 // provides the upper bound in the range check). This is necessary
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56 // on Solaris/SPARC since the ucontext passed to a signal handler is
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57 // sometimes corrupt and we need a way to check the extracted sp.
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58 intptr_t* _base_of_stack_pointer;
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59
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60 public:
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61
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62 static int o_reg_temps_offset_in_bytes() { return offset_of(JavaThread, _o_reg_temps); }
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63
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64 #ifndef _LP64
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65 address o_reg_temps(int i) { return (address)&_o_reg_temps[i]; }
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66 #endif
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67
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68 static int saved_exception_npc_offset_in_bytes() { return offset_of(JavaThread,_saved_exception_npc); }
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69
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70 address saved_exception_npc() { return _saved_exception_npc; }
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71 void set_saved_exception_npc(address a) { _saved_exception_npc = a; }
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72
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73
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74 public:
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75
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76 intptr_t* base_of_stack_pointer() { return _base_of_stack_pointer; }
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77
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78 void set_base_of_stack_pointer(intptr_t* base_sp) {
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79 _base_of_stack_pointer = base_sp;
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80 }
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81
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82 void record_base_of_stack_pointer() {
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83 intptr_t *sp = (intptr_t *)(((intptr_t)StubRoutines::Sparc::flush_callers_register_windows_func()()));
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84 intptr_t *ysp;
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85 while((ysp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]) != NULL) {
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86 sp = (intptr_t *)((intptr_t)ysp + STACK_BIAS);
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87 }
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88 _base_of_stack_pointer = sp;
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89 }
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90
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91 bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext,
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92 bool isInJava);
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93
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94 // These routines are only used on cpu architectures that
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95 // have separate register stacks (Itanium).
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96 static bool register_stack_overflow() { return false; }
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97 static void enable_register_stack_guard() {}
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98 static void disable_register_stack_guard() {}
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