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1 /*
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2 * Copyright 1997-2007 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 // This file holds the platform specific parts of the StubRoutines
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26 // definition. See stubRoutines.hpp for a description on how to
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27 // extend it.
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28
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29
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30 // So unfortunately c2 will call with a pc from a frame object
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31 // (already adjusted) and a raw pc (unadjusted), so we need to check both.
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32 // It didn't use to be like this before adapter removal.
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33 static bool returns_to_call_stub(address return_pc) {
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34 return ((return_pc + frame::pc_return_offset) == _call_stub_return_address) ||
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35 (return_pc == _call_stub_return_address );
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36 }
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37
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38 enum /* platform_dependent_constants */ {
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39 // %%%%%%%% May be able to shrink this a lot
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40 code_size1 = 20000, // simply increase if too small (assembler will crash if too small)
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41 code_size2 = 20000 // simply increase if too small (assembler will crash if too small)
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42 };
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43
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44 class Sparc {
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45 friend class StubGenerator;
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46
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47 public:
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48 enum { nof_instance_allocators = 10 };
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49
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50 // allocator lock values
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51 enum {
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52 unlocked = 0,
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53 locked = 1
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54 };
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55
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56 enum {
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57 v8_oop_lock_ignore_bits = 2,
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58 v8_oop_lock_bits = 4,
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59 nof_v8_oop_lock_cache_entries = 1 << (v8_oop_lock_bits+v8_oop_lock_ignore_bits),
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60 v8_oop_lock_mask = right_n_bits(v8_oop_lock_bits),
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61 v8_oop_lock_mask_in_place = v8_oop_lock_mask << v8_oop_lock_ignore_bits
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62 };
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63
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64 static int _v8_oop_lock_cache[nof_v8_oop_lock_cache_entries];
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65
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66 private:
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67 static address _test_stop_entry;
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68 static address _stop_subroutine_entry;
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69 static address _flush_callers_register_windows_entry;
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70
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71 static int _atomic_memory_operation_lock;
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72
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73 static address _partial_subtype_check;
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74
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75 public:
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76 // %%% global lock for everyone who needs to use atomic_compare_and_exchange
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77 // %%% or atomic_increment -- should probably use more locks for more
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78 // %%% scalability-- for instance one for each eden space or group of
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79
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80 // address of the lock for atomic_compare_and_exchange
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81 static int* atomic_memory_operation_lock_addr() { return &_atomic_memory_operation_lock; }
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82
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83 // accessor and mutator for _atomic_memory_operation_lock
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84 static int atomic_memory_operation_lock() { return _atomic_memory_operation_lock; }
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85 static void set_atomic_memory_operation_lock(int value) { _atomic_memory_operation_lock = value; }
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86
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87 // test assembler stop routine by setting registers
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88 static void (*test_stop_entry()) () { return CAST_TO_FN_PTR(void (*)(void), _test_stop_entry); }
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89
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90 // a subroutine for debugging assembler code
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91 static address stop_subroutine_entry_address() { return (address)&_stop_subroutine_entry; }
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92
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93 // flushes (all but current) register window
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94 static intptr_t* (*flush_callers_register_windows_func())() { return CAST_TO_FN_PTR(intptr_t* (*)(void), _flush_callers_register_windows_entry); }
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95
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96 static address partial_subtype_check() { return _partial_subtype_check; }
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97 };
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