1 /* 2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef OS_CPU_LINUX_SPARC_VM_THREAD_LINUX_SPARC_HPP 26 #define OS_CPU_LINUX_SPARC_VM_THREAD_LINUX_SPARC_HPP 27 28 private: 29 30 void pd_initialize() { 31 _anchor.clear(); 32 _base_of_stack_pointer = NULL; 33 } 34 35 frame pd_last_frame() { 36 assert(has_last_Java_frame(), "must have last_Java_sp() when suspended"); 37 assert(_anchor.walkable(), "thread has not dumped its register windows yet"); 38 39 assert(_anchor.last_Java_pc() != NULL, "Ack no pc!"); 40 return frame(last_Java_sp(), frame::unpatchable, _anchor.last_Java_pc()); 41 } 42 43 // Sometimes the trap handler needs to record both PC and NPC. 44 // This is a SPARC-specific companion to Thread::set_saved_exception_pc. 45 address _saved_exception_npc; 46 47 // In polling_page_safepoint_handler_blob(s) we have to tail call other 48 // blobs without blowing any registers. A tail call requires some 49 // register to jump with and we can't blow any registers, so it must 50 // be restored in the delay slot. 'restore' cannot be used as it 51 // will chop the heads off of 64-bit %o registers in the 32-bit 52 // build. Instead we reload the registers using G2_thread and this 53 // location. Must be 64bits in the 32-bit LION build. 54 jdouble _o_reg_temps[6]; 55 56 // a stack pointer older than any java frame stack pointer. It is 57 // used to validate stack pointers in frame::next_younger_sp (it 58 // provides the upper bound in the range check). This is necessary 59 // on Solaris/SPARC since the ucontext passed to a signal handler is 60 // sometimes corrupt and we need a way to check the extracted sp. 61 intptr_t* _base_of_stack_pointer; 62 63 public: 64 65 static int o_reg_temps_offset_in_bytes() { return offset_of(JavaThread, _o_reg_temps); } 66 67 #ifndef _LP64 68 address o_reg_temps(int i) { return (address)&_o_reg_temps[i]; } 69 #endif 70 71 static int saved_exception_npc_offset_in_bytes() { return offset_of(JavaThread,_saved_exception_npc); } 72 73 address saved_exception_npc() { return _saved_exception_npc; } 74 void set_saved_exception_npc(address a) { _saved_exception_npc = a; } 75 76 77 public: 78 79 intptr_t* base_of_stack_pointer() { return _base_of_stack_pointer; } 80 81 void set_base_of_stack_pointer(intptr_t* base_sp) { 82 _base_of_stack_pointer = base_sp; 83 } 84 85 void record_base_of_stack_pointer() { 86 intptr_t *sp = (intptr_t *)(((intptr_t)StubRoutines::Sparc::flush_callers_register_windows_func()())); 87 intptr_t *ysp; 88 while((ysp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]) != NULL) { 89 sp = (intptr_t *)((intptr_t)ysp + STACK_BIAS); 90 } 91 _base_of_stack_pointer = sp; 92 } 93 94 bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, 95 bool isInJava); 96 97 // These routines are only used on cpu architectures that 98 // have separate register stacks (Itanium). 99 static bool register_stack_overflow() { return false; } 100 static void enable_register_stack_guard() {} 101 static void disable_register_stack_guard() {} 102 103 #endif // OS_CPU_LINUX_SPARC_VM_THREAD_LINUX_SPARC_HPP