thread_linux_sparc.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1998, 2008, 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 25private: 26 27 void pd_initialize() { 28 _anchor.clear(); 29 _base_of_stack_pointer = NULL; 30 } 31 32 frame pd_last_frame() { 33 assert(has_last_Java_frame(), "must have last_Java_sp() when suspended"); 34 assert(_anchor.walkable(), "thread has not dumped its register windows yet"); 35 36 assert(_anchor.last_Java_pc() != NULL, "Ack no pc!"); 37 return frame(last_Java_sp(), frame::unpatchable, _anchor.last_Java_pc()); 38 } 39 40 // Sometimes the trap handler needs to record both PC and NPC. 41 // This is a SPARC-specific companion to Thread::set_saved_exception_pc. 42 address _saved_exception_npc; 43 44 // In polling_page_safepoint_handler_blob(s) we have to tail call other 45 // blobs without blowing any registers. A tail call requires some 46 // register to jump with and we can't blow any registers, so it must 47 // be restored in the delay slot. 'restore' cannot be used as it 48 // will chop the heads off of 64-bit %o registers in the 32-bit 49 // build. Instead we reload the registers using G2_thread and this 50 // location. Must be 64bits in the 32-bit LION build. 51 jdouble _o_reg_temps[6]; 52 53 // a stack pointer older than any java frame stack pointer. It is 54 // used to validate stack pointers in frame::next_younger_sp (it 55 // provides the upper bound in the range check). This is necessary 56 // on Solaris/SPARC since the ucontext passed to a signal handler is 57 // sometimes corrupt and we need a way to check the extracted sp. 58 intptr_t* _base_of_stack_pointer; 59 60public: 61 62 static int o_reg_temps_offset_in_bytes() { return offset_of(JavaThread, _o_reg_temps); } 63 64#ifndef _LP64 65 address o_reg_temps(int i) { return (address)&_o_reg_temps[i]; } 66#endif 67 68 static int saved_exception_npc_offset_in_bytes() { return offset_of(JavaThread,_saved_exception_npc); } 69 70 address saved_exception_npc() { return _saved_exception_npc; } 71 void set_saved_exception_npc(address a) { _saved_exception_npc = a; } 72 73 74public: 75 76 intptr_t* base_of_stack_pointer() { return _base_of_stack_pointer; } 77 78 void set_base_of_stack_pointer(intptr_t* base_sp) { 79 _base_of_stack_pointer = base_sp; 80 } 81 82 void record_base_of_stack_pointer() { 83 intptr_t *sp = (intptr_t *)(((intptr_t)StubRoutines::Sparc::flush_callers_register_windows_func()())); 84 intptr_t *ysp; 85 while((ysp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]) != NULL) { 86 sp = (intptr_t *)((intptr_t)ysp + STACK_BIAS); 87 } 88 _base_of_stack_pointer = sp; 89 } 90 91 bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, 92 bool isInJava); 93 94 // These routines are only used on cpu architectures that 95 // have separate register stacks (Itanium). 96 static bool register_stack_overflow() { return false; } 97 static void enable_register_stack_guard() {} 98 static void disable_register_stack_guard() {} 99