1 /* 2 * Copyright (c) 1998, 2019, 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_THREAD_LINUX_SPARC_HPP 26 #define OS_CPU_LINUX_SPARC_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 37 // Sometimes the trap handler needs to record both PC and NPC. 38 // This is a SPARC-specific companion to Thread::set_saved_exception_pc. 39 address _saved_exception_npc; 40 41 // In polling_page_safepoint_handler_blob(s) we have to tail call other 42 // blobs without blowing any registers. A tail call requires some 43 // register to jump with and we can't blow any registers, so it must 44 // be restored in the delay slot. 'restore' cannot be used as it 45 // will chop the heads off of 64-bit %o registers in the 32-bit 46 // build. Instead we reload the registers using G2_thread and this 47 // location. Must be 64bits in the 32-bit LION build. 48 jdouble _o_reg_temps[6]; 49 50 // a stack pointer older than any java frame stack pointer. It is 51 // used to validate stack pointers in frame::next_younger_sp (it 52 // provides the upper bound in the range check). This is necessary 53 // on Solaris/SPARC since the ucontext passed to a signal handler is 54 // sometimes corrupt and we need a way to check the extracted sp. 55 intptr_t* _base_of_stack_pointer; 56 57 public: 58 59 static int o_reg_temps_offset_in_bytes() { return offset_of(JavaThread, _o_reg_temps); } 60 61 #ifndef _LP64 62 address o_reg_temps(int i) { return (address)&_o_reg_temps[i]; } 63 #endif 64 65 static ByteSize saved_exception_npc_offset() { return byte_offset_of(JavaThread,_saved_exception_npc); } 66 67 address saved_exception_npc() { return _saved_exception_npc; } 68 void set_saved_exception_npc(address a) { _saved_exception_npc = a; } 69 70 71 public: 72 73 intptr_t* base_of_stack_pointer() { return _base_of_stack_pointer; } 74 75 void set_base_of_stack_pointer(intptr_t* base_sp) { 76 _base_of_stack_pointer = base_sp; 77 } 78 79 void record_base_of_stack_pointer() { 80 intptr_t *sp = (intptr_t *)(((intptr_t)StubRoutines::Sparc::flush_callers_register_windows_func()())); 81 intptr_t *ysp; 82 while((ysp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]) != NULL) { 83 sp = (intptr_t *)((intptr_t)ysp + STACK_BIAS); 84 } 85 _base_of_stack_pointer = sp; 86 } 87 88 bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava); 89 90 bool pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava); 91 92 // These routines are only used on cpu architectures that 93 // have separate register stacks (Itanium). 94 static bool register_stack_overflow() { return false; } 95 static void enable_register_stack_guard() {} 96 static void disable_register_stack_guard() {} 97 98 #endif // OS_CPU_LINUX_SPARC_THREAD_LINUX_SPARC_HPP