From fa6b5a8027b86d2f8a200e72b4ef6a0d3f9189d3 Mon Sep 17 00:00:00 2001 From: duke Date: Sat, 1 Dec 2007 00:00:00 +0000 Subject: Initial load --- src/cpu/x86/vm/runtime_x86_32.cpp | 150 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 150 insertions(+) create mode 100644 src/cpu/x86/vm/runtime_x86_32.cpp (limited to 'src/cpu/x86/vm/runtime_x86_32.cpp') diff --git a/src/cpu/x86/vm/runtime_x86_32.cpp b/src/cpu/x86/vm/runtime_x86_32.cpp new file mode 100644 index 000000000..d8d190936 --- /dev/null +++ b/src/cpu/x86/vm/runtime_x86_32.cpp @@ -0,0 +1,150 @@ +/* + * Copyright 1998-2006 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + + +#include "incls/_precompiled.incl" +#include "incls/_runtime_x86_32.cpp.incl" + +#define __ masm-> + +ExceptionBlob* OptoRuntime::_exception_blob; + +//------------------------------generate_exception_blob--------------------------- +// creates exception blob at the end +// Using exception blob, this code is jumped from a compiled method. +// +// Given an exception pc at a call we call into the runtime for the +// handler in this method. This handler might merely restore state +// (i.e. callee save registers) unwind the frame and jump to the +// exception handler for the nmethod if there is no Java level handler +// for the nmethod. +// +// This code is entered with a jmp. +// +// Arguments: +// rax,: exception oop +// rdx: exception pc +// +// Results: +// rax,: exception oop +// rdx: exception pc in caller or ??? +// destination: exception handler of caller +// +// Note: the exception pc MUST be at a call (precise debug information) +// Only register rax, rdx, rcx are not callee saved. +// + +void OptoRuntime::generate_exception_blob() { + + // Capture info about frame layout + enum layout { + thread_off, // last_java_sp + // The frame sender code expects that rbp will be in the "natural" place and + // will override any oopMap setting for it. We must therefore force the layout + // so that it agrees with the frame sender code. + rbp_off, + return_off, // slot for return address + framesize + }; + + // allocate space for the code + ResourceMark rm; + // setup code generation tools + CodeBuffer buffer("exception_blob", 512, 512); + MacroAssembler* masm = new MacroAssembler(&buffer); + + OopMapSet *oop_maps = new OopMapSet(); + + address start = __ pc(); + + __ pushl(rdx); + __ subl(rsp, return_off * wordSize); // Prolog! + + // rbp, location is implicitly known + __ movl(Address(rsp,rbp_off *wordSize),rbp); + + // Store exception in Thread object. We cannot pass any arguments to the + // handle_exception call, since we do not want to make any assumption + // about the size of the frame where the exception happened in. + __ get_thread(rcx); + __ movl(Address(rcx, JavaThread::exception_oop_offset()), rax); + __ movl(Address(rcx, JavaThread::exception_pc_offset()), rdx); + + // This call does all the hard work. It checks if an exception handler + // exists in the method. + // If so, it returns the handler address. + // If not, it prepares for stack-unwinding, restoring the callee-save + // registers of the frame being removed. + // + __ movl(Address(rsp, thread_off * wordSize), rcx); // Thread is first argument + __ set_last_Java_frame(rcx, noreg, noreg, NULL); + + __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C))); + + // No registers to map, rbp is known implicitly + oop_maps->add_gc_map( __ pc() - start, new OopMap( framesize, 0 )); + __ get_thread(rcx); + __ reset_last_Java_frame(rcx, false, false); + + // Restore callee-saved registers + __ movl(rbp, Address(rsp, rbp_off * wordSize)); + + __ addl(rsp, return_off * wordSize); // Epilog! + __ popl(rdx); // Exception pc + + + // rax,: exception handler for given + + // We have a handler in rax, (could be deopt blob) + // rdx - throwing pc, deopt blob will need it. + + __ pushl(rax); + + // rcx contains handler address + + __ get_thread(rcx); // TLS + // Get the exception + __ movl(rax, Address(rcx, JavaThread::exception_oop_offset())); + // Get the exception pc in case we are deoptimized + __ movl(rdx, Address(rcx, JavaThread::exception_pc_offset())); +#ifdef ASSERT + __ movl(Address(rcx, JavaThread::exception_handler_pc_offset()), 0); + __ movl(Address(rcx, JavaThread::exception_pc_offset()), 0); +#endif + // Clear the exception oop so GC no longer processes it as a root. + __ movl(Address(rcx, JavaThread::exception_oop_offset()), 0); + + __ popl(rcx); + + // rax,: exception oop + // rcx: exception handler + // rdx: exception pc + __ jmp (rcx); + + // ------------- + // make sure all code is generated + masm->flush(); + + _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize); +} -- cgit v1.2.3