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src/os_cpu/solaris_sparc/vm/assembler_solaris_sparc.cpp@a61af66fc99e (annotated)

src/os_cpu/solaris_sparc/vm/assembler_solaris_sparc.cpp

Sat, 01 Dec 2007 00:00:00 +0000

author

duke

date

Sat, 01 Dec 2007 00:00:00 +0000

changeset 435

a61af66fc99e

child 672

1fdb98a17101

permissions

-rw-r--r--

Initial load

duke@435	1	/*
duke@435	2	* Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	#include "incls/_precompiled.incl"
duke@435	26	#include "incls/_assembler_solaris_sparc.cpp.incl"
duke@435	27
duke@435	28	#include <sys/trap.h> // For trap numbers
duke@435	29	#include <v9/sys/psr_compat.h> // For V8 compatibility
duke@435	30
duke@435	31	bool MacroAssembler::needs_explicit_null_check(intptr_t offset) {
duke@435	32	// The first page of virtual addresses is unmapped on SPARC.
duke@435	33	// Thus, any access the VM makes through a null pointer with an offset of
duke@435	34	// less than 4K will get a recognizable SIGSEGV, which the signal handler
duke@435	35	// will transform into a NullPointerException.
duke@435	36	// (Actually, the first 64K or so is unmapped, but it's simpler
duke@435	37	// to depend only on the first 4K or so.)
duke@435	38
duke@435	39	bool offset_in_first_page = 0 <= offset && offset < os::vm_page_size();
duke@435	40	return !offset_in_first_page;
duke@435	41	}
duke@435	42
duke@435	43	void MacroAssembler::read_ccr_trap(Register ccr_save) {
duke@435	44	// Execute a trap to get the PSR, mask and shift
duke@435	45	// to get the condition codes.
duke@435	46	get_psr_trap();
duke@435	47	nop();
duke@435	48	set(PSR_ICC, ccr_save);
duke@435	49	and3(O0, ccr_save, ccr_save);
duke@435	50	srl(ccr_save, PSR_ICC_SHIFT, ccr_save);
duke@435	51	}
duke@435	52
duke@435	53	void MacroAssembler::write_ccr_trap(Register ccr_save, Register scratch1, Register scratch2) {
duke@435	54	// Execute a trap to get the PSR, shift back
duke@435	55	// the condition codes, mask the condition codes
duke@435	56	// back into and PSR and trap to write back the
duke@435	57	// PSR.
duke@435	58	sll(ccr_save, PSR_ICC_SHIFT, scratch2);
duke@435	59	get_psr_trap();
duke@435	60	nop();
duke@435	61	set(~PSR_ICC, scratch1);
duke@435	62	and3(O0, scratch1, O0);
duke@435	63	or3(O0, scratch2, O0);
duke@435	64	set_psr_trap();
duke@435	65	nop();
duke@435	66	}
duke@435	67
duke@435	68	void MacroAssembler::flush_windows_trap() { trap(ST_FLUSH_WINDOWS); }
duke@435	69	void MacroAssembler::clean_windows_trap() { trap(ST_CLEAN_WINDOWS); }
duke@435	70	void MacroAssembler::get_psr_trap() { trap(ST_GETPSR); }
duke@435	71	void MacroAssembler::set_psr_trap() { trap(ST_SETPSR); }