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src/os_cpu/linux_x86/vm/thread_linux_x86.hpp@899ecf76b570 (annotated)

src/os_cpu/linux_x86/vm/thread_linux_x86.hpp

Wed, 25 Sep 2013 13:58:13 +0200

author

dsimms

date

Wed, 25 Sep 2013 13:58:13 +0200

changeset 5781

899ecf76b570

parent 5237

f2110083203d

child 6876

710a3c8b516e

child 8877

f04097176542

permissions

-rw-r--r--

8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
Summary: Execute some code at a high virtual address value, and keep mapped
Reviewed-by: coleenp, zgu

duke@435	1	/*
sla@5237	2	* Copyright (c) 2000, 2013, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef OS_CPU_LINUX_X86_VM_THREAD_LINUX_X86_HPP
stefank@2314	26	#define OS_CPU_LINUX_X86_VM_THREAD_LINUX_X86_HPP
stefank@2314	27
duke@435	28	private:
duke@435	29	void pd_initialize() {
duke@435	30	_anchor.clear();
duke@435	31	}
duke@435	32
duke@435	33	frame pd_last_frame() {
duke@435	34	assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
duke@435	35	if (_anchor.last_Java_pc() != NULL) {
duke@435	36	return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc());
duke@435	37	} else {
duke@435	38	// This will pick up pc from sp
duke@435	39	return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp());
duke@435	40	}
duke@435	41	}
duke@435	42
duke@435	43	public:
duke@435	44	// Mutators are highly dangerous....
duke@435	45	intptr_t* last_Java_fp() { return _anchor.last_Java_fp(); }
duke@435	46	void set_last_Java_fp(intptr_t* fp) { _anchor.set_last_Java_fp(fp); }
duke@435	47
duke@435	48	void set_base_of_stack_pointer(intptr_t* base_sp) {
duke@435	49	}
duke@435	50
duke@435	51	static ByteSize last_Java_fp_offset() {
duke@435	52	return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_fp_offset();
duke@435	53	}
duke@435	54
duke@435	55	intptr_t* base_of_stack_pointer() {
duke@435	56	return NULL;
duke@435	57	}
duke@435	58	void record_base_of_stack_pointer() {
duke@435	59	}
duke@435	60
duke@435	61	bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext,
duke@435	62	bool isInJava);
duke@435	63
sla@5237	64	bool pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava);
sla@5237	65	private:
sla@5237	66	bool pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava);
sla@5237	67	public:
sla@5237	68
duke@435	69	// These routines are only used on cpu architectures that
duke@435	70	// have separate register stacks (Itanium).
duke@435	71	static bool register_stack_overflow() { return false; }
duke@435	72	static void enable_register_stack_guard() {}
duke@435	73	static void disable_register_stack_guard() {}
stefank@2314	74
stefank@2314	75	#endif // OS_CPU_LINUX_X86_VM_THREAD_LINUX_X86_HPP