Thu, 16 Feb 2012 17:12:49 -0800
7145346: VerifyStackAtCalls is broken
Summary: Replace call_epilog() encoding with macroassembler use. Moved duplicated code to x86.ad. Fixed return_addr() definition.
Reviewed-by: never
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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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).
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15 * You should have received a copy of the GNU General Public License version
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #include "precompiled.hpp"
26 #include "asm/assembler.hpp"
27 #include "assembler_x86.inline.hpp"
28 #include "runtime/os.hpp"
29 #include "runtime/threadLocalStorage.hpp"
32 void MacroAssembler::int3() {
33 emit_byte(0xCC);
34 }
36 #ifndef _LP64
37 // The current scheme to accelerate access to the thread
38 // pointer is to store the current thread in the os_exception_wrapper
39 // and reference the current thread from stubs and compiled code
40 // via the FS register. FS[0] contains a pointer to the structured
41 // exception block which is actually a stack address. The first time
42 // we call the os exception wrapper, we calculate and store the
43 // offset from this exception block and use that offset here.
44 //
45 // The last mechanism we used was problematic in that the
46 // the offset we had hard coded in the VM kept changing as Microsoft
47 // evolved the OS.
48 //
49 // Warning: This mechanism assumes that we only attempt to get the
50 // thread when we are nested below a call wrapper.
51 //
52 // movl reg, fs:[0] Get exeception pointer
53 // movl reg, [reg + thread_ptr_offset] Load thread
54 //
55 void MacroAssembler::get_thread(Register thread) {
56 // can't use ExternalAddress because it can't take NULL
57 AddressLiteral null(0, relocInfo::none);
59 prefix(FS_segment);
60 movptr(thread, null);
61 assert(ThreadLocalStorage::get_thread_ptr_offset() != 0,
62 "Thread Pointer Offset has not been initialized");
63 movl(thread, Address(thread, ThreadLocalStorage::get_thread_ptr_offset()));
64 }
65 #else
66 // call (Thread*)TlsGetValue(thread_index());
67 void MacroAssembler::get_thread(Register thread) {
68 if (thread != rax) {
69 push(rax);
70 }
71 push(rdi);
72 push(rsi);
73 push(rdx);
74 push(rcx);
75 push(r8);
76 push(r9);
77 push(r10);
78 // XXX
79 mov(r10, rsp);
80 andq(rsp, -16);
81 push(r10);
82 push(r11);
84 movl(c_rarg0, ThreadLocalStorage::thread_index());
85 call(RuntimeAddress((address)TlsGetValue));
87 pop(r11);
88 pop(rsp);
89 pop(r10);
90 pop(r9);
91 pop(r8);
92 pop(rcx);
93 pop(rdx);
94 pop(rsi);
95 pop(rdi);
96 if (thread != rax) {
97 mov(thread, rax);
98 pop(rax);
99 }
100 }
101 #endif