1 /*
2 * Copyright (c) 2008, 2018, 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 *
40 #include "vmreg_arm.inline.hpp"
41 #ifdef COMPILER1
42 #include "c1/c1_Runtime1.hpp"
43 #include "runtime/vframeArray.hpp"
44 #endif
45 #include "prims/methodHandles.hpp"
46
47 #ifdef ASSERT
48 void RegisterMap::check_location_valid() {
49 }
50 #endif
51
52
53 // Profiling/safepoint support
54
55 bool frame::safe_for_sender(JavaThread *thread) {
56 address sp = (address)_sp;
57 address fp = (address)_fp;
58 address unextended_sp = (address)_unextended_sp;
59
60 static size_t stack_guard_size = os::uses_stack_guard_pages() ?
61 (JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_zone_size()) : 0;
62 size_t usable_stack_size = thread->stack_size() - stack_guard_size;
63
64 // sp must be within the usable part of the stack (not in guards)
65 bool sp_safe = (sp != NULL &&
66 (sp <= thread->stack_base()) &&
67 (sp >= thread->stack_base() - usable_stack_size));
68
69 if (!sp_safe) {
70 return false;
71 }
72
73 bool unextended_sp_safe = (unextended_sp != NULL &&
74 (unextended_sp <= thread->stack_base()) &&
75 (unextended_sp >= sp));
76 if (!unextended_sp_safe) {
77 return false;
78 }
79
80 // We know sp/unextended_sp are safe. Only fp is questionable here.
81
82 bool fp_safe = (fp != NULL &&
83 (fp <= thread->stack_base()) &&
84 fp >= sp);
85
86 if (_cb != NULL ) {
87
88 // First check if frame is complete and tester is reliable
89 // Unfortunately we can only check frame complete for runtime stubs and nmethod
90 // other generic buffer blobs are more problematic so we just assume they are
91 // ok. adapter blobs never have a frame complete and are never ok.
92
93 if (!_cb->is_frame_complete_at(_pc)) {
94 if (_cb->is_compiled() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
95 return false;
96 }
97 }
98
99 // Could just be some random pointer within the codeBlob
100 if (!_cb->code_contains(_pc)) {
101 return false;
102 }
103
131 // With our calling conventions, the return_address should
132 // end up being the word on the stack
133 sender_pc = (address) *(sender_sp - sender_sp_offset + return_addr_offset);
134 }
135
136 // We must always be able to find a recognizable pc
137 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
138 if (sender_pc == NULL || sender_blob == NULL) {
139 return false;
140 }
141
142
143 // If the potential sender is the interpreter then we can do some more checking
144 if (Interpreter::contains(sender_pc)) {
145
146 // FP is always saved in a recognizable place in any code we generate. However
147 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved FP
148 // is really a frame pointer.
149
150 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset + link_offset);
151 bool saved_fp_safe = ((address)saved_fp <= thread->stack_base()) && (saved_fp > sender_sp);
152
153 if (!saved_fp_safe) {
154 return false;
155 }
156
157 // construct the potential sender
158
159 frame sender(sender_sp, saved_fp, sender_pc);
160
161 return sender.is_interpreted_frame_valid(thread);
162 }
163
164 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
165 return false;
166 }
167
168 // Could just be some random pointer within the codeBlob
169 if (!sender_blob->code_contains(sender_pc)) {
170 return false;
171 }
172
173 // We should never be able to see an adapter if the current frame is something from code cache
174 if (sender_blob->is_adapter_blob()) {
175 return false;
176 }
177
178 // Could be the call_stub
179 if (StubRoutines::returns_to_call_stub(sender_pc)) {
180 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset + link_offset);
181 bool saved_fp_safe = ((address)saved_fp <= thread->stack_base()) && (saved_fp >= sender_sp);
182
183 if (!saved_fp_safe) {
184 return false;
185 }
186
187 // construct the potential sender
188
189 frame sender(sender_sp, saved_fp, sender_pc);
190
191 // Validate the JavaCallWrapper an entry frame must have
192 address jcw = (address)sender.entry_frame_call_wrapper();
193
194 bool jcw_safe = (jcw <= thread->stack_base()) && (jcw > (address)sender.fp());
195
196 return jcw_safe;
197 }
198
199 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
200 // because the return address counts against the callee's frame.
201
202 if (sender_blob->frame_size() <= 0) {
203 assert(!sender_blob->is_compiled(), "should count return address at least");
204 return false;
205 }
206
207 // We should never be able to see anything here except an nmethod. If something in the
208 // code cache (current frame) is called by an entity within the code cache that entity
209 // should not be anything but the call stub (already covered), the interpreter (already covered)
210 // or an nmethod.
211
212 if (!sender_blob->is_compiled()) {
213 return false;
214 }
484
485 if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
486 return false;
487 }
488
489 // validate bci/bcp
490
491 address bcp = interpreter_frame_bcp();
492 if (m->validate_bci_from_bcp(bcp) < 0) {
493 return false;
494 }
495
496 // validate ConstantPoolCache*
497 ConstantPoolCache* cp = *interpreter_frame_cache_addr();
498 if (MetaspaceObj::is_valid(cp) == false) return false;
499
500 // validate locals
501
502 address locals = (address) *interpreter_frame_locals_addr();
503
504 if (locals > thread->stack_base() || locals < (address) fp()) return false;
505
506 // We'd have to be pretty unlucky to be mislead at this point
507
508 return true;
509 }
510
511 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
512 assert(is_interpreted_frame(), "interpreted frame expected");
513 Method* method = interpreter_frame_method();
514 BasicType type = method->result_type();
515
516 intptr_t* res_addr;
517 if (method->is_native()) {
518 // Prior to calling into the runtime to report the method_exit both of
519 // the possible return value registers are saved.
520 // Return value registers are pushed to the native stack
521 res_addr = (intptr_t*)sp();
522 #ifdef __ABI_HARD__
523 // FP result is pushed onto a stack along with integer result registers
524 if (type == T_FLOAT || type == T_DOUBLE) {
|
1 /*
2 * Copyright (c) 2008, 2020, 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 *
40 #include "vmreg_arm.inline.hpp"
41 #ifdef COMPILER1
42 #include "c1/c1_Runtime1.hpp"
43 #include "runtime/vframeArray.hpp"
44 #endif
45 #include "prims/methodHandles.hpp"
46
47 #ifdef ASSERT
48 void RegisterMap::check_location_valid() {
49 }
50 #endif
51
52
53 // Profiling/safepoint support
54
55 bool frame::safe_for_sender(JavaThread *thread) {
56 address sp = (address)_sp;
57 address fp = (address)_fp;
58 address unextended_sp = (address)_unextended_sp;
59
60 // consider stack guards when trying to determine "safe" stack pointers
61 // sp must be within the usable part of the stack (not in guards)
62 if (!thread->is_in_usable_stack(sp)) {
63 return false;
64 }
65
66 bool unextended_sp_safe = (unextended_sp != NULL &&
67 (unextended_sp < thread->stack_base()) &&
68 (unextended_sp >= sp));
69 if (!unextended_sp_safe) {
70 return false;
71 }
72
73 // We know sp/unextended_sp are safe. Only fp is questionable here.
74
75 bool fp_safe = (fp != NULL &&
76 (fp < thread->stack_base()) &&
77 fp >= sp);
78
79 if (_cb != NULL ) {
80
81 // First check if frame is complete and tester is reliable
82 // Unfortunately we can only check frame complete for runtime stubs and nmethod
83 // other generic buffer blobs are more problematic so we just assume they are
84 // ok. adapter blobs never have a frame complete and are never ok.
85
86 if (!_cb->is_frame_complete_at(_pc)) {
87 if (_cb->is_compiled() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
88 return false;
89 }
90 }
91
92 // Could just be some random pointer within the codeBlob
93 if (!_cb->code_contains(_pc)) {
94 return false;
95 }
96
124 // With our calling conventions, the return_address should
125 // end up being the word on the stack
126 sender_pc = (address) *(sender_sp - sender_sp_offset + return_addr_offset);
127 }
128
129 // We must always be able to find a recognizable pc
130 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
131 if (sender_pc == NULL || sender_blob == NULL) {
132 return false;
133 }
134
135
136 // If the potential sender is the interpreter then we can do some more checking
137 if (Interpreter::contains(sender_pc)) {
138
139 // FP is always saved in a recognizable place in any code we generate. However
140 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved FP
141 // is really a frame pointer.
142
143 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset + link_offset);
144 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
145
146 if (!saved_fp_safe) {
147 return false;
148 }
149
150 // construct the potential sender
151
152 frame sender(sender_sp, saved_fp, sender_pc);
153
154 return sender.is_interpreted_frame_valid(thread);
155 }
156
157 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
158 return false;
159 }
160
161 // Could just be some random pointer within the codeBlob
162 if (!sender_blob->code_contains(sender_pc)) {
163 return false;
164 }
165
166 // We should never be able to see an adapter if the current frame is something from code cache
167 if (sender_blob->is_adapter_blob()) {
168 return false;
169 }
170
171 // Could be the call_stub
172 if (StubRoutines::returns_to_call_stub(sender_pc)) {
173 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset + link_offset);
174 bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp >= sender_sp);
175
176 if (!saved_fp_safe) {
177 return false;
178 }
179
180 // construct the potential sender
181
182 frame sender(sender_sp, saved_fp, sender_pc);
183
184 // Validate the JavaCallWrapper an entry frame must have
185 address jcw = (address)sender.entry_frame_call_wrapper();
186
187 bool jcw_safe = (jcw < thread->stack_base()) && (jcw > (address)sender.fp());
188
189 return jcw_safe;
190 }
191
192 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
193 // because the return address counts against the callee's frame.
194
195 if (sender_blob->frame_size() <= 0) {
196 assert(!sender_blob->is_compiled(), "should count return address at least");
197 return false;
198 }
199
200 // We should never be able to see anything here except an nmethod. If something in the
201 // code cache (current frame) is called by an entity within the code cache that entity
202 // should not be anything but the call stub (already covered), the interpreter (already covered)
203 // or an nmethod.
204
205 if (!sender_blob->is_compiled()) {
206 return false;
207 }
477
478 if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
479 return false;
480 }
481
482 // validate bci/bcp
483
484 address bcp = interpreter_frame_bcp();
485 if (m->validate_bci_from_bcp(bcp) < 0) {
486 return false;
487 }
488
489 // validate ConstantPoolCache*
490 ConstantPoolCache* cp = *interpreter_frame_cache_addr();
491 if (MetaspaceObj::is_valid(cp) == false) return false;
492
493 // validate locals
494
495 address locals = (address) *interpreter_frame_locals_addr();
496
497 if (locals >= thread->stack_base() || locals < (address) fp()) return false;
498
499 // We'd have to be pretty unlucky to be mislead at this point
500
501 return true;
502 }
503
504 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
505 assert(is_interpreted_frame(), "interpreted frame expected");
506 Method* method = interpreter_frame_method();
507 BasicType type = method->result_type();
508
509 intptr_t* res_addr;
510 if (method->is_native()) {
511 // Prior to calling into the runtime to report the method_exit both of
512 // the possible return value registers are saved.
513 // Return value registers are pushed to the native stack
514 res_addr = (intptr_t*)sp();
515 #ifdef __ABI_HARD__
516 // FP result is pushed onto a stack along with integer result registers
517 if (type == T_FLOAT || type == T_DOUBLE) {
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