32 #include "runtime/frame.inline.hpp"
33 #include "runtime/handles.inline.hpp"
34 #include "runtime/javaCalls.hpp"
35 #include "runtime/monitorChunk.hpp"
36 #include "runtime/signature.hpp"
37 #include "runtime/stubCodeGenerator.hpp"
38 #include "runtime/stubRoutines.hpp"
39 #include "vmreg_ppc.inline.hpp"
40 #ifdef COMPILER1
41 #include "c1/c1_Runtime1.hpp"
42 #include "runtime/vframeArray.hpp"
43 #endif
44
45 #ifdef ASSERT
46 void RegisterMap::check_location_valid() {
47 }
48 #endif // ASSERT
49
50 bool frame::safe_for_sender(JavaThread *thread) {
51 bool safe = false;
52 address cursp = (address)sp();
53 address curfp = (address)fp();
54 if ((cursp != NULL && curfp != NULL &&
55 (cursp <= thread->stack_base() && cursp >= thread->stack_base() - thread->stack_size())) &&
56 (curfp <= thread->stack_base() && curfp >= thread->stack_base() - thread->stack_size())) {
57 safe = true;
58 }
59 return safe;
60 }
61
62 bool frame::is_interpreted_frame() const {
63 return Interpreter::contains(pc());
64 }
65
66 frame frame::sender_for_entry_frame(RegisterMap *map) const {
67 assert(map != NULL, "map must be set");
68 // Java frame called from C; skip all C frames and return top C
69 // frame of that chunk as the sender.
70 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
71 assert(!entry_frame_is_first(), "next Java fp must be non zero");
72 assert(jfa->last_Java_sp() > _sp, "must be above this frame on stack");
73 map->clear();
74 assert(map->include_argument_oops(), "should be set by clear");
75
76 if (jfa->last_Java_pc() != NULL) {
77 frame fr(jfa->last_Java_sp(), jfa->last_Java_pc());
78 return fr;
79 }
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32 #include "runtime/frame.inline.hpp"
33 #include "runtime/handles.inline.hpp"
34 #include "runtime/javaCalls.hpp"
35 #include "runtime/monitorChunk.hpp"
36 #include "runtime/signature.hpp"
37 #include "runtime/stubCodeGenerator.hpp"
38 #include "runtime/stubRoutines.hpp"
39 #include "vmreg_ppc.inline.hpp"
40 #ifdef COMPILER1
41 #include "c1/c1_Runtime1.hpp"
42 #include "runtime/vframeArray.hpp"
43 #endif
44
45 #ifdef ASSERT
46 void RegisterMap::check_location_valid() {
47 }
48 #endif // ASSERT
49
50 bool frame::safe_for_sender(JavaThread *thread) {
51 bool safe = false;
52 address sp = (address)_sp;
53 address fp = (address)_fp;
54 address unextended_sp = (address)_unextended_sp;
55
56 // Consider stack guards when trying to determine "safe" stack pointers
57 static size_t stack_guard_size = os::uses_stack_guard_pages() ?
58 thread->stack_red_zone_size() + thread->stack_yellow_zone_size() : 0;
59 size_t usable_stack_size = thread->stack_size() - stack_guard_size;
60
61 // sp must be within the usable part of the stack (not in guards)
62 bool sp_safe = (sp < thread->stack_base()) &&
63 (sp >= thread->stack_base() - usable_stack_size);
64
65
66 if (!sp_safe) {
67 return false;
68 }
69
70 // Unextended sp must be within the stack and above or equal sp
71 bool unextended_sp_safe = (unextended_sp < thread->stack_base()) && (unextended_sp >= sp);
72
73 if (!unextended_sp_safe) {
74 return false;
75 }
76
77 // An fp must be within the stack and above (but not equal) sp.
78 bool fp_safe = (fp <= thread->stack_base()) && (fp > sp);
79 // an interpreter fp must be within the stack and above (but not equal) sp
80 bool fp_interp_safe = (fp <= thread->stack_base()) && (fp > sp) &&
81 ((fp - sp) >= (ijava_state_size + top_ijava_frame_abi_size));
82
83 // We know sp/unextended_sp are safe, only fp is questionable here
84
85 // If the current frame is known to the code cache then we can attempt to
86 // to construct the sender and do some validation of it. This goes a long way
87 // toward eliminating issues when we get in frame construction code
88
89 if (_cb != NULL ){
90 // Entry frame checks
91 if (is_entry_frame()) {
92 // An entry frame must have a valid fp.
93 return fp_safe && is_entry_frame_valid(thread);
94 }
95
96 // Now check if the frame is complete and the test is
97 // reliable. Unfortunately we can only check frame completeness for
98 // runtime stubs and nmethods. Other generic buffer blobs are more
99 // problematic so we just assume they are OK. Adapter blobs never have a
100 // complete frame and are never OK
101 if (!_cb->is_frame_complete_at(_pc)) {
102 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
103 return false;
104 }
105 }
106
107 // Could just be some random pointer within the codeBlob.
108 if (!_cb->code_contains(_pc)) {
109 return false;
110 }
111
112 if (is_interpreted_frame() && !fp_interp_safe) {
113 return false;
114 }
115
116 abi_minframe* sender_abi = (abi_minframe*) fp;
117 intptr_t* sender_sp = (intptr_t*) fp;
118 address sender_pc = (address) sender_abi->lr;;
119
120 // We must always be able to find a recognizable pc.
121 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
122 if (sender_blob == NULL) {
123 return false;
124 }
125
126 // Could be a zombie method
127 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
128 return false;
129 }
130
131 // It should be safe to construct the sender though it might not be valid.
132
133 frame sender(sender_sp, sender_pc);
134
135 // Do we have a valid fp?
136 address sender_fp = (address) sender.fp();
137
138 // sender_fp must be within the stack and above (but not
139 // equal) current frame's fp.
140 if (sender_fp > thread->stack_base() || sender_fp <= fp) {
141 return false;
142 }
143
144 // If the potential sender is the interpreter then we can do some more checking.
145 if (Interpreter::contains(sender_pc)) {
146 return sender.is_interpreted_frame_valid(thread);
147 }
148
149 // Could just be some random pointer within the codeBlob.
150 if (!sender.cb()->code_contains(sender_pc)) {
151 return false;
152 }
153
154 // We should never be able to see an adapter if the current frame is something from code cache.
155 if (sender_blob->is_adapter_blob()) {
156 return false;
157 }
158
159 if (sender.is_entry_frame()) {
160 return sender.is_entry_frame_valid(thread);
161 }
162
163 // Frame size is always greater than zero. If the sender frame size is zero or less,
164 // something is really weird and we better give up.
165 if (sender_blob->frame_size() <= 0) {
166 return false;
167 }
168
169 return true;
170 }
171
172 // Must be native-compiled frame. Since sender will try and use fp to find
173 // linkages it must be safe
174
175 if (!fp_safe) {
176 return false;
177 }
178
179 return true;
180 }
181
182 bool frame::is_interpreted_frame() const {
183 return Interpreter::contains(pc());
184 }
185
186 frame frame::sender_for_entry_frame(RegisterMap *map) const {
187 assert(map != NULL, "map must be set");
188 // Java frame called from C; skip all C frames and return top C
189 // frame of that chunk as the sender.
190 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
191 assert(!entry_frame_is_first(), "next Java fp must be non zero");
192 assert(jfa->last_Java_sp() > _sp, "must be above this frame on stack");
193 map->clear();
194 assert(map->include_argument_oops(), "should be set by clear");
195
196 if (jfa->last_Java_pc() != NULL) {
197 frame fr(jfa->last_Java_sp(), jfa->last_Java_pc());
198 return fr;
199 }
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