1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : * vim: set ts=4 sw=4 et tw=99:
3 : *
4 : * ***** BEGIN LICENSE BLOCK *****
5 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6 : *
7 : * The contents of this file are subject to the Mozilla Public License Version
8 : * 1.1 (the "License"); you may not use this file except in compliance with
9 : * the License. You may obtain a copy of the License at
10 : * http://www.mozilla.org/MPL/
11 : *
12 : * Software distributed under the License is distributed on an "AS IS" basis,
13 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14 : * for the specific language governing rights and limitations under the
15 : * License.
16 : *
17 : * The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
18 : * May 28, 2008.
19 : *
20 : * The Initial Developer of the Original Code is
21 : * Mozilla Foundation
22 : * Portions created by the Initial Developer are Copyright (C) 2011
23 : * the Initial Developer. All Rights Reserved.
24 : *
25 : * Contributor(s):
26 : *
27 : * Alternatively, the contents of this file may be used under the terms of
28 : * either of the GNU General Public License Version 2 or later (the "GPL"),
29 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
30 : * in which case the provisions of the GPL or the LGPL are applicable instead
31 : * of those above. If you wish to allow use of your version of this file only
32 : * under the terms of either the GPL or the LGPL, and not to allow others to
33 : * use your version of this file under the terms of the MPL, indicate your
34 : * decision by deleting the provisions above and replace them with the notice
35 : * and other provisions required by the GPL or the LGPL. If you do not delete
36 : * the provisions above, a recipient may use your version of this file under
37 : * the terms of any one of the MPL, the GPL or the LGPL.
38 : *
39 : * ***** END LICENSE BLOCK ***** */
40 :
41 : #include "jsapi.h"
42 : #include "jscntxt.h"
43 : #include "jscrashreport.h"
44 : #include "jscrashformat.h"
45 :
46 : #include <time.h>
47 :
48 : namespace js {
49 : namespace crash {
50 :
51 : const static int stack_snapshot_max_size = 32768;
52 :
53 : #if defined(XP_WIN)
54 :
55 : #include <windows.h>
56 :
57 : static bool
58 : GetStack(uint64_t *stack, uint64_t *stack_len, CrashRegisters *regs, char *buffer, size_t size)
59 : {
60 : /* Try to figure out how big the stack is. */
61 : char dummy;
62 : MEMORY_BASIC_INFORMATION info;
63 : if (VirtualQuery(reinterpret_cast<LPCVOID>(&dummy), &info, sizeof(info)) == 0)
64 : return false;
65 : if (info.State != MEM_COMMIT)
66 : return false;
67 :
68 : /* 256 is a fudge factor to account for the rest of GetStack's frame. */
69 : uint64_t p = uint64_t(&dummy) - 256;
70 : uint64_t len = stack_snapshot_max_size;
71 :
72 : if (p + len > uint64_t(info.BaseAddress) + info.RegionSize)
73 : len = uint64_t(info.BaseAddress) + info.RegionSize - p;
74 :
75 : if (len > size)
76 : len = size;
77 :
78 : *stack = p;
79 : *stack_len = len;
80 :
81 : /* Get the register state. */
82 : #if defined(_MSC_VER) && JS_BITS_PER_WORD == 32
83 : /* ASM version for win2k that doesn't support RtlCaptureContext */
84 : uint32_t vip, vsp, vbp;
85 : __asm {
86 : Label:
87 : mov [vbp], ebp;
88 : mov [vsp], esp;
89 : mov eax, [Label];
90 : mov [vip], eax;
91 : }
92 : regs->ip = vip;
93 : regs->sp = vsp;
94 : regs->bp = vbp;
95 : #else
96 : CONTEXT context;
97 : RtlCaptureContext(&context);
98 : #if JS_BITS_PER_WORD == 32
99 : regs->ip = context.Eip;
100 : regs->sp = context.Esp;
101 : regs->bp = context.Ebp;
102 : #else
103 : regs->ip = context.Rip;
104 : regs->sp = context.Rsp;
105 : regs->bp = context.Rbp;
106 : #endif
107 : #endif
108 :
109 : js_memcpy(buffer, (void *)p, len);
110 :
111 : return true;
112 : }
113 :
114 : #elif 0
115 :
116 : #include <unistd.h>
117 : #include <ucontext.h>
118 : #include <sys/mman.h>
119 :
120 : static bool
121 : GetStack(uint64_t *stack, uint64_t *stack_len, CrashRegisters *regs, char *buffer, size_t size)
122 : {
123 : /* 256 is a fudge factor to account for the rest of GetStack's frame. */
124 : char dummy;
125 : uint64_t p = uint64_t(&dummy) - 256;
126 : uint64_t pgsz = getpagesize();
127 : uint64_t len = stack_snapshot_max_size;
128 : p &= ~(pgsz - 1);
129 :
130 : /* Try to figure out how big the stack is. */
131 : while (len > 0) {
132 : if (mlock((const void *)p, len) == 0) {
133 : munlock((const void *)p, len);
134 : break;
135 : }
136 : len -= pgsz;
137 : }
138 :
139 : if (len > size)
140 : len = size;
141 :
142 : *stack = p;
143 : *stack_len = len;
144 :
145 : /* Get the register state. */
146 : ucontext_t context;
147 : if (getcontext(&context) != 0)
148 : return false;
149 :
150 : #if JS_BITS_PER_WORD == 64
151 : regs->sp = (uint64_t)context.uc_mcontext.gregs[REG_RSP];
152 : regs->bp = (uint64_t)context.uc_mcontext.gregs[REG_RBP];
153 : regs->ip = (uint64_t)context.uc_mcontext.gregs[REG_RIP];
154 : #elif JS_BITS_PER_WORD == 32
155 : regs->sp = (uint64_t)context.uc_mcontext.gregs[REG_ESP];
156 : regs->bp = (uint64_t)context.uc_mcontext.gregs[REG_EBP];
157 : regs->ip = (uint64_t)context.uc_mcontext.gregs[REG_EIP];
158 : #endif
159 :
160 : js_memcpy(buffer, (void *)p, len);
161 :
162 : return true;
163 : }
164 :
165 : #else
166 :
167 : static bool
168 14736 : GetStack(uint64_t *stack, uint64_t *stack_len, CrashRegisters *regs, char *buffer, size_t size)
169 : {
170 14736 : return false;
171 : }
172 :
173 : #endif
174 :
175 : class Stack : private CrashStack
176 : {
177 : public:
178 : Stack(uint64_t id);
179 :
180 : bool snapshot();
181 : };
182 :
183 39740 : Stack::Stack(uint64_t id)
184 39740 : : CrashStack(id)
185 : {
186 39740 : }
187 :
188 : bool
189 14736 : Stack::snapshot()
190 : {
191 14736 : snaptime = time(NULL);
192 14736 : return GetStack(&stack_base, &stack_len, ®s, stack, sizeof(stack));
193 : }
194 :
195 : class Ring : private CrashRing
196 : {
197 : public:
198 : Ring(uint64_t id);
199 :
200 : void push(uint64_t tag, void *data, size_t size);
201 :
202 : private:
203 0 : size_t bufferSize() { return crash_buffer_size; }
204 : void copyBytes(void *data, size_t size);
205 : };
206 :
207 19870 : Ring::Ring(uint64_t id)
208 19870 : : CrashRing(id)
209 : {
210 19870 : }
211 :
212 : void
213 0 : Ring::push(uint64_t tag, void *data, size_t size)
214 : {
215 0 : uint64_t t = time(NULL);
216 :
217 0 : copyBytes(&tag, sizeof(uint64_t));
218 0 : copyBytes(&t, sizeof(uint64_t));
219 0 : copyBytes(data, size);
220 0 : uint64_t mysize = size;
221 0 : copyBytes(&mysize, sizeof(uint64_t));
222 0 : }
223 :
224 : void
225 0 : Ring::copyBytes(void *data, size_t size)
226 : {
227 0 : if (size >= bufferSize())
228 0 : size = bufferSize();
229 :
230 0 : if (offset + size > bufferSize()) {
231 0 : size_t first = bufferSize() - offset;
232 0 : size_t second = size - first;
233 0 : js_memcpy(&buffer[offset], data, first);
234 0 : js_memcpy(buffer, (char *)data + first, second);
235 0 : offset = second;
236 : } else {
237 0 : js_memcpy(&buffer[offset], data, size);
238 0 : offset += size;
239 : }
240 0 : }
241 :
242 : static bool gInitialized;
243 :
244 19870 : static Stack gGCStack(JS_CRASH_STACK_GC);
245 19870 : static Stack gErrorStack(JS_CRASH_STACK_ERROR);
246 19870 : static Ring gRingBuffer(JS_CRASH_RING);
247 :
248 : void
249 51092 : SnapshotGCStack()
250 : {
251 51092 : if (gInitialized)
252 14736 : gGCStack.snapshot();
253 51092 : }
254 :
255 : void
256 0 : SnapshotErrorStack()
257 : {
258 0 : if (gInitialized)
259 0 : gErrorStack.snapshot();
260 0 : }
261 :
262 : void
263 0 : SaveCrashData(uint64_t tag, void *ptr, size_t size)
264 : {
265 0 : if (gInitialized)
266 0 : gRingBuffer.push(tag, ptr, size);
267 0 : }
268 :
269 : } /* namespace crash */
270 : } /* namespace js */
271 :
272 : using namespace js;
273 : using namespace js::crash;
274 :
275 : JS_PUBLIC_API(void)
276 1404 : JS_EnumerateDiagnosticMemoryRegions(JSEnumerateDiagnosticMemoryCallback callback)
277 : {
278 : #ifdef JS_CRASH_DIAGNOSTICS
279 1404 : if (!gInitialized) {
280 1404 : gInitialized = true;
281 1404 : (*callback)(&gGCStack, sizeof(gGCStack));
282 1404 : (*callback)(&gErrorStack, sizeof(gErrorStack));
283 1404 : (*callback)(&gRingBuffer, sizeof(gRingBuffer));
284 : }
285 : #endif
286 61014 : }
287 :
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