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1 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : * vim: set ts=8 sts=4 et sw=4 tw=99:
3 : * This Source Code Form is subject to the terms of the Mozilla Public
4 : * License, v. 2.0. If a copy of the MPL was not distributed with this
5 : * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 :
7 : #include "jsnativestack.h"
8 :
9 : #ifdef XP_WIN
10 : # include "jswin.h"
11 :
12 : #elif defined(XP_DARWIN) || defined(DARWIN) || defined(XP_UNIX)
13 : # include <pthread.h>
14 :
15 : # if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
16 : # include <pthread_np.h>
17 : # endif
18 :
19 : # if defined(ANDROID) && !defined(__aarch64__)
20 : # include <sys/types.h>
21 : # include <unistd.h>
22 : # endif
23 :
24 : #else
25 : # error "Unsupported platform"
26 :
27 : #endif
28 :
29 : #if defined(XP_WIN)
30 :
31 : void*
32 : js::GetNativeStackBaseImpl()
33 : {
34 : # if defined(_M_IX86) && defined(_MSC_VER)
35 : /*
36 : * offset 0x18 from the FS segment register gives a pointer to
37 : * the thread information block for the current thread
38 : */
39 : NT_TIB* pTib;
40 : __asm {
41 : MOV EAX, FS:[18h]
42 : MOV pTib, EAX
43 : }
44 : return static_cast<void*>(pTib->StackBase);
45 :
46 : # elif defined(_M_X64)
47 : PNT_TIB64 pTib = reinterpret_cast<PNT_TIB64>(NtCurrentTeb());
48 : return reinterpret_cast<void*>(pTib->StackBase);
49 :
50 : # elif defined(_M_ARM)
51 : PNT_TIB pTib = reinterpret_cast<PNT_TIB>(NtCurrentTeb());
52 : return static_cast<void*>(pTib->StackBase);
53 :
54 : # elif defined(_WIN32) && defined(__GNUC__)
55 : NT_TIB* pTib;
56 : asm ("movl %%fs:0x18, %0\n" : "=r" (pTib));
57 : return static_cast<void*>(pTib->StackBase);
58 :
59 : # endif
60 : }
61 :
62 : #elif defined(SOLARIS)
63 :
64 : #include <ucontext.h>
65 :
66 : JS_STATIC_ASSERT(JS_STACK_GROWTH_DIRECTION < 0);
67 :
68 : void*
69 : js::GetNativeStackBaseImpl()
70 : {
71 : stack_t st;
72 : stack_getbounds(&st);
73 : return static_cast<char*>(st.ss_sp) + st.ss_size;
74 : }
75 :
76 : #elif defined(AIX)
77 :
78 : #include <ucontext.h>
79 :
80 : JS_STATIC_ASSERT(JS_STACK_GROWTH_DIRECTION < 0);
81 :
82 : void*
83 : js::GetNativeStackBaseImpl()
84 : {
85 : ucontext_t context;
86 : getcontext(&context);
87 : return static_cast<char*>(context.uc_stack.ss_sp) +
88 : context.uc_stack.ss_size;
89 : }
90 :
91 : #else /* XP_UNIX */
92 :
93 : void*
94 40 : js::GetNativeStackBaseImpl()
95 : {
96 40 : pthread_t thread = pthread_self();
97 : # if defined(XP_DARWIN) || defined(DARWIN)
98 : return pthread_get_stackaddr_np(thread);
99 :
100 : # else
101 : pthread_attr_t sattr;
102 40 : pthread_attr_init(&sattr);
103 : # if defined(__OpenBSD__)
104 : stack_t ss;
105 : # elif defined(PTHREAD_NP_H) || defined(_PTHREAD_NP_H_) || defined(NETBSD)
106 : /* e.g. on FreeBSD 4.8 or newer, neundorf@kde.org */
107 : pthread_attr_get_np(thread, &sattr);
108 : # else
109 : /*
110 : * FIXME: this function is non-portable;
111 : * other POSIX systems may have different np alternatives
112 : */
113 40 : pthread_getattr_np(thread, &sattr);
114 : # endif
115 :
116 40 : void* stackBase = 0;
117 40 : size_t stackSize = 0;
118 : int rc;
119 : # if defined(__OpenBSD__)
120 : rc = pthread_stackseg_np(pthread_self(), &ss);
121 : stackBase = (void*)((size_t) ss.ss_sp - ss.ss_size);
122 : stackSize = ss.ss_size;
123 : # elif defined(ANDROID) && !defined(__aarch64__)
124 : if (gettid() == getpid()) {
125 : // bionic's pthread_attr_getstack prior to API 21 doesn't tell the truth
126 : // for the main thread (see bug 846670). So we scan /proc/self/maps to
127 : // find the segment which contains the stack.
128 : rc = -1;
129 :
130 : // Put the string on the stack, otherwise there is the danger that it
131 : // has not been decompressed by the the on-demand linker. Bug 1165460.
132 : //
133 : // The volatile keyword should stop the compiler from trying to omit
134 : // the stack copy in the future (hopefully).
135 : volatile char path[] = "/proc/self/maps";
136 : FILE* fs = fopen((const char*)path, "r");
137 :
138 : if (fs) {
139 : char line[100];
140 : unsigned long stackAddr = (unsigned long)&sattr;
141 : while (fgets(line, sizeof(line), fs) != nullptr) {
142 : unsigned long stackStart;
143 : unsigned long stackEnd;
144 : if (sscanf(line, "%lx-%lx ", &stackStart, &stackEnd) == 2 &&
145 : stackAddr >= stackStart && stackAddr < stackEnd) {
146 : stackBase = (void*)stackStart;
147 : stackSize = stackEnd - stackStart;
148 : rc = 0;
149 : break;
150 : }
151 : }
152 : fclose(fs);
153 : }
154 : } else
155 : // For non main-threads pthread allocates the stack itself so it tells
156 : // the truth.
157 : rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
158 : # else
159 40 : rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
160 : # endif
161 40 : if (rc)
162 0 : MOZ_CRASH();
163 40 : MOZ_ASSERT(stackBase);
164 40 : pthread_attr_destroy(&sattr);
165 :
166 : # if JS_STACK_GROWTH_DIRECTION > 0
167 : return stackBase;
168 : # else
169 40 : return static_cast<char*>(stackBase) + stackSize;
170 : # endif
171 : # endif
172 : }
173 :
174 : #endif /* !XP_WIN */
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