]>
Commit | Line | Data |
---|---|---|
b667dd70 | 1 | //===-- sanitizer_stoptheworld_mac.cpp ------------------------------------===// |
5d3805fc | 2 | // |
b667dd70 ML |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. | |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |
5d3805fc JJ |
6 | // |
7 | //===----------------------------------------------------------------------===// | |
8 | // | |
9 | // See sanitizer_stoptheworld.h for details. | |
10 | // | |
11 | //===----------------------------------------------------------------------===// | |
12 | ||
13 | #include "sanitizer_platform.h" | |
14 | ||
15 | #if SANITIZER_MAC && (defined(__x86_64__) || defined(__aarch64__) || \ | |
16 | defined(__i386)) | |
17 | ||
18 | #include <mach/mach.h> | |
19 | #include <mach/thread_info.h> | |
20 | #include <pthread.h> | |
21 | ||
22 | #include "sanitizer_stoptheworld.h" | |
23 | ||
24 | namespace __sanitizer { | |
25 | typedef struct { | |
26 | tid_t tid; | |
27 | thread_t thread; | |
28 | } SuspendedThreadInfo; | |
29 | ||
30 | class SuspendedThreadsListMac : public SuspendedThreadsList { | |
31 | public: | |
32 | SuspendedThreadsListMac() : threads_(1024) {} | |
33 | ||
34 | tid_t GetThreadID(uptr index) const; | |
35 | thread_t GetThread(uptr index) const; | |
36 | uptr ThreadCount() const; | |
37 | bool ContainsThread(thread_t thread) const; | |
38 | void Append(thread_t thread); | |
39 | ||
40 | PtraceRegistersStatus GetRegistersAndSP(uptr index, uptr *buffer, | |
41 | uptr *sp) const; | |
42 | uptr RegisterCount() const; | |
43 | ||
44 | private: | |
45 | InternalMmapVector<SuspendedThreadInfo> threads_; | |
46 | }; | |
47 | ||
48 | struct RunThreadArgs { | |
49 | StopTheWorldCallback callback; | |
50 | void *argument; | |
51 | }; | |
52 | ||
3c6331c2 | 53 | void *RunThread(void *arg) { |
5d3805fc JJ |
54 | struct RunThreadArgs *run_args = (struct RunThreadArgs *)arg; |
55 | SuspendedThreadsListMac suspended_threads_list; | |
56 | ||
57 | thread_array_t threads; | |
58 | mach_msg_type_number_t num_threads; | |
59 | kern_return_t err = task_threads(mach_task_self(), &threads, &num_threads); | |
60 | if (err != KERN_SUCCESS) { | |
61 | VReport(1, "Failed to get threads for task (errno %d).\n", err); | |
3c6331c2 | 62 | return nullptr; |
5d3805fc JJ |
63 | } |
64 | ||
65 | thread_t thread_self = mach_thread_self(); | |
66 | for (unsigned int i = 0; i < num_threads; ++i) { | |
67 | if (threads[i] == thread_self) continue; | |
68 | ||
69 | thread_suspend(threads[i]); | |
70 | suspended_threads_list.Append(threads[i]); | |
71 | } | |
72 | ||
73 | run_args->callback(suspended_threads_list, run_args->argument); | |
74 | ||
75 | uptr num_suspended = suspended_threads_list.ThreadCount(); | |
76 | for (unsigned int i = 0; i < num_suspended; ++i) { | |
77 | thread_resume(suspended_threads_list.GetThread(i)); | |
78 | } | |
3c6331c2 | 79 | return nullptr; |
5d3805fc JJ |
80 | } |
81 | ||
82 | void StopTheWorld(StopTheWorldCallback callback, void *argument) { | |
83 | struct RunThreadArgs arg = {callback, argument}; | |
84 | pthread_t run_thread = (pthread_t)internal_start_thread(RunThread, &arg); | |
85 | internal_join_thread(run_thread); | |
86 | } | |
87 | ||
88 | #if defined(__x86_64__) | |
89 | typedef x86_thread_state64_t regs_struct; | |
90 | ||
91 | #define SP_REG __rsp | |
92 | ||
93 | #elif defined(__aarch64__) | |
94 | typedef arm_thread_state64_t regs_struct; | |
95 | ||
96 | # if __DARWIN_UNIX03 | |
97 | # define SP_REG __sp | |
98 | # else | |
99 | # define SP_REG sp | |
100 | # endif | |
101 | ||
102 | #elif defined(__i386) | |
103 | typedef x86_thread_state32_t regs_struct; | |
104 | ||
105 | #define SP_REG __esp | |
106 | ||
107 | #else | |
108 | #error "Unsupported architecture" | |
109 | #endif | |
110 | ||
111 | tid_t SuspendedThreadsListMac::GetThreadID(uptr index) const { | |
112 | CHECK_LT(index, threads_.size()); | |
113 | return threads_[index].tid; | |
114 | } | |
115 | ||
116 | thread_t SuspendedThreadsListMac::GetThread(uptr index) const { | |
117 | CHECK_LT(index, threads_.size()); | |
118 | return threads_[index].thread; | |
119 | } | |
120 | ||
121 | uptr SuspendedThreadsListMac::ThreadCount() const { | |
122 | return threads_.size(); | |
123 | } | |
124 | ||
125 | bool SuspendedThreadsListMac::ContainsThread(thread_t thread) const { | |
126 | for (uptr i = 0; i < threads_.size(); i++) { | |
127 | if (threads_[i].thread == thread) return true; | |
128 | } | |
129 | return false; | |
130 | } | |
131 | ||
132 | void SuspendedThreadsListMac::Append(thread_t thread) { | |
133 | thread_identifier_info_data_t info; | |
134 | mach_msg_type_number_t info_count = THREAD_IDENTIFIER_INFO_COUNT; | |
135 | kern_return_t err = thread_info(thread, THREAD_IDENTIFIER_INFO, | |
136 | (thread_info_t)&info, &info_count); | |
137 | if (err != KERN_SUCCESS) { | |
138 | VReport(1, "Error - unable to get thread ident for a thread\n"); | |
139 | return; | |
140 | } | |
141 | threads_.push_back({info.thread_id, thread}); | |
142 | } | |
143 | ||
144 | PtraceRegistersStatus SuspendedThreadsListMac::GetRegistersAndSP( | |
145 | uptr index, uptr *buffer, uptr *sp) const { | |
146 | thread_t thread = GetThread(index); | |
147 | regs_struct regs; | |
148 | int err; | |
149 | mach_msg_type_number_t reg_count = MACHINE_THREAD_STATE_COUNT; | |
150 | err = thread_get_state(thread, MACHINE_THREAD_STATE, (thread_state_t)®s, | |
151 | ®_count); | |
152 | if (err != KERN_SUCCESS) { | |
153 | VReport(1, "Error - unable to get registers for a thread\n"); | |
154 | // KERN_INVALID_ARGUMENT indicates that either the flavor is invalid, | |
155 | // or the thread does not exist. The other possible error case, | |
156 | // MIG_ARRAY_TOO_LARGE, means that the state is too large, but it's | |
157 | // still safe to proceed. | |
158 | return err == KERN_INVALID_ARGUMENT ? REGISTERS_UNAVAILABLE_FATAL | |
159 | : REGISTERS_UNAVAILABLE; | |
160 | } | |
161 | ||
162 | internal_memcpy(buffer, ®s, sizeof(regs)); | |
3c6331c2 ML |
163 | #if defined(__aarch64__) && defined(arm_thread_state64_get_sp) |
164 | *sp = arm_thread_state64_get_sp(regs); | |
165 | #else | |
5d3805fc | 166 | *sp = regs.SP_REG; |
3c6331c2 | 167 | #endif |
5d3805fc JJ |
168 | |
169 | // On x86_64 and aarch64, we must account for the stack redzone, which is 128 | |
170 | // bytes. | |
171 | if (SANITIZER_WORDSIZE == 64) *sp -= 128; | |
172 | ||
173 | return REGISTERS_AVAILABLE; | |
174 | } | |
175 | ||
176 | uptr SuspendedThreadsListMac::RegisterCount() const { | |
177 | return MACHINE_THREAD_STATE_COUNT; | |
178 | } | |
179 | } // namespace __sanitizer | |
180 | ||
181 | #endif // SANITIZER_MAC && (defined(__x86_64__) || defined(__aarch64__)) || | |
182 | // defined(__i386)) |