1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 #include <stdint.h>
6 #include <stdlib.h>
7 #include <stdio.h>
8
9 #undef nil
10 #define nil ((void*)0)
11 #define nelem(x) (sizeof(x)/sizeof((x)[0]))
12
13 typedef uint32_t uint32;
14 typedef uint64_t uint64;
15 typedef uintptr_t uintptr;
16
17 /*
18 * The beginning of the per-goroutine structure,
19 * as defined in ../pkg/runtime/runtime.h.
20 * Just enough to edit these two fields.
21 */
22 typedef struct G G;
23 struct G
24 {
25 uintptr stacklo;
26 uintptr stackhi;
27 };
28
29 /*
30 * Arguments to the _cgo_thread_start call.
31 * Also known to ../pkg/runtime/runtime.h.
32 */
33 typedef struct ThreadStart ThreadStart;
34 struct ThreadStart
35 {
36 G *g;
37 uintptr *tls;
38 void (*fn)(void);
39 };
40
41 /*
42 * Called by 5c/6c/8c world.
43 * Makes a local copy of the ThreadStart and
44 * calls _cgo_sys_thread_start(ts).
45 */
46 extern void (*_cgo_thread_start)(ThreadStart *ts);
47
48 /*
49 * Creates a new operating system thread without updating any Go state
50 * (OS dependent).
51 */
52 extern void (*_cgo_sys_thread_create)(void* (*func)(void*), void* arg);
53
54 /*
55 * Indicates whether a dummy pthread per-thread variable is allocated.
56 */
57 extern uintptr_t *_cgo_pthread_key_created;
58
59 /*
60 * Creates the new operating system thread (OS, arch dependent).
61 */
62 void _cgo_sys_thread_start(ThreadStart *ts);
63
64 /*
65 * Waits for the Go runtime to be initialized (OS dependent).
66 * If runtime.SetCgoTraceback is used to set a context function,
67 * calls the context function and returns the context value.
68 */
69 uintptr_t _cgo_wait_runtime_init_done(void);
70
71 /*
72 * Get the low and high boundaries of the stack.
73 */
74 void x_cgo_getstackbound(uintptr bounds[2]);
75
76 /*
77 * Prints error then calls abort. For linux and android.
78 */
79 void fatalf(const char* format, ...) __attribute__ ((noreturn));
80
81 /*
82 * Registers the current mach thread port for EXC_BAD_ACCESS processing.
83 */
84 void darwin_arm_init_thread_exception_port(void);
85
86 /*
87 * Starts a mach message server processing EXC_BAD_ACCESS.
88 */
89 void darwin_arm_init_mach_exception_handler(void);
90
91 /*
92 * The cgo context function. See runtime.SetCgoTraceback.
93 */
94 struct context_arg {
95 uintptr_t Context;
96 };
97 extern void (*(_cgo_get_context_function(void)))(struct context_arg*);
98
99 /*
100 * The argument for the cgo traceback callback. See runtime.SetCgoTraceback.
101 */
102 struct cgoTracebackArg {
103 uintptr_t Context;
104 uintptr_t SigContext;
105 uintptr_t* Buf;
106 uintptr_t Max;
107 };
108
109 /*
110 * TSAN support. This is only useful when building with
111 * CGO_CFLAGS="-fsanitize=thread" CGO_LDFLAGS="-fsanitize=thread" go install
112 */
113 #undef CGO_TSAN
114 #if defined(__has_feature)
115 # if __has_feature(thread_sanitizer)
116 # define CGO_TSAN
117 # endif
118 #elif defined(__SANITIZE_THREAD__)
119 # define CGO_TSAN
120 #endif
121
122 #ifdef CGO_TSAN
123
124 // These must match the definitions in yesTsanProlog in cmd/cgo/out.go.
125 // In general we should call _cgo_tsan_acquire when we enter C code,
126 // and call _cgo_tsan_release when we return to Go code.
127 // This is only necessary when calling code that might be instrumented
128 // by TSAN, which mostly means system library calls that TSAN intercepts.
129 // See the comment in cmd/cgo/out.go for more details.
130
131 long long _cgo_sync __attribute__ ((common));
132
133 extern void __tsan_acquire(void*);
134 extern void __tsan_release(void*);
135
136 __attribute__ ((unused))
137 static void _cgo_tsan_acquire() {
138 __tsan_acquire(&_cgo_sync);
139 }
140
141 __attribute__ ((unused))
142 static void _cgo_tsan_release() {
143 __tsan_release(&_cgo_sync);
144 }
145
146 #else // !defined(CGO_TSAN)
147
148 #define _cgo_tsan_acquire()
149 #define _cgo_tsan_release()
150
151 #endif // !defined(CGO_TSAN)
152
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