Text file
src/runtime/cgo/gcc_darwin_arm64.c
1// Copyright 2014 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 <limits.h>
6#include <pthread.h>
7#include <signal.h>
8#include <string.h> /* for strerror */
9#include <sys/param.h>
10#include <unistd.h>
11#include <stdlib.h>
12
13#include "libcgo.h"
14#include "libcgo_unix.h"
15
16#include <TargetConditionals.h>
17
18#if TARGET_OS_IPHONE
19#include <CoreFoundation/CFBundle.h>
20#include <CoreFoundation/CFString.h>
21#endif
22
23static void *threadentry(void*);
24static void (*setg_gcc)(void*);
25
26void
27_cgo_sys_thread_start(ThreadStart *ts)
28{
29 pthread_attr_t attr;
30 sigset_t ign, oset;
31 pthread_t p;
32 size_t size;
33 int err;
34
35 //fprintf(stderr, "runtime/cgo: _cgo_sys_thread_start: fn=%p, g=%p\n", ts->fn, ts->g); // debug
36 sigfillset(&ign);
37 pthread_sigmask(SIG_SETMASK, &ign, &oset);
38
39 size = pthread_get_stacksize_np(pthread_self());
40 pthread_attr_init(&attr);
41 pthread_attr_setstacksize(&attr, size);
42 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
43 // Leave stacklo=0 and set stackhi=size; mstart will do the rest.
44 ts->g->stackhi = size;
45 err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
46
47 pthread_sigmask(SIG_SETMASK, &oset, nil);
48
49 if (err != 0) {
50 fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
51 abort();
52 }
53}
54
55extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
56static void*
57threadentry(void *v)
58{
59 ThreadStart ts;
60
61 ts = *(ThreadStart*)v;
62 free(v);
63
64#if TARGET_OS_IPHONE
65 darwin_arm_init_thread_exception_port();
66#endif
67
68 crosscall1(ts.fn, setg_gcc, (void*)ts.g);
69 return nil;
70}
71
72#if TARGET_OS_IPHONE
73
74// init_working_dir sets the current working directory to the app root.
75// By default ios/arm64 processes start in "/".
76static void
77init_working_dir()
78{
79 CFBundleRef bundle;
80 CFURLRef url_ref;
81 CFStringRef url_str_ref;
82 char buf[MAXPATHLEN];
83 Boolean res;
84 int url_len;
85 char *dir;
86 CFStringRef wd_ref;
87
88 bundle = CFBundleGetMainBundle();
89 if (bundle == NULL) {
90 fprintf(stderr, "runtime/cgo: no main bundle\n");
91 return;
92 }
93 url_ref = CFBundleCopyResourceURL(bundle, CFSTR("Info"), CFSTR("plist"), NULL);
94 if (url_ref == NULL) {
95 // No Info.plist found. It can happen on Corellium virtual devices.
96 return;
97 }
98 url_str_ref = CFURLGetString(url_ref);
99 res = CFStringGetCString(url_str_ref, buf, sizeof(buf), kCFStringEncodingUTF8);
100 CFRelease(url_ref);
101 if (!res) {
102 fprintf(stderr, "runtime/cgo: cannot get URL string\n");
103 return;
104 }
105
106 // url is of the form "file:///path/to/Info.plist".
107 // strip it down to the working directory "/path/to".
108 url_len = strlen(buf);
109 if (url_len < sizeof("file://")+sizeof("/Info.plist")) {
110 fprintf(stderr, "runtime/cgo: bad URL: %s\n", buf);
111 return;
112 }
113 buf[url_len-sizeof("/Info.plist")+1] = 0;
114 dir = &buf[0] + sizeof("file://")-1;
115
116 if (chdir(dir) != 0) {
117 fprintf(stderr, "runtime/cgo: chdir(%s) failed\n", dir);
118 }
119
120 // The test harness in go_ios_exec passes the relative working directory
121 // in the GoExecWrapperWorkingDirectory property of the app bundle.
122 wd_ref = CFBundleGetValueForInfoDictionaryKey(bundle, CFSTR("GoExecWrapperWorkingDirectory"));
123 if (wd_ref != NULL) {
124 if (!CFStringGetCString(wd_ref, buf, sizeof(buf), kCFStringEncodingUTF8)) {
125 fprintf(stderr, "runtime/cgo: cannot get GoExecWrapperWorkingDirectory string\n");
126 return;
127 }
128 if (chdir(buf) != 0) {
129 fprintf(stderr, "runtime/cgo: chdir(%s) failed\n", buf);
130 }
131 }
132}
133
134#endif // TARGET_OS_IPHONE
135
136void
137x_cgo_init(G *g, void (*setg)(void*))
138{
139 //fprintf(stderr, "x_cgo_init = %p\n", &x_cgo_init); // aid debugging in presence of ASLR
140 setg_gcc = setg;
141 _cgo_set_stacklo(g, NULL);
142
143#if TARGET_OS_IPHONE
144 darwin_arm_init_mach_exception_handler();
145 darwin_arm_init_thread_exception_port();
146 init_working_dir();
147#endif
148}
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