Dan Willemsen | 38f2dba | 2016-07-08 14:54:35 -0700 | [diff] [blame] | 1 | // Copyright 2014 The Go Authors. All rights reserved. |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 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 | |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 12 | #include <CoreFoundation/CFBundle.h> |
| 13 | #include <CoreFoundation/CFString.h> |
| 14 | |
Dan Willemsen | c741332 | 2018-08-27 23:21:26 -0700 | [diff] [blame] | 15 | #include "libcgo.h" |
| 16 | #include "libcgo_unix.h" |
| 17 | |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 18 | #define magic (0xe696c4f4U) |
| 19 | |
| 20 | // inittls allocates a thread-local storage slot for g. |
| 21 | // |
| 22 | // It finds the first available slot using pthread_key_create and uses |
| 23 | // it as the offset value for runtime.tlsg. |
| 24 | static void |
| 25 | inittls(void **tlsg, void **tlsbase) |
| 26 | { |
| 27 | pthread_key_t k; |
| 28 | int i, err; |
| 29 | |
| 30 | err = pthread_key_create(&k, nil); |
| 31 | if(err != 0) { |
| 32 | fprintf(stderr, "runtime/cgo: pthread_key_create failed: %d\n", err); |
| 33 | abort(); |
| 34 | } |
| 35 | //fprintf(stderr, "runtime/cgo: k = %d, tlsbase = %p\n", (int)k, tlsbase); // debug |
| 36 | pthread_setspecific(k, (void*)magic); |
| 37 | // The first key should be at 258. |
| 38 | for (i=0; i<PTHREAD_KEYS_MAX; i++) { |
| 39 | if (*(tlsbase+i) == (void*)magic) { |
| 40 | *tlsg = (void*)(i*sizeof(void *)); |
| 41 | pthread_setspecific(k, 0); |
| 42 | return; |
| 43 | } |
| 44 | } |
| 45 | fprintf(stderr, "runtime/cgo: could not find pthread key.\n"); |
| 46 | abort(); |
| 47 | } |
| 48 | |
| 49 | static void *threadentry(void*); |
Colin Cross | 430342c | 2019-09-07 08:36:04 -0700 | [diff] [blame] | 50 | static void (*setg_gcc)(void*); |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 51 | |
| 52 | void |
| 53 | _cgo_sys_thread_start(ThreadStart *ts) |
| 54 | { |
| 55 | pthread_attr_t attr; |
| 56 | sigset_t ign, oset; |
| 57 | pthread_t p; |
| 58 | size_t size; |
| 59 | int err; |
| 60 | |
| 61 | sigfillset(&ign); |
| 62 | pthread_sigmask(SIG_SETMASK, &ign, &oset); |
| 63 | |
| 64 | pthread_attr_init(&attr); |
| 65 | size = 0; |
| 66 | pthread_attr_getstacksize(&attr, &size); |
Dan Willemsen | d279748 | 2017-07-26 13:13:13 -0700 | [diff] [blame] | 67 | // Leave stacklo=0 and set stackhi=size; mstart will do the rest. |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 68 | ts->g->stackhi = size; |
Dan Willemsen | ebae302 | 2017-01-13 23:01:08 -0800 | [diff] [blame] | 69 | err = _cgo_try_pthread_create(&p, &attr, threadentry, ts); |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 70 | |
| 71 | pthread_sigmask(SIG_SETMASK, &oset, nil); |
| 72 | |
| 73 | if (err != 0) { |
| 74 | fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err)); |
| 75 | abort(); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | extern void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void*), void *g); |
| 80 | static void* |
| 81 | threadentry(void *v) |
| 82 | { |
| 83 | ThreadStart ts; |
| 84 | |
| 85 | ts = *(ThreadStart*)v; |
| 86 | free(v); |
| 87 | |
| 88 | darwin_arm_init_thread_exception_port(); |
| 89 | |
| 90 | crosscall_arm1(ts.fn, setg_gcc, (void*)ts.g); |
| 91 | return nil; |
| 92 | } |
| 93 | |
| 94 | // init_working_dir sets the current working directory to the app root. |
| 95 | // By default darwin/arm processes start in "/". |
| 96 | static void |
| 97 | init_working_dir() |
| 98 | { |
| 99 | CFBundleRef bundle = CFBundleGetMainBundle(); |
| 100 | if (bundle == NULL) { |
| 101 | fprintf(stderr, "runtime/cgo: no main bundle\n"); |
| 102 | return; |
| 103 | } |
| 104 | CFURLRef url_ref = CFBundleCopyResourceURL(bundle, CFSTR("Info"), CFSTR("plist"), NULL); |
| 105 | if (url_ref == NULL) { |
Colin Cross | 430342c | 2019-09-07 08:36:04 -0700 | [diff] [blame] | 106 | // No Info.plist found. It can happen on Corellium virtual devices. |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 107 | return; |
| 108 | } |
| 109 | CFStringRef url_str_ref = CFURLGetString(url_ref); |
Dan Willemsen | d279748 | 2017-07-26 13:13:13 -0700 | [diff] [blame] | 110 | char buf[MAXPATHLEN]; |
| 111 | Boolean res = CFStringGetCString(url_str_ref, buf, sizeof(buf), kCFStringEncodingUTF8); |
| 112 | CFRelease(url_ref); |
| 113 | if (!res) { |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 114 | fprintf(stderr, "runtime/cgo: cannot get URL string\n"); |
| 115 | return; |
| 116 | } |
| 117 | |
| 118 | // url is of the form "file:///path/to/Info.plist". |
| 119 | // strip it down to the working directory "/path/to". |
Dan Willemsen | d279748 | 2017-07-26 13:13:13 -0700 | [diff] [blame] | 120 | int url_len = strlen(buf); |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 121 | if (url_len < sizeof("file://")+sizeof("/Info.plist")) { |
Dan Willemsen | d279748 | 2017-07-26 13:13:13 -0700 | [diff] [blame] | 122 | fprintf(stderr, "runtime/cgo: bad URL: %s\n", buf); |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 123 | return; |
| 124 | } |
Dan Willemsen | d279748 | 2017-07-26 13:13:13 -0700 | [diff] [blame] | 125 | buf[url_len-sizeof("/Info.plist")+1] = 0; |
| 126 | char *dir = &buf[0] + sizeof("file://")-1; |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 127 | |
| 128 | if (chdir(dir) != 0) { |
| 129 | fprintf(stderr, "runtime/cgo: chdir(%s) failed\n", dir); |
| 130 | } |
| 131 | |
Dan Willemsen | d279748 | 2017-07-26 13:13:13 -0700 | [diff] [blame] | 132 | // The test harness in go_darwin_arm_exec passes the relative working directory |
| 133 | // in the GoExecWrapperWorkingDirectory property of the app bundle. |
| 134 | CFStringRef wd_ref = CFBundleGetValueForInfoDictionaryKey(bundle, CFSTR("GoExecWrapperWorkingDirectory")); |
| 135 | if (wd_ref != NULL) { |
| 136 | if (!CFStringGetCString(wd_ref, buf, sizeof(buf), kCFStringEncodingUTF8)) { |
| 137 | fprintf(stderr, "runtime/cgo: cannot get GoExecWrapperWorkingDirectory string\n"); |
| 138 | return; |
| 139 | } |
| 140 | if (chdir(buf) != 0) { |
| 141 | fprintf(stderr, "runtime/cgo: chdir(%s) failed\n", buf); |
| 142 | } |
Dan Willemsen | d279748 | 2017-07-26 13:13:13 -0700 | [diff] [blame] | 143 | } |
Dan Willemsen | 09eb3b1 | 2015-09-16 14:34:17 -0700 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | void |
| 147 | x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase) |
| 148 | { |
| 149 | pthread_attr_t attr; |
| 150 | size_t size; |
| 151 | |
| 152 | setg_gcc = setg; |
| 153 | pthread_attr_init(&attr); |
| 154 | pthread_attr_getstacksize(&attr, &size); |
| 155 | g->stacklo = (uintptr)&attr - size + 4096; |
| 156 | pthread_attr_destroy(&attr); |
| 157 | |
| 158 | // yes, tlsbase from mrc might not be correctly aligned. |
| 159 | inittls(tlsg, (void**)((uintptr)tlsbase & ~3)); |
| 160 | |
| 161 | darwin_arm_init_mach_exception_handler(); |
| 162 | darwin_arm_init_thread_exception_port(); |
| 163 | init_working_dir(); |
| 164 | } |