Text file src/runtime/cgo/gcc_freebsd_arm.c
1 // Copyright 2012 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 <sys/types.h>
6 #include <machine/sysarch.h>
7 #include <sys/signalvar.h>
8 #include <pthread.h>
9 #include <signal.h>
10 #include <string.h>
11 #include "libcgo.h"
12 #include "libcgo_unix.h"
13
14 #ifdef ARM_TP_ADDRESS
15 // ARM_TP_ADDRESS is (ARM_VECTORS_HIGH + 0x1000) or 0xffff1000
16 // and is known to runtime.read_tls_fallback. Verify it with
17 // cpp.
18 #if ARM_TP_ADDRESS != 0xffff1000
19 #error Wrong ARM_TP_ADDRESS!
20 #endif
21 #endif
22
23 static void *threadentry(void*);
24
25 static void (*setg_gcc)(void*);
26
27 void
28 x_cgo_init(G *g, void (*setg)(void*))
29 {
30 pthread_attr_t attr;
31 size_t size;
32
33 setg_gcc = setg;
34 pthread_attr_init(&attr);
35 pthread_attr_getstacksize(&attr, &size);
36 g->stacklo = (uintptr)&attr - size + 4096;
37 pthread_attr_destroy(&attr);
38 }
39
40
41 void
42 _cgo_sys_thread_start(ThreadStart *ts)
43 {
44 pthread_attr_t attr;
45 sigset_t ign, oset;
46 pthread_t p;
47 size_t size;
48 int err;
49
50 SIGFILLSET(ign);
51 pthread_sigmask(SIG_SETMASK, &ign, &oset);
52
53 // Not sure why the memset is necessary here,
54 // but without it, we get a bogus stack size
55 // out of pthread_attr_getstacksize. C'est la Linux.
56 memset(&attr, 0, sizeof attr);
57 pthread_attr_init(&attr);
58 size = 0;
59 pthread_attr_getstacksize(&attr, &size);
60 // Leave stacklo=0 and set stackhi=size; mstart will do the rest.
61 ts->g->stackhi = size;
62 err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
63
64 pthread_sigmask(SIG_SETMASK, &oset, nil);
65
66 if (err != 0) {
67 fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
68 abort();
69 }
70 }
71
72 extern void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
73 static void*
74 threadentry(void *v)
75 {
76 ThreadStart ts;
77
78 ts = *(ThreadStart*)v;
79 free(v);
80
81 crosscall_arm1(ts.fn, setg_gcc, (void*)ts.g);
82 return nil;
83 }
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