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 //go:build unix
6
7 #include "libcgo.h"
8 #include "libcgo_unix.h"
9
10 // Platform-specific hooks.
11 void (*x_cgo_inittls)(void **tlsg, void **tlsbase) __attribute__((weak));
12 void (*x_cgo_init_platform)(void) __attribute__((weak));
13 void (*x_cgo_threadentry_platform)(void) __attribute__((weak));
14
15 static void (*setg_gcc)(void*);
16
17 // _cgo_set_stacklo sets g->stacklo based on the stack size.
18 // This is common code called from x_cgo_init, which is itself
19 // called by rt0_go in the runtime package.
20 static void
21 _cgo_set_stacklo(G *g)
22 {
23 uintptr bounds[2];
24
25 x_cgo_getstackbound(bounds);
26
27 g->stacklo = bounds[0];
28
29 // Sanity check the results now, rather than getting a
30 // morestack on g0 crash.
31 if (g->stacklo >= g->stackhi) {
32 fprintf(stderr, "runtime/cgo: bad stack bounds: lo=%p hi=%p\n", (void*)(g->stacklo), (void*)(g->stackhi));
33 abort();
34 }
35 }
36
37 void
38 x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
39 {
40 setg_gcc = setg;
41 _cgo_set_stacklo(g);
42
43 if (x_cgo_inittls) {
44 x_cgo_inittls(tlsg, tlsbase);
45 }
46 if (x_cgo_init_platform) {
47 x_cgo_init_platform();
48 }
49 }
50
51 void*
52 threadentry(void *v)
53 {
54 ThreadStart ts;
55
56 ts = *(ThreadStart*)v;
57 _cgo_tsan_acquire();
58 free(v);
59 _cgo_tsan_release();
60
61 if (x_cgo_threadentry_platform != NULL) {
62 x_cgo_threadentry_platform();
63 }
64
65 crosscall1(ts.fn, setg_gcc, ts.g);
66 return NULL;
67 }
68
View as plain text