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