Text file
src/runtime/cgo/gcc_stack_unix.c
1 // Copyright 2023 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 && !darwin
6
7 #ifndef _GNU_SOURCE // pthread_getattr_np
8 #define _GNU_SOURCE
9 #endif
10
11 #include <pthread.h>
12 #include "libcgo.h"
13
14 void
15 x_cgo_getstackbound(uintptr bounds[2])
16 {
17 pthread_attr_t attr;
18 void *addr;
19 size_t size;
20
21 #if defined(__GLIBC__) || (defined(__sun) && !defined(__illumos__))
22 // pthread_getattr_np is a GNU extension supported in glibc.
23 // Solaris is not glibc but does support pthread_getattr_np
24 // (and the fallback doesn't work...). Illumos does not.
25 pthread_getattr_np(pthread_self(), &attr); // GNU extension
26 pthread_attr_getstack(&attr, &addr, &size); // low address
27 #elif defined(__illumos__)
28 pthread_attr_init(&attr);
29 pthread_attr_get_np(pthread_self(), &attr);
30 pthread_attr_getstack(&attr, &addr, &size); // low address
31 #else
32 // We don't know how to get the current stacks, so assume they are the
33 // same as the default stack bounds.
34 pthread_attr_init(&attr);
35 pthread_attr_getstacksize(&attr, &size);
36 addr = __builtin_frame_address(0) + 4096 - size;
37 #endif
38 pthread_attr_destroy(&attr);
39
40 bounds[0] = (uintptr)addr;
41 bounds[1] = (uintptr)addr + size;
42 }
43
View as plain text