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macros-i386.h
1 /* -*- mode: c++; indent-tabs-mode: nil -*- */
2 /*
3  Qore Programming Language
4 
5  Copyright 2003 - 2013 David Nichols
6 
7  This library is free software; you can redistribute it and/or
8  modify it under the terms of the GNU Lesser General Public
9  License as published by the Free Software Foundation; either
10  version 2.1 of the License, or (at your option) any later version.
11 
12  This library is distributed in the hope that it will be useful,
13  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  Lesser General Public License for more details.
16 
17  You should have received a copy of the GNU Lesser General Public
18  License along with this library; if not, write to the Free Software
19  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21 
22 #ifndef _QORE_MACHINE_MACROS_H
23 #define _QORE_MACHINE_MACROS_H
24 
25 #define STACK_DIRECTION_DOWN 1
26 
27 #ifdef __GNUC__
28 #define HAVE_ATOMIC_MACROS
29 
30 // returns 1 when counter reaches zero, 0 if not
31 static inline int atomic_dec(volatile int *a) {
32  unsigned char rc;
33 
34  __asm(
35  "lock; decl %0; sete %1"
36  : "=m" (*a), "=qm" (rc)
37  : "m" (*a) : "memory"
38  );
39  return rc != 0;
40 }
41 
42 static inline void atomic_inc(volatile int *a) {
43  __asm(
44  "lock; incl %0"
45  : "=m" (*a)
46  );
47 }
48 
49 #define HAVE_CHECK_STACK_POS
50 
51 static inline size_t get_stack_pos() {
52  size_t addr;
53  __asm("movl %%esp, %0" : "=g" (addr) );
54  return addr;
55 }
56 
57 #endif // __GNUC__
58 
59 #ifdef __SUNPRO_CC
60 #define HAVE_ATOMIC_MACROS
61 
62 // these routines are implemented in assembler
63 extern "C" int atomic_dec(volatile int *a);
64 extern "C" void atomic_inc(volatile int *a);
65 
66 #define HAVE_CHECK_STACK_POS
67 extern "C" size_t get_stack_pos();
68 #endif // #ifdef __SUNPRO_CC
69 
70 #endif // #ifndef _QORE_MACHINE_MACROS_H
71