summaryrefslogtreecommitdiff
path: root/libpthread/linuxthreads.old/sysdeps/alpha/pt-machine.h
blob: 26805c4e2ba542346d2934f10b83c721f99fdd73 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/* Machine-dependent pthreads configuration and inline functions.
   Alpha version.
   Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003
   Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Richard Henderson <rth@tamu.edu>.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc.,  59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifndef _PT_MACHINE_H
#define _PT_MACHINE_H   1

#include <features.h>

#ifndef PT_EI
# if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
#  define PT_EI static inline __attribute__((always_inline))
# else
#  define PT_EI extern inline __attribute__((always_inline))
# endif
#endif

#ifdef __linux__
# include <asm/pal.h>
#else
# include <machine/pal.h>
#endif

/* Get some notion of the current stack.  Need not be exactly the top
   of the stack, just something somewhere in the current frame.  */
#define CURRENT_STACK_FRAME  stack_pointer
register char *stack_pointer __asm__("$30");


/* Memory barrier; default is to do nothing */
#define MEMORY_BARRIER() __asm__ __volatile__("mb" : : : "memory")
/* Write barrier.  */
#define WRITE_MEMORY_BARRIER() __asm__ __volatile__("wmb" : : : "memory")


/* Spinlock implementation; required.  */
PT_EI long int
testandset (int *spinlock)
{
  long int ret, temp;

  __asm__ __volatile__(
	"/* Inline spinlock test & set */\n"
	"1:\t"
	"ldl_l %0,%3\n\t"
	"bne %0,2f\n\t"
	"or $31,1,%1\n\t"
	"stl_c %1,%2\n\t"
	"beq %1,1b\n"
	"2:\tmb\n"
	"/* End spinlock test & set */"
	: "=&r"(ret), "=&r"(temp), "=m"(*spinlock)
	: "m"(*spinlock)
        : "memory");

  return ret;
}


/* Begin allocating thread stacks at this address.  Default is to allocate
   them just below the initial program stack.  */
#define THREAD_STACK_START_ADDRESS  0x40000000000


/* Return the thread descriptor for the current thread.  */
#define THREAD_SELF \
({									      \
  register pthread_descr __self __asm__("$0");				      \
  __asm__ ("call_pal %1" : "=r"(__self) : "i"(PAL_rduniq));		      \
  __self;								      \
})

/* Initialize the thread-unique value.  */
#define INIT_THREAD_SELF(descr, nr) \
{									      \
  register pthread_descr __self __asm__("$16") = (descr);		      \
  __asm__ __volatile__ ("call_pal %1" : : "r"(__self), "i"(PAL_wruniq));      \
}


/* Compare-and-swap for semaphores. */

#define HAS_COMPARE_AND_SWAP
PT_EI int
__compare_and_swap (long int *p, long int oldval, long int newval)
{
  long int ret;

  __asm__ __volatile__ (
	"/* Inline compare & swap */\n"
	"1:\t"
	"ldq_l %0,%4\n\t"
	"cmpeq %0,%2,%0\n\t"
	"beq %0,2f\n\t"
	"mov %3,%0\n\t"
	"stq_c %0,%1\n\t"
	"beq %0,1b\n\t"
	"2:\tmb\n"
	"/* End compare & swap */"
	: "=&r"(ret), "=m"(*p)
	: "r"(oldval), "r"(newval), "m"(*p)
        : "memory");

  return ret;
}

/* We want the OS to assign stack addresses.  */
#define FLOATING_STACKS 1

/* Maximum size of the stack if the rlimit is unlimited.  */
#define ARCH_STACK_MAX_SIZE     32*1024*1024

#endif /* pt-machine.h */