aboutsummaryrefslogtreecommitdiff
path: root/linuxthreads/sysdeps/alpha/pt-machine.h
blob: b88629405b4069cc08a023c32d504d1152fd37ec (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
/* Machine-dependent pthreads configuration and inline functions.
   Alpha version.
   Copyright (C) 1996, 1997, 1998 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library 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_EI
# define PT_EI extern inline
#endif

#include <asm/pal.h>


/* 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;
}

/* Spinlock release; default is just set to zero.  */
#define RELEASE(spinlock) \
  __asm__ __volatile__("mb" : : : "memory"); \
  *spinlock = 0


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


/* 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");


/* 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) : "$0");	      \
  __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));

  return ret;
}