xchg.py revision 8610:9bdd52a2214c 
1# Copyright (c) 2007 The Hewlett-Packard Development Company
2# All rights reserved.
3#
4# The license below extends only to copyright in the software and shall
5# not be construed as granting a license to any other intellectual
6# property including but not limited to intellectual property relating
7# to a hardware implementation of the functionality of the software
8# licensed hereunder.  You may use the software subject to the license
9# terms below provided that you ensure that this notice is replicated
10# unmodified and in its entirety in all distributions of the software,
11# modified or unmodified, in source code or in binary form.
12#
13# Redistribution and use in source and binary forms, with or without
14# modification, are permitted provided that the following conditions are
15# met: redistributions of source code must retain the above copyright
16# notice, this list of conditions and the following disclaimer;
17# redistributions in binary form must reproduce the above copyright
18# notice, this list of conditions and the following disclaimer in the
19# documentation and/or other materials provided with the distribution;
20# neither the name of the copyright holders nor the names of its
21# contributors may be used to endorse or promote products derived from
22# this software without specific prior written permission.
23#
24# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
27# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
28# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
34# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35#
36# Authors: Gabe Black
37
38microcode = '''
39
40# All the memory versions need to use LOCK, regardless of if it was set
41
42def macroop XCHG_R_R
43{
44    # Use the xor trick instead of moves to reduce register pressure.
45    # This probably doesn't make much of a difference, but it's easy.
46    xor reg, reg, regm
47    xor regm, regm, reg
48    xor reg, reg, regm
49};
50
51def macroop XCHG_R_M
52{
53    mfence
54    ldstl t1, seg, sib, disp
55    stul reg, seg, sib, disp
56    mfence
57    mov reg, reg, t1
58};
59
60def macroop XCHG_R_P
61{
62    rdip t7
63    mfence
64    ldstl t1, seg, riprel, disp
65    stul reg, seg, riprel, disp
66    mfence
67    mov reg, reg, t1
68};
69
70def macroop XCHG_M_R
71{
72    mfence
73    ldstl t1, seg, sib, disp
74    stul reg, seg, sib, disp
75    mfence
76    mov reg, reg, t1
77};
78
79def macroop XCHG_P_R
80{
81    rdip t7
82    mfence
83    ldstl t1, seg, riprel, disp
84    stul reg, seg, riprel, disp
85    mfence
86    mov reg, reg, t1
87};
88
89def macroop XCHG_LOCKED_M_R
90{
91    mfence
92    ldstl t1, seg, sib, disp
93    stul reg, seg, sib, disp
94    mfence
95    mov reg, reg, t1
96};
97
98def macroop XCHG_LOCKED_P_R
99{
100    rdip t7
101    mfence
102    ldstl t1, seg, riprel, disp
103    stul reg, seg, riprel, disp
104    mfence
105    mov reg, reg, t1
106};
107'''
108