jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
1#!/usr/bin/env python
2# -*- coding: utf-8 -*-
3
4"""
5Type-transformation rules.
6"""
7
8__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
9__copyright__ = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>"
10__license__ = "GPL version 2 or (at your option) any later version"
11
12__maintainer__ = "Stefan Hajnoczi"
13__email__ = "stefanha@linux.vnet.ibm.com"
14
15
16def _transform_type(type_, trans):
17 if isinstance(trans, str):
18 return trans
19 elif isinstance(trans, dict):
20 if type_ in trans:
21 return _transform_type(type_, trans[type_])
22 elif None in trans:
23 return _transform_type(type_, trans[None])
24 else:
25 return type_
26 elif callable(trans):
27 return trans(type_)
28 else:
29 raise ValueError("Invalid type transformation rule: %s" % trans)
30
31
32def transform_type(type_, *trans):
33 """Return a new type transformed according to the given rules.
34
35 Applies each of the transformation rules in trans in order.
36
37 If an element of trans is a string, return it.
38
39 If an element of trans is a function, call it with type_ as its only
40 argument.
41
42 If an element of trans is a dict, search type_ in its keys. If type_ is
43 a key, use the value as a transformation rule for type_. Otherwise, if
44 None is a key use the value as a transformation rule for type_.
45
46 Otherwise, return type_.
47
48 Parameters
49 ----------
50 type_ : str
51 Type to transform.
52 trans : list of function or dict
53 Type transformation rules.
54 """
55 if len(trans) == 0:
56 raise ValueError
57 res = type_
58 for t in trans:
59 res = _transform_type(res, t)
60 return res
61
62
63##################################################
64# tcg -> host
65
66def _tcg_2_host(type_):
67 if type_ == "TCGv":
68 # force a fixed-size type (target-independent)
69 return "uint64_t"
70 else:
71 return type_
72
73TCG_2_HOST = {
74 "TCGv_i32": "uint32_t",
75 "TCGv_i64": "uint64_t",
76 "TCGv_ptr": "void *",
77 None: _tcg_2_host,
78 }
79
80
81##################################################
82# host -> host compatible with tcg sizes
83
84HOST_2_TCG_COMPAT = {
85 "uint8_t": "uint32_t",
86 }
87
88
89##################################################
90# host/tcg -> tcg
91
92def _host_2_tcg(type_):
93 if type_.startswith("TCGv"):
94 return type_
95 raise ValueError("Don't know how to translate '%s' into a TCG type\n" % type_)
96
97HOST_2_TCG = {
98 "uint32_t": "TCGv_i32",
99 "uint64_t": "TCGv_i64",
100 "void *" : "TCGv_ptr",
101 "CPUArchState *": "TCGv_env",
102 None: _host_2_tcg,
103 }
104
105
106##################################################
107# tcg -> tcg helper definition
108
109def _tcg_2_helper_def(type_):
110 if type_ == "TCGv":
111 return "target_ulong"
112 else:
113 return type_
114
115TCG_2_TCG_HELPER_DEF = {
116 "TCGv_i32": "uint32_t",
117 "TCGv_i64": "uint64_t",
118 "TCGv_ptr": "void *",
119 None: _tcg_2_helper_def,
120 }
121
122
123##################################################
124# tcg -> tcg helper declaration
125
126def _tcg_2_tcg_helper_decl_error(type_):
127 raise ValueError("Don't know how to translate type '%s' into a TCG helper declaration type\n" % type_)
128
129TCG_2_TCG_HELPER_DECL = {
130 "TCGv" : "tl",
131 "TCGv_ptr": "ptr",
132 "TCGv_i32": "i32",
133 "TCGv_i64": "i64",
134 "TCGv_env": "env",
135 None: _tcg_2_tcg_helper_decl_error,
136 }
137
138
139##################################################
140# host/tcg -> tcg temporal constant allocation
141
142def _host_2_tcg_tmp_new(type_):
143 if type_.startswith("TCGv"):
144 return "tcg_temp_new_nop"
145 raise ValueError("Don't know how to translate type '%s' into a TCG temporal allocation" % type_)
146
147HOST_2_TCG_TMP_NEW = {
148 "uint32_t": "tcg_const_i32",
149 "uint64_t": "tcg_const_i64",
150 "void *" : "tcg_const_ptr",
151 None: _host_2_tcg_tmp_new,
152 }
153
154
155##################################################
156# host/tcg -> tcg temporal constant deallocation
157
158def _host_2_tcg_tmp_free(type_):
159 if type_.startswith("TCGv"):
160 return "tcg_temp_free_nop"
161 raise ValueError("Don't know how to translate type '%s' into a TCG temporal deallocation" % type_)
162
163HOST_2_TCG_TMP_FREE = {
164 "uint32_t": "tcg_temp_free_i32",
165 "uint64_t": "tcg_temp_free_i64",
166 "void *" : "tcg_temp_free_ptr",
167 None: _host_2_tcg_tmp_free,
168 }