jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
1/*
2 * Generic thunking code to convert data between host and target CPU
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19#ifndef THUNK_H
20#define THUNK_H
21
22#include "cpu.h"
23
24/* types enums definitions */
25
26typedef enum argtype {
27 TYPE_NULL,
28 TYPE_CHAR,
29 TYPE_SHORT,
30 TYPE_INT,
31 TYPE_LONG,
32 TYPE_ULONG,
33 TYPE_PTRVOID, /* pointer on unknown data */
34 TYPE_LONGLONG,
35 TYPE_ULONGLONG,
36 TYPE_PTR,
37 TYPE_ARRAY,
38 TYPE_STRUCT,
39 TYPE_OLDDEVT,
40} argtype;
41
42#define MK_PTR(type) TYPE_PTR, type
43#define MK_ARRAY(type, size) TYPE_ARRAY, size, type
44#define MK_STRUCT(id) TYPE_STRUCT, id
45
46#define THUNK_TARGET 0
47#define THUNK_HOST 1
48
49typedef struct {
50 /* standard struct handling */
51 const argtype *field_types;
52 int nb_fields;
53 int *field_offsets[2];
54 /* special handling */
55 void (*convert[2])(void *dst, const void *src);
56 int size[2];
57 int align[2];
58 const char *name;
59} StructEntry;
60
61/* Translation table for bitmasks... */
62typedef struct bitmask_transtbl {
63 unsigned int target_mask;
64 unsigned int target_bits;
65 unsigned int host_mask;
66 unsigned int host_bits;
67} bitmask_transtbl;
68
69void thunk_register_struct(int id, const char *name, const argtype *types);
70void thunk_register_struct_direct(int id, const char *name,
71 const StructEntry *se1);
72const argtype *thunk_convert(void *dst, const void *src,
73 const argtype *type_ptr, int to_host);
74
75extern StructEntry *struct_entries;
76
77int thunk_type_size_array(const argtype *type_ptr, int is_host);
78int thunk_type_align_array(const argtype *type_ptr, int is_host);
79
80static inline int thunk_type_size(const argtype *type_ptr, int is_host)
81{
82 int type, size;
83 const StructEntry *se;
84
85 type = *type_ptr;
86 switch(type) {
87 case TYPE_CHAR:
88 return 1;
89 case TYPE_SHORT:
90 return 2;
91 case TYPE_INT:
92 return 4;
93 case TYPE_LONGLONG:
94 case TYPE_ULONGLONG:
95 return 8;
96 case TYPE_LONG:
97 case TYPE_ULONG:
98 case TYPE_PTRVOID:
99 case TYPE_PTR:
100 if (is_host) {
101 return sizeof(void *);
102 } else {
103 return TARGET_ABI_BITS / 8;
104 }
105 break;
106 case TYPE_OLDDEVT:
107 if (is_host) {
108#if defined(HOST_X86_64)
109 return 8;
110#elif defined(HOST_ALPHA) || defined(HOST_IA64) || defined(HOST_MIPS) || \
111 defined(HOST_PARISC) || defined(HOST_SPARC64)
112 return 4;
113#elif defined(HOST_PPC)
114 return sizeof(void *);
115#else
116 return 2;
117#endif
118 } else {
119#if defined(TARGET_X86_64)
120 return 8;
121#elif defined(TARGET_ALPHA) || defined(TARGET_IA64) || defined(TARGET_MIPS) || \
122 defined(TARGET_PARISC) || defined(TARGET_SPARC64)
123 return 4;
124#elif defined(TARGET_PPC)
125 return TARGET_ABI_BITS / 8;
126#else
127 return 2;
128#endif
129 }
130 break;
131 case TYPE_ARRAY:
132 size = type_ptr[1];
133 return size * thunk_type_size_array(type_ptr + 2, is_host);
134 case TYPE_STRUCT:
135 se = struct_entries + type_ptr[1];
136 return se->size[is_host];
137 default:
138 return -1;
139 }
140}
141
142static inline int thunk_type_align(const argtype *type_ptr, int is_host)
143{
144 int type;
145 const StructEntry *se;
146
147 type = *type_ptr;
148 switch(type) {
149 case TYPE_CHAR:
150 return 1;
151 case TYPE_SHORT:
152 return 2;
153 case TYPE_INT:
154 return 4;
155 case TYPE_LONGLONG:
156 case TYPE_ULONGLONG:
157 return 8;
158 case TYPE_LONG:
159 case TYPE_ULONG:
160 case TYPE_PTRVOID:
161 case TYPE_PTR:
162 if (is_host) {
163 return sizeof(void *);
164 } else {
165 return TARGET_ABI_BITS / 8;
166 }
167 break;
168 case TYPE_OLDDEVT:
169 return thunk_type_size(type_ptr, is_host);
170 case TYPE_ARRAY:
171 return thunk_type_align_array(type_ptr + 2, is_host);
172 case TYPE_STRUCT:
173 se = struct_entries + type_ptr[1];
174 return se->align[is_host];
175 default:
176 return -1;
177 }
178}
179
180unsigned int target_to_host_bitmask(unsigned int target_mask,
181 const bitmask_transtbl * trans_tbl);
182unsigned int host_to_target_bitmask(unsigned int host_mask,
183 const bitmask_transtbl * trans_tbl);
184
185void thunk_init(unsigned int max_structs);
186
187#endif