linux-user: fix implicit conversion from enumeration type error
[qemu.git] / include / exec / user / thunk.h
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
20 #ifndef THUNK_H
21 #define THUNK_H
22
23 #include "cpu.h"
24 #include "exec/user/abitypes.h"
25
26 /* types enums definitions */
27
28 typedef enum argtype {
29 TYPE_NULL,
30 TYPE_CHAR,
31 TYPE_SHORT,
32 TYPE_INT,
33 TYPE_LONG,
34 TYPE_ULONG,
35 TYPE_PTRVOID, /* pointer on unknown data */
36 TYPE_LONGLONG,
37 TYPE_ULONGLONG,
38 TYPE_PTR,
39 TYPE_ARRAY,
40 TYPE_STRUCT,
41 TYPE_OLDDEVT,
42 } argtype;
43
44 #define MK_PTR(type) TYPE_PTR, type
45 #define MK_ARRAY(type, size) TYPE_ARRAY, (int)(size), type
46 #define MK_STRUCT(id) TYPE_STRUCT, id
47
48 #define THUNK_TARGET 0
49 #define THUNK_HOST 1
50
51 typedef struct {
52 /* standard struct handling */
53 const argtype *field_types;
54 int nb_fields;
55 int *field_offsets[2];
56 /* special handling */
57 void (*convert[2])(void *dst, const void *src);
58 void (*print)(void *arg);
59 int size[2];
60 int align[2];
61 const char *name;
62 } StructEntry;
63
64 /* Translation table for bitmasks... */
65 typedef struct bitmask_transtbl {
66 unsigned int target_mask;
67 unsigned int target_bits;
68 unsigned int host_mask;
69 unsigned int host_bits;
70 } bitmask_transtbl;
71
72 void thunk_register_struct(int id, const char *name, const argtype *types);
73 void thunk_register_struct_direct(int id, const char *name,
74 const StructEntry *se1);
75 const argtype *thunk_convert(void *dst, const void *src,
76 const argtype *type_ptr, int to_host);
77 const argtype *thunk_print(void *arg, const argtype *type_ptr);
78
79 extern StructEntry *struct_entries;
80
81 int thunk_type_size_array(const argtype *type_ptr, int is_host);
82 int thunk_type_align_array(const argtype *type_ptr, int is_host);
83
84 static inline int thunk_type_size(const argtype *type_ptr, int is_host)
85 {
86 int type, size;
87 const StructEntry *se;
88
89 type = *type_ptr;
90 switch(type) {
91 case TYPE_CHAR:
92 return 1;
93 case TYPE_SHORT:
94 return 2;
95 case TYPE_INT:
96 return 4;
97 case TYPE_LONGLONG:
98 case TYPE_ULONGLONG:
99 return 8;
100 case TYPE_LONG:
101 case TYPE_ULONG:
102 case TYPE_PTRVOID:
103 case TYPE_PTR:
104 if (is_host) {
105 return sizeof(void *);
106 } else {
107 return TARGET_ABI_BITS / 8;
108 }
109 break;
110 case TYPE_OLDDEVT:
111 if (is_host) {
112 #if defined(HOST_X86_64)
113 return 8;
114 #elif defined(HOST_ALPHA) || defined(HOST_IA64) || defined(HOST_MIPS) || \
115 defined(HOST_PARISC) || defined(HOST_SPARC64)
116 return 4;
117 #elif defined(HOST_PPC)
118 return sizeof(void *);
119 #else
120 return 2;
121 #endif
122 } else {
123 #if defined(TARGET_X86_64)
124 return 8;
125 #elif defined(TARGET_ALPHA) || defined(TARGET_IA64) || defined(TARGET_MIPS) || \
126 defined(TARGET_PARISC) || defined(TARGET_SPARC64)
127 return 4;
128 #elif defined(TARGET_PPC)
129 return TARGET_ABI_BITS / 8;
130 #else
131 return 2;
132 #endif
133 }
134 break;
135 case TYPE_ARRAY:
136 size = type_ptr[1];
137 return size * thunk_type_size_array(type_ptr + 2, is_host);
138 case TYPE_STRUCT:
139 se = struct_entries + type_ptr[1];
140 return se->size[is_host];
141 default:
142 g_assert_not_reached();
143 }
144 }
145
146 static inline int thunk_type_align(const argtype *type_ptr, int is_host)
147 {
148 int type;
149 const StructEntry *se;
150
151 type = *type_ptr;
152 switch(type) {
153 case TYPE_CHAR:
154 return 1;
155 case TYPE_SHORT:
156 if (is_host) {
157 return __alignof__(short);
158 } else {
159 return ABI_SHORT_ALIGNMENT;
160 }
161 case TYPE_INT:
162 if (is_host) {
163 return __alignof__(int);
164 } else {
165 return ABI_INT_ALIGNMENT;
166 }
167 case TYPE_LONGLONG:
168 case TYPE_ULONGLONG:
169 if (is_host) {
170 return __alignof__(long long);
171 } else {
172 return ABI_LLONG_ALIGNMENT;
173 }
174 case TYPE_LONG:
175 case TYPE_ULONG:
176 case TYPE_PTRVOID:
177 case TYPE_PTR:
178 if (is_host) {
179 return __alignof__(long);
180 } else {
181 return ABI_LONG_ALIGNMENT;
182 }
183 break;
184 case TYPE_OLDDEVT:
185 return thunk_type_size(type_ptr, is_host);
186 case TYPE_ARRAY:
187 return thunk_type_align_array(type_ptr + 2, is_host);
188 case TYPE_STRUCT:
189 se = struct_entries + type_ptr[1];
190 return se->align[is_host];
191 default:
192 g_assert_not_reached();
193 }
194 }
195
196 unsigned int target_to_host_bitmask(unsigned int target_mask,
197 const bitmask_transtbl * trans_tbl);
198 unsigned int host_to_target_bitmask(unsigned int host_mask,
199 const bitmask_transtbl * trans_tbl);
200
201 void thunk_init(unsigned int max_structs);
202
203 #endif