| 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 2.1 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 USER_THUNK_H |
| 21 | #define USER_THUNK_H |
| 22 | |
| 23 | #ifndef CONFIG_USER_ONLY |
| 24 | #error Cannot include this header from system emulation |
| 25 | #endif |
| 26 | |
| 27 | #include "cpu.h" |
| 28 | #include "user/abitypes.h" |
| 29 | |
| 30 | /* types enums definitions */ |
| 31 | |
| 32 | typedef enum argtype { |
| 33 | TYPE_NULL, |
| 34 | TYPE_CHAR, |
| 35 | TYPE_SHORT, |
| 36 | TYPE_INT, |
| 37 | TYPE_LONG, |
| 38 | TYPE_ULONG, |
| 39 | TYPE_PTRVOID, /* pointer on unknown data */ |
| 40 | TYPE_LONGLONG, |
| 41 | TYPE_ULONGLONG, |
| 42 | TYPE_PTR, |
| 43 | TYPE_ARRAY, |
| 44 | TYPE_STRUCT, |
| 45 | TYPE_OLDDEVT, |
| 46 | } argtype; |
| 47 | |
| 48 | #define MK_PTR(type) TYPE_PTR, type |
| 49 | #define MK_ARRAY(type, size) TYPE_ARRAY, (int)(size), type |
| 50 | #define MK_STRUCT(id) TYPE_STRUCT, id |
| 51 | |
| 52 | #define THUNK_TARGET 0 |
| 53 | #define THUNK_HOST 1 |
| 54 | |
| 55 | typedef struct { |
| 56 | /* standard struct handling */ |
| 57 | const argtype *field_types; |
| 58 | int nb_fields; |
| 59 | int *field_offsets[2]; |
| 60 | /* special handling */ |
| 61 | void (*convert[2])(void *dst, const void *src); |
| 62 | void (*print)(void *arg); |
| 63 | int size[2]; |
| 64 | int align[2]; |
| 65 | const char *name; |
| 66 | } StructEntry; |
| 67 | |
| 68 | /* Translation table for bitmasks... */ |
| 69 | typedef struct bitmask_transtbl { |
| 70 | unsigned int target_mask; |
| 71 | unsigned int target_bits; |
| 72 | unsigned int host_mask; |
| 73 | unsigned int host_bits; |
| 74 | } bitmask_transtbl; |
| 75 | |
| 76 | void thunk_register_struct(int id, const char *name, const argtype *types); |
| 77 | void thunk_register_struct_direct(int id, const char *name, |
| 78 | const StructEntry *se1); |
| 79 | const argtype *thunk_convert(void *dst, const void *src, |
| 80 | const argtype *type_ptr, int to_host); |
| 81 | const argtype *thunk_print(void *arg, const argtype *type_ptr); |
| 82 | |
| 83 | extern StructEntry *struct_entries; |
| 84 | |
| 85 | int thunk_type_size_array(const argtype *type_ptr, int is_host); |
| 86 | int thunk_type_align_array(const argtype *type_ptr, int is_host); |
| 87 | |
| 88 | static inline int thunk_type_size(const argtype *type_ptr, int is_host) |
| 89 | { |
| 90 | int type, size; |
| 91 | const StructEntry *se; |
| 92 | |
| 93 | type = *type_ptr; |
| 94 | switch(type) { |
| 95 | case TYPE_CHAR: |
| 96 | return 1; |
| 97 | case TYPE_SHORT: |
| 98 | return 2; |
| 99 | case TYPE_INT: |
| 100 | return 4; |
| 101 | case TYPE_LONGLONG: |
| 102 | case TYPE_ULONGLONG: |
| 103 | return 8; |
| 104 | case TYPE_LONG: |
| 105 | case TYPE_ULONG: |
| 106 | case TYPE_PTRVOID: |
| 107 | case TYPE_PTR: |
| 108 | if (is_host) { |
| 109 | return sizeof(void *); |
| 110 | } else { |
| 111 | return TARGET_ABI_BITS / 8; |
| 112 | } |
| 113 | break; |
| 114 | case TYPE_OLDDEVT: |
| 115 | if (is_host) { |
| 116 | #if defined(HOST_X86_64) |
| 117 | return 8; |
| 118 | #elif defined(HOST_SPARC64) |
| 119 | return 4; |
| 120 | #elif defined(HOST_PPC) |
| 121 | return sizeof(void *); |
| 122 | #else |
| 123 | return 2; |
| 124 | #endif |
| 125 | } else { |
| 126 | #if defined(TARGET_X86_64) |
| 127 | return 8; |
| 128 | #elif defined(TARGET_ALPHA) || defined(TARGET_IA64) || defined(TARGET_MIPS) || \ |
| 129 | defined(TARGET_PARISC) || defined(TARGET_SPARC64) |
| 130 | return 4; |
| 131 | #elif defined(TARGET_PPC) |
| 132 | return TARGET_ABI_BITS / 8; |
| 133 | #else |
| 134 | return 2; |
| 135 | #endif |
| 136 | } |
| 137 | break; |
| 138 | case TYPE_ARRAY: |
| 139 | size = type_ptr[1]; |
| 140 | return size * thunk_type_size_array(type_ptr + 2, is_host); |
| 141 | case TYPE_STRUCT: |
| 142 | se = struct_entries + type_ptr[1]; |
| 143 | return se->size[is_host]; |
| 144 | default: |
| 145 | g_assert_not_reached(); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | static inline int thunk_type_align(const argtype *type_ptr, int is_host) |
| 150 | { |
| 151 | int type; |
| 152 | const StructEntry *se; |
| 153 | |
| 154 | type = *type_ptr; |
| 155 | switch(type) { |
| 156 | case TYPE_CHAR: |
| 157 | return 1; |
| 158 | case TYPE_SHORT: |
| 159 | if (is_host) { |
| 160 | return __alignof__(short); |
| 161 | } else { |
| 162 | return ABI_SHORT_ALIGNMENT; |
| 163 | } |
| 164 | case TYPE_INT: |
| 165 | if (is_host) { |
| 166 | return __alignof__(int); |
| 167 | } else { |
| 168 | return ABI_INT_ALIGNMENT; |
| 169 | } |
| 170 | case TYPE_LONGLONG: |
| 171 | case TYPE_ULONGLONG: |
| 172 | if (is_host) { |
| 173 | return __alignof__(long long); |
| 174 | } else { |
| 175 | return ABI_LLONG_ALIGNMENT; |
| 176 | } |
| 177 | case TYPE_LONG: |
| 178 | case TYPE_ULONG: |
| 179 | case TYPE_PTRVOID: |
| 180 | case TYPE_PTR: |
| 181 | if (is_host) { |
| 182 | return __alignof__(long); |
| 183 | } else { |
| 184 | return ABI_LONG_ALIGNMENT; |
| 185 | } |
| 186 | break; |
| 187 | case TYPE_OLDDEVT: |
| 188 | return thunk_type_size(type_ptr, is_host); |
| 189 | case TYPE_ARRAY: |
| 190 | return thunk_type_align_array(type_ptr + 2, is_host); |
| 191 | case TYPE_STRUCT: |
| 192 | se = struct_entries + type_ptr[1]; |
| 193 | return se->align[is_host]; |
| 194 | default: |
| 195 | g_assert_not_reached(); |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | unsigned int target_to_host_bitmask_len(unsigned int target_mask, |
| 200 | const bitmask_transtbl *trans_tbl, |
| 201 | size_t trans_len); |
| 202 | unsigned int host_to_target_bitmask_len(unsigned int host_mask, |
| 203 | const bitmask_transtbl * trans_tbl, |
| 204 | size_t trans_len); |
| 205 | |
| 206 | #define target_to_host_bitmask(M, T) \ |
| 207 | target_to_host_bitmask_len(M, T, ARRAY_SIZE(T)) |
| 208 | #define host_to_target_bitmask(M, T) \ |
| 209 | host_to_target_bitmask_len(M, T, ARRAY_SIZE(T)) |
| 210 | |
| 211 | void thunk_init(unsigned int max_structs); |
| 212 | |
| 213 | #endif |