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-rw-r--r--qemu/include/exec/user/thunk.h191
1 files changed, 191 insertions, 0 deletions
diff --git a/qemu/include/exec/user/thunk.h b/qemu/include/exec/user/thunk.h
new file mode 100644
index 000000000..3b6746272
--- /dev/null
+++ b/qemu/include/exec/user/thunk.h
@@ -0,0 +1,191 @@
+/*
+ * Generic thunking code to convert data between host and target CPU
+ *
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef THUNK_H
+#define THUNK_H
+
+#include <inttypes.h>
+#include "cpu.h"
+
+/* types enums definitions */
+
+typedef enum argtype {
+ TYPE_NULL,
+ TYPE_CHAR,
+ TYPE_SHORT,
+ TYPE_INT,
+ TYPE_LONG,
+ TYPE_ULONG,
+ TYPE_PTRVOID, /* pointer on unknown data */
+ TYPE_LONGLONG,
+ TYPE_ULONGLONG,
+ TYPE_PTR,
+ TYPE_ARRAY,
+ TYPE_STRUCT,
+ TYPE_OLDDEVT,
+} argtype;
+
+#define MK_PTR(type) TYPE_PTR, type
+#define MK_ARRAY(type, size) TYPE_ARRAY, size, type
+#define MK_STRUCT(id) TYPE_STRUCT, id
+
+#define THUNK_TARGET 0
+#define THUNK_HOST 1
+
+typedef struct {
+ /* standard struct handling */
+ const argtype *field_types;
+ int nb_fields;
+ int *field_offsets[2];
+ /* special handling */
+ void (*convert[2])(void *dst, const void *src);
+ int size[2];
+ int align[2];
+ const char *name;
+} StructEntry;
+
+/* Translation table for bitmasks... */
+typedef struct bitmask_transtbl {
+ unsigned int x86_mask;
+ unsigned int x86_bits;
+ unsigned int alpha_mask;
+ unsigned int alpha_bits;
+} bitmask_transtbl;
+
+void thunk_register_struct(int id, const char *name, const argtype *types);
+void thunk_register_struct_direct(int id, const char *name,
+ const StructEntry *se1);
+const argtype *thunk_convert(void *dst, const void *src,
+ const argtype *type_ptr, int to_host);
+#ifndef NO_THUNK_TYPE_SIZE
+
+extern StructEntry *struct_entries;
+
+int thunk_type_size_array(const argtype *type_ptr, int is_host);
+int thunk_type_align_array(const argtype *type_ptr, int is_host);
+
+static inline int thunk_type_size(const argtype *type_ptr, int is_host)
+{
+ int type, size;
+ const StructEntry *se;
+
+ type = *type_ptr;
+ switch(type) {
+ case TYPE_CHAR:
+ return 1;
+ case TYPE_SHORT:
+ return 2;
+ case TYPE_INT:
+ return 4;
+ case TYPE_LONGLONG:
+ case TYPE_ULONGLONG:
+ return 8;
+ case TYPE_LONG:
+ case TYPE_ULONG:
+ case TYPE_PTRVOID:
+ case TYPE_PTR:
+ if (is_host) {
+ return sizeof(void *);
+ } else {
+ return TARGET_ABI_BITS / 8;
+ }
+ break;
+ case TYPE_OLDDEVT:
+ if (is_host) {
+#if defined(HOST_X86_64)
+ return 8;
+#elif defined(HOST_ALPHA) || defined(HOST_IA64) || defined(HOST_MIPS) || \
+ defined(HOST_PARISC) || defined(HOST_SPARC64)
+ return 4;
+#elif defined(HOST_PPC)
+ return sizeof(void *);
+#else
+ return 2;
+#endif
+ } else {
+#if defined(TARGET_X86_64)
+ return 8;
+#elif defined(TARGET_ALPHA) || defined(TARGET_IA64) || defined(TARGET_MIPS) || \
+ defined(TARGET_PARISC) || defined(TARGET_SPARC64)
+ return 4;
+#elif defined(TARGET_PPC)
+ return TARGET_ABI_BITS / 8;
+#else
+ return 2;
+#endif
+ }
+ break;
+ case TYPE_ARRAY:
+ size = type_ptr[1];
+ return size * thunk_type_size_array(type_ptr + 2, is_host);
+ case TYPE_STRUCT:
+ se = struct_entries + type_ptr[1];
+ return se->size[is_host];
+ default:
+ return -1;
+ }
+}
+
+static inline int thunk_type_align(const argtype *type_ptr, int is_host)
+{
+ int type;
+ const StructEntry *se;
+
+ type = *type_ptr;
+ switch(type) {
+ case TYPE_CHAR:
+ return 1;
+ case TYPE_SHORT:
+ return 2;
+ case TYPE_INT:
+ return 4;
+ case TYPE_LONGLONG:
+ case TYPE_ULONGLONG:
+ return 8;
+ case TYPE_LONG:
+ case TYPE_ULONG:
+ case TYPE_PTRVOID:
+ case TYPE_PTR:
+ if (is_host) {
+ return sizeof(void *);
+ } else {
+ return TARGET_ABI_BITS / 8;
+ }
+ break;
+ case TYPE_OLDDEVT:
+ return thunk_type_size(type_ptr, is_host);
+ case TYPE_ARRAY:
+ return thunk_type_align_array(type_ptr + 2, is_host);
+ case TYPE_STRUCT:
+ se = struct_entries + type_ptr[1];
+ return se->align[is_host];
+ default:
+ return -1;
+ }
+}
+
+#endif /* NO_THUNK_TYPE_SIZE */
+
+unsigned int target_to_host_bitmask(unsigned int x86_mask,
+ const bitmask_transtbl * trans_tbl);
+unsigned int host_to_target_bitmask(unsigned int alpha_mask,
+ const bitmask_transtbl * trans_tbl);
+
+void thunk_init(unsigned int max_structs);
+
+#endif