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-rw-r--r--thunk.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/thunk.c b/thunk.c
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index 0000000000..62520a2976
--- /dev/null
+++ b/thunk.c
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+/*
+ * Generic thunking code to convert data between host and target CPU
+ *
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "gemu.h"
+#include "thunk.h"
+
+//#define DEBUG
+
+#define MAX_STRUCTS 128
+
+/* XXX: make it dynamic */
+static StructEntry struct_entries[MAX_STRUCTS];
+
+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 HOST_LONG_SIZE;
+ } else {
+ return TARGET_LONG_SIZE;
+ }
+ break;
+ case TYPE_ARRAY:
+ size = type_ptr[1];
+ return size * thunk_type_size(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 HOST_LONG_SIZE;
+ } else {
+ return TARGET_LONG_SIZE;
+ }
+ break;
+ case TYPE_ARRAY:
+ return thunk_type_align(type_ptr + 2, is_host);
+ case TYPE_STRUCT:
+ se = struct_entries + type_ptr[1];
+ return se->align[is_host];
+ default:
+ return -1;
+ }
+}
+
+static inline const argtype *thunk_type_next(const argtype *type_ptr)
+{
+ int type;
+
+ type = *type_ptr++;
+ switch(type) {
+ case TYPE_CHAR:
+ case TYPE_SHORT:
+ case TYPE_INT:
+ case TYPE_LONGLONG:
+ case TYPE_ULONGLONG:
+ case TYPE_LONG:
+ case TYPE_ULONG:
+ case TYPE_PTRVOID:
+ return type_ptr;
+ case TYPE_PTR:
+ return thunk_type_next(type_ptr);
+ case TYPE_ARRAY:
+ return thunk_type_next(type_ptr + 1);
+ case TYPE_STRUCT:
+ return type_ptr + 1;
+ default:
+ return NULL;
+ }
+}
+
+void thunk_register_struct(int id, const char *name, const argtype *types)
+{
+ const argtype *type_ptr;
+ StructEntry *se;
+ int nb_fields, offset, max_align, align, size, i, j;
+
+ se = struct_entries + id;
+
+ /* first we count the number of fields */
+ type_ptr = types;
+ nb_fields = 0;
+ while (*type_ptr != TYPE_NULL) {
+ type_ptr = thunk_type_next(type_ptr);
+ nb_fields++;
+ }
+ se->field_types = types;
+ se->nb_fields = nb_fields;
+ se->name = name;
+#ifdef DEBUG
+ printf("struct %s: id=%d nb_fields=%d\n",
+ se->name, id, se->nb_fields);
+#endif
+ /* now we can alloc the data */
+
+ for(i = 0;i < 2; i++) {
+ offset = 0;
+ max_align = 1;
+ se->field_offsets[i] = malloc(nb_fields * sizeof(int));
+ type_ptr = se->field_types;
+ for(j = 0;j < nb_fields; j++) {
+ size = thunk_type_size(type_ptr, i);
+ align = thunk_type_align(type_ptr, i);
+ offset = (offset + align - 1) & ~(align - 1);
+ se->field_offsets[i][j] = offset;
+ offset += size;
+ if (align > max_align)
+ max_align = align;
+ }
+ offset = (offset + max_align - 1) & ~(max_align - 1);
+ se->size[i] = offset;
+ se->align[i] = max_align;
+#ifdef DEBUG
+ printf("%s: size=%d align=%d\n",
+ i == THUNK_HOST ? "host" : "target", offset, max_align);
+#endif
+ }
+}
+
+void thunk_register_struct_direct(int id, const char *name, StructEntry *se1)
+{
+ StructEntry *se;
+ se = struct_entries + id;
+ *se = *se1;
+ se->name = name;
+}
+
+
+/* now we can define the main conversion functions */
+const argtype *thunk_convert(void *dst, const void *src,
+ const argtype *type_ptr, int to_host)
+{
+ int type;
+
+ type = *type_ptr++;
+ switch(type) {
+ case TYPE_CHAR:
+ *(uint8_t *)dst = *(uint8_t *)src;
+ break;
+ case TYPE_SHORT:
+ *(uint16_t *)dst = tswap16(*(uint16_t *)src);
+ break;
+ case TYPE_INT:
+ *(uint32_t *)dst = tswap32(*(uint32_t *)src);
+ break;
+ case TYPE_LONGLONG:
+ case TYPE_ULONGLONG:
+ *(uint64_t *)dst = tswap64(*(uint64_t *)src);
+ break;
+#if HOST_LONG_BITS == 32 && TARGET_LONG_BITS == 32
+ case TYPE_LONG:
+ case TYPE_ULONG:
+ case TYPE_PTRVOID:
+ *(uint32_t *)dst = tswap32(*(uint32_t *)src);
+ break;
+#elif HOST_LONG_BITS == 64 && TARGET_LONG_BITS == 32
+ case TYPE_LONG:
+ case TYPE_ULONG:
+ case TYPE_PTRVOID:
+ if (target_to_host) {
+ *(uint64_t *)dst = tswap32(*(uint32_t *)src);
+ } else {
+ *(uint32_t *)dst = tswap32(*(uint64_t *)src & 0xffffffff);
+ }
+ break;
+#else
+#error unsupported conversion
+#endif
+ case TYPE_ARRAY:
+ {
+ int array_length, i, dst_size, src_size;
+ const uint8_t *s;
+ uint8_t *d;
+
+ array_length = *type_ptr++;
+ dst_size = thunk_type_size(type_ptr, to_host);
+ src_size = thunk_type_size(type_ptr, 1 - to_host);
+ d = dst;
+ s = src;
+ for(i = 0;i < array_length; i++) {
+ thunk_convert(d, s, type_ptr, to_host);
+ d += dst_size;
+ s += src_size;
+ }
+ type_ptr = thunk_type_next(type_ptr);
+ }
+ break;
+ case TYPE_STRUCT:
+ {
+ int i;
+ const StructEntry *se;
+ const uint8_t *s;
+ uint8_t *d;
+ const argtype *field_types;
+ const int *dst_offsets, *src_offsets;
+
+ se = struct_entries + *type_ptr++;
+ if (se->convert[0] != NULL) {
+ /* specific conversion is needed */
+ (*se->convert[to_host])(dst, src);
+ } else {
+ /* standard struct conversion */
+ field_types = se->field_types;
+ dst_offsets = se->field_offsets[to_host];
+ src_offsets = se->field_offsets[1 - to_host];
+ d = dst;
+ s = src;
+ for(i = 0;i < se->nb_fields; i++) {
+ field_types = thunk_convert(d + dst_offsets[i],
+ s + src_offsets[i],
+ field_types, to_host);
+ }
+ }
+ }
+ break;
+ default:
+ fprintf(stderr, "Invalid type 0x%x\n", type);
+ break;
+ }
+ return type_ptr;
+}
+
+/* from em86 */
+
+/* Utility function: Table-driven functions to translate bitmasks
+ * between X86 and Alpha formats...
+ */
+unsigned int target_to_host_bitmask(unsigned int x86_mask,
+ bitmask_transtbl * trans_tbl)
+{
+ bitmask_transtbl * btp;
+ unsigned int alpha_mask = 0;
+
+ for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) {
+ if((x86_mask & btp->x86_mask) == btp->x86_bits) {
+ alpha_mask |= btp->alpha_bits;
+ }
+ }
+ return(alpha_mask);
+}
+
+unsigned int host_to_target_bitmask(unsigned int alpha_mask,
+ bitmask_transtbl * trans_tbl)
+{
+ bitmask_transtbl * btp;
+ unsigned int x86_mask = 0;
+
+ for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) {
+ if((alpha_mask & btp->alpha_mask) == btp->alpha_bits) {
+ x86_mask |= btp->x86_mask;
+ }
+ }
+ return(x86_mask);
+}
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