/* * 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/>. */ #include "qemu/osdep.h" #include "qemu.h" #include "exec/user/thunk.h" //#define DEBUG static unsigned int max_struct_entries; StructEntry *struct_entries; static const argtype *thunk_type_next_ptr(const argtype *type_ptr); 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: case TYPE_OLDDEVT: return type_ptr; case TYPE_PTR: return thunk_type_next_ptr(type_ptr); case TYPE_ARRAY: return thunk_type_next_ptr(type_ptr + 1); case TYPE_STRUCT: return type_ptr + 1; default: return NULL; } } static const argtype *thunk_type_next_ptr(const argtype *type_ptr) { return thunk_type_next(type_ptr); } 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; assert(id < max_struct_entries); 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; type_ptr = thunk_type_next(type_ptr); } 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, const StructEntry *se1) { StructEntry *se; assert(id < max_struct_entries); 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_ABI_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_ABI_BITS == 32 case TYPE_LONG: case TYPE_ULONG: case TYPE_PTRVOID: if (to_host) { if (type == TYPE_LONG) { /* sign extension */ *(uint64_t *)dst = (int32_t)tswap32(*(uint32_t *)src); } else { *(uint64_t *)dst = tswap32(*(uint32_t *)src); } } else { *(uint32_t *)dst = tswap32(*(uint64_t *)src & 0xffffffff); } break; #elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64 case TYPE_LONG: case TYPE_ULONG: case TYPE_PTRVOID: *(uint64_t *)dst = tswap64(*(uint64_t *)src); break; #elif HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 64 case TYPE_LONG: case TYPE_ULONG: case TYPE_PTRVOID: if (to_host) { *(uint32_t *)dst = tswap64(*(uint64_t *)src); } else { if (type == TYPE_LONG) { /* sign extension */ *(uint64_t *)dst = tswap64(*(int32_t *)src); } else { *(uint64_t *)dst = tswap64(*(uint32_t *)src); } } break; #else #warning unsupported conversion #endif case TYPE_OLDDEVT: { uint64_t val = 0; switch (thunk_type_size(type_ptr - 1, !to_host)) { case 2: val = *(uint16_t *)src; break; case 4: val = *(uint32_t *)src; break; case 8: val = *(uint64_t *)src; break; } switch (thunk_type_size(type_ptr - 1, to_host)) { case 2: *(uint16_t *)dst = tswap16(val); break; case 4: *(uint32_t *)dst = tswap32(val); break; case 8: *(uint64_t *)dst = tswap64(val); break; } break; } 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; assert(*type_ptr < max_struct_entries); 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 host and target formats */ unsigned int target_to_host_bitmask(unsigned int target_mask, const bitmask_transtbl * trans_tbl) { const bitmask_transtbl *btp; unsigned int host_mask = 0; for (btp = trans_tbl; btp->target_mask && btp->host_mask; btp++) { if ((target_mask & btp->target_mask) == btp->target_bits) { host_mask |= btp->host_bits; } } return host_mask; } unsigned int host_to_target_bitmask(unsigned int host_mask, const bitmask_transtbl * trans_tbl) { const bitmask_transtbl *btp; unsigned int target_mask = 0; for (btp = trans_tbl; btp->target_mask && btp->host_mask; btp++) { if ((host_mask & btp->host_mask) == btp->host_bits) { target_mask |= btp->target_bits; } } return target_mask; } int thunk_type_size_array(const argtype *type_ptr, int is_host) { return thunk_type_size(type_ptr, is_host); } int thunk_type_align_array(const argtype *type_ptr, int is_host) { return thunk_type_align(type_ptr, is_host); } void thunk_init(unsigned int max_structs) { max_struct_entries = max_structs; struct_entries = g_new0(StructEntry, max_structs); }