/* ScummVM - Graphic Adventure Engine * * ScummVM is the legal property of its developers, whose names * are too numerous to list here. Please refer to the COPYRIGHT * file distributed with this source distribution. * * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * $URL$ * $Id$ * */ #include "common/debug.h" #include "sci/include/sciresource.h" #include "sci/include/engine.h" #include "sci/include/versions.h" #include "sci/include/kdebug.h" #include "sci/engine/kernel_types.h" #include "sci/engine/seg_manager.h" #include "sci/engine/gc.h" #include "sci/include/sfx_player.h" #ifdef HAVE_SETJMP_H #include #endif reg_t NULL_REG = NULL_REG_INITIALIZER; /*#define VM_DEBUG_SEND*/ #undef STRICT_SEND /* Disallows variable sends with more than one parameter */ #undef STRICT_READ /* Disallows reading from out-of-bounds parameters and locals */ int script_abort_flag = 0; /* Set to 1 to abort execution */ int script_error_flag = 0; /* Set to 1 if an error occured, reset each round by the VM */ int script_checkloads_flag = 0; /* Print info when scripts get (un)loaded */ int script_step_counter = 0; /* Counts the number of steps executed */ int script_gc_interval = GC_INTERVAL; /* Number of steps in between gcs */ extern int _debug_step_running; /* scriptdebug.c */ extern int _debug_seeking; /* scriptdebug.c */ extern int _weak_validations; /* scriptdebug.c */ calls_struct_t *send_calls = NULL; int send_calls_allocated = 0; int bp_flag = 0; static reg_t _dummy_register = NULL_REG_INITIALIZER; #ifdef HAVE_SETJMP_H static int jump_initialized = 0; static jmp_buf vm_error_address; #endif /*-- validation functionality --*/ #ifndef DISABLE_VALIDATIONS static inline reg_t * validate_property(object_t *obj, int index) { if (!obj) { if (sci_debug_flags & 4) sciprintf("[VM] Sending to disposed object!\n"); _dummy_register = NULL_REG; return &_dummy_register; } if (index < 0 || index >= obj->variables_nr) { if (sci_debug_flags & 4) sciprintf("[VM] Invalid property #%d (out of [0..%d]) requested!\n", index, obj->variables_nr); _dummy_register = NULL_REG; return &_dummy_register; } return obj->variables + index; } static inline stack_ptr_t validate_stack_addr(state_t *s, stack_ptr_t sp) { if (sp >= s->stack_base && sp < s->stack_top) return sp; script_debug_flag = script_error_flag = 1; if (sci_debug_flags & 4) sciprintf("[VM] Stack index %d out of valid range [%d..%d]\n", sp - s->stack_base, 0, s->stack_top - s->stack_base - 1); return 0; } static inline int validate_arithmetic(reg_t reg) { if (reg.segment) { if (!_weak_validations) script_debug_flag = script_error_flag = 1; if (sci_debug_flags & 4) sciprintf("[VM] Attempt to read arithmetic value from non-zero segment [%04x]\n", reg.segment); return 0; } return reg.offset; } static inline int signed_validate_arithmetic(reg_t reg) { if (reg.segment) { if (!_weak_validations) script_debug_flag = script_error_flag = 1; if (sci_debug_flags & 4) sciprintf("[VM] Attempt to read arithmetic value from non-zero segment [%04x]\n", reg.segment); return 0; } if (reg.offset&0x8000) return (signed)(reg.offset) - 65536; else return reg.offset; } static inline int validate_variable(reg_t *r, reg_t *stack_base, int type, int max, int index, int line) { const char *names[4] = {"global", "local", "temp", "param"}; if (index < 0 || index >= max) { sciprintf("[VM] Attempt to use invalid %s variable %04x ", names[type], index); if (max == 0) sciprintf("(variable type invalid)"); else sciprintf("(out of range [%d..%d])", 0, max - 1); sciprintf(" in %s, line %d\n", __FILE__, line); if (!_weak_validations) script_debug_flag = script_error_flag = 1; #ifdef STRICT_READ return 1; #else /* !STRICT_READ */ if (type == VAR_PARAM || type == VAR_TEMP) { int total_offset = r - stack_base; if (total_offset < 0 || total_offset >= VM_STACK_SIZE) { sciprintf("[VM] Access would be outside even of the stack (%d); access denied\n", total_offset); return 1; } else { sciprintf("[VM] Access within stack boundaries; access granted.\n"); return 0; } }; #endif } return 0; } static inline reg_t validate_read_var(reg_t *r, reg_t *stack_base, int type, int max, int index, int line, reg_t default_value) { if (!validate_variable(r, stack_base, type, max, index, line)) return r[index]; else return default_value; } static inline void validate_write_var(reg_t *r, reg_t *stack_base, int type, int max, int index, int line, reg_t value) { if (!validate_variable(r, stack_base, type, max, index, line)) r[index] = value; } # define ASSERT_ARITHMETIC(v) validate_arithmetic(v) #else /*-- Non-validating alternatives -- */ # define validate_stack_addr(s, sp) sp # define validate_arithmetic(r) ((r).offset) # define signed_validate_arithmetic(r) ((int) ((r).offset)&0x8000 ? (signed) ((r).offset)-65536 : ((r).offset)) # define validate_variable(r, sb, t, m, i, l) # define validate_read_var(r, sb, t, m, i, l) ((r)[i]) # define validate_write_var(r, sb, t, m, i, l, v) ((r)[i] = (v)) # define validate_property(o, p) (&((o)->variables[p])) # define ASSERT_ARITHMETIC(v) (v).offset #endif #define READ_VAR(type, index, def) validate_read_var(variables[type], s->stack_base, type, variables_max[type], index, __LINE__, def) #define WRITE_VAR(type, index, value) validate_write_var(variables[type], s->stack_base, type, variables_max[type], index, __LINE__, value) #define WRITE_VAR16(type, index, value) WRITE_VAR(type, index, make_reg(0, value)); #define ACC_ARITHMETIC_L(op) make_reg(0, (op validate_arithmetic(s->r_acc))) #define ACC_AUX_LOAD() aux_acc = signed_validate_arithmetic(s->r_acc) #define ACC_AUX_STORE() s->r_acc = make_reg(0, aux_acc) #define OBJ_PROPERTY(o, p) (*validate_property(o, p)) /*==--------------------------==*/ int script_error(state_t *s, const char *file, int line, const char *reason) { sciprintf("Script error in file %s, line %d: %s\n", file, line, reason); script_debug_flag = script_error_flag = 1; return 0; } #define CORE_ERROR(area, msg) script_error(s, "[" area "] " __FILE__, __LINE__, msg) reg_t get_class_address(state_t *s, int classnr, int lock, reg_t caller) { class_t *the_class = s->classtable + classnr; if (NULL == s) { sciprintf("vm.c: get_class_address(): NULL passed for \"s\"\n"); return NULL_REG; } if (classnr < 0 || s->classtable_size <= classnr || the_class->script < 0) { sciprintf("[VM] Attempt to dereference class %x, which doesn't exist (max %x)\n", classnr, s->classtable_size); script_error_flag = script_debug_flag = 1; return NULL_REG; } else { if (!the_class->reg.segment) { script_get_segment(s, the_class->script, lock); if (!the_class->reg.segment) { sciprintf("[VM] Trying to instantiate class %x by instantiating script 0x%x (%03d) failed;" " Entering debugger.\n", classnr, the_class->script); script_error_flag = script_debug_flag = 1; return NULL_REG; } } else if (caller.segment != the_class->reg.segment) sm_increment_lockers(&s->seg_manager, the_class->reg.segment, SEG_ID); return the_class->reg; } } /* Operating on the stack */ /* 16 bit: */ #define PUSH(v) PUSH32(make_reg(0, v)) #define POP() (validate_arithmetic(POP32())) /* 32 bit: */ #define PUSH32(a) (*(validate_stack_addr(s, (xs->sp)++)) = (a)) #define POP32() (*(validate_stack_addr(s, --(xs->sp)))) /* Getting instruction parameters */ #define GET_OP_BYTE() ((guint8) code_buf[(xs->addr.pc.offset)++]) #define GET_OP_WORD() (getUInt16(code_buf + ((xs->addr.pc.offset) += 2) - 2)) #define GET_OP_FLEX() ((opcode & 1)? GET_OP_BYTE() : GET_OP_WORD()) #define GET_OP_SIGNED_BYTE() ((gint8)(code_buf[(xs->addr.pc.offset)++])) #define GET_OP_SIGNED_WORD() ((getInt16(code_buf + ((xs->addr.pc.offset) += 2) - 2))) #define GET_OP_SIGNED_FLEX() ((opcode & 1)? GET_OP_SIGNED_BYTE() : GET_OP_SIGNED_WORD()) #define SEG_GET_HEAP( s, reg ) sm_get_heap( &s->seg_manager, reg ) #define OBJ_SPECIES(s, reg) SEG_GET_HEAP(s, make_reg(reg.segment, reg.offset + SCRIPT_SPECIES_OFFSET)) /* Returns an object's species */ #define OBJ_SUPERCLASS(s, reg) SEG_GET_HEAP(s, make_reg(reg.segment, reg.offset + SCRIPT_SUPERCLASS_OFFSET)) /* Returns an object's superclass */ inline exec_stack_t * execute_method(state_t *s, word script, word pubfunct, stack_ptr_t sp, reg_t calling_obj, word argc, stack_ptr_t argp) { int seg; guint16 temp; if (!sm_script_is_loaded(&s->seg_manager, script, SCRIPT_ID)) /* Script not present yet? */ script_instantiate(s, script); else sm_unmark_script_deleted(&s->seg_manager, script); seg = sm_seg_get(&s->seg_manager, script); temp = sm_validate_export_func(&s->seg_manager, pubfunct, seg); VERIFY(temp, "Invalid pubfunct in export table"); if (!temp) { sciprintf("Request for invalid exported function 0x%x of script 0x%x\n", pubfunct, script); script_error_flag = script_debug_flag = 1; return NULL; } /* Check if a breakpoint is set on this method */ if (s->have_bp & BREAK_EXPORT) { breakpoint_t *bp; guint32 bpaddress; bpaddress = (script << 16 | pubfunct); bp = s->bp_list; while (bp) { if (bp->type == BREAK_EXPORT && bp->data.address == bpaddress) { sciprintf("Break on script %d, export %d\n", script, pubfunct); script_debug_flag = 1; bp_flag = 1; break; } bp = bp->next; } } return add_exec_stack_entry(s, make_reg(seg, temp), sp, calling_obj, argc, argp, -1, calling_obj, s->execution_stack_pos, seg); } static void _exec_varselectors(state_t *s) { /* Executes all varselector read/write ops on the TOS */ /* Now check the TOS to execute all varselector entries */ if (s->execution_stack_pos >= 0) while (s->execution_stack[s->execution_stack_pos].type == EXEC_STACK_TYPE_VARSELECTOR) { /* varselector access? */ if (s->execution_stack[s->execution_stack_pos].argc) { /* write? */ reg_t temp = s->execution_stack[s->execution_stack_pos].variables_argp[1]; *(s->execution_stack[s->execution_stack_pos].addr.varp) = temp; } else /* No, read */ s->r_acc = *(s->execution_stack[s->execution_stack_pos].addr.varp); --(s->execution_stack_pos); } } exec_stack_t * send_selector(state_t *s, reg_t send_obj, reg_t work_obj, stack_ptr_t sp, int framesize, stack_ptr_t argp) /* send_obj and work_obj are equal for anything but 'super' */ /* Returns a pointer to the TOS exec_stack element */ { #ifdef VM_DEBUG_SEND int i; #endif reg_t *varp; reg_t funcp; int selector; int argc; int origin = s->execution_stack_pos; /* Origin: Used for debugging */ exec_stack_t *retval = s->execution_stack + s->execution_stack_pos; int print_send_action = 0; /* We return a pointer to the new active exec_stack_t */ /* The selector calls we catch are stored below: */ int send_calls_nr = -1; if (NULL == s) { sciprintf("vm.c: exec_stack_t(): NULL passed for \"s\"\n"); return NULL; } while (framesize > 0) { selector = validate_arithmetic(*argp++); argc = validate_arithmetic(*argp); if (argc > 0x800) { /* More arguments than the stack could possibly accomodate for */ CORE_ERROR("SEND", "More than 0x800 arguments to function call\n"); return NULL; } /* Check if a breakpoint is set on this method */ if (s->have_bp & BREAK_SELECTOR) { breakpoint_t *bp; char method_name [256]; sprintf(method_name, "%s::%s", obj_get_name(s, send_obj), s->selector_names [selector]); bp = s->bp_list; while (bp) { int cmplen = strlen(bp->data.name); if (bp->data.name[cmplen - 1] != ':') cmplen = 256; if (bp->type == BREAK_SELECTOR && !strncmp(bp->data.name, method_name, cmplen)) { sciprintf("Break on %s (in ["PREG"])\n", method_name, PRINT_REG(send_obj)); script_debug_flag = print_send_action = 1; bp_flag = 1; break; } bp = bp->next; } } #ifdef VM_DEBUG_SEND sciprintf("Send to "PREG", selector %04x (%s):", PRINT_REG(send_obj), selector, s->selector_names[selector]); #endif /* VM_DEBUG_SEND */ if (++send_calls_nr == (send_calls_allocated - 1)) send_calls = (calls_struct_t*)sci_realloc(send_calls, sizeof(calls_struct_t) * (send_calls_allocated *= 2)); switch (lookup_selector(s, send_obj, selector, &varp, &funcp)) { case SELECTOR_NONE: sciprintf("Send to invalid selector 0x%x of object at "PREG"\n", 0xffff & selector, PRINT_REG(send_obj)); script_error_flag = script_debug_flag = 1; --send_calls_nr; break; case SELECTOR_VARIABLE: #ifdef VM_DEBUG_SEND sciprintf("Varselector: "); if (argc) sciprintf("Write "PREG"\n", PRINT_REG(argp[1])); else sciprintf("Read\n"); #endif /* VM_DEBUG_SEND */ switch (argc) { case 0: /* Read selector */ if (print_send_action) { sciprintf("[read selector]\n"); print_send_action = 0; } /* fallthrough */ case 1: #ifndef STRICT_SEND default: #endif { /* Argument is supplied -> Selector should be set */ if (print_send_action) { reg_t oldReg = *varp; reg_t newReg = argp[1]; sciprintf("[write to selector: change "PREG" to "PREG"]\n", PRINT_REG(oldReg), PRINT_REG(newReg)); print_send_action = 0; } send_calls[send_calls_nr].address.var = varp; /* register the call */ send_calls[send_calls_nr].argp = argp; send_calls[send_calls_nr].argc = argc; send_calls[send_calls_nr].selector = selector; send_calls[send_calls_nr].type = EXEC_STACK_TYPE_VARSELECTOR; /* Register as a varselector */ } break; #ifdef STRICT_SEND default: --send_calls_nr; sciprintf("Send error: Variable selector %04x in "PREG" called with %04x params\n", selector, PRINT_REG(send_obj), argc); script_debug_flag = 1; /* Enter debug mode */ _debug_seeking = _debug_step_running = 0; #endif } break; case SELECTOR_METHOD: #ifdef VM_DEBUG_SEND sciprintf("Funcselector("); for (i = 0; i < argc; i++) { sciprintf(PREG, PRINT_REG(argp[i+1])); if (i + 1 < argc) sciprintf(", "); } sciprintf(") at "PREG"\n", PRINT_REG(funcp)); #endif /* VM_DEBUG_SEND */ if (print_send_action) { sciprintf("[invoke selector]\n"); print_send_action = 0; } send_calls[send_calls_nr].address.func = funcp; /* register call */ send_calls[send_calls_nr].argp = argp; send_calls[send_calls_nr].argc = argc; send_calls[send_calls_nr].selector = selector; send_calls[send_calls_nr].type = EXEC_STACK_TYPE_CALL; send_calls[send_calls_nr].sp = sp; sp = CALL_SP_CARRY; /* Destroy sp, as it will be carried over */ break; } /* switch(lookup_selector()) */ framesize -= (2 + argc); argp += argc + 1; } /* Iterate over all registered calls in the reverse order. This way, the first call is ** placed on the TOS; as soon as it returns, it will cause the second call to be executed. */ for (; send_calls_nr >= 0; send_calls_nr--) if (send_calls[send_calls_nr].type == EXEC_STACK_TYPE_VARSELECTOR) /* Write/read variable? */ retval = add_exec_stack_varselector(s, work_obj, send_calls[send_calls_nr].argc, send_calls[send_calls_nr].argp, send_calls[send_calls_nr].selector, send_calls[send_calls_nr].address.var, origin); else retval = add_exec_stack_entry(s, send_calls[send_calls_nr].address.func, send_calls[send_calls_nr].sp, work_obj, send_calls[send_calls_nr].argc, send_calls[send_calls_nr].argp, send_calls[send_calls_nr].selector, send_obj, origin, SCI_XS_CALLEE_LOCALS); _exec_varselectors(s); retval = s->execution_stack + s->execution_stack_pos; return retval; } exec_stack_t * add_exec_stack_varselector(state_t *s, reg_t objp, int argc, stack_ptr_t argp, selector_t selector, reg_t *address, int origin) { exec_stack_t *xstack = add_exec_stack_entry(s, NULL_REG, address, objp, argc, argp, selector, objp, origin, SCI_XS_CALLEE_LOCALS); /* Store selector address in sp */ xstack->addr.varp = address; xstack->type = EXEC_STACK_TYPE_VARSELECTOR; return xstack; } exec_stack_t * add_exec_stack_entry(state_t *s, reg_t pc, stack_ptr_t sp, reg_t objp, int argc, stack_ptr_t argp, selector_t selector, reg_t sendp, int origin, seg_id_t locals_segment) /* Returns new TOS element for the execution stack*/ /* locals_segment may be -1 if derived from the called object */ { exec_stack_t *xstack = NULL; if (!s->execution_stack) s->execution_stack = (exec_stack_t*)sci_malloc(sizeof(exec_stack_t) * (s->execution_stack_size = 16)); if (++(s->execution_stack_pos) == s->execution_stack_size) /* Out of stack space? */ s->execution_stack = (exec_stack_t*)sci_realloc(s->execution_stack, sizeof(exec_stack_t) * (s->execution_stack_size += 8)); /* sciprintf("Exec stack: [%d/%d], origin %d, at %p\n", s->execution_stack_pos, s->execution_stack_size, origin, s->execution_stack); */ xstack = s->execution_stack + s->execution_stack_pos; xstack->objp = objp; if (locals_segment != SCI_XS_CALLEE_LOCALS) xstack->local_segment = locals_segment; else xstack->local_segment = pc.segment; xstack->sendp = sendp; xstack->addr.pc = pc; xstack->fp = xstack->sp = sp; xstack->argc = argc; xstack->variables_argp = argp; /* Parameters */ *argp = make_reg(0, argc); /* SCI code relies on the zeroeth argument to equal argc */ /* Additional debug information */ xstack->selector = selector; xstack->origin = origin; xstack->type = EXEC_STACK_TYPE_CALL; /* Normal call */ return xstack; } #ifdef DISABLE_VALIDATONS # define kernel_matches_signature(a, b, c, d) 1 #endif void vm_handle_fatal_error(state_t *s, int line, const char *file) { fprintf(stderr, "Fatal VM error in %s, L%d; aborting...\n", file, line); #ifdef HAVE_SETJMP_H if (jump_initialized) longjmp(vm_error_address, 0); #endif fprintf(stderr, "Could not recover, exitting...\n"); exit(1); } static inline script_t * script_locate_by_segment(state_t *s, seg_id_t seg) { mem_obj_t *memobj = GET_SEGMENT(s->seg_manager, seg, MEM_OBJ_SCRIPT); if (memobj) return &(memobj->data.script); return NULL; } static reg_t pointer_add(state_t *s, reg_t base, int offset) { mem_obj_t *mobj = GET_SEGMENT_ANY(s->seg_manager, base.segment); if (!mobj) { script_debug_flag = script_error_flag = 1; sciprintf("[VM] Error: Attempt to add %d to invalid pointer "PREG"!", offset, PRINT_REG(base)); return NULL_REG; } switch (mobj->type) { case MEM_OBJ_LOCALS: base.offset += 2 * offset; return base; case MEM_OBJ_SCRIPT: case MEM_OBJ_STACK: case MEM_OBJ_DYNMEM: base.offset += offset; return base; break; default: sciprintf("[VM] Error: Attempt to add %d to pointer "PREG": Pointer arithmetics of this type unsupported!", offset, PRINT_REG(base)); return NULL_REG; } } static inline void gc_countdown(state_t *s) { if (s->gc_countdown-- <= 0) { s->gc_countdown = script_gc_interval; run_gc(s); } } static byte _fake_return_buffer[2] = {op_ret << 1, op_ret << 1}; void run_vm(state_t *s, int restoring) { reg_t *variables[4]; /* global, local, temp, param, as immediate pointers */ reg_t *variables_base[4]; /* Used for referencing VM ops */ seg_id_t variables_seg[4]; /* Same as above, contains segment IDs */ #ifndef DISABLE_VALIDATIONS int variables_max[4]; /* Max. values for all variables */ unsigned int code_buf_size = 0 /* (Avoid spurious warning) */; #endif int temp; gint16 aux_acc; /* Auxiliary 16 bit accumulator */ reg_t r_temp; /* Temporary register */ stack_ptr_t s_temp; /* Temporary stack pointer */ gint16 opparams[4]; /* opcode parameters */ int restadjust = s->r_amp_rest; /* &rest adjusts the parameter count ** by this value */ /* Current execution data: */ exec_stack_t *xs = s->execution_stack + s->execution_stack_pos; exec_stack_t *xs_new = NULL /* (Avoid spurious warning) */; /* Used during some operations */ object_t *obj = obj_get(s, xs->objp); script_t *local_script = script_locate_by_segment(s, xs->local_segment); int old_execution_stack_base = s->execution_stack_base; /* Used to detect the ** stack bottom, for "physical" ** returns */ byte *code_buf = NULL /* (Avoid spurious warning) */; if (!local_script) { script_error(s, __FILE__, __LINE__, "Program Counter gone astray"); return; } if (NULL == s) { sciprintf("vm.c: run_vm(): NULL passed for \"s\"\n"); return; } #ifdef HAVE_SETJMP_H setjmp(vm_error_address); jump_initialized = 1; #endif if (!restoring) s->execution_stack_base = s->execution_stack_pos; #ifndef DISABLE_VALIDATIONS /* Initialize maximum variable count */ if (s->script_000->locals_block) variables_max[VAR_GLOBAL] = s->script_000->locals_block->nr; else variables_max[VAR_GLOBAL] = 0; #endif variables_seg[VAR_GLOBAL] = s->script_000->locals_segment; variables_seg[VAR_TEMP] = variables_seg[VAR_PARAM] = s->stack_segment; variables_base[VAR_TEMP] = variables_base[VAR_PARAM] = s->stack_base; /* SCI code reads the zeroeth argument to determine argc */ if (s->script_000->locals_block) variables_base[VAR_GLOBAL] = variables[VAR_GLOBAL] = s->script_000->locals_block->locals; else variables_base[VAR_GLOBAL] = variables[VAR_GLOBAL] = NULL; s->execution_stack_pos_changed = 1; /* Force initialization */ while (1) { byte opcode; int old_pc_offset; stack_ptr_t old_sp = xs->sp; byte opnumber; int var_type; /* See description below */ int var_number; old_pc_offset = xs->addr.pc.offset; if (s->execution_stack_pos_changed) { script_t *scr; xs = s->execution_stack + s->execution_stack_pos; s->execution_stack_pos_changed = 0; scr = script_locate_by_segment(s, xs->addr.pc.segment); if (!scr) { /* No script? Implicit return via fake instruction buffer */ warning("Running on non-existant script in segment %x!\n", xs->addr.pc.segment); code_buf = _fake_return_buffer; #ifndef DISABLE_VALIDATIONS code_buf_size = 2; #endif xs->addr.pc.offset = 1; scr = NULL; obj = NULL; } else { obj = obj_get(s, xs->objp); code_buf = scr->buf; #ifndef DISABLE_VALIDATIONS code_buf_size = scr->buf_size; #endif /* if (!obj) { SCIkdebug(SCIkWARNING, "Running with non-existant self= "PREG"\n", PRINT_REG(xs->objp)); }*/ local_script = script_locate_by_segment(s, xs->local_segment); if (!local_script) { warning("Could not find local script from segment %x", xs->local_segment); local_script = NULL; variables_base[VAR_LOCAL] = variables[VAR_LOCAL] = NULL; #ifndef DISABLE_VALIDATIONS variables_max[VAR_LOCAL] = 0; #endif } else { variables_seg[VAR_LOCAL] = local_script->locals_segment; if (local_script->locals_block) variables_base[VAR_LOCAL] = variables[VAR_LOCAL] = local_script->locals_block->locals; else variables_base[VAR_LOCAL] = variables[VAR_LOCAL] = NULL; #ifndef DISABLE_VALIDATIONS if (local_script->locals_block) variables_max[VAR_LOCAL] = local_script->locals_block->nr; else variables_max[VAR_LOCAL] = 0; variables_max[VAR_TEMP] = xs->sp - xs->fp; variables_max[VAR_PARAM] = xs->argc + 1; #endif } variables[VAR_TEMP] = xs->fp; variables[VAR_PARAM] = xs->variables_argp; } } script_error_flag = 0; /* Set error condition to false */ if (script_abort_flag) return; /* Emergency */ /* Debug if this has been requested: */ if (script_debug_flag || sci_debug_flags) { script_debug(s, &(xs->addr.pc), &(xs->sp), &(xs->fp), &(xs->objp), &restadjust, variables_seg, variables, variables_base, #ifdef DISABLE_VALIDATIONS NULL, #else variables_max, #endif bp_flag); bp_flag = 0; } #ifndef DISABLE_VALIDATIONS if (xs->sp < xs->fp) script_error(s, "[VM] "__FILE__, __LINE__, "Stack underflow"); variables_max[VAR_TEMP] = xs->sp - xs->fp; if (xs->addr.pc.offset >= code_buf_size) script_error(s, "[VM] "__FILE__, __LINE__, "Program Counter gone astray"); #endif opcode = GET_OP_BYTE(); /* Get opcode */ opnumber = opcode >> 1; for (temp = 0; formats[opnumber][temp]; temp++) /* formats comes from script.c */ switch (formats[opnumber][temp]) { case Script_Byte: opparams[temp] = GET_OP_BYTE(); break; case Script_SByte: opparams[temp] = GET_OP_SIGNED_BYTE(); break; case Script_Word: opparams[temp] = GET_OP_WORD(); break; case Script_SWord: opparams[temp] = GET_OP_SIGNED_WORD(); break; case Script_Variable: case Script_Property: case Script_Local: case Script_Temp: case Script_Global: case Script_Param: opparams[temp] = GET_OP_FLEX(); break; case Script_SVariable: case Script_SRelative: opparams[temp] = GET_OP_SIGNED_FLEX(); break; case Script_Offset: opparams[temp] = GET_OP_FLEX(); break; case Script_None: case Script_End: break; case Script_Invalid: default: sciprintf("opcode %02x: Invalid!", opcode); script_debug_flag = script_error_flag = 1; } // TODO: Replace the following by an opcode table, and several methods for // each opcode. switch (opnumber) { case 0x00: /* bnot */ s->r_acc = ACC_ARITHMETIC_L(0xffff ^ /*acc*/); break; case 0x01: /* add */ r_temp = POP32(); if (r_temp.segment || s->r_acc.segment) { reg_t r_ptr; int offset; /* Pointer arithmetics! */ if (s->r_acc.segment) { if (r_temp.segment) { sciprintf("Error: Attempt to add two pointers, stack="PREG" and acc="PREG"!\n", PRINT_REG(r_temp), PRINT_REG(s->r_acc)); script_debug_flag = script_error_flag = 1; offset = 0; } else { r_ptr = s->r_acc; offset = r_temp.offset; } } else { r_ptr = r_temp; offset = s->r_acc.offset; } s->r_acc = pointer_add(s, r_ptr, offset); } else s->r_acc = make_reg(0, r_temp.offset + s->r_acc.offset); break; case 0x02: /* sub */ r_temp = POP32(); if (r_temp.segment || s->r_acc.segment) { reg_t r_ptr; int offset; /* Pointer arithmetics! */ if (s->r_acc.segment) { if (r_temp.segment) { sciprintf("Error: Attempt to subtract two pointers, stack="PREG" and acc="PREG"!\n", PRINT_REG(r_temp), PRINT_REG(s->r_acc)); script_debug_flag = script_error_flag = 1; offset = 0; } else { r_ptr = s->r_acc; offset = r_temp.offset; } } else { r_ptr = r_temp; offset = s->r_acc.offset; } s->r_acc = pointer_add(s, r_ptr, -offset); } else s->r_acc = make_reg(0, r_temp.offset - s->r_acc.offset); break; case 0x03: /* mul */ s->r_acc = ACC_ARITHMETIC_L(((gint16)POP()) * (gint16)/*acc*/); break; case 0x04: /* div */ ACC_AUX_LOAD(); aux_acc = aux_acc != 0 ? ((gint16)POP()) / aux_acc : 0; ACC_AUX_STORE(); break; case 0x05: /* mod */ ACC_AUX_LOAD(); aux_acc = aux_acc != 0 ? ((gint16)POP()) % aux_acc : 0; ACC_AUX_STORE(); break; case 0x06: /* shr */ s->r_acc = ACC_ARITHMETIC_L(((guint16) POP()) >> /*acc*/); break; case 0x07: /* shl */ s->r_acc = ACC_ARITHMETIC_L(((guint16) POP()) << /*acc*/); break; case 0x08: /* xor */ s->r_acc = ACC_ARITHMETIC_L(POP() ^ /*acc*/); break; case 0x09: /* and */ s->r_acc = ACC_ARITHMETIC_L(POP() & /*acc*/); break; case 0x0a: /* or */ s->r_acc = ACC_ARITHMETIC_L(POP() | /*acc*/); break; case 0x0b: /* neg */ s->r_acc = ACC_ARITHMETIC_L(-/*acc*/); break; case 0x0c: /* not */ s->r_acc = make_reg(0, !(s->r_acc.offset || s->r_acc.segment)); /* Must allow pointers to be negated, as this is used for ** checking whether objects exist */ break; case 0x0d: /* eq? */ s->r_prev = s->r_acc; r_temp = POP32(); s->r_acc = make_reg(0, REG_EQ(r_temp, s->r_acc)); /* Explicitly allow pointers to be compared */ break; case 0x0e: /* ne? */ s->r_prev = s->r_acc; r_temp = POP32(); s->r_acc = make_reg(0, !REG_EQ(r_temp, s->r_acc)); /* Explicitly allow pointers to be compared */ break; case 0x0f: /* gt? */ s->r_prev = s->r_acc; s->r_acc = ACC_ARITHMETIC_L((gint16)POP() > (gint16)/*acc*/); break; case 0x10: /* ge? */ s->r_prev = s->r_acc; s->r_acc = ACC_ARITHMETIC_L((gint16)POP() >= (gint16)/*acc*/); break; case 0x11: /* lt? */ s->r_prev = s->r_acc; s->r_acc = ACC_ARITHMETIC_L((gint16)POP() < (gint16)/*acc*/); break; case 0x12: /* le? */ s->r_prev = s->r_acc; s->r_acc = ACC_ARITHMETIC_L((gint16)POP() <= (gint16)/*acc*/); break; case 0x13: /* ugt? */ s->r_prev = s->r_acc; r_temp = POP32(); s->r_acc = make_reg(0, (r_temp.segment == s->r_acc.segment) && r_temp.offset > s->r_acc.offset); break; case 0x14: /* uge? */ s->r_prev = s->r_acc; r_temp = POP32(); s->r_acc = make_reg(0, (r_temp.segment == s->r_acc.segment) && r_temp.offset >= s->r_acc.offset); break; case 0x15: /* ult? */ s->r_prev = s->r_acc; r_temp = POP32(); s->r_acc = make_reg(0, (r_temp.segment == s->r_acc.segment) && r_temp.offset < s->r_acc.offset); break; case 0x16: /* ule? */ s->r_prev = s->r_acc; r_temp = POP32(); s->r_acc = make_reg(0, (r_temp.segment == s->r_acc.segment) && r_temp.offset <= s->r_acc.offset); break; case 0x17: /* bt */ if (s->r_acc.offset || s->r_acc.segment) xs->addr.pc.offset += opparams[0]; break; case 0x18: /* bnt */ if (!(s->r_acc.offset || s->r_acc.segment)) xs->addr.pc.offset += opparams[0]; break; case 0x19: /* jmp */ xs->addr.pc.offset += opparams[0]; break; case 0x1a: /* ldi */ s->r_acc = make_reg(0, opparams[0]); break; case 0x1b: /* push */ PUSH32(s->r_acc); break; case 0x1c: /* pushi */ PUSH(opparams[0]); break; case 0x1d: /* toss */ xs->sp--; break; case 0x1e: /* dup */ r_temp = xs->sp[-1]; PUSH32(r_temp); break; case 0x1f: { /* link */ int i; for (i = 0; i < opparams[0]; i++) xs->sp[i] = NULL_REG; xs->sp += opparams[0]; break; } case 0x20: { /* call */ int argc = (opparams[1] >> 1) /* Given as offset, but we need count */ + 1 + restadjust; stack_ptr_t call_base = xs->sp - argc; xs->sp[1].offset += restadjust; xs_new = add_exec_stack_entry(s, make_reg(xs->addr.pc.segment, xs->addr.pc.offset + opparams[0]), xs->sp, xs->objp, (validate_arithmetic(*call_base)) + restadjust, call_base, NULL_SELECTOR, xs->objp, s->execution_stack_pos, xs->local_segment); restadjust = 0; /* Used up the &rest adjustment */ xs->sp = call_base; s->execution_stack_pos_changed = 1; break; } case 0x21: /* callk */ gc_countdown(s); xs->sp -= (opparams[1] >> 1) + 1; if (s->version >= SCI_VERSION_FTU_NEW_SCRIPT_HEADER) { xs->sp -= restadjust; s->r_amp_rest = 0; /* We just used up the restadjust, remember? */ } if (opparams[0] >= s->kfunct_nr) { sciprintf("Invalid kernel function 0x%x requested\n", opparams[0]); script_debug_flag = script_error_flag = 1; } else { int argc = ASSERT_ARITHMETIC(xs->sp[0]); if (s->version >= SCI_VERSION_FTU_NEW_SCRIPT_HEADER) argc += restadjust; if (s->kfunct_table[opparams[0]].signature && !kernel_matches_signature(s, s->kfunct_table[opparams[0]] .signature, argc, xs->sp + 1)) { sciprintf("[VM] Invalid arguments to kernel call %x\n", opparams[0]); script_debug_flag = script_error_flag = 1; } else { s->r_acc = s->kfunct_table[opparams[0]] .fun(s, opparams[0], argc, xs->sp + 1); } /* Call kernel function */ /* Calculate xs again: The kernel function might ** have spawned a new VM */ xs_new = s->execution_stack + s->execution_stack_pos; s->execution_stack_pos_changed = 1; if (s->version >= SCI_VERSION_FTU_NEW_SCRIPT_HEADER) restadjust = s->r_amp_rest; } break; case 0x22: /* callb */ temp = ((opparams[1] >> 1) + restadjust + 1); s_temp = xs->sp; xs->sp -= temp; xs->sp[0].offset += restadjust; xs_new = execute_method(s, 0, opparams[0], s_temp, xs->objp, xs->sp[0].offset, xs->sp); restadjust = 0; /* Used up the &rest adjustment */ if (xs_new) /* in case of error, keep old stack */ s->execution_stack_pos_changed = 1; break; case 0x23: /* calle */ temp = ((opparams[2] >> 1) + restadjust + 1); s_temp = xs->sp; xs->sp -= temp; xs->sp[0].offset += restadjust; xs_new = execute_method(s, opparams[0], opparams[1], s_temp, xs->objp, xs->sp[0].offset, xs->sp); restadjust = 0; /* Used up the &rest adjustment */ if (xs_new) /* in case of error, keep old stack */ s->execution_stack_pos_changed = 1; break; case 0x24: /* ret */ do { stack_ptr_t old_sp = xs->sp; stack_ptr_t old_fp = xs->fp; exec_stack_t *old_xs = s->execution_stack + s->execution_stack_pos; if (s->execution_stack_pos == s->execution_stack_base) { /* Have we reached the base? */ s->execution_stack_base = old_execution_stack_base; /* Restore stack base */ --(s->execution_stack_pos); s->execution_stack_pos_changed = 1; s->r_amp_rest = restadjust; /* Update &rest */ return; /* "Hard" return */ } if (old_xs->type == EXEC_STACK_TYPE_VARSELECTOR) { /* varselector access? */ if (old_xs->argc) /* write? */ *(old_xs->addr.varp) = old_xs->variables_argp[1]; else /* No, read */ s->r_acc = *(old_xs->addr.varp); } /* Not reached the base, so let's do a soft return */ --(s->execution_stack_pos); xs = old_xs - 1; s->execution_stack_pos_changed = 1; xs = s->execution_stack + s->execution_stack_pos; if (xs->sp == CALL_SP_CARRY /* Used in sends to 'carry' the stack pointer */ || xs->type != EXEC_STACK_TYPE_CALL) { xs->sp = old_sp; xs->fp = old_fp; } } while (xs->type == EXEC_STACK_TYPE_VARSELECTOR); /* Iterate over all varselector accesses */ s->execution_stack_pos_changed = 1; xs_new = xs; break; case 0x25: /* send */ s_temp = xs->sp; xs->sp -= ((opparams[0] >> 1) + restadjust); /* Adjust stack */ xs->sp[1].offset += restadjust; xs_new = send_selector(s, s->r_acc, s->r_acc, s_temp, (int)(opparams[0] >> 1) + (word)restadjust, xs->sp); if (xs_new && xs_new != xs) s->execution_stack_pos_changed = 1; restadjust = 0; break; case 0x28: /* class */ s->r_acc = get_class_address(s, (unsigned) opparams[0], SCRIPT_GET_LOCK, xs->addr.pc); break; case 0x2a: /* self */ s_temp = xs->sp; xs->sp -= ((opparams[0] >> 1) + restadjust); /* Adjust stack */ xs->sp[1].offset += restadjust; xs_new = send_selector(s, xs->objp, xs->objp, s_temp, (int)(opparams[0] >> 1) + (word)restadjust, xs->sp); if (xs_new && xs_new != xs) s->execution_stack_pos_changed = 1; restadjust = 0; break; case 0x2b: /* super */ r_temp = get_class_address(s, opparams[0], SCRIPT_GET_LOAD, xs->addr.pc); if (!r_temp.segment) CORE_ERROR("VM", "Invalid superclass in object"); else { s_temp = xs->sp; xs->sp -= ((opparams[1] >> 1) + restadjust); /* Adjust stack */ xs->sp[1].offset += restadjust; xs_new = send_selector(s, r_temp, xs->objp, s_temp, (int)(opparams[1] >> 1) + (word)restadjust, xs->sp); if (xs_new && xs_new != xs) s->execution_stack_pos_changed = 1; restadjust = 0; } break; case 0x2c: /* &rest */ temp = (guint16) opparams[0]; /* First argument */ restadjust = xs->argc - temp + 1; /* +1 because temp counts the paramcount while argc doesn't */ if (restadjust < 0) restadjust = 0; for (; temp <= xs->argc; temp++) PUSH32(xs->variables_argp[temp]); break; case 0x2d: /* lea */ temp = (guint16) opparams[0] >> 1; var_number = temp & 0x03; /* Get variable type */ /* Get variable block offset */ r_temp.segment = variables_seg[var_number]; r_temp.offset = variables[var_number] - variables_base[var_number]; if (temp & 0x08) /* Add accumulator offset if requested */ r_temp.offset += signed_validate_arithmetic(s->r_acc); r_temp.offset += opparams[1]; /* Add index */ r_temp.offset *= sizeof(reg_t); /* That's the immediate address now */ s->r_acc = r_temp; break; case 0x2e: /* selfID */ s->r_acc = xs->objp; break; case 0x30: /* pprev */ PUSH32(s->r_prev); break; case 0x31: /* pToa */ s->r_acc = OBJ_PROPERTY(obj, (opparams[0] >> 1)); break; case 0x32: /* aTop */ OBJ_PROPERTY(obj, (opparams[0] >> 1)) = s->r_acc; break; case 0x33: /* pTos */ PUSH32(OBJ_PROPERTY(obj, opparams[0] >> 1)); break; case 0x34: /* sTop */ OBJ_PROPERTY(obj, (opparams[0] >> 1)) = POP32(); break; case 0x35: /* ipToa */ s->r_acc = OBJ_PROPERTY(obj, (opparams[0] >> 1)); s->r_acc = OBJ_PROPERTY(obj, (opparams[0] >> 1)) = ACC_ARITHMETIC_L(1 + /*acc*/); break; case 0x36: /* dpToa */ s->r_acc = OBJ_PROPERTY(obj, (opparams[0] >> 1)); s->r_acc = OBJ_PROPERTY(obj, (opparams[0] >> 1)) = ACC_ARITHMETIC_L(-1 + /*acc*/); break; case 0x37: /* ipTos */ ASSERT_ARITHMETIC(OBJ_PROPERTY(obj, (opparams[0] >> 1))); temp = ++OBJ_PROPERTY(obj, (opparams[0] >> 1)).offset; PUSH(temp); break; case 0x38: /* dpTos */ ASSERT_ARITHMETIC(OBJ_PROPERTY(obj, (opparams[0] >> 1))); temp = --OBJ_PROPERTY(obj, (opparams[0] >> 1)).offset; PUSH(temp); break; case 0x39: /* lofsa */ s->r_acc.segment = xs->addr.pc.segment; if (s->version >= SCI_VERSION(1, 001, 000)) s->r_acc.offset = opparams[0] + local_script->script_size; else if (s->version >= SCI_VERSION_FTU_LOFS_ABSOLUTE) s->r_acc.offset = opparams[0]; else s->r_acc.offset = xs->addr.pc.offset + opparams[0]; #ifndef DISABLE_VALIDATIONS if (s->r_acc.offset >= code_buf_size) { sciprintf("VM: lofsa operation overflowed: "PREG" beyond end" " of script (at %04x)\n", PRINT_REG(s->r_acc), code_buf_size); script_error_flag = script_debug_flag = 1; } #endif break; case 0x3a: /* lofss */ r_temp.segment = xs->addr.pc.segment; if (s->version >= SCI_VERSION_FTU_LOFS_ABSOLUTE) r_temp.offset = opparams[0]; else r_temp.offset = xs->addr.pc.offset + opparams[0]; #ifndef DISABLE_VALIDATIONS if (r_temp.offset >= code_buf_size) { sciprintf("VM: lofss operation overflowed: "PREG" beyond end" " of script (at %04x)\n", PRINT_REG(r_temp), code_buf_size); script_error_flag = script_debug_flag = 1; } #endif PUSH32(r_temp); break; case 0x3b: /* push0 */ PUSH(0); break; case 0x3c: /* push1 */ PUSH(1); break; case 0x3d: /* push2 */ PUSH(2); break; case 0x3e: /* pushSelf */ PUSH32(xs->objp); break; case 0x40: /* lag */ case 0x41: /* lal */ case 0x42: /* lat */ case 0x43: /* lap */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0]; s->r_acc = READ_VAR(var_type, var_number, s->r_acc); break; case 0x44: /* lsg */ case 0x45: /* lsl */ case 0x46: /* lst */ case 0x47: /* lsp */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0]; PUSH32(READ_VAR(var_type, var_number, s->r_acc)); break; case 0x48: /* lagi */ case 0x49: /* lali */ case 0x4a: /* lati */ case 0x4b: /* lapi */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0] + signed_validate_arithmetic(s->r_acc); s->r_acc = READ_VAR(var_type, var_number, s->r_acc); break; case 0x4c: /* lsgi */ case 0x4d: /* lsli */ case 0x4e: /* lsti */ case 0x4f: /* lspi */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0] + signed_validate_arithmetic(s->r_acc); PUSH32(READ_VAR(var_type, var_number, s->r_acc)); break; case 0x50: /* sag */ case 0x51: /* sal */ case 0x52: /* sat */ case 0x53: /* sap */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0]; WRITE_VAR(var_type, var_number, s->r_acc); break; case 0x54: /* ssg */ case 0x55: /* ssl */ case 0x56: /* sst */ case 0x57: /* ssp */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0]; WRITE_VAR(var_type, var_number, POP32()); break; case 0x58: /* sagi */ case 0x59: /* sali */ case 0x5a: /* sati */ case 0x5b: /* sapi */ /* Special semantics because it wouldn't really make a whole lot ** of sense otherwise, with acc being used for two things ** simultaneously... */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0] + signed_validate_arithmetic(s->r_acc); WRITE_VAR(var_type, var_number, s->r_acc = POP32()); break; case 0x5c: /* ssgi */ case 0x5d: /* ssli */ case 0x5e: /* ssti */ case 0x5f: /* sspi */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0] + signed_validate_arithmetic(s->r_acc); WRITE_VAR(var_type, var_number, POP32()); break; case 0x60: /* +ag */ case 0x61: /* +al */ case 0x62: /* +at */ case 0x63: /* +ap */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0]; s->r_acc = make_reg(0, 1 + validate_arithmetic(READ_VAR(var_type, var_number, s->r_acc))); WRITE_VAR(var_type, var_number, s->r_acc); break; case 0x64: /* +sg */ case 0x65: /* +sl */ case 0x66: /* +st */ case 0x67: /* +sp */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0]; r_temp = make_reg(0, 1 + validate_arithmetic(READ_VAR(var_type, var_number, s->r_acc))); PUSH32(r_temp); WRITE_VAR(var_type, var_number, r_temp); break; case 0x68: /* +agi */ case 0x69: /* +ali */ case 0x6a: /* +ati */ case 0x6b: /* +api */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0] + signed_validate_arithmetic(s->r_acc); s->r_acc = make_reg(0, 1 + validate_arithmetic(READ_VAR(var_type, var_number, s->r_acc))); WRITE_VAR(var_type, var_number, s->r_acc); break; case 0x6c: /* +sgi */ case 0x6d: /* +sli */ case 0x6e: /* +sti */ case 0x6f: /* +spi */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0] + signed_validate_arithmetic(s->r_acc); r_temp = make_reg(0, 1 + validate_arithmetic(READ_VAR(var_type, var_number, s->r_acc))); PUSH32(r_temp); WRITE_VAR(var_type, var_number, r_temp); break; case 0x70: /* -ag */ case 0x71: /* -al */ case 0x72: /* -at */ case 0x73: /* -ap */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0]; s->r_acc = make_reg(0, -1 + validate_arithmetic(READ_VAR(var_type, var_number, s->r_acc))); WRITE_VAR(var_type, var_number, s->r_acc); break; case 0x74: /* -sg */ case 0x75: /* -sl */ case 0x76: /* -st */ case 0x77: /* -sp */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0]; r_temp = make_reg(0, -1 + validate_arithmetic(READ_VAR(var_type, var_number, s->r_acc))); PUSH32(r_temp); WRITE_VAR(var_type, var_number, r_temp); break; case 0x78: /* -agi */ case 0x79: /* -ali */ case 0x7a: /* -ati */ case 0x7b: /* -api */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0] + signed_validate_arithmetic(s->r_acc); s->r_acc = make_reg(0, -1 + validate_arithmetic(READ_VAR(var_type, var_number, s->r_acc))); WRITE_VAR(var_type, var_number, s->r_acc); break; case 0x7c: /* -sgi */ case 0x7d: /* -sli */ case 0x7e: /* -sti */ case 0x7f: /* -spi */ var_type = (opcode >> 1) & 0x3; /* Gets the variable type: g, l, t or p */ var_number = opparams[0] + signed_validate_arithmetic(s->r_acc); r_temp = make_reg(0, -1 + validate_arithmetic(READ_VAR(var_type, var_number, s->r_acc))); PUSH32(r_temp); WRITE_VAR(var_type, var_number, r_temp); break; default: script_error(s, __FILE__, __LINE__, "Illegal opcode"); } /* switch(opcode >> 1) */ if (s->execution_stack_pos_changed) /* Force initialization */ xs = xs_new; #ifndef DISABLE_VALIDATIONS if (xs != s->execution_stack + s->execution_stack_pos) { sciprintf("Error: xs is stale (%d vs %d); last command was %02x\n", xs - s->execution_stack, s->execution_stack_pos, opnumber); } #endif if (script_error_flag) { _debug_step_running = 0; /* Stop multiple execution */ _debug_seeking = 0; /* Stop special seeks */ xs->addr.pc.offset = old_pc_offset; xs->sp = old_sp; } else ++script_step_counter; } } static inline int _obj_locate_varselector(state_t *s, object_t *obj, selector_t slc) { /* Determines if obj explicitly defines slc as a varselector */ /* Returns -1 if not found */ if (s->version < SCI_VERSION(1, 001, 000)) { int varnum = obj->variable_names_nr; int selector_name_offset = varnum * 2 + SCRIPT_SELECTOR_OFFSET; int i; byte *buf = obj->base_obj + selector_name_offset; obj->base_vars = (guint16 *) buf; for (i = 0; i < varnum; i++) if (getUInt16(buf + (i << 1)) == slc) /* Found it? */ return i; /* report success */ return -1; /* Failed */ } else { byte *buf = (byte *) obj->base_vars; int i; int varnum = obj->variables[1].offset; if (!(obj->variables[SCRIPT_INFO_SELECTOR].offset & SCRIPT_INFO_CLASS)) buf = ((byte *) obj_get(s, obj->variables[SCRIPT_SUPERCLASS_SELECTOR])->base_vars); for (i = 0; i < varnum; i++) if (getUInt16(buf + (i << 1)) == slc) /* Found it? */ return i; /* report success */ return -1; /* Failed */ } } static inline int _class_locate_funcselector(state_t *s, object_t *obj, selector_t slc) { /* Determines if obj is a class and explicitly defines slc as a funcselector */ /* Does NOT say anything about obj's superclasses, i.e. failure may be ** returned even if one of the superclasses defines the funcselector. */ int funcnum = obj->methods_nr; int i; for (i = 0; i < funcnum; i++) if (VM_OBJECT_GET_FUNCSELECTOR(obj, i) == slc) /* Found it? */ return i; /* report success */ return -1; /* Failed */ } static inline int _lookup_selector_function(state_t *s, int seg_id, object_t *obj, selector_t selector_id, reg_t *fptr) { int index; /* "recursive" lookup */ while (obj) { index = _class_locate_funcselector(s, obj, selector_id); if (index >= 0) { if (fptr) { if (s->version < SCI_VERSION(1, 001, 000)) *fptr = make_reg(obj->pos.segment, getUInt16((byte *) (obj->base_method + index + obj->methods_nr + 1))); else *fptr = make_reg(obj->pos.segment, getUInt16((byte *) (obj->base_method + index * 2 + 2))); } return SELECTOR_METHOD; } else { seg_id = obj->variables[SCRIPT_SUPERCLASS_SELECTOR].segment; obj = obj_get(s, obj->variables[SCRIPT_SUPERCLASS_SELECTOR]); } } return SELECTOR_NONE; } int lookup_selector(state_t *s, reg_t obj_location, selector_t selector_id, reg_t **vptr, reg_t *fptr) { object_t *obj = obj_get(s, obj_location); object_t *species; int index; /* Early SCI versions used the LSB in the selector ID as a read/write ** toggle, meaning that we must remove it for selector lookup. */ if (s->version < SCI_VERSION_FTU_NEW_SCRIPT_HEADER) selector_id &= ~1; if (!obj) { CORE_ERROR("SLC-LU", "Attempt to send to non-object or invalid script"); sciprintf("Address was "PREG"\n", PRINT_REG(obj_location)); return SELECTOR_NONE; } if (IS_CLASS(obj)) species = obj; else species = obj_get(s, obj->variables[SCRIPT_SPECIES_SELECTOR]); if (!obj) { CORE_ERROR("SLC-LU", "Error while looking up Species class"); sciprintf("Original address was "PREG"\n", PRINT_REG(obj_location)); sciprintf("Species address was "PREG"\n", PRINT_REG(obj->variables[SCRIPT_SPECIES_SELECTOR])); return SELECTOR_NONE; } index = _obj_locate_varselector(s, obj, selector_id); if (index >= 0) { /* Found it as a variable */ if (vptr) *vptr = obj->variables + index; return SELECTOR_VARIABLE; } return _lookup_selector_function(s, obj_location.segment, obj, selector_id, fptr); } /* Detects SCI versions by their different script header */ void script_detect_versions(state_t *s) { int c; resource_t *script = {0}; if (scir_find_resource(s->resmgr, sci_heap, 0, 0)) { version_require_later_than(s, SCI_VERSION(1, 001, 000)); return; } for (c = 0; c < 1000; c++) { if ((script = scir_find_resource(s->resmgr, sci_script, c, 0))) { int id = getInt16(script->data); if (id > 15) { version_require_earlier_than(s, SCI_VERSION_FTU_NEW_SCRIPT_HEADER); return; } } } } seg_id_t script_get_segment(state_t *s, int script_nr, int load) { seg_id_t segment; if ((load & SCRIPT_GET_LOAD) == SCRIPT_GET_LOAD) script_instantiate(s, script_nr); segment = sm_seg_get(&s->seg_manager, script_nr); if (segment > 0) { if ((load & SCRIPT_GET_LOCK) == SCRIPT_GET_LOCK) sm_increment_lockers(&s->seg_manager, segment, SEG_ID); return segment; } else return 0; } reg_t script_lookup_export(state_t *s, int script_nr, int export_index) { seg_id_t seg = script_get_segment(s, script_nr, SCRIPT_GET_DONT_LOAD); mem_obj_t *memobj; script_t *script = NULL; #ifndef DISABLE_VALIDATIONS if (!seg) { CORE_ERROR("EXPORTS", "Script invalid or not loaded"); sciprintf("Script was script.03d (0x%x)\n", script_nr, script_nr); return NULL_REG; } #endif memobj = GET_SEGMENT(s->seg_manager, seg, MEM_OBJ_SCRIPT); if (memobj) script = &(memobj->data.script); #ifndef DISABLE_VALIDATIONS if (script && export_index < script->exports_nr && export_index >= 0) #endif return make_reg(seg, getUInt16((byte *)(script->export_table + export_index))); #ifndef DISABLE_VALIDATIONS else { CORE_ERROR("EXPORTS", "Export invalid or script missing "); if (!script) sciprintf("(script.%03d missing)\n", script_nr); else sciprintf("(script.%03d: Sought export %d/%d)\n", script_nr, export_index, script->exports_nr); return NULL_REG; } #endif } #define INST_LOOKUP_CLASS(id) ((id == 0xffff)? NULL_REG : get_class_address(s, id, SCRIPT_GET_LOCK, reg)) int sm_script_marked_deleted(seg_manager_t* self, int script_nr); int sm_initialise_script(mem_obj_t *mem, struct _state *s, int script_nr); int script_instantiate_common(state_t *s, int script_nr, resource_t **script, resource_t **heap, int *was_new) { int seg; int seg_id; int marked_for_deletion; mem_obj_t *mem; reg_t reg; *was_new = 1; *script = scir_find_resource(s->resmgr, sci_script, script_nr, 0); if (s->version >= SCI_VERSION(1, 001, 000)) *heap = scir_find_resource(s->resmgr, sci_heap, script_nr, 0); if (!*script || (s->version >= SCI_VERSION(1, 001, 000) && !heap)) { sciprintf("Script 0x%x requested but not found\n", script_nr); /* script_debug_flag = script_error_flag = 1; */ if (s->version >= SCI_VERSION(1, 001, 000)) { if (*heap) sciprintf("Inconsistency: heap resource WAS found\n"); else if (*script) sciprintf("Inconsistency: script resource WAS found\n"); } return 0; } if (NULL == s) { sciprintf("vm.c: script_instantiate(): NULL passed for \"s\"\n"); return 0; } seg = sm_seg_get(&s->seg_manager, script_nr); if (sm_script_is_loaded(&s->seg_manager, script_nr, SCRIPT_ID)) { marked_for_deletion = sm_script_marked_deleted(&s->seg_manager, script_nr); if (!marked_for_deletion) { sm_increment_lockers(&s->seg_manager, seg, SEG_ID); return seg; } else { seg_id = seg; mem = s->seg_manager.heap[seg]; sm_free_script(mem); } } else if (!(mem = sm_allocate_script(&s->seg_manager, s, script_nr, &seg_id))) { /* ALL YOUR SCRIPT BASE ARE BELONG TO US */ sciprintf("Not enough heap space for script size 0x%x of script 0x%x," " should this happen?`\n", (*script)->size, script_nr); script_debug_flag = script_error_flag = 1; return 0; } sm_initialise_script(mem, s, script_nr); reg.segment = seg_id; reg.offset = 0; /* Set heap position (beyond the size word) */ sm_set_lockers(&s->seg_manager, 1, reg.segment, SEG_ID); sm_set_export_table_offset(&s->seg_manager, 0, reg.segment, SEG_ID); sm_set_synonyms_offset(&s->seg_manager, 0, reg.segment, SEG_ID); sm_set_synonyms_nr(&s->seg_manager, 0, reg.segment, SEG_ID); *was_new = 0; return seg_id; } int script_instantiate_sci0(state_t *s, int script_nr) { int objtype; unsigned int objlength; reg_t reg, reg_tmp; int seg_id; int relocation = -1; int magic_pos_adder; /* Usually 0; 2 for older SCI versions */ resource_t *script; int was_new; seg_id = script_instantiate_common(s, script_nr, &script, NULL, &was_new); if (was_new) return seg_id; reg.segment = seg_id; reg.offset = 0; if (s->version < SCI_VERSION_FTU_NEW_SCRIPT_HEADER) { /* int locals_size = getUInt16(script->data)*2; int locals = (locals_size)? script->size : 0; */ int locals_nr = getUInt16(script->data); /* Old script block */ /* There won't be a localvar block in this case */ /* Instead, the script starts with a 16 bit int specifying the ** number of locals we need; these are then allocated and zeroed. */ sm_mcpy_in_out(&s->seg_manager, 0, script->data, script->size, reg.segment, SEG_ID); magic_pos_adder = 2; /* Step over the funny prefix */ if (locals_nr) sm_script_initialise_locals_zero(&s->seg_manager, reg.segment, locals_nr); } else { sm_mcpy_in_out(&s->seg_manager, 0, script->data, script->size, reg.segment, SEG_ID); magic_pos_adder = 0; } /* Now do a first pass through the script objects to find the ** export table and local variable block */ objlength = 0; reg_tmp = reg; reg.offset = magic_pos_adder; do { reg_t data_base; reg_t addr; reg.offset += objlength; /* Step over the last checked object */ objtype = SEG_GET_HEAP(s, reg); if (!objtype) break; objlength = SEG_GET_HEAP(s, make_reg(reg.segment, reg.offset + 2)); data_base = reg; data_base.offset += 4; addr = data_base; switch (objtype) { case sci_obj_exports: { sm_set_export_table_offset(&s->seg_manager, data_base.offset, reg.segment, SEG_ID); } break; case sci_obj_synonyms: sm_set_synonyms_offset(&s->seg_manager, addr.offset, reg.segment, SEG_ID); /* +4 is to step over the header */ sm_set_synonyms_nr(&s->seg_manager, (objlength) / 4, reg.segment, SEG_ID); break; case sci_obj_localvars: sm_script_initialise_locals(&s->seg_manager, data_base); break; case sci_obj_class: { int classpos = addr.offset - SCRIPT_OBJECT_MAGIC_OFFSET; int species; reg_tmp.offset = addr.offset - SCRIPT_OBJECT_MAGIC_OFFSET; species = OBJ_SPECIES(s, reg_tmp); if (species < 0 || species >= s->classtable_size) { sciprintf("Invalid species %d(0x%x) not in interval " "[0,%d) while instantiating script %d\n", species, species, s->classtable_size, script_nr); script_debug_flag = script_error_flag = 1; return 1; } s->classtable[species].script = script_nr; s->classtable[species].reg = addr; s->classtable[species].reg.offset = classpos; /* Set technical class position-- into the block allocated for it */ } break; default: break; } } while (objtype != 0); /* And now a second pass to adjust objects and class pointers, and the general pointers */ objlength = 0; reg.offset = magic_pos_adder; /* Reset counter */ do { reg_t addr; reg.offset += objlength; /* Step over the last checked object */ objtype = SEG_GET_HEAP(s, reg); if (!objtype) break; objlength = SEG_GET_HEAP(s, make_reg(reg.segment, reg.offset + 2)); reg.offset += 4; /* Step over header */ addr = reg; switch (objtype) { case sci_obj_code: sm_script_add_code_block(&s->seg_manager, addr); break; case sci_obj_object: case sci_obj_class: { /* object or class? */ object_t *obj = sm_script_obj_init(&s->seg_manager, s, addr); object_t *base_obj; /* Instantiate the superclass, if neccessary */ obj->variables[SCRIPT_SPECIES_SELECTOR] = INST_LOOKUP_CLASS(obj->variables[SCRIPT_SPECIES_SELECTOR].offset); base_obj = obj_get(s, obj->variables[SCRIPT_SPECIES_SELECTOR]); obj->variable_names_nr = base_obj->variables_nr; obj->base_obj = base_obj->base_obj; /* Copy base from species class, as we need its selector IDs */ obj->variables[SCRIPT_SUPERCLASS_SELECTOR] = INST_LOOKUP_CLASS(obj->variables[SCRIPT_SUPERCLASS_SELECTOR].offset); } /* if object or class */ break; case sci_obj_pointers: /* A relocation table */ relocation = addr.offset; break; default: break; } reg.offset -= 4; /* Step back on header */ } while ((objtype != 0) && (((unsigned)reg.offset) < script->size - 2)); if (relocation >= 0) sm_script_relocate(&s->seg_manager, make_reg(reg.segment, relocation)); sm_script_free_unused_objects(&s->seg_manager, reg.segment); return reg.segment; /* instantiation successful */ } void sm_script_relocate_exports_sci11(seg_manager_t *self, int seg); void sm_script_initialise_objects_sci11(seg_manager_t *self, state_t *s, int seg); void sm_heap_relocate(seg_manager_t *self, state_t *s, reg_t block); int script_instantiate_sci11(state_t *s, int script_nr) { resource_t *script, *heap; int seg_id; int heap_start; reg_t reg; int was_new; seg_id = script_instantiate_common(s, script_nr, &script, &heap, &was_new); if (was_new) return seg_id; heap_start = script->size; if (script->size & 2) heap_start ++; sm_mcpy_in_out(&s->seg_manager, 0, script->data, script->size, seg_id, SEG_ID); sm_mcpy_in_out(&s->seg_manager, heap_start, heap->data, heap->size, seg_id, SEG_ID); if (getUInt16(script->data + 6) > 0) sm_set_export_table_offset(&s->seg_manager, 6, seg_id, SEG_ID); reg.segment = seg_id; reg.offset = heap_start + 4; sm_script_initialise_locals(&s->seg_manager, reg); sm_script_relocate_exports_sci11(&s->seg_manager, seg_id); sm_script_initialise_objects_sci11(&s->seg_manager, s, seg_id); reg.offset = getUInt16(heap->data); sm_heap_relocate(&s->seg_manager, s, reg); return seg_id; } int script_instantiate(state_t *s, int script_nr) { if (s->version >= SCI_VERSION(1, 001, 000)) return script_instantiate_sci11(s, script_nr); else return script_instantiate_sci0(s, script_nr); } void sm_mark_script_deleted(seg_manager_t* self, int script_nr); void script_uninstantiate_sci0(state_t *s, int script_nr, seg_id_t seg) { reg_t reg = make_reg(seg, (s->version < SCI_VERSION_FTU_NEW_SCRIPT_HEADER) ? 2 : 0); int objtype, objlength; /* Make a pass over the object in order uninstantiate all superclasses */ objlength = 0; do { reg.offset += objlength; /* Step over the last checked object */ objtype = SEG_GET_HEAP(s, reg); if (!objtype) break; objlength = SEG_GET_HEAP(s, make_reg(reg.segment, reg.offset + 2)); /* use SEG_UGET_HEAP ?? */ reg.offset += 4; /* Step over header */ if ((objtype == sci_obj_object) || (objtype == sci_obj_class)) { /* object or class? */ int superclass; reg.offset -= SCRIPT_OBJECT_MAGIC_OFFSET; superclass = OBJ_SUPERCLASS(s, reg); /* Get superclass... */ if (superclass >= 0) { int superclass_script = s->classtable[superclass].script; if (superclass_script == script_nr) { if (sm_get_lockers(&s->seg_manager, reg.segment, SEG_ID)) sm_decrement_lockers(&s->seg_manager, reg.segment, SEG_ID); /* Decrease lockers if this is us ourselves */ } else script_uninstantiate(s, superclass_script); /* Recurse to assure that the superclass lockers number gets decreased */ } reg.offset += SCRIPT_OBJECT_MAGIC_OFFSET; } /* if object or class */ reg.offset -= 4; /* Step back on header */ } while (objtype != 0); } void script_uninstantiate(state_t *s, int script_nr) { reg_t reg = make_reg(0, (s->version < SCI_VERSION_FTU_NEW_SCRIPT_HEADER) ? 2 : 0); int i; reg.segment = sm_seg_get(&s->seg_manager, script_nr); if (!sm_script_is_loaded(&s->seg_manager, script_nr, SCRIPT_ID) || reg.segment <= 0) { /* Is it already loaded? */ /* sciprintf("Warning: unloading script 0x%x requested although not loaded\n", script_nr); */ /* This is perfectly valid SCI behaviour */ return; } sm_decrement_lockers(&s->seg_manager, reg.segment, SEG_ID); /* One less locker */ if (sm_get_lockers(&s->seg_manager, reg.segment, SEG_ID) > 0) return; /* Free all classtable references to this script */ for (i = 0; i < s->classtable_size; i++) if (s->classtable[i].reg.segment == reg.segment) s->classtable[i].reg = NULL_REG; if (s->version < SCI_VERSION(1, 001, 000)) script_uninstantiate_sci0(s, script_nr, reg.segment); else sciprintf("FIXME: Add proper script uninstantiation for SCI 1.1\n"); if (sm_get_lockers(&s->seg_manager, reg.segment, SEG_ID)) return; /* if xxx.lockers > 0 */ /* Otherwise unload it completely */ /* Explanation: I'm starting to believe that this work is done by SCI itself. */ sm_mark_script_deleted(&s->seg_manager, script_nr); if (script_checkloads_flag) sciprintf("Unloaded script 0x%x.\n", script_nr); return; } static void _init_stack_base_with_selector(state_t *s, selector_t selector) { s->stack_base[0] = make_reg(0, (word) selector); s->stack_base[1] = NULL_REG; } static state_t * _game_run(state_t *s, int restoring) { state_t *successor = NULL; int game_is_finished = 0; do { s->execution_stack_pos_changed = 0; run_vm(s, (successor || restoring) ? 1 : 0); if (s->restarting_flags & SCI_GAME_IS_RESTARTING_NOW) { /* Restart was requested? */ free(s->execution_stack); s->execution_stack = NULL; s->execution_stack_pos = -1; s->execution_stack_pos_changed = 0; game_exit(s); script_free_engine(s); script_init_engine(s, s->version); game_init(s); sfx_reset_player(); _init_stack_base_with_selector(s, s->selector_map.play); /* Call the play selector */ send_selector(s, s->game_obj, s->game_obj, s->stack_base, 2, s->stack_base); script_abort_flag = 0; s->restarting_flags = SCI_GAME_WAS_RESTARTED | SCI_GAME_WAS_RESTARTED_AT_LEAST_ONCE; } else { successor = s->successor; if (successor) { game_exit(s); script_free_vm_memory(s); free(s); s = successor; if (!send_calls_allocated) send_calls = (calls_struct_t*)sci_calloc(sizeof(calls_struct_t), send_calls_allocated = 16); if (script_abort_flag == SCRIPT_ABORT_WITH_REPLAY) { sciprintf("Restarting with replay()\n"); s->execution_stack_pos = -1; /* Resatart with replay */ _init_stack_base_with_selector(s, s->selector_map.replay); /* Call the replay selector */ send_selector(s, s->game_obj, s->game_obj, s->stack_base, 2, s->stack_base); } script_abort_flag = 0; } else game_is_finished = 1; } } while (!game_is_finished); return s; } int objinfo(state_t *s, reg_t pos); int game_run(state_t **_s) { state_t *s = *_s; sciprintf(" Calling %s::play()\n", s->game_name); _init_stack_base_with_selector(s, s->selector_map.play); /* Call the play selector */ /* Now: Register the first element on the execution stack- */ if (!send_selector(s, s->game_obj, s->game_obj, s->stack_base, 2, s->stack_base) || script_error_flag) { objinfo(s, s->game_obj); sciprintf("Failed to run the game! Aborting...\n"); return 1; } /* and ENGAGE! */ *_s = s = _game_run(s, 0); sciprintf(" Game::play() finished.\n"); return 0; } int game_restore(state_t **_s, char *game_name) { state_t *s; int debug_state = _debugstate_valid; sciprintf("Restoring savegame '%s'...\n", game_name); s = gamestate_restore(*_s, game_name); if (!s) { sciprintf("Restoring gamestate '%s' failed.\n", game_name); return 1; } _debugstate_valid = debug_state; script_abort_flag = 0; s->restarting_flags = 0; s->execution_stack_pos = -1; /* Resatart with replay */ _init_stack_base_with_selector(s, s->selector_map.replay); /* Call the replay selector */ send_selector(s, s->game_obj, s->game_obj, s->stack_base, 2, s->stack_base); *_s = s = _game_run(s, 1); sciprintf(" Game::play() finished.\n"); return 0; } object_t * obj_get(state_t *s, reg_t offset) { mem_obj_t *memobj = GET_OBJECT_SEGMENT(s->seg_manager, offset.segment); object_t *obj = NULL; int idx; if (memobj != NULL) { if (memobj->type == MEM_OBJ_CLONES && ENTRY_IS_VALID(&memobj->data.clones, offset.offset)) obj = &(memobj->data.clones.table[offset.offset].entry); else if (memobj->type == MEM_OBJ_SCRIPT) { if (offset.offset <= memobj->data.script.buf_size && offset.offset >= -SCRIPT_OBJECT_MAGIC_OFFSET && RAW_IS_OBJECT(memobj->data.script.buf + offset.offset)) { idx = RAW_GET_CLASS_INDEX(&(memobj->data.script), offset); if (idx >= 0 && idx < memobj->data.script.objects_nr) obj = memobj->data.script.objects + idx; } } } return obj; } const char * obj_get_name(struct _state *s, reg_t pos) { object_t *obj = obj_get(s, pos); if (!obj) return ""; return (const char*)(obj->base + obj->variables[SCRIPT_NAME_SELECTOR].offset); } void quit_vm() { script_abort_flag = 1; /* Terminate VM */ _debugstate_valid = 0; _debug_seeking = 0; _debug_step_running = 0; }