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-rw-r--r--engines/sci/engine/vm.cpp8
-rw-r--r--engines/sci/engine/vm.h1
2 files changed, 7 insertions, 2 deletions
diff --git a/engines/sci/engine/vm.cpp b/engines/sci/engine/vm.cpp
index 273492ccc6..3e12084ed6 100644
--- a/engines/sci/engine/vm.cpp
+++ b/engines/sci/engine/vm.cpp
@@ -239,6 +239,7 @@ ExecStack *execute_method(EngineState *s, uint16 script, uint16 pubfunct, StackP
// Check if a breakpoint is set on this method
g_sci->checkExportBreakpoint(script, pubfunct);
+ assert(argp[0].toUint16() == argc); // The first argument is argc
ExecStack xstack(calling_obj, calling_obj, sp, argc, argp,
seg, make_reg32(seg, exportAddr), -1, -1, -1, pubfunct, -1,
s->_executionStack.size() - 1, EXEC_STACK_TYPE_CALL);
@@ -312,6 +313,7 @@ ExecStack *send_selector(EngineState *s, reg_t send_obj, reg_t work_obj, StackPt
if (activeBreakpointTypes || DebugMan.isDebugChannelEnabled(kDebugLevelScripts))
debugSelectorCall(send_obj, selector, argc, argp, varp, funcp, s->_segMan, selectorType);
+ assert(argp[0].toUint16() == argc); // The first argument is argc
ExecStack xstack(work_obj, send_obj, curSP, argc, argp,
0xFFFF, curFP, selector, -1, -1, -1, -1,
origin, stackType);
@@ -386,6 +388,7 @@ static void callKernelFunc(EngineState *s, int kernelCallNr, int argc) {
// Call kernel function
if (!kernelCall.subFunctionCount) {
+ argv[-1] = make_reg(0, argc); // The first argument is argc
addKernelCallToExecStack(s, kernelCallNr, -1, argc, argv);
s->r_acc = kernelCall.function(s, argc, argv);
@@ -444,6 +447,7 @@ static void callKernelFunc(EngineState *s, int kernelCallNr, int argc) {
}
if (!kernelSubCall.function)
error("[VM] k%s: subfunction ID %d requested, but not available", kernelCall.name, subId);
+ argv[-1] = make_reg(0, argc); // The first argument is argc
addKernelCallToExecStack(s, kernelCallNr, subId, argc, argv);
s->r_acc = kernelSubCall.function(s, argc, argv);
@@ -837,8 +841,10 @@ void run_vm(EngineState *s) {
uint32 localCallOffset = s->xs->addr.pc.getOffset() + opparams[0];
+ int final_argc = (call_base->requireUint16()) + s->r_rest;
+ call_base[0] = make_reg(0, final_argc); // The first argument is argc
ExecStack xstack(s->xs->objp, s->xs->objp, s->xs->sp,
- (call_base->requireUint16()) + s->r_rest, call_base,
+ final_argc, call_base,
s->xs->local_segment, make_reg32(s->xs->addr.pc.getSegment(), localCallOffset),
NULL_SELECTOR, -1, -1, -1, localCallOffset, s->_executionStack.size() - 1,
EXEC_STACK_TYPE_CALL);
diff --git a/engines/sci/engine/vm.h b/engines/sci/engine/vm.h
index dc789b6201..c41060dc32 100644
--- a/engines/sci/engine/vm.h
+++ b/engines/sci/engine/vm.h
@@ -115,7 +115,6 @@ struct ExecStack {
fp = sp = sp_;
argc = argc_;
variables_argp = argp_;
- *variables_argp = make_reg(0, argc); // The first argument is argc
if (localsSegment_ != 0xFFFF)
local_segment = localsSegment_;
else