port pop16 and get_stack_reg

src/browser/starter.js

@@ -166,7 +166,6 @@ function V86Starter(options)
         "_arpl": function() { return cpu.arpl.apply(cpu, arguments); },
         "_trigger_ud": function() { return cpu.trigger_ud.apply(cpu, arguments); },
         "_trigger_nm": function() { return cpu.trigger_nm.apply(cpu, arguments); },
-        "_pop16": function() { return cpu.pop16.apply(cpu, arguments); },
         "_virt_boundary_read16": function() { return cpu.virt_boundary_read16.apply(cpu, arguments); },
         "_virt_boundary_read32s": function() { return cpu.virt_boundary_read32s.apply(cpu, arguments); },
         "_virt_boundary_write16": function() { return cpu.virt_boundary_write16.apply(cpu, arguments); },

src/cpu.js

@@ -298,6 +298,8 @@ CPU.prototype.wasm_patch = function(wm)
     this.push32 = this.wm.funcs['_push32'];
     this.pusha16 = this.wm.funcs['_pusha16'];
     this.pusha32 = this.wm.funcs['_pusha32'];
+    this.pop16 = this.wm.funcs['_pop16'];
+    this.get_stack_reg = this.wm.funcs['_get_stack_reg'];
 };
 
 CPU.prototype.get_state = function()

src/native/cpu.c

@@ -738,3 +738,16 @@ int32_t get_real_eip()
 {
     return *instruction_pointer - get_seg(CS);
 }
+
+int32_t get_stack_reg()
+{
+    if(*stack_size_32)
+    {
+        return reg32s[ESP];
+    }
+    else
+    {
+        return reg16[SP];
+    }
+}
+

src/native/misc_instr.c

@@ -224,6 +224,15 @@ void push32(int32_t imm32)
     }
 }
 
+int32_t pop16()
+{
+    int32_t sp = get_seg(SS) + get_stack_reg();
+    int32_t result = safe_read16(sp);
+
+    adjust_stack_reg(2);
+    return result;
+}
+
 int32_t pop32s()
 {
     if(*stack_size_32)