Preserve ebp in stackman_switch, win_x86. Do not compile runtime checks in c-wrapper.

Author: kristjanvalur

lib/win_x86/stackman.lib

@@ -5,13 +5,12 @@
 .code
 
 stackman_switch_raw PROC callback:DWORD, context:DWORD
-  
+  ;Assembler has already pushed the basepointer and saved it.
   ;save registers. EAX ECX and EDX are available for function use and thus
   ;do not have to be stored.
   push ebx
   push esi
   push edi
-  push ebp
   
   mov esi, callback ;      /* save 'callback' for later */
   mov edi, context ;       /* save 'context' for later         */
@@ -22,16 +21,20 @@ stackman_switch_raw PROC callback:DWORD, context:DWORD
   push 0;                  /* arg 2: opcode STACKMAN_OP_SAVE     */ 
   push edi ;               /* arg 1: context                     */
   call esi ;               /* call callback()                    */
-
-  mov esp, eax;            /* change the stack pointer */
+  add esp, 12;
+  
+  mov ecx, eax;			   /* change stack pointer to eax, preserving */
+  sub ecx, esp;            /* base pointer offset from esp */
+  mov esp, eax;
+  add ebp, ecx;
+  
 
   push eax ;               /* arg 3: current (new) stack pointer */
   push 1;                  /* arg 2: opcode STACKMAN_OP_RESTORE  */ 
   push edi ;               /* arg 1: context                     */
   call esi ;               /* call callback()                    */
   add esp, 12
 
-  pop  ebp
   pop  edi
   pop  esi
   pop  ebx

src/platforms/switch_x86_msvc.asm

@@ -175,7 +175,10 @@
     <ClInclude Include="..\..\src\stackman_switch.h" />
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\src\stackman.c" />
+    <ClCompile Include="..\..\src\stackman.c">
+      <SupportJustMyCode Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">false</SupportJustMyCode>
+      <BasicRuntimeChecks Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">Default</BasicRuntimeChecks>
+    </ClCompile>
     <ClCompile Include="template.c">
       <AssemblerOutput Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">AssemblyCode</AssemblerOutput>
       <AssemblerOutput Condition="'$(Configuration)|$(Platform)'=='Debug|ARM'">AssemblyCode</AssemblerOutput>
@@ -199,10 +202,14 @@
     <MARMASM Include="..\..\src\platforms\switch_arm_msvc.asm">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
     </MARMASM>
     <MARMASM Include="..\..\src\platforms\switch_arm64_msvc.asm">
       <FileType>Document</FileType>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
     </MARMASM>
     <MASM Include="..\..\src\platforms\switch_x64_msvc.asm">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>