Fix C++ test crash because of misaligned stack

tests/CMakeLists.txt

@@ -24,8 +24,7 @@ else()
 endif()
 
 set(options "-f" "${asm_format}")
-if(APPLE
-    OR (WIN32 AND (CMAKE_SIZEOF_VOID_P EQUAL 4 OR SUBHOOK_FORCE_32BIT)))
+if(APPLE OR (WIN32 AND (CMAKE_SIZEOF_VOID_P EQUAL 4 OR SUBHOOK_FORCE_32BIT)))
   list(APPEND options "--prefix=_")
 endif()
 if(CMAKE_SYSTEM_NAME MATCHES "Linux")

tests/foo.cpp

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+extern "C" void foo() {
+  puts("foo() called");
+}

tests/foo.sh

@@ -1,7 +0,0 @@
-#!/bin/sh
-
-yasm -f elf64 foo_64_unix.asm
-gcc -c foo_main.c -o foo_main.o
-gcc foo_64_unix.o foo_main.o -o foo
-
-./foo

tests/foo_32.asm

@@ -1,7 +1,7 @@
 extern puts
 global foo
 
-section .data
+section .rodata
 
 message:
   db 'foo() called', 0
@@ -21,11 +21,11 @@ section .text
 %define nop9 db 0x66, 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 ; 66 NOP DWORD ptr [EAX + EAX*1 + 00000000H]
 
 foo:
-  nop
   push ebp
+  mov ebp, esp
+  sub esp, 4 ; align the stack to a 16-byte boundary
   push message
   call puts
-  add esp, 4
+  mov esp, ebp
   pop ebp
-  xor eax, eax
   ret

tests/foo_main.cpp

@@ -0,0 +1,6 @@
+extern "C" void foo(void);
+
+int main() {
+    foo();
+    return 0;
+}

tests/test.c

@@ -11,7 +11,8 @@ typedef void (*foo_func_t)(void);
   #elif defined SUBHOOK_UNIX
     #define FOO_CALL __attribute__((cdecl))
   #endif
-#else
+#endif
+#ifndef FOO_CALL
   #define FOO_CALL
 #endif
 

tests/test.cpp

@@ -9,7 +9,8 @@ typedef void (*foo_func_t)();
   #elif defined SUBHOOK_UNIX
     #define FOO_CALL __attribute__((cdecl))
   #endif
-#else
+#endif
+#ifndef FOO_CALL
   #define FOO_CALL
 #endif