make client functions parameterizable by version

system/client-functions/System/WriteAddressOfCode-59NL.x86.inc.s

@@ -0,0 +1,42 @@
+# This file defines the following function:
+#   write_address_of_code(
+#     const void* patch_code,
+#     size_t patch_code_size,
+#     void** ptr_addr);
+# This function allocates memory for patch_code, copies patch_code to that
+# memory, then writes the address of the allocated code at the specified
+# pointer. The allocated memory is never freed.
+# This function pops its arguments off the stack before returning.
+
+write_call_to_code:
+  # [esp + 0x04] = code ptr
+  # [esp + 0x08] = code size
+  # [esp + 0x0C] = ptr addr
+
+  # Allocate memory for the copied code
+  mov       ecx, [0x00AAB404]
+  push      dword [esp + 0x08]
+  mov       eax, 0x007A8A38
+  call      eax  # malloc7
+  test      eax, eax
+  je        done
+
+  # Copy the code to the newly-allocated memory
+  # eax = dest pointer (from malloc7 call above)
+  mov       edx, [esp + 0x04]  # edx = source pointer
+  mov       ecx, [esp + 0x08]  # ecx = source size
+  push      ebx
+memcpy_again:
+  dec       ecx
+  mov       bl, [edx + ecx]  # Copy one byte from source to dest
+  mov       [eax + ecx], bl
+  test      ecx, ecx
+  jne       memcpy_again
+  pop       ebx
+
+  # Write the address
+  mov       ecx, [esp + 0x0C]
+  mov       [ecx], eax
+
+done:
+  ret       0x0C