Espresso 0.0.2c

drivers/exec/secf.c

@@ -0,0 +1,48 @@
+/*
+  Simple Executable Code Format
+
+  SECF is a executable format for any platform (though designed with x86(-32) in mind.)
+  that makes use of registers, syscalls/interrupts, and other tables/structures instead of libraries.
+
+  register map:
+  (unused means the program can use the register without any issue, no data used/passed by the SECF will be there)
+
+  EAX: unused
+  EBX: unused
+  ECX: arg string length
+  EDX: variable area size (bytes)
+  ESI: pointer to arg string
+  EDI: unused
+  ESP: unused, normal function
+  EBP: pointer to variable area
+
+
+
+  The variable area is a area of a specific size (size in EDX) that can be used for storing variables/temporary data.
+  Any additional memory space needed can be aquired via malloc.
+  The minimum size of the variable area is 16 bytes and a maximum size of 64KiB.
+  
+  
+  Use syscall/int (number TBT) to call functions
+*/
+
+#include <types.h>
+#include <stdlib.h>
+
+void* init_var_area(size_t size)
+{
+  if (size == (size_t) 0)
+  {
+    return NULL; /* size 0 is invalid. */
+  }
+  else if (size >= 65536)
+  {
+   return NULL; /* size above 65,536 is invalid. */
+  }
+  else if (size < 16)
+  {
+    size = 16;
+  }
+  
+  return malloc(size); /* No need to check for null because we'd return null in that case */
+}