provided code

src/threads/kernel.lds.S

@@ -0,0 +1,30 @@
+#include "threads/loader.h"
+
+OUTPUT_FORMAT("elf32-i386")
+OUTPUT_ARCH("i386")
+ENTRY(start)			/* Kernel starts at "start" symbol. */
+SECTIONS
+{
+  /* Specify the kernel base address. */
+  _start = LOADER_PHYS_BASE + LOADER_KERN_BASE;
+
+  /* Make room for the ELF headers. */
+  . = _start + SIZEOF_HEADERS;
+
+  /* Kernel starts with code, followed by read-only data and writable data. */
+  .text : { *(.start) *(.text) } = 0x90
+  .rodata : { *(.rodata) *(.rodata.*) 
+	      . = ALIGN(0x1000); 
+	      _end_kernel_text = .; }
+  .data : { *(.data) *(.data.*)
+	    _signature = .; LONG(0xaa55aa55) }
+
+  /* BSS (zero-initialized data) is after everything else. */
+  _start_bss = .;
+  .bss : { *(.bss) }
+  _end_bss = .;
+
+  _end = .;
+
+  ASSERT (_end - _start <= 512K, "Kernel image is too big.")
+}