Handout

kernel/compiler/sections.ld

@@ -0,0 +1,106 @@
+/* Entry in our OS -- label 'startup_bsp' in file boot/startup.asm */
+ENTRY(startup_bsp)
+
+SECTIONS
+ {
+	/* start address of our kernel */
+	. = 16M;
+
+	___KERNEL_START___ = .;
+
+	.boot :
+	{
+		/* Multiboot Header should be at the very beginning */
+		*(.multiboot_header)
+	}
+
+
+	.text :
+	{
+		*(".text")
+		*(".text$")
+		*(".init")
+		*(".fini")
+		*(".gnu.linkonce.*")
+		KEEP(*(.note.gnu.build-id))
+	}
+
+	/* lists containing the start address of global constructors and destructors (generated by the compiler) */
+	.preinit_array :
+	{
+		PROVIDE_HIDDEN (__preinit_array_start = .);
+		KEEP (*(.preinit_array))
+		PROVIDE_HIDDEN (__preinit_array_end = .);
+	}
+	.init_array :
+	{
+		PROVIDE_HIDDEN (__init_array_start = .);
+		KEEP (*(SORT(.init_array.*)))
+		KEEP (*(.init_array))
+		PROVIDE_HIDDEN (__init_array_end = .);
+	}
+	.fini_array :
+	{
+		PROVIDE_HIDDEN (__fini_array_start = .);
+		KEEP (*(SORT(.fini_array.*)))
+		KEEP (*(.fini_array))
+		PROVIDE_HIDDEN (__fini_array_end = .);
+	}
+
+
+	.data :
+	{
+		*(".data")
+		*(".data$")
+		*(".rodata")
+		___CTOR_LIST__ = .;
+		*(".ctors")
+		*(".ctor")
+		___CTOR_LIST_END__ = .;
+		___DTOR_LIST__ = .;
+		*(".dtors")
+		*(".dtor")
+		___DTOR_LIST_END__ = .;
+		*(".got")
+		*(".got.plt")
+		*(".eh_frame")
+		*(".eh_fram")
+		*(".jcr")
+	}
+
+	/* Start for application processors, relocated by APIC::init()
+	 * to a below 1 MB address to boot from real mode.
+	 * It is possible to let the linker place it at a below 1 MB address,
+	 * while all the rest starts at 16 MB. This will work for multiboot
+	 * compliant boot loader like GRUB and PXELINUX, however,
+	 * the qemu boot loader cannot handle such ELF files (yet)...
+	 * That's why we have to do it in our software */
+	.setup_ap_seg ALIGN(0x10) :
+	{
+		___SETUP_AP_START__ = .;
+		*(".setup_ap_seg")
+		*(".setup_ap_seg$")
+	}
+	___SETUP_AP_END__ = .;
+
+	.bss :
+	{
+		*(".bss")
+		*(".bss.*")
+		*(COMMON)
+	}
+	___KERNEL_END___ = .;
+
+
+	/DISCARD/ :
+	{
+		*(".note")
+		*(".comment")
+/* Keep debug information
+		*(".debug_line")
+		*(".debug_info")
+		*(".debug_abbrev")
+		*(".debug_aranges")
+*/
+	}
+ }