Initial building of the vdso.

Not actually integrating with the kernel yet.

src/arch/x86_64/vdso.ld

@@ -0,0 +1,67 @@
+PHDRS {
+	rodata PT_LOAD FLAGS(4) FILEHDR PHDRS ;
+	text PT_LOAD FLAGS(5) ;
+	dynamic PT_DYNAMIC FLAGS(4) ;
+	note PT_NOTE ;
+	eh_frame PT_GNU_EH_FRAME ;
+}
+
+SECTIONS {
+	. = SIZEOF_HEADERS;
+
+	/DISCARD/ : {
+		*(.got*)
+		*(.plt*)
+		*(.note.*)
+		*(.hash*)
+	}
+
+	.illegal.relocations : {
+		*(.rel*)
+	}
+
+	.illegal.writeable : {
+		*(.data*)
+		*(.bss*)
+	}
+
+	.rodata : {
+		*(.rodata*)
+	} :rodata
+
+	.dynamic : {
+		*(.dynamic)
+	} :dynamic
+
+	.dynsym : {
+		*(.dynsym*)
+	} :rodata :dynamic
+
+	.dynstr : {
+		*(.dynstr*)
+	} :rodata :dynamic
+
+	.gnu.hash : {
+		*(.gnu.hash*)
+	} :rodata
+
+	.eh_frame_hdr : {
+		__eh_frame_start = .;
+		KEEP(*(.eh_frame))
+		__eh_frame_end = .;
+
+		KEEP(*(.eh_frame_hdr))
+	} :eh_frame
+
+	.text ALIGN(0x1000) : {
+		*(.text*)
+		*(.init*)
+		*(.fini*)
+		. = ALIGN(0x1000);
+	} :text
+
+	ASSERT(SIZEOF(.illegal.relocations) == 0,
+			"Code has introduced relocations into the VDSO")
+	ASSERT(SIZEOF(.illegal.writeable) == 0,
+			"Code has introduced writeable data into the VDSO")
+}