[linux] Centralise the linker script for Linux binaries

Reduce duplication between i386 and x86_64 by providing a single
shared linker script that both architectures can include.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/scripts/linux.lds

@@ -0,0 +1,101 @@
+/* -*- sh -*- */
+
+/*
+ * Linker script for Linux images
+ *
+ */
+
+SECTIONS {
+	_max_align = 32;
+
+	/*
+	 * The text section
+	 *
+	 */
+
+	. = ALIGN ( _max_align );
+	.text : {
+		_text = .;
+		*(.text)
+		*(.text.*)
+		_etext = .;
+	}
+
+	/*
+	 * The rodata section
+	 *
+	 */
+
+	. = ALIGN ( _max_align );
+	.rodata : {
+		_rodata = .;
+		*(.rodata)
+		*(.rodata.*)
+		_erodata = .;
+	}
+
+	/*
+	 * The data section
+	 *
+	 * Adjust the address for the data segment.  We want to adjust up to
+	 * the same address within the page on the next page up.
+	 */
+
+	. = ALIGN (CONSTANT (MAXPAGESIZE)) - ((CONSTANT (MAXPAGESIZE) - .) & (CONSTANT (MAXPAGESIZE) - 1));
+	. = DATA_SEGMENT_ALIGN (CONSTANT (MAXPAGESIZE), CONSTANT (COMMONPAGESIZE));
+	.data : {
+		_data = .;
+		*(.data)
+		*(.data.*)
+		KEEP(*(SORT(.tbl.*)))
+		KEEP(*(.provided))
+		KEEP(*(.provided.*))
+		_edata = .;
+	}
+
+	/*
+	 * The bss section
+	 *
+	 */
+
+	. = ALIGN ( _max_align );
+	.bss : {
+		_bss = .;
+		*(.bss)
+		*(.bss.*)
+		*(COMMON)
+		_ebss = .;
+	}
+
+	/*
+	 * Weak symbols that need zero values if not otherwise defined
+	 *
+	 */
+
+	.weak 0x0 : {
+		_weak = .;
+		*(.weak)
+		*(.weak.*)
+		_eweak = .;
+	}
+	_assert = ASSERT ( ( _weak == _eweak ), ".weak is non-zero length" );
+
+	/*
+	 * Dispose of the comment and note sections to make the link map
+	 * easier to read
+	 *
+	 */
+
+	/DISCARD/ : {
+		*(.comment)
+		*(.comment.*)
+		*(.note)
+		*(.note.*)
+		*(.rel)
+		*(.rel.*)
+		*(.discard)
+		*(.discard.*)
+		*(.sbat)
+		*(.sbat.*)
+	}
+}