arm/build: Refactor linker script headers

In preparation for adding --orphan-handling=warn, refactor the linker
script header includes, and extract common macros.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Russell King <linux@armlinux.org.uk>
Link: https://lore.kernel.org/r/20200821194310.3089815-16-keescook@chromium.org

1 files changed, 130 insertions, 0 deletions

diff --git a/arch/arm/include/asm/vmlinux.lds.h b/arch/arm/include/asm/vmlinux.lds.h
new file mode 100644
index 000000000000..a08f4301b718
--- /dev/null
+++ b/arch/arm/include/asm/vmlinux.lds.h
@@ -0,0 +1,130 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <asm-generic/vmlinux.lds.h>
+
+#ifdef CONFIG_HOTPLUG_CPU
+#define ARM_CPU_DISCARD(x)
+#define ARM_CPU_KEEP(x)		x
+#else
+#define ARM_CPU_DISCARD(x)	x
+#define ARM_CPU_KEEP(x)
+#endif
+
+#if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \
+	defined(CONFIG_GENERIC_BUG) || defined(CONFIG_JUMP_LABEL)
+#define ARM_EXIT_KEEP(x)	x
+#define ARM_EXIT_DISCARD(x)
+#else
+#define ARM_EXIT_KEEP(x)
+#define ARM_EXIT_DISCARD(x)	x
+#endif
+
+#ifdef CONFIG_MMU
+#define ARM_MMU_KEEP(x)		x
+#define ARM_MMU_DISCARD(x)
+#else
+#define ARM_MMU_KEEP(x)
+#define ARM_MMU_DISCARD(x)	x
+#endif
+
+#define PROC_INFO							\
+		. = ALIGN(4);						\
+		__proc_info_begin = .;					\
+		*(.proc.info.init)					\
+		__proc_info_end = .;
+
+#define IDMAP_TEXT							\
+		ALIGN_FUNCTION();					\
+		__idmap_text_start = .;					\
+		*(.idmap.text)						\
+		__idmap_text_end = .;					\
+
+#define ARM_DISCARD							\
+		*(.ARM.exidx.exit.text)					\
+		*(.ARM.extab.exit.text)					\
+		*(.ARM.exidx.text.exit)					\
+		*(.ARM.extab.text.exit)					\
+		ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))		\
+		ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))		\
+		ARM_EXIT_DISCARD(EXIT_TEXT)				\
+		ARM_EXIT_DISCARD(EXIT_DATA)				\
+		EXIT_CALL						\
+		ARM_MMU_DISCARD(*(.text.fixup))				\
+		ARM_MMU_DISCARD(*(__ex_table))				\
+		COMMON_DISCARDS
+
+#define ARM_STUBS_TEXT							\
+		*(.gnu.warning)						\
+		*(.glue_7)						\
+		*(.glue_7t)
+
+#define ARM_TEXT							\
+		IDMAP_TEXT						\
+		__entry_text_start = .;					\
+		*(.entry.text)						\
+		__entry_text_end = .;					\
+		IRQENTRY_TEXT						\
+		SOFTIRQENTRY_TEXT					\
+		TEXT_TEXT						\
+		SCHED_TEXT						\
+		CPUIDLE_TEXT						\
+		LOCK_TEXT						\
+		KPROBES_TEXT						\
+		ARM_STUBS_TEXT						\
+		. = ALIGN(4);						\
+		*(.got)			/* Global offset table */	\
+		ARM_CPU_KEEP(PROC_INFO)
+
+/* Stack unwinding tables */
+#define ARM_UNWIND_SECTIONS						\
+	. = ALIGN(8);							\
+	.ARM.unwind_idx : {						\
+		__start_unwind_idx = .;					\
+		*(.ARM.exidx*)						\
+		__stop_unwind_idx = .;					\
+	}								\
+	.ARM.unwind_tab : {						\
+		__start_unwind_tab = .;					\
+		*(.ARM.extab*)						\
+		__stop_unwind_tab = .;					\
+	}
+
+/*
+ * The vectors and stubs are relocatable code, and the
+ * only thing that matters is their relative offsets
+ */
+#define ARM_VECTORS							\
+	__vectors_start = .;						\
+	.vectors 0xffff0000 : AT(__vectors_start) {			\
+		*(.vectors)						\
+	}								\
+	. = __vectors_start + SIZEOF(.vectors);				\
+	__vectors_end = .;						\
+									\
+	__stubs_start = .;						\
+	.stubs ADDR(.vectors) + 0x1000 : AT(__stubs_start) {		\
+		*(.stubs)						\
+	}								\
+	. = __stubs_start + SIZEOF(.stubs);				\
+	__stubs_end = .;						\
+									\
+	PROVIDE(vector_fiq_offset = vector_fiq - ADDR(.vectors));
+
+#define ARM_TCM								\
+	__itcm_start = ALIGN(4);					\
+	.text_itcm ITCM_OFFSET : AT(__itcm_start - LOAD_OFFSET) {	\
+		__sitcm_text = .;					\
+		*(.tcm.text)						\
+		*(.tcm.rodata)						\
+		. = ALIGN(4);						\
+		__eitcm_text = .;					\
+	}								\
+	. = __itcm_start + SIZEOF(.text_itcm);				\
+									\
+	__dtcm_start = .;						\
+	.data_dtcm DTCM_OFFSET : AT(__dtcm_start - LOAD_OFFSET) {	\
+		__sdtcm_data = .;					\
+		*(.tcm.data)						\
+		. = ALIGN(4);						\
+		__edtcm_data = .;					\
+	}								\
+	. = __dtcm_start + SIZEOF(.data_dtcm);