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-rw-r--r--arch/arm/kernel/vmlinux-xip.lds.S196
1 files changed, 196 insertions, 0 deletions
diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S
new file mode 100644
index 0000000000..c16d196b5a
--- /dev/null
+++ b/arch/arm/kernel/vmlinux-xip.lds.S
@@ -0,0 +1,196 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* ld script to make ARM Linux kernel
+ * taken from the i386 version by Russell King
+ * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+ */
+
+/* No __ro_after_init data in the .rodata section - which will always be ro */
+#define RO_AFTER_INIT_DATA
+
+#include <linux/sizes.h>
+
+#include <asm/vmlinux.lds.h>
+#include <asm/cache.h>
+#include <asm/thread_info.h>
+#include <asm/page.h>
+#include <asm/mpu.h>
+
+OUTPUT_ARCH(arm)
+ENTRY(stext)
+
+#ifndef __ARMEB__
+jiffies = jiffies_64;
+#else
+jiffies = jiffies_64 + 4;
+#endif
+
+SECTIONS
+{
+ /*
+ * XXX: The linker does not define how output sections are
+ * assigned to input sections when there are multiple statements
+ * matching the same input section name. There is no documented
+ * order of matching.
+ *
+ * unwind exit sections must be discarded before the rest of the
+ * unwind sections get included.
+ */
+ /DISCARD/ : {
+ ARM_DISCARD
+ *(.alt.smp.init)
+ *(.pv_table)
+#ifndef CONFIG_ARM_UNWIND
+ *(.ARM.exidx) *(.ARM.exidx.*)
+ *(.ARM.extab) *(.ARM.extab.*)
+#endif
+ }
+
+ . = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
+ _xiprom = .; /* XIP ROM area to be mapped */
+
+ .head.text : {
+ _text = .;
+ HEAD_TEXT
+ }
+
+ .text : { /* Real text segment */
+ _stext = .; /* Text and read-only data */
+ ARM_TEXT
+ }
+
+ RO_DATA(PAGE_SIZE)
+
+ . = ALIGN(4);
+ __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
+ __start___ex_table = .;
+ ARM_MMU_KEEP(*(__ex_table))
+ __stop___ex_table = .;
+ }
+
+#ifdef CONFIG_ARM_UNWIND
+ ARM_UNWIND_SECTIONS
+#endif
+
+ _etext = .; /* End of text and rodata section */
+
+ ARM_VECTORS
+ INIT_TEXT_SECTION(8)
+ .exit.text : {
+ ARM_EXIT_KEEP(EXIT_TEXT)
+ }
+ .init.proc.info : {
+ ARM_CPU_DISCARD(PROC_INFO)
+ }
+ .init.arch.info : {
+ __arch_info_begin = .;
+ *(.arch.info.init)
+ __arch_info_end = .;
+ }
+ .init.tagtable : {
+ __tagtable_begin = .;
+ *(.taglist.init)
+ __tagtable_end = .;
+ }
+ .init.rodata : {
+ INIT_SETUP(16)
+ INIT_CALLS
+ CON_INITCALL
+ INIT_RAM_FS
+ }
+
+#ifdef CONFIG_ARM_MPU
+ . = ALIGN(SZ_128K);
+#endif
+ _exiprom = .; /* End of XIP ROM area */
+
+/*
+ * From this point, stuff is considered writable and will be copied to RAM
+ */
+ __data_loc = ALIGN(4); /* location in file */
+ . = PAGE_OFFSET + TEXT_OFFSET; /* location in memory */
+#undef LOAD_OFFSET
+#define LOAD_OFFSET (PAGE_OFFSET + TEXT_OFFSET - __data_loc)
+
+ . = ALIGN(THREAD_SIZE);
+ _sdata = .;
+ RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
+ .data.ro_after_init : AT(ADDR(.data.ro_after_init) - LOAD_OFFSET) {
+ *(.data..ro_after_init)
+ }
+ _edata = .;
+
+ . = ALIGN(PAGE_SIZE);
+ __init_begin = .;
+ .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
+ INIT_DATA
+ }
+ .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
+ ARM_EXIT_KEEP(EXIT_DATA)
+ }
+#ifdef CONFIG_SMP
+ PERCPU_SECTION(L1_CACHE_BYTES)
+#endif
+
+#ifdef CONFIG_HAVE_TCM
+ ARM_TCM
+#endif
+
+ /*
+ * End of copied data. We need a dummy section to get its LMA.
+ * Also located before final ALIGN() as trailing padding is not stored
+ * in the resulting binary file and useless to copy.
+ */
+ .data.endmark : AT(ADDR(.data.endmark) - LOAD_OFFSET) { }
+ _edata_loc = LOADADDR(.data.endmark);
+
+ . = ALIGN(PAGE_SIZE);
+ __init_end = .;
+
+ BSS_SECTION(0, 0, 8)
+#ifdef CONFIG_ARM_MPU
+ . = ALIGN(PMSAv8_MINALIGN);
+#endif
+ _end = .;
+
+ STABS_DEBUG
+ DWARF_DEBUG
+ ARM_DETAILS
+
+ ARM_ASSERTS
+}
+
+/*
+ * These must never be empty
+ * If you have to comment these two assert statements out, your
+ * binutils is too old (for other reasons as well)
+ */
+ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
+#ifndef CONFIG_COMPILE_TEST
+ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
+#endif
+
+#ifdef CONFIG_XIP_DEFLATED_DATA
+/*
+ * The .bss is used as a stack area for __inflate_kernel_data() whose stack
+ * frame is 9568 bytes. Make sure it has extra room left.
+ */
+ASSERT((_end - __bss_start) >= 12288, ".bss too small for CONFIG_XIP_DEFLATED_DATA")
+#endif
+
+#if defined(CONFIG_ARM_MPU) && !defined(CONFIG_COMPILE_TEST)
+/*
+ * Due to PMSAv7 restriction on base address and size we have to
+ * enforce minimal alignment restrictions. It was seen that weaker
+ * alignment restriction on _xiprom will likely force XIP address
+ * space spawns multiple MPU regions thus it is likely we run in
+ * situation when we are reprogramming MPU region we run on with
+ * something which doesn't cover reprogramming code itself, so as soon
+ * as we update MPU settings we'd immediately try to execute straight
+ * from background region which is XN.
+ * It seem that alignment in 1M should suit most users.
+ * _exiprom is aligned as 1/8 of 1M so can be covered by subregion
+ * disable
+ */
+ASSERT(!(_xiprom & (SZ_1M - 1)), "XIP start address may cause MPU programming issues")
+ASSERT(!(_exiprom & (SZ_128K - 1)), "XIP end address may cause MPU programming issues")
+#endif