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-rw-r--r--arch/arm/kernel/vmlinux-xip.lds.S115
1 files changed, 65 insertions, 50 deletions
diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S
index 0951df916b85..ec4b3f94ad80 100644
--- a/arch/arm/kernel/vmlinux-xip.lds.S
+++ b/arch/arm/kernel/vmlinux-xip.lds.S
@@ -7,6 +7,8 @@
/* 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-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
@@ -78,9 +80,7 @@ SECTIONS
*(.text.fixup)
*(__ex_table)
#endif
-#ifndef CONFIG_SMP_ON_UP
*(.alt.smp.init)
-#endif
*(.discard)
*(.discard.*)
}
@@ -182,19 +182,7 @@ SECTIONS
*(.taglist.init)
__tagtable_end = .;
}
-#ifdef CONFIG_SMP_ON_UP
- .init.smpalt : {
- __smpalt_begin = .;
- *(.alt.smp.init)
- __smpalt_end = .;
- }
-#endif
- .init.pv_table : {
- __pv_table_begin = .;
- *(.pv_table)
- __pv_table_end = .;
- }
- .init.data : {
+ .init.rodata : {
INIT_SETUP(16)
INIT_CALLS
CON_INITCALL
@@ -202,48 +190,49 @@ SECTIONS
INIT_RAM_FS
}
-#ifdef CONFIG_SMP
- PERCPU_SECTION(L1_CACHE_BYTES)
+#ifdef CONFIG_ARM_MPU
+ . = ALIGN(SZ_128K);
#endif
-
_exiprom = .; /* End of XIP ROM area */
- __data_loc = ALIGN(4); /* location in binary */
- . = PAGE_OFFSET + TEXT_OFFSET;
- .data : AT(__data_loc) {
- _data = .; /* address in memory */
- _sdata = .;
-
- /*
- * first, the init task union, aligned
- * to an 8192 byte boundary.
- */
- INIT_TASK_DATA(THREAD_SIZE)
+/*
+ * 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_SECTION(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 = .;
+ . = 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)
- . = ALIGN(PAGE_SIZE);
- __init_end = .;
-
- *(.data..ro_after_init)
-
- NOSAVE_DATA
- CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
- READ_MOSTLY_DATA(L1_CACHE_BYTES)
-
- /*
- * and the usual data section
- */
- DATA_DATA
- CONSTRUCTORS
-
- _edata = .;
}
- _edata_loc = __data_loc + SIZEOF(.data);
+#ifdef CONFIG_SMP
+ PERCPU_SECTION(L1_CACHE_BYTES)
+#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);
- BUG_TABLE
+ . = ALIGN(PAGE_SIZE);
+ __init_end = .;
#ifdef CONFIG_HAVE_TCM
/*
@@ -302,7 +291,7 @@ SECTIONS
}
#endif
- BSS_SECTION(0, 0, 0)
+ BSS_SECTION(0, 0, 8)
_end = .;
STABS_DEBUG
@@ -323,3 +312,29 @@ ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
*/
ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
"HYP init code too big or misaligned")
+
+#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
+
+#ifdef CONFIG_ARM_MPU
+/*
+ * 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