path: root/02-revert-TEXT_OFFSET-deletion.patch

From f91b2fb313bc6a6ffa1f8829d0320aa6b5627e91 Mon Sep 17 00:00:00 2001
From: root <root@aws.starx.ink>
Date: Sun, 20 Dec 2020 05:04:18 +0000
Subject: [PATCH 01/10] revert TEXT_OFFSET deletion 1/10

---
 drivers/firmware/efi/libstub/arm64-stub.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/efi/libstub/arm64-stub.c b/drivers/firmware/efi/libstub/arm64-stub.c
index 22ece1ad6..9154374f9 100644
--- a/drivers/firmware/efi/libstub/arm64-stub.c
+++ b/drivers/firmware/efi/libstub/arm64-stub.c
@@ -78,7 +78,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
 
 	kernel_size = _edata - _text;
 	kernel_memsize = kernel_size + (_end - _edata);
-	*reserve_size = kernel_memsize;
+	*reserve_size = kernel_memsize + TEXT_OFFSET % min_kimg_align();
 
 	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && phys_seed != 0) {
 		/*
@@ -92,7 +92,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
 	}
 
 	if (status != EFI_SUCCESS) {
-		if (IS_ALIGNED((u64)_text, min_kimg_align())) {
+		if (IS_ALIGNED((u64)_text - TEXT_OFFSET, min_kimg_align())) {
 			/*
 			 * Just execute from wherever we were loaded by the
 			 * UEFI PE/COFF loader if the alignment is suitable.
@@ -112,7 +112,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
 		}
 	}
 
-	*image_addr = *reserve_addr;
+	*image_addr = *reserve_addr + TEXT_OFFSET % min_kimg_align();;
 	memcpy((void *)*image_addr, _text, kernel_size);
 
 	return EFI_SUCCESS;
-- 
2.25.1

From 685eec5021a1938719339471d033d7dbaef74a38 Mon Sep 17 00:00:00 2001
From: root <root@aws.starx.ink>
Date: Sun, 20 Dec 2020 05:07:02 +0000
Subject: [PATCH 02/10] revert TEXT_OFFSET deletion 2/10

---
 drivers/firmware/efi/libstub/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index 8a94388e3..d11f29ae1 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -68,6 +68,7 @@ lib-$(CONFIG_ARM64)		+= arm64-stub.o
 lib-$(CONFIG_X86)		+= x86-stub.o
 lib-$(CONFIG_RISCV)		+= riscv-stub.o
 CFLAGS_arm32-stub.o		:= -DTEXT_OFFSET=$(TEXT_OFFSET)
+CFLAGS_arm64-stub.o		:= -DTEXT_OFFSET=$(TEXT_OFFSET)
 
 # Even when -mbranch-protection=none is set, Clang will generate a
 # .note.gnu.property for code-less object files (like lib/ctype.c),
-- 
2.25.1

From 2d1f57e3ce94637eeba6dd59f2a2c27edfcebbe9 Mon Sep 17 00:00:00 2001
From: root <root@aws.starx.ink>
Date: Sun, 20 Dec 2020 05:09:12 +0000
Subject: [PATCH 03/10] revert TEXT_OFFSET deletion 3/10

---
 arch/arm64/kernel/vmlinux.lds.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 1bda604f4..87ecbb53c 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -115,7 +115,7 @@ SECTIONS
 		*(.dynsym .dynstr .hash .gnu.hash)
 	}
 
-	. = KIMAGE_VADDR;
+	. = KIMAGE_VADDR + TEXT_OFFSET;
 
 	.head.text : {
 		_text = .;
@@ -307,4 +307,4 @@ ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) == PAGE_SIZE,
 /*
  * If padding is applied before .head.text, virt<->phys conversions will fail.
  */
-ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned")
+ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned")
-- 
2.25.1

From a77425e2080a41882f327e3aad6fafd4d335ee84 Mon Sep 17 00:00:00 2001
From: root <root@aws.starx.ink>
Date: Sun, 20 Dec 2020 05:10:35 +0000
Subject: [PATCH 04/10] revert TEXT_OFFSET deletion 4/10

---
 arch/arm64/kernel/image.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h
index 7bc3ba897..c7d38c660 100644
--- a/arch/arm64/kernel/image.h
+++ b/arch/arm64/kernel/image.h
@@ -62,6 +62,7 @@
  */
 #define HEAD_SYMBOLS						\
 	DEFINE_IMAGE_LE64(_kernel_size_le, _end - _text);	\
+	DEFINE_IMAGE_LE64(_kernel_offset_le, TEXT_OFFSET);	\
 	DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS);
 
 #endif /* __ARM64_KERNEL_IMAGE_H */
-- 
2.25.1

From 634c447bd70af8a124d9a67025ce5b2b86c22647 Mon Sep 17 00:00:00 2001
From: root <root@aws.starx.ink>
Date: Sun, 20 Dec 2020 05:14:55 +0000
Subject: [PATCH 05/10] revert TEXT_OFFSET deletion 5/10

---
 arch/arm64/kernel/head.S | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index d8d9caf02..a3c77cc7d 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -36,7 +36,7 @@
 
 #include "efi-header.S"
 
-#define __PHYS_OFFSET	KERNEL_START
+#define __PHYS_OFFSET	(KERNEL_START - TEXT_OFFSET)
 
 #if (PAGE_OFFSET & 0x1fffff) != 0
 #error PAGE_OFFSET must be at least 2MB aligned
@@ -51,7 +51,7 @@
  *   x0 = physical address to the FDT blob.
  *
  * This code is mostly position independent so you call this at
- * __pa(PAGE_OFFSET).
+ * __pa(PAGE_OFFSET + TEXT_OFFSET).
  *
  * Note that the callee-saved registers are used for storing variables
  * that are useful before the MMU is enabled. The allocations are described
@@ -73,7 +73,7 @@ _head:
 	b	primary_entry			// branch to kernel start, magic
 	.long	0				// reserved
 #endif
-	.quad	0				// Image load offset from start of RAM, little-endian
+	le64sym	_kernel_offset_le		// Image load offset from start of RAM, little-endian
 	le64sym	_kernel_size_le			// Effective size of kernel image, little-endian
 	le64sym	_kernel_flags_le		// Informative flags, little-endian
 	.quad	0				// reserved
@@ -378,7 +378,7 @@ SYM_FUNC_START_LOCAL(__create_page_tables)
 	 * Map the kernel image (starting with PHYS_OFFSET).
 	 */
 	adrp	x0, init_pg_dir
-	mov_q	x5, KIMAGE_VADDR		// compile time __va(_text)
+	mov_q	x5, KIMAGE_VADDR + TEXT_OFFSET	// compile time __va(_text)
 	add	x5, x5, x23			// add KASLR displacement
 	mov	x4, PTRS_PER_PGD
 	adrp	x6, _end			// runtime __pa(_end)
@@ -470,7 +470,7 @@ SYM_FUNC_END(__primary_switched)
 
 	.pushsection ".rodata", "a"
 SYM_DATA_START(kimage_vaddr)
-	.quad		_text
+	.quad		_text - TEXT_OFFSET
 SYM_DATA_END(kimage_vaddr)
 EXPORT_SYMBOL(kimage_vaddr)
 	.popsection
-- 
2.25.1

From 91f6c8039e9864960d954f33549dbfa2d9db029c Mon Sep 17 00:00:00 2001
From: root <root@aws.starx.ink>
Date: Sun, 20 Dec 2020 05:15:37 +0000
Subject: [PATCH 06/10] revert TEXT_OFFSET deletion 6/10

---
 arch/arm64/kernel/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index bbaf0bc4a..fd7dcbde3 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -2,7 +2,8 @@
 #
 # Makefile for the linux kernel.
 #
-
+CPPFLAGS_vmlinux.lds	:= -DTEXT_OFFSET=$(TEXT_OFFSET)
+AFLAGS_head.o		:= -DTEXT_OFFSET=$(TEXT_OFFSET)
 CFLAGS_armv8_deprecated.o := -I$(src)
 
 CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
-- 
2.25.1

From c81a2d884b9199faa4fc2dc7d4e6296fdd105030 Mon Sep 17 00:00:00 2001
From: root <root@aws.starx.ink>
Date: Sun, 20 Dec 2020 05:16:24 +0000
Subject: [PATCH 07/10] revert TEXT_OFFSET deletion 7/10

---
 arch/arm64/include/asm/memory.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index cd61239ba..5d1f91a99 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -173,7 +173,7 @@ extern s64			memstart_addr;
 /* PHYS_OFFSET - the physical address of the start of memory. */
 #define PHYS_OFFSET		({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
 
-/* the virtual base of the kernel image */
+/* the virtual base of the kernel image (minus TEXT_OFFSET) */
 extern u64			kimage_vaddr;
 
 /* the offset between the kernel virtual and physical mappings */
-- 
2.25.1

From 9890fc925c738e6a2db01a8b7265a6bbc43322b9 Mon Sep 17 00:00:00 2001
From: root <root@aws.starx.ink>
Date: Sun, 20 Dec 2020 05:17:07 +0000
Subject: [PATCH 08/10] revert TEXT_OFFSET deletion 8/10

---
 arch/arm64/include/asm/kernel-pgtable.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kernel-pgtable.h b/arch/arm64/include/asm/kernel-pgtable.h
index 19ca76ea6..329fb15f6 100644
--- a/arch/arm64/include/asm/kernel-pgtable.h
+++ b/arch/arm64/include/asm/kernel-pgtable.h
@@ -86,7 +86,7 @@
 			+ EARLY_PGDS((vstart), (vend)) 	/* each PGDIR needs a next level page table */	\
 			+ EARLY_PUDS((vstart), (vend))	/* each PUD needs a next level page table */	\
 			+ EARLY_PMDS((vstart), (vend)))	/* each PMD needs a next level page table */
-#define INIT_DIR_SIZE (PAGE_SIZE * EARLY_PAGES(KIMAGE_VADDR, _end))
+#define INIT_DIR_SIZE (PAGE_SIZE * EARLY_PAGES(KIMAGE_VADDR + TEXT_OFFSET, _end))
 #define IDMAP_DIR_SIZE		(IDMAP_PGTABLE_LEVELS * PAGE_SIZE)
 
 #ifdef CONFIG_ARM64_SW_TTBR0_PAN
-- 
2.25.1

From fb0aecac97ed2a7c9a3e94b5b3eb92ce95e9b9f5 Mon Sep 17 00:00:00 2001
From: root <root@aws.starx.ink>
Date: Sun, 20 Dec 2020 05:23:39 +0000
Subject: [PATCH 09/10] revert TEXT_OFFSET deletion 9/10

---
 arch/arm64/include/asm/boot.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/boot.h b/arch/arm64/include/asm/boot.h
index 3e7943fd1..c7f67da13 100644
--- a/arch/arm64/include/asm/boot.h
+++ b/arch/arm64/include/asm/boot.h
@@ -13,7 +13,8 @@
 #define MAX_FDT_SIZE		SZ_2M
 
 /*
- * arm64 requires the kernel image to placed at a 2 MB aligned base address
+ * arm64 requires the kernel image to placed
+ * TEXT_OFFSET bytes beyond a 2 MB aligned base
  */
 #define MIN_KIMG_ALIGN		SZ_2M
 
-- 
2.25.1

From 62b81a1ad22bc9d65777a60778cc9fcaa0b6ec11 Mon Sep 17 00:00:00 2001
From: root <root@aws.starx.ink>
Date: Sun, 20 Dec 2020 05:27:16 +0000
Subject: [PATCH 10/10] revert TEXT_OFFSET deletion 10/10

---
 arch/arm64/Makefile | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 6a87d592b..60626981a 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -11,6 +11,7 @@
 # Copyright (C) 1995-2001 by Russell King
 
 LDFLAGS_vmlinux	:=--no-undefined -X
+CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
 
 ifeq ($(CONFIG_RELOCATABLE), y)
 # Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
@@ -130,6 +131,9 @@ endif
 # Default value
 head-y		:= arch/arm64/kernel/head.o
 
+# The byte offset of the kernel image in RAM from the start of RAM.
+TEXT_OFFSET := 0x01080000
+
 ifeq ($(CONFIG_KASAN_SW_TAGS), y)
 KASAN_SHADOW_SCALE_SHIFT := 4
 else
@@ -140,6 +144,8 @@ KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 
+export	TEXT_OFFSET
+
 core-y		+= arch/arm64/
 libs-y		:= arch/arm64/lib/ $(libs-y)
 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
-- 
2.25.1