compile a 4.x kernel

device/.shared-patches/linux/fix-asm-offset-generation-to-work-with-clang-As.patch

@@ -0,0 +1,27 @@
+From 4d735839552d21d17f8d7d0ce6844034e4327b9d Mon Sep 17 00:00:00 2001
+From: SoundDrill31 <84176052+sounddrill31@users.noreply.github.com>
+Date: Sun, 9 Jun 2024 21:12:32 +0530
+Subject: [PATCH] kbuild: fix asm-offset generation to work with clang As
+ suggested here
+ https://github.com/MiCode/Xiaomi_Kernel_OpenSource/issues/2469#issuecomment-1583842583
+
+---
+ include/linux/kbuild.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/include/linux/kbuild.h b/include/linux/kbuild.h
+index 22a72198c14b..def34fd99cb3 100644
+--- a/include/linux/kbuild.h
++++ b/include/linux/kbuild.h
+@@ -2,9 +2,9 @@
+ #define __LINUX_KBUILD_H
+ 
+ #define DEFINE(sym, val) \
+-        asm volatile("\n->" #sym " %0 " #val : : "i" (val))
++        asm volatile("\n.ascii \"->" #sym " %0 " #val "\"" : : "i" (val))
+ 
+-#define BLANK() asm volatile("\n->" : : )
++#define BLANK() asm volatile("\n.ascii \"->\"" : : )
+ 
+ #define OFFSET(sym, str, mem) \
+ 	DEFINE(sym, offsetof(struct str, mem))

device/.shared-patches/linux/fix-register-sp-unsuitable.patch

@@ -0,0 +1,102 @@
+From c325d37ad9df1a0d1c5a16a12484590a45bfc0fa Mon Sep 17 00:00:00 2001
+From: Aster Boese <asterboese@mailbox.org>
+Date: Fri, 14 Feb 2025 00:30:05 -0500
+Subject: [PATCH] fix register sp unsuitable
+
+---
+ arch/arm64/include/asm/thread_info.h | 34 ++++------------------------
+ 1 file changed, 5 insertions(+), 29 deletions(-)
+
+diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
+index 855e07a7..720e70b6 100644
+--- a/arch/arm64/include/asm/thread_info.h
++++ b/arch/arm64/include/asm/thread_info.h
+@@ -51,8 +51,6 @@ struct thread_info {
+ 	struct restart_block	restart_block;
+ 	int			preempt_count;	/* 0 => preemptable, <0 => bug */
+ 	int			cpu;		/* cpu */
+-	void			*regs_on_excp;
+-	int			cpu_excp;
+ };
+ 
+ #define INIT_THREAD_INFO(tsk)						\
+@@ -65,17 +63,11 @@ struct thread_info {
+ 	.restart_block	= {						\
+ 		.fn	= do_no_restart_syscall,			\
+ 	},								\
+-	.cpu_excp	= 0,						\
+ }
+ 
+ #define init_thread_info	(init_thread_union.thread_info)
+ #define init_stack		(init_thread_union.stack)
+ 
+-/*
+- * how to get the current stack pointer from C
+- */
+-register unsigned long current_stack_pointer asm ("sp");
+-
+ /*
+  * how to get the thread information struct from C
+  */
+@@ -83,8 +75,8 @@ static inline struct thread_info *current_thread_info(void) __attribute_const__;
+ 
+ static inline struct thread_info *current_thread_info(void)
+ {
+-	return (struct thread_info *)
+-		(current_stack_pointer & ~(THREAD_SIZE - 1));
++	register unsigned long sp asm ("sp");
++	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
+ }
+ 
+ #define thread_saved_pc(tsk)	\
+@@ -99,23 +91,17 @@ static inline struct thread_info *current_thread_info(void)
+ /*
+  * thread information flags:
+  *  TIF_SYSCALL_TRACE	- syscall trace active
+- *  TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
+- *  TIF_SYSCALL_AUDIT	- syscall auditing
+- *  TIF_SECOMP		- syscall secure computing
+  *  TIF_SIGPENDING	- signal pending
+  *  TIF_NEED_RESCHED	- rescheduling necessary
+  *  TIF_NOTIFY_RESUME	- callback before returning to user
+  *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
++ *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
+  */
+ #define TIF_SIGPENDING		0
+ #define TIF_NEED_RESCHED	1
+ #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
+-#define TIF_FOREIGN_FPSTATE	3	/* CPU's FP state is not current's */
+-#define TIF_NOHZ		7
+ #define TIF_SYSCALL_TRACE	8
+-#define TIF_SYSCALL_AUDIT	9
+-#define TIF_SYSCALL_TRACEPOINT	10
+-#define TIF_SECCOMP		11
++#define TIF_POLLING_NRFLAG	16
+ #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
+ #define TIF_FREEZE		19
+ #define TIF_RESTORE_SIGMASK	20
+@@ -126,20 +112,10 @@ static inline struct thread_info *current_thread_info(void)
+ #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
+ #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
+ #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
+-#define _TIF_FOREIGN_FPSTATE	(1 << TIF_FOREIGN_FPSTATE)
+-#define _TIF_NOHZ		(1 << TIF_NOHZ)
+-#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
+-#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
+-#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
+-#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
+ #define _TIF_32BIT		(1 << TIF_32BIT)
+ 
+ #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
+-				 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE)
+-
+-#define _TIF_SYSCALL_WORK	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
+-				 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
+-				 _TIF_NOHZ)
++				 _TIF_NOTIFY_RESUME)
+ 
+ #endif /* __KERNEL__ */
+ #endif /* __ASM_THREAD_INFO_H */
+-- 
+2.48.1
+

device/testing/linux-amazon-douglas/0001-target-aarch64-assembly-with-llvm-on-arm64.patch

@@ -0,0 +1,28 @@
+From 17154cec67a5add459937be96fb9c76bda813fda Mon Sep 17 00:00:00 2001
+From: Aster Boese <asterboese@mailbox.org>
+Date: Fri, 21 Feb 2025 19:55:39 -0500
+Subject: [PATCH] target aarch64 assembly with llvm on arm64
+
+For some reason LLVM doesn't properly cross-compile on earlier kernel versions.
+This patch explicitly tells it that it is targeting aarch64.
+
+Taken from https://github.com/iovisor/bcc/issues/1202#issuecomment-333740246
+---
+ arch/arm64/Makefile | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
+index 5d76c71c..b6adbe37 100755
+--- a/arch/arm64/Makefile
++++ b/arch/arm64/Makefile
+@@ -21,6 +21,7 @@ KBUILD_DEFCONFIG := defconfig
+ 
+ KBUILD_CFLAGS	+= -mgeneral-regs-only
+ KBUILD_CFLAGS	+= -fno-pic
++KBUILD_CFLAGS   += -target aarch64
+ ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
+ KBUILD_CPPFLAGS	+= -mbig-endian
+ AS		+= -EB
+-- 
+2.48.1
+

device/testing/linux-amazon-douglas/APKBUILD

@@ -16,14 +16,7 @@ _flavor="amazon-douglas"
 url="https://kernel.org"
 license="GPL-2.0-only"
 options="!strip !check !tracedeps pmb:cross-native"
-makedepends="bash bc bison devicepkg-dev flex openssl-dev perl gcc6"
-
-# Compiler: GCC 6
-if [ "${CC:0:5}" != "gcc6-" ]; then
-	CC="gcc6-$CC"
-	HOSTCC="gcc6-gcc"
-	CROSS_COMPILE="gcc6-$CROSS_COMPILE"
-fi
+makedepends="bash bc bison clang devicepkg-dev flex lld llvm openssl-dev perl"
 
 # Source
 _repository="kernel_douglas"
@@ -34,7 +27,11 @@ source="
 	$_config
 	disable-sound.patch
 	gcc10-extern_YYLOC_global_declaration.patch
-"
+	fix-asm-offset-generation-to-work-with-clang-As.patch
+	fix-register-sp-unsuitable.patch
+	linux3.7to4.5-ARM64-remove-Sun-Solaris-style-flag-on-section.patch
+	0001-target-aarch64-assembly-with-llvm-on-arm64.patch
+	"
 builddir="$srcdir/$_repository-$_commit"
 _outdir="out"
 
@@ -45,15 +42,24 @@ prepare() {
 
 build() {
 	unset LDFLAGS
-	make O="$_outdir" ARCH="$_carch" CC="${CC:-gcc}" \
-		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS"
+	make O="$_outdir" ARCH="$_carch" \
+    CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \
+    OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump READELF=llvm-readelf \
+    HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar HOSTLD=ld.lld \
+    KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS"
 }
 
 package() {
 	downstreamkernel_package "$builddir" "$pkgdir" "$_carch" "$_flavor" "$_outdir"
 }
 
-sha512sums="eb3804fcbadb268429640a5171ea4788cf8974444a1aa1005801902dbce1c4d67d88cb43d0cee259dc082161a92b285de0a0d18d721220f6d2dff84a179a7dc5  linux-amazon-douglas-4ff2b5a4534e275748920ba4ad105af36495bf89.tar.gz
+sha512sums="
+eb3804fcbadb268429640a5171ea4788cf8974444a1aa1005801902dbce1c4d67d88cb43d0cee259dc082161a92b285de0a0d18d721220f6d2dff84a179a7dc5  linux-amazon-douglas-4ff2b5a4534e275748920ba4ad105af36495bf89.tar.gz
 a5c13415c5133eb71a40a71dc84c8d4f3ded3cc11650e46bfb9ffba2c01490f5008e659407c5977bd62a83069af23740f36d7236f6dfee0c5adad6d831772122  config-amazon-douglas.aarch64
 aed9fd018a6367214dd00aad9c376c93ed356efbd74e21b49316ab0a21bc372a2077eeed8810f66464544c5bbc7bca6c46985ef42e6cb8f95ad94a1644130d1c  disable-sound.patch
-2b48f1bf0e3f70703d2cdafc47d5e615cc7c56c70bec56b2e3297d3fa4a7a1321d649a8679614553dde8fe52ff1051dae38d5990e3744c9ca986d92187dcdbeb  gcc10-extern_YYLOC_global_declaration.patch"
+2b48f1bf0e3f70703d2cdafc47d5e615cc7c56c70bec56b2e3297d3fa4a7a1321d649a8679614553dde8fe52ff1051dae38d5990e3744c9ca986d92187dcdbeb  gcc10-extern_YYLOC_global_declaration.patch
+edec4f825dc1a88ff50957f7350d6b30b3713444addd3a82323343893bc58fdc5e08a5f8619a5955f21817cfc1798afb12285709b561ba6d145cd07fb1e384e5  fix-asm-offset-generation-to-work-with-clang-As.patch
+47c7c7d73ab20f3b4d961cef8bab9206203f3913d5de034ab0181ac0d75f22125f9b5124a21012ff47ed7ce443fb4498b26f9f7ce6fe381bd885ce9d1c069c36  fix-register-sp-unsuitable.patch
+75545ccd0082a119b9ad95fcef3523c939a5c946f8f3a5c3dde15cee1502f6c1011050a0ad5359426f018bb7ceea1c97a28c7665941bc89f365c8d11065ce0f6  linux3.7to4.5-ARM64-remove-Sun-Solaris-style-flag-on-section.patch
+75d071d29ceedf17e2699e3f71cf1f4ba719d64ec329f0d2b7dfaf9961d7a9a5dd7e076c9bc01dd47ba2186957993d8bc65a5faa87b7c7e641893ee3cb0a6958  0001-target-aarch64-assembly-with-llvm-on-arm64.patch
+"

device/testing/linux-amazon-douglas/fix-asm-offset-generation-to-work-with-clang-As.patch

@@ -0,0 +1 @@
+../../.shared-patches/linux/fix-asm-offset-generation-to-work-with-clang-As.patch

device/testing/linux-amazon-douglas/fix-register-sp-unsuitable.patch

@@ -0,0 +1 @@
+../../.shared-patches/linux/fix-register-sp-unsuitable.patch

device/testing/linux-amazon-douglas/linux3.7to4.5-ARM64-remove-Sun-Solaris-style-flag-on-section.patch

@@ -0,0 +1 @@
+../../.shared-patches/linux/linux3.7to4.5-ARM64-remove-Sun-Solaris-style-flag-on-section.patch

device/testing/linux-samsung-a20/APKBUILD

@@ -11,14 +11,7 @@ _flavor="samsung-a20"
 url="https://kernel.org"
 license="GPL-2.0-only"
 options="!strip !check !tracedeps pmb:cross-native"
-makedepends="bash bc bison devicepkg-dev flex openssl-dev perl gcc6"
-
-# Compiler: GCC 6 (doesn't boot when compiled with newer versions)
-if [ "${CC:0:5}" != "gcc6-" ]; then
-	CC="gcc6-$CC"
-	HOSTCC="gcc6-gcc"
-	CROSS_COMPILE="gcc6-$CROSS_COMPILE"
-fi
+makedepends="bash bc bison clang devicepkg-dev flex lld llvm openssl-dev perl python3"
 
 # Source
 _repository="kernel_samsung_a20"
@@ -38,7 +31,10 @@ prepare() {
 
 build() {
 	unset LDFLAGS
-	make O="$_outdir" ARCH="$_carch" CC="${CC:-gcc}" \
+	make O="$_outdir" ARCH="$_carch" \
+	  CC=clang AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \
+    OBJDUMP=llvm-objdump READELF=llvm-readelf \
+    HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar \
 		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS"
 }