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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/arch/arm64/include/asm/compiler.h
....@@ -1,30 +1,26 @@
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-/*
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- * Based on arch/arm/include/asm/compiler.h
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- *
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- * Copyright (C) 2012 ARM Ltd.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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- */
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+/* SPDX-License-Identifier: GPL-2.0 */
182 #ifndef __ASM_COMPILER_H
193 #define __ASM_COMPILER_H
204 
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-/*
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- * This is used to ensure the compiler did actually allocate the register we
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- * asked it for some inline assembly sequences.  Apparently we can't trust the
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- * compiler from one version to another so a bit of paranoia won't hurt.  This
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- * string is meant to be concatenated with the inline asm string and will
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- * cause compilation to stop on mismatch.  (for details, see gcc PR 15089)
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- */
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-#define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
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+#ifdef ARM64_ASM_ARCH
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+#define ARM64_ASM_PREAMBLE ".arch " ARM64_ASM_ARCH "\n"
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+#else
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+#define ARM64_ASM_PREAMBLE
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+#endif
2910 
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-#endif	/* __ASM_COMPILER_H */
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+/*
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+ * The EL0/EL1 pointer bits used by a pointer authentication code.
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+ * This is dependent on TBI0/TBI1 being enabled, or bits 63:56 would also apply.
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+ */
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+#define ptrauth_user_pac_mask()		GENMASK_ULL(54, vabits_actual)
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+#define ptrauth_kernel_pac_mask()	GENMASK_ULL(63, vabits_actual)
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+
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+/* Valid for EL0 TTBR0 and EL1 TTBR1 instruction pointers */
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+#define ptrauth_clear_pac(ptr)						\
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+	((ptr & BIT_ULL(55)) ? (ptr | ptrauth_kernel_pac_mask()) :	\
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+			       (ptr & ~ptrauth_user_pac_mask()))
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+
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+#define __builtin_return_address(val)					\
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+	(void *)(ptrauth_clear_pac((unsigned long)__builtin_return_address(val)))
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+
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+#endif /* __ASM_COMPILER_H */