mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-14 06:24:53 +08:00
7f34b43e07
The newly introduced TRAMP_VALIAS definition causes a build warning
with clang-14:
arch/arm64/include/asm/vectors.h:66:31: error: arithmetic on a null pointer treated as a cast from integer to pointer is a GNU extension [-Werror,-Wnull-pointer-arithmetic]
return (char *)TRAMP_VALIAS + SZ_2K * slot;
Change the addition to something clang does not complain about.
Fixes: bd09128d16 ("arm64: Add percpu vectors for EL1")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: James Morse <james.morse@arm.com>
Link: https://lore.kernel.org/r/20220316183833.1563139-1-arnd@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2022 ARM Ltd.
|
|
*/
|
|
#ifndef __ASM_VECTORS_H
|
|
#define __ASM_VECTORS_H
|
|
|
|
#include <linux/bug.h>
|
|
#include <linux/percpu.h>
|
|
|
|
#include <asm/fixmap.h>
|
|
|
|
extern char vectors[];
|
|
extern char tramp_vectors[];
|
|
extern char __bp_harden_el1_vectors[];
|
|
|
|
/*
|
|
* Note: the order of this enum corresponds to two arrays in entry.S:
|
|
* tramp_vecs and __bp_harden_el1_vectors. By default the canonical
|
|
* 'full fat' vectors are used directly.
|
|
*/
|
|
enum arm64_bp_harden_el1_vectors {
|
|
#ifdef CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY
|
|
/*
|
|
* Perform the BHB loop mitigation, before branching to the canonical
|
|
* vectors.
|
|
*/
|
|
EL1_VECTOR_BHB_LOOP,
|
|
|
|
/*
|
|
* Make the SMC call for firmware mitigation, before branching to the
|
|
* canonical vectors.
|
|
*/
|
|
EL1_VECTOR_BHB_FW,
|
|
|
|
/*
|
|
* Use the ClearBHB instruction, before branching to the canonical
|
|
* vectors.
|
|
*/
|
|
EL1_VECTOR_BHB_CLEAR_INSN,
|
|
#endif /* CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY */
|
|
|
|
/*
|
|
* Remap the kernel before branching to the canonical vectors.
|
|
*/
|
|
EL1_VECTOR_KPTI,
|
|
};
|
|
|
|
#ifndef CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY
|
|
#define EL1_VECTOR_BHB_LOOP -1
|
|
#define EL1_VECTOR_BHB_FW -1
|
|
#define EL1_VECTOR_BHB_CLEAR_INSN -1
|
|
#endif /* !CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY */
|
|
|
|
/* The vectors to use on return from EL0. e.g. to remap the kernel */
|
|
DECLARE_PER_CPU_READ_MOSTLY(const char *, this_cpu_vector);
|
|
|
|
#ifndef CONFIG_UNMAP_KERNEL_AT_EL0
|
|
#define TRAMP_VALIAS 0ul
|
|
#endif
|
|
|
|
static inline const char *
|
|
arm64_get_bp_hardening_vector(enum arm64_bp_harden_el1_vectors slot)
|
|
{
|
|
if (arm64_kernel_unmapped_at_el0())
|
|
return (char *)(TRAMP_VALIAS + SZ_2K * slot);
|
|
|
|
WARN_ON_ONCE(slot == EL1_VECTOR_KPTI);
|
|
|
|
return __bp_harden_el1_vectors + SZ_2K * slot;
|
|
}
|
|
|
|
#endif /* __ASM_VECTORS_H */
|