108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2023 ARM Ltd.
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*/
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#ifndef __ASM_GCS_H
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#define __ASM_GCS_H
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#include <asm/types.h>
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#include <asm/uaccess.h>
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struct kernel_clone_args;
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struct ksignal;
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static inline void gcsb_dsync(void)
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{
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asm volatile(".inst 0xd503227f" : : : "memory");
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}
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static inline void gcsstr(u64 *addr, u64 val)
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{
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register u64 *_addr __asm__ ("x0") = addr;
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register long _val __asm__ ("x1") = val;
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/* GCSSTTR x1, x0 */
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asm volatile(
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".inst 0xd91f1c01\n"
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:
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: "rZ" (_val), "r" (_addr)
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: "memory");
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}
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static inline void gcsss1(u64 Xt)
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{
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asm volatile (
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"sys #3, C7, C7, #2, %0\n"
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:
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: "rZ" (Xt)
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: "memory");
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}
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static inline u64 gcsss2(void)
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{
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u64 Xt;
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asm volatile(
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"SYSL %0, #3, C7, C7, #3\n"
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: "=r" (Xt)
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:
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: "memory");
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return Xt;
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}
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#define PR_SHADOW_STACK_SUPPORTED_STATUS_MASK \
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(PR_SHADOW_STACK_ENABLE | PR_SHADOW_STACK_WRITE | PR_SHADOW_STACK_PUSH)
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#ifdef CONFIG_ARM64_GCS
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static inline bool task_gcs_el0_enabled(struct task_struct *task)
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{
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return current->thread.gcs_el0_mode & PR_SHADOW_STACK_ENABLE;
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}
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void gcs_set_el0_mode(struct task_struct *task);
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void gcs_free(struct task_struct *task);
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void gcs_preserve_current_state(void);
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unsigned long gcs_alloc_thread_stack(struct task_struct *tsk,
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const struct kernel_clone_args *args);
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static inline int gcs_check_locked(struct task_struct *task,
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unsigned long new_val)
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{
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unsigned long cur_val = task->thread.gcs_el0_mode;
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cur_val &= task->thread.gcs_el0_locked;
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new_val &= task->thread.gcs_el0_locked;
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if (cur_val != new_val)
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return -EBUSY;
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return 0;
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}
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#else
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static inline bool task_gcs_el0_enabled(struct task_struct *task)
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{
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return false;
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}
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static inline void gcs_set_el0_mode(struct task_struct *task) { }
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static inline void gcs_free(struct task_struct *task) { }
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static inline void gcs_preserve_current_state(void) { }
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static inline unsigned long gcs_alloc_thread_stack(struct task_struct *tsk,
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const struct kernel_clone_args *args)
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{
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return -ENOTSUPP;
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}
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static inline int gcs_check_locked(struct task_struct *task,
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unsigned long new_val)
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{
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return 0;
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}
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#endif
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#endif
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