101 lines
1.9 KiB
C
101 lines
1.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2023 ARM Limited.
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*/
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#ifndef GCS_UTIL_H
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#define GCS_UTIL_H
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#include <stdbool.h>
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#ifndef __NR_map_shadow_stack
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#define __NR_map_shadow_stack 453
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#endif
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#ifndef __NR_prctl
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#define __NR_prctl 167
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#endif
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#ifndef NT_ARM_GCS
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#define NT_ARM_GCS 0x410
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struct user_gcs {
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__u64 features_enabled;
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__u64 features_locked;
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__u64 gcspr_el0;
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};
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#endif
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/* Shadow Stack/Guarded Control Stack interface */
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#define PR_GET_SHADOW_STACK_STATUS 74
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#define PR_SET_SHADOW_STACK_STATUS 75
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#define PR_LOCK_SHADOW_STACK_STATUS 76
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# define PR_SHADOW_STACK_ENABLE (1UL << 0)
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# define PR_SHADOW_STACK_WRITE (1UL << 1)
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# define PR_SHADOW_STACK_PUSH (1UL << 2)
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#define PR_SHADOW_STACK_ALL_MODES \
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PR_SHADOW_STACK_ENABLE | PR_SHADOW_STACK_WRITE | PR_SHADOW_STACK_PUSH
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#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in the shadow stack */
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#define SHADOW_STACK_SET_MARKER (1ULL << 1) /* Set up a top of stack merker in the shadow stack */
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#define GCS_CAP_ADDR_MASK (0xfffffffffffff000UL)
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#define GCS_CAP_TOKEN_MASK (0x0000000000000fffUL)
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#define GCS_CAP_VALID_TOKEN 1
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#define GCS_CAP_IN_PROGRESS_TOKEN 5
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#define GCS_CAP(x) (((unsigned long)(x) & GCS_CAP_ADDR_MASK) | \
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GCS_CAP_VALID_TOKEN)
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static inline unsigned long *get_gcspr(void)
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{
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unsigned long *gcspr;
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asm volatile(
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"mrs %0, S3_3_C2_C5_1"
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: "=r" (gcspr)
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:
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: "cc");
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return gcspr;
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}
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static inline void __attribute__((always_inline)) gcsss1(unsigned long *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 unsigned long __attribute__((always_inline)) *gcsss2(void)
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{
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unsigned long *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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static inline bool chkfeat_gcs(void)
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{
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register long val __asm__ ("x16") = 1;
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/* CHKFEAT x16 */
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asm volatile(
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"hint #0x28\n"
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: "=r" (val)
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: "r" (val));
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return val != 1;
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}
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#endif
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