| 1 | /* |
| 2 | * AArch64 gcs functions for linux-user |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 5 | */ |
| 6 | #ifndef AARCH64_GCS_INTERNAL_H |
| 7 | #define AARCH64_GCS_INTERNAL_H |
| 8 | |
| 9 | #ifndef PR_SHADOW_STACK_ENABLE |
| 10 | # define PR_SHADOW_STACK_ENABLE (1U << 0) |
| 11 | # define PR_SHADOW_STACK_WRITE (1U << 1) |
| 12 | # define PR_SHADOW_STACK_PUSH (1U << 2) |
| 13 | #endif |
| 14 | |
| 15 | static inline uint64_t gcs_get_el0_mode(CPUArchState *env) |
| 16 | { |
| 17 | uint64_t cr = env->cp15.gcscr_el[0]; |
| 18 | abi_ulong flags = 0; |
| 19 | |
| 20 | flags |= cr & GCSCR_PCRSEL ? PR_SHADOW_STACK_ENABLE : 0; |
| 21 | flags |= cr & GCSCR_STREN ? PR_SHADOW_STACK_WRITE : 0; |
| 22 | flags |= cr & GCSCR_PUSHMEN ? PR_SHADOW_STACK_PUSH : 0; |
| 23 | |
| 24 | return flags; |
| 25 | } |
| 26 | |
| 27 | static inline void gcs_set_el0_mode(CPUArchState *env, uint64_t flags) |
| 28 | { |
| 29 | uint64_t cr = GCSCRE0_NTR; |
| 30 | |
| 31 | cr |= flags & PR_SHADOW_STACK_ENABLE ? GCSCR_RVCHKEN | GCSCR_PCRSEL : 0; |
| 32 | cr |= flags & PR_SHADOW_STACK_WRITE ? GCSCR_STREN : 0; |
| 33 | cr |= flags & PR_SHADOW_STACK_PUSH ? GCSCR_PUSHMEN : 0; |
| 34 | |
| 35 | env->cp15.gcscr_el[0] = cr; |
| 36 | } |
| 37 | |
| 38 | #endif |