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| -rw-r--r-- | sysdeps/aarch64/morello/cheri_perms.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/sysdeps/aarch64/morello/cheri_perms.h b/sysdeps/aarch64/morello/cheri_perms.h new file mode 100644 index 0000000000..98a1926ad9 --- /dev/null +++ b/sysdeps/aarch64/morello/cheri_perms.h @@ -0,0 +1,84 @@ +/* Copyright (C) 2022 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#ifndef _AARCH64_MORELLO_CHERI_PERMS_H +#define _AARCH64_MORELLO_CHERI_PERMS_H + +/* Capability permission bits. These are defined in the Arm Architecture + Reference Manual Suplement- Morello for A-Profile Architecture: + https://developer.arm.com/documentation/ddi0606/latest */ +#define CAP_PERM_LOAD (1 << 17) +#define CAP_PERM_STORE (1 << 16) +#define CAP_PERM_EXECUTE (1 << 15) +#define CAP_PERM_LOAD_CAP (1 << 14) +#define CAP_PERM_STORE_CAP (1 << 13) +#define CAP_PERM_STORE_LOCAL (1 << 12) +#define CAP_PERM_SEAL (1 << 11) +#define CAP_PERM_UNSEAL (1 << 10) +#define CAP_PERM_SYSTEM (1 << 9) +#define CAP_PERM_BRANCH_SEALED_PAIR (1 << 8) +#define CAP_PERM_COMPARTMENT_ID (1 << 7) +#define CAP_PERM_MUTABLE_LOAD (1 << 6) +#define CAP_PERM_EXECUTIVE (1 << 1) +#define CAP_PERM_GLOBAL (1 << 0) + +/* Used with __builtin_cheri_perms_and. */ +#define CAP_PERM_MASK_BASE (-1UL ^ ( \ + CAP_PERM_LOAD | \ + CAP_PERM_STORE | \ + CAP_PERM_EXECUTE | \ + CAP_PERM_LOAD_CAP | \ + CAP_PERM_MUTABLE_LOAD | \ + CAP_PERM_STORE_CAP | \ + CAP_PERM_STORE_LOCAL | \ + CAP_PERM_EXECUTIVE | \ + CAP_PERM_SYSTEM | \ + CAP_PERM_SEAL | \ + CAP_PERM_UNSEAL | \ + CAP_PERM_COMPARTMENT_ID)) +#define CAP_PERM_MASK_R ( \ + CAP_PERM_MASK_BASE | \ + CAP_PERM_LOAD | \ + CAP_PERM_LOAD_CAP | \ + CAP_PERM_MUTABLE_LOAD) +#define CAP_PERM_MASK_RW ( \ + CAP_PERM_MASK_R | \ + CAP_PERM_STORE | \ + CAP_PERM_STORE_CAP | \ + CAP_PERM_STORE_LOCAL) +#define CAP_PERM_MASK_RX ( \ + CAP_PERM_MASK_R | \ + CAP_PERM_EXECUTE | \ + CAP_PERM_EXECUTIVE | \ + CAP_PERM_SYSTEM) + +#define STACK_CAP_PERM_PCS ( \ + CAP_PERM_LOAD | \ + CAP_PERM_STORE | \ + CAP_PERM_LOAD_CAP | \ + CAP_PERM_STORE_CAP | \ + CAP_PERM_MUTABLE_LOAD) + +/* Check if stack is valid according to stack PCS rules. Only permissions + are checked, seal and invalid tag cause fault on access. */ +#define STACK_CAP_CHECK(stack, size) \ + ({unsigned long __perm = __builtin_cheri_perms_get (stack); \ + (__perm & (CAP_PERM_GLOBAL|CAP_PERM_STORE_LOCAL)) \ + && (__perm & STACK_CAP_PERM_PCS) == STACK_CAP_PERM_PCS;}) + +#endif |