/* ====================================================================
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* Copyright (c) 1998-2011 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com). */
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#ifndef OPENSSL_HEADER_ARM_ARCH_H
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#define OPENSSL_HEADER_ARM_ARCH_H
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#if !defined(__ARM_ARCH__)
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# if defined(__CC_ARM)
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# define __ARM_ARCH__ __TARGET_ARCH_ARM
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# if defined(__BIG_ENDIAN)
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# define __ARMEB__
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# else
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# define __ARMEL__
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# endif
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# elif defined(__GNUC__)
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# if defined(__aarch64__)
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# define __ARM_ARCH__ 8
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# if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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# define __ARMEB__
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# else
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# define __ARMEL__
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# endif
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// Why doesn't gcc define __ARM_ARCH__? Instead it defines
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// bunch of below macros. See all_architectires[] table in
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// gcc/config/arm/arm.c. On a side note it defines
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// __ARMEL__/__ARMEB__ for little-/big-endian.
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# elif defined(__ARM_ARCH)
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# define __ARM_ARCH__ __ARM_ARCH
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# elif defined(__ARM_ARCH_8A__)
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# define __ARM_ARCH__ 8
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# elif defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || \
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defined(__ARM_ARCH_7R__)|| defined(__ARM_ARCH_7M__) || \
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defined(__ARM_ARCH_7EM__)
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# define __ARM_ARCH__ 7
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# elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || \
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defined(__ARM_ARCH_6K__)|| defined(__ARM_ARCH_6M__) || \
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defined(__ARM_ARCH_6Z__)|| defined(__ARM_ARCH_6ZK__) || \
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defined(__ARM_ARCH_6T2__)
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# define __ARM_ARCH__ 6
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# elif defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) || \
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defined(__ARM_ARCH_5E__)|| defined(__ARM_ARCH_5TE__) || \
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defined(__ARM_ARCH_5TEJ__)
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# define __ARM_ARCH__ 5
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# elif defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__)
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# define __ARM_ARCH__ 4
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# else
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# error "unsupported ARM architecture"
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# endif
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# endif
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#endif
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// Even when building for 32-bit ARM, support for aarch64 crypto instructions
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// will be included.
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#define __ARM_MAX_ARCH__ 8
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// ARMV7_NEON is true when a NEON unit is present in the current CPU.
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#define ARMV7_NEON (1 << 0)
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// ARMV8_AES indicates support for hardware AES instructions.
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#define ARMV8_AES (1 << 2)
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// ARMV8_SHA1 indicates support for hardware SHA-1 instructions.
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#define ARMV8_SHA1 (1 << 3)
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// ARMV8_SHA256 indicates support for hardware SHA-256 instructions.
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#define ARMV8_SHA256 (1 << 4)
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// ARMV8_PMULL indicates support for carryless multiplication.
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#define ARMV8_PMULL (1 << 5)
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#if defined(__ASSEMBLER__)
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// Support macros for
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// - Armv8.3-A Pointer Authentication and
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// - Armv8.5-A Branch Target Identification
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// features which require emitting a .note.gnu.property section with the
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// appropriate architecture-dependent feature bits set.
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//
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// |AARCH64_SIGN_LINK_REGISTER| and |AARCH64_VALIDATE_LINK_REGISTER| expand to
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// PACIxSP and AUTIxSP, respectively. |AARCH64_SIGN_LINK_REGISTER| should be
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// used immediately before saving the LR register (x30) to the stack.
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// |AARCH64_VALIDATE_LINK_REGISTER| should be used immediately after restoring
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// it. Note |AARCH64_SIGN_LINK_REGISTER|'s modifications to LR must be undone
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// with |AARCH64_VALIDATE_LINK_REGISTER| before RET. The SP register must also
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// have the same value at the two points. For example:
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//
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// .global f
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// f:
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// AARCH64_SIGN_LINK_REGISTER
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// stp x29, x30, [sp, #-96]!
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// mov x29, sp
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// ...
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// ldp x29, x30, [sp], #96
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// AARCH64_VALIDATE_LINK_REGISTER
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// ret
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//
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// |AARCH64_VALID_CALL_TARGET| expands to BTI 'c'. Either it, or
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// |AARCH64_SIGN_LINK_REGISTER|, must be used at every point that may be an
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// indirect call target. In particular, all symbols exported from a file must
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// begin with one of these macros. For example, a leaf function that does not
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// save LR can instead use |AARCH64_VALID_CALL_TARGET|:
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//
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// .globl return_zero
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// return_zero:
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// AARCH64_VALID_CALL_TARGET
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// mov x0, #0
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// ret
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//
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// A non-leaf function which does not immediately save LR may need both macros
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// because |AARCH64_SIGN_LINK_REGISTER| appears late. For example, the function
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// may jump to an alternate implementation before setting up the stack:
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//
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// .globl with_early_jump
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// with_early_jump:
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// AARCH64_VALID_CALL_TARGET
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// cmp x0, #128
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// b.lt .Lwith_early_jump_128
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// AARCH64_SIGN_LINK_REGISTER
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// stp x29, x30, [sp, #-96]!
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// mov x29, sp
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// ...
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// ldp x29, x30, [sp], #96
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// AARCH64_VALIDATE_LINK_REGISTER
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// ret
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//
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// .Lwith_early_jump_128:
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// ...
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// ret
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//
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// These annotations are only required with indirect calls. Private symbols that
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// are only the target of direct calls do not require annotations. Also note
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// that |AARCH64_VALID_CALL_TARGET| is only valid for indirect calls (BLR), not
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// indirect jumps (BR). Indirect jumps in assembly are currently not supported
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// and would require a macro for BTI 'j'.
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//
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// Although not necessary, it is safe to use these macros in 32-bit ARM
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// assembly. This may be used to simplify dual 32-bit and 64-bit files.
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//
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// References:
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// - "ELF for the Arm® 64-bit Architecture"
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// https://github.com/ARM-software/abi-aa/blob/master/aaelf64/aaelf64.rst
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// - "Providing protection for complex software"
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// https://developer.arm.com/architectures/learn-the-architecture/providing-protection-for-complex-software
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#if defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT == 1
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#define GNU_PROPERTY_AARCH64_BTI (1 << 0) // Has Branch Target Identification
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#define AARCH64_VALID_CALL_TARGET hint #34 // BTI 'c'
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#else
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#define GNU_PROPERTY_AARCH64_BTI 0 // No Branch Target Identification
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#define AARCH64_VALID_CALL_TARGET
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#endif
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#if defined(__ARM_FEATURE_PAC_DEFAULT) && \
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(__ARM_FEATURE_PAC_DEFAULT & 1) == 1 // Signed with A-key
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#define GNU_PROPERTY_AARCH64_POINTER_AUTH \
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(1 << 1) // Has Pointer Authentication
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#define AARCH64_SIGN_LINK_REGISTER hint #25 // PACIASP
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#define AARCH64_VALIDATE_LINK_REGISTER hint #29 // AUTIASP
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#elif defined(__ARM_FEATURE_PAC_DEFAULT) && \
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(__ARM_FEATURE_PAC_DEFAULT & 2) == 2 // Signed with B-key
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#define GNU_PROPERTY_AARCH64_POINTER_AUTH \
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(1 << 1) // Has Pointer Authentication
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#define AARCH64_SIGN_LINK_REGISTER hint #27 // PACIBSP
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#define AARCH64_VALIDATE_LINK_REGISTER hint #31 // AUTIBSP
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#else
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#define GNU_PROPERTY_AARCH64_POINTER_AUTH 0 // No Pointer Authentication
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#if GNU_PROPERTY_AARCH64_BTI != 0
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#define AARCH64_SIGN_LINK_REGISTER AARCH64_VALID_CALL_TARGET
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#else
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#define AARCH64_SIGN_LINK_REGISTER
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#endif
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#define AARCH64_VALIDATE_LINK_REGISTER
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#endif
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#if GNU_PROPERTY_AARCH64_POINTER_AUTH != 0 || GNU_PROPERTY_AARCH64_BTI != 0
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.pushsection .note.gnu.property, "a";
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.balign 8;
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.long 4;
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.long 0x10;
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.long 0x5;
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.asciz "GNU";
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.long 0xc0000000; /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */
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.long 4;
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.long (GNU_PROPERTY_AARCH64_POINTER_AUTH | GNU_PROPERTY_AARCH64_BTI);
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.long 0;
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.popsection;
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#endif
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#endif /* defined __ASSEMBLER__ */
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#endif // OPENSSL_HEADER_ARM_ARCH_H
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