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boringssl/include/openssl/arm_arch.h

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