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// $OpenBSD: s2n_bignum_internal.h,v 1.5 2025/08/12 10:01:37 jsing Exp $
//
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#ifdef __APPLE__
# define S2N_BN_SYMBOL(NAME) _##NAME
# if defined(__AARCH64EL__) || defined(__ARMEL__)
# define __LF %%
# else
# define __LF ;
# endif
#else
# define S2N_BN_SYMBOL(name) name
# define __LF ;
#endif
#define S2N_BN_SYM_VISIBILITY_DIRECTIVE(name) .globl S2N_BN_SYMBOL(name)
#ifdef S2N_BN_HIDE_SYMBOLS
# ifdef __APPLE__
# define S2N_BN_SYM_PRIVACY_DIRECTIVE(name) .private_extern S2N_BN_SYMBOL(name)
# else
# define S2N_BN_SYM_PRIVACY_DIRECTIVE(name) .hidden S2N_BN_SYMBOL(name)
# endif
#else
# define S2N_BN_SYM_PRIVACY_DIRECTIVE(name) /* NO-OP: S2N_BN_SYM_PRIVACY_DIRECTIVE */
#endif
// Enable indirect branch tracking support unless explicitly disabled
// with -DNO_IBT. If the platform supports CET, simply inherit this from
// the usual header. Otherwise manually define _CET_ENDBR, used at each
// x86 entry point, to be the ENDBR64 instruction, with an explicit byte
// sequence for compilers/assemblers that don't know about it. Note that
// it is safe to use ENDBR64 on all platforms, since the encoding is by
// design interpreted as a NOP on all pre-CET x86_64 processors. The only
// downside is a small increase in code size and potentially a modest
// slowdown from executing one more instruction.
#if NO_IBT
# if defined(_CET_ENDBR)
# error "The s2n-bignum build option NO_IBT was configured, but _CET_ENDBR is defined in this compilation unit. That is weird, so failing the build."
# endif
# define _CET_ENDBR
#elif defined(__CET__)
# include <cet.h>
#elif !defined(_CET_ENDBR)
# define _CET_ENDBR .byte 0xf3,0x0f,0x1e,0xfa
#endif
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