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/*
* Macros for pacbti asm code.
*
* Copyright (c) 2022, Arm Limited.
* SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
*/
/* Macro to handle function entry depending on branch-protection
schemes */
.macro pacbti_prologue
#if __ARM_FEATURE_PAC_DEFAULT
#if __ARM_FEATURE_BTI_DEFAULT
pacbti ip, lr, sp
#else
pac ip, lr, sp
#endif /* __ARM_FEATURE_BTI_DEFAULT */
str ip, [sp, #-4]!
.save {ra_auth_code}
.cfi_def_cfa_offset 4
.cfi_offset 143, -4
#elif __ARM_FEATURE_BTI_DEFAULT
bti
#endif /* __ARM_FEATURE_PAC_DEFAULT */
.endm
/* Macro to handle different branch exchange cases depending on
branch-protection schemes */
.macro pacbti_epilogue
#if __ARM_FEATURE_PAC_DEFAULT
ldr ip, [sp], #4
.cfi_restore 143
.cfi_def_cfa_offset 0
aut ip, lr, sp
#endif /* __ARM_FEATURE_PAC_DEFAULT */
bx lr
.endm
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