99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
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/*
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* Macros for asm code.
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*
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* Copyright (c) 2019-2020, Arm Limited.
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* SPDX-License-Identifier: MIT
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*/
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#ifndef _ASMDEFS_H
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#define _ASMDEFS_H
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#if defined(__aarch64__)
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/* Branch Target Identitication support. */
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#define BTI_C hint 34
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#define BTI_J hint 36
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/* Return address signing support (pac-ret). */
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#define PACIASP hint 25; .cfi_window_save
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#define AUTIASP hint 29; .cfi_window_save
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/* GNU_PROPERTY_AARCH64_* macros from elf.h. */
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#define FEATURE_1_AND 0xc0000000
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#define FEATURE_1_BTI 1
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#define FEATURE_1_PAC 2
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/* Add a NT_GNU_PROPERTY_TYPE_0 note. */
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#define GNU_PROPERTY(type, value) \
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.section .note.gnu.property, "a"; \
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.p2align 3; \
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.word 4; \
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.word 16; \
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.word 5; \
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.asciz "GNU"; \
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.word type; \
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.word 4; \
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.word value; \
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.word 0; \
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.text
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/* If set then the GNU Property Note section will be added to
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mark objects to support BTI and PAC-RET. */
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#ifndef WANT_GNU_PROPERTY
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#define WANT_GNU_PROPERTY 1
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#endif
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#if WANT_GNU_PROPERTY
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/* Add property note with supported features to all asm files. */
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GNU_PROPERTY (FEATURE_1_AND, FEATURE_1_BTI|FEATURE_1_PAC)
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#endif
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#define ENTRY_ALIGN(name, alignment) \
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.global name; \
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.type name,%function; \
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.align alignment; \
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name: \
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.cfi_startproc; \
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BTI_C;
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#else
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#define END_FILE
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#define ENTRY_ALIGN(name, alignment) \
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.global name; \
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.type name,%function; \
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.align alignment; \
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name: \
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.cfi_startproc;
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#endif
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#define ENTRY(name) ENTRY_ALIGN(name, 6)
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#define ENTRY_ALIAS(name) \
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.global name; \
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.type name,%function; \
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name:
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#define END(name) \
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.cfi_endproc; \
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.size name, .-name;
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#define L(l) .L ## l
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#ifdef __ILP32__
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/* Sanitize padding bits of pointer arguments as per aapcs64 */
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#define PTR_ARG(n) mov w##n, w##n
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#else
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#define PTR_ARG(n)
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#endif
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#ifdef __ILP32__
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/* Sanitize padding bits of size arguments as per aapcs64 */
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#define SIZE_ARG(n) mov w##n, w##n
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#else
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#define SIZE_ARG(n)
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#endif
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#endif
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