61 lines
1.6 KiB
ArmAsm
61 lines
1.6 KiB
ArmAsm
/*
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* Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef __ASM_MACROS_COMMON_S__
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#define __ASM_MACROS_COMMON_S__
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/*
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* This macro is used to create a function label and place the
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* code into a separate text section based on the function name
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* to enable elimination of unused code during linking. It also adds
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* basic debug information to enable call stack printing most of the
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* time.
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*/
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.macro func _name
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/*
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* Add Call Frame Information entry in the .debug_frame section for
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* debugger consumption. This enables callstack printing in debuggers.
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* This does not use any space in the final loaded binary, only in the
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* ELF file.
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* Note that a function manipulating the CFA pointer location (i.e. the
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* x29 frame pointer on AArch64) should declare it using the
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* appropriate .cfi* directives, or be prepared to have a degraded
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* debugging experience.
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*/
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.cfi_sections .debug_frame
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.section .text.\_name, "ax"
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.type \_name, %function
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.func \_name
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/*
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* .cfi_startproc and .cfi_endproc are needed to output entries in
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* .debug_frame
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*/
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.cfi_startproc
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\_name:
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.endm
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/*
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* This macro is used to mark the end of a function.
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*/
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.macro endfunc _name
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.endfunc
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.cfi_endproc
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.size \_name, . - \_name
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.endm
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/*
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* Helper assembler macro to count trailing zeros. The output is
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* populated in the `TZ_COUNT` symbol.
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*/
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.macro count_tz _value, _tz_count
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.if \_value
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count_tz "(\_value >> 1)", "(\_tz_count + 1)"
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.else
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.equ TZ_COUNT, (\_tz_count - 1)
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.endif
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.endm
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#endif /* __ASM_MACROS_COMMON_S__ */
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