83 lines
2.5 KiB
ArmAsm
83 lines
2.5 KiB
ArmAsm
# Copyright (C) 2001-2017 Free Software Foundation, Inc.
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# Written By Nick Clifton
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#
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# This file is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 3, or (at your option) any
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# later version.
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#
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# This file is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# Under Section 7 of GPL version 3, you are granted additional
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# permissions described in the GCC Runtime Library Exception, version
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# 3.1, as published by the Free Software Foundation.
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#
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# You should have received a copy of the GNU General Public License and
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# a copy of the GCC Runtime Library Exception along with this program;
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# see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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# <http://www.gnu.org/licenses/>.
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/* An executable stack is *not* required for these functions. */
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#if defined(__ELF__) && defined(__linux__)
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.section .note.GNU-stack,"",%progbits
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.previous
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#endif
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#ifdef __ARM_EABI__
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/* Some attributes that are common to all routines in this file. */
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/* Tag_ABI_align_needed: This code does not require 8-byte
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alignment from the caller. */
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/* .eabi_attribute 24, 0 -- default setting. */
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/* Tag_ABI_align_preserved: This code preserves 8-byte
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alignment in any callee. */
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.eabi_attribute 25, 1
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#endif /* __ARM_EABI__ */
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# This file just makes sure that the .fini and .init sections do in
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# fact return. Users may put any desired instructions in those sections.
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# This file is the last thing linked into any executable.
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# Note - this macro is complemented by the FUNC_START macro
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# in crti.S. If you change this macro you must also change
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# that macro match.
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#
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# Note - we do not try any fancy optimizations of the return
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# sequences here, it is just not worth it. Instead keep things
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# simple. Restore all the save registers, including the link
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# register and then perform the correct function return instruction.
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# We also save/restore r3 to ensure stack alignment.
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.macro FUNC_END
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#ifdef __thumb__
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.thumb
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pop {r3, r4, r5, r6, r7}
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pop {r3}
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mov lr, r3
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#else
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.arm
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sub sp, fp, #40
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ldmfd sp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, lr}
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#endif
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#if defined __THUMB_INTERWORK__ || defined __thumb__
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bx lr
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#else
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mov pc, lr
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#endif
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.endm
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.section ".init"
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;;
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FUNC_END
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.section ".fini"
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;;
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FUNC_END
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# end of crtn.S
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