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1be3d6eb82
Use return address signing in assembly files for functions that save LR when pac-ret is enabled in the compiler. The GNU property note for PAC-RET is not meaningful to the dynamic linker so it is not strictly required, but it may be used to track the security property of binaries. (The PAC-RET property is only set if BTI is set too because BTI implies working GNU property support.) Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
104 lines
3.0 KiB
ArmAsm
104 lines
3.0 KiB
ArmAsm
/* Special .init and .fini section support for AArch64.
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Copyright (C) 1995-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* crti.S puts a function prologue at the beginning of the .init and
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.fini sections and defines global symbols for those addresses, so
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they can be called as functions. The symbols _init and _fini are
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magic and cause the linker to emit DT_INIT and DT_FINI. */
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#include <sysdep.h>
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#include <libc-symbols.h>
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#ifndef PREINIT_FUNCTION
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# define PREINIT_FUNCTION __gmon_start__
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#endif
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#ifndef PREINIT_FUNCTION_WEAK
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# define PREINIT_FUNCTION_WEAK 1
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#endif
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#if PREINIT_FUNCTION_WEAK
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weak_extern (PREINIT_FUNCTION)
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#else
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.hidden PREINIT_FUNCTION
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#endif
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#if PREINIT_FUNCTION_WEAK
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.align 2
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.type call_weak_fn, %function
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call_weak_fn:
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adrp x0, :got:PREINIT_FUNCTION
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ldr PTR_REG (0), [x0, #:got_lo12:PREINIT_FUNCTION]
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cbz x0, 1f
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b PREINIT_FUNCTION
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1:
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RET
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.size call_weak_fn, .-call_weak_fn
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#endif
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.section .init,"ax",%progbits
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.align 2
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.global _init
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.hidden _init
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.type _init, %function
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_init:
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#if HAVE_AARCH64_PAC_RET
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PACIASP
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#else
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BTI_C
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#endif
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stp x29, x30, [sp, -16]!
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mov x29, sp
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#if PREINIT_FUNCTION_WEAK
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bl call_weak_fn
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#else
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bl PREINIT_FUNCTION
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#endif
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.section .fini,"ax",%progbits
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.align 2
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.global _fini
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.hidden _fini
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.type _fini, %function
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_fini:
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#if HAVE_AARCH64_PAC_RET
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PACIASP
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#else
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BTI_C
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#endif
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stp x29, x30, [sp, -16]!
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mov x29, sp
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