Differential D2132 Diff 4679 lib/libc/aarch64/sys/brk.S

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lib/libc/aarch64/sys/brk.S

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				/*-
				* Copyright (c) 2014 The FreeBSD Foundation
				* All rights reserved.
				impUnsubmitted Not Done Inline Actions 2014 or 2015? I'd be inclined to go with 2015 across the board for any truly new files since they were all published in 2015 or the second half of 2014 for the first time. imp: 2014 or 2015? I'd be inclined to go with 2015 across the board for any truly new files since…
				*
				* This software was developed by Andrew Turner under
				* sponsorship from the FreeBSD Foundation.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/

				#include <machine/asm.h>
				__FBSDID("$FreeBSD$");

				#include "SYS.h"

				.data
				.align 3
				.globl _C_LABEL(minbrk)
				.type _C_LABEL(minbrk),#object
				_C_LABEL(minbrk):
				.quad _C_LABEL(_end)

				.text
				/*
				* int brk(const void *addr);
				*/
				ENTRY(_brk)
				WEAK_REFERENCE(_brk, brk)

				/* Load the address of minbrk */
				#ifdef __PIC__
				adrp x2, :got:minbrk
				ldr x3, [x2, #:got_lo12:minbrk]
				#else
				ldr x3, .Lminbrk
				#endif

				/* Get the minimum allowable brk address */
				ldr x2, [x3]

				/* Validate the address */
				cmp x0, x2
				b.ge 1f
				/* Invalid, set it to the minimum */
				mov x0, x2

				/* Backup the new address */
				1: mov x4, x0

				/* Update for this value, will overwrite x0 and x1 */
				_SYSCALL(break)
				b.cs cerror

				#ifdef __PIC__
				adrp x2, :got:curbrk
				ldr x3, [x2, #:got_lo12:curbrk]
				#else
				ldr x3, .Lcurbrk
				#endif

				/* Store the new curbrk value */
				str x4, [x3]

				/* Return success */
				mov x0, #0
				ret

				#ifndef __PIC__
				.Lcurbrk:
				.quad _C_LABEL(curbrk)
				.Lminbrk:
				.quad _C_LABEL(minbrk)
				#endif
				END(_brk)