diff options
Diffstat (limited to 'lib/libc/aarch64/sys/sbrk.S')
-rw-r--r-- | lib/libc/aarch64/sys/sbrk.S | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/lib/libc/aarch64/sys/sbrk.S b/lib/libc/aarch64/sys/sbrk.S new file mode 100644 index 0000000..db9d7e1 --- /dev/null +++ b/lib/libc/aarch64/sys/sbrk.S @@ -0,0 +1,79 @@ +/*- + * Copyright (c) 2014 The FreeBSD Foundation + * All rights reserved. + * + * 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 + .global _C_LABEL(curbrk) + .type _C_LABEL(curbrk),#object +_C_LABEL(curbrk): + .quad _C_LABEL(_end) + + .text +/* + * void *sbrk(intptr_t incr); + */ +ENTRY(_sbrk) + WEAK_REFERENCE(_sbrk, sbrk) + + /* Load the address of curbrk */ +#ifdef __PIC__ + adrp x2, :got:curbrk + ldr x3, [x2, #:got_lo12:curbrk] +#else + ldr x3, .Lcurbrk +#endif + + /* Get the current brk address */ + ldr x2, [x3] + + /* Calculate the new value */ + add x0, x2, x0 + mov x4, x0 + + /* Update for this value, will overwrite x0 and x1 */ + _SYSCALL(break) + b.cs cerror + + /* Load the old value to return */ + ldr x0, [x3] + + /* Store the new curbrk value */ + str x4, [x3] + + ret +#ifndef __PIC__ +.Lcurbrk: + .quad _C_LABEL(curbrk) +#endif +END(_sbrk) |