PATCH] arm: Assembly implementation cleanup

This patch removes arm assembly implementation of mmap and mmap64.
The new implementation used is the wordsize-32 generic linux one.

Tested on armhf.

--

	* sysdeps/unix/sysv/linux/arm/mmap.c: Add file.
	* sysdeps/unix/sysv/linux/arm/mmap.S: Remove file.
	* sysdeps/unix/sysv/linux/arm/mmap64.S: Likewise.

--

Ping.

On 06-07-2015 10:22, Adhemerval Zanella wrote:
> This patch removes arm assembly implementation of mmap and mmap64.
> The new implementation used is the wordsize-32 generic linux one.
> 
> Tested on armhf.
> 
> --
> 
> 	* sysdeps/unix/sysv/linux/arm/mmap.c: Add file.
> 	* sysdeps/unix/sysv/linux/arm/mmap.S: Remove file.
> 	* sysdeps/unix/sysv/linux/arm/mmap64.S: Likewise.
> 
> --
> 
> diff --git a/sysdeps/unix/sysv/linux/arm/mmap.S b/sysdeps/unix/sysv/linux/arm/mmap.S
> deleted file mode 100644
> index 4fb5bf4..0000000
> --- a/sysdeps/unix/sysv/linux/arm/mmap.S
> +++ /dev/null
> @@ -1,64 +0,0 @@
> -/* Copyright (C) 1998-2015 Free Software Foundation, Inc.
> -   This file is part of the GNU C Library.
> -
> -   The GNU C Library is free software; you can redistribute it and/or
> -   modify it under the terms of the GNU Lesser General Public
> -   License as published by the Free Software Foundation; either
> -   version 2.1 of the License, or (at your option) any later version.
> -
> -   The GNU C Library is distributed in the hope that it will be useful,
> -   but WITHOUT ANY WARRANTY; without even the implied warranty of
> -   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> -   Lesser General Public License for more details.
> -
> -   You should have received a copy of the GNU Lesser General Public
> -   License along with the GNU C Library.  If not, see
> -   <http://www.gnu.org/licenses/>.  */
> -
> -#include <sysdep.h>
> -
> -#define	EINVAL		22
> -
> -	.text
> -
> -ENTRY (__mmap)
> -	/* shuffle args */
> -	push	{ r5 }
> -	cfi_adjust_cfa_offset (4)
> -	cfi_rel_offset (r5, 0)
> -	ldr	r5, [sp, #8]
> -	push	{ r4 }
> -	cfi_adjust_cfa_offset (4)
> -	cfi_rel_offset (r4, 0)
> -	cfi_remember_state
> -	ldr	r4, [sp, #8]
> -
> -	/* convert offset to pages */
> -	movs	ip, r5, lsl #20
> -	bne	.Linval
> -	mov	r5, r5, lsr #12
> -
> -	/* do the syscall */
> -	DO_CALL (mmap2, 0)
> -
> -	/* restore registers */
> -2:
> -	pop	{ r4 }
> -	cfi_adjust_cfa_offset (-4)
> -	cfi_restore (r4)
> -	pop	{ r5 }
> -	cfi_adjust_cfa_offset (-4)
> -	cfi_restore (r5)
> -
> -	cmn	r0, $4096
> -	it	cc
> -	RETINSTR(cc, lr)
> -	b	PLTJMP(syscall_error)
> -
> -	cfi_restore_state
> -.Linval:
> -	mov	r0, #-EINVAL
> -	b	2b
> -PSEUDO_END (__mmap)
> -
> -weak_alias (__mmap, mmap)
> diff --git a/sysdeps/unix/sysv/linux/arm/mmap.c b/sysdeps/unix/sysv/linux/arm/mmap.c
> new file mode 100644
> index 0000000..2cb4907
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arm/mmap.c
> @@ -0,0 +1,18 @@
> +/* Copyright (C) 2015 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include <sysdeps/unix/sysv/linux/generic/wordsize-32/mmap.c>
> diff --git a/sysdeps/unix/sysv/linux/arm/mmap64.S b/sysdeps/unix/sysv/linux/arm/mmap64.S
> deleted file mode 100644
> index d574df0..0000000
> --- a/sysdeps/unix/sysv/linux/arm/mmap64.S
> +++ /dev/null
> @@ -1,72 +0,0 @@
> -/* Copyright (C) 2000-2015 Free Software Foundation, Inc.
> -   This file is part of the GNU C Library.
> -
> -   The GNU C Library is free software; you can redistribute it and/or
> -   modify it under the terms of the GNU Lesser General Public
> -   License as published by the Free Software Foundation; either
> -   version 2.1 of the License, or (at your option) any later version.
> -
> -   The GNU C Library is distributed in the hope that it will be useful,
> -   but WITHOUT ANY WARRANTY; without even the implied warranty of
> -   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> -   Lesser General Public License for more details.
> -
> -   You should have received a copy of the GNU Lesser General Public
> -   License along with the GNU C Library.  If not, see
> -   <http://www.gnu.org/licenses/>.  */
> -
> -#include <sysdep.h>
> -
> -	.syntax unified
> -
> -#define	EINVAL		22
> -
> -#ifdef __ARMEB__
> -# define LOW_OFFSET      8 + 4
> -/* The initial + 4 is for the stack postdecrement.  */
> -# define HIGH_OFFSET 4 + 8 + 0
> -#else
> -# define LOW_OFFSET      8 + 0
> -# define HIGH_OFFSET 4 + 8 + 4
> -#endif
> -
> -	/* The mmap2 system call takes six arguments, all in registers.  */
> -	.text
> -ENTRY (__mmap64)
> -	ldr	ip, [sp, $LOW_OFFSET]
> -	push	{ r5 }
> -	cfi_adjust_cfa_offset (4)
> -	cfi_rel_offset (r5, 0)
> -	ldr	r5, [sp, $HIGH_OFFSET]
> -	push	{ r4 }
> -	cfi_adjust_cfa_offset (4)
> -	cfi_rel_offset (r4, 0)
> -	cfi_remember_state
> -	movs	r4, ip, lsl $20		@ check that offset is page-aligned
> -	mov	ip, ip, lsr $12
> -	it	eq
> -	movseq	r4, r5, lsr $12		@ check for overflow
> -	bne	.Linval
> -	ldr	r4, [sp, $8]		@ load fd
> -	orr	r5, ip, r5, lsl $20	@ compose page offset
> -	DO_CALL (mmap2, 0)
> -	cmn	r0, $4096
> -	pop	{r4, r5}
> -	cfi_adjust_cfa_offset (-8)
> -	cfi_restore (r4)
> -	cfi_restore (r5)
> -	it	cc
> -	RETINSTR(cc, lr)
> -	b	PLTJMP(syscall_error)
> -
> -	cfi_restore_state
> -.Linval:
> -	mov	r0, $-EINVAL
> -	pop	{r4, r5}
> -	cfi_adjust_cfa_offset (-8)
> -	cfi_restore (r4)
> -	cfi_restore (r5)
> -	b	PLTJMP(syscall_error)
> -PSEUDO_END (__mmap64)
> -
> -weak_alias (__mmap64, mmap64)
>

Pushed upstream as 2aa6c8af26e65695e9daf382a6e508574a30cdf2.

On 22-07-2015 10:43, Joseph Myers wrote:
> On Mon, 6 Jul 2015, Adhemerval Zanella wrote:
> 
>> This patch removes arm assembly implementation of mmap and mmap64.
>> The new implementation used is the wordsize-32 generic linux one.
>>
>> Tested on armhf.
>>
>> --
>>
>> 	* sysdeps/unix/sysv/linux/arm/mmap.c: Add file.
>> 	* sysdeps/unix/sysv/linux/arm/mmap.S: Remove file.
>> 	* sysdeps/unix/sysv/linux/arm/mmap64.S: Likewise.
> 
> OK for 2.23 (once 2.22 has branched).
>