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arm64: compat: Remove 32-bit sigreturn code from the vDSO 

The sigreturn code in the compat vDSO is unused. Remove it.

Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2020-06-22 13:13:58 +01:00
parent 8e411be6aa
commit 2d071968a4
3 changed files with 0 additions and 71 deletions
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1
arch/arm64/kernel/vdso32/Makefile
View File

@ -140,7 +140,6 @@ hostprogs := $(munge)
c-obj-vdso := note.o
c-obj-vdso-gettimeofday := vgettimeofday.o
asm-obj-vdso := sigreturn.o
ifneq ($(c-gettimeofday-y),)
VDSO_CFLAGS_gettimeofday_o += -include $(c-gettimeofday-y)

58
arch/arm64/kernel/vdso32/sigreturn.S
View File

@ -1,58 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* This file provides both A32 and T32 versions, in accordance with the
* arm sigreturn code.
*
* Please read the comments in arch/arm64/kernel/vdso/sigreturn.S to
* understand some of the craziness in here.
*
* Copyright (C) 2018 ARM Limited
*/
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/unistd.h>
.text
.arm
.fnstart
.save {r0-r15}
.pad #COMPAT_SIGFRAME_REGS_OFFSET
nop
SYM_CODE_START(__kernel_sigreturn_arm)
mov r7, #__NR_compat_sigreturn
svc #0
.fnend
SYM_CODE_END(__kernel_sigreturn_arm)
.fnstart
.save {r0-r15}
.pad #COMPAT_RT_SIGFRAME_REGS_OFFSET
nop
SYM_CODE_START(__kernel_rt_sigreturn_arm)
mov r7, #__NR_compat_rt_sigreturn
svc #0
.fnend
SYM_CODE_END(__kernel_rt_sigreturn_arm)
.thumb
.fnstart
.save {r0-r15}
.pad #COMPAT_SIGFRAME_REGS_OFFSET
nop
SYM_CODE_START(__kernel_sigreturn_thumb)
mov r7, #__NR_compat_sigreturn
svc #0
.fnend
SYM_CODE_END(__kernel_sigreturn_thumb)
.fnstart
.save {r0-r15}
.pad #COMPAT_RT_SIGFRAME_REGS_OFFSET
nop
SYM_CODE_START(__kernel_rt_sigreturn_thumb)
mov r7, #__NR_compat_rt_sigreturn
svc #0
.fnend
SYM_CODE_END(__kernel_rt_sigreturn_thumb)

12
arch/arm64/kernel/vdso32/vdso.lds.S
View File

@ -64,19 +64,7 @@ VERSION
__vdso_clock_gettime;
__vdso_gettimeofday;
__vdso_clock_getres;
__kernel_sigreturn_arm;
__kernel_sigreturn_thumb;
__kernel_rt_sigreturn_arm;
__kernel_rt_sigreturn_thumb;
__vdso_clock_gettime64;
local: *;
};
}
/*
* Make the sigreturn code visible to the kernel.
*/
VDSO_compat_sigreturn_arm = __kernel_sigreturn_arm;
VDSO_compat_sigreturn_thumb = __kernel_sigreturn_thumb;
VDSO_compat_rt_sigreturn_arm = __kernel_rt_sigreturn_arm;
VDSO_compat_rt_sigreturn_thumb = __kernel_rt_sigreturn_thumb;