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ARM: 7895/1: signal: fix armv7-m build issue in sigreturn_codes.S 

After "ARM: signal: sigreturn_codes should be endian neutral to
work in BE8" commit, thumb only platforms, like armv7m, fails to
compile sigreturn_codes.S. The reason is that for such arch
values '.arm' directive and arm opcodes are not allowed.

Fix conditionally enables arm opcodes only if no CONFIG_CPU_THUMBONLY
defined and it uses .org instructions to keep sigreturn_codes
layout.

Suggested-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Victor Kamensky <victor.kamensky@linaro.org>
Tested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Victor Kamensky 2013-11-21 07:17:03 +01:00 committed by Russell King
parent 67130c5464
commit 50913336ef
1 changed files with 31 additions and 9 deletions
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40
arch/arm/kernel/sigreturn_codes.S
View File

@ -30,6 +30,27 @@
* snippets.
*/
/*
* In CPU_THUMBONLY case kernel arm opcodes are not allowed.
* Note in this case codes skips those instructions but it uses .org
* directive to keep correct layout of sigreturn_codes array.
*/
#ifndef CONFIG_CPU_THUMBONLY
#define ARM_OK(code...) code
#else
#define ARM_OK(code...)
#endif
.macro arm_slot n
.org sigreturn_codes + 12 * (\n)
ARM_OK( .arm )
.endm
.macro thumb_slot n
.org sigreturn_codes + 12 * (\n) + 8
.thumb
.endm
#if __LINUX_ARM_ARCH__ <= 4
/*
* Note we manually set minimally required arch that supports
@ -45,26 +66,27 @@
.global sigreturn_codes
.type sigreturn_codes, #object
.arm
.align
sigreturn_codes:
/* ARM sigreturn syscall code snippet */
mov r7, #(__NR_sigreturn - __NR_SYSCALL_BASE)
swi #(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE)
arm_slot 0
ARM_OK( mov r7, #(__NR_sigreturn - __NR_SYSCALL_BASE) )
ARM_OK( swi #(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE) )
/* Thumb sigreturn syscall code snippet */
.thumb
thumb_slot 0
movs r7, #(__NR_sigreturn - __NR_SYSCALL_BASE)
swi #0
/* ARM sigreturn_rt syscall code snippet */
.arm
mov r7, #(__NR_rt_sigreturn - __NR_SYSCALL_BASE)
swi #(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE)
arm_slot 1
ARM_OK( mov r7, #(__NR_rt_sigreturn - __NR_SYSCALL_BASE) )
ARM_OK( swi #(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE) )
/* Thumb sigreturn_rt syscall code snippet */
.thumb
thumb_slot 1
movs r7, #(__NR_rt_sigreturn - __NR_SYSCALL_BASE)
swi #0
@ -74,7 +96,7 @@ sigreturn_codes:
* it is thumb case or not, so we need additional
* word after real last entry.
*/
.arm
arm_slot 2
.space 4
.size sigreturn_codes, . - sigreturn_codes