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ARM: entry: allow ARM-private syscalls to be restarted

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System calls will only be restarted after signal handling if they (a)
return an error code indicating that a restart is required and (b) have
`why' set to a non-zero value, to indicate that the signal interrupted
them.

This patch leaves `why' set to a non-zero value for ARM-private syscalls
, and only zeroes it for syscalls that are not implemented.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2013-05-13 19:16:34 +01:00
parent 3b2f64d00c
commit 377747c406
1 changed files with 2 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
arch/arm/kernel/entry-common.S
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@ -442,10 +442,10 @@ local_restart:
ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
add r1, sp, #S_OFF add r1, sp, #S_OFF
2: mov why, #0 @ no longer a real syscall
cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE)
eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back
bcs arm_syscall bcs arm_syscall
2: mov why, #0 @ no longer a real syscall
b sys_ni_syscall @ not private func b sys_ni_syscall @ not private func
#if defined(CONFIG_OABI_COMPAT) || !defined(CONFIG_AEABI) #if defined(CONFIG_OABI_COMPAT) || !defined(CONFIG_AEABI)