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| author | Will Deacon <will.deacon@arm.com> | 2013-09-19 09:32:20 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-09-21 19:41:25 (GMT) |
| commit | d95bc2501da97e2884b957c48df37c258a34db8d (patch) | |
| tree | e7414b8c26264cdec3b2f64317dddff0cd780aee | |
| parent | c89efa731e70a12908a0c155518ebbfd2d6ca605 (diff) | |
| download | linux-d95bc2501da97e2884b957c48df37c258a34db8d.tar.xz | |
ARM: 7839/1: entry: fix tracing of ARM-private syscalls
Commit 377747c40657 ("ARM: entry: allow ARM-private syscalls to be
restarted") reworked the low-level syscall dispatcher to allow
restarting of ARM-private syscalls. Unfortunately, this relocated the
label used to dispatch a private syscall from the trace path, so that
the invocation would be bypassed altogether!
This causes applications to fail under strace as soon as they rely on
a private syscall (e.g. set_tls):
set_tls(0xb6fad4c0, 0xb6fadb98, 0xb6fb1050, 0xb6fad4c0, 0xb6fb1050)
= -1 ENOSYS (Function not implemented)
This patch fixes the label so that we correctly dispatch private
syscalls from the trace path.
Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/kernel/entry-common.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 74ad15d1..bc6bd96 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -442,10 +442,10 @@ local_restart: ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine add r1, sp, #S_OFF - cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) +2: cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back bcs arm_syscall -2: mov why, #0 @ no longer a real syscall + mov why, #0 @ no longer a real syscall b sys_ni_syscall @ not private func #if defined(CONFIG_OABI_COMPAT) || !defined(CONFIG_AEABI) |