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| author | Richard Mortimer <richm@oldelvet.org.uk> | 2006-01-09 14:35:50 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2006-01-09 14:35:50 -0800 |
| commit | 695ca07bf1036091eff2f11d2fe5f1585c2ac8c8 (patch) | |
| tree | 8d01fdce568098466d4751aaa660385f8a6cf61c | |
| parent | 90bf8116641d6c9fb6f88329634341f9a0f429c6 (diff) | |
| download | linux-695ca07bf1036091eff2f11d2fe5f1585c2ac8c8.tar.bz2 | |
[SPARC64]: Fix ptrace/strace
Don't clobber register %l0 while checking TI_SYS_NOERROR value in
syscall return path. This bug was introduced by:
db7d9a4eb700be766cc9f29241483dbb1e748832
Problem narrowed down by Luis F. Ortiz and Richard Mortimer.
I tried using %l2 as suggested by Luis and that works for me.
Looking at the code I wonder if it makes sense to simplify the code
a little bit. The following works for me but I'm not sure how to
exercise the "NOERROR" codepath.
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | arch/sparc64/kernel/entry.S | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S index 11a848402fb1..710002991888 100644 --- a/arch/sparc64/kernel/entry.S +++ b/arch/sparc64/kernel/entry.S @@ -1657,13 +1657,10 @@ ret_sys_call: /* Check if force_successful_syscall_return() * was invoked. */ - ldub [%curptr + TI_SYS_NOERROR], %l0 - brz,pt %l0, 1f - nop - ba,pt %xcc, 80f + ldub [%curptr + TI_SYS_NOERROR], %l2 + brnz,a,pn %l2, 80f stb %g0, [%curptr + TI_SYS_NOERROR] -1: cmp %o0, -ERESTART_RESTARTBLOCK bgeu,pn %xcc, 1f andcc %l0, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %l6 |