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[SPARC64]: Fix ptrace/strace

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Don't clobber register %l0 while checking TI_SYS_NOERROR value in
syscall return path.  This bug was introduced by:

db7d9a4eb7

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>
This commit is contained in:
Richard Mortimer 2006-01-09 14:35:50 -08:00 committed by David S. Miller
parent 90bf811664
commit 695ca07bf1
1 changed files with 2 additions and 5 deletions
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7
arch/sparc64/kernel/entry.S
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@ -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