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parisc: decide whether to go to slow path (tracesys) based on thread flags

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-05-20 11:59:03 -04:00
parent e3b880c6ee
commit 64482bd8ef
2 changed files with 6 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
arch/parisc/include/asm/thread_info.h
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@ -74,6 +74,8 @@ struct thread_info {
#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
_TIF_NEED_RESCHED)
#define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
_TIF_BLOCKSTEP)
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)

7
arch/parisc/kernel/syscall.S
View file

@ -180,9 +180,10 @@ linux_gateway_entry:
/* Are we being ptraced? */
mfctl %cr30, %r1
LDREG TI_TASK(%r1),%r1
ldw TASK_PTRACE(%r1), %r1
bb,<,n %r1,31,.Ltracesys
LDREG TI_FLAGS(%r1),%r1
ldi _TIF_SYSCALL_TRACE_MASK, %r19
and,COND(=) %r1, %r19, %r0
b,n .Ltracesys
/* Note! We cannot use the syscall table that is mapped
nearby since the gateway page is mapped execute-only. */