sparc64: tracehook: TIF_NOTIFY_RESUME
This adds TIF_NOTIFY_RESUME support for sparc64.
When set, we call tracehook_notify_resume() on the way to user mode.
Signed-off-by: Roland McGrath <roland@redhat.com>
diff --git a/arch/sparc/include/asm/thread_info_64.h b/arch/sparc/include/asm/thread_info_64.h
index 960969d..c0a737d 100644
--- a/arch/sparc/include/asm/thread_info_64.h
+++ b/arch/sparc/include/asm/thread_info_64.h
@@ -219,7 +219,7 @@
* nop
*/
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
-/* flags bit 1 is available */
+#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_PERFCTR 4 /* performance counters active */
@@ -239,6 +239,7 @@
#define TIF_POLLING_NRFLAG 14
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
+#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_PERFCTR (1<<TIF_PERFCTR)
@@ -250,8 +251,9 @@
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
- (_TIF_SIGPENDING | \
- _TIF_NEED_RESCHED | _TIF_PERFCTR))
+ _TIF_DO_NOTIFY_RESUME_MASK | \
+ _TIF_NEED_RESCHED | _TIF_PERFCTR)
+#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
/*
* Thread-synchronous status.
diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S
index c6fc695..97a993c 100644
--- a/arch/sparc64/kernel/rtrap.S
+++ b/arch/sparc64/kernel/rtrap.S
@@ -46,7 +46,7 @@
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
ldx [%g6 + TI_FLAGS], %l0
-1: andcc %l0, _TIF_SIGPENDING, %g0
+1: andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
be,pt %xcc, __handle_user_windows_continue
nop
mov %l5, %o1
@@ -86,7 +86,7 @@
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
ldx [%g6 + TI_FLAGS], %l0
-1: andcc %l0, _TIF_SIGPENDING, %g0
+1: andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
be,pt %xcc, __handle_perfctrs_continue
sethi %hi(TSTATE_PEF), %o0
@@ -195,7 +195,7 @@
andcc %l1, %o0, %g0
andcc %l0, _TIF_NEED_RESCHED, %g0
bne,pn %xcc, __handle_preemption
- andcc %l0, _TIF_SIGPENDING, %g0
+ andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
bne,pn %xcc, __handle_signal
__handle_signal_continue:
ldub [%g6 + TI_WSAVED], %o2
diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c
index 9667e96..9424fda 100644
--- a/arch/sparc64/kernel/signal.c
+++ b/arch/sparc64/kernel/signal.c
@@ -17,6 +17,7 @@
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
+#include <linux/tracehook.h>
#include <linux/unistd.h>
#include <linux/mm.h>
#include <linux/tty.h>
@@ -605,4 +606,8 @@
{
if (thread_info_flags & _TIF_SIGPENDING)
do_signal(regs, orig_i0);
+ if (thread_info_flags & _TIF_NOTIFY_RESUME) {
+ clear_thread_flag(TIF_NOTIFY_RESUME);
+ tracehook_notify_resume(regs);
+ }
}