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authorAl Viro <viro@zeniv.linux.org.uk>2012-04-24 01:46:23 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-05-21 23:59:47 -0400
commita54f1655be4cb103a6729adcc9ca914c5fdf1ca0 (patch)
treea54cfff27d2fb3b9d04daa3490a7e601df586c18
parent899dfaa7e7dd825f8366c2a6b38067db43644dc6 (diff)
downloadop-kernel-dev-a54f1655be4cb103a6729adcc9ca914c5fdf1ca0.zip
op-kernel-dev-a54f1655be4cb103a6729adcc9ca914c5fdf1ca0.tar.gz
m68k: add TIF_NOTIFY_RESUME and handle it.
TIF_NOTIFY_RESUME added (as bit 5). That way nommu glue needs no changes at all; mmu one needs just to replace jmi do_signal_return to jne do_signal_return There we have flags shifted up, until bit 6 (SIGPENDING) is in MSBit; instead of checking that MSBit is set (jmi) we check that MSBit or something below it is set (jne); bits 0..4 are never set, so that's precisely "bit 6 or bit 5 is set". Usual handling of NOTIFY_RESUME/SIGPENDING is done in do_notify_resume(); glue calls it instead of do_signal(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--arch/m68k/include/asm/thread_info.h1
-rw-r--r--arch/m68k/kernel/entry_mm.S6
-rw-r--r--arch/m68k/kernel/signal.c15
-rw-r--r--arch/m68k/platform/68328/entry.S2
-rw-r--r--arch/m68k/platform/68360/entry.S2
-rw-r--r--arch/m68k/platform/coldfire/entry.S2
6 files changed, 21 insertions, 7 deletions
diff --git a/arch/m68k/include/asm/thread_info.h b/arch/m68k/include/asm/thread_info.h
index e8665e6..126131f 100644
--- a/arch/m68k/include/asm/thread_info.h
+++ b/arch/m68k/include/asm/thread_info.h
@@ -71,6 +71,7 @@ static inline struct thread_info *current_thread_info(void)
* bits 0-7 are tested at every exception exit
* bits 8-15 are also tested at syscall exit
*/
+#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
#define TIF_SIGPENDING 6 /* signal pending */
#define TIF_NEED_RESCHED 7 /* rescheduling necessary */
#define TIF_DELAYED_TRACE 14 /* single step a syscall */
diff --git a/arch/m68k/kernel/entry_mm.S b/arch/m68k/kernel/entry_mm.S
index 675a854..f29e73c 100644
--- a/arch/m68k/kernel/entry_mm.S
+++ b/arch/m68k/kernel/entry_mm.S
@@ -148,7 +148,7 @@ syscall_exit_work:
jcs do_trace_exit
jmi do_delayed_trace
lslw #8,%d0
- jmi do_signal_return
+ jne do_signal_return
pea resume_userspace
jra schedule
@@ -172,7 +172,7 @@ exit_work:
| save top of frame
movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
lslb #1,%d0
- jmi do_signal_return
+ jne do_signal_return
pea resume_userspace
jra schedule
@@ -182,7 +182,7 @@ do_signal_return:
subql #4,%sp | dummy return address
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
- bsrl do_signal
+ bsrl do_notify_resume
addql #4,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index d8f6960..d9f3d19 100644
--- a/arch/m68k/kernel/signal.c
+++ b/arch/m68k/kernel/signal.c
@@ -43,6 +43,7 @@
#include <linux/tty.h>
#include <linux/binfmts.h>
#include <linux/module.h>
+#include <linux/tracehook.h>
#include <asm/setup.h>
#include <asm/uaccess.h>
@@ -1154,7 +1155,7 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
-asmlinkage void do_signal(struct pt_regs *regs)
+static void do_signal(struct pt_regs *regs)
{
siginfo_t info;
struct k_sigaction ka;
@@ -1186,3 +1187,15 @@ asmlinkage void do_signal(struct pt_regs *regs)
sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
}
}
+
+void do_notify_resume(struct pt_regs *regs)
+{
+ if (test_thread_flag(TIF_SIGPENDING))
+ do_signal(regs);
+
+ if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) {
+ tracehook_notify_resume(regs);
+ if (current->replacement_session_keyring)
+ key_replace_session_keyring();
+ }
+}
diff --git a/arch/m68k/platform/68328/entry.S b/arch/m68k/platform/68328/entry.S
index 5c39b80..7f91c2f 100644
--- a/arch/m68k/platform/68328/entry.S
+++ b/arch/m68k/platform/68328/entry.S
@@ -119,7 +119,7 @@ Lsignal_return:
subql #4,%sp /* dummy return address*/
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
- bsrw do_signal
+ bsrw do_notify_resume
addql #4,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
diff --git a/arch/m68k/platform/68360/entry.S b/arch/m68k/platform/68360/entry.S
index aa47d1d..904fd9a 100644
--- a/arch/m68k/platform/68360/entry.S
+++ b/arch/m68k/platform/68360/entry.S
@@ -115,7 +115,7 @@ Lsignal_return:
subql #4,%sp /* dummy return address*/
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
- bsrw do_signal
+ bsrw do_notify_resume
addql #4,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
diff --git a/arch/m68k/platform/coldfire/entry.S b/arch/m68k/platform/coldfire/entry.S
index 281e38c..881ab8e 100644
--- a/arch/m68k/platform/coldfire/entry.S
+++ b/arch/m68k/platform/coldfire/entry.S
@@ -152,7 +152,7 @@ Lsignal_return:
subql #4,%sp /* dummy return address */
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
- jsr do_signal
+ jsr do_notify_resume
addql #4,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
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