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m68k: add TIF_NOTIFY_RESUME and handle it.

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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>
This commit is contained in:
Al Viro
2012-04-24 01:46:23 -04:00
parent 899dfaa7e7
commit a54f1655be
6 changed files with 21 additions and 7 deletions
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6
arch/m68k/kernel/entry_mm.S
View File

@@ -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

15
arch/m68k/kernel/signal.c
View File

@@ -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();
}
}