From a54f1655be4cb103a6729adcc9ca914c5fdf1ca0 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 24 Apr 2012 01:46:23 -0400 Subject: [PATCH] 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 --- arch/m68k/include/asm/thread_info.h | 1 + arch/m68k/kernel/entry_mm.S | 6 +++--- arch/m68k/kernel/signal.c | 15 ++++++++++++++- arch/m68k/platform/68328/entry.S | 2 +- arch/m68k/platform/68360/entry.S | 2 +- arch/m68k/platform/coldfire/entry.S | 2 +- 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 e8665e6f9464..126131f94a2c 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 675a854966a6..f29e73ca9dbb 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 d8f6960e8fd9..d9f3d1900eed 100644 --- a/arch/m68k/kernel/signal.c +++ b/arch/m68k/kernel/signal.c @@ -43,6 +43,7 @@ #include #include #include +#include #include #include @@ -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, ¤t->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 5c39b80ed7de..7f91c2fde509 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 aa47d1d49929..904fd9a4af4e 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 281e38c2b6c7..881ab8e379d4 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 -- 2.39.5