s390: wire up rseq system call

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index baed397..e44bb2b 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -160,6 +160,7 @@ config S390
        select HAVE_OPROFILE
        select HAVE_PERF_EVENTS
        select HAVE_REGS_AND_STACK_ACCESS_API
+       select HAVE_RSEQ
        select HAVE_SYSCALL_TRACEPOINTS
        select HAVE_VIRT_CPU_ACCOUNTING
        select MODULES_USE_ELF_RELA

diff --git a/arch/s390/kernel/compat_wrapper.c b/arch/s390/kernel/compat_wrapper.c
index 607c5e9..2ce28bf 100644 (file)
--- a/arch/s390/kernel/compat_wrapper.c
+++ b/arch/s390/kernel/compat_wrapper.c
@@ -183,3 +183,4 @@ COMPAT_SYSCALL_WRAP2(s390_guarded_storage, int, command, struct gs_cb *, gs_cb);
 COMPAT_SYSCALL_WRAP5(statx, int, dfd, const char __user *, path, unsigned, flags, unsigned, mask, struct statx __user *, buffer);
 COMPAT_SYSCALL_WRAP4(s390_sthyi, unsigned long, code, void __user *, info, u64 __user *, rc, unsigned long, flags);
 COMPAT_SYSCALL_WRAP5(kexec_file_load, int, kernel_fd, int, initrd_fd, unsigned long, cmdline_len, const char __user *, cmdline_ptr, unsigned long, flags)
+COMPAT_SYSCALL_WRAP4(rseq, struct rseq __user *, rseq, u32, rseq_len, int, flags, u32, sig)

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 3891805..150130c 100644 (file)
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -357,6 +357,10 @@ ENTRY(system_call)
        stg     %r2,__PT_R2(%r11)               # store return value
 
 .Lsysc_return:
+#ifdef CONFIG_DEBUG_RSEQ
+       lgr     %r2,%r11
+       brasl   %r14,rseq_syscall
+#endif
        LOCKDEP_SYS_EXIT
 .Lsysc_tif:
        TSTMSK  __PT_FLAGS(%r11),_PIF_WORK

diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
index 2d2960a..22f0824 100644 (file)
--- a/arch/s390/kernel/signal.c
+++ b/arch/s390/kernel/signal.c
@@ -498,7 +498,7 @@ void do_signal(struct pt_regs *regs)
                }
                /* No longer in a system call */
                clear_pt_regs_flag(regs, PIF_SYSCALL);
-
+               rseq_signal_deliver(&ksig, regs);
                if (is_compat_task())
                        handle_signal32(&ksig, oldset, regs);
                else
@@ -537,4 +537,5 @@ void do_notify_resume(struct pt_regs *regs)
 {
        clear_thread_flag(TIF_NOTIFY_RESUME);
        tracehook_notify_resume(regs);
+       rseq_handle_notify_resume(NULL, regs);
 }

diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
index 4baefed..022fc09 100644 (file)
--- a/arch/s390/kernel/syscalls/syscall.tbl
+++ b/arch/s390/kernel/syscalls/syscall.tbl
@@ -390,3 +390,4 @@
 380  common    s390_sthyi              sys_s390_sthyi                  compat_sys_s390_sthyi
 381  common    kexec_file_load         sys_kexec_file_load             compat_sys_kexec_file_load
 382  common    io_pgetevents           sys_io_pgetevents               compat_sys_io_pgetevents
+383  common    rseq                    sys_rseq                        compat_sys_rseq