[S390] fix system call parameter functions.

syscall_get_nr() currently returns a valid result only if the call
chain of the traced process includes do_syscall_trace_enter(). But
collect_syscall() can be called for any sleeping task, the result of
syscall_get_nr() in general is completely bogus.

To make syscall_get_nr() work for any sleeping task the traps field
in pt_regs is replace with svcnr - the system call number the process
is executing. If svcnr == 0 the process is not on a system call path.

The syscall_get_arguments and syscall_set_arguments use regs->gprs[2]
for the first system call parameter. This is incorrect since gprs[2]
may have been overwritten with the system call number if the call
chain includes do_syscall_trace_enter. Use regs->orig_gprs2 instead.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
index 4f7fc3059a8e..8e6812a22670 100644
--- a/arch/s390/kernel/signal.c
+++ b/arch/s390/kernel/signal.c
@@ -160,7 +160,7 @@ static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
         current->thread.fp_regs.fpc &= FPC_VALID_MASK;
 
         restore_fp_regs(&current->thread.fp_regs);
-        regs->trap = -1;        /* disable syscall checks */
+        regs->svcnr = 0;        /* disable syscall checks */
         return 0;
 }
 
@@ -445,7 +445,7 @@ void do_signal(struct pt_regs *regs)
                 oldset = &current->blocked;
 
         /* Are we from a system call? */
-        if (regs->trap == __LC_SVC_OLD_PSW) {
+        if (regs->svcnr) {
                 continue_addr = regs->psw.addr;
                 restart_addr = continue_addr - regs->ilc;
                 retval = regs->gprs[2];
@@ -462,7 +462,7 @@ void do_signal(struct pt_regs *regs)
                 case -ERESTART_RESTARTBLOCK:
                         regs->gprs[2] = -EINTR;
                 }
-                regs->trap = -1;        /* Don't deal with this again. */
+                regs->svcnr = 0;        /* Don't deal with this again. */
         }
 
         /* Get signal to deliver.  When running under ptrace, at this point