sparc: Fix fork/clone/vfork system call restart.

We clobber %i1 as well as %i0 for these system calls,
because they give two return values.

Therefore, on error, we have to restore %i1 properly
or else the restart explodes since it uses the wrong
arguments.

This fixes glibc's nptl/tst-eintr1.c testcase.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 3 deletions

diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
index 500ac6d483a0..4129c0449856 100644
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -503,6 +503,8 @@ asmlinkage long sparc_do_fork(unsigned long clone_flags,
                               unsigned long stack_size)
 {
         int __user *parent_tid_ptr, *child_tid_ptr;
+        unsigned long orig_i1 = regs->u_regs[UREG_I1];
+        long ret;
 
 #ifdef CONFIG_COMPAT
         if (test_thread_flag(TIF_32BIT)) {
@@ -515,9 +517,19 @@ asmlinkage long sparc_do_fork(unsigned long clone_flags,
                 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
         }
 
-        return do_fork(clone_flags, stack_start,
-                       regs, stack_size,
-                       parent_tid_ptr, child_tid_ptr);
+        ret = do_fork(clone_flags, stack_start,
+                      regs, stack_size,
+                      parent_tid_ptr, child_tid_ptr);
+
+        /* If we get an error and potentially restart the system
+         * call, we're screwed because copy_thread() clobbered
+         * the parent's %o1.  So detect that case and restore it
+         * here.
+         */
+        if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
+                regs->u_regs[UREG_I1] = orig_i1;
+
+        return ret;
 }
 
 /* Copy a Sparc thread.  The fork() return value conventions