sparc: share process creation helpers between sparc and sparc64

As promised in the previous patch, this moves the process creation
helpers into a common process.c file that is shared between sparc and
sparc64. It allows us to get rid of quite a bit custom assembler and the
to remove the separe 32bit specific sparc_do_fork() call.

One thing to note, is that when clone() was called with a separate stack
for the child the assembler would align it. But copy_thread() has always
been doing that too so that line wasn't needed and can thus simply be
removed.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Guo Ren <guoren@kernel.org>
Cc: linux-csky@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Link: https://lore.kernel.org/r/20200512171527.570109-3-christian.brauner@ubuntu.com

1 files changed, 0 insertions, 94 deletions

diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index 8c400fca4e9f..278bf287c4be 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -572,100 +572,6 @@ barf:
 	force_sig(SIGSEGV);
 }
 
-asmlinkage long sparc_fork(struct pt_regs *regs)
-{
-	unsigned long orig_i1 = regs->u_regs[UREG_I1];
-	long ret;
-	struct kernel_clone_args args = {
-		.exit_signal	= SIGCHLD,
-		/* Reuse the parent's stack for the child. */
-		.stack		= regs->u_regs[UREG_FP],
-	};
-
-	ret = _do_fork(&args);
-
-	/* If we get an error and potentially restart the system
-	 * call, we're screwed because copy_thread_tls() 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;
-}
-
-asmlinkage long sparc_vfork(struct pt_regs *regs)
-{
-	unsigned long orig_i1 = regs->u_regs[UREG_I1];
-	long ret;
-
-	struct kernel_clone_args args = {
-		.flags		= CLONE_VFORK | CLONE_VM,
-		.exit_signal	= SIGCHLD,
-		/* Reuse the parent's stack for the child. */
-		.stack		= regs->u_regs[UREG_FP],
-	};
-
-	ret = _do_fork(&args);
-
-	/* If we get an error and potentially restart the system
-	 * call, we're screwed because copy_thread_tls() 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;
-}
-
-asmlinkage long sparc_clone(struct pt_regs *regs)
-{
-	unsigned long orig_i1 = regs->u_regs[UREG_I1];
-	unsigned int flags = lower_32_bits(regs->u_regs[UREG_I0]);
-	long ret;
-
-	struct kernel_clone_args args = {
-		.flags		= (flags & ~CSIGNAL),
-		.exit_signal	= (flags & CSIGNAL),
-		.tls		= regs->u_regs[UREG_I3],
-	};
-
-#ifdef CONFIG_COMPAT
-	if (test_thread_flag(TIF_32BIT)) {
-		args.pidfd	= compat_ptr(regs->u_regs[UREG_I2]);
-		args.child_tid	= compat_ptr(regs->u_regs[UREG_I4]);
-		args.parent_tid	= compat_ptr(regs->u_regs[UREG_I2]);
-	} else
-#endif
-	{
-		args.pidfd	= (int __user *)regs->u_regs[UREG_I2];
-		args.child_tid	= (int __user *)regs->u_regs[UREG_I4];
-		args.parent_tid	= (int __user *)regs->u_regs[UREG_I2];
-	}
-
-	/* Did userspace setup a separate stack for the child or are we
-	 * copying the parent's?
-	 */
-	if (regs->u_regs[UREG_I1])
-		args.stack = regs->u_regs[UREG_I1];
-	else
-		args.stack = regs->u_regs[UREG_FP];
-
-	ret = _do_fork(&args);
-
-	/* If we get an error and potentially restart the system
-	 * call, we're screwed because copy_thread_tls() 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
  * under SunOS are nothing short of bletcherous:
  * Parent -->  %o0 == childs  pid, %o1 == 0