sh: switch to generic fork/vfork/clone

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/sh/include/asm/syscalls_32.h

@@ -9,16 +9,6 @@
 
 struct pt_regs;
 
-asmlinkage int sys_fork(unsigned long r4, unsigned long r5,
-			unsigned long r6, unsigned long r7,
-			struct pt_regs __regs);
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
-			 unsigned long parent_tidptr,
-			 unsigned long child_tidptr,
-			 struct pt_regs __regs);
-asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
-			 unsigned long r6, unsigned long r7,
-			 struct pt_regs __regs);
 asmlinkage int sys_sigsuspend(old_sigset_t mask);
 asmlinkage int sys_sigaction(int sig, const struct old_sigaction __user *act,
 			     struct old_sigaction __user *oact);

arch/sh/include/asm/syscalls_64.h

@@ -9,19 +9,6 @@
 
 struct pt_regs;
 
-asmlinkage int sys_fork(unsigned long r2, unsigned long r3,
-			unsigned long r4, unsigned long r5,
-			unsigned long r6, unsigned long r7,
-			struct pt_regs *pregs);
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
-			 unsigned long r4, unsigned long r5,
-			 unsigned long r6, unsigned long r7,
-			 struct pt_regs *pregs);
-asmlinkage int sys_vfork(unsigned long r2, unsigned long r3,
-			 unsigned long r4, unsigned long r5,
-			 unsigned long r6, unsigned long r7,
-			 struct pt_regs *pregs);
-
 /* Misc syscall related bits */
 asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs);
 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);

arch/sh/include/asm/unistd.h

@@ -29,6 +29,9 @@
 # define __ARCH_WANT_SYS_SIGPROCMASK
 # define __ARCH_WANT_SYS_RT_SIGACTION
 # define __ARCH_WANT_SYS_EXECVE
+# define __ARCH_WANT_SYS_FORK
+# define __ARCH_WANT_SYS_VFORK
+# define __ARCH_WANT_SYS_CLONE
 
 /*
  * "Conditional" syscalls

arch/sh/kernel/process_32.c

@@ -129,7 +129,7 @@ asmlinkage void ret_from_kernel_thread(void);
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
 		unsigned long arg,
-		struct task_struct *p, struct pt_regs *regs)
+		struct task_struct *p, struct pt_regs *unused)
 {
 	struct thread_info *ti = task_thread_info(p);
 	struct pt_regs *childregs;
@@ -164,9 +164,10 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 		p->fpu_counter = 0;
 		return 0;
 	}
-	*childregs = *regs;
+	*childregs = *current_pt_regs();
 
-	childregs->regs[15] = usp;
+	if (usp)
+		childregs->regs[15] = usp;
 	ti->addr_limit = USER_DS;
 
 	if (clone_flags & CLONE_SETTLS)
@@ -217,51 +218,6 @@ __switch_to(struct task_struct *prev, struct task_struct *next)
 	return prev;
 }
 
-asmlinkage int sys_fork(unsigned long r4, unsigned long r5,
-			unsigned long r6, unsigned long r7,
-			struct pt_regs __regs)
-{
-#ifdef CONFIG_MMU
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL);
-#else
-	/* fork almost works, enough to trick you into looking elsewhere :-( */
-	return -EINVAL;
-#endif
-}
-
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
-			 unsigned long parent_tidptr,
-			 unsigned long child_tidptr,
-			 struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	if (!newsp)
-		newsp = regs->regs[15];
-	return do_fork(clone_flags, newsp, regs, 0,
-			(int __user *)parent_tidptr,
-			(int __user *)child_tidptr);
-}
-
-/*
- * This is trivial, and on the face of it looks like it
- * could equally well be done in user mode.
- *
- * Not so, for quite unobvious reasons - register pressure.
- * In user mode vfork() cannot have a stack frame, and if
- * done by calling the "clone()" system call directly, you
- * do not have enough call-clobbered registers to hold all
- * the information you need.
- */
-asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
-			 unsigned long r6, unsigned long r7,
-			 struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs,
-		       0, NULL, NULL);
-}
-
 unsigned long get_wchan(struct task_struct *p)
 {
 	unsigned long pc;

arch/sh/kernel/process_64.c

@@ -383,7 +383,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 		save_fpu(current);
 		disable_fpu();
 		last_task_used_math = NULL;
-		regs->sr |= SR_FD;
+		current_pt_regs()->sr |= SR_FD;
 	}
 #endif
 	/* Copy from sh version */
@@ -399,15 +399,16 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 		p->thread.pc = (unsigned long) ret_from_kernel_thread;
 		return 0;
 	}
-	*childregs = *regs;
+	*childregs = *current_pt_regs();
 
 	/*
 	 * Sign extend the edited stack.
 	 * Note that thread.pc and thread.pc will stay
 	 * 32-bit wide and context switch must take care
 	 * of NEFF sign extension.
 	 */
-	childregs->regs[15] = neff_sign_extend(usp);
+	if (usp)
+		childregs->regs[15] = neff_sign_extend(usp);
 	p->thread.uregs = childregs;
 
 	childregs->regs[9] = 0; /* Set return value for child */
@@ -418,42 +419,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 	return 0;
 }
 
-asmlinkage int sys_fork(unsigned long r2, unsigned long r3,
-			unsigned long r4, unsigned long r5,
-			unsigned long r6, unsigned long r7,
-			struct pt_regs *pregs)
-{
-	return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
-}
-
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
-			 unsigned long r4, unsigned long r5,
-			 unsigned long r6, unsigned long r7,
-			 struct pt_regs *pregs)
-{
-	if (!newsp)
-		newsp = pregs->regs[15];
-	return do_fork(clone_flags, newsp, pregs, 0, 0, 0);
-}
-
-/*
- * This is trivial, and on the face of it looks like it
- * could equally well be done in user mode.
- *
- * Not so, for quite unobvious reasons - register pressure.
- * In user mode vfork() cannot have a stack frame, and if
- * done by calling the "clone()" system call directly, you
- * do not have enough call-clobbered registers to hold all
- * the information you need.
- */
-asmlinkage int sys_vfork(unsigned long r2, unsigned long r3,
-			 unsigned long r4, unsigned long r5,
-			 unsigned long r6, unsigned long r7,
-			 struct pt_regs *pregs)
-{
-	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
-}
-
 #ifdef CONFIG_FRAME_POINTER
 static int in_sh64_switch_to(unsigned long pc)
 {