microblaze: switch to generic sys_execve()

#define __ARCH_WANT_SYS_SIGPROCMASK

#define __ARCH_WANT_SYS_RT_SIGACTION

#define __ARCH_WANT_SYS_RT_SIGSUSPEND

#define __ARCH_WANT_SYS_EXECVE

/*

 * "Conditional" syscalls

	brid	microblaze_clone

	addk	r7, r1, r0

sys_execve:

	brid	microblaze_execve

	addk	r8, r1, r0

sys_rt_sigreturn_wrapper:

	brid	sys_rt_sigreturn

	addk	r5, r1, r0

	brid	do_fork		/* Do real work (tail-call) */

	add     r8, r0, r0;             /* Arg 3: (unused) */

C_ENTRY(sys_execve):

	brid	microblaze_execve;	/* Do real work (tail-call).*/

	addik	r8, r1, 0;		/* add user context as 4th arg */

C_ENTRY(sys_rt_sigreturn_wrapper):

	brid	sys_rt_sigreturn	/* Do real work */

	addik	r5, r1, 0;		/* add user context as 1st arg */

	return do_fork(flags, stack, regs, 0, NULL, NULL);

}

asmlinkage long microblaze_execve(const char __user *filenamei,

				  const char __user *const __user *argv,

				  const char __user *const __user *envp,

				  struct pt_regs *regs)

{

	int error;

	struct filename *filename;

	filename = getname(filenamei);

	error = PTR_ERR(filename);

	if (IS_ERR(filename))

		goto out;

	error = do_execve(filename->name, argv, envp, regs);

	putname(filename);

out:

	return error;

}

asmlinkage long sys_mmap(unsigned long addr, unsigned long len,

			unsigned long prot, unsigned long flags,

			unsigned long fd, off_t pgoff)