score: add old syscall support

arch/score/include/asm/unistd.h

···
 
 #define __ARCH_HAVE_MMU
 
+#define __ARCH_WANT_SYSCALL_NO_AT
+#define __ARCH_WANT_SYSCALL_NO_FLAGS
+#define __ARCH_WANT_SYSCALL_OFF_T
+#define __ARCH_WANT_SYSCALL_DEPRECATED
+
 #include <asm-generic/unistd.h>
 
 #endif /* _ASM_SCORE_UNISTD_H */

arch/score/kernel/entry.S

···
 	mv	r4, r0
 	la	r8, score_sigaltstack
 	br	r8
+
+#ifdef __ARCH_WANT_SYSCALL_DEPRECATED
+ENTRY(sys_fork)
+	mv	r4, r0
+	la	r8, score_fork
+	br	r8
+
+ENTRY(sys_vfork)
+	mv	r4, r0
+	la	r8, score_vfork
+	br	r8
+#endif /* __ARCH_WANT_SYSCALL_DEPRECATED */
+

arch/score/kernel/sys_score.c

···
 
 #include <linux/file.h>
 #include <linux/fs.h>
+#include <linux/mm.h>
 #include <linux/mman.h>
 #include <linux/module.h>
 #include <linux/unistd.h>
···
 	}
 
 	down_write(&current->mm->mmap_sem);
-	error = do_mmap_pgoff(file, addr, len, prot, flags,
-			pgoff >> (PAGE_SHIFT - 12));
+	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 	up_write(&current->mm->mmap_sem);
 
 	if (file)
 		fput(file);
 
 	return error;
+}
+
+asmlinkage long
+sys_mmap(unsigned long addr, unsigned long len, unsigned long prot,
+	unsigned long flags, unsigned long fd, off_t pgoff)
+{
+	return sys_mmap2(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT);
+}
+
+asmlinkage long
+score_fork(struct pt_regs *regs)
+{
+	return do_fork(SIGCHLD, regs->regs[0], regs, 0, NULL, NULL);
 }
 
 /*
···
 
 	return do_fork(clone_flags, newsp, regs, 0,
 			parent_tidptr, child_tidptr);
+}
+
+asmlinkage long
+score_vfork(struct pt_regs *regs)
+{
+	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
+			regs->regs[0], regs, 0, NULL, NULL);
 }
 
 /*