// SPDX-License-Identifier: GPL-2.0-or-later/* *  Implementation of various system calls for Linux/PowerPC * *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Derived from "arch/i386/kernel/sys_i386.c" * Adapted from the i386 version by Gary Thomas * Modified by Cort Dougan (cort@cs.nmt.edu) * and Paul Mackerras (paulus@cs.anu.edu.au). * * This file contains various random system calls that * have a non-standard calling sequence on the Linux/PPC * platform. */ #include <linux/errno.h>#include <linux/sched.h>#include <linux/syscalls.h>#include <linux/mm.h>#include <linux/fs.h>#include <linux/smp.h>#include <linux/sem.h>#include <linux/msg.h>#include <linux/shm.h>#include <linux/stat.h>#include <linux/mman.h>#include <linux/sys.h>#include <linux/ipc.h>#include <linux/utsname.h>#include <linux/file.h>#include <linux/personality.h> #include <linux/uaccess.h>#include <asm/syscalls.h>#include <asm/time.h>#include <asm/unistd.h> static long do_mmap2(unsigned long addr, size_t len,		     unsigned long prot, unsigned long flags,		     unsigned long fd, unsigned long off, int shift){	if (!arch_validate_prot(prot, addr))		return -EINVAL; 	if (!IS_ALIGNED(off, 1 << shift))		return -EINVAL; 	return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> shift);} SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,		unsigned long, prot, unsigned long, flags,		unsigned long, fd, unsigned long, pgoff){	return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);} #ifdef CONFIG_COMPATCOMPAT_SYSCALL_DEFINE6(mmap2,		       unsigned long, addr, size_t, len,		       unsigned long, prot, unsigned long, flags,		       unsigned long, fd, unsigned long, off_4k){	return do_mmap2(addr, len, prot, flags, fd, off_4k, PAGE_SHIFT-12);}#endif SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,		unsigned long, prot, unsigned long, flags,		unsigned long, fd, off_t, offset){	return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);} #ifdef CONFIG_PPC64static long do_ppc64_personality(unsigned long personality){	long ret; 	if (personality(current->personality) == PER_LINUX32	    && personality(personality) == PER_LINUX)		personality = (personality & ~PER_MASK) | PER_LINUX32;	ret = ksys_personality(personality);	if (personality(ret) == PER_LINUX32)		ret = (ret & ~PER_MASK) | PER_LINUX;	return ret;} SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality){	return do_ppc64_personality(personality);} #ifdef CONFIG_COMPATCOMPAT_SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality){	return do_ppc64_personality(personality);}#endif /* CONFIG_COMPAT */#endif /* CONFIG_PPC64 */ SYSCALL_DEFINE6(ppc_fadvise64_64,		int, fd, int, advice, u32, offset_high, u32, offset_low,		u32, len_high, u32, len_low){	return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low),				 merge_64(len_high, len_low), advice);} SYSCALL_DEFINE0(switch_endian){	struct thread_info *ti; 	regs_set_return_msr(current->thread.regs,				current->thread.regs->msr ^ MSR_LE); 	/*	 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to	 * userspace. That also has the effect of restoring the non-volatile	 * GPRs, so we saved them on the way in here.	 */	ti = current_thread_info();	ti->flags |= _TIF_RESTOREALL; 	return 0;}