// 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>#include <asm/asm-prototypes.h> static inline long do_mmap2(unsigned long addr, size_t len,			unsigned long prot, unsigned long flags,			unsigned long fd, unsigned long off, int shift){	long ret = -EINVAL; 	if (!arch_validate_prot(prot, addr))		goto out; 	if (shift) {		if (off & ((1 << shift) - 1))			goto out;		off >>= shift;	} 	ret = ksys_mmap_pgoff(addr, len, prot, flags, fd, off);out:	return ret;} 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);} 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_PPC32/* * Due to some executables calling the wrong select we sometimes * get wrong args.  This determines how the args are being passed * (a single ptr to them all args passed) then calls * sys_select() with the appropriate args. -- Cort */intppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp){	if ( (unsigned long)n >= 4096 )	{		unsigned long __user *buffer = (unsigned long __user *)n;		if (!access_ok(buffer, 5*sizeof(unsigned long))		    || __get_user(n, buffer)		    || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))		    || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))		    || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))		    || __get_user(tvp, ((struct timeval  __user * __user *)(buffer+4))))			return -EFAULT;	}	return sys_select(n, inp, outp, exp, tvp);}#endif #ifdef CONFIG_PPC64long ppc64_personality(unsigned long personality){	long ret; 	if (personality(current->personality) == PER_LINUX32	    && personality(personality) == PER_LINUX)		personality = (personality & ~PER_MASK) | PER_LINUX32;	ret = sys_personality(personality);	if (personality(ret) == PER_LINUX32)		ret = (ret & ~PER_MASK) | PER_LINUX;	return ret;}#endif long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,		      u32 len_high, u32 len_low){	return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low,				 (u64)len_high << 32 | len_low, advice);} SYSCALL_DEFINE0(switch_endian){	struct thread_info *ti; 	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;}