1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Implementation of various system calls for Linux/PowerPC 4 * 5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 6 * 7 * Derived from "arch/i386/kernel/sys_i386.c" 8 * Adapted from the i386 version by Gary Thomas 9 * Modified by Cort Dougan (cort@cs.nmt.edu) 10 * and Paul Mackerras (paulus@cs.anu.edu.au). 11 * 12 * This file contains various random system calls that 13 * have a non-standard calling sequence on the Linux/PPC 14 * platform. 15 */ 16 17 #include <linux/errno.h> 18 #include <linux/sched.h> 19 #include <linux/syscalls.h> 20 #include <linux/mm.h> 21 #include <linux/fs.h> 22 #include <linux/smp.h> 23 #include <linux/sem.h> 24 #include <linux/msg.h> 25 #include <linux/shm.h> 26 #include <linux/stat.h> 27 #include <linux/mman.h> 28 #include <linux/sys.h> 29 #include <linux/ipc.h> 30 #include <linux/utsname.h> 31 #include <linux/file.h> 32 #include <linux/personality.h> 33 34 #include <linux/uaccess.h> 35 #include <asm/syscalls.h> 36 #include <asm/time.h> 37 #include <asm/unistd.h> 38 39 static long do_mmap2(unsigned long addr, size_t len, 40 unsigned long prot, unsigned long flags, 41 unsigned long fd, unsigned long off, int shift) 42 { 43 if (!arch_validate_prot(prot, addr)) 44 return -EINVAL; 45 46 if (!IS_ALIGNED(off, 1 << shift)) 47 return -EINVAL; 48 49 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> shift); 50 } 51 52 SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len, 53 unsigned long, prot, unsigned long, flags, 54 unsigned long, fd, unsigned long, pgoff) 55 { 56 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 57 } 58 59 #ifdef CONFIG_COMPAT 60 COMPAT_SYSCALL_DEFINE6(mmap2, 61 unsigned long, addr, size_t, len, 62 unsigned long, prot, unsigned long, flags, 63 unsigned long, fd, unsigned long, off_4k) 64 { 65 return do_mmap2(addr, len, prot, flags, fd, off_4k, PAGE_SHIFT-12); 66 } 67 #endif 68 69 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len, 70 unsigned long, prot, unsigned long, flags, 71 unsigned long, fd, off_t, offset) 72 { 73 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 74 } 75 76 #ifdef CONFIG_PPC64 77 static long do_ppc64_personality(unsigned long personality) 78 { 79 long ret; 80 81 if (personality(current->personality) == PER_LINUX32 82 && personality(personality) == PER_LINUX) 83 personality = (personality & ~PER_MASK) | PER_LINUX32; 84 ret = ksys_personality(personality); 85 if (personality(ret) == PER_LINUX32) 86 ret = (ret & ~PER_MASK) | PER_LINUX; 87 return ret; 88 } 89 long ppc64_personality(unsigned long personality) 90 { 91 return do_ppc64_personality(personality); 92 } 93 #endif 94 95 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 96 u32 len_high, u32 len_low) 97 { 98 return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low), 99 merge_64(len_high, len_low), advice); 100 } 101 102 SYSCALL_DEFINE0(switch_endian) 103 { 104 struct thread_info *ti; 105 106 regs_set_return_msr(current->thread.regs, 107 current->thread.regs->msr ^ MSR_LE); 108 109 /* 110 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to 111 * userspace. That also has the effect of restoring the non-volatile 112 * GPRs, so we saved them on the way in here. 113 */ 114 ti = current_thread_info(); 115 ti->flags |= _TIF_RESTOREALL; 116 117 return 0; 118 } 119