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 inline 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 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len, 60 unsigned long, prot, unsigned long, flags, 61 unsigned long, fd, off_t, offset) 62 { 63 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 64 } 65 66 #ifdef CONFIG_PPC32 67 /* 68 * Due to some executables calling the wrong select we sometimes 69 * get wrong args. This determines how the args are being passed 70 * (a single ptr to them all args passed) then calls 71 * sys_select() with the appropriate args. -- Cort 72 */ 73 int 74 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct __kernel_old_timeval __user *tvp) 75 { 76 if ((unsigned long)n >= 4096) 77 return sys_old_select((void __user *)n); 78 79 return sys_select(n, inp, outp, exp, tvp); 80 } 81 #endif 82 83 #ifdef CONFIG_PPC64 84 long ppc64_personality(unsigned long personality) 85 { 86 long ret; 87 88 if (personality(current->personality) == PER_LINUX32 89 && personality(personality) == PER_LINUX) 90 personality = (personality & ~PER_MASK) | PER_LINUX32; 91 ret = sys_personality(personality); 92 if (personality(ret) == PER_LINUX32) 93 ret = (ret & ~PER_MASK) | PER_LINUX; 94 return ret; 95 } 96 #endif 97 98 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 99 u32 len_high, u32 len_low) 100 { 101 return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low), 102 merge_64(len_high, len_low), advice); 103 } 104 105 SYSCALL_DEFINE0(switch_endian) 106 { 107 struct thread_info *ti; 108 109 regs_set_return_msr(current->thread.regs, 110 current->thread.regs->msr ^ MSR_LE); 111 112 /* 113 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to 114 * userspace. That also has the effect of restoring the non-volatile 115 * GPRs, so we saved them on the way in here. 116 */ 117 ti = current_thread_info(); 118 ti->flags |= _TIF_RESTOREALL; 119 120 return 0; 121 } 122