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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | // 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_COMPAT COMPAT_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_PPC64 static 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_COMPAT COMPAT_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; } |