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 #include <asm/asm-prototypes.h> 39 40 static inline long do_mmap2(unsigned long addr, size_t len, 41 unsigned long prot, unsigned long flags, 42 unsigned long fd, unsigned long off, int shift) 43 { 44 if (!arch_validate_prot(prot, addr)) 45 return -EINVAL; 46 47 if (!IS_ALIGNED(off, 1 << shift)) 48 return -EINVAL; 49 50 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> shift); 51 } 52 53 SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len, 54 unsigned long, prot, unsigned long, flags, 55 unsigned long, fd, unsigned long, pgoff) 56 { 57 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 58 } 59 60 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len, 61 unsigned long, prot, unsigned long, flags, 62 unsigned long, fd, off_t, offset) 63 { 64 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 65 } 66 67 #ifdef CONFIG_PPC32 68 /* 69 * Due to some executables calling the wrong select we sometimes 70 * get wrong args. This determines how the args are being passed 71 * (a single ptr to them all args passed) then calls 72 * sys_select() with the appropriate args. -- Cort 73 */ 74 int 75 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct __kernel_old_timeval __user *tvp) 76 { 77 if ( (unsigned long)n >= 4096 ) 78 return sys_old_select((void __user *)n); 79 80 return sys_select(n, inp, outp, exp, tvp); 81 } 82 #endif 83 84 #ifdef CONFIG_PPC64 85 long ppc64_personality(unsigned long personality) 86 { 87 long ret; 88 89 if (personality(current->personality) == PER_LINUX32 90 && personality(personality) == PER_LINUX) 91 personality = (personality & ~PER_MASK) | PER_LINUX32; 92 ret = sys_personality(personality); 93 if (personality(ret) == PER_LINUX32) 94 ret = (ret & ~PER_MASK) | PER_LINUX; 95 return ret; 96 } 97 #endif 98 99 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 100 u32 len_high, u32 len_low) 101 { 102 return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low, 103 (u64)len_high << 32 | len_low, advice); 104 } 105 106 SYSCALL_DEFINE0(switch_endian) 107 { 108 struct thread_info *ti; 109 110 regs_set_return_msr(current->thread.regs, 111 current->thread.regs->msr ^ MSR_LE); 112 113 /* 114 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to 115 * userspace. That also has the effect of restoring the non-volatile 116 * GPRs, so we saved them on the way in here. 117 */ 118 ti = current_thread_info(); 119 ti->flags |= _TIF_RESTOREALL; 120 121 return 0; 122 } 123