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 long ret = -EINVAL; 45 46 if (!arch_validate_prot(prot, addr)) 47 goto out; 48 49 if (shift) { 50 if (off & ((1 << shift) - 1)) 51 goto out; 52 off >>= shift; 53 } 54 55 ret = ksys_mmap_pgoff(addr, len, prot, flags, fd, off); 56 out: 57 return ret; 58 } 59 60 SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len, 61 unsigned long, prot, unsigned long, flags, 62 unsigned long, fd, unsigned long, pgoff) 63 { 64 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 65 } 66 67 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len, 68 unsigned long, prot, unsigned long, flags, 69 unsigned long, fd, off_t, offset) 70 { 71 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 72 } 73 74 #ifdef CONFIG_PPC32 75 /* 76 * Due to some executables calling the wrong select we sometimes 77 * get wrong args. This determines how the args are being passed 78 * (a single ptr to them all args passed) then calls 79 * sys_select() with the appropriate args. -- Cort 80 */ 81 int 82 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct __kernel_old_timeval __user *tvp) 83 { 84 if ( (unsigned long)n >= 4096 ) 85 { 86 unsigned long __user *buffer = (unsigned long __user *)n; 87 if (!access_ok(buffer, 5*sizeof(unsigned long)) 88 || __get_user(n, buffer) 89 || __get_user(inp, ((fd_set __user * __user *)(buffer+1))) 90 || __get_user(outp, ((fd_set __user * __user *)(buffer+2))) 91 || __get_user(exp, ((fd_set __user * __user *)(buffer+3))) 92 || __get_user(tvp, ((struct __kernel_old_timeval __user * __user *)(buffer+4)))) 93 return -EFAULT; 94 } 95 return sys_select(n, inp, outp, exp, tvp); 96 } 97 #endif 98 99 #ifdef CONFIG_PPC64 100 long ppc64_personality(unsigned long personality) 101 { 102 long ret; 103 104 if (personality(current->personality) == PER_LINUX32 105 && personality(personality) == PER_LINUX) 106 personality = (personality & ~PER_MASK) | PER_LINUX32; 107 ret = sys_personality(personality); 108 if (personality(ret) == PER_LINUX32) 109 ret = (ret & ~PER_MASK) | PER_LINUX; 110 return ret; 111 } 112 #endif 113 114 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 115 u32 len_high, u32 len_low) 116 { 117 return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low, 118 (u64)len_high << 32 | len_low, advice); 119 } 120 121 SYSCALL_DEFINE0(switch_endian) 122 { 123 struct thread_info *ti; 124 125 current->thread.regs->msr ^= MSR_LE; 126 127 /* 128 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to 129 * userspace. That also has the effect of restoring the non-volatile 130 * GPRs, so we saved them on the way in here. 131 */ 132 ti = current_thread_info(); 133 ti->flags |= _TIF_RESTOREALL; 134 135 return 0; 136 } 137