1 /* 2 * Implementation of various system calls for Linux/PowerPC 3 * 4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 5 * 6 * Derived from "arch/i386/kernel/sys_i386.c" 7 * Adapted from the i386 version by Gary Thomas 8 * Modified by Cort Dougan (cort@cs.nmt.edu) 9 * and Paul Mackerras (paulus@cs.anu.edu.au). 10 * 11 * This file contains various random system calls that 12 * have a non-standard calling sequence on the Linux/PPC 13 * platform. 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 * 20 */ 21 22 #include <linux/errno.h> 23 #include <linux/sched.h> 24 #include <linux/syscalls.h> 25 #include <linux/mm.h> 26 #include <linux/fs.h> 27 #include <linux/smp.h> 28 #include <linux/sem.h> 29 #include <linux/msg.h> 30 #include <linux/shm.h> 31 #include <linux/stat.h> 32 #include <linux/mman.h> 33 #include <linux/sys.h> 34 #include <linux/ipc.h> 35 #include <linux/utsname.h> 36 #include <linux/file.h> 37 #include <linux/personality.h> 38 39 #include <linux/uaccess.h> 40 #include <asm/syscalls.h> 41 #include <asm/time.h> 42 #include <asm/unistd.h> 43 #include <asm/asm-prototypes.h> 44 45 static inline long do_mmap2(unsigned long addr, size_t len, 46 unsigned long prot, unsigned long flags, 47 unsigned long fd, unsigned long off, int shift) 48 { 49 long ret = -EINVAL; 50 51 if (!arch_validate_prot(prot, addr)) 52 goto out; 53 54 if (shift) { 55 if (off & ((1 << shift) - 1)) 56 goto out; 57 off >>= shift; 58 } 59 60 ret = ksys_mmap_pgoff(addr, len, prot, flags, fd, off); 61 out: 62 return ret; 63 } 64 65 SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len, 66 unsigned long, prot, unsigned long, flags, 67 unsigned long, fd, unsigned long, pgoff) 68 { 69 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 70 } 71 72 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len, 73 unsigned long, prot, unsigned long, flags, 74 unsigned long, fd, off_t, offset) 75 { 76 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 77 } 78 79 #ifdef CONFIG_PPC32 80 /* 81 * Due to some executables calling the wrong select we sometimes 82 * get wrong args. This determines how the args are being passed 83 * (a single ptr to them all args passed) then calls 84 * sys_select() with the appropriate args. -- Cort 85 */ 86 int 87 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp) 88 { 89 if ( (unsigned long)n >= 4096 ) 90 { 91 unsigned long __user *buffer = (unsigned long __user *)n; 92 if (!access_ok(buffer, 5*sizeof(unsigned long)) 93 || __get_user(n, buffer) 94 || __get_user(inp, ((fd_set __user * __user *)(buffer+1))) 95 || __get_user(outp, ((fd_set __user * __user *)(buffer+2))) 96 || __get_user(exp, ((fd_set __user * __user *)(buffer+3))) 97 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4)))) 98 return -EFAULT; 99 } 100 return sys_select(n, inp, outp, exp, tvp); 101 } 102 #endif 103 104 #ifdef CONFIG_PPC64 105 long ppc64_personality(unsigned long personality) 106 { 107 long ret; 108 109 if (personality(current->personality) == PER_LINUX32 110 && personality(personality) == PER_LINUX) 111 personality = (personality & ~PER_MASK) | PER_LINUX32; 112 ret = sys_personality(personality); 113 if (personality(ret) == PER_LINUX32) 114 ret = (ret & ~PER_MASK) | PER_LINUX; 115 return ret; 116 } 117 #endif 118 119 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 120 u32 len_high, u32 len_low) 121 { 122 return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low, 123 (u64)len_high << 32 | len_low, advice); 124 } 125 126 long sys_switch_endian(void) 127 { 128 struct thread_info *ti; 129 130 current->thread.regs->msr ^= MSR_LE; 131 132 /* 133 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to 134 * userspace. That also has the effect of restoring the non-volatile 135 * GPRs, so we saved them on the way in here. 136 */ 137 ti = current_thread_info(); 138 ti->flags |= _TIF_RESTOREALL; 139 140 return 0; 141 } 142