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 <asm/uaccess.h> 40 #include <asm/syscalls.h> 41 #include <asm/time.h> 42 #include <asm/unistd.h> 43 44 static inline unsigned long do_mmap2(unsigned long addr, size_t len, 45 unsigned long prot, unsigned long flags, 46 unsigned long fd, unsigned long off, int shift) 47 { 48 unsigned long ret = -EINVAL; 49 50 if (!arch_validate_prot(prot)) 51 goto out; 52 53 if (shift) { 54 if (off & ((1 << shift) - 1)) 55 goto out; 56 off >>= shift; 57 } 58 59 ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off); 60 out: 61 return ret; 62 } 63 64 unsigned long sys_mmap2(unsigned long addr, size_t len, 65 unsigned long prot, unsigned long flags, 66 unsigned long fd, unsigned long pgoff) 67 { 68 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 69 } 70 71 unsigned long sys_mmap(unsigned long addr, size_t len, 72 unsigned long prot, unsigned long flags, 73 unsigned long fd, off_t offset) 74 { 75 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 76 } 77 78 #ifdef CONFIG_PPC32 79 /* 80 * Due to some executables calling the wrong select we sometimes 81 * get wrong args. This determines how the args are being passed 82 * (a single ptr to them all args passed) then calls 83 * sys_select() with the appropriate args. -- Cort 84 */ 85 int 86 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp) 87 { 88 if ( (unsigned long)n >= 4096 ) 89 { 90 unsigned long __user *buffer = (unsigned long __user *)n; 91 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long)) 92 || __get_user(n, buffer) 93 || __get_user(inp, ((fd_set __user * __user *)(buffer+1))) 94 || __get_user(outp, ((fd_set __user * __user *)(buffer+2))) 95 || __get_user(exp, ((fd_set __user * __user *)(buffer+3))) 96 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4)))) 97 return -EFAULT; 98 } 99 return sys_select(n, inp, outp, exp, tvp); 100 } 101 #endif 102 103 #ifdef CONFIG_PPC64 104 long ppc64_personality(unsigned long personality) 105 { 106 long ret; 107 108 if (personality(current->personality) == PER_LINUX32 109 && personality(personality) == PER_LINUX) 110 personality = (personality & ~PER_MASK) | PER_LINUX32; 111 ret = sys_personality(personality); 112 if (personality(ret) == PER_LINUX32) 113 ret = (ret & ~PER_MASK) | PER_LINUX; 114 return ret; 115 } 116 #endif 117 118 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 119 u32 len_high, u32 len_low) 120 { 121 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low, 122 (u64)len_high << 32 | len_low, advice); 123 } 124