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 #pragma GCC diagnostic push 66 #pragma GCC diagnostic ignored "-Wpragmas" 67 #pragma GCC diagnostic ignored "-Wattribute-alias" 68 SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len, 69 unsigned long, prot, unsigned long, flags, 70 unsigned long, fd, unsigned long, pgoff) 71 { 72 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 73 } 74 75 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len, 76 unsigned long, prot, unsigned long, flags, 77 unsigned long, fd, off_t, offset) 78 { 79 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 80 } 81 #pragma GCC diagnostic pop 82 83 #ifdef CONFIG_PPC32 84 /* 85 * Due to some executables calling the wrong select we sometimes 86 * get wrong args. This determines how the args are being passed 87 * (a single ptr to them all args passed) then calls 88 * sys_select() with the appropriate args. -- Cort 89 */ 90 int 91 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp) 92 { 93 if ( (unsigned long)n >= 4096 ) 94 { 95 unsigned long __user *buffer = (unsigned long __user *)n; 96 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long)) 97 || __get_user(n, buffer) 98 || __get_user(inp, ((fd_set __user * __user *)(buffer+1))) 99 || __get_user(outp, ((fd_set __user * __user *)(buffer+2))) 100 || __get_user(exp, ((fd_set __user * __user *)(buffer+3))) 101 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4)))) 102 return -EFAULT; 103 } 104 return sys_select(n, inp, outp, exp, tvp); 105 } 106 #endif 107 108 #ifdef CONFIG_PPC64 109 long ppc64_personality(unsigned long personality) 110 { 111 long ret; 112 113 if (personality(current->personality) == PER_LINUX32 114 && personality(personality) == PER_LINUX) 115 personality = (personality & ~PER_MASK) | PER_LINUX32; 116 ret = sys_personality(personality); 117 if (personality(ret) == PER_LINUX32) 118 ret = (ret & ~PER_MASK) | PER_LINUX; 119 return ret; 120 } 121 #endif 122 123 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 124 u32 len_high, u32 len_low) 125 { 126 return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low, 127 (u64)len_high << 32 | len_low, advice); 128 } 129 130 long sys_switch_endian(void) 131 { 132 struct thread_info *ti; 133 134 current->thread.regs->msr ^= MSR_LE; 135 136 /* 137 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to 138 * userspace. That also has the effect of restoring the non-volatile 139 * GPRs, so we saved them on the way in here. 140 */ 141 ti = current_thread_info(); 142 ti->flags |= _TIF_RESTOREALL; 143 144 return 0; 145 } 146