1 /* 2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk (at) cs.few.eur.nl> 3 * Copyright (c) 1993 Branko Lankester <branko (at) hacktic.nl> 4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs (at) world.std.com> 5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert (at) cistron.nl> 6 * Copyright (c) 2002-2005 Roland McGrath <roland (at) redhat.com> 7 * Copyright (c) 2009 Andreas Schwab <schwab (at) redhat.com> 8 * Copyright (c) 2012 H.J. Lu <hongjiu.lu (at) intel.com> 9 * Copyright (c) 2013 Denys Vlasenko <vda.linux (at) googlemail.com> 10 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv (at) altlinux.org> 11 * All rights reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include "defs.h" 37 38 #include "xlat/whence_codes.h" 39 40 /* Linux kernel has exactly one version of lseek: 41 * fs/read_write.c::SYSCALL_DEFINE3(lseek, unsigned, fd, off_t, offset, unsigned, origin) 42 * In kernel, off_t is always the same as (kernel's) long 43 * (see include/uapi/asm-generic/posix_types.h), 44 * which means that on x32 we need to use tcp->ext_arg[N] to get offset argument. 45 * Use test/x32_lseek.c to test lseek decoding. 46 */ 47 #if defined(LINUX_MIPSN32) || defined(X32) 48 SYS_FUNC(lseek) 49 { 50 long long offset; 51 int whence; 52 53 printfd(tcp, tcp->u_arg[0]); 54 # ifdef X32 55 /* tcp->ext_arg is not initialized for i386 personality */ 56 if (current_personality == 1) 57 offset = tcp->u_arg[1]; 58 else 59 # endif 60 offset = tcp->ext_arg[1]; 61 whence = tcp->u_arg[2]; 62 if (whence == SEEK_SET) 63 tprintf(", %llu, ", offset); 64 else 65 tprintf(", %lld, ", offset); 66 printxval(whence_codes, whence, "SEEK_???"); 67 68 return RVAL_DECODED | RVAL_LUDECIMAL; 69 } 70 #else 71 SYS_FUNC(lseek) 72 { 73 long offset; 74 int whence; 75 76 printfd(tcp, tcp->u_arg[0]); 77 offset = tcp->u_arg[1]; 78 whence = tcp->u_arg[2]; 79 if (whence == SEEK_SET) 80 tprintf(", %lu, ", offset); 81 else 82 tprintf(", %ld, ", offset); 83 printxval(whence_codes, whence, "SEEK_???"); 84 85 return RVAL_DECODED | RVAL_UDECIMAL; 86 } 87 #endif 88 89 /* llseek syscall takes explicitly two ulong arguments hi, lo, 90 * rather than one 64-bit argument for which LONG_LONG works 91 * appropriate for the native byte order. 92 * 93 * See kernel's fs/read_write.c::SYSCALL_DEFINE5(llseek, ...) 94 * 95 * hi,lo are "unsigned longs" and combined exactly this way in kernel: 96 * ((loff_t) hi << 32) | lo 97 * Note that for architectures with kernel's long wider than userspace long 98 * (such as x32), combining code will use *kernel's*, i.e. *wide* longs 99 * for hi and lo. We would need to use tcp->ext_arg[N] on x32... 100 * ...however, x32 (and x86_64) does not _have_ llseek syscall as such. 101 */ 102 SYS_FUNC(llseek) 103 { 104 if (entering(tcp)) { 105 printfd(tcp, tcp->u_arg[0]); 106 if (tcp->u_arg[4] == SEEK_SET) 107 tprintf(", %llu, ", 108 ((long long) tcp->u_arg[1]) << 32 | 109 (unsigned long long) (unsigned) tcp->u_arg[2]); 110 else 111 tprintf(", %lld, ", 112 ((long long) tcp->u_arg[1]) << 32 | 113 (unsigned long long) (unsigned) tcp->u_arg[2]); 114 } else { 115 printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64); 116 tprints(", "); 117 printxval(whence_codes, tcp->u_arg[4], "SEEK_???"); 118 } 119 return 0; 120 } 121
