1 /* 2 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv (at) altlinux.org> 3 * Copyright (c) 2014-2017 The strace developers. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "defs.h" 30 31 #include "xlat/kexec_load_flags.h" 32 #include "xlat/kexec_arch_values.h" 33 34 #ifndef KEXEC_ARCH_MASK 35 # define KEXEC_ARCH_MASK 0xffff0000 36 #endif 37 #ifndef KEXEC_SEGMENT_MAX 38 # define KEXEC_SEGMENT_MAX 16 39 #endif 40 41 static bool 42 print_seg(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data) 43 { 44 const kernel_ulong_t *seg; 45 kernel_ulong_t seg_buf[4]; 46 47 if (elem_size < sizeof(seg_buf)) { 48 unsigned int i; 49 50 for (i = 0; i < ARRAY_SIZE(seg_buf); ++i) 51 seg_buf[i] = ((unsigned int *) elem_buf)[i]; 52 seg = seg_buf; 53 } else { 54 seg = elem_buf; 55 } 56 57 tprints("{buf="); 58 printaddr(seg[0]); 59 tprintf(", bufsz=%" PRI_klu ", mem=", seg[1]); 60 printaddr(seg[2]); 61 tprintf(", memsz=%" PRI_klu "}", seg[3]); 62 63 return true; 64 } 65 66 static void 67 print_kexec_segments(struct tcb *const tcp, const kernel_ulong_t addr, 68 const kernel_ulong_t len) 69 { 70 if (len > KEXEC_SEGMENT_MAX) { 71 printaddr(addr); 72 return; 73 } 74 75 kernel_ulong_t seg[4]; 76 const size_t sizeof_seg = ARRAY_SIZE(seg) * current_wordsize; 77 78 print_array(tcp, addr, len, seg, sizeof_seg, 79 umoven_or_printaddr, print_seg, 0); 80 } 81 82 SYS_FUNC(kexec_load) 83 { 84 /* entry, nr_segments */ 85 printaddr(tcp->u_arg[0]); 86 tprintf(", %" PRI_klu ", ", tcp->u_arg[1]); 87 88 /* segments */ 89 print_kexec_segments(tcp, tcp->u_arg[2], tcp->u_arg[1]); 90 tprints(", "); 91 92 /* flags */ 93 kernel_ulong_t n = tcp->u_arg[3]; 94 printxval64(kexec_arch_values, n & KEXEC_ARCH_MASK, "KEXEC_ARCH_???"); 95 n &= ~(kernel_ulong_t) KEXEC_ARCH_MASK; 96 if (n) { 97 tprints("|"); 98 printflags64(kexec_load_flags, n, "KEXEC_???"); 99 } 100 101 return RVAL_DECODED; 102 } 103 104 #include "xlat/kexec_file_load_flags.h" 105 106 SYS_FUNC(kexec_file_load) 107 { 108 /* kernel_fd */ 109 printfd(tcp, tcp->u_arg[0]); 110 tprints(", "); 111 /* initrd_fd */ 112 printfd(tcp, tcp->u_arg[1]); 113 tprints(", "); 114 /* cmdline_len */ 115 tprintf("%" PRI_klu ", ", tcp->u_arg[2]); 116 /* cmdline */ 117 printstrn(tcp, tcp->u_arg[3], tcp->u_arg[2]); 118 tprints(", "); 119 /* flags */ 120 printflags64(kexec_file_load_flags, tcp->u_arg[4], "KEXEC_FILE_???"); 121 122 return RVAL_DECODED; 123 } 124
