bsd-user/strace.c

   1 /*
   2  *  System call tracing and debugging
   3  *
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "qemu/osdep.h"
  20 #include <sys/select.h>
  21 #include <sys/syscall.h>
  22 #include <sys/ioccom.h>
  23
  24 #include "qemu.h"
  25
  26 int do_strace;
  27
  28 /*
  29  * Utility functions
  30  */
  31
  32 static void print_sysctl(const struct syscallname *name, abi_long arg1,
  33         abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5,
  34         abi_long arg6)
  35 {
  36     uint32_t i;
  37     int32_t *namep;
  38
  39     gemu_log("%s({ ", name->name);
  40     namep = lock_user(VERIFY_READ, arg1, sizeof(int32_t) * arg2, 1);
  41     if (namep) {
  42         int32_t *p = namep;
  43
  44         for (i = 0; i < (uint32_t)arg2; i++) {
  45             gemu_log("%d ", tswap32(*p++));
  46         }
  47         unlock_user(namep, arg1, 0);
  48     }
  49     gemu_log("}, %u, 0x" TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ", 0x"
  50         TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ")",
  51         (uint32_t)arg2, arg3, arg4, arg5, arg6);
  52 }
  53
  54 static void print_execve(const struct syscallname *name, abi_long arg1,
  55         abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5,
  56         abi_long arg6)
  57 {
  58     abi_ulong arg_ptr_addr;
  59     char *s;
  60
  61     s = lock_user_string(arg1);
  62     if (s == NULL) {
  63         return;
  64     }
  65     gemu_log("%s(\"%s\",{", name->name, s);
  66     unlock_user(s, arg1, 0);
  67
  68     for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) {
  69         abi_ulong *arg_ptr, arg_addr;
  70
  71         arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1);
  72         if (!arg_ptr) {
  73             return;
  74         }
  75         arg_addr = tswapl(*arg_ptr);
  76         unlock_user(arg_ptr, arg_ptr_addr, 0);
  77         if (!arg_addr) {
  78             break;
  79         }
  80         if ((s = lock_user_string(arg_addr))) {
  81             gemu_log("\"%s\",", s);
  82             unlock_user(s, arg_addr, 0);
  83         }
  84     }
  85     gemu_log("NULL})");
  86 }
  87
  88 static void print_ioctl(const struct syscallname *name,
  89         abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4,
  90         abi_long arg5, abi_long arg6)
  91 {
  92     /* Decode the ioctl request */
  93     gemu_log("%s(%d, 0x%0lx { IO%s%s GRP:0x%x('%c') CMD:%d LEN:%d }, 0x"
  94             TARGET_ABI_FMT_lx ", ...)",
  95             name->name,
  96             (int)arg1,
  97             (unsigned long)arg2,
  98             arg2 & IOC_OUT ? "R" : "",
  99             arg2 & IOC_IN ? "W" : "",
 100             (unsigned)IOCGROUP(arg2),
 101             isprint(IOCGROUP(arg2)) ? (char)IOCGROUP(arg2) : '?',
 102             (int)arg2 & 0xFF,
 103             (int)IOCPARM_LEN(arg2),
 104             arg3);
 105 }
 106
 107 /*
 108  * Variants for the return value output function
 109  */
 110
 111 static void print_syscall_ret_addr(const struct syscallname *name, abi_long ret)
 112 {
 113     if (ret == -1) {
 114         gemu_log(" = -1 errno=%d (%s)\n", errno, strerror(errno));
 115     } else {
 116         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 117     }
 118 }
 119
 120 #if 0 /* currently unused */
 121 static void
 122 print_syscall_ret_raw(struct syscallname *name, abi_long ret)
 123 {
 124         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 125 }
 126 #endif
 127
 128 /*
 129  * An array of all of the syscalls we know about
 130  */
 131
 132 static const struct syscallname freebsd_scnames[] = {
 133 #include "freebsd/strace.list"
 134 };
 135 static const struct syscallname netbsd_scnames[] = {
 136 #include "netbsd/strace.list"
 137 };
 138 static const struct syscallname openbsd_scnames[] = {
 139 #include "openbsd/strace.list"
 140 };
 141
 142 static void print_syscall(int num, const struct syscallname *scnames,
 143         unsigned int nscnames, abi_long arg1, abi_long arg2, abi_long arg3,
 144         abi_long arg4, abi_long arg5, abi_long arg6)
 145 {
 146     unsigned int i;
 147     const char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ","
 148         TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ","
 149         TARGET_ABI_FMT_ld ")";
 150
 151     gemu_log("%d ", getpid() );
 152
 153     for (i = 0; i < nscnames; i++) {
 154         if (scnames[i].nr == num) {
 155             if (scnames[i].call != NULL) {
 156                 scnames[i].call(&scnames[i], arg1, arg2, arg3, arg4, arg5,
 157                         arg6);
 158             } else {
 159                 /* XXX: this format system is broken because it uses
 160                    host types and host pointers for strings */
 161                 if (scnames[i].format != NULL) {
 162                     format = scnames[i].format;
 163                 }
 164                 gemu_log(format, scnames[i].name, arg1, arg2, arg3, arg4, arg5,
 165                         arg6);
 166             }
 167             return;
 168         }
 169     }
 170     gemu_log("Unknown syscall %d\n", num);
 171 }
 172
 173 static void print_syscall_ret(int num, abi_long ret,
 174         const struct syscallname *scnames, unsigned int nscnames)
 175 {
 176     unsigned int i;
 177
 178     for (i = 0; i < nscnames; i++) {
 179         if (scnames[i].nr == num) {
 180             if (scnames[i].result != NULL) {
 181                 scnames[i].result(&scnames[i], ret);
 182             } else {
 183                 if (ret < 0) {
 184                     gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret,
 185                              strerror(-ret));
 186                 } else {
 187                     gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret);
 188                 }
 189             }
 190             break;
 191         }
 192     }
 193 }
 194
 195 /*
 196  * The public interface to this module.
 197  */
 198 void print_freebsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 199         abi_long arg4, abi_long arg5, abi_long arg6)
 200 {
 201
 202     print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames), arg1, arg2,
 203             arg3, arg4, arg5, arg6);
 204 }
 205
 206 void print_freebsd_syscall_ret(int num, abi_long ret)
 207 {
 208
 209     print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames));
 210 }
 211
 212 void print_netbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 213         abi_long arg4, abi_long arg5, abi_long arg6)
 214 {
 215
 216     print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames),
 217                   arg1, arg2, arg3, arg4, arg5, arg6);
 218 }
 219
 220 void print_netbsd_syscall_ret(int num, abi_long ret)
 221 {
 222
 223     print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames));
 224 }
 225
 226 void print_openbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 227         abi_long arg4, abi_long arg5, abi_long arg6)
 228 {
 229
 230     print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames), arg1, arg2,
 231             arg3, arg4, arg5, arg6);
 232 }
 233
 234 void print_openbsd_syscall_ret(int num, abi_long ret)
 235 {
 236
 237     print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames));
 238 }