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 <stdio.h>
  20 #include <errno.h>
  21 #include <sys/select.h>
  22 #include <sys/types.h>
  23 #include <unistd.h>
  24 #include <sys/syscall.h>
  25 #include <sys/ioccom.h>
  26 #include <ctype.h>
  27
  28 #include "qemu.h"
  29
  30 int do_strace;
  31
  32 /*
  33  * Utility functions
  34  */
  35
  36 static void print_sysctl(const struct syscallname *name, abi_long arg1,
  37         abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5,
  38         abi_long arg6)
  39 {
  40     uint32_t i;
  41     int32_t *namep;
  42
  43     gemu_log("%s({ ", name->name);
  44     namep = lock_user(VERIFY_READ, arg1, sizeof(int32_t) * arg2, 1);
  45     if (namep) {
  46         int32_t *p = namep;
  47
  48         for (i = 0; i < (uint32_t)arg2; i++) {
  49             gemu_log("%d ", tswap32(*p++));
  50         }
  51         unlock_user(namep, arg1, 0);
  52     }
  53     gemu_log("}, %u, 0x" TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ", 0x"
  54         TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ")",
  55         (uint32_t)arg2, arg3, arg4, arg5, arg6);
  56 }
  57
  58 static void print_execve(const struct syscallname *name, abi_long arg1,
  59         abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5,
  60         abi_long arg6)
  61 {
  62     abi_ulong arg_ptr_addr;
  63     char *s;
  64
  65     s = lock_user_string(arg1);
  66     if (s == NULL) {
  67         return;
  68     }
  69     gemu_log("%s(\"%s\",{", name->name, s);
  70     unlock_user(s, arg1, 0);
  71
  72     for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) {
  73         abi_ulong *arg_ptr, arg_addr;
  74
  75         arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1);
  76         if (!arg_ptr) {
  77             return;
  78         }
  79         arg_addr = tswapl(*arg_ptr);
  80         unlock_user(arg_ptr, arg_ptr_addr, 0);
  81         if (!arg_addr) {
  82             break;
  83         }
  84         if ((s = lock_user_string(arg_addr))) {
  85             gemu_log("\"%s\",", s);
  86             unlock_user(s, arg_addr, 0);
  87         }
  88     }
  89     gemu_log("NULL})");
  90 }
  91
  92 static void print_ioctl(const struct syscallname *name,
  93         abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4,
  94         abi_long arg5, abi_long arg6)
  95 {
  96     /* Decode the ioctl request */
  97     gemu_log("%s(%d, 0x%0lx { IO%s%s GRP:0x%x('%c') CMD:%d LEN:%d }, 0x"
  98             TARGET_ABI_FMT_lx ", ...)",
  99             name->name,
 100             (int)arg1,
 101             (unsigned long)arg2,
 102             arg2 & IOC_OUT ? "R" : "",
 103             arg2 & IOC_IN ? "W" : "",
 104             (unsigned)IOCGROUP(arg2),
 105             isprint(IOCGROUP(arg2)) ? (char)IOCGROUP(arg2) : '?',
 106             (int)arg2 & 0xFF,
 107             (int)IOCPARM_LEN(arg2),
 108             arg3);
 109 }
 110
 111 /*
 112  * Variants for the return value output function
 113  */
 114
 115 static void print_syscall_ret_addr(const struct syscallname *name, abi_long ret)
 116 {
 117     if (ret == -1) {
 118         gemu_log(" = -1 errno=%d (%s)\n", errno, strerror(errno));
 119     } else {
 120         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 121     }
 122 }
 123
 124 #if 0 /* currently unused */
 125 static void
 126 print_syscall_ret_raw(struct syscallname *name, abi_long ret)
 127 {
 128         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 129 }
 130 #endif
 131
 132 /*
 133  * An array of all of the syscalls we know about
 134  */
 135
 136 static const struct syscallname freebsd_scnames[] = {
 137 #include "freebsd/strace.list"
 138 };
 139 static const struct syscallname netbsd_scnames[] = {
 140 #include "netbsd/strace.list"
 141 };
 142 static const struct syscallname openbsd_scnames[] = {
 143 #include "openbsd/strace.list"
 144 };
 145
 146 static void print_syscall(int num, const struct syscallname *scnames,
 147         unsigned int nscnames, abi_long arg1, abi_long arg2, abi_long arg3,
 148         abi_long arg4, abi_long arg5, abi_long arg6)
 149 {
 150     unsigned int i;
 151     const char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ","
 152         TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ","
 153         TARGET_ABI_FMT_ld ")";
 154
 155     gemu_log("%d ", getpid() );
 156
 157     for (i = 0; i < nscnames; i++) {
 158         if (scnames[i].nr == num) {
 159             if (scnames[i].call != NULL) {
 160                 scnames[i].call(&scnames[i], arg1, arg2, arg3, arg4, arg5,
 161                         arg6);
 162             } else {
 163                 /* XXX: this format system is broken because it uses
 164                    host types and host pointers for strings */
 165                 if (scnames[i].format != NULL) {
 166                     format = scnames[i].format;
 167                 }
 168                 gemu_log(format, scnames[i].name, arg1, arg2, arg3, arg4, arg5,
 169                         arg6);
 170             }
 171             return;
 172         }
 173     }
 174     gemu_log("Unknown syscall %d\n", num);
 175 }
 176
 177 static void print_syscall_ret(int num, abi_long ret,
 178         const struct syscallname *scnames, unsigned int nscnames)
 179 {
 180     unsigned int i;
 181
 182     for (i = 0; i < nscnames; i++) {
 183         if (scnames[i].nr == num) {
 184             if (scnames[i].result != NULL) {
 185                 scnames[i].result(&scnames[i], ret);
 186             } else {
 187                 if (ret < 0) {
 188                     gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret,
 189                              strerror(-ret));
 190                 } else {
 191                     gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret);
 192                 }
 193             }
 194             break;
 195         }
 196     }
 197 }
 198
 199 /*
 200  * The public interface to this module.
 201  */
 202 void print_freebsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 203         abi_long arg4, abi_long arg5, abi_long arg6)
 204 {
 205
 206     print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames), arg1, arg2,
 207             arg3, arg4, arg5, arg6);
 208 }
 209
 210 void print_freebsd_syscall_ret(int num, abi_long ret)
 211 {
 212
 213     print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames));
 214 }
 215
 216 void print_netbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 217         abi_long arg4, abi_long arg5, abi_long arg6)
 218 {
 219
 220     print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames),
 221                   arg1, arg2, arg3, arg4, arg5, arg6);
 222 }
 223
 224 void print_netbsd_syscall_ret(int num, abi_long ret)
 225 {
 226
 227     print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames));
 228 }
 229
 230 void print_openbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 231         abi_long arg4, abi_long arg5, abi_long arg6)
 232 {
 233
 234     print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames), arg1, arg2,
 235             arg3, arg4, arg5, arg6);
 236 }
 237
 238 void print_openbsd_syscall_ret(int num, abi_long ret)
 239 {
 240
 241     print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames));
 242 }