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