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 /*
  93  * Variants for the return value output function
  94  */
  95
  96 static void print_syscall_ret_addr(const struct syscallname *name, abi_long ret)
  97 {
  98     if (ret == -1) {
  99         gemu_log(" = -1 errno=%d (%s)\n", errno, strerror(errno));
 100     } else {
 101         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 102     }
 103 }
 104
 105 #if 0 /* currently unused */
 106 static void
 107 print_syscall_ret_raw(struct syscallname *name, abi_long ret)
 108 {
 109         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 110 }
 111 #endif
 112
 113 /*
 114  * An array of all of the syscalls we know about
 115  */
 116
 117 static const struct syscallname freebsd_scnames[] = {
 118 #include "freebsd/strace.list"
 119 };
 120 static const struct syscallname netbsd_scnames[] = {
 121 #include "netbsd/strace.list"
 122 };
 123 static const struct syscallname openbsd_scnames[] = {
 124 #include "openbsd/strace.list"
 125 };
 126
 127 static void print_syscall(int num, const struct syscallname *scnames,
 128         unsigned int nscnames, abi_long arg1, abi_long arg2, abi_long arg3,
 129         abi_long arg4, abi_long arg5, abi_long arg6)
 130 {
 131     unsigned int i;
 132     const char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ","
 133         TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ","
 134         TARGET_ABI_FMT_ld ")";
 135
 136     gemu_log("%d ", getpid() );
 137
 138     for (i = 0; i < nscnames; i++) {
 139         if (scnames[i].nr == num) {
 140             if (scnames[i].call != NULL) {
 141                 scnames[i].call(&scnames[i], arg1, arg2, arg3, arg4, arg5,
 142                         arg6);
 143             } else {
 144                 /* XXX: this format system is broken because it uses
 145                    host types and host pointers for strings */
 146                 if (scnames[i].format != NULL) {
 147                     format = scnames[i].format;
 148                 }
 149                 gemu_log(format, scnames[i].name, arg1, arg2, arg3, arg4, arg5,
 150                         arg6);
 151             }
 152             return;
 153         }
 154     }
 155     gemu_log("Unknown syscall %d\n", num);
 156 }
 157
 158 static void print_syscall_ret(int num, abi_long ret,
 159         const struct syscallname *scnames, unsigned int nscnames)
 160 {
 161     unsigned int i;
 162
 163     for (i = 0; i < nscnames; i++) {
 164         if (scnames[i].nr == num) {
 165             if (scnames[i].result != NULL) {
 166                 scnames[i].result(&scnames[i], ret);
 167             } else {
 168                 if (ret < 0) {
 169                     gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret,
 170                              strerror(-ret));
 171                 } else {
 172                     gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret);
 173                 }
 174             }
 175             break;
 176         }
 177     }
 178 }
 179
 180 /*
 181  * The public interface to this module.
 182  */
 183 void print_freebsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 184         abi_long arg4, abi_long arg5, abi_long arg6)
 185 {
 186
 187     print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames), arg1, arg2,
 188             arg3, arg4, arg5, arg6);
 189 }
 190
 191 void print_freebsd_syscall_ret(int num, abi_long ret)
 192 {
 193
 194     print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames));
 195 }
 196
 197 void print_netbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 198         abi_long arg4, abi_long arg5, abi_long arg6)
 199 {
 200
 201     print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames),
 202                   arg1, arg2, arg3, arg4, arg5, arg6);
 203 }
 204
 205 void print_netbsd_syscall_ret(int num, abi_long ret)
 206 {
 207
 208     print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames));
 209 }
 210
 211 void print_openbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 212         abi_long arg4, abi_long arg5, abi_long arg6)
 213 {
 214
 215     print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames), arg1, arg2,
 216             arg3, arg4, arg5, arg6);
 217 }
 218
 219 void print_openbsd_syscall_ret(int num, abi_long ret)
 220 {
 221
 222     print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames));
 223 }