summaryrefslogtreecommitdiff
path: root/linux-user/strace.c
blob: 76aa3f609ef37fe1d256bef7e69978ae176f38b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
#include <stdio.h>
#include <errno.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/select.h>
#include <sys/types.h>
#include <unistd.h>
#include "qemu.h"

int do_strace=0;

struct syscallname {
    int nr;
    char *name;
    char *format;
    void (*call)(struct syscallname *,
                 abi_long, abi_long, abi_long,
                 abi_long, abi_long, abi_long);
    void (*result)(struct syscallname *, abi_long);
};

/*
 * Utility functions
 */
static void
print_ipc_cmd(int cmd)
{
#define output_cmd(val) \
if( cmd == val ) { \
    gemu_log(#val); \
    return; \
}

    cmd &= 0xff;

    /* General IPC commands */
    output_cmd( IPC_RMID );
    output_cmd( IPC_SET );
    output_cmd( IPC_STAT );
    output_cmd( IPC_INFO );
    /* msgctl() commands */
    #ifdef __USER_MISC
    output_cmd( MSG_STAT );
    output_cmd( MSG_INFO );
    #endif
    /* shmctl() commands */
    output_cmd( SHM_LOCK );
    output_cmd( SHM_UNLOCK );
    output_cmd( SHM_STAT );
    output_cmd( SHM_INFO );
    /* semctl() commands */
    output_cmd( GETPID );
    output_cmd( GETVAL );
    output_cmd( GETALL );
    output_cmd( GETNCNT );
    output_cmd( GETZCNT );
    output_cmd( SETVAL );
    output_cmd( SETALL );
    output_cmd( SEM_STAT );
    output_cmd( SEM_INFO );
    output_cmd( IPC_RMID );
    output_cmd( IPC_RMID );
    output_cmd( IPC_RMID );
    output_cmd( IPC_RMID );
    output_cmd( IPC_RMID );
    output_cmd( IPC_RMID );
    output_cmd( IPC_RMID );
    output_cmd( IPC_RMID );
    output_cmd( IPC_RMID );

    /* Some value we don't recognize */
    gemu_log("%d",cmd);
}

#ifdef TARGET_NR__newselect
static void
print_fdset(int n, abi_ulong target_fds_addr)
{
    int i;

    gemu_log("[");
    if( target_fds_addr ) {
        abi_long *target_fds;

        target_fds = lock_user(VERIFY_READ,
                               target_fds_addr,
                               sizeof(*target_fds)*(n / TARGET_ABI_BITS + 1),
                               1);

        if (!target_fds)
            return;

        for (i=n; i>=0; i--) {
            if ((tswapl(target_fds[i / TARGET_ABI_BITS]) >> (i & (TARGET_ABI_BITS - 1))) & 1)
                gemu_log("%d,", i );
            }
        unlock_user(target_fds, target_fds_addr, 0);
    }
    gemu_log("]");
}

static void
print_timeval(abi_ulong tv_addr)
{
    if( tv_addr ) {
        struct target_timeval *tv;

        tv = lock_user(VERIFY_READ, tv_addr, sizeof(*tv), 1);
        if (!tv)
            return;
        gemu_log("{" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "}",
        	 tv->tv_sec, tv->tv_usec);
        unlock_user(tv, tv_addr, 0);
    } else
        gemu_log("NULL");
}
#endif

/*
 * Sysycall specific output functions
 */

/* select */
#ifdef TARGET_NR__newselect
static long newselect_arg1 = 0;
static long newselect_arg2 = 0;
static long newselect_arg3 = 0;
static long newselect_arg4 = 0;
static long newselect_arg5 = 0;

static void
print_newselect(struct syscallname *name,
                abi_long arg1, abi_long arg2, abi_long arg3,
                abi_long arg4, abi_long arg5, abi_long arg6)
{
    gemu_log("%s(" TARGET_ABI_FMT_ld ",", name->name, arg1);
    print_fdset(arg1, arg2);
    gemu_log(",");
    print_fdset(arg1, arg3);
    gemu_log(",");
    print_fdset(arg1, arg4);
    gemu_log(",");
    print_timeval(arg5);
    gemu_log(")");

    /* save for use in the return output function below */
    newselect_arg1=arg1;
    newselect_arg2=arg2;
    newselect_arg3=arg3;
    newselect_arg4=arg4;
    newselect_arg5=arg5;
}
#endif

static void
print_semctl(struct syscallname *name,
             abi_long arg1, abi_long arg2, abi_long arg3,
             abi_long arg4, abi_long arg5, abi_long arg6)
{
    gemu_log("%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ",", name->name, arg1, arg2);
    print_ipc_cmd(arg3);
    gemu_log(",0x" TARGET_ABI_FMT_lx ")", arg4);
}

static void
print_execve(struct syscallname *name,
             abi_long arg1, abi_long arg2, abi_long arg3,
             abi_long arg4, abi_long arg5, abi_long arg6)
{
    abi_ulong arg_ptr_addr;
    char *s;

    if (!(s = lock_user_string(arg1)))
        return;
    gemu_log("%s(\"%s\",{", name->name, s);
    unlock_user(s, arg1, 0);

    for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) {
        abi_ulong *arg_ptr, arg_addr, s_addr;

	arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1);
        if (!arg_ptr)
            return;
	arg_addr = tswapl(*arg_ptr);
	unlock_user(arg_ptr, arg_ptr_addr, 0);
        if (!arg_addr)
            break;
        if ((s = lock_user_string(arg_addr))) {
            gemu_log("\"%s\",", s);
            unlock_user(s, s_addr, 0);
        }
    }

    gemu_log("NULL})");
}

#ifdef TARGET_NR_ipc
static void
print_ipc(struct syscallname *name,
          abi_long arg1, abi_long arg2, abi_long arg3,
          abi_long arg4, abi_long arg5, abi_long arg6)
{
    switch(arg1) {
    case IPCOP_semctl:
        name->name = "semctl";
        print_semctl(name,arg2,arg3,arg4,arg5,arg6,0);
        break;
    default:
        gemu_log("%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ")",
                 name->name, arg1, arg2, arg3, arg4);
    }
}
#endif

/*
 * Variants for the return value output function
 */

static void
print_syscall_ret_addr(struct syscallname *name, abi_long ret)
{
if( ret == -1 ) {
        gemu_log(" = -1 errno=%d (%s)\n", errno, target_strerror(errno));
    } else {
        gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
    }
}

#if 0 /* currently unused */
static void
print_syscall_ret_raw(struct syscallname *name, abi_long ret)
{
        gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
}
#endif

#ifdef TARGET_NR__newselect
static void
print_syscall_ret_newselect(struct syscallname *name, abi_long ret)
{
    gemu_log(" = 0x" TARGET_ABI_FMT_lx " (", ret);
    print_fdset(newselect_arg1,newselect_arg2);
    gemu_log(",");
    print_fdset(newselect_arg1,newselect_arg3);
    gemu_log(",");
    print_fdset(newselect_arg1,newselect_arg4);
    gemu_log(",");
    print_timeval(newselect_arg5);
    gemu_log(")\n");
}
#endif

/*
 * An array of all of the syscalls we know about
 */

static struct syscallname scnames[] = {
#include "strace.list"
};

static int nsyscalls = sizeof(scnames)/sizeof(struct syscallname);

/*
 * The public interface to this module.
 */
void
print_syscall(int num,
              abi_long arg1, abi_long arg2, abi_long arg3,
              abi_long arg4, abi_long arg5, abi_long arg6)
{
    int i;
    char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ")";

    gemu_log("%d ", getpid() );

    for(i=0;i<nsyscalls;i++)
        if( scnames[i].nr == num ) {
            if( scnames[i].call != NULL ) {
                scnames[i].call(&scnames[i],arg1,arg2,arg3,arg4,arg5,arg6);
            } else {
                /* XXX: this format system is broken because it uses
                   host types and host pointers for strings */
                if( scnames[i].format != NULL )
                    format = scnames[i].format;
                gemu_log(format,scnames[i].name, arg1,arg2,arg3,arg4,arg5,arg6);
            }
            return;
        }
    gemu_log("Unknown syscall %d\n", num);
}


void
print_syscall_ret(int num, abi_long ret)
{
    int i;

    for(i=0;i<nsyscalls;i++)
        if( scnames[i].nr == num ) {
            if( scnames[i].result != NULL ) {
                scnames[i].result(&scnames[i],ret);
            } else {
                if( ret < 0 ) {
                    gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret, target_strerror(-ret));
                } else {
                    gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret);
                }
            }
            break;
        }
}