summaryrefslogtreecommitdiffstats
path: root/bsd-user/strace.c
blob: d73bbcabab3af2a4f3ccefc0d015b8e55331be51 (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
#include <stdio.h>
#include <errno.h>
#include <sys/select.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/syscall.h>
#include "qemu.h"

int do_strace=0;

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

/*
 * Utility functions
 */

static void
print_execve(const 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;

        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, arg_addr, 0);
        }
    }

    gemu_log("NULL})");
}

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

static void
print_syscall_ret_addr(const struct syscallname *name, abi_long ret)
{
if( ret == -1 ) {
        gemu_log(" = -1 errno=%d (%s)\n", errno, 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

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

static const struct syscallname freebsd_scnames[] = {
#include "freebsd/strace.list"
};
static const struct syscallname netbsd_scnames[] = {
#include "netbsd/strace.list"
};
static const struct syscallname openbsd_scnames[] = {
#include "openbsd/strace.list"
};

static void
print_syscall(int num, const struct syscallname *scnames, unsigned int nscnames,
              abi_long arg1, abi_long arg2, abi_long arg3,
              abi_long arg4, abi_long arg5, abi_long arg6)
{
    unsigned int i;
    const 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 < nscnames; 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);
}

static void
print_syscall_ret(int num, abi_long ret, const struct syscallname *scnames,
                  unsigned int nscnames)
{
    unsigned int i;

    for (i = 0; i < nscnames; 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,
                             strerror(-ret));
                } else {
                    gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret);
                }
            }
            break;
        }
}

/*
 * The public interface to this module.
 */
void
print_freebsd_syscall(int num,
                      abi_long arg1, abi_long arg2, abi_long arg3,
                      abi_long arg4, abi_long arg5, abi_long arg6)
{
    print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames),
                  arg1, arg2, arg3, arg4, arg5, arg6);
}

void
print_freebsd_syscall_ret(int num, abi_long ret)
{
    print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames));
}

void
print_netbsd_syscall(int num,
                      abi_long arg1, abi_long arg2, abi_long arg3,
                      abi_long arg4, abi_long arg5, abi_long arg6)
{
    print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames),
                  arg1, arg2, arg3, arg4, arg5, arg6);
}

void
print_netbsd_syscall_ret(int num, abi_long ret)
{
    print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames));
}

void
print_openbsd_syscall(int num,
                      abi_long arg1, abi_long arg2, abi_long arg3,
                      abi_long arg4, abi_long arg5, abi_long arg6)
{
    print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames),
                  arg1, arg2, arg3, arg4, arg5, arg6);
}

void
print_openbsd_syscall_ret(int num, abi_long ret)
{
    print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames));
}
OpenPOWER on IntegriCloud