summaryrefslogtreecommitdiffstats
path: root/qemu/linux-user/uname.c
blob: 313b79dbad477a0f1e39595140f624b126c63323 (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
/*
 *  cpu to uname machine name map
 *
 *  Copyright (c) 2009 Loïc Minier
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu/osdep.h"

#include "qemu.h"
//#include "qemu-common.h"
#include "uname.h"

/* return highest utsname machine name for emulated instruction set
 *
 * NB: the default emulated CPU ("any") might not match any existing CPU, e.g.
 * on ARM it has all features turned on, so there is no perfect arch string to
 * return here */
const char *cpu_to_uname_machine(void *cpu_env)
{
#if defined(TARGET_ARM) && !defined(TARGET_AARCH64)

    /* utsname machine name on linux arm is CPU arch name + endianness, e.g.
     * armv7l; to get a list of CPU arch names from the linux source, use:
     *     grep arch_name: -A1 linux/arch/arm/mm/proc-*.S
     * see arch/arm/kernel/setup.c: setup_processor()
     */

    /* in theory, endianness is configurable on some ARM CPUs, but this isn't
     * used in user mode emulation */
#ifdef TARGET_WORDS_BIGENDIAN
#define utsname_suffix "b"
#else
#define utsname_suffix "l"
#endif
    if (arm_feature(cpu_env, ARM_FEATURE_V7))
        return "armv7" utsname_suffix;
    if (arm_feature(cpu_env, ARM_FEATURE_V6))
        return "armv6" utsname_suffix;
    /* earliest emulated CPU is ARMv5TE; qemu can emulate the 1026, but not its
     * Jazelle support */
    return "armv5te" utsname_suffix;
#elif defined(TARGET_I386) && !defined(TARGET_X86_64)
    /* see arch/x86/kernel/cpu/bugs.c: check_bugs(), 386, 486, 586, 686 */
    CPUState *cpu = ENV_GET_CPU((CPUX86State *)cpu_env);
    int family = object_property_get_int(OBJECT(cpu), "family", NULL);
    if (family == 4) {
        return "i486";
    }
    if (family == 5) {
        return "i586";
    }
    return "i686";
#else
    /* default is #define-d in each arch/ subdir */
    return UNAME_MACHINE;
#endif
}


#define COPY_UTSNAME_FIELD(dest, src) \
  do { \
      /* __NEW_UTS_LEN doesn't include terminating null */ \
      (void) strncpy((dest), (src), __NEW_UTS_LEN); \
      (dest)[__NEW_UTS_LEN] = '\0'; \
  } while (0)

int sys_uname(struct new_utsname *buf)
{
  struct utsname uts_buf;

  if (uname(&uts_buf) < 0)
      return (-1);

  /*
   * Just in case these have some differences, we
   * translate utsname to new_utsname (which is the
   * struct linux kernel uses).
   */

  memset(buf, 0, sizeof(*buf));
  COPY_UTSNAME_FIELD(buf->sysname, uts_buf.sysname);
  COPY_UTSNAME_FIELD(buf->nodename, uts_buf.nodename);
  COPY_UTSNAME_FIELD(buf->release, uts_buf.release);
  COPY_UTSNAME_FIELD(buf->version, uts_buf.version);
  COPY_UTSNAME_FIELD(buf->machine, uts_buf.machine);
#ifdef _GNU_SOURCE
  COPY_UTSNAME_FIELD(buf->domainname, uts_buf.domainname);
#endif
  return (0);

#undef COPY_UTSNAME_FIELD
}

static int relstr_to_int(const char *s)
{
    /* Convert a uname release string like "2.6.18" to an integer
     * of the form 0x020612. (Beware that 0x020612 is *not* 2.6.12.)
     */
    int i, n, tmp;

    tmp = 0;
    for (i = 0; i < 3; i++) {
        n = 0;
        while (*s >= '0' && *s <= '9') {
            n *= 10;
            n += *s - '0';
            s++;
        }
        tmp = (tmp << 8) + n;
        if (*s == '.') {
            s++;
        }
    }
    return tmp;
}

int get_osversion(void)
{
    static int osversion;
    struct new_utsname buf;
    const char *s;

    if (osversion)
        return osversion;
    if (qemu_uname_release && *qemu_uname_release) {
        s = qemu_uname_release;
    } else {
        if (sys_uname(&buf))
            return 0;
        s = buf.release;
    }
    osversion = relstr_to_int(s);
    return osversion;
}

void init_qemu_uname_release(void)
{
    /* Initialize qemu_uname_release for later use.
     * If the host kernel is too old and the user hasn't asked for
     * a specific fake version number, we might want to fake a minimum
     * target kernel version.
     */
    struct new_utsname buf;

    if (qemu_uname_release && *qemu_uname_release) {
        return;
    }

    if (sys_uname(&buf)) {
        return;
    }

    if (relstr_to_int(buf.release) < relstr_to_int(UNAME_MINIMUM_RELEASE)) {
        qemu_uname_release = UNAME_MINIMUM_RELEASE;
    }
}