linux-user/uname.c

   1 /*
   2  *  cpu to uname machine name map
   3  *
   4  *  Copyright (c) 2009 Loïc Minier
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21
  22 #include "qemu.h"
  23 #include "user-internals.h"
  24 //#include "qemu-common.h"
  25 #include "uname.h"
  26
  27 /* return highest utsname machine name for emulated instruction set
  28  *
  29  * NB: the default emulated CPU ("any") might not match any existing CPU, e.g.
  30  * on ARM it has all features turned on, so there is no perfect arch string to
  31  * return here */
  32 const char *cpu_to_uname_machine(void *cpu_env)
  33 {
  34 #if defined(TARGET_ARM) && !defined(TARGET_AARCH64)
  35
  36     /* utsname machine name on linux arm is CPU arch name + endianness, e.g.
  37      * armv7l; to get a list of CPU arch names from the linux source, use:
  38      *     grep arch_name: -A1 linux/arch/arm/mm/proc-*.S
  39      * see arch/arm/kernel/setup.c: setup_processor()
  40      */
  41
  42     /* in theory, endianness is configurable on some ARM CPUs, but this isn't
  43      * used in user mode emulation */
  44 #ifdef TARGET_WORDS_BIGENDIAN
  45 #define utsname_suffix "b"
  46 #else
  47 #define utsname_suffix "l"
  48 #endif
  49     if (arm_feature(cpu_env, ARM_FEATURE_V7))
  50         return "armv7" utsname_suffix;
  51     if (arm_feature(cpu_env, ARM_FEATURE_V6))
  52         return "armv6" utsname_suffix;
  53     /* earliest emulated CPU is ARMv5TE; qemu can emulate the 1026, but not its
  54      * Jazelle support */
  55     return "armv5te" utsname_suffix;
  56 #elif defined(TARGET_I386) && !defined(TARGET_X86_64)
  57     /* see arch/x86/kernel/cpu/bugs.c: check_bugs(), 386, 486, 586, 686 */
  58     CPUState *cpu = env_cpu((CPUX86State *)cpu_env);
  59     int family = object_property_get_int(OBJECT(cpu), "family", NULL);
  60     if (family == 4) {
  61         return "i486";
  62     }
  63     if (family == 5) {
  64         return "i586";
  65     }
  66     return "i686";
  67 #else
  68     /* default is #define-d in each arch/ subdir */
  69     return UNAME_MACHINE;
  70 #endif
  71 }
  72
  73
  74 #define COPY_UTSNAME_FIELD(dest, src) \
  75   do { \
  76       memcpy((dest), (src), MIN(sizeof(src), sizeof(dest))); \
  77       (dest)[sizeof(dest) - 1] = '\0'; \
  78   } while (0)
  79
  80 int sys_uname(struct new_utsname *buf)
  81 {
  82   struct utsname uts_buf;
  83
  84   if (uname(&uts_buf) < 0)
  85       return (-1);
  86
  87   /*
  88    * Just in case these have some differences, we
  89    * translate utsname to new_utsname (which is the
  90    * struct linux kernel uses).
  91    */
  92
  93   memset(buf, 0, sizeof(*buf));
  94   COPY_UTSNAME_FIELD(buf->sysname, uts_buf.sysname);
  95   COPY_UTSNAME_FIELD(buf->nodename, uts_buf.nodename);
  96   COPY_UTSNAME_FIELD(buf->release, uts_buf.release);
  97   COPY_UTSNAME_FIELD(buf->version, uts_buf.version);
  98   COPY_UTSNAME_FIELD(buf->machine, uts_buf.machine);
  99 #ifdef _GNU_SOURCE
 100   COPY_UTSNAME_FIELD(buf->domainname, uts_buf.domainname);
 101 #endif
 102   return (0);
 103
 104 #undef COPY_UTSNAME_FIELD
 105 }
 106
 107 static int relstr_to_int(const char *s)
 108 {
 109     /* Convert a uname release string like "2.6.18" to an integer
 110      * of the form 0x020612. (Beware that 0x020612 is *not* 2.6.12.)
 111      */
 112     int i, n, tmp;
 113
 114     tmp = 0;
 115     for (i = 0; i < 3; i++) {
 116         n = 0;
 117         while (*s >= '0' && *s <= '9') {
 118             n *= 10;
 119             n += *s - '0';
 120             s++;
 121         }
 122         tmp = (tmp << 8) + n;
 123         if (*s == '.') {
 124             s++;
 125         }
 126     }
 127     return tmp;
 128 }
 129
 130 int get_osversion(void)
 131 {
 132     static int osversion;
 133     struct new_utsname buf;
 134     const char *s;
 135
 136     if (osversion)
 137         return osversion;
 138     if (qemu_uname_release && *qemu_uname_release) {
 139         s = qemu_uname_release;
 140     } else {
 141         if (sys_uname(&buf))
 142             return 0;
 143         s = buf.release;
 144     }
 145     osversion = relstr_to_int(s);
 146     return osversion;
 147 }
 148
 149 void init_qemu_uname_release(void)
 150 {
 151     /* Initialize qemu_uname_release for later use.
 152      * If the host kernel is too old and the user hasn't asked for
 153      * a specific fake version number, we might want to fake a minimum
 154      * target kernel version.
 155      */
 156     struct new_utsname buf;
 157
 158     if (qemu_uname_release && *qemu_uname_release) {
 159         return;
 160     }
 161
 162     if (sys_uname(&buf)) {
 163         return;
 164     }
 165
 166     if (relstr_to_int(buf.release) < relstr_to_int(UNAME_MINIMUM_RELEASE)) {
 167         qemu_uname_release = UNAME_MINIMUM_RELEASE;
 168     }
 169 }