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 "uname.h"
  25
  26 /* return highest utsname machine name for emulated instruction set
  27  *
  28  * NB: the default emulated CPU ("any") might not match any existing CPU, e.g.
  29  * on ARM it has all features turned on, so there is no perfect arch string to
  30  * return here */
  31 const char *cpu_to_uname_machine(void *cpu_env)
  32 {
  33 #if defined(TARGET_ARM) && !defined(TARGET_AARCH64)
  34
  35     /* utsname machine name on linux arm is CPU arch name + endianness, e.g.
  36      * armv7l; to get a list of CPU arch names from the linux source, use:
  37      *     grep arch_name: -A1 linux/arch/arm/mm/proc-*.S
  38      * see arch/arm/kernel/setup.c: setup_processor()
  39      */
  40
  41     /* in theory, endianness is configurable on some ARM CPUs, but this isn't
  42      * used in user mode emulation */
  43 #if TARGET_BIG_ENDIAN
  44 #define utsname_suffix "b"
  45 #else
  46 #define utsname_suffix "l"
  47 #endif
  48     if (arm_feature(cpu_env, ARM_FEATURE_V7))
  49         return "armv7" utsname_suffix;
  50     if (arm_feature(cpu_env, ARM_FEATURE_V6))
  51         return "armv6" utsname_suffix;
  52     /* earliest emulated CPU is ARMv5TE; qemu can emulate the 1026, but not its
  53      * Jazelle support */
  54     return "armv5te" utsname_suffix;
  55 #elif defined(TARGET_I386) && !defined(TARGET_X86_64)
  56     /* see arch/x86/kernel/cpu/bugs.c: check_bugs(), 386, 486, 586, 686 */
  57     CPUState *cpu = env_cpu((CPUX86State *)cpu_env);
  58     int family = object_property_get_int(OBJECT(cpu), "family", NULL);
  59     if (family == 4) {
  60         return "i486";
  61     }
  62     if (family == 5) {
  63         return "i586";
  64     }
  65     return "i686";
  66 #else
  67     /* default is #define-d in each arch/ subdir */
  68     return UNAME_MACHINE;
  69 #endif
  70 }
  71
  72
  73 #define COPY_UTSNAME_FIELD(dest, src) \
  74   do { \
  75       memcpy((dest), (src), MIN(sizeof(src), sizeof(dest))); \
  76       (dest)[sizeof(dest) - 1] = '\0'; \
  77   } while (0)
  78
  79 int sys_uname(struct new_utsname *buf)
  80 {
  81   struct utsname uts_buf;
  82
  83   if (uname(&uts_buf) < 0)
  84       return (-1);
  85
  86   /*
  87    * Just in case these have some differences, we
  88    * translate utsname to new_utsname (which is the
  89    * struct linux kernel uses).
  90    */
  91
  92   memset(buf, 0, sizeof(*buf));
  93   COPY_UTSNAME_FIELD(buf->sysname, uts_buf.sysname);
  94   COPY_UTSNAME_FIELD(buf->nodename, uts_buf.nodename);
  95   COPY_UTSNAME_FIELD(buf->release, uts_buf.release);
  96   COPY_UTSNAME_FIELD(buf->version, uts_buf.version);
  97   COPY_UTSNAME_FIELD(buf->machine, uts_buf.machine);
  98 #ifdef _GNU_SOURCE
  99   COPY_UTSNAME_FIELD(buf->domainname, uts_buf.domainname);
 100 #endif
 101   return (0);
 102
 103 #undef COPY_UTSNAME_FIELD
 104 }
 105
 106 static int relstr_to_int(const char *s)
 107 {
 108     /* Convert a uname release string like "2.6.18" to an integer
 109      * of the form 0x020612. (Beware that 0x020612 is *not* 2.6.12.)
 110      */
 111     int i, n, tmp;
 112
 113     tmp = 0;
 114     for (i = 0; i < 3; i++) {
 115         n = 0;
 116         while (*s >= '0' && *s <= '9') {
 117             n *= 10;
 118             n += *s - '0';
 119             s++;
 120         }
 121         tmp = (tmp << 8) + n;
 122         if (*s == '.') {
 123             s++;
 124         }
 125     }
 126     return tmp;
 127 }
 128
 129 int get_osversion(void)
 130 {
 131     static int osversion;
 132     struct new_utsname buf;
 133     const char *s;
 134
 135     if (osversion)
 136         return osversion;
 137     if (qemu_uname_release && *qemu_uname_release) {
 138         s = qemu_uname_release;
 139     } else {
 140         if (sys_uname(&buf))
 141             return 0;
 142         s = buf.release;
 143     }
 144     osversion = relstr_to_int(s);
 145     return osversion;
 146 }
 147
 148 void init_qemu_uname_release(void)
 149 {
 150     /* Initialize qemu_uname_release for later use.
 151      * If the host kernel is too old and the user hasn't asked for
 152      * a specific fake version number, we might want to fake a minimum
 153      * target kernel version.
 154      */
 155     struct new_utsname buf;
 156
 157     if (qemu_uname_release && *qemu_uname_release) {
 158         return;
 159     }
 160
 161     if (sys_uname(&buf)) {
 162         return;
 163     }
 164
 165     if (relstr_to_int(buf.release) < relstr_to_int(UNAME_MINIMUM_RELEASE)) {
 166         qemu_uname_release = UNAME_MINIMUM_RELEASE;
 167     }
 168 }