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Viewing changes to arch/x86/um/os-Linux/tls.c

  • Committer: Package Import Robot
  • Author(s): Paolo Pisati, Paolo Pisati
  • Date: 2011-12-06 15:56:07 UTC
  • Revision ID: package-import@ubuntu.com-20111206155607-pcf44kv5fmhk564f
Tags: 3.2.0-1401.1
[ Paolo Pisati ]

* Rebased on top of Ubuntu-3.2.0-3.8
* Tilt-tracking @ ef2487af4bb15bdd0689631774b5a5e3a59f74e2
* Delete debian.ti-omap4/control, it shoudln't be tracked
* Fix architecture spelling (s/armel/armhf/)
* [Config] Update configs following 3.2 import
* [Config] Fix compilation: disable CODA and ARCH_OMAP3
* [Config] Fix compilation: disable Ethernet Faraday
* Update series to precise

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arch/x86/um/os-Linux/tls.c
 
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#include <errno.h>
 
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#include <linux/unistd.h>
 
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#include <sys/ptrace.h>
 
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#include <sys/syscall.h>
 
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#include <unistd.h>
 
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#include "sysdep/tls.h"
 
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#ifndef PTRACE_GET_THREAD_AREA
 
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#define PTRACE_GET_THREAD_AREA 25
 
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#endif
 
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#ifndef PTRACE_SET_THREAD_AREA
 
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#define PTRACE_SET_THREAD_AREA 26
 
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#endif
 
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/* Checks whether host supports TLS, and sets *tls_min according to the value
 
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 * valid on the host.
 
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 * i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */
 
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void check_host_supports_tls(int *supports_tls, int *tls_min)
 
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{
 
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        /* Values for x86 and x86_64.*/
 
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        int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64};
 
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        int i;
 
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        for (i = 0; i < ARRAY_SIZE(val); i++) {
 
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                user_desc_t info;
 
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                info.entry_number = val[i];
 
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                if (syscall(__NR_get_thread_area, &info) == 0) {
 
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                        *tls_min = val[i];
 
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                        *supports_tls = 1;
 
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                        return;
 
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                } else {
 
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                        if (errno == EINVAL)
 
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                                continue;
 
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                        else if (errno == ENOSYS)
 
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                                *supports_tls = 0;
 
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                                return;
 
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                }
 
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        }
 
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        *supports_tls = 0;
 
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}
 
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int os_set_thread_area(user_desc_t *info, int pid)
 
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{
 
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        int ret;
 
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        ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
 
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                     (unsigned long) info);
 
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        if (ret < 0)
 
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                ret = -errno;
 
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        return ret;
 
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}
 
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int os_get_thread_area(user_desc_t *info, int pid)
 
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{
 
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        int ret;
 
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        ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
 
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                     (unsigned long) info);
 
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        if (ret < 0)
 
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                ret = -errno;
 
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        return ret;
 
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}