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author | Tony Lindgren <tony@atomide.com> | 2011-11-07 21:27:23 +0100 |
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committer | Tony Lindgren <tony@atomide.com> | 2011-11-07 21:27:23 +0100 |
commit | d30cc16c8e48368e0518f4975a78711e53e14a0f (patch) | |
tree | 26b57f7ab5a963cc3d6c57dff6951bd930875583 /arch/x86/um/os-Linux/tls.c | |
parent | ARM: OMAP2: Fix H4 matrix keyboard warning (diff) | |
parent | ARM: OMAP: Fix export.h or module.h includes (diff) | |
download | linux-d30cc16c8e48368e0518f4975a78711e53e14a0f.tar.xz linux-d30cc16c8e48368e0518f4975a78711e53e14a0f.zip |
Merge branch 'fixes-modulesplit' into fixes
Diffstat (limited to 'arch/x86/um/os-Linux/tls.c')
-rw-r--r-- | arch/x86/um/os-Linux/tls.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/x86/um/os-Linux/tls.c b/arch/x86/um/os-Linux/tls.c new file mode 100644 index 000000000000..82276b6071af --- /dev/null +++ b/arch/x86/um/os-Linux/tls.c @@ -0,0 +1,67 @@ +#include <errno.h> +#include <linux/unistd.h> + +#include <sys/ptrace.h> +#include <sys/syscall.h> +#include <unistd.h> + +#include "sysdep/tls.h" + +#ifndef PTRACE_GET_THREAD_AREA +#define PTRACE_GET_THREAD_AREA 25 +#endif + +#ifndef PTRACE_SET_THREAD_AREA +#define PTRACE_SET_THREAD_AREA 26 +#endif + +/* Checks whether host supports TLS, and sets *tls_min according to the value + * valid on the host. + * i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */ +void check_host_supports_tls(int *supports_tls, int *tls_min) +{ + /* Values for x86 and x86_64.*/ + int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64}; + int i; + + for (i = 0; i < ARRAY_SIZE(val); i++) { + user_desc_t info; + info.entry_number = val[i]; + + if (syscall(__NR_get_thread_area, &info) == 0) { + *tls_min = val[i]; + *supports_tls = 1; + return; + } else { + if (errno == EINVAL) + continue; + else if (errno == ENOSYS) + *supports_tls = 0; + return; + } + } + + *supports_tls = 0; +} + +int os_set_thread_area(user_desc_t *info, int pid) +{ + int ret; + + ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number, + (unsigned long) info); + if (ret < 0) + ret = -errno; + return ret; +} + +int os_get_thread_area(user_desc_t *info, int pid) +{ + int ret; + + ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number, + (unsigned long) info); + if (ret < 0) + ret = -errno; + return ret; +} |