diff options
Diffstat (limited to 'arch/x86/um')
| -rw-r--r-- | arch/x86/um/os-Linux/tls.c | 34 | ||||
| -rw-r--r-- | arch/x86/um/shared/sysdep/tls.h | 3 |
2 files changed, 36 insertions, 1 deletions
diff --git a/arch/x86/um/os-Linux/tls.c b/arch/x86/um/os-Linux/tls.c index 281e83ecce3d..82276b6071af 100644 --- a/arch/x86/um/os-Linux/tls.c +++ b/arch/x86/um/os-Linux/tls.c @@ -1,15 +1,25 @@ #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) { +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; @@ -33,3 +43,25 @@ void check_host_supports_tls(int *supports_tls, int *tls_min) { *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; +} diff --git a/arch/x86/um/shared/sysdep/tls.h b/arch/x86/um/shared/sysdep/tls.h index db2ae9c12e23..f2f30bd67b9b 100644 --- a/arch/x86/um/shared/sysdep/tls.h +++ b/arch/x86/um/shared/sysdep/tls.h @@ -29,6 +29,9 @@ typedef struct user_desc user_desc_t; # endif /* __KERNEL__ */ +extern int os_set_thread_area(user_desc_t *info, int pid); +extern int os_get_thread_area(user_desc_t *info, int pid); + #ifdef __i386__ #define GDT_ENTRY_TLS_MIN_I386 6 #define GDT_ENTRY_TLS_MIN_X86_64 12 |