x86: x86 core dump TLS

This makes ELF core dumps of 32-bit processes include a new
note type NT_386_TLS (0x200) giving the contents of the TLS
slots in struct user_desc format.  This lets post mortem
examination figure out what the segment registers mean like
the debugger does with get_thread_area on a live process.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index f8b89059e6ed..e6a680c7daf7 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -1313,6 +1313,7 @@ static const struct user_regset x86_32_regsets[] = {
                 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
         },
         [REGSET_TLS] = {
+                .core_note_type = NT_386_TLS,
                 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
                 .size = sizeof(struct user_desc),
                 .align = sizeof(struct user_desc),