From ebff9c5cfae62e84dbd0456d564bd882818dc15f Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Sat, 14 Jul 2018 05:53:05 -0700 Subject: x86: Rename __glibc_reserved1 to feature_1 in tcbhead_t [BZ #22563] feature_1 has X86_FEATURE_1_IBT and X86_FEATURE_1_SHSTK bits for CET run-time control. CET_ENABLED, IBT_ENABLED and SHSTK_ENABLED are defined to 1 or 0 to indicate that if CET, IBT and SHSTK are enabled. is added to set up thread-local data. Reviewed-by: Carlos O'Donell [BZ #22563] * nptl/pthread_create.c: Include . (__pthread_create_2_1): Call tls_setup_tcbhead. * sysdeps/generic/tls-setup.h: New file. * sysdeps/x86/nptl/tls-setup.h: Likewise. * sysdeps/i386/nptl/tcb-offsets.sym (FEATURE_1_OFFSET): New. * sysdeps/x86_64/nptl/tcb-offsets.sym (FEATURE_1_OFFSET): Likewise. * sysdeps/i386/nptl/tls.h (tcbhead_t): Rename __glibc_reserved1 to feature_1. * sysdeps/x86_64/nptl/tls.h (tcbhead_t): Likewise. * sysdeps/x86/sysdep.h (X86_FEATURE_1_IBT): New. (X86_FEATURE_1_SHSTK): Likewise. (CET_ENABLED): Likewise. (IBT_ENABLED): Likewise. (SHSTK_ENABLED): Likewise. --- sysdeps/i386/nptl/tcb-offsets.sym | 1 + sysdeps/i386/nptl/tls.h | 5 ++++- 2 files changed, 5 insertions(+), 1 deletion(-) (limited to 'sysdeps/i386') diff --git a/sysdeps/i386/nptl/tcb-offsets.sym b/sysdeps/i386/nptl/tcb-offsets.sym index 7d7fe5e71c..fbac241c45 100644 --- a/sysdeps/i386/nptl/tcb-offsets.sym +++ b/sysdeps/i386/nptl/tcb-offsets.sym @@ -12,3 +12,4 @@ CLEANUP offsetof (struct pthread, cleanup) CLEANUP_PREV offsetof (struct _pthread_cleanup_buffer, __prev) MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock) POINTER_GUARD offsetof (tcbhead_t, pointer_guard) +FEATURE_1_OFFSET offsetof (tcbhead_t, feature_1) diff --git a/sysdeps/i386/nptl/tls.h b/sysdeps/i386/nptl/tls.h index afb71ce431..21e23cd809 100644 --- a/sysdeps/i386/nptl/tls.h +++ b/sysdeps/i386/nptl/tls.h @@ -41,7 +41,10 @@ typedef struct uintptr_t stack_guard; uintptr_t pointer_guard; int gscope_flag; - int __glibc_reserved1; + /* Bit 0: X86_FEATURE_1_IBT. + Bit 1: X86_FEATURE_1_SHSTK. + */ + unsigned int feature_1; /* Reservation of some values for the TM ABI. */ void *__private_tm[3]; /* GCC split stack support. */ -- cgit 1.4.1