aboutsummaryrefslogtreecommitdiff
path: root/linuxthreads/sysdeps/s390/tls.h
diff options
context:
space:
mode:
Diffstat (limited to 'linuxthreads/sysdeps/s390/tls.h')
-rw-r--r--linuxthreads/sysdeps/s390/tls.h87
1 files changed, 82 insertions, 5 deletions
diff --git a/linuxthreads/sysdeps/s390/tls.h b/linuxthreads/sysdeps/s390/tls.h
index d872bb7553..11f31ba88a 100644
--- a/linuxthreads/sysdeps/s390/tls.h
+++ b/linuxthreads/sysdeps/s390/tls.h
@@ -45,19 +45,96 @@ typedef struct
# include <tcb-offsets.h>
#endif /* __ASSEMBLER__ */
-#undef USE_TLS
+/* TLS is always supported if the tools support it. There are no
+ kernel dependencies. To avoid bothering with the TLS support code
+ at all, use configure --without-tls.
-#if USE_TLS
+ We need USE_TLS to be consistently defined, for ldsodefs.h
+ conditionals. */
-#else
+#ifdef HAVE_TLS_SUPPORT
-#define NONTLS_INIT_TP \
+/* Signal that TLS support is available. */
+# define USE_TLS 1
+
+# ifndef __ASSEMBLER__
+/* Get system call information. */
+# include <sysdep.h>
+
+
+/* Get the thread descriptor definition. */
+# include <linuxthreads/descr.h>
+
+/* This is the size of the initial TCB. */
+# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
+
+/* Alignment requirements for the initial TCB. */
+# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
+
+/* This is the size of the TCB. */
+# define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct)
+
+/* Alignment requirements for the TCB. */
+# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
+
+/* The TCB can have any size and the memory following the address the
+ thread pointer points to is unspecified. Allocate the TCB there. */
+# define TLS_TCB_AT_TP 1
+
+
+/* Install the dtv pointer. The pointer passed is to the element with
+ index -1 which contain the length. */
+# define INSTALL_DTV(descr, dtvp) \
+ ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
+
+/* Install new dtv for current thread. */
+# define INSTALL_NEW_DTV(dtv) \
+ (((tcbhead_t *) __builtin_thread_pointer ())->dtv = (dtv))
+
+/* Return dtv of given thread descriptor. */
+# define GET_DTV(descr) \
+ (((tcbhead_t *) (descr))->dtv)
+
+/* Code to initially initialize the thread pointer. This might need
+ special attention since 'errno' is not yet available and if the
+ operation can cause a failure 'errno' must not be touched.
+
+ The value of this macro is null if successful, or an error string. */
+# define TLS_INIT_TP(descr, secondcall) \
+ ({ \
+ void *_descr = (descr); \
+ tcbhead_t *head = _descr; \
+ \
+ head->tcb = _descr; \
+ /* For now the thread descriptor is at the same address. */ \
+ head->self = _descr; \
+ \
+ __builtin_set_thread_pointer (_descr); \
+ 0; \
+ })
+
+/* Return the address of the dtv for the current thread. */
+# define THREAD_DTV() \
+ (((tcbhead_t *) __builtin_thread_pointer ())->dtv)
+
+# endif /* __ASSEMBLER__ */
+
+#else /* HAVE_TLS_SUPPORT && (FLOATING_STACKS || !IS_IN_libpthread) */
+
+# ifndef __ASSEMBLER__
+
+/* Get the thread descriptor definition. */
+# include <linuxthreads/descr.h>
+
+# define NONTLS_INIT_TP \
do { \
static const tcbhead_t nontls_init_tp \
= { .multiple_threads = 0 }; \
INIT_THREAD_SELF (&nontls_init_tp, 0); \
} while (0)
-#endif /* USE_TLS */
+# endif /* __ASSEMBLER__ */
+
+#endif /* HAVE_TLS_SUPPORT && (FLOATING_STACKS || !IS_IN_libpthread) */
#endif /* tls.h */