2003-02-27 Roland McGrath <roland@redhat.com>

	* sysdeps/powerpc/tls.h [HAVE_TLS_SUPPORT]: Define USE_TLS and all
	related macros.

1 files changed, 89 insertions, 4 deletions

diff --git a/linuxthreads/sysdeps/powerpc/tls.h b/linuxthreads/sysdeps/powerpc/tls.h
index 5b234d98..1c34a3b 100644
--- a/linuxthreads/sysdeps/powerpc/tls.h
+++ b/linuxthreads/sysdeps/powerpc/tls.h
@@ -45,11 +45,96 @@ typedef struct
 # include <tcb-offsets.h>
 #endif /* __ASSEMBLER__ */
 
-#undef USE_TLS
+#ifdef HAVE_TLS_SUPPORT
 
-#if USE_TLS
+/* Signal that TLS support is available.  */
+# define USE_TLS	1
 
-#else
+# ifndef __ASSEMBLER__
+
+/* 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 (tcbhead_t)
+
+/* Alignment requirements for the TCB.  */
+#  define TLS_TCB_ALIGN		__alignof__ (tcbhead_t)
+
+/* This is the size we need before TCB.  */
+#  define TLS_PRE_TCB_SIZE	sizeof (struct _pthread_descr_struct)
+
+/* The following assumes that TP (R13) is points to the end of the
+   TCB + 0x7000 (per the ABI).  This implies that TCB address is
+   R13-(TLS_TCB_SIZE + 0x7000).  As we define TLS_DTV_AT_TP we can
+   assume that the pthread_descr is allocated immediately ahead of the
+   TCB.  This implies that the pthread_descr address is
+   R13-(TLS_PRE_TCB_SIZE + TLS_TCB_SIZE + 0x7000).  */
+#  define TLS_TCB_OFFSET	0x7000
+
+/* The DTV is allocated at the TP; the TCB is placed elsewhere.  */
+/* This is not really true for powerpc64.  We are following alpha
+   where the DTV pointer is first doubleword in the TCB.  */
+#  define TLS_DTV_AT_TP 1
+
+/* Install the dtv pointer.  The pointer passed is to the element with
+   index -1 which contain the length.  */
+#  define INSTALL_DTV(TCBP, DTVP) \
+  (((tcbhead_t *) (TCBP))->dtv = (DTVP) + 1)
+
+/* Install new dtv for current thread.  */
+#  define INSTALL_NEW_DTV(DTV) (THREAD_DTV() = (DTV))
+
+/* Return dtv of given thread descriptor.  */
+#  define GET_DTV(TCBP)	(((tcbhead_t *) (TCBP))->dtv)
+
+/* The global register variable is declared in pt-machine.h with
+   the wrong type, but the compiler doesn't like us declaring another.  */
+#  define __thread_register ((void *) __thread_self)
+
+/* 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.  */
+# define TLS_INIT_TP(TCBP, SECONDCALL) \
+    (__thread_register = (void *) (TCBP) + TLS_TCB_OFFSET + TLS_TCB_SIZE, 0)
+
+/* Return the address of the dtv for the current thread.  */
+#  define THREAD_DTV() \
+     (((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET - TLS_TCB_SIZE))->dtv)
+
+/* Return the thread descriptor for the current thread.  */
+#  undef THREAD_SELF
+#  define THREAD_SELF \
+    ((pthread_descr) (__thread_register \
+		      - TLS_TCB_OFFSET - TLS_TCB_SIZE - TLS_PRE_TCB_SIZE))
+
+#  undef INIT_THREAD_SELF
+#  define INIT_THREAD_SELF(DESCR, NR) \
+     (__thread_register = ((void *) (DESCR) \
+		           + TLS_TCB_OFFSET + TLS_TCB_SIZE + TLS_PRE_TCB_SIZE))
+
+/* Get the thread descriptor definition.  */
+#  include <linuxthreads/descr.h>
+
+/* Generic bits of LinuxThreads may call these macros with
+   DESCR set to NULL.  We are expected to be able to reference
+   the "current" value.  */
+
+#  define THREAD_GETMEM(descr, member) \
+     ((void) sizeof (descr), THREAD_SELF->member)
+#  define THREAD_SETMEM(descr, member, value) \
+     ((void) sizeof (descr), THREAD_SELF->member = (value))
+
+#define THREAD_GETMEM_NC(descr, member) THREAD_GETMEM (descr, member)
+#define THREAD_SETMEM_NC(descr, member, value) \
+  THREAD_SETMEM ((descr), member, (value))
+
+# endif /* __ASSEMBLER__ */
+
+#else /* Not HAVE_TLS_SUPPORT.  */
 
 #define NONTLS_INIT_TP							\
   do {									\
@@ -58,6 +143,6 @@ typedef struct
     __thread_self = (__typeof (__thread_self)) &nontls_init_tp;		\
   } while (0)
 
-#endif /* USE_TLS */
+#endif /* HAVE_TLS_SUPPORT */
 
 #endif	/* tls.h */