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authorRoland McGrath <roland@gnu.org>2003-02-27 20:47:12 +0000
committerRoland McGrath <roland@gnu.org>2003-02-27 20:47:12 +0000
commitf4038ed763e48e3530a330513eeba9ff5ff78156 (patch)
tree6ee7a0c7a47417943ce01ef69e220e2900c95aaf /linuxthreads/sysdeps/powerpc/tls.h
parenta2d83cfb21ddeef7dda1656521438db6f352330c (diff)
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2003-02-27 Roland McGrath <roland@redhat.com>
* sysdeps/powerpc/tls.h [HAVE_TLS_SUPPORT]: Define USE_TLS and all related macros.
Diffstat (limited to 'linuxthreads/sysdeps/powerpc/tls.h')
-rw-r--r--linuxthreads/sysdeps/powerpc/tls.h93
1 files changed, 89 insertions, 4 deletions
diff --git a/linuxthreads/sysdeps/powerpc/tls.h b/linuxthreads/sysdeps/powerpc/tls.h
index 5b234d9882..1c34a3b7b5 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 */