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

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* sysdeps/powerpc/tls.h [HAVE_TLS_SUPPORT]: Define USE_TLS and all
	related macros.
This commit is contained in:
Roland McGrath 2003-02-27 20:47:12 +00:00
parent a2d83cfb21
commit f4038ed763
1 changed files with 89 additions and 4 deletions
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93
linuxthreads/sysdeps/powerpc/tls.h
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@ -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 */