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Prepare for future ld.so/libc bump: update <tib.h> with the definitions

that will be needed and make libpthread work when ld.so/libc.a provide an
initial TIB.
OPENBSD_6_0
guenther 8 years ago
parent
commit
1e05f2de39
1 changed files with 36 additions and 39 deletions
  1. +36
    -39
      src/include/tib.h

+ 36
- 39
src/include/tib.h View File

@ -1,4 +1,4 @@
/* $OpenBSD: tib.h,v 1.1 2015/09/14 08:16:14 guenther Exp $ */
/* $OpenBSD: tib.h,v 1.2 2016/03/20 02:30:28 guenther Exp $ */
/*
* Copyright (c) 2011,2014 Philip Guenther <guenther@openbsd.org>
*
@ -50,9 +50,6 @@
* Initializes a TIB for a new thread, using the supplied
* value for the dtv pointer
*
* TIB_COPY(tib, oldtib)
* Copies oldtib to tib, (re)initializing the internal members
*
* TIB_TO_THREAD(tib)
* Given a TIB pointer, return a pointer to the struct pthread
*
@ -94,11 +91,15 @@
/* If <machine/tcb.h> doesn't provide a better way, then use the default */
#ifndef TCB_GET
#define TCB_GET() __get_tcb()
#ifdef TCB_GET
# define TCB_HAVE_MD_GET 1
#else
# define TCB_GET() __get_tcb()
#endif
#ifndef TCB_SET
#define TCB_SET(tcb) __set_tcb(tcb)
#ifdef TCB_SET
# define TCB_HAVE_MD_SET 1
#else
# define TCB_SET(tcb) __set_tcb(tcb)
#endif
@ -111,28 +112,34 @@
* our thread bits before the TCB, at negative offsets from the
* TCB pointer. Ergo, memory is laid out, low to high, as:
*
* pthread structure
* [pthread structure]
* TIB {
* int cancel_flags
* int cancel_requested
* int errno
* void *locale
* TCB {
* void *dtv
* void *locale
* struct pthread *thread
* }
* }
* static TLS data
*/
struct tib {
int __tib_padding /* padding for 8byte alignment */
#ifdef __LP64__
int __tib_padding; /* padding for 8byte alignment */
#endif
int tib_cancel_flags;
int tib_cancel;
int tib_errno;
void *tib_dtv; /* internal to the runtime linker */
void *tib_locale;
void *tib_dtv; /* internal to the runtime linker */
void *tib_thread;
};
#define _TIB_PREP(tib) ((void)((tib)->__tib_padding = 0))
#ifdef __LP64__
# define _TIB_PREP(tib) ((void)((tib)->__tib_padding = 0))
#endif
#define _TIBO_PTHREAD (- _ALIGN(sizeof(struct pthread)))
@ -149,38 +156,38 @@ struct tib {
* self pointer [i386/amd64 only]
* void *dtv
* }
* struct pthread *thread
* void *locale
* int errno
* int cancel_count_flags
* int cancel_requested
* }
* pthread structure
* [pthread structure]
*/
struct tib {
#if defined(__i386) || defined(__amd64)
struct tib *__tib_self;
#define __tib_tcb __tib_self
# define __tib_tcb __tib_self
#endif
void *tib_dtv; /* internal to the runtime linker */
void *tib_thread;
void *tib_locale;
int tib_errno;
int tib_cancel; /* set to request cancelation */
int tib_cancel_flags;
#if !defined(__i386)
#if defined(__LP64__) || defined(__i386)
int __tib_padding; /* padding for 8byte alignment */
#endif
};
#define _TIBO_PTHREAD _ALIGN(sizeof(struct tib))
#if defined(__i386)
#define _TIB_PREP(tib) ((void)((tib)->__tib_self = (tib)))
#elif defined(__amd64)
#define _TIB_PREP(tib) \
#if defined(__i386) || defined(__amd64)
# define _TIB_PREP(tib) \
((void)((tib)->__tib_self = (tib), (tib)->__tib_padding = 0))
#else
#define _TIB_PREP(tib) ((void)((tib)->__tib_padding = 0))
#elif defined(__LP64__)
# define _TIB_PREP(tib) ((void)((tib)->__tib_padding = 0))
#endif
#define TIB_EXTRA_ALIGN sizeof(void *)
@ -191,10 +198,11 @@ struct tib {
/* nothing to do by default */
#ifndef _TIB_PREP
#define _TIB_PREP(tib) ((void)0)
# define _TIB_PREP(tib) ((void)0)
#endif
#define TIB_INIT(tib, dtv) do { \
#define TIB_INIT(tib, dtv, thread) do { \
(tib)->tib_thread = (thread); \
(tib)->tib_locale = NULL; \
(tib)->tib_cancel_flags = 0; \
(tib)->tib_cancel = 0; \
@ -202,37 +210,26 @@ struct tib {
(tib)->tib_errno = 0; \
_TIB_PREP(tib); \
} while (0)
#define TIB_COPY(tib, oldtib) do { \
*(tib) = *(oldtib); \
_TIB_PREP(tib); \
} while (0)
#ifndef __tib_tcb
#define __tib_tcb tib_dtv
# define __tib_tcb tib_dtv
#endif
#define _TIBO_TCB offsetof(struct tib, __tib_tcb)
#define TCB_TO_TIB(tcb) ((struct tib *)((char *)(tcb) - _TIBO_TCB))
#define TIB_TO_TCB(tib) ((char *)(tib) + _TIBO_TCB)
#define TIB_TO_THREAD(tib) ((struct pthread *)((char *)(tib) + \
_TIBO_PTHREAD))
#define THREAD_TO_TIB(thread) ((struct tib *)((char *)(thread) - \
_TIBO_PTHREAD))
#define TIB_TO_THREAD(tib) ((struct pthread *)(tib)->tib_thread)
#define TIB_GET() TCB_TO_TIB(TCB_GET())
#define TIB_THREAD() TIB_TO_THREAD(TIB_GET())
#define TCB_THREAD() TIB_TO_THREAD(TIB_GET())
__BEGIN_DECLS
void *_dl_allocate_tib(size_t _extra, int _flags) __dso_public;
#define DAT_UPDATE_CURRENT 1
void *_dl_allocate_tib(size_t _extra) __dso_public;
void _dl_free_tib(void *_tib, size_t _extra) __dso_public;
/* The actual syscalls */
void *__get_tcb(void);
void __set_tcb(void *_tcb);
/* The function in libc called by crt0 to init the tcb in static processes */
void __init_tcb(char **_envp) __dso_hidden;
__END_DECLS
#endif /* _TIB_H_ */

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