libpthread/nptl: core of the "Native Posix Threading Library" for uClibc

targetting arm,sh,i386,mips,sparc for now

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

1 files changed, 334 insertions, 0 deletions

diff --git a/libpthread/nptl/sysdeps/x86_64/tls.h b/libpthread/nptl/sysdeps/x86_64/tls.h
new file mode 100644
index 000000000..516827b8e
--- /dev/null
+++ b/libpthread/nptl/sysdeps/x86_64/tls.h
@@ -0,0 +1,334 @@
+/* Definition for thread-local data handling.  nptl/x86_64 version.
+   Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _TLS_H
+#define _TLS_H	1
+
+#include <asm/prctl.h>	/* For ARCH_SET_FS.  */
+#ifndef __ASSEMBLER__
+# include <stdbool.h>
+# include <stddef.h>
+# include <stdint.h>
+# include <stdlib.h>
+
+
+/* Type for the dtv.  */
+typedef union dtv
+{
+  size_t counter;
+  struct
+  {
+    void *val;
+    bool is_static;
+  } pointer;
+} dtv_t;
+
+
+typedef struct
+{
+  void *tcb;		/* Pointer to the TCB.  Not necessary the
+			   thread descriptor used by libpthread.  */
+  dtv_t *dtv;
+  void *self;		/* Pointer to the thread descriptor.  */
+  int multiple_threads;
+  uintptr_t sysinfo;
+  uintptr_t stack_guard;
+} tcbhead_t;
+
+#else /* __ASSEMBLER__ */
+# include <tcb-offsets.h>
+#endif
+
+
+/* We require TLS support in the tools.  */
+#ifndef HAVE_TLS_SUPPORT
+# error "TLS support is required."
+#endif
+
+/* Signal that TLS support is available.  */
+#define USE_TLS	1
+
+/* Alignment requirement for the stack.  */
+#define STACK_ALIGN	16
+
+
+#ifndef __ASSEMBLER__
+/* Get system call information.  */
+# include <sysdep.h>
+
+
+/* Get the thread descriptor definition.  */
+# include <nptl/descr.h>
+
+#ifndef LOCK_PREFIX
+# ifdef UP
+#  define LOCK_PREFIX	/* nothing */
+# else
+#  define LOCK_PREFIX	"lock;"
+# endif
+#endif
+
+/* This is the size of the initial TCB.  Can't be just sizeof (tcbhead_t),
+   because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
+   struct pthread even when not linked with -lpthread.  */
+# define TLS_INIT_TCB_SIZE sizeof (struct pthread)
+
+/* Alignment requirements for the initial TCB.  */
+# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
+
+/* This is the size of the TCB.  */
+# define TLS_TCB_SIZE sizeof (struct pthread)
+
+/* Alignment requirements for the TCB.  */
+# define TLS_TCB_ALIGN __alignof__ (struct pthread)
+
+/* 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(dtvp) \
+  ({ struct pthread *__pd;						      \
+     THREAD_SETMEM (__pd, header.dtv, (dtvp)); })
+
+/* Return dtv of given thread descriptor.  */
+# define GET_DTV(descr) \
+  (((tcbhead_t *) (descr))->dtv)
+
+
+/* Macros to load from and store into segment registers.  */
+# define TLS_GET_FS() \
+  ({ int __seg; __asm ("movl %%fs, %0" : "=q" (__seg)); __seg; })
+# define TLS_SET_FS(val) \
+  __asm ("movl %0, %%fs" :: "q" (val))
+
+
+/* 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.
+
+   We have to make the syscall for both uses of the macro since the
+   address might be (and probably is) different.  */
+# define TLS_INIT_TP(thrdescr, secondcall) \
+  ({ void *_thrdescr = (thrdescr);					      \
+     tcbhead_t *_head = _thrdescr;					      \
+     int _result;							      \
+									      \
+     _head->tcb = _thrdescr;						      \
+     /* For now the thread descriptor is at the same address.  */	      \
+     _head->self = _thrdescr;						      \
+									      \
+     /* It is a simple syscall to set the %fs value for the thread.  */	      \
+     asm volatile ("syscall"						      \
+		   : "=a" (_result)					      \
+		   : "0" ((unsigned long int) __NR_arch_prctl),		      \
+		     "D" ((unsigned long int) ARCH_SET_FS),		      \
+		     "S" (_thrdescr)					      \
+		   : "memory", "cc", "r11", "cx");			      \
+									      \
+    _result ? "cannot set %fs base address for thread-local storage" : 0;     \
+  })
+
+
+/* Return the address of the dtv for the current thread.  */
+# define THREAD_DTV() \
+  ({ struct pthread *__pd;						      \
+     THREAD_GETMEM (__pd, header.dtv); })
+
+
+/* Return the thread descriptor for the current thread.
+
+   The contained asm must *not* be marked volatile since otherwise
+   assignments like
+        pthread_descr self = thread_self();
+   do not get optimized away.  */
+# define THREAD_SELF \
+  ({ struct pthread *__self;						      \
+     asm ("movq %%fs:%c1,%q0" : "=r" (__self)				      \
+	  : "i" (offsetof (struct pthread, header.self)));	 	      \
+     __self;})
+
+/* Magic for libthread_db to know how to do THREAD_SELF.  */
+# define DB_THREAD_SELF_INCLUDE  <sys/reg.h> /* For the FS constant.  */
+# define DB_THREAD_SELF CONST_THREAD_AREA (64, FS)
+
+/* Read member of the thread descriptor directly.  */
+# define THREAD_GETMEM(descr, member) \
+  ({ __typeof (descr->member) __value;					      \
+     if (sizeof (__value) == 1)						      \
+       asm volatile ("movb %%fs:%P2,%b0"				      \
+		     : "=q" (__value)					      \
+		     : "0" (0), "i" (offsetof (struct pthread, member)));     \
+     else if (sizeof (__value) == 4)					      \
+       asm volatile ("movl %%fs:%P1,%0"					      \
+		     : "=r" (__value)					      \
+		     : "i" (offsetof (struct pthread, member)));	      \
+     else								      \
+       {								      \
+	 if (sizeof (__value) != 8)					      \
+	   /* There should not be any value with a size other than 1,	      \
+	      4 or 8.  */						      \
+	   abort ();							      \
+									      \
+	 asm volatile ("movq %%fs:%P1,%q0"				      \
+		       : "=r" (__value)					      \
+		       : "i" (offsetof (struct pthread, member)));	      \
+       }								      \
+     __value; })
+
+
+/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
+# define THREAD_GETMEM_NC(descr, member, idx) \
+  ({ __typeof (descr->member[0]) __value;				      \
+     if (sizeof (__value) == 1)						      \
+       asm volatile ("movb %%fs:%P2(%q3),%b0"				      \
+		     : "=q" (__value)					      \
+		     : "0" (0), "i" (offsetof (struct pthread, member[0])),   \
+		       "r" (idx));					      \
+     else if (sizeof (__value) == 4)					      \
+       asm volatile ("movl %%fs:%P1(,%q2,4),%0"				      \
+		     : "=r" (__value)					      \
+		     : "i" (offsetof (struct pthread, member[0])), "r" (idx));\
+     else								      \
+       {								      \
+	 if (sizeof (__value) != 8)					      \
+	   /* There should not be any value with a size other than 1,	      \
+	      4 or 8.  */						      \
+	   abort ();							      \
+									      \
+	 asm volatile ("movq %%fs:%P1(,%q2,8),%q0"			      \
+		       : "=r" (__value)					      \
+		       : "i" (offsetof (struct pthread, member[0])),	      \
+			 "r" (idx));					      \
+       }								      \
+     __value; })
+
+
+/* Loading addresses of objects on x86-64 needs to be treated special
+   when generating PIC code.  */
+#ifdef __pic__
+# define IMM_MODE "nr"
+#else
+# define IMM_MODE "ir"
+#endif
+
+
+/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
+# define THREAD_SETMEM(descr, member, value) \
+  ({ if (sizeof (descr->member) == 1)					      \
+       asm volatile ("movb %b0,%%fs:%P1" :				      \
+		     : "iq" (value),					      \
+		       "i" (offsetof (struct pthread, member)));	      \
+     else if (sizeof (descr->member) == 4)				      \
+       asm volatile ("movl %0,%%fs:%P1" :				      \
+		     : IMM_MODE (value),				      \
+		       "i" (offsetof (struct pthread, member)));	      \
+     else								      \
+       {								      \
+	 if (sizeof (descr->member) != 8)				      \
+	   /* There should not be any value with a size other than 1,	      \
+	      4 or 8.  */						      \
+	   abort ();							      \
+									      \
+	 asm volatile ("movq %q0,%%fs:%P1" :				      \
+		       : IMM_MODE ((unsigned long int) value),		      \
+			 "i" (offsetof (struct pthread, member)));	      \
+       }})
+
+
+/* Set member of the thread descriptor directly.  */
+# define THREAD_SETMEM_NC(descr, member, idx, value) \
+  ({ if (sizeof (descr->member[0]) == 1)				      \
+       asm volatile ("movb %b0,%%fs:%P1(%q2)" :				      \
+		     : "iq" (value),					      \
+		       "i" (offsetof (struct pthread, member[0])),	      \
+		       "r" (idx));					      \
+     else if (sizeof (descr->member[0]) == 4)				      \
+       asm volatile ("movl %0,%%fs:%P1(,%q2,4)" :			      \
+		     : IMM_MODE (value),				      \
+		       "i" (offsetof (struct pthread, member[0])),	      \
+		       "r" (idx));					      \
+     else								      \
+       {								      \
+	 if (sizeof (descr->member[0]) != 8)				      \
+	   /* There should not be any value with a size other than 1,	      \
+	      4 or 8.  */						      \
+	   abort ();							      \
+									      \
+	 asm volatile ("movq %q0,%%fs:%P1(,%q2,8)" :			      \
+		       : IMM_MODE ((unsigned long int) value),		      \
+			 "i" (offsetof (struct pthread, member[0])),	      \
+			 "r" (idx));					      \
+       }})
+
+
+/* Atomic compare and exchange on TLS, returning old value.  */
+#define THREAD_ATOMIC_CMPXCHG_VAL(descr, member, newval, oldval) \
+  ({ __typeof (descr->member) __ret;					      \
+     __typeof (oldval) __old = (oldval);				      \
+     if (sizeof (descr->member) == 4)					      \
+       asm volatile (LOCK_PREFIX "cmpxchgl %2, %%fs:%P3"		      \
+		     : "=a" (__ret)					      \
+		     : "0" (__old), "r" (newval),			      \
+		       "i" (offsetof (struct pthread, member)));	      \
+     else								      \
+       /* Not necessary for other sizes in the moment.  */		      \
+       abort ();							      \
+     __ret; })
+
+
+/* Atomic set bit.  */
+#define THREAD_ATOMIC_BIT_SET(descr, member, bit) \
+  (void) ({ if (sizeof ((descr)->member) == 4)				      \
+	      asm volatile (LOCK_PREFIX "orl %1, %%fs:%P0"		      \
+			    :: "i" (offsetof (struct pthread, member)),	      \
+			       "ir" (1 << (bit)));			      \
+	    else							      \
+	      /* Not necessary for other sizes in the moment.  */	      \
+	      abort (); })
+
+
+#define CALL_THREAD_FCT(descr) \
+  ({ void *__res;							      \
+     asm volatile ("movq %%fs:%P2, %%rdi\n\t"				      \
+		   "callq *%%fs:%P1"					      \
+		   : "=a" (__res)					      \
+		   : "i" (offsetof (struct pthread, start_routine)),	      \
+		     "i" (offsetof (struct pthread, arg))		      \
+		   : "di", "si", "cx", "dx", "r8", "r9", "r10", "r11",	      \
+		     "memory", "cc");					      \
+     __res; })
+
+
+/* Set the stack guard field in TCB head.  */
+# define THREAD_SET_STACK_GUARD(value) \
+    THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
+# define THREAD_COPY_STACK_GUARD(descr) \
+    ((descr)->header.stack_guard					      \
+     = THREAD_GETMEM (THREAD_SELF, header.stack_guard))
+
+#endif /* __ASSEMBLER__ */
+
+#endif	/* tls.h */