Merge in the pthread library. This is the linuxthreads library taken from

glibc 2.1.3 and ported to work with uClibc by Stefan Soucek and Erik Andersen
(me).  Stefan has hacked things up such that linuxthreads runs on MMU-less
systems (tested only on arm-nommu).  Erik cleaned things up and made it work
properly as a shared library.
 -Erik

4 files changed, 360 insertions, 0 deletions

diff --git a/libpthread/linuxthreads/sysdeps/i386/i686/pt-machine.h b/libpthread/linuxthreads/sysdeps/i386/i686/pt-machine.h
new file mode 100644
index 000000000..8d9ea709b
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/i386/i686/pt-machine.h
@@ -0,0 +1,67 @@
+/* Machine-dependent pthreads configuration and inline functions.
+   i686 version.
+   Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Richard Henderson <rth@tamu.edu>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef PT_EI
+# define PT_EI extern inline
+#endif
+
+
+/* Get some notion of the current stack.  Need not be exactly the top
+   of the stack, just something somewhere in the current frame.  */
+#define CURRENT_STACK_FRAME  stack_pointer
+register char * stack_pointer __asm__ ("%esp");
+
+
+/* Spinlock implementation; required.  */
+PT_EI int
+testandset (int *spinlock)
+{
+  int ret;
+
+  __asm__ __volatile__ (
+	"xchgl %0, %1"
+	: "=r"(ret), "=m"(*spinlock)
+	: "0"(1), "m"(*spinlock)
+	: "memory");
+
+  return ret;
+}
+
+
+/* Compare-and-swap for semaphores.  It's always available on i686.  */
+#define HAS_COMPARE_AND_SWAP
+
+PT_EI int
+__compare_and_swap (long int *p, long int oldval, long int newval)
+{
+  char ret;
+  long int readval;
+
+  __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
+			: "=q" (ret), "=m" (*p), "=a" (readval)
+			: "r" (newval), "m" (*p), "a" (oldval)
+			: "memory");
+  return ret;
+}
+
+
+/* Use the LDT implementation only if the kernel is fixed.  */
+//#include "../useldt.h"
diff --git a/libpthread/linuxthreads/sysdeps/i386/pt-machine.h b/libpthread/linuxthreads/sysdeps/i386/pt-machine.h
new file mode 100644
index 000000000..f542bb2d2
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/i386/pt-machine.h
@@ -0,0 +1,99 @@
+/* Machine-dependent pthreads configuration and inline functions.
+   i386 version.
+   Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Richard Henderson <rth@tamu.edu>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef PT_EI
+# define PT_EI extern inline
+#endif
+
+/* Get some notion of the current stack.  Need not be exactly the top
+   of the stack, just something somewhere in the current frame.  */
+#define CURRENT_STACK_FRAME  stack_pointer
+register char * stack_pointer __asm__ ("%esp");
+
+
+/* Spinlock implementation; required.  */
+PT_EI int
+testandset (int *spinlock)
+{
+  int ret;
+
+  __asm__ __volatile__(
+       "xchgl %0, %1"
+       : "=r"(ret), "=m"(*spinlock)
+       : "0"(1), "m"(*spinlock)
+       : "memory");
+
+  return ret;
+}
+
+
+/* Compare-and-swap for semaphores.
+   Available on the 486 and above, but not on the 386.
+   We test dynamically whether it's available or not. */
+
+#define HAS_COMPARE_AND_SWAP
+#define TEST_FOR_COMPARE_AND_SWAP
+
+PT_EI int
+__compare_and_swap (long int *p, long int oldval, long int newval)
+{
+  char ret;
+  long int readval;
+
+  __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
+			: "=q" (ret), "=m" (*p), "=a" (readval)
+			: "r" (newval), "m" (*p), "a" (oldval)
+			: "memory");
+  return ret;
+}
+
+
+PT_EI int
+get_eflags (void)
+{
+  int res;
+  __asm__ __volatile__ ("pushfl; popl %0" : "=r" (res) : );
+  return res;
+}
+
+
+PT_EI void
+set_eflags (int newflags)
+{
+  __asm__ __volatile__ ("pushl %0; popfl" : : "r" (newflags) : "cc");
+}
+
+
+PT_EI int
+compare_and_swap_is_available (void)
+{
+  int oldflags = get_eflags ();
+  int changed;
+  /* Flip AC bit in EFLAGS.  */
+  set_eflags (oldflags ^ 0x40000);
+  /* See if bit changed.  */
+  changed = (get_eflags () ^ oldflags) & 0x40000;
+  /* Restore EFLAGS.  */
+  set_eflags (oldflags);
+  /* If the AC flag did not change, it's a 386 and it lacks cmpxchg.
+     Otherwise, it's a 486 or above and it has cmpxchg.  */
+  return changed != 0;
+}
diff --git a/libpthread/linuxthreads/sysdeps/i386/sigcontextinfo.h b/libpthread/linuxthreads/sysdeps/i386/sigcontextinfo.h
new file mode 100644
index 000000000..42c18b22b
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/i386/sigcontextinfo.h
@@ -0,0 +1,24 @@
+/* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#define SIGCONTEXT struct sigcontext
+#define SIGCONTEXT_EXTRA_ARGS
+#define GET_PC(ctx)	((void *) ctx.eip)
+#define GET_FRAME(ctx)	((void *) ctx.ebp)
+#define GET_STACK(ctx)	((void *) ctx.esp_at_signal)
diff --git a/libpthread/linuxthreads/sysdeps/i386/useldt.h b/libpthread/linuxthreads/sysdeps/i386/useldt.h
new file mode 100644
index 000000000..1a789e2e0
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/i386/useldt.h
@@ -0,0 +1,170 @@
+/* Special definitions for ix86 machine using segment register based
+   thread descriptor.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <stddef.h>	/* For offsetof.  */
+
+
+/* We don't want to include the kernel header.  So duplicate the
+   information.  */
+
+/* Structure passed on `modify_ldt' call.  */
+struct modify_ldt_ldt_s
+{
+  unsigned int entry_number;
+  unsigned long int base_addr;
+  unsigned int limit;
+  unsigned int seg_32bit:1;
+  unsigned int contents:2;
+  unsigned int read_exec_only:1;
+  unsigned int limit_in_pages:1;
+  unsigned int seg_not_present:1;
+  unsigned int useable:1;
+  unsigned int empty:25;
+};
+
+/* System call to set LDT entry.  */
+extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
+
+
+/* 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 \
+({									      \
+  register pthread_descr __self;					      \
+  __asm__ ("movl %%gs:%c1,%0" : "=r" (__self)				      \
+	   : "i" (offsetof (struct _pthread_descr_struct, p_self)));	      \
+  __self;								      \
+})
+
+/* Initialize the thread-unique value.  */
+#define INIT_THREAD_SELF(descr, nr) \
+{									      \
+  struct modify_ldt_ldt_s ldt_entry =					      \
+    { nr, (unsigned long int) descr, sizeof (*descr), 1, 0, 0, 0, 0, 1, 0 };  \
+  if (__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0)		      \
+    abort ();								      \
+  __asm__ __volatile__ ("movw %w0, %%gs" : : "r" (nr * 8 + 7));		      \
+}
+
+/* Free resources associated with thread descriptor.  */
+#define FREE_THREAD_SELF(descr, nr) \
+{									      \
+  struct modify_ldt_ldt_s ldt_entry =					      \
+    { nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 };					      \
+  __asm__ __volatile__ ("movw %w0,%%gs" : : "r" (0));			      \
+  __modify_ldt (1, &ldt_entry, sizeof (ldt_entry));			      \
+}
+
+/* Read member of the thread descriptor directly.  */
+#define THREAD_GETMEM(descr, member) \
+({									      \
+  __typeof__ (descr->member) __value;					      \
+  if (sizeof (__value) == 1)						      \
+    __asm__ __volatile__ ("movb %%gs:%P2,%b0"				      \
+			  : "=r" (__value)				      \
+			  : "0" (0),					      \
+			    "i" (offsetof (struct _pthread_descr_struct,      \
+					   member)));			      \
+  else									      \
+    {									      \
+      if (sizeof (__value) != 4)					      \
+	/* There should not be any value with a size other than 1 or 4.  */   \
+	abort ();							      \
+									      \
+      __asm__ __volatile__ ("movl %%gs:%P1,%0"				      \
+			    : "=r" (__value)				      \
+			    : "i" (offsetof (struct _pthread_descr_struct,    \
+					     member)));			      \
+    }									      \
+  __value;								      \
+})
+
+/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
+#define THREAD_GETMEM_NC(descr, member) \
+({									      \
+  __typeof__ (descr->member) __value;					      \
+  if (sizeof (__value) == 1)						      \
+    __asm__ __volatile__ ("movb %%gs:(%2),%b0"				      \
+			  : "=r" (__value)				      \
+			  : "0" (0),					      \
+			    "r" (offsetof (struct _pthread_descr_struct,      \
+					   member)));			      \
+  else									      \
+    {									      \
+      if (sizeof (__value) != 4)					      \
+	/* There should not be any value with a size other than 1 or 4.  */   \
+	abort ();							      \
+									      \
+      __asm__ __volatile__ ("movl %%gs:(%1),%0"				      \
+			    : "=r" (__value)				      \
+			    : "r" (offsetof (struct _pthread_descr_struct,    \
+					     member)));			      \
+    }									      \
+  __value;								      \
+})
+
+/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
+#define THREAD_SETMEM(descr, member, value) \
+({									      \
+  __typeof__ (descr->member) __value = (value);				      \
+  if (sizeof (__value) == 1)						      \
+    __asm__ __volatile__ ("movb %0,%%gs:%P1" :				      \
+			  : "r" (__value),				      \
+			    "i" (offsetof (struct _pthread_descr_struct,      \
+					   member)));			      \
+  else									      \
+    {									      \
+      if (sizeof (__value) != 4)					      \
+	/* There should not be any value with a size other than 1 or 4.  */   \
+	abort ();							      \
+									      \
+      __asm__ __volatile__ ("movl %0,%%gs:%P1" :			      \
+			    : "r" (__value),				      \
+			      "i" (offsetof (struct _pthread_descr_struct,    \
+					     member)));			      \
+    }									      \
+})
+
+/* Set member of the thread descriptor directly.  */
+#define THREAD_SETMEM_NC(descr, member, value) \
+({									      \
+  __typeof__ (descr->member) __value = (value);				      \
+  if (sizeof (__value) == 1)						      \
+    __asm__ __volatile__ ("movb %0,%%gs:(%1)" :				      \
+			  : "r" (__value),				      \
+			    "r" (offsetof (struct _pthread_descr_struct,      \
+					   member)));			      \
+  else									      \
+    {									      \
+      if (sizeof (__value) != 4)					      \
+	/* There should not be any value with a size other than 1 or 4.  */   \
+	abort ();							      \
+									      \
+      __asm__ __volatile__ ("movl %0,%%gs:(%1)" :			      \
+			    : "r" (__value),				      \
+			      "r" (offsetof (struct _pthread_descr_struct,    \
+					     member)));			      \
+    }									      \
+})