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authorWaldemar Brodkorb <wbx@uclibc-ng.org>2016-05-18 18:41:24 +0200
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2016-05-18 18:41:24 +0200
commit6a8ccc95528f5e86a8770ed15ce89609b5b3dee9 (patch)
treebbd4df35b4d4a6a8b00d7a5e61fb2668b850ad62 /libpthread/linuxthreads/sysdeps/arm
parent398a27a5b323956344b4f831d892fed3bd9813c7 (diff)
remove linuxthreads.new, rename linuxthreads.old
Linuxthreads.new isn't really useful with the existence of NPTL/TLS for well supported architectures. There is no reason to use LT.new for ARM/MIPS or other architectures supporting NPTL/TLS. It is not available for noMMU architectures like Blackfin or FR-V. To simplify the live of the few uClibc-ng developers, LT.new is removed and LT.old is renamed to LT. LINUXTHREADS_OLD -> UCLIBC_HAS_LINUXTHREADS
Diffstat (limited to 'libpthread/linuxthreads/sysdeps/arm')
-rw-r--r--libpthread/linuxthreads/sysdeps/arm/pspinlock.c81
-rw-r--r--libpthread/linuxthreads/sysdeps/arm/pt-machine.h68
-rw-r--r--libpthread/linuxthreads/sysdeps/arm/sysdep-cancel.h8
-rw-r--r--libpthread/linuxthreads/sysdeps/arm/tls.h171
4 files changed, 62 insertions, 266 deletions
diff --git a/libpthread/linuxthreads/sysdeps/arm/pspinlock.c b/libpthread/linuxthreads/sysdeps/arm/pspinlock.c
deleted file mode 100644
index 691085270..000000000
--- a/libpthread/linuxthreads/sysdeps/arm/pspinlock.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/* POSIX spinlock implementation. Arm version.
- Copyright (C) 2000 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; see the file COPYING.LIB. If
- not, see <http://www.gnu.org/licenses/>. */
-
-#include <errno.h>
-#include <pthread.h>
-#include "internals.h"
-
-
-int
-__pthread_spin_lock (pthread_spinlock_t *lock)
-{
- unsigned int val;
-
- do
- __asm__ __volatile__ ("swp %0, %1, [%2]"
- : "=r" (val)
- : "0" (1), "r" (lock)
- : "memory");
- while (val != 0);
-
- return 0;
-}
-weak_alias (__pthread_spin_lock, pthread_spin_lock)
-
-
-int
-__pthread_spin_trylock (pthread_spinlock_t *lock)
-{
- unsigned int val;
-
- __asm__ __volatile__ ("swp %0, %1, [%2]"
- : "=r" (val)
- : "0" (1), "r" (lock)
- : "memory");
-
- return val ? EBUSY : 0;
-}
-weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
-
-
-int
-__pthread_spin_unlock (pthread_spinlock_t *lock)
-{
- return *lock = 0;
-}
-weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
-
-
-int
-__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
-{
- /* We can ignore the `pshared' parameter. Since we are busy-waiting
- all processes which can access the memory location `lock' points
- to can use the spinlock. */
- return *lock = 0;
-}
-weak_alias (__pthread_spin_init, pthread_spin_init)
-
-
-int
-__pthread_spin_destroy (pthread_spinlock_t *lock)
-{
- /* Nothing to do. */
- return 0;
-}
-weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/libpthread/linuxthreads/sysdeps/arm/pt-machine.h b/libpthread/linuxthreads/sysdeps/arm/pt-machine.h
index 0a455b97d..fc17e9bc7 100644
--- a/libpthread/linuxthreads/sysdeps/arm/pt-machine.h
+++ b/libpthread/linuxthreads/sysdeps/arm/pt-machine.h
@@ -1,6 +1,6 @@
/* Machine-dependent pthreads configuration and inline functions.
ARM version.
- Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 1997, 1998, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Philip Blundell <philb@gnu.org>.
@@ -21,29 +21,85 @@
#ifndef _PT_MACHINE_H
#define _PT_MACHINE_H 1
-#include <features.h>
+#include <sys/syscall.h>
+#include <unistd.h>
#ifndef PT_EI
# define PT_EI __extern_always_inline
#endif
+#if defined(__thumb2__)
+PT_EI long int ldrex(int *spinlock)
+{
+ long int ret;
+ __asm__ __volatile__(
+ "ldrex %0, [%1]\n"
+ : "=r"(ret)
+ : "r"(spinlock) : "memory");
+ return ret;
+}
+
+PT_EI long int strex(int val, int *spinlock)
+{
+ long int ret;
+ __asm__ __volatile__(
+ "strex %0, %1, [%2]\n"
+ : "=r"(ret)
+ : "r" (val), "r"(spinlock) : "memory");
+ return ret;
+}
+
+/* Spinlock implementation; required. */
+PT_EI long int
+testandset (int *spinlock)
+{
+ register unsigned int ret;
+
+ do {
+ ret = ldrex(spinlock);
+ } while (strex(1, spinlock));
+
+ return ret;
+}
+
+#elif defined(__thumb__)
+
/* This will not work on ARM1 or ARM2 because SWP is lacking on those
machines. Unfortunately we have no way to detect this at compile
time; let's hope nobody tries to use one. */
/* Spinlock implementation; required. */
-PT_EI long int
-testandset (int *spinlock)
+PT_EI long int testandset (int *spinlock);
+PT_EI long int testandset (int *spinlock)
{
register unsigned int ret;
+ void *pc;
+ __asm__ __volatile__(
+ ".align 0\n"
+ "\tbx pc\n"
+ "\tnop\n"
+ "\t.arm\n"
+ "\tswp %0, %2, [%3]\n"
+ "\torr %1, pc, #1\n"
+ "\tbx %1\n"
+ "\t.force_thumb"
+ : "=r"(ret), "=r"(pc)
+ : "0"(1), "r"(spinlock));
+ return ret;
+}
+#else /* __thumb__ */
+
+PT_EI long int testandset (int *spinlock);
+PT_EI long int testandset (int *spinlock)
+{
+ register unsigned int ret;
__asm__ __volatile__("swp %0, %1, [%2]"
: "=r"(ret)
: "0"(1), "r"(spinlock));
-
return ret;
}
-
+#endif
/* Get some notion of the current stack. Need not be exactly the top
of the stack, just something somewhere in the current frame. */
diff --git a/libpthread/linuxthreads/sysdeps/arm/sysdep-cancel.h b/libpthread/linuxthreads/sysdeps/arm/sysdep-cancel.h
deleted file mode 100644
index ba6a1e04b..000000000
--- a/libpthread/linuxthreads/sysdeps/arm/sysdep-cancel.h
+++ /dev/null
@@ -1,8 +0,0 @@
-#include <sysdep.h>
-
-/* No multi-thread handling enabled. */
-#define SINGLE_THREAD_P (1)
-#define RTLD_SINGLE_THREAD_P (1)
-#define LIBC_CANCEL_ASYNC() 0 /* Just a dummy value. */
-#define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it. */
-#define LIBC_CANCEL_HANDLED() /* Nothing. */
diff --git a/libpthread/linuxthreads/sysdeps/arm/tls.h b/libpthread/linuxthreads/sysdeps/arm/tls.h
deleted file mode 100644
index df8d97009..000000000
--- a/libpthread/linuxthreads/sysdeps/arm/tls.h
+++ /dev/null
@@ -1,171 +0,0 @@
-/* Definitions for thread-local data handling. linuxthreads/ARM version.
- Copyright (C) 2004 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, see
- <http://www.gnu.org/licenses/>. */
-
-#ifndef _TLS_H
-#define _TLS_H
-
-#ifndef __ASSEMBLER__
-
-# include <stdbool.h>
-# include <pt-machine.h>
-# include <stddef.h>
-
-/* Type for the dtv. */
-typedef union dtv
-{
- size_t counter;
- struct
- {
- void *val;
- bool is_static;
- } pointer;
-} dtv_t;
-
-typedef struct
-{
- dtv_t *dtv;
-
- /* Reserved for the thread implementation. Unused in LinuxThreads. */
- void *private;
-} tcbhead_t;
-#endif
-
-
-/* We can support TLS only if the floating-stack support is available.
- However, we want to compile in the support and test at runtime whether
- the running kernel can support it or not. To avoid bothering with the
- TLS support code at all, use configure --without-tls.
-
- We need USE_TLS to be consistently defined, for ldsodefs.h conditionals.
- But some of the code below can cause problems in building libpthread
- (e.g. useldt.h will defined FLOATING_STACKS when it shouldn't). */
-
-/* LinuxThreads can only support TLS if both floating stacks and support
- from the tools are available.
-
- We have to define USE_TLS consistently, or ldsodefs.h will lay out types
- differently between an NPTL build and a LinuxThreads build. It can be set
- for libc.so and not libpthread.so, but only if we provide appropriate padding
- in the _pthread_descr_struct.
-
- Currently nothing defines FLOATING_STACKS. We could assume this based on
- kernel version once the TLS patches are available in kernel.org.
-
- To avoid bothering with the TLS support code at all, use configure
- --without-tls. */
-
-#if defined HAVE_TLS_SUPPORT \
- && (defined FLOATING_STACKS || !defined IS_IN_libpthread)
-
-/* Signal that TLS support is available. */
-# define USE_TLS 1
-
-/* Include padding in _pthread_descr_struct so that libc can find p_errno,
- if libpthread will only include the padding because of the !IS_IN_libpthread
- check. */
-#ifndef FLOATING_STACKS
-# define INCLUDE_TLS_PADDING 1
-#endif
-
-# ifndef __ASSEMBLER__
-/* Get system call information. */
-# include <sysdep.h>
-
-/* 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 DTV is allocated at the TP; the TCB is placed elsewhere. */
-# 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) \
- (((tcbhead_t *)__builtin_thread_pointer ())->dtv = (DTV))
-
-/* Return dtv of given thread descriptor. */
-# define GET_DTV(TCBP) \
- (((tcbhead_t *) (TCBP))->dtv)
-
-/* 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) \
- ({ INTERNAL_SYSCALL_DECL (err); \
- long result_var; \
- result_var = INTERNAL_SYSCALL_ARM (set_tls, err, 1, (TCBP)); \
- INTERNAL_SYSCALL_ERROR_P (result_var, err) \
- ? "unknown error" : NULL; })
-
-/* Return the address of the dtv for the current thread. */
-# define THREAD_DTV() \
- (((tcbhead_t *)__builtin_thread_pointer ())->dtv)
-
-/* Return the thread descriptor for the current thread. */
-# undef THREAD_SELF
-# define THREAD_SELF \
- ((pthread_descr)__builtin_thread_pointer () - 1)
-
-# undef INIT_THREAD_SELF
-# define INIT_THREAD_SELF(DESCR, NR) \
- TLS_INIT_TP ((struct _pthread_descr_struct *)(DESCR) + 1, 0)
-
-/* 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.
-
- In our case, we'd really prefer to use DESCR, since lots of
- PAL_code calls would be expensive. We can only trust that
- the compiler does its job and unifies the multiple
- __builtin_thread_pointer instances. */
-
-#define THREAD_GETMEM(descr, member) \
- ((void) sizeof (descr), THREAD_SELF->member)
-#define THREAD_GETMEM_NC(descr, member) \
- ((void) sizeof (descr), THREAD_SELF->member)
-#define THREAD_SETMEM(descr, member, value) \
- ((void) sizeof (descr), THREAD_SELF->member = (value))
-#define THREAD_SETMEM_NC(descr, member, value) \
- ((void) sizeof (descr), THREAD_SELF->member = (value))
-
-/* Initializing the thread pointer will generate a SIGILL if the syscall
- is not available. */
-#define TLS_INIT_TP_EXPENSIVE 1
-
-# endif /* HAVE_TLS_SUPPORT */
-#endif /* __ASSEMBLER__ */
-
-#endif /* tls.h */