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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/mips
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/mips')
-rw-r--r--libpthread/linuxthreads/sysdeps/mips/pspinlock.c95
-rw-r--r--libpthread/linuxthreads/sysdeps/mips/pt-machine.h41
-rw-r--r--libpthread/linuxthreads/sysdeps/mips/tls.h169
3 files changed, 29 insertions, 276 deletions
diff --git a/libpthread/linuxthreads/sysdeps/mips/pspinlock.c b/libpthread/linuxthreads/sysdeps/mips/pspinlock.c
deleted file mode 100644
index 7b9205ef0..000000000
--- a/libpthread/linuxthreads/sysdeps/mips/pspinlock.c
+++ /dev/null
@@ -1,95 +0,0 @@
-/* POSIX spinlock implementation. MIPS version.
- Copyright (C) 2000, 2002, 2003, 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; see the file COPYING.LIB. If
- not, see <http://www.gnu.org/licenses/>. */
-
-#include <errno.h>
-#include <pthread.h>
-#include <sgidefs.h>
-#include <sys/tas.h>
-#include "internals.h"
-
-/* This implementation is similar to the one used in the Linux kernel. */
-int
-__pthread_spin_lock (pthread_spinlock_t *lock)
-{
- unsigned int tmp1, tmp2;
-
- __asm__ __volatile__
- ("\t\t\t# spin_lock\n"
- "1:\n\t"
- ".set push\n\t"
-#if _MIPS_SIM == _ABIO32
- ".set mips2\n\t"
-#endif
- "ll %1,%3\n\t"
- "li %2,1\n\t"
- "bnez %1,1b\n\t"
- "sc %2,%0\n\t"
- ".set pop\n\t"
- "beqz %2,1b"
- : "=m" (*lock), "=&r" (tmp1), "=&r" (tmp2)
- : "m" (*lock)
- : "memory");
-
- return 0;
-}
-
-weak_alias (__pthread_spin_lock, pthread_spin_lock)
-
-
-int
-__pthread_spin_trylock (pthread_spinlock_t *lock)
-{
- /* To be done. */
- return 0;
-}
-weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
-
-
-int
-__pthread_spin_unlock (pthread_spinlock_t *lock)
-{
- __asm__ __volatile__
- ("\t\t\t# spin_unlock\n\t"
- "sw $0,%0"
- : "=m" (*lock)
- :
- : "memory");
- return 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. */
- *lock = 0;
- return 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/mips/pt-machine.h b/libpthread/linuxthreads/sysdeps/mips/pt-machine.h
index 74e8807eb..caaf9a7c0 100644
--- a/libpthread/linuxthreads/sysdeps/mips/pt-machine.h
+++ b/libpthread/linuxthreads/sysdeps/mips/pt-machine.h
@@ -24,13 +24,40 @@
#define _PT_MACHINE_H 1
#include <features.h>
-#include <sgidefs.h>
-#include <sys/tas.h>
#ifndef PT_EI
# define PT_EI __extern_always_inline
#endif
+/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000. */
+static __inline__ int
+__NTH (_test_and_set (int *p, int v))
+{
+ int r, t;
+
+ __asm__ __volatile__
+ ("/* Inline test and set */\n"
+ "1:\n\t"
+ ".set push\n\t"
+ ".set mips2\n\t"
+ "ll %0,%3\n\t"
+ "move %1,%4\n\t"
+ "beq %0,%4,2f\n\t"
+ "sc %1,%2\n\t"
+ ".set pop\n\t"
+ "beqz %1,1b\n"
+ "2:\n\t"
+ "/* End test and set */"
+ : "=&r" (r), "=&r" (t), "=m" (*p)
+ : "m" (*p), "r" (v)
+ : "memory");
+
+ return r;
+}
+
+
/* Spinlock implementation; required. */
PT_EI long int
@@ -58,22 +85,12 @@ __compare_and_swap (long int *p, long int oldval, long int newval)
("/* Inline compare & swap */\n"
"1:\n\t"
".set push\n\t"
-#if _MIPS_SIM == _ABIO32
".set mips2\n\t"
-#endif
-#if _MIPS_SIM == _ABI64
- "lld %1,%5\n\t"
-#else
"ll %1,%5\n\t"
-#endif
"move %0,$0\n\t"
"bne %1,%3,2f\n\t"
"move %0,%4\n\t"
-#if _MIPS_SIM == _ABI64
- "scd %0,%2\n\t"
-#else
"sc %0,%2\n\t"
-#endif
".set pop\n\t"
"beqz %0,1b\n"
"2:\n\t"
diff --git a/libpthread/linuxthreads/sysdeps/mips/tls.h b/libpthread/linuxthreads/sysdeps/mips/tls.h
deleted file mode 100644
index 4e7887a74..000000000
--- a/libpthread/linuxthreads/sysdeps/mips/tls.h
+++ /dev/null
@@ -1,169 +0,0 @@
-/* Definitions for thread-local data handling. linuxthreads/MIPS version.
- Copyright (C) 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, 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;
-
-# define READ_THREAD_POINTER() \
- ({ void *__result; \
- __asm__ __volatile__ (".set\tpush\n\t.set\tmips32r2\n\t" \
- "rdhwr\t%0, $29\n\t.set\tpop" : "=v" (__result)); \
- __result; })
-
-#else /* __ASSEMBLER__ */
-# include <tcb-offsets.h>
-
-/* Note: rd must be $v1 to be ABI-conformant. */
-# define READ_THREAD_POINTER(rd) \
- .set push; \
- .set mips32r2; \
- rdhwr rd, $29; \
- .set pop
-#endif /* __ASSEMBLER__ */
-
-/* LinuxThreads can only use TLS if both floating stacks (in the MIPS case,
- that means support for "rdhwr") 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, but
- it hardly seems worth it. Use NPTL if you can.
-
- 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__
-
-/* This layout is actually wholly private and not affected by the ABI.
- Nor does it overlap the pthread data structure, so we need nothing
- extra here at all. */
-typedef struct
-{
- dtv_t *dtv;
- void *private;
-} tcbhead_t;
-
-/* This is the size of the initial TCB. */
-# define TLS_INIT_TCB_SIZE 0
-
-/* Alignment requirements for the initial TCB. */
-# define TLS_INIT_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
-
-/* This is the size of the TCB. */
-# define TLS_TCB_SIZE 0
-
-/* Alignment requirements for the TCB. */
-# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
-
-/* This is the size we need before TCB. */
-# define TLS_PRE_TCB_SIZE \
- (sizeof (struct _pthread_descr_struct) \
- + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
-
-/* The thread pointer (in hardware register $29) points to the end of
- the TCB + 0x7000, as for PowerPC. The pthread_descr structure is
- immediately in front of the TCB. */
-#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))[-1].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))[-1].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 (set_thread_area, err, 1, \
- (char *) (tcbp) + TLS_TCB_OFFSET); \
- 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 *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv)
-
-/* Return the thread descriptor for the current thread. */
-# undef THREAD_SELF
-# define THREAD_SELF \
- ((pthread_descr) (READ_THREAD_POINTER () \
- - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
-
-/* Get the thread descriptor definition. */
-# include <linuxthreads/descr.h>
-
-/* l_tls_offset == 0 is perfectly valid on MIPS, so we have to use some
- different value to mean unset l_tls_offset. */
-# define NO_TLS_OFFSET -1
-
-/* Initializing the thread pointer requires a syscall which may not be
- available, so don't do it if we don't need to. */
-# define TLS_INIT_TP_EXPENSIVE 1
-
-# endif /* __ASSEMBLER__ */
-
-#endif /* HAVE_TLS_SUPPORT */
-
-#endif /* tls.h */