diff options
Diffstat (limited to 'libpthread/linuxthreads/sysdeps/arm')
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/arm/CVS/Entries | 4 | ||||
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/arm/CVS/Repository | 1 | ||||
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/arm/CVS/Root | 1 | ||||
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/arm/pspinlock.c | 82 | ||||
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/arm/pt-machine.h | 55 | ||||
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/arm/tls.h | 172 |
6 files changed, 315 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/sysdeps/arm/CVS/Entries b/libpthread/linuxthreads/sysdeps/arm/CVS/Entries new file mode 100644 index 000000000..eb84e2d5f --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/arm/CVS/Entries @@ -0,0 +1,4 @@ +/pspinlock.c/1.3/Wed Nov 16 21:06:54 2005// +/pt-machine.h/1.7/Wed Nov 16 21:06:54 2005// +/tls.h/1.1/Wed Nov 16 21:06:54 2005// +D diff --git a/libpthread/linuxthreads/sysdeps/arm/CVS/Repository b/libpthread/linuxthreads/sysdeps/arm/CVS/Repository new file mode 100644 index 000000000..ca0825598 --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/arm/CVS/Repository @@ -0,0 +1 @@ +ports/sysdeps/arm/linuxthreads diff --git a/libpthread/linuxthreads/sysdeps/arm/CVS/Root b/libpthread/linuxthreads/sysdeps/arm/CVS/Root new file mode 100644 index 000000000..ca45c5d4d --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/arm/CVS/Root @@ -0,0 +1 @@ +:pserver:anoncvs@sources.redhat.com:/cvs/glibc diff --git a/libpthread/linuxthreads/sysdeps/arm/pspinlock.c b/libpthread/linuxthreads/sysdeps/arm/pspinlock.c new file mode 100644 index 000000000..665e270b6 --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/arm/pspinlock.c @@ -0,0 +1,82 @@ +/* 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, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#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 new file mode 100644 index 000000000..a4c2f314c --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/arm/pt-machine.h @@ -0,0 +1,55 @@ +/* Machine-dependent pthreads configuration and inline functions. + ARM version. + Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Philip Blundell <philb@gnu.org>. + + 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, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _PT_MACHINE_H +#define _PT_MACHINE_H 1 + +#ifndef PT_EI +# define PT_EI extern inline __attribute__ ((always_inline)) +#endif + +extern long int testandset (int *spinlock); +extern int __compare_and_swap (long int *p, long int oldval, long int newval); + +/* 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) +{ + register unsigned int ret; + + __asm__ __volatile__("swp %0, %1, [%2]" + : "=r"(ret) + : "0"(1), "r"(spinlock)); + + return ret; +} + + +/* 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__ ("sp"); + +#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads/sysdeps/arm/tls.h b/libpthread/linuxthreads/sysdeps/arm/tls.h new file mode 100644 index 000000000..8057a5413 --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/arm/tls.h @@ -0,0 +1,172 @@ +/* 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#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 */ |