diff options
Diffstat (limited to 'libpthread/linuxthreads/sysdeps/mips')
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/mips/pspinlock.c | 95 | ||||
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/mips/pt-machine.h | 41 | ||||
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/mips/tls.h | 169 |
3 files changed, 276 insertions, 29 deletions
diff --git a/libpthread/linuxthreads/sysdeps/mips/pspinlock.c b/libpthread/linuxthreads/sysdeps/mips/pspinlock.c new file mode 100644 index 000000000..7b9205ef0 --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/mips/pspinlock.c @@ -0,0 +1,95 @@ +/* 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 caaf9a7c0..74e8807eb 100644 --- a/libpthread/linuxthreads/sysdeps/mips/pt-machine.h +++ b/libpthread/linuxthreads/sysdeps/mips/pt-machine.h @@ -24,40 +24,13 @@ #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 @@ -85,12 +58,22 @@ __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 new file mode 100644 index 000000000..4e7887a74 --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/mips/tls.h @@ -0,0 +1,169 @@ +/* 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 */ |