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7498d7676d
There are a few .set mips* assembler directives used in the MIPS specific
sysdep code that force an instruction to be assembled for a specific ISA.
The reason for these is to allow an instruction to be encoded when it might
not be supported in the current ISA (when the code is run the Linux kernel
will trap and emulate any unsupported instructions). Unfortunately forcing
a specific ISA means that when assembling for a newer ISA, where the
instruction has a different encoding, the wrong encoding will be used.
* sysdeps/mips/bits/atomic.h [_MIPS_SIM == _ABIO32] (MIPS_PUSH_MIPS2):
Only use .set mips2 if the current ISA is below mips2.
* sysdeps/mips/sys/tas.h [_MIPS_SIM == _ABIO32] (_test_and_set):
Likewise.
* sysdeps/mips/nptl/tls.h (READ_THREAD_POINTER): Only use .set
mips32r2 if the current ISA is below mips32r2.
* sysdeps/mips/tls-macros.h (TLS_RDHWR): New define.
(TLS_IE): Updated to use the TLD_RDHWR macro.
(TLS_LE): Likewise.
* sysdeps/unix/mips/sysdep.h (__mips_isa_rev): Moved out of #ifdef
__ASSEMBLER__ condition.
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/* Copyright (C) 2000-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SYS_TAS_H
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#define _SYS_TAS_H 1
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#include <features.h>
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#include <sgidefs.h>
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__BEGIN_DECLS
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extern int _test_and_set (int *__p, int __v)
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__THROW __attribute__ ((__nomips16__));
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#ifdef __USE_EXTERN_INLINES
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# ifndef _EXTERN_INLINE
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# define _EXTERN_INLINE __extern_inline
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# endif
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_EXTERN_INLINE int __attribute__ ((__nomips16__))
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__NTH (_test_and_set (int *__p, int __v))
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{
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int __r, __t;
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__asm__ __volatile__
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("/* Inline test and set */\n"
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".set push\n\t"
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#if _MIPS_SIM == _ABIO32 && __mips < 2
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".set mips2\n\t"
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#endif
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"sync\n\t"
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"1:\n\t"
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"ll %0,%3\n\t"
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"move %1,%4\n\t"
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"beq %0,%4,2f\n\t"
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"sc %1,%2\n\t"
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"beqz %1,1b\n"
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"sync\n\t"
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".set pop\n\t"
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"2:\n\t"
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"/* End test and set */"
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: "=&r" (__r), "=&r" (__t), "=m" (*__p)
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: "m" (*__p), "r" (__v)
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: "memory");
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return __r;
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}
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#endif /* __USE_EXTERN_INLINES */
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__END_DECLS
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#endif /* sys/tas.h */
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