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author | daney <daney@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-10-22 16:35:17 +0000 |
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committer | daney <daney@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-10-22 16:35:17 +0000 |
commit | 5f63cb3eb8f54827a80424dd346620fbf279ef6f (patch) | |
tree | d171c045404a295d18ee746a18e6fc270c642ae0 /libjava/sysdep/mips | |
parent | 31838f66e13ef4480e69104284ee846406320281 (diff) | |
download | ppe42-gcc-5f63cb3eb8f54827a80424dd346620fbf279ef6f.tar.gz ppe42-gcc-5f63cb3eb8f54827a80424dd346620fbf279ef6f.zip |
2003-10-22 David Daney <ddaney@avtrex.com)
* include/mips-signal.h: New file.
* sysdep/dwarf2-backtrace.cc: New file.
* sysdep/mips: New directory.
* sysdep/mips/locks.h: New file.
* Makefile.am(extra_cc_files): New, to allow extra c++ files to be
added to libgcj.
(extra_cc_source_files): Ditto.
* configure.host(disable_dladdr): New shell variable passed to
configure.
(mips*-*-linux*): sysdeps_dir=mips,
can_unwind_signal=yes, disable_dladdr=yes, use -mxgot.
(mipsel*-linux* | mipsisa32el*-linux*): Enable hash synchronization.
* configure.in:(mips*-*-linux*): Use sysdep/dwarf2-backtrace.cc to
generate backtrace, and include/mips-signal.h as SIGNAL_HANDLER
(HAVE_DLADDR): Make it depend on setting of disable_dladdr.
(EXTRA_CC_FILES): New, to support conditional addition of
sysdep/dwarf2-backtrace.cc.
* configure: Regenerated.
* Makefile.in: Regenerated.
* gcj/Makefile.in: Regenerated.
* include/config.h.in: Regenerated.
* include/Makefile.in: Regenerated.
* testsuite/Makefile.in: Regenerated.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@72808 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libjava/sysdep/mips')
-rw-r--r-- | libjava/sysdep/mips/locks.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/libjava/sysdep/mips/locks.h b/libjava/sysdep/mips/locks.h new file mode 100644 index 00000000000..80509cadbbd --- /dev/null +++ b/libjava/sysdep/mips/locks.h @@ -0,0 +1,109 @@ +// locks.h - Thread synchronization primitives. MIPS implementation. + +/* Copyright (C) 2003 Free Software Foundation + + This file is part of libgcj. + +This software is copyrighted work licensed under the terms of the +Libgcj License. Please consult the file "LIBGCJ_LICENSE" for +details. */ + +#ifndef __SYSDEP_LOCKS_H__ +#define __SYSDEP_LOCKS_H__ + +/* Integer type big enough for object address. */ +typedef unsigned obj_addr_t __attribute__((__mode__(__pointer__))); + + +// Atomically replace *addr by new_val if it was initially equal to old. +// Return true if the comparison succeeded. +// Assumed to have acquire semantics, i.e. later memory operations +// cannot execute before the compare_and_swap finishes. +inline static bool +compare_and_swap(volatile obj_addr_t *addr, + obj_addr_t old, + obj_addr_t new_val) +{ + long result; + __asm__ __volatile__(".set\tpush\n\t" + ".set\tnoreorder\n\t" + ".set\tnomacro\n\t" + "1:\n\t" +#if _MIPS_SIM == _ABIO32 + ".set\tmips2\n\t" +#endif + "ll\t%[result],0(%[addr])\n\t" + "bne\t%[result],%[old],2f\n\t" + "move\t%[result],$0\n\t" // delay slot + "move\t%[result],%[new_val]\n\t" + "sc\t%[result],0(%[addr])\n\t" + "beq\t%[result],$0,1b\n\t" + "nop\n\t" // delay slot + "2:\n\t" + ".set\tpop" + : [result] "=&r" (result) + : [addr] "r" (addr), [new_val] "r" (new_val), [old] "r"(old) + : "memory"); + return (bool) result; +} + +// Set *addr to new_val with release semantics, i.e. making sure +// that prior loads and stores complete before this +// assignment. +inline static void +release_set(volatile obj_addr_t *addr, obj_addr_t new_val) +{ + __asm__ __volatile__(".set\tpush\n\t" +#if _MIPS_SIM == _ABIO32 + ".set\tmips2\n\t" +#endif + "sync\n\t" + ".set\tpop" : : : "memory"); + *(addr) = new_val; +} + +// Compare_and_swap with release semantics instead of acquire semantics. +// On many architecture, the operation makes both guarantees, so the +// implementation can be the same. +inline static bool +compare_and_swap_release(volatile obj_addr_t *addr, + obj_addr_t old, + obj_addr_t new_val) +{ + __asm__ __volatile__(".set\tpush\n\t" +#if _MIPS_SIM == _ABIO32 + ".set\tmips2\n\t" +#endif + "sync\n\t" + ".set\tpop" : : : "memory"); + return compare_and_swap(addr, old, new_val); +} + +// Ensure that subsequent instructions do not execute on stale +// data that was loaded from memory before the barrier. +// On X86, the hardware ensures that reads are properly ordered. +inline static void +read_barrier() +{ + __asm__ __volatile__(".set\tpush\n\t" +#if _MIPS_SIM == _ABIO32 + ".set\tmips2\n\t" +#endif + "sync\n\t" + ".set\tpop" : : : "memory"); +} + +// Ensure that prior stores to memory are completed with respect to other +// processors. +inline static void +write_barrier() +{ + __asm__ __volatile__(".set\tpush\n\t" +#if _MIPS_SIM == _ABIO32 + ".set\tmips2\n\t" +#endif + "sync\n\t" + ".set\tpop" : : : "memory"); +} + +#endif // __SYSDEP_LOCKS_H__ |