diff options
Diffstat (limited to 'tools/node_modules/expresso/deps/jscoverage/js/lock_SunOS.s')
| -rw-r--r-- | tools/node_modules/expresso/deps/jscoverage/js/lock_SunOS.s | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/tools/node_modules/expresso/deps/jscoverage/js/lock_SunOS.s b/tools/node_modules/expresso/deps/jscoverage/js/lock_SunOS.s new file mode 100644 index 0000000..6feb202 --- /dev/null +++ b/tools/node_modules/expresso/deps/jscoverage/js/lock_SunOS.s @@ -0,0 +1,119 @@ +! +! ***** BEGIN LICENSE BLOCK ***** +! Version: MPL 1.1/GPL 2.0/LGPL 2.1 +! +! The contents of this file are subject to the Mozilla Public License Version +! 1.1 (the "License"); you may not use this file except in compliance with +! the License. You may obtain a copy of the License at +! http://www.mozilla.org/MPL/ +! +! Software distributed under the License is distributed on an "AS IS" basis, +! WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License +! for the specific language governing rights and limitations under the +! License. +! +! The Original Code is Mozilla Communicator client code, released +! March 31, 1998. +! +! The Initial Developer of the Original Code is +! Netscape Communications Corporation. +! Portions created by the Initial Developer are Copyright (C) 1998-1999 +! the Initial Developer. All Rights Reserved. +! +! Contributor(s): +! +! Alternatively, the contents of this file may be used under the terms of +! either the GNU General Public License Version 2 or later (the "GPL"), or +! the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), +! in which case the provisions of the GPL or the LGPL are applicable instead +! of those above. If you wish to allow use of your version of this file only +! under the terms of either the GPL or the LGPL, and not to allow others to +! use your version of this file under the terms of the MPL, indicate your +! decision by deleting the provisions above and replace them with the notice +! and other provisions required by the GPL or the LGPL. If you do not delete +! the provisions above, a recipient may use your version of this file under +! the terms of any one of the MPL, the GPL or the LGPL. +! +! ***** END LICENSE BLOCK ***** + +! +! atomic compare-and-swap routines for V8 sparc +! and for V8+ (ultrasparc) +! +! +! standard asm linkage macros; this module must be compiled +! with the -P option (use C preprocessor) + +#include <sys/asm_linkage.h> + +! ====================================================================== +! +! Perform the sequence *a = b atomically with respect to previous value +! of a (a0). If *a==a0 then assign *a to b, all in one atomic operation. +! Returns 1 if assignment happened, and 0 otherwise. +! +! usage : old_val = compare_and_swap(address, oldval, newval) +! +! ----------------------- +! Note on REGISTER USAGE: +! as this is a LEAF procedure, a new stack frame is not created; +! we use the caller stack frame so what would normally be %i (input) +! registers are actually %o (output registers). Also, we must not +! overwrite the contents of %l (local) registers as they are not +! assumed to be volatile during calls. +! +! So, the registers used are: +! %o0 [input] - the address of the value to increment +! %o1 [input] - the old value to compare with +! %o2 [input] - the new value to set for [%o0] +! %o3 [local] - work register +! ----------------------- +#ifndef ULTRA_SPARC +! v8 + + ENTRY(compare_and_swap) ! standard assembler/ELF prologue + + stbar + mov -1,%o3 ! busy flag + swap [%o0],%o3 ! get current value +l1: cmp %o3,-1 ! busy? + be,a l1 ! if so, spin + swap [%o0],%o3 ! using branch-delay to swap back value + cmp %o1,%o3 ! compare old with current + be,a l2 ! if equal then swap in new value + swap [%o0],%o2 ! done. + swap [%o0],%o3 ! otherwise, swap back current value + retl + mov 0,%o0 ! return false +l2: retl + mov 1,%o0 ! return true + + SET_SIZE(compare_and_swap) ! standard assembler/ELF epilogue + +! +! end +! +#else /* ULTRA_SPARC */ +! ====================================================================== +! +! v9 + + ENTRY(compare_and_swap) ! standard assembler/ELF prologue + + stbar + cas [%o0],%o1,%o2 ! compare *w with old value and set to new if equal + cmp %o1,%o2 ! did we succeed? + be,a m1 ! yes + mov 1,%o0 ! return true (annulled when no jump) + mov 0,%o0 ! return false +m1: retl + nop + + SET_SIZE(compare_and_swap) ! standard assembler/ELF epilogue + +! +! end +! +! ====================================================================== +! +#endif |