The Tor Browser: nsprpub/pr/src/md/unix/os

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /*

     7  *  Atomically add a new element to the top of the stack

     8  *

     9  *  usage : PR_StackPush(listp, elementp);

    10  *  -----------------------

    11  */

    13 #include "md/_irix.h"

    14 #ifdef _PR_HAVE_ATOMIC_CAS

    16 #include <sys/asm.h>

    17 #include <sys/regdef.h>

    19 LEAF(PR_StackPush)

    21 retry_push:

    22 .set noreorder

    23 		lw		v0,0(a0)

    24 		li		t1,1

    25 		beq		v0,t1,retry_push

    26 		move	t0,a1

    28         ll      v0,0(a0)

    29 		beq		v0,t1,retry_push

    30 		nop

    31 		sc		t1,0(a0)

    32 		beq		t1,0,retry_push

    33 		nop

    34 		sw		v0,0(a1)

    35 		sync

    36 		sw		t0,0(a0)

    37 		nop

    38 		nop

    39 		nop

    40 		nop

    41 		nop

    42 		nop

    43 		nop

    44 		nop

    45 		nop

    46 		nop

    47 		nop

    48 		nop

    49 		nop

    50 		nop

    51 		nop

    52 		nop

    53 		nop

    54 		nop

    55 		nop

    56 		nop

    57 		nop

    58 		nop

    59 		nop

    60 		nop

    61 		nop

    62 		nop

    63 		nop

    64 		nop

    65 		jr		ra

    66 		nop

    68 END(PR_StackPush)

    70 /*

    71  *

    72  *  Atomically remove the element at the top of the stack

    73  *

    74  *  usage : elemep = PR_StackPop(listp);

    75  *

    76  */

    78 LEAF(PR_StackPop)

    79 retry_pop:

    80 .set noreorder

    83 		lw		v0,0(a0)

    84 		li		t1,1

    85 		beq		v0,0,done

    86 		nop

    87 		beq		v0,t1,retry_pop

    88 		nop

    90         ll      v0,0(a0)

    91 		beq		v0,0,done

    92 		nop

    93 		beq		v0,t1,retry_pop

    94 		nop

    95 		sc		t1,0(a0)

    96 		beq		t1,0,retry_pop

    97 		nop

    98 		lw		t0,0(v0)

    99 		sw		t0,0(a0)

   100 done:

   101 		nop

   102 		nop

   103 		nop

   104 		nop

   105 		nop

   106 		nop

   107 		nop

   108 		nop

   109 		nop

   110 		nop

   111 		nop

   112 		nop

   113 		nop

   114 		nop

   115 		nop

   116 		nop

   117 		nop

   118 		nop

   119 		nop

   120 		nop

   121 		nop

   122 		nop

   123 		nop

   124 		nop

   125 		nop

   126 		nop

   127 		nop

   128 		nop

   129 		jr		ra

   130 		nop

   132 END(PR_StackPop)

   134 #endif /* _PR_HAVE_ATOMIC_CAS */

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