41adcc32e9
References: https://www.illumos.org/issues/3021 https://www.illumos.org/issues/3022 https://www.illumos.org/issues/3023 https://www.illumos.org/issues/3024 https://www.illumos.org/issues/3025 https://www.illumos.org/issues/3026 Obtained from: ssh://anonhg@hg.illumos.org/illumos-gate
133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2012 by Delphix. All rights reserved.
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*/
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#include <sys/types.h>
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#include <sys/bitmap.h>
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#include <assert.h>
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#include <strings.h>
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#include <stdlib.h>
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#include <dt_regset.h>
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#include <dt_impl.h>
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dt_regset_t *
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dt_regset_create(ulong_t nregs)
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{
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ulong_t n = BT_BITOUL(nregs);
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dt_regset_t *drp = malloc(sizeof (dt_regset_t));
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if (drp == NULL)
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return (NULL);
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drp->dr_bitmap = malloc(sizeof (ulong_t) * n);
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drp->dr_size = nregs;
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if (drp->dr_bitmap == NULL) {
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dt_regset_destroy(drp);
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return (NULL);
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}
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bzero(drp->dr_bitmap, sizeof (ulong_t) * n);
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return (drp);
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}
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void
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dt_regset_destroy(dt_regset_t *drp)
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{
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free(drp->dr_bitmap);
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free(drp);
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}
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void
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dt_regset_reset(dt_regset_t *drp)
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{
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bzero(drp->dr_bitmap, sizeof (ulong_t) * BT_BITOUL(drp->dr_size));
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}
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void
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dt_regset_assert_free(dt_regset_t *drp)
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{
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int reg;
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boolean_t fail = B_FALSE;
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for (reg = 0; reg < drp->dr_size; reg++) {
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if (BT_TEST(drp->dr_bitmap, reg) != 0) {
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dt_dprintf("%%r%d was left allocated\n", reg);
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fail = B_TRUE;
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}
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}
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/*
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* We set this during dtest runs to check for register leaks.
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*/
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if (fail && getenv("DTRACE_DEBUG_REGSET") != NULL)
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abort();
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}
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int
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dt_regset_alloc(dt_regset_t *drp)
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{
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ulong_t nbits = drp->dr_size - 1;
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ulong_t maxw = nbits >> BT_ULSHIFT;
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ulong_t wx;
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for (wx = 0; wx <= maxw; wx++) {
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if (drp->dr_bitmap[wx] != ~0UL)
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break;
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}
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if (wx <= maxw) {
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ulong_t maxb = (wx == maxw) ? nbits & BT_ULMASK : BT_NBIPUL - 1;
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ulong_t word = drp->dr_bitmap[wx];
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ulong_t bit, bx;
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int reg;
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for (bit = 1, bx = 0; bx <= maxb; bx++, bit <<= 1) {
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if ((word & bit) == 0) {
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reg = (int)((wx << BT_ULSHIFT) | bx);
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BT_SET(drp->dr_bitmap, reg);
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return (reg);
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}
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}
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}
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xyerror(D_NOREG, "Insufficient registers to generate code");
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/*NOTREACHED*/
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return (-1);
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}
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void
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dt_regset_free(dt_regset_t *drp, int reg)
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{
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assert(reg >= 0 && reg < drp->dr_size);
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assert(BT_TEST(drp->dr_bitmap, reg) != 0);
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BT_CLEAR(drp->dr_bitmap, reg);
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}
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