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Diffstat (limited to '')
-rw-r--r-- | src/VBox/ExtPacks/VBoxDTrace/onnv/lib/libdtrace/common/dt_regset.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/VBox/ExtPacks/VBoxDTrace/onnv/lib/libdtrace/common/dt_regset.c b/src/VBox/ExtPacks/VBoxDTrace/onnv/lib/libdtrace/common/dt_regset.c new file mode 100644 index 00000000..9ae66f99 --- /dev/null +++ b/src/VBox/ExtPacks/VBoxDTrace/onnv/lib/libdtrace/common/dt_regset.c @@ -0,0 +1,112 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2003 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#ifndef VBOX +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <sys/types.h> +#include <sys/bitmap.h> +#include <assert.h> +#include <strings.h> +#include <stdlib.h> +#else /* VBOX */ +# include <iprt/asm.h> +# include "VBoxDTraceLibCWrappers.h" +#endif /* VBOX */ + +#include <dt_regset.h> + +dt_regset_t * +dt_regset_create(ulong_t size) +{ + ulong_t n = BT_BITOUL(size + 1); /* + 1 for %r0 */ + dt_regset_t *drp = malloc(sizeof (dt_regset_t)); + + if (drp == NULL) + return (NULL); + + drp->dr_bitmap = malloc(sizeof (ulong_t) * n); + drp->dr_size = size + 1; + + if (drp->dr_bitmap == NULL) { + dt_regset_destroy(drp); + return (NULL); + } + + bzero(drp->dr_bitmap, sizeof (ulong_t) * n); + return (drp); +} + +void +dt_regset_destroy(dt_regset_t *drp) +{ + free(drp->dr_bitmap); + free(drp); +} + +void +dt_regset_reset(dt_regset_t *drp) +{ + bzero(drp->dr_bitmap, sizeof (ulong_t) * BT_BITOUL(drp->dr_size)); +} + +int +dt_regset_alloc(dt_regset_t *drp) +{ + ulong_t nbits = drp->dr_size - 1; + ulong_t maxw = nbits >> BT_ULSHIFT; + ulong_t wx; + + for (wx = 0; wx <= maxw; wx++) { + if (drp->dr_bitmap[wx] != ~0UL) + break; + } + + if (wx <= maxw) { + ulong_t maxb = (wx == maxw) ? nbits & BT_ULMASK : BT_NBIPUL - 1; + ulong_t word = drp->dr_bitmap[wx]; + ulong_t bit, bx; + int reg; + + for (bit = 1, bx = 0; bx <= maxb; bx++, bit <<= 1) { + if ((word & bit) == 0) { + reg = (int)((wx << BT_ULSHIFT) | bx); + BT_SET(drp->dr_bitmap, reg); + return (reg); + } + } + } + + return (-1); /* no available registers */ +} + +void +dt_regset_free(dt_regset_t *drp, int reg) +{ + assert(reg > 0 && (unsigned /*vbox*/)reg < drp->dr_size); + assert(BT_TEST(drp->dr_bitmap, reg) != 0); + BT_CLEAR(drp->dr_bitmap, reg); +} |