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113 lines
3.6 KiB
C
113 lines
3.6 KiB
C
/* Bounded-pointer definitions for PowerPC assembler.
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Copyright (C) 2000 Free Software Foundation, Inc.
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Contributed by Greg McGary <greg@mcgary.org>
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This file is part of the GNU C Library. Its master source is NOT part of
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the C library, however. The master source lives in the GNU MP Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#if __BOUNDED_POINTERS__
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/* Byte offsets of BP components. */
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# define oVALUE 0
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# define oLOW 4
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# define oHIGH 8
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/* Don't check bounds, just convert the BP register to its simple
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pointer value. */
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# define DISCARD_BOUNDS(rBP) \
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lwz rBP, oVALUE(rBP)
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/* Check low bound, with the side effect that the BP register is converted
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its simple pointer value. Move the high bound into a register for
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later use. */
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# define CHECK_BOUNDS_LOW(rBP, rLOW, rHIGH) \
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lwz rHIGH, oHIGH(rBP); \
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lwz rLOW, oLOW(rBP); \
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lwz rBP, oVALUE(rBP); \
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twllt rBP, rLOW
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/* Check the high bound, which is in a register, using the given
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conditional trap instruction. */
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# define CHECK_BOUNDS_HIGH(rVALUE, rHIGH, TWLcc) \
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TWLcc rVALUE, rHIGH
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/* Check the high bound, which is stored at the return-value's high
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bound slot, using the given conditional trap instruction. */
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# define CHECK_BOUNDS_HIGH_RTN(rVALUE, rHIGH, TWLcc) \
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lwz rHIGH, oHIGH(rRTN); \
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TWLcc rVALUE, rHIGH
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/* Check both bounds, with the side effect that the BP register is
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converted to its simple pointer value. */
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# define CHECK_BOUNDS_BOTH(rBP, rLOW, rHIGH) \
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CHECK_BOUNDS_LOW(rBP, rLOW, rHIGH); \
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twlge rBP, rHIGH
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/* Check bounds on a memory region of given length, with the side
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effect that the BP register is converted to its simple pointer
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value. */
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# define CHECK_BOUNDS_BOTH_WIDE(rBP, rLOW, rHIGH, rLENGTH) \
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CHECK_BOUNDS_LOW (rBP, rLOW, rHIGH); \
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sub rHIGH, rHIGH, rLENGTH; \
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twlgt rBP, rHIGH
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# define CHECK_BOUNDS_BOTH_WIDE_LIT(rBP, rLOW, rHIGH, LENGTH) \
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CHECK_BOUNDS_LOW (rBP, rLOW, rHIGH); \
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subi rHIGH, rHIGH, LENGTH; \
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twlgt rBP, rHIGH
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/* Store a pointer value register into the return-value's pointer
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value slot. */
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# define STORE_RETURN_VALUE(rVALUE) \
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stw rVALUE, oVALUE(rRTN)
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/* Store a low and high bounds into the return-value's pointer bounds
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slots. */
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# define STORE_RETURN_BOUNDS(rLOW, rHIGH) \
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stw rLOW, oLOW(rRTN); \
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stw rHIGH, oHIGH(rRTN)
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/* Stuff zero value/low/high into the BP addressed by rRTN. */
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# define RETURN_NULL_BOUNDED_POINTER \
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li r4, 0; \
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STORE_RETURN_VALUE (r4); \
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STORE_RETURN_BOUNDS (r4, r4)
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#else
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# define DISCARD_BOUNDS(rBP)
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# define CHECK_BOUNDS_LOW(rBP, rLOW, rHIGH)
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# define CHECK_BOUNDS_HIGH(rVALUE, rHIGH, TWLcc)
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# define CHECK_BOUNDS_HIGH_RTN(rVALUE, rHIGH, TWLcc)
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# define CHECK_BOUNDS_BOTH(rBP, rLOW, rHIGH)
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# define CHECK_BOUNDS_BOTH_WIDE(rBP, rLOW, rHIGH, rLENGTH)
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# define CHECK_BOUNDS_BOTH_WIDE_LIT(rBP, rLOW, rHIGH, LENGTH)
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# define STORE_RETURN_VALUE(rVALUE)
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# define STORE_RETURN_BOUNDS(rLOW, rHIGH)
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# define RETURN_NULL_BOUNDED_POINTER li rRTN, 0
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#endif
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