| /* Bounded-pointer definitions for PowerPC assembler. |
| Copyright (C) 2000 Free Software Foundation, Inc. |
| Contributed by Greg McGary <greg@mcgary.org> |
| This file is part of the GNU C Library. Its master source is NOT part of |
| the C library, however. The master source lives in the GNU MP Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #if __BOUNDED_POINTERS__ |
| |
| /* Byte offsets of BP components. */ |
| # define oVALUE 0 |
| # define oLOW 4 |
| # define oHIGH 8 |
| |
| /* Don't check bounds, just convert the BP register to its simple |
| pointer value. */ |
| |
| # define DISCARD_BOUNDS(rBP) \ |
| lwz rBP, oVALUE(rBP) |
| |
| /* Check low bound, with the side effect that the BP register is converted |
| its simple pointer value. Move the high bound into a register for |
| later use. */ |
| |
| # define CHECK_BOUNDS_LOW(rBP, rLOW, rHIGH) \ |
| lwz rHIGH, oHIGH(rBP); \ |
| lwz rLOW, oLOW(rBP); \ |
| lwz rBP, oVALUE(rBP); \ |
| twllt rBP, rLOW |
| |
| /* Check the high bound, which is in a register, using the given |
| conditional trap instruction. */ |
| |
| # define CHECK_BOUNDS_HIGH(rVALUE, rHIGH, TWLcc) \ |
| TWLcc rVALUE, rHIGH |
| |
| /* Check the high bound, which is stored at the return-value's high |
| bound slot, using the given conditional trap instruction. */ |
| |
| # define CHECK_BOUNDS_HIGH_RTN(rVALUE, rHIGH, TWLcc) \ |
| lwz rHIGH, oHIGH(rRTN); \ |
| TWLcc rVALUE, rHIGH |
| |
| /* Check both bounds, with the side effect that the BP register is |
| converted to its simple pointer value. */ |
| |
| # define CHECK_BOUNDS_BOTH(rBP, rLOW, rHIGH) \ |
| CHECK_BOUNDS_LOW(rBP, rLOW, rHIGH); \ |
| twlge rBP, rHIGH |
| |
| /* Check bounds on a memory region of given length, with the side |
| effect that the BP register is converted to its simple pointer |
| value. */ |
| |
| # define CHECK_BOUNDS_BOTH_WIDE(rBP, rLOW, rHIGH, rLENGTH) \ |
| CHECK_BOUNDS_LOW (rBP, rLOW, rHIGH); \ |
| sub rHIGH, rHIGH, rLENGTH; \ |
| twlgt rBP, rHIGH |
| |
| # define CHECK_BOUNDS_BOTH_WIDE_LIT(rBP, rLOW, rHIGH, LENGTH) \ |
| CHECK_BOUNDS_LOW (rBP, rLOW, rHIGH); \ |
| subi rHIGH, rHIGH, LENGTH; \ |
| twlgt rBP, rHIGH |
| |
| /* Store a pointer value register into the return-value's pointer |
| value slot. */ |
| |
| # define STORE_RETURN_VALUE(rVALUE) \ |
| stw rVALUE, oVALUE(rRTN) |
| |
| /* Store a low and high bounds into the return-value's pointer bounds |
| slots. */ |
| |
| # define STORE_RETURN_BOUNDS(rLOW, rHIGH) \ |
| stw rLOW, oLOW(rRTN); \ |
| stw rHIGH, oHIGH(rRTN) |
| |
| /* Stuff zero value/low/high into the BP addressed by rRTN. */ |
| |
| # define RETURN_NULL_BOUNDED_POINTER \ |
| li r4, 0; \ |
| STORE_RETURN_VALUE (r4); \ |
| STORE_RETURN_BOUNDS (r4, r4) |
| |
| #else |
| |
| # define DISCARD_BOUNDS(rBP) |
| # define CHECK_BOUNDS_LOW(rBP, rLOW, rHIGH) |
| # define CHECK_BOUNDS_HIGH(rVALUE, rHIGH, TWLcc) |
| # define CHECK_BOUNDS_HIGH_RTN(rVALUE, rHIGH, TWLcc) |
| # define CHECK_BOUNDS_BOTH(rBP, rLOW, rHIGH) |
| # define CHECK_BOUNDS_BOTH_WIDE(rBP, rLOW, rHIGH, rLENGTH) |
| # define CHECK_BOUNDS_BOTH_WIDE_LIT(rBP, rLOW, rHIGH, LENGTH) |
| # define STORE_RETURN_VALUE(rVALUE) |
| # define STORE_RETURN_BOUNDS(rLOW, rHIGH) |
| |
| # define RETURN_NULL_BOUNDED_POINTER li rRTN, 0 |
| |
| #endif |
| |