97 lines
1.8 KiB
ArmAsm
97 lines
1.8 KiB
ArmAsm
/* stack_measuring.S */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2010 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <avr/io.h>
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.extern __brkval
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.global stack_measure_init
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stack_measure_init:
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movw r30, r24
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lds r20, __brkval
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lds r21, __brkval+1
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in r0, _SFR_IO_ADDR(SREG)
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cli
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in r26, _SFR_IO_ADDR(SPL)
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out _SFR_IO_ADDR(SREG), r0
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in r27, _SFR_IO_ADDR(SPH)
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st Z+, r20
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st Z+, r21
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st Z+, r26
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st Z+, r27
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st Z, r22
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movw r24, r26
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sub r24, r20
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sbc r25, r21
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sbiw r24, 1
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st X, r22
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1: st -X, r22
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sbiw r24, 1
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brne 1b
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ret
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.global stack_measure_final
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stack_measure_final:
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movw r30, r24
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lds r20, __brkval
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lds r21, __brkval+1
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ld r26, Z+
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ld r27, Z+
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cp r20, r26
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cpc r21, r27
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brlo 1f
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movw r26, r20
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1:
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adiw r26, 1
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ld r24, Z+
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ld r25, Z+
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ld r22, Z
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sub r24, r26
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sbc r25, r27
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adiw r24, 2
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1:
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sbiw r24, 1
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breq 2f
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ld r20, X+
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cpse r20, r22
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2: ret
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rjmp 1b
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/* for testing only
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.global stack_measure_usestack
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stack_measure_usestack:
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adiw r24, 0
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brne 2f
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1: ret
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2:
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in r0, _SFR_IO_ADDR(SREG)
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cli
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in r26, _SFR_IO_ADDR(SPL)
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out _SFR_IO_ADDR(SREG), r0
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in r27, _SFR_IO_ADDR(SPH)
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st X, r22
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sbiw r24, 1
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breq 1b
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3: st -X, r22
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sbiw r24, 1
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breq 1b
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rjmp 3b
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*/
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