91 lines
1.8 KiB
ArmAsm
91 lines
1.8 KiB
ArmAsm
/**
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* \file seed-asm.S
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* \author Daniel Otte
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* \date 2007-06-1
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* \brief SEED parts in assembler for AVR
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* \par License
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* GPL
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*
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*/
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SPL = 0x3D
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SPH = 0x3E
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SREG = 0x3F
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/*******************************************************************************
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void changeendian32(uint32_t * a){
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*a = (*a & 0x000000FF) << 24 |
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(*a & 0x0000FF00) << 8 |
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(*a & 0x00FF0000) >> 8 |
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(*a & 0xFF000000) >> 24;
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}
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*/
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/*
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.global changeendian32
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; === change_endian32 ===
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; function that changes the endianess of a 32-bit word
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; param1: the 32-bit word
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; given in r25,r24,r23,22 (r25 is most significant)
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; modifys: r21, r22
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changeendian32:
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movw r20, r22 ; (r22,r23) --> (r20,r21)
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mov r22, r25
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mov r23, r24
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mov r24, r21
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mov r25, r20
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ret
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*/
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/*******************************************************************************
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uint32_t bigendian_sum32(uint32_t a, uint32_t b){
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changeendian32(&a);
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changeendian32(&b);
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a += b;
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changeendian32(&a);
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return a;
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}
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*/
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.global bigendian_sum32
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; === bigendian_sum32 ===
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; function that adds two 32-bit words in the bigendian way and returns the result
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; param1: the first 32-bit word
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; given in r25,r24,r23,22 (r25 is most significant for little endian)
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; param2: the second 32-bit word
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; given in r21,r20,r19,18 (r21 is most significant for little endian)
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; modifys:
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bigendian_sum32:
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add r25, r21
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adc r24, r20
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adc r23, r19
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adc r22, r18
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ret
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.global bigendian_sub32
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; === bigendian_sub32 ===
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; function that subtracts a 32-bit words from another in the bigendian way and returns the result
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; param1: the minuend 32-bit word
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; given in r25,r24,r23,22 (r25 is most significant for little endian)
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; param2: the subtrahend 32-bit word
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; given in r21,r20,r19,18 (r21 is most significant for little endian)
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; modifys:
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bigendian_sub32:
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sub r25, r21
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sbc r24, r20
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sbc r23, r19
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sbc r22, r18
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ret
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