mirror of
https://github.com/sheumann/65816-crypto.git
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82 lines
1.3 KiB
Plaintext
82 lines
1.3 KiB
Plaintext
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* Right-rotate 32-bit value in &loc (DP or 16-bit address) by &n positions
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macro
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ROTR4 &loc,&n
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aif &n>16,.dorotl
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lda &loc+2
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lcla &i
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&i seta &n
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.rotrloop
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lsr a ;to set carry
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ror &loc
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ror &loc+2
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&i seta &i-1
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aif &i>0,.rotrloop
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ago .end
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.dorotl
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ROTL4 &loc,32-&n
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.end
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mend
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* Left-rotate 32-bit value in &loc (DP or 16-bit address) by &n positions
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macro
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ROTL4 &loc,&n
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aif &n>16,.dorotr
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lda &loc
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lcla &i
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&i seta &n
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.rotlloop
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asl a ;to set carry
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rol &loc+2
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rol &loc
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&i seta &i-1
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aif &i>0,.rotlloop
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ago .end
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.dorotr
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ROTR4 &loc,32-&n
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.end
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mend
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* &to := &from ROTR4 &n
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macro
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ROTR4MOVE &to,&from,&n
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aif &n>16,.dorotl
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lda &from
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sta &to
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lda &from+2
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sta &to+2
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lcla &i
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&i seta &n
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.rotrloop
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lsr a ;to set carry
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ror &to
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ror &to+2
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&i seta &i-1
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aif &i>0,.rotrloop
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ago .end
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dorotl
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ROTL4MOVE &to,&from,32-&n
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.end
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mend
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* &to := &from ROTL4 &n
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macro
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ROTL4MOVE &to,&from,&n
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aif &n>16,.dorotr
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lda &from+2
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sta &to+2
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lda &from
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sta &to
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lcla &i
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&i seta &n
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.rotlloop
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asl a ;to set carry
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rol &to+2
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rol &to
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&i seta &i-1
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aif &i>0,.rotlloop
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ago .end
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.dorotr
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ROTR4MOVE &to,&from,32-&n
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.end
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mend
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