94 строки
1.9 KiB
ArmAsm
94 строки
1.9 KiB
ArmAsm
/*
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* Copyright 2005-2009 Analog Devices Inc.
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*
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* Licensed under the ADI BSD license or the GPL-2 (or later)
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*/
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#include <linux/linkage.h>
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.align 2
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/*
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* C Library function MEMMOVE
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* R0 = To Address (leave unchanged to form result)
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* R1 = From Address
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* R2 = count
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* Data may overlap
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*/
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ENTRY(_memmove)
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I1 = P3;
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P0 = R0; /* P0 = To address */
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P3 = R1; /* P3 = From Address */
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P2 = R2; /* P2 = count */
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CC = P2 == 0; /* Check zero count*/
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IF CC JUMP .Lfinished; /* very unlikely */
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CC = R1 < R0 (IU); /* From < To */
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IF !CC JUMP .Lno_overlap;
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R3 = R1 + R2;
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CC = R0 <= R3 (IU); /* (From+len) >= To */
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IF CC JUMP .Loverlap;
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.Lno_overlap:
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R3 = 11;
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CC = R2 <= R3;
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IF CC JUMP .Lbytes;
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R3 = R1 | R0; /* OR addresses together */
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R3 <<= 30; /* check bottom two bits */
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CC = AZ; /* AZ set if zero.*/
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IF !CC JUMP .Lbytes; /* Jump if addrs not aligned.*/
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I0 = P3;
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P1 = P2 >> 2; /* count = n/4 */
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P1 += -1;
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R3 = 3;
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R2 = R2 & R3; /* remainder */
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P2 = R2; /* set remainder */
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R1 = [I0++];
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LSETUP (.Lquad_loops, .Lquad_loope) LC0=P1;
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#if ANOMALY_05000202
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.Lquad_loops:
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[P0++] = R1;
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.Lquad_loope:
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R1 = [I0++];
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#else
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.Lquad_loops:
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.Lquad_loope:
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MNOP || [P0++] = R1 || R1 = [I0++];
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#endif
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[P0++] = R1;
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CC = P2 == 0; /* any remaining bytes? */
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P3 = I0; /* Ammend P3 to updated ptr. */
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IF !CC JUMP .Lbytes;
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P3 = I1;
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RTS;
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.Lbytes: LSETUP (.Lbyte2_s, .Lbyte2_e) LC0=P2;
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.Lbyte2_s: R1 = B[P3++](Z);
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.Lbyte2_e: B[P0++] = R1;
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.Lfinished: P3 = I1;
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RTS;
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.Loverlap:
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P2 += -1;
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P0 = P0 + P2;
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P3 = P3 + P2;
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R1 = B[P3--] (Z);
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CC = P2 == 0;
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IF CC JUMP .Lno_loop;
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#if ANOMALY_05000245
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NOP;
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NOP;
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#endif
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LSETUP (.Lol_s, .Lol_e) LC0 = P2;
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.Lol_s: B[P0--] = R1;
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.Lol_e: R1 = B[P3--] (Z);
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.Lno_loop: B[P0] = R1;
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P3 = I1;
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RTS;
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ENDPROC(_memmove)
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