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Diffstat (limited to 'newlib/libc/machine/hppa/memcpy.S')
| -rw-r--r-- | newlib/libc/machine/hppa/memcpy.S | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/newlib/libc/machine/hppa/memcpy.S b/newlib/libc/machine/hppa/memcpy.S deleted file mode 100644 index 1fdc4ba..0000000 --- a/newlib/libc/machine/hppa/memcpy.S +++ /dev/null @@ -1,146 +0,0 @@ -/* - * (c) Copyright 1986 HEWLETT-PACKARD COMPANY - * - * To anyone who acknowledges that this file is provided "AS IS" - * without any express or implied warranty: - * permission to use, copy, modify, and distribute this file - * for any purpose is hereby granted without fee, provided that - * the above copyright notice and this notice appears in all - * copies, and that the name of Hewlett-Packard Company not be - * used in advertising or publicity pertaining to distribution - * of the software without specific, written prior permission. - * Hewlett-Packard Company makes no representations about the - * suitability of this software for any purpose. - */ - -/* HPUX_ID: @(#) $Revision: 1.1 $ */ -/* - * memcpy(s1, s2, n) - * - * Copy n characters from s2 to s1; returns s1. - */ - -#define d_addr arg0 -#define s_addr arg1 -#define count arg2 -#define tmp5 arg3 -#define tmp1 r19 -#define tmp2 r20 -#define tmp3 r21 -#define tmp4 r22 -#define tmp6 r31 - -#include "DEFS.h" - -ENTRY(memcpy) - comib,>= 5,count,byteloop /* If count is <= 6 don't get fancy.*/ - movb,=,n d_addr,ret0,done /* The return value is defined to be the value of d_addr. DELAY SLOT */ - /* if d_addr is null then exit */ - extru s_addr,31,2,tmp1 /* Extract the low two bits of the source address. */ - extru d_addr,31,2,tmp2 /* Extract the low two bits of the destination address. */ - add count,tmp2,count /* pre increment the count to adjust for alignment of s1 */ - comb,<> tmp2,tmp1,not_aligned /* see if s1 is aligned w.r.t. s2. */ - dep 0,31,2,s_addr /* Compute the word address of the source. DELAY SLOT. */ - -/* aligned */ - -/* We will now begin the 16 byte at a time word move if count >= 16 ! */ -/* Else we will branch to the 4 byte-at-a time word move ! */ - - addibt,<,n -16,count,chekchunk /* If count < 16 then we can't move 16 byte chunks ! */ - /* actually we can legally move 13 or more bytes on the first loop. */ - /* These loads and stores are done so as to prevent processor interlock. */ -chunks: - ldwm 16(0,s_addr),tmp1 /* tmp1 = *s_addr s_addr += 16 */ - ldw -12(0,s_addr),tmp2 /* tmp2 = 2nd word */ - ldw -8(0,s_addr),tmp3 /* tmp3 = 3rd word */ - ldw -4(0,s_addr),tmp4 /* tmp4 = 4th word */ - /* Now store the results ! */ - stbys,b,m tmp1,4(0,d_addr) /* tmp1 = 1st word stored d_addr += 16 also take care of front porch. */ - stwm tmp2,4(0,d_addr) /* tmp2 = 2nd word stored. */ - stwm tmp3,4(0,d_addr) /* tmp3 = 3rd word stored. */ - addibf,< -16,count,chunks /* If count is still >= 16 do another loop. */ - stwm tmp4,4(0,d_addr) /* tmp4 = 4th word stored. DELAY SLOT */ - -chekchunk: - addibt,<,n 12,count,back_porch /* since the count is already decremented by -16 we're testing */ - /* to see if there are at least 4 bytes left ? */ -subchunk: - ldws,ma 4(s_addr),tmp1 /* tmp1 = *s_addr++ */ - addibf,< -4,count,subchunk /* count -= 4 */ - stbys,b,m tmp1,4(d_addr) /* *d_addr++ = tmp1 */ - - -back_porch: - addibt,=,n 4,count,done /* if count = 0 we're, of course, done ! */ - ldws 0(s_addr),tmp1 /* load up the back_porch */ - add d_addr,count,d_addr/* final store address is +1 too high ! */ - bv 0(r2) /* return--were done. */ - stbys,e tmp1,0(d_addr) /* kerplunk! whew ! */ - -/* Begin non_aligned code. (no refrence to politics) */ -not_aligned: - sub,>= tmp2,tmp1,tmp3 /* compute the shift quantity again and skip the load if tmp2 > tmp1. */ - ldwm 4(0,s_addr),tmp1 /* load up the first word from the source. tmp1 = *s_addr++ */ - zdep tmp3,28,29,tmp4 /* compute the number of bits to shift based on the number of bytes above. */ - mtctl tmp4,11 /* load the shift count into cr11 = shift count register. */ - - addibt,<,n -16,count,chkchnk2 /* first step in pre adjustment of count for looping. */ - -chunk2: - ldwm 16(0,s_addr),tmp2 /* get either first or second word . tmp2 = *s_addr++ */ - ldw -12(s_addr),tmp3 - ldw -8(s_addr),tmp4 - ldw -4(s_addr),tmp5 - vshd tmp1,tmp2,tmp6 /* position data ! */ - stbys,b,m tmp6,4(0,d_addr) /* store ! */ - - vshd tmp2,tmp3,tmp6 /* position data ! */ - stwm tmp6,4(0,d_addr) /* store ! */ - - vshd tmp3,tmp4,tmp6 /* position data ! */ - stwm tmp6,4(0,d_addr) /* store ! */ - - vshd tmp4,tmp5,tmp6 /* position data ! */ - stwm tmp6,4(0,d_addr) /* store the data ! */ - addibf,< -16,count,chunk2 /* If count is still >= 16 do another loop. */ - copy tmp5,tmp1 - - -chkchnk2: - addibt,<,n 12,count,bp_0 /* if we don't have 4 bytes left then do the back porch (bp_0) */ - -subchnk2: - ldwm 4(0,s_addr),tmp2 /* get next word ! */ - vshd tmp1,tmp2,tmp3 /* position data ! */ - addibt,< -4,count,bp_1 /* decrement count and when count < 4 goto back_porch (bp_1) */ - stbys,b,m tmp3,4(0,d_addr) /* store ! */ - - ldwm 4(0,s_addr),tmp1 /* get 4th word ! */ - vshd tmp2,tmp1,tmp3 /* position data ! */ - addib,>= -4,count,subchnk2 /* decrement count and when count <= 4 go to back porch (bp_2) */ - stbys,b,m tmp3,4(0,d_addr) /* store the data ! */ - -bp_0: copy tmp1,tmp2 /* switch registers used in the shift process. */ -bp_1: addibt,<=,n 4,count,done /* if count = -4 this implies that count = 0 -> done */ - add d_addr,count,d_addr /* bump destination address to be +1 too high ! */ - mfctl sar,tmp3 /* suppress final ldwm unless result used */ - extru tmp3,28,2,tmp3 /* convert bitshift to byteshift */ - sub,<= count,tmp3,r0 /* bytes unused if (count-byteshift <= 0*/ - - ldwm 4(0,s_addr),tmp1 /* get final word ! */ - vshd tmp2,tmp1,tmp3 /* position data ! */ - bv 0(r2) /* return */ - stbys,e tmp3,0(0,d_addr) /* store the data ! */ - -/* here we do ye old byte-at-a-time moves. */ -byteloop: - comb,>=,n 0,count,done - -encore: - ldbs,ma 1(s_addr),tmp1 - addibf,= -1,count,encore - stbs,ma tmp1,1(d_addr) - -done: -EXIT(memcpy) |