diff options
Diffstat (limited to 'newlib/libc/machine/i960/strcpy_ca.S')
| -rw-r--r-- | newlib/libc/machine/i960/strcpy_ca.S | 284 |
1 files changed, 0 insertions, 284 deletions
diff --git a/newlib/libc/machine/i960/strcpy_ca.S b/newlib/libc/machine/i960/strcpy_ca.S deleted file mode 100644 index dbb9444..0000000 --- a/newlib/libc/machine/i960/strcpy_ca.S +++ /dev/null @@ -1,284 +0,0 @@ -/******************************************************************************* - * - * Copyright (c) 1993 Intel Corporation - * - * Intel hereby grants you permission to copy, modify, and distribute this - * software and its documentation. Intel grants this permission provided - * that the above copyright notice appears in all copies and that both the - * copyright notice and this permission notice appear in supporting - * documentation. In addition, Intel grants this permission provided that - * you prominently mark as "not part of the original" any modifications - * made to this software or documentation, and that the name of Intel - * Corporation not be used in advertising or publicity pertaining to - * distribution of the software or the documentation without specific, - * written prior permission. - * - * Intel Corporation provides this AS IS, WITHOUT ANY WARRANTY, EXPRESS OR - * IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY - * OR FITNESS FOR A PARTICULAR PURPOSE. Intel makes no guarantee or - * representations regarding the use of, or the results of the use of, - * the software and documentation in terms of correctness, accuracy, - * reliability, currentness, or otherwise; and you rely on the software, - * documentation and results solely at your own risk. - * - * IN NO EVENT SHALL INTEL BE LIABLE FOR ANY LOSS OF USE, LOSS OF BUSINESS, - * LOSS OF PROFITS, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES - * OF ANY KIND. IN NO EVENT SHALL INTEL'S TOTAL LIABILITY EXCEED THE SUM - * PAID TO INTEL FOR THE PRODUCT LICENSED HEREUNDER. - * - ******************************************************************************/ - - .file "strcp_ca.s" -#ifdef __PIC - .pic -#endif -#ifdef __PID - .pid -#endif -/* - * (c) copyright 1988,1993 Intel Corp., all rights reserved - */ - -/* - procedure strcpy (optimized assembler version for the CA) - - dest_addr = strcpy (dest_addr, src_addr) - - copy the null terminated string pointed to by src_addr to - the string space pointed to by dest_addr. Return the original - dest_addr. - - This routine will fail if the source and destination string - overlap (in particular, if the end of the source is overlapped - by the beginning of the destination). The behavior is undefined. - This is acceptable according to the draft C standard. - - Undefined behavior will also occur if the end of the source string - (i.e. the terminating null byte) is in the last word of the program's - allocated memory space. This is so because, in several cases, strcpy - will fetch ahead one word. Disallowing the fetch ahead would impose - a severe performance penalty. - - This program handles five cases: - - 1) both arguments start on a word boundary - 2) neither are word aligned, but they are offset by the same amount - 3) source is word aligned, destination is not - 4) destination is word aligned, source is not - 5) neither is word aligned, and they are offset by differing amounts - - At the time of this writing, only g0 thru g7 and g13 are available - for use in this leafproc; other registers would have to be saved and - restored. These nine registers, plus tricky use of g14 are sufficient - to implement the routine. The registers are used as follows: - - g0 original dest ptr; not modified, so that it may be returned. - g1 src ptr; shift count - g2 dest ptr; 4 bytes of src - g3 src ptr (word aligned) - g4 dest ptr (word aligned) - g5 0xff -- byte extraction mask - g6 lsw of double word for extraction of 4 bytes (little endian) - msw of double word for extraction of 4 bytes (big endian) - g7 msw of double word for extraction of 4 bytes (little endian) - lsw of double word for extraction of 4 bytes (big endian) - g13 return address - g14 byte extracted. When reaches null byte, which is zero, we will - be in conformance with register conventions, and can return to - the caller with a clear conscience. - - procedure strcat - - dest_addr = strcat (dest_addr, src_addr) - - Appends the string pointed to by src_addr to the string pointed - to by dest_addr. The first character of the source string is - copied to the location initially occupied by the trailing null - byte of the destination string. Thereafter, characters are copied - from the source to the destination up thru the null byte that - trails the source string. -*/ - -#if __i960_BIG_ENDIAN__ -#define MSW g6 -#define LSW g7 -#else -#define LSW g6 -#define MSW g7 -#endif - - .globl _strcpy, _strcat - .globl __strcpy, __strcat - .leafproc _strcpy, __strcpy - .leafproc _strcat, __strcat - .align 2 -_strcat: -#ifndef __PIC - lda Lrett,g14 -#else - lda Lrett-(.+8)(ip),g14 -#endif -__strcat: - notand g0,3,g4 # extract word addr of start of dest - lda (g14),g13 # preserve return address - and g0,3,LSW # extract byte offset of dest - ld (g4),MSW # fetch word containing at least first byte - shlo 3,LSW,g14 # get shift count for making mask for first word - subi 1,0,LSW # mask initially all ones -#if __i960_BIG_ENDIAN__ - shro g14,LSW,LSW # get mask for bytes needed from first word - lda 0xff000000,g5 # byte extraction mask -#else - shlo g14,LSW,LSW # get mask for bytes needed from first word - lda 0xff,g5 # byte extraction mask -#endif - notor MSW,LSW,MSW # set unneeded bytes to all ones -Lsearch_for_word_with_null: - scanbyte 0,MSW # check for null byte - lda 4(g4),g4 # post-increment dest word pointer - mov MSW,LSW # keep a copy of current word - ld (g4),MSW # fetch next word of dest - bno.t Lsearch_for_word_with_null # branch if null not found yet - and g5,LSW,g14 # extract byte - cmpo 0,g14 # branch if null is first byte of word - subo 4,g4,g4 # move dest word ptr back to word with null - notand g1,3,g3 # extract word addr of start of src - lda (g4),g2 # set dest byte ptr to 1st byte of word w/ null - be.f Lcase_14 -Lsearch_for_null: -#if __i960_BIG_ENDIAN__ - shro 8,g5,g5 # move mask down to next byte -#else - shlo 8,g5,g5 # move mask up to next byte -#endif - lda 1(g2),g2 # move dest byte ptr to next byte - and g5,LSW,g14 # extract byte - cmpobne.t 0,g14,Lsearch_for_null # branch if null is not yet found - lda 0xff,g5 # byte extraction mask - b Lcase_235.a - - -_strcpy: -#ifndef __PIC - lda Lrett,g14 -#else - lda Lrett-(.+8)(ip),g14 -#endif -__strcpy: - notand g0,3,g4 # extract word addr of start of dest - lda (g14),g13 # preserve return address - cmpo g0,g4 # check alignment of dest - lda 0xff,g5 # load mask for byte extraction - notand g1,3,g3 # extract word addr of start of src - bne.f Lcase_235 # branch if dest is NOT word aligned - -Lcase_14: - cmpo g3,g1 # check alignment of src - ld (g3),LSW # fetch word containing at least first byte - shlo 3,g1,g1 # compute shift count - lda 4(g3),g3 # advance src word addr -#if __i960_BIG_ENDIAN__ - lda 0xff,g5 # byte extraction mask -#endif - bne.f Lcase_4 # branch if src is NOT word aligned - -Lcase_1: # src and dest are word aligned - subo 4,g4,g4 # store is pre-incrementing; back up dest addr -Lcase_1_wloop: # word copying loop - scanbyte 0,LSW # check for null byte in src word - lda (LSW),g2 # keep a copy of the src word - addo 4,g4,g4 # pre-increment dest addr - ld (g3),LSW # pre-fetch next word of src - addo 4,g3,g3 # post-increment src addr - bo.f Lcase_1_cloop # branch if word contains null byte - st g2,(g4) # store word in dest string - b Lcase_1_wloop - -Lcase_3_cloop: -Lcase_1_cloop: # character copying loop -#if __i960_BIG_ENDIAN__ - rotate 8,g2,g2 # move next byte into position for extraction - and g5,g2,g14 # extract next char -#else - and g5,g2,g14 # extract next char - shro 8,g2,g2 # move next byte into position for extraction -#endif - cmpo 0,g14 # check for null byte - stob g14,(g4) # store the byte in dest - lda 1(g4),g4 # post-increment dest byte addr - bne.t Lcase_1_cloop # branch if null not reached - -Lexit_code: - bx (g13) # g0 = addr of dest; g14 = 0 -Lrett: - ret - -Lcase_3: # src is word aligned; dest is not - addo 4,g4,g4 # move dest word ptr to first word boundary - mov LSW,MSW # make copy of first word of src - lda 0,g1 # initialize shift count to zero - -Lcase_25: -Lcase_3_cloop_at_start: # character copying loop for start of dest str -#if __i960_BIG_ENDIAN__ - rotate 8,MSW,MSW # move next byte into position for extraction - and g5,MSW,g14 # extract next char -#else - and g5,MSW,g14 # extract next char - shro 8,MSW,MSW # move next byte into position for extraction -#endif - cmpo 0,g14 # check for null byte - stob g14,(g2) # store the byte in dest - lda 1(g2),g2 # post-increment dest ptr - be.f Lexit_code # branch if null byte reached - cmpo g2,g4 # have we reached word boundary in dest? - lda 8(g1),g1 # augment the shift counter - bne.t Lcase_3_cloop_at_start - -Lcase_4: - ld (g3),MSW # fetch msw of operand for double shift -#if __i960_BIG_ENDIAN__ - subo g1,0,g1 # Adjust shift count for big endian. -#endif - -Lcase_3_wloop: - eshro g1,g6,g2 # extract 4 bytes of src - lda 4(g3),g3 # post-increment src word addr - scanbyte 0,g2 # check for null byte - lda (MSW),LSW # move msw to lsw - ld (g3),MSW # pre-fetch msw of operand for double shift - bo.f Lcase_3_cloop # branch if word contains null byte - st g2,(g4) # store 4 bytes to dest - addo 4,g4,g4 # post-increment dest ptr - b Lcase_3_wloop - -Lcase_235: - lda (g0),g2 # copy dest ptr -Lcase_235.a: - cmpo g3,g1 # check alignment of src - ld (g3),LSW # fetch word containing at least first byte - and 3,g1,g14 # compute shift count - lda 4(g3),g3 # advance src word addr - shlo 3,g14,g1 - be.t Lcase_3 # branch if dest is word aligned - or g4,g14,g14 # is src earlier in word, later, or sync w/ dst - ld (g3),MSW # pre-fetch second half - cmpo g2,g14 # < indicates first word of dest has more bytes - lda 4(g4),g4 # move dest word addr to first word boundary - /* than first word of source. */ -#if __i960_BIG_ENDIAN__ - subo g1,0,g14 # Adjust shift count for big endian. - eshro g14,g6,g14 # extract four bytes - bge.f 1f -#else - eshro g1,g6,g14 # extract four bytes - bg.f 1f -#endif - mov MSW,LSW - lda 4(g3),g3 # move src word addr to second word boundary -1: - mov g14,MSW - b Lcase_25 - -/* end of strcpy */ - |