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