summaryrefslogtreecommitdiff
path: root/arch/cris/arch-v32/lib/string.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/cris/arch-v32/lib/string.c')
-rw-r--r--arch/cris/arch-v32/lib/string.c236
1 files changed, 0 insertions, 236 deletions
diff --git a/arch/cris/arch-v32/lib/string.c b/arch/cris/arch-v32/lib/string.c
deleted file mode 100644
index c7bd6ebdc93c..000000000000
--- a/arch/cris/arch-v32/lib/string.c
+++ /dev/null
@@ -1,236 +0,0 @@
-/* A memcpy for CRIS.
- Copyright (C) 1994-2005 Axis Communications.
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. Neither the name of Axis Communications nor the names of its
- contributors may be used to endorse or promote products derived
- from this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY AXIS COMMUNICATIONS AND ITS CONTRIBUTORS
- ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AXIS
- COMMUNICATIONS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
- IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGE. */
-
-/* FIXME: This file should really only be used for reference, as the
- result is somewhat depending on gcc generating what we expect rather
- than what we describe. An assembly file should be used instead. */
-
-#include <stddef.h>
-
-/* Break even between movem and move16 is really at 38.7 * 2, but
- modulo 44, so up to the next multiple of 44, we use ordinary code. */
-#define MEMCPY_BY_BLOCK_THRESHOLD (44 * 2)
-
-/* No name ambiguities in this file. */
-__asm__ (".syntax no_register_prefix");
-
-void *
-memcpy(void *pdst, const void *psrc, size_t pn)
-{
- /* Now we want the parameters put in special registers.
- Make sure the compiler is able to make something useful of this.
- As it is now: r10 -> r13; r11 -> r11 (nop); r12 -> r12 (nop).
-
- If gcc was allright, it really would need no temporaries, and no
- stack space to save stuff on. */
-
- register void *return_dst __asm__ ("r10") = pdst;
- register unsigned char *dst __asm__ ("r13") = pdst;
- register unsigned const char *src __asm__ ("r11") = psrc;
- register int n __asm__ ("r12") = pn;
-
- /* When src is aligned but not dst, this makes a few extra needless
- cycles. I believe it would take as many to check that the
- re-alignment was unnecessary. */
- if (((unsigned long) dst & 3) != 0
- /* Don't align if we wouldn't copy more than a few bytes; so we
- don't have to check further for overflows. */
- && n >= 3)
- {
- if ((unsigned long) dst & 1)
- {
- n--;
- *dst = *src;
- src++;
- dst++;
- }
-
- if ((unsigned long) dst & 2)
- {
- n -= 2;
- *(short *) dst = *(short *) src;
- src += 2;
- dst += 2;
- }
- }
-
- /* Decide which copying method to use. */
- if (n >= MEMCPY_BY_BLOCK_THRESHOLD)
- {
- /* It is not optimal to tell the compiler about clobbering any
- registers; that will move the saving/restoring of those registers
- to the function prologue/epilogue, and make non-movem sizes
- suboptimal. */
- __asm__ volatile
- ("\
- ;; GCC does promise correct register allocations, but let's \n\
- ;; make sure it keeps its promises. \n\
- .ifnc %0-%1-%2,$r13-$r11-$r12 \n\
- .error \"GCC reg alloc bug: %0-%1-%4 != $r13-$r12-$r11\" \n\
- .endif \n\
- \n\
- ;; Save the registers we'll use in the movem process \n\
- ;; on the stack. \n\
- subq 11*4,sp \n\
- movem r10,[sp] \n\
- \n\
- ;; Now we've got this: \n\
- ;; r11 - src \n\
- ;; r13 - dst \n\
- ;; r12 - n \n\
- \n\
- ;; Update n for the first loop. \n\
- subq 44,r12 \n\
-0: \n\
-"
-#ifdef __arch_common_v10_v32
- /* Cater to branch offset difference between v32 and v10. We
- assume the branch below has an 8-bit offset. */
-" setf\n"
-#endif
-" movem [r11+],r10 \n\
- subq 44,r12 \n\
- bge 0b \n\
- movem r10,[r13+] \n\
- \n\
- ;; Compensate for last loop underflowing n. \n\
- addq 44,r12 \n\
- \n\
- ;; Restore registers from stack. \n\
- movem [sp+],r10"
-
- /* Outputs. */
- : "=r" (dst), "=r" (src), "=r" (n)
-
- /* Inputs. */
- : "0" (dst), "1" (src), "2" (n));
- }
-
- while (n >= 16)
- {
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
-
- n -= 16;
- }
-
- switch (n)
- {
- case 0:
- break;
-
- case 1:
- *dst = *src;
- break;
-
- case 2:
- *(short *) dst = *(short *) src;
- break;
-
- case 3:
- *(short *) dst = *(short *) src; dst += 2; src += 2;
- *dst = *src;
- break;
-
- case 4:
- *(long *) dst = *(long *) src;
- break;
-
- case 5:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *dst = *src;
- break;
-
- case 6:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(short *) dst = *(short *) src;
- break;
-
- case 7:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(short *) dst = *(short *) src; dst += 2; src += 2;
- *dst = *src;
- break;
-
- case 8:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src;
- break;
-
- case 9:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *dst = *src;
- break;
-
- case 10:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(short *) dst = *(short *) src;
- break;
-
- case 11:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(short *) dst = *(short *) src; dst += 2; src += 2;
- *dst = *src;
- break;
-
- case 12:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src;
- break;
-
- case 13:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *dst = *src;
- break;
-
- case 14:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(short *) dst = *(short *) src;
- break;
-
- case 15:
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(long *) dst = *(long *) src; dst += 4; src += 4;
- *(short *) dst = *(short *) src; dst += 2; src += 2;
- *dst = *src;
- break;
- }
-
- return return_dst;
-}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-22 11:58:10 +0300