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2000-07-26 Greg McGary <greg@mcgary.org> * Makeconfig (+link-bounded, link-libc-bounded, link-extra-libs-bounded): New variables. (built-program-cmd): Omit $(run-program-prefix) for static BP tests. * Makerules (do-tests-clean, common-mostlyclean): Remove BP test files. * Rules (tests-bp.out): New variable. (tests): Conditionally add BP tests. (binaries-bounded): Add variable and associated rule. * csu/Makefile [build-bounded] (extra-objs, install-lib): Move conditional stuff after place where condition is defined. * malloc/malloc.c (bp-checks.h): Add #include. (mem2chunk, chunk_at_offset, bin_at): Wrap BOUNDED_1 around expression. (_bin_at): Add unbounded version of bin_at. (IAV, chunk_alloc): Use unbounded _bin_at. (mALLOc, rEALLOc, chunk_realloc, mEMALIGn, cALLOc, chunk2mem_check, realloc_check, malloc_starter, malloc_atfork): Wrap BOUNDED_N around return value. (chunk_realloc): Adjust oldsize once. * sysdeps/generic/bp-checks.h (__memchr): Remove incorrect decl. (__ubp_memchr): Add correct decl. (_CHECK_STRING): Use __ubp_memchr. * sysdeps/alpha/memchr.S [!__BOUNDED_POINTERS__] (__ubp_memchr): New alias for unbounded-pointer __memchr. * sysdeps/i386/memchr.S: Likewise. * sysdeps/ia64/memchr.S: Likewise. * sysdeps/m68k/memchr.S: Likewise. * sysdeps/sparc/sparc32/memchr.S: Likewise. * sysdeps/sparc/sparc64/memchr.S: Likewise. * sysdeps/vax/memchr.s: Likewise. * sysdeps/i386/strtok.S: Fix bounds checks to pass tests. (SAVE_PTR): New macro. (save_ptr): Expand size as BP. (strtok): Don't bother to write into SAVE_PTR when returning NULL. * sysdeps/i386/i686/strtok.S: Likewise. * sysdeps/i386/bp-asm.h (RETURN_BOUNDED_POINTER, RETURN_NULL_BOUNDED_POINTER): Use %ecx as the scratch register. * sysdeps/i386/bits/string.h [!__BOUNDED_POINTERS__]: Disable inlines. * sysdeps/i386/i486/bits/string.h [!__BOUNDED_POINTERS__]: Likewise. * sysdeps/unix/sysv/linux/getsysstats.c (get_proc_path): Copy bounds of copy_result to mount_proc.
130 lines
4.0 KiB
ArmAsm
130 lines
4.0 KiB
ArmAsm
/* Optimized version of the standard memchr() function.
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This file is part of the GNU C Library.
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Copyright (C) 2000 Free Software Foundation, Inc.
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Contributed by Dan Pop <Dan.Pop@cern.ch>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Return: the address of the first occurence of chr in str or NULL
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Inputs:
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in0: str
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in1: chr
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in2: byte count
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This implementation assumes little endian mode. For big endian mode,
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the instruction czx1.r should be replaced by czx1.l.
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The algorithm is fairly straightforward: search byte by byte until we
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we get to a word aligned address, then search word by word as much as
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possible; the remaining few bytes are searched one at a time.
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The word by word search is performed by xor-ing the word with a word
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containing chr in every byte. If there is a hit, the result will
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contain a zero byte in the corresponding position. The presence and
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position of that zero byte is detected with a czx instruction.
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All the loops in this function could have had the internal branch removed
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if br.ctop and br.cloop could be predicated :-(. */
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#include <sysdep.h>
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#undef ret
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#define saved_pfs r14
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#define saved_pr r15
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#define saved_lc r16
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#define chr r17
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#define len r18
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#define pos0 r20
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#define val r21
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#define tmp r24
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#define chrx8 r25
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#define loopcnt r30
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#define str in0
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ENTRY(__memchr)
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alloc saved_pfs = ar.pfs, 3, 0, 29, 32
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#include "softpipe.h"
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.rotr value[MEMLAT+1], addr[MEMLAT+3], aux[2], poschr[2]
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.rotp p[MEMLAT+3]
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mov saved_lc = ar.lc // save the loop counter
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mov saved_pr = pr // save the predicates
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mov ret0 = str
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and tmp = 7, str // tmp = str % 8
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cmp.ne p7, p0 = r0, r0 // clear p7
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extr.u chr = in1, 0, 8 // chr = (unsigned char) in1
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mov len = in2
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cmp.gtu p6, p0 = 16, in2 // use a simple loop for short
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(p6) br.cond.spnt .srchfew ;; // searches
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sub loopcnt = 8, tmp // loopcnt = 8 - tmp
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cmp.eq p6, p0 = tmp, r0
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(p6) br.cond.sptk .str_aligned;;
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sub len = len, loopcnt
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adds loopcnt = -1, loopcnt;;
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mov ar.lc = loopcnt
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.l1:
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ld1 val = [ret0], 1
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;;
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cmp.eq p6, p0 = val, chr
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(p6) br.cond.spnt .foundit
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br.cloop.sptk .l1 ;;
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.str_aligned:
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cmp.ne p6, p0 = r0, r0 // clear p6
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shr.u loopcnt = len, 3 // loopcnt = len / 8
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and len = 7, len ;; // remaining len = len & 7
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adds loopcnt = -1, loopcnt
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mov ar.ec = MEMLAT + 3
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mux1 chrx8 = chr, @brcst ;; // get a word full of chr
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mov ar.lc = loopcnt
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mov pr.rot = 1 << 16 ;;
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.l2:
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(p[0]) mov addr[0] = ret0
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(p[0]) ld8 value[0] = [ret0], 8
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(p[MEMLAT]) xor aux[0] = value[MEMLAT], chrx8
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(p[MEMLAT+1]) czx1.r poschr[0] = aux[1]
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(p[MEMLAT+2]) cmp.ne p7, p0 = 8, poschr[1]
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(p7) br.cond.dpnt .foundit
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br.ctop.dptk .l2
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.srchfew:
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adds loopcnt = -1, len
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cmp.eq p6, p0 = len, r0
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(p6) br.cond.spnt .notfound ;;
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mov ar.lc = loopcnt
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.l3:
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ld1 val = [ret0], 1
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;;
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cmp.eq p6, p0 = val, chr
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(p6) br.cond.dpnt .foundit
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br.cloop.sptk .l3 ;;
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.notfound:
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cmp.ne p6, p0 = r0, r0 // clear p6 (p7 was already 0 when we got here)
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mov ret0 = r0 ;; // return NULL
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.foundit:
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(p6) adds ret0 = -1, ret0 // if we got here from l1 or l3
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(p7) add ret0 = addr[MEMLAT+2], poschr[1] // if we got here from l2
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mov pr = saved_pr, -1
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mov ar.pfs = saved_pfs
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mov ar.lc = saved_lc
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br.ret.sptk.many b0
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END(__memchr)
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weak_alias (__memchr, memchr)
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#if !__BOUNDED_POINTERS__
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weak_alias (__memchr, __ubp_memchr)
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#endif
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