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2ed5fd9a2a
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.
319 lines
7.9 KiB
ArmAsm
319 lines
7.9 KiB
ArmAsm
/* strtok (str, delim) -- Return next DELIM separated token from STR.
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For Intel 80x86, x>=3.
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Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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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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#include <sysdep.h>
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#include "asm-syntax.h"
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#include "bp-sym.h"
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#include "bp-asm.h"
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/* This file can be used for three variants of the strtok function:
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strtok:
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INPUT PARAMETER:
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str (sp + 4)
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delim (sp + 8)
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strtok_r:
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INPUT PARAMETER:
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str (sp + 4)
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delim (sp + 8)
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save_ptr (sp + 12)
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We do a common implementation here. */
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#ifdef USE_AS_STRTOK_R
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# define SAVE_PTR 0(%ecx)
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#else
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.bss
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.local save_ptr
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ASM_TYPE_DIRECTIVE (save_ptr, @object)
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.size save_ptr, 4
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save_ptr:
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# if __BOUNDED_POINTERS__
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.space 12
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# else
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.space 4
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# endif
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# ifdef PIC
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# define SAVE_PTR save_ptr@GOTOFF(%ebx)
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# else
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# define SAVE_PTR save_ptr
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# endif
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# define FUNCTION strtok
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#endif
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#define PARMS LINKAGE /* no space for saved regs */
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#define RTN PARMS
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#define STR RTN+RTN_SIZE
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#define DELIM STR+PTR_SIZE
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#define SAVE DELIM+PTR_SIZE
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.text
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ENTRY (BP_SYM (FUNCTION))
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ENTER
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movl STR(%esp), %edx
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movl DELIM(%esp), %eax
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CHECK_BOUNDS_LOW (%eax, DELIM(%esp))
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#if !defined USE_AS_STRTOK_R && defined PIC
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pushl %ebx /* Save PIC register. */
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call L(here)
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L(here):
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popl %ebx
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addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ebx
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#endif
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/* If the pointer is NULL we have to use the stored value of
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the last run. */
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cmpl $0, %edx
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#if __BOUNDED_POINTERS__
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movl SAVE(%esp), %ecx
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je L(0)
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/* Save bounds of incoming non-NULL STR into save area. */
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movl 4+STR(%esp), %eax
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movl %eax, 4+SAVE_PTR
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movl 8+STR(%esp), %eax
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movl %eax, 8+SAVE_PTR
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CHECK_BOUNDS_LOW (%edx, SAVE_PTR)
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jmp L(1)
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L(0): movl SAVE_PTR, %edx
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CHECK_BOUNDS_LOW (%edx, SAVE_PTR)
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jmp L(1)
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#else
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jne L(1)
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#endif
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#ifdef USE_AS_STRTOK_R
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/* The value is stored in the third argument. */
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movl SAVE(%esp), %edx
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movl (%edx), %edx
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#else
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/* The value is in the local variable defined above. But
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we have to take care for PIC code. */
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movl SAVE_PTR, %edx
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#endif
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L(1):
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/* First we create a table with flags for all possible characters.
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For the ASCII (7bit/8bit) or ISO-8859-X character sets which are
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supported by the C string functions we have 256 characters.
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Before inserting marks for the stop characters we clear the whole
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table. The unrolled form is much faster than a loop. */
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xorl %ecx, %ecx /* %ecx = 0 !!! */
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pushl %ecx /* make a 256 bytes long block filled with 0 */
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl %ecx
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pushl $0 /* These immediate values make the label 2 */
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pushl $0 /* to be aligned on a 16 byte boundary to */
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pushl $0 /* get a better performance of the loop. */
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pushl $0
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pushl $0
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pushl $0
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/* For understanding the following code remember that %ecx == 0 now.
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Although all the following instruction only modify %cl we always
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have a correct zero-extended 32-bit value in %ecx. */
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L(2): movb (%eax), %cl /* get byte from stopset */
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testb %cl, %cl /* is NUL char? */
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jz L(1_1) /* yes => start compare loop */
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movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */
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movb 1(%eax), %cl /* get byte from stopset */
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testb $0xff, %cl /* is NUL char? */
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jz L(1_2) /* yes => start compare loop */
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movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */
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movb 2(%eax), %cl /* get byte from stopset */
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testb $0xff, %cl /* is NUL char? */
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jz L(1_3) /* yes => start compare loop */
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movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */
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movb 3(%eax), %cl /* get byte from stopset */
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addl $4, %eax /* increment stopset pointer */
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movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */
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testb $0xff, %cl /* is NUL char? */
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jnz L(2) /* no => process next dword from stopset */
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#if __BOUNDED_POINTERS__
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jmp L(1_0) /* pointer is correct for bounds check */
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L(1_3): incl %eax /* adjust pointer for bounds check */
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L(1_2): incl %eax /* ditto */
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L(1_1): incl %eax /* ditto */
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L(1_0): CHECK_BOUNDS_HIGH (%eax, DELIM(%esp), jbe)
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#else
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L(1_3):; L(1_2):; L(1_1): /* fall through */
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#endif
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leal -4(%edx), %eax /* prepare loop */
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/* We use a neat trick for the following loop. Normally we would
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have to test for two termination conditions
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1. a character in the stopset was found
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and
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2. the end of the string was found
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As a sign that the character is in the stopset we store its
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value in the table. The value of NUL is NUL so the loop
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terminates for NUL in every case. */
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L(3): addl $4, %eax /* adjust pointer for full loop round */
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movb (%eax), %cl /* get byte from string */
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testb %cl, (%esp,%ecx) /* is it contained in stopset? */
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jz L(4) /* no => start of token */
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movb 1(%eax), %cl /* get byte from string */
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testb %cl, (%esp,%ecx) /* is it contained in stopset? */
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jz L(5) /* no => start of token */
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movb 2(%eax), %cl /* get byte from string */
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testb %cl, (%esp,%ecx) /* is it contained in stopset? */
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jz L(6) /* no => start of token */
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movb 3(%eax), %cl /* get byte from string */
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testb %cl, (%esp,%ecx) /* is it contained in stopset? */
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jnz L(3) /* yes => start of loop */
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incl %eax /* adjust pointer */
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L(6): incl %eax
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L(5): incl %eax
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/* Now we have to terminate the string. */
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L(4): leal -4(%eax), %edx /* We use %EDX for the next run. */
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L(7): addl $4, %edx /* adjust pointer for full loop round */
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movb (%edx), %cl /* get byte from string */
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cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */
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je L(8) /* yes => return */
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movb 1(%edx), %cl /* get byte from string */
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cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */
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je L(9) /* yes => return */
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movb 2(%edx), %cl /* get byte from string */
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cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */
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je L(10) /* yes => return */
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movb 3(%edx), %cl /* get byte from string */
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cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */
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jne L(7) /* no => start loop again */
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incl %edx /* adjust pointer */
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L(10): incl %edx
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L(9): incl %edx
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L(8): /* Remove the stopset table. */
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addl $256, %esp
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cmpl %eax, %edx
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je L(returnNULL) /* There was no token anymore. */
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movb $0, (%edx) /* Terminate string. */
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/* Are we at end of string? */
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cmpb $0, %cl
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je L(11)
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incl %edx
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L(11):
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/* Store the pointer to the next character. */
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#ifdef USE_AS_STRTOK_R
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movl SAVE(%esp), %ecx
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#endif
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movl %edx, SAVE_PTR
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CHECK_BOUNDS_HIGH (%edx, SAVE_PTR, jb)
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RETURN_BOUNDED_POINTER (SAVE_PTR)
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L(epilogue):
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#if !defined USE_AS_STRTOK_R && defined PIC
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popl %ebx
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#endif
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LEAVE
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RET_PTR
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L(returnNULL):
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xorl %eax, %eax
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RETURN_NULL_BOUNDED_POINTER
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jmp L(epilogue)
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END (BP_SYM (FUNCTION))
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