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Diffstat (limited to 'sysdeps/i386/i686/strtok.S')
| -rw-r--r-- | sysdeps/i386/i686/strtok.S | 244 |
1 files changed, 0 insertions, 244 deletions
diff --git a/sysdeps/i386/i686/strtok.S b/sysdeps/i386/i686/strtok.S deleted file mode 100644 index 90b2fd6301..0000000000 --- a/sysdeps/i386/i686/strtok.S +++ /dev/null @@ -1,244 +0,0 @@ -/* strtok (str, delim) -- Return next DELIM separated token from STR. - For Intel 80686. - Copyright (C) 1998-2016 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <sysdep.h> -#include "asm-syntax.h" - -/* This file can be used for three variants of the strtok function: - - strtok: - INPUT PARAMETER: - str (sp + 4) - delim (sp + 8) - - strtok_r: - INPUT PARAMETER: - str (sp + 4) - delim (sp + 8) - save_ptr (sp + 12) - - We do a common implementation here. */ - -#ifdef USE_AS_STRTOK_R -# define SAVE_PTR 0(%ecx) -#else - .bss - .local save_ptr - .type save_ptr, @object - .size save_ptr, 4 -save_ptr: - .space 4 - -# ifdef PIC -# define SAVE_PTR save_ptr@GOTOFF(%ebx) -# else -# define SAVE_PTR save_ptr -# endif - -# define FUNCTION strtok -#endif - -#if !defined USE_AS_STRTOK_R && defined PIC -# define PARMS 4+256+4 /* space for table and saved PIC register */ -#else -# define PARMS 4+256 /* space for table */ -#endif -#define RTN PARMS -#define STR RTN -#define DELIM STR+4 -#ifdef USE_AS_STRTOK_R -# define SAVE DELIM+4 -#endif - - .text - -#if !defined USE_AS_STRTOK_R && defined PIC -0: movl (%esp), %ebx - ret -#endif - -ENTRY (FUNCTION) - -#if !defined USE_AS_STRTOK_R && defined PIC - pushl %ebx /* Save PIC register. */ - cfi_adjust_cfa_offset (4) - cfi_rel_offset (ebx, 0) - call 0b - addl $_GLOBAL_OFFSET_TABLE_, %ebx -#endif - - /* First we create a table with flags for all possible characters. - For the ASCII (7bit/8bit) or ISO-8859-X character sets which are - supported by the C string functions we have 256 characters. - Before inserting marks for the stop characters we clear the whole - table. */ - movl %edi, %edx - subl $256, %esp - cfi_adjust_cfa_offset (256) - movl $64, %ecx - movl %esp, %edi - xorl %eax, %eax - cld - rep - stosl - - /* Note: %ecx = 0 !!! */ - movl %edx, %edi - - movl STR(%esp), %edx /* Get start of string. */ - -#ifdef USE_AS_STRTOK_R - /* The value is stored in the third argument. */ - movl SAVE(%esp), %eax - movl (%eax), %eax -#else - /* The value is in the local variable defined above. But - we have to take care for PIC code. */ - movl SAVE_PTR, %eax -#endif - - /* If the pointer is NULL we have to use the stored value of - the last run. */ - cmpl $0, %edx - cmove %eax, %edx - testl %edx, %edx - jz L(returnNULL) - movl DELIM(%esp), %eax /* Get start of delimiter set. */ - -/* For understanding the following code remember that %ecx == 0 now. - Although all the following instruction only modify %cl we always - have a correct zero-extended 32-bit value in %ecx. */ - -L(2): movb (%eax), %cl /* get byte from stopset */ - testb %cl, %cl /* is NUL char? */ - jz L(1) /* yes => start compare loop */ - movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */ - - movb 1(%eax), %cl /* get byte from stopset */ - testb $0xff, %cl /* is NUL char? */ - jz L(1) /* yes => start compare loop */ - movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */ - - movb 2(%eax), %cl /* get byte from stopset */ - testb $0xff, %cl /* is NUL char? */ - jz L(1) /* yes => start compare loop */ - movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */ - - movb 3(%eax), %cl /* get byte from stopset */ - addl $4, %eax /* increment stopset pointer */ - movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */ - testb $0xff, %cl /* is NUL char? */ - jnz L(2) /* no => process next dword from stopset */ - -L(1): leal -4(%edx), %eax /* prepare loop */ - - /* We use a neat trick for the following loop. Normally we would - have to test for two termination conditions - 1. a character in the stopset was found - and - 2. the end of the string was found - As a sign that the character is in the stopset we store its - value in the table. The value of NUL is NUL so the loop - terminates for NUL in every case. */ - -L(3): addl $4, %eax /* adjust pointer for full loop round */ - - movb (%eax), %cl /* get byte from string */ - testb %cl, (%esp,%ecx) /* is it contained in stopset? */ - jz L(4) /* no => start of token */ - - movb 1(%eax), %cl /* get byte from string */ - testb %cl, (%esp,%ecx) /* is it contained in stopset? */ - jz L(5) /* no => start of token */ - - movb 2(%eax), %cl /* get byte from string */ - testb %cl, (%esp,%ecx) /* is it contained in stopset? */ - jz L(6) /* no => start of token */ - - movb 3(%eax), %cl /* get byte from string */ - testb %cl, (%esp,%ecx) /* is it contained in stopset? */ - jnz L(3) /* yes => start of loop */ - - incl %eax /* adjust pointer */ -L(6): incl %eax -L(5): incl %eax - - /* Now we have to terminate the string. */ - -L(4): leal -4(%eax), %edx /* We use %EDX for the next run. */ - -L(7): addl $4, %edx /* adjust pointer for full loop round */ - - movb (%edx), %cl /* get byte from string */ - cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */ - je L(8) /* yes => return */ - - movb 1(%edx), %cl /* get byte from string */ - cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */ - je L(9) /* yes => return */ - - movb 2(%edx), %cl /* get byte from string */ - cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */ - je L(10) /* yes => return */ - - movb 3(%edx), %cl /* get byte from string */ - cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */ - jne L(7) /* no => start loop again */ - - incl %edx /* adjust pointer */ -L(10): incl %edx -L(9): incl %edx - -L(8): cmpl %eax, %edx - je L(returnNULL) /* There was no token anymore. */ - - movb $0, (%edx) /* Terminate string. */ - - /* Are we at end of string? */ - cmpb $0, %cl - leal 1(%edx), %ecx - cmovne %ecx, %edx - - /* Store the pointer to the next character. */ -#ifdef USE_AS_STRTOK_R - movl SAVE(%esp), %ecx -#endif - movl %edx, SAVE_PTR - -L(epilogue): - /* Remove the stopset table. */ - addl $256, %esp - cfi_adjust_cfa_offset (-256) -#if !defined USE_AS_STRTOK_R && defined PIC - popl %ebx - cfi_adjust_cfa_offset (-4) - cfi_restore (ebx) -#endif - ret - -L(returnNULL): - xorl %eax, %eax -#ifdef USE_AS_STRTOK_R - movl SAVE(%esp), %ecx -#endif - movl %edx, SAVE_PTR - jmp L(epilogue) - -END (FUNCTION) |