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Diffstat (limited to 'sysdeps/x86_64/strtok.S')
| -rw-r--r-- | sysdeps/x86_64/strtok.S | 208 |
1 files changed, 0 insertions, 208 deletions
diff --git a/sysdeps/x86_64/strtok.S b/sysdeps/x86_64/strtok.S deleted file mode 100644 index bd5b103d50..0000000000 --- a/sysdeps/x86_64/strtok.S +++ /dev/null @@ -1,208 +0,0 @@ -/* strtok (str, delim) -- Return next DELIM separated token from STR. - For AMD x86-64. - Copyright (C) 1998-2016 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Based on i686 version 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 the strtok and strtok_r functions: - - strtok: - INPUT PARAMETER: - str %rdi - delim %rsi - - strtok_r: - INPUT PARAMETER: - str %rdi - delim %rsi - save_ptr %rdx - - We do a common implementation here. */ - -#ifdef USE_AS_STRTOK_R -# define SAVE_PTR (%r9) -#else - .bss - .local save_ptr - .type save_ptr, @object - .size save_ptr, LP_SIZE -save_ptr: - .space LP_SIZE - -# ifdef PIC -# define SAVE_PTR save_ptr(%rip) -# else -# define SAVE_PTR save_ptr -# endif - -# define FUNCTION strtok -#endif - - .text -ENTRY (FUNCTION) - /* 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. */ - movq %rdi, %r8 /* Save value. */ - subq $256, %rsp /* Make space for 256 bytes. */ - cfi_adjust_cfa_offset(256) - movl $32, %ecx /* 32*8 bytes = 256 bytes. */ - movq %rsp, %rdi - xorl %eax, %eax /* We store 0s. */ - cld - rep - stosq - - /* Note: %rcx = 0 !!! */ - -#ifdef USE_AS_STRTOK_R - /* The value is stored in the third argument. */ - mov %RDX_LP, %R9_LP /* Save value - see def. of SAVE_PTR. */ - mov (%rdx), %RAX_LP -#else - /* The value is in the local variable defined above. But - we have to take care for PIC code. */ - mov SAVE_PTR, %RAX_LP -#endif - movq %r8, %rdx /* Get start of string. */ - - /* If the pointer is NULL we have to use the stored value of - the last run. */ - cmpq $0, %rdx - cmove %rax, %rdx - testq %rdx, %rdx - jz L(returnNULL) - movq %rsi, %rax /* Get start of delimiter set. */ - -/* For understanding the following code remember that %rcx == 0 now. - Although all the following instruction only modify %cl we always - have a correct zero-extended 64-bit value in %rcx. */ - -L(2): movb (%rax), %cl /* get byte from stopset */ - testb %cl, %cl /* is NUL char? */ - jz L(1) /* yes => start compare loop */ - movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */ - - movb 1(%rax), %cl /* get byte from stopset */ - testb $0xff, %cl /* is NUL char? */ - jz L(1) /* yes => start compare loop */ - movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */ - - movb 2(%rax), %cl /* get byte from stopset */ - testb $0xff, %cl /* is NUL char? */ - jz L(1) /* yes => start compare loop */ - movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */ - - movb 3(%rax), %cl /* get byte from stopset */ - addq $4, %rax /* increment stopset pointer */ - movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */ - testb $0xff, %cl /* is NUL char? */ - jnz L(2) /* no => process next dword from stopset */ - -L(1): - - leaq -4(%rdx), %rax /* 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): addq $4, %rax /* adjust pointer for full loop round */ - - movb (%rax), %cl /* get byte from string */ - testb %cl, (%rsp,%rcx) /* is it contained in stopset? */ - jz L(4) /* no => start of token */ - - movb 1(%rax), %cl /* get byte from string */ - testb %cl, (%rsp,%rcx) /* is it contained in stopset? */ - jz L(5) /* no => start of token */ - - movb 2(%rax), %cl /* get byte from string */ - testb %cl, (%rsp,%rcx) /* is it contained in stopset? */ - jz L(6) /* no => start of token */ - - movb 3(%rax), %cl /* get byte from string */ - testb %cl, (%rsp,%rcx) /* is it contained in stopset? */ - jnz L(3) /* yes => start of loop */ - - incq %rax /* adjust pointer */ -L(6): incq %rax -L(5): incq %rax - - /* Now we have to terminate the string. */ - -L(4): leaq -4(%rax), %rdx /* We use %rDX for the next run. */ - -L(7): addq $4, %rdx /* adjust pointer for full loop round */ - - movb (%rdx), %cl /* get byte from string */ - cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */ - je L(8) /* yes => return */ - - movb 1(%rdx), %cl /* get byte from string */ - cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */ - je L(9) /* yes => return */ - - movb 2(%rdx), %cl /* get byte from string */ - cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */ - je L(10) /* yes => return */ - - movb 3(%rdx), %cl /* get byte from string */ - cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */ - jne L(7) /* no => start loop again */ - - incq %rdx /* adjust pointer */ -L(10): incq %rdx -L(9): incq %rdx - -L(8): cmpq %rax, %rdx - je L(returnNULL) /* There was no token anymore. */ - - movb $0, (%rdx) /* Terminate string. */ - - /* Are we at end of string? */ - cmpb $0, %cl - leaq 1(%rdx), %rcx - cmovne %rcx, %rdx - - /* Store the pointer to the next character. */ - mov %RDX_LP, SAVE_PTR - -L(epilogue): - /* Remove the stopset table. */ - addq $256, %rsp - cfi_adjust_cfa_offset(-256) - retq - -L(returnNULL): - xorl %eax, %eax - /* Store the pointer to the next character. */ - mov %RDX_LP, SAVE_PTR - jmp L(epilogue) - -END (FUNCTION) |