mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
bc795d0b30
* sysdeps/i386/i686/strtok.S: Store pointer to NUL byte if NULL is returned. * sysdeps/i386/strtok.S: Likewise. * sysdeps/x86_64/strtok.S: Likewise. * string/Makefile (tests): Add bug-strtok1. * string/bug-strtok1.c: New file.
213 lines
6.1 KiB
ArmAsm
213 lines
6.1 KiB
ArmAsm
/* strtok (str, delim) -- Return next DELIM separated token from STR.
|
|
For AMD x86-64.
|
|
Copyright (C) 1998,2000-2003,2005,2006 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <sysdep.h>
|
|
#include "asm-syntax.h"
|
|
#include "bp-sym.h"
|
|
#include "bp-asm.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
|
|
ASM_TYPE_DIRECTIVE (save_ptr, @object)
|
|
.size save_ptr, 8
|
|
save_ptr:
|
|
.space 8
|
|
|
|
# ifdef PIC
|
|
# define SAVE_PTR save_ptr(%rip)
|
|
# else
|
|
# define SAVE_PTR save_ptr
|
|
# endif
|
|
|
|
# define FUNCTION strtok
|
|
#endif
|
|
|
|
.text
|
|
ENTRY (BP_SYM (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. */
|
|
movq %rdx, %rax
|
|
movq %rdx, %r9 /* Save value - see def. of SAVE_PTR. */
|
|
movq (%rax), %rax
|
|
#else
|
|
/* The value is in the local variable defined above. But
|
|
we have to take care for PIC code. */
|
|
movq SAVE_PTR, %rax
|
|
#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. */
|
|
movq %rdx, 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. */
|
|
movq %rdx, SAVE_PTR
|
|
jmp L(epilogue)
|
|
|
|
END (BP_SYM (FUNCTION))
|