mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 20:21:07 +00:00
359 lines
8.9 KiB
ArmAsm
359 lines
8.9 KiB
ArmAsm
/* strtok (str, delim) -- Return next DELIM separated token from STR.
|
|
For Intel 80x86, x>=3.
|
|
Copyright (C) 1996-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
|
|
|
|
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
|
|
|
|
#define PARMS 4 /* no space for saved regs */
|
|
#define RTN PARMS
|
|
#define STR RTN
|
|
#define DELIM STR+4
|
|
#define SAVE DELIM+4
|
|
|
|
.text
|
|
ENTRY (FUNCTION)
|
|
|
|
movl STR(%esp), %edx
|
|
movl DELIM(%esp), %eax
|
|
|
|
#if !defined USE_AS_STRTOK_R && defined PIC
|
|
pushl %ebx /* Save PIC register. */
|
|
cfi_adjust_cfa_offset (4)
|
|
call L(here)
|
|
cfi_adjust_cfa_offset (4)
|
|
cfi_rel_offset (ebx, 0)
|
|
L(here):
|
|
popl %ebx
|
|
cfi_adjust_cfa_offset (-4)
|
|
addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ebx
|
|
#endif
|
|
|
|
/* If the pointer is NULL we have to use the stored value of
|
|
the last run. */
|
|
cmpl $0, %edx
|
|
jne L(1)
|
|
|
|
#ifdef USE_AS_STRTOK_R
|
|
/* The value is stored in the third argument. */
|
|
movl SAVE(%esp), %edx
|
|
movl (%edx), %edx
|
|
#else
|
|
/* The value is in the local variable defined above. But
|
|
we have to take care for PIC code. */
|
|
movl SAVE_PTR, %edx
|
|
#endif
|
|
testl %edx, %edx
|
|
jz L(returnNULL)
|
|
|
|
L(1):
|
|
/* 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. The unrolled form is much faster than a loop. */
|
|
xorl %ecx, %ecx /* %ecx = 0 !!! */
|
|
|
|
pushl %ecx /* make a 256 bytes long block filled with 0 */
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0 /* These immediate values make the label 2 */
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0 /* to be aligned on a 16 byte boundary to */
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0 /* get a better performance of the loop. */
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl $0
|
|
cfi_adjust_cfa_offset (4)
|
|
|
|
/* 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_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_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_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_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): /* Remove the stopset table. */
|
|
addl $256, %esp
|
|
cfi_adjust_cfa_offset (-256)
|
|
|
|
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
|
|
je L(11)
|
|
|
|
incl %edx
|
|
L(11):
|
|
|
|
/* Store the pointer to the next character. */
|
|
#ifdef USE_AS_STRTOK_R
|
|
movl SAVE(%esp), %ecx
|
|
#endif
|
|
movl %edx, SAVE_PTR
|
|
|
|
L(epilogue):
|
|
#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)
|