about summary refs log tree commit diff
path: root/sysdeps/i386/i686/strtok.S
blob: a982a4aa49c21062f95ee2356220c724d0806613 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
/* strtok (str, delim) -- Return next DELIM separated token from STR.
   For Intel 80686.
   Copyright (C) 1998, 2000 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  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 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
	ASM_TYPE_DIRECTIVE (save_ptr, @object)
	.size save_ptr, 4
save_ptr:
# if __BOUNDED_POINTERS__
	.space 12
# else
	.space 4
# endif

# 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	LINKAGE+256+4	/* space for table and saved PIC register */
#else
# define PARMS	LINKAGE+256	/* space for table */
#endif
#define RTN	PARMS
#define STR	RTN+RTN_SIZE
#define DELIM	STR+PTR_SIZE
#ifdef USE_AS_STRTOK_R
# define SAVE	DELIM+PTR_SIZE
#endif

	.text

#if !defined USE_AS_STRTOK_R && defined PIC
0:	movl (%esp), %ebx
	ret
#endif

ENTRY (BP_SYM (FUNCTION))
	ENTER

#if !defined USE_AS_STRTOK_R && defined PIC
	pushl %ebx			/* Save PIC register.  */
	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
	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
#if __BOUNDED_POINTERS__
# ifdef USE_AS_STRTOK_R
	movl SAVE(%esp), %ecx	/* borrow %ecx for a moment */
# endif
	je L(0)
	/* Save bounds of incoming non-NULL STR into save area.  */
	movl 4+STR(%esp), %eax
	movl %eax, 4+SAVE_PTR
	movl 8+STR(%esp), %eax
	movl %eax, 8+SAVE_PTR
L(0):	CHECK_BOUNDS_LOW (%edx, SAVE_PTR)
# ifdef USE_AS_STRTOK_R
	xorl %ecx, %ecx		/* restore %ecx to zero */
# endif
#endif
	movl DELIM(%esp), %eax		/* Get start of delimiter set.  */
	CHECK_BOUNDS_LOW (%eax, DELIM(%esp))

/* 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_2)		/* 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_3)		/* 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 */

#if __BOUNDED_POINTERS__
	jmp L(1_0)		/* pointer is correct for bounds check */
L(1_3):	incl %eax		/* adjust pointer for bounds check */
L(1_2):	incl %eax		/* ditto */
L(1_1):	incl %eax		/* ditto */
L(1_0):	CHECK_BOUNDS_HIGH (%eax, DELIM(%esp), jbe)
#else
L(1_3):; L(1_2):; L(1_1):	/* fall through */
#endif
	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
	CHECK_BOUNDS_HIGH (%edx, SAVE_PTR, jb)
	RETURN_BOUNDED_POINTER (SAVE_PTR)

L(epilogue):
	/* Remove the stopset table.  */
	addl $256, %esp
#if !defined USE_AS_STRTOK_R && defined PIC
	popl %ebx
#endif
	LEAVE
	RET_PTR

L(returnNULL):
	xorl %eax, %eax
	RETURN_NULL_BOUNDED_POINTER
	jmp L(epilogue)

END (BP_SYM (FUNCTION))