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211 lines
6.0 KiB
ArmAsm
211 lines
6.0 KiB
ArmAsm
/* strtok (str, delim) -- Return next DELIM separated token from STR.
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For AMD x86-64.
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Copyright (C) 1998-2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Based on i686 version contributed by Ulrich Drepper
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<drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include "asm-syntax.h"
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#include "bp-sym.h"
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#include "bp-asm.h"
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/* This file can be used for the strtok and strtok_r functions:
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strtok:
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INPUT PARAMETER:
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str %rdi
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delim %rsi
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strtok_r:
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INPUT PARAMETER:
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str %rdi
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delim %rsi
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save_ptr %rdx
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We do a common implementation here. */
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#ifdef USE_AS_STRTOK_R
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# define SAVE_PTR (%r9)
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#else
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.bss
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.local save_ptr
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.type save_ptr, @object
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.size save_ptr, LP_SIZE
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save_ptr:
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.space LP_SIZE
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# ifdef PIC
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# define SAVE_PTR save_ptr(%rip)
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# else
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# define SAVE_PTR save_ptr
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# endif
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# define FUNCTION strtok
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#endif
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.text
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ENTRY (BP_SYM (FUNCTION))
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/* First we create a table with flags for all possible characters.
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For the ASCII (7bit/8bit) or ISO-8859-X character sets which are
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supported by the C string functions we have 256 characters.
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Before inserting marks for the stop characters we clear the whole
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table. */
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movq %rdi, %r8 /* Save value. */
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subq $256, %rsp /* Make space for 256 bytes. */
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cfi_adjust_cfa_offset(256)
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movl $32, %ecx /* 32*8 bytes = 256 bytes. */
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movq %rsp, %rdi
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xorl %eax, %eax /* We store 0s. */
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cld
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rep
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stosq
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/* Note: %rcx = 0 !!! */
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#ifdef USE_AS_STRTOK_R
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/* The value is stored in the third argument. */
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mov %RDX_LP, %R9_LP /* Save value - see def. of SAVE_PTR. */
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mov (%rdx), %RAX_LP
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#else
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/* The value is in the local variable defined above. But
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we have to take care for PIC code. */
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mov SAVE_PTR, %RAX_LP
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#endif
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movq %r8, %rdx /* Get start of string. */
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/* If the pointer is NULL we have to use the stored value of
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the last run. */
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cmpq $0, %rdx
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cmove %rax, %rdx
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testq %rdx, %rdx
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jz L(returnNULL)
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movq %rsi, %rax /* Get start of delimiter set. */
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/* For understanding the following code remember that %rcx == 0 now.
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Although all the following instruction only modify %cl we always
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have a correct zero-extended 64-bit value in %rcx. */
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L(2): movb (%rax), %cl /* get byte from stopset */
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testb %cl, %cl /* is NUL char? */
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jz L(1) /* yes => start compare loop */
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movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */
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movb 1(%rax), %cl /* get byte from stopset */
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testb $0xff, %cl /* is NUL char? */
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jz L(1) /* yes => start compare loop */
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movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */
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movb 2(%rax), %cl /* get byte from stopset */
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testb $0xff, %cl /* is NUL char? */
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jz L(1) /* yes => start compare loop */
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movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */
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movb 3(%rax), %cl /* get byte from stopset */
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addq $4, %rax /* increment stopset pointer */
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movb %cl, (%rsp,%rcx) /* set corresponding byte in stopset table */
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testb $0xff, %cl /* is NUL char? */
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jnz L(2) /* no => process next dword from stopset */
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L(1):
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leaq -4(%rdx), %rax /* prepare loop */
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/* We use a neat trick for the following loop. Normally we would
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have to test for two termination conditions
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1. a character in the stopset was found
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and
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2. the end of the string was found
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As a sign that the character is in the stopset we store its
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value in the table. The value of NUL is NUL so the loop
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terminates for NUL in every case. */
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L(3): addq $4, %rax /* adjust pointer for full loop round */
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movb (%rax), %cl /* get byte from string */
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testb %cl, (%rsp,%rcx) /* is it contained in stopset? */
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jz L(4) /* no => start of token */
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movb 1(%rax), %cl /* get byte from string */
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testb %cl, (%rsp,%rcx) /* is it contained in stopset? */
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jz L(5) /* no => start of token */
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movb 2(%rax), %cl /* get byte from string */
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testb %cl, (%rsp,%rcx) /* is it contained in stopset? */
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jz L(6) /* no => start of token */
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movb 3(%rax), %cl /* get byte from string */
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testb %cl, (%rsp,%rcx) /* is it contained in stopset? */
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jnz L(3) /* yes => start of loop */
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incq %rax /* adjust pointer */
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L(6): incq %rax
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L(5): incq %rax
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/* Now we have to terminate the string. */
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L(4): leaq -4(%rax), %rdx /* We use %rDX for the next run. */
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L(7): addq $4, %rdx /* adjust pointer for full loop round */
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movb (%rdx), %cl /* get byte from string */
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cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */
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je L(8) /* yes => return */
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movb 1(%rdx), %cl /* get byte from string */
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cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */
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je L(9) /* yes => return */
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movb 2(%rdx), %cl /* get byte from string */
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cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */
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je L(10) /* yes => return */
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movb 3(%rdx), %cl /* get byte from string */
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cmpb %cl, (%rsp,%rcx) /* is it contained in skipset? */
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jne L(7) /* no => start loop again */
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incq %rdx /* adjust pointer */
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L(10): incq %rdx
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L(9): incq %rdx
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L(8): cmpq %rax, %rdx
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je L(returnNULL) /* There was no token anymore. */
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movb $0, (%rdx) /* Terminate string. */
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/* Are we at end of string? */
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cmpb $0, %cl
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leaq 1(%rdx), %rcx
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cmovne %rcx, %rdx
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/* Store the pointer to the next character. */
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mov %RDX_LP, SAVE_PTR
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L(epilogue):
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/* Remove the stopset table. */
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addq $256, %rsp
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cfi_adjust_cfa_offset(-256)
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retq
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L(returnNULL):
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xorl %eax, %eax
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/* Store the pointer to the next character. */
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mov %RDX_LP, SAVE_PTR
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jmp L(epilogue)
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END (BP_SYM (FUNCTION))
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