| /* Multiple versions of strlen |
| Copyright (C) 2009, 2010 Free Software Foundation, Inc. |
| Contributed by Intel Corporation. |
| This file is part of the GNU C Library. |
| |
| 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 <init-arch.h> |
| |
| /* Define multiple versions only for the definition in libc and for the |
| DSO. In static binaries, we need strlen before the initialization |
| happened. */ |
| #if defined SHARED && !defined NOT_IN_libc |
| .section .gnu.linkonce.t.__i686.get_pc_thunk.bx,"ax",@progbits |
| .globl __i686.get_pc_thunk.bx |
| .hidden __i686.get_pc_thunk.bx |
| .p2align 4 |
| .type __i686.get_pc_thunk.bx,@function |
| __i686.get_pc_thunk.bx: |
| movl (%esp), %ebx |
| ret |
| |
| .text |
| ENTRY(strlen) |
| .type strlen, @gnu_indirect_function |
| pushl %ebx |
| cfi_adjust_cfa_offset (4) |
| cfi_rel_offset (ebx, 0) |
| call __i686.get_pc_thunk.bx |
| addl $_GLOBAL_OFFSET_TABLE_, %ebx |
| cmpl $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx) |
| jne 1f |
| call __init_cpu_features |
| 1: leal __strlen_ia32@GOTOFF(%ebx), %eax |
| testl $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx) |
| jz 2f |
| leal __strlen_sse2_bsf@GOTOFF(%ebx), %eax |
| testl $bit_Slow_BSF, FEATURE_OFFSET+index_Slow_BSF+__cpu_features@GOTOFF(%ebx) |
| jz 2f |
| leal __strlen_sse2@GOTOFF(%ebx), %eax |
| 2: popl %ebx |
| cfi_adjust_cfa_offset (-4); |
| cfi_restore (ebx) |
| ret |
| END(strlen) |
| |
| # undef ENTRY |
| # define ENTRY(name) \ |
| .type __strlen_ia32, @function; \ |
| .globl __strlen_ia32; \ |
| .p2align 4; \ |
| __strlen_ia32: cfi_startproc; \ |
| CALL_MCOUNT |
| # undef END |
| # define END(name) \ |
| cfi_endproc; .size __strlen_ia32, .-__strlen_ia32 |
| # undef libc_hidden_builtin_def |
| /* IFUNC doesn't work with the hidden functions in shared library since |
| they will be called without setting up EBX needed for PLT which is |
| used by IFUNC. */ |
| # define libc_hidden_builtin_def(name) \ |
| .globl __GI_strlen; __GI_strlen = __strlen_ia32 |
| #endif |
| |
| #include "../../i586/strlen.S" |
