| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include<elf.h> |
| #include<errno.h> |
| #include<private/bionic_auxv.h> |
| #include<private/bionic_globals.h> |
| #include<stddef.h> |
| #include<sys/auxv.h> |
| |
| // This function needs to be safe to call before TLS is set up, so it can't |
| // access errno or the stack protector. |
| // Cannot use HWASan, as this is called during setup of the HWASan runtime to |
| // determine the page size. |
| __LIBC_HIDDEN__unsignedlong __bionic_getauxval(unsignedlong type,bool* exists) __attribute__((no_sanitize("hwaddress"))){ |
| for(ElfW(auxv_t)* v= __libc_shared_globals()->auxv; v->a_type!= AT_NULL;++v){ |
| if(v->a_type== type){ |
| *exists=true; |
| return v->a_un.a_val; |
| } |
| } |
| *exists=false; |
| return0; |
| } |
| |
| // Cannot use HWASan, as this is called during setup of the HWASan runtime to |
| // determine the page size. |
| extern"C"unsignedlong getauxval(unsignedlong type) __attribute__((no_sanitize("hwaddress"))){ |
| bool exists; |
| unsignedlong result= __bionic_getauxval(type,&exists); |
| if(!exists) errno= ENOENT; |
| return result; |
| } |
