| /* powerpc HWCAP/HWCAP2 and AT_PLATFORM data pre-processing. |
| Copyright (C) 2015-2018 Free Software Foundation, Inc. |
| 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <unistd.h> |
| #include <shlib-compat.h> |
| #include <dl-procinfo.h> |
| |
| uint64_t __tcb_hwcap __attribute__ ((visibility ("hidden"))); |
| uint32_t __tcb_platform __attribute__ ((visibility ("hidden"))); |
| |
| /* This function parses the HWCAP/HWCAP2 fields, adding the previous supported |
| ISA bits, as well as converting the AT_PLATFORM string to a number. This |
| data is stored in two global variables that can be used later by the |
| powerpc-specific code to store it into the TCB. */ |
| void |
| __tcb_parse_hwcap_and_convert_at_platform (void) |
| { |
| |
| uint64_t h1, h2; |
| |
| /* Read AT_PLATFORM string from auxv and convert it to a number. */ |
| __tcb_platform = _dl_string_platform (GLRO (dl_platform)); |
| |
| /* Read HWCAP and HWCAP2 from auxv. */ |
| h1 = GLRO (dl_hwcap); |
| h2 = GLRO (dl_hwcap2); |
| |
| /* hwcap contains only the latest supported ISA, the code checks which is |
| and fills the previous supported ones. */ |
| |
| if (h2 & PPC_FEATURE2_ARCH_2_07) |
| h1 |= PPC_FEATURE_ARCH_2_06 |
| | PPC_FEATURE_ARCH_2_05 |
| | PPC_FEATURE_POWER5_PLUS |
| | PPC_FEATURE_POWER5 |
| | PPC_FEATURE_POWER4; |
| else if (h1 & PPC_FEATURE_ARCH_2_06) |
| h1 |= PPC_FEATURE_ARCH_2_05 |
| | PPC_FEATURE_POWER5_PLUS |
| | PPC_FEATURE_POWER5 |
| | PPC_FEATURE_POWER4; |
| else if (h1 & PPC_FEATURE_ARCH_2_05) |
| h1 |= PPC_FEATURE_POWER5_PLUS |
| | PPC_FEATURE_POWER5 |
| | PPC_FEATURE_POWER4; |
| else if (h1 & PPC_FEATURE_POWER5_PLUS) |
| h1 |= PPC_FEATURE_POWER5 |
| | PPC_FEATURE_POWER4; |
| else if (h1 & PPC_FEATURE_POWER5) |
| h1 |= PPC_FEATURE_POWER4; |
| |
| /* Consolidate both HWCAP and HWCAP2 into a single doubleword so that |
| we can read both in a single load later. */ |
| __tcb_hwcap = h2; |
| __tcb_hwcap = (h1 << 32) | __tcb_hwcap; |
| |
| } |
| #if IS_IN (rtld) |
| versioned_symbol (ld, __tcb_parse_hwcap_and_convert_at_platform, \ |
| __parse_hwcap_and_convert_at_platform, GLIBC_2_23); |
| #endif |
| |
| /* Export __parse_hwcap_and_convert_at_platform in libc.a. This is used by |
| GCC to make sure that the HWCAP/Platform bits are stored in the TCB when |
| using __builtin_cpu_is()/__builtin_cpu_supports() in the static case. */ |
| #ifndef SHARED |
| weak_alias (__tcb_parse_hwcap_and_convert_at_platform, \ |
| __parse_hwcap_and_convert_at_platform); |
| #endif |
