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67385a01 | 1 | /* powerpc HWCAP/HWCAP2 and AT_PLATFORM data pre-processing. |
688903eb | 2 | Copyright (C) 2015-2018 Free Software Foundation, Inc. |
67385a01 CES |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <unistd.h> | |
20 | #include <shlib-compat.h> | |
21 | #include <dl-procinfo.h> | |
22 | ||
23 | uint64_t __tcb_hwcap __attribute__ ((visibility ("hidden"))); | |
24 | uint32_t __tcb_platform __attribute__ ((visibility ("hidden"))); | |
25 | ||
26 | /* This function parses the HWCAP/HWCAP2 fields, adding the previous supported | |
27 | ISA bits, as well as converting the AT_PLATFORM string to a number. This | |
28 | data is stored in two global variables that can be used later by the | |
29 | powerpc-specific code to store it into the TCB. */ | |
30 | void | |
31 | __tcb_parse_hwcap_and_convert_at_platform (void) | |
32 | { | |
33 | ||
34 | uint64_t h1, h2; | |
35 | ||
36 | /* Read AT_PLATFORM string from auxv and convert it to a number. */ | |
37 | __tcb_platform = _dl_string_platform (GLRO (dl_platform)); | |
38 | ||
39 | /* Read HWCAP and HWCAP2 from auxv. */ | |
40 | h1 = GLRO (dl_hwcap); | |
41 | h2 = GLRO (dl_hwcap2); | |
42 | ||
43 | /* hwcap contains only the latest supported ISA, the code checks which is | |
44 | and fills the previous supported ones. */ | |
45 | ||
46 | if (h2 & PPC_FEATURE2_ARCH_2_07) | |
47 | h1 |= PPC_FEATURE_ARCH_2_06 | |
48 | | PPC_FEATURE_ARCH_2_05 | |
49 | | PPC_FEATURE_POWER5_PLUS | |
50 | | PPC_FEATURE_POWER5 | |
51 | | PPC_FEATURE_POWER4; | |
52 | else if (h1 & PPC_FEATURE_ARCH_2_06) | |
53 | h1 |= PPC_FEATURE_ARCH_2_05 | |
54 | | PPC_FEATURE_POWER5_PLUS | |
55 | | PPC_FEATURE_POWER5 | |
56 | | PPC_FEATURE_POWER4; | |
57 | else if (h1 & PPC_FEATURE_ARCH_2_05) | |
58 | h1 |= PPC_FEATURE_POWER5_PLUS | |
59 | | PPC_FEATURE_POWER5 | |
60 | | PPC_FEATURE_POWER4; | |
61 | else if (h1 & PPC_FEATURE_POWER5_PLUS) | |
62 | h1 |= PPC_FEATURE_POWER5 | |
63 | | PPC_FEATURE_POWER4; | |
64 | else if (h1 & PPC_FEATURE_POWER5) | |
65 | h1 |= PPC_FEATURE_POWER4; | |
66 | ||
67 | /* Consolidate both HWCAP and HWCAP2 into a single doubleword so that | |
68 | we can read both in a single load later. */ | |
69 | __tcb_hwcap = h2; | |
70 | __tcb_hwcap = (h1 << 32) | __tcb_hwcap; | |
71 | ||
72 | } | |
73 | #if IS_IN (rtld) | |
74 | versioned_symbol (ld, __tcb_parse_hwcap_and_convert_at_platform, \ | |
75 | __parse_hwcap_and_convert_at_platform, GLIBC_2_23); | |
76 | #endif | |
c676e659 CES |
77 | |
78 | /* Export __parse_hwcap_and_convert_at_platform in libc.a. This is used by | |
79 | GCC to make sure that the HWCAP/Platform bits are stored in the TCB when | |
80 | using __builtin_cpu_is()/__builtin_cpu_supports() in the static case. */ | |
81 | #ifndef SHARED | |
82 | weak_alias (__tcb_parse_hwcap_and_convert_at_platform, \ | |
83 | __parse_hwcap_and_convert_at_platform); | |
84 | #endif |