mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
1d60b9dfda
powerpc was the only architecture with arch-specific hooks for LD_SHOW_AUXV, and with the information moved to ld diagnostics there is no need to keep the _dl_procinfo hook. Checked with a build for all affected ABIs. Reviewed-by: Peter Bergner <bergner@linux.ibm.com>
96 lines
3.5 KiB
C
96 lines
3.5 KiB
C
/* powerpc HWCAP/HWCAP2 and AT_PLATFORM data pre-processing.
|
|
Copyright (C) 2015-2025 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <unistd.h>
|
|
#include <shlib-compat.h>
|
|
#include <cpu-features.c>
|
|
|
|
tcbhead_t __tcb __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, h3, h4;
|
|
|
|
/* Read AT_PLATFORM string from auxv and convert it to a number. */
|
|
__tcb.at_platform = _dl_string_platform (GLRO (dl_platform));
|
|
|
|
/* Read HWCAP and HWCAP2 from auxv. */
|
|
h1 = GLRO (dl_hwcap);
|
|
h2 = GLRO (dl_hwcap2);
|
|
h3 = GLRO (dl_hwcap3);
|
|
h4 = GLRO (dl_hwcap4);
|
|
|
|
/* 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;
|
|
|
|
uint64_t array_hwcaps[] = { h1, h2, h3, h4 };
|
|
init_cpu_features (&GLRO(dl_powerpc_cpu_features), array_hwcaps);
|
|
|
|
/* Consolidate both HWCAP and HWCAP2 into a single doubleword so that
|
|
we can read both in a single load later. */
|
|
__tcb.hwcap = (h1 << 32) | (h2 & 0xffffffff);
|
|
|
|
/* Consolidate both HWCAP3 and HWCAP4 into a single doubleword so that
|
|
we can read both in a single load later. */
|
|
__tcb.hwcap_extn = (h3 << 32) | (h4 & 0xffffffff);
|
|
|
|
}
|
|
#if IS_IN (rtld)
|
|
versioned_symbol (ld, __tcb_parse_hwcap_and_convert_at_platform, \
|
|
__parse_hwcap_and_convert_at_platform, GLIBC_2_23);
|
|
versioned_symbol (ld, __tcb_parse_hwcap_and_convert_at_platform, \
|
|
__parse_hwcap_3_4_and_convert_at_platform, GLIBC_2_39);
|
|
#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);
|
|
weak_alias (__tcb_parse_hwcap_and_convert_at_platform, \
|
|
__parse_hwcap_3_4_and_convert_at_platform);
|
|
#endif
|