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The new __riscv_hwprobe() function is designed to be used by ifunc selector functions. This presents a challenge for applications and libraries, as ifunc selectors are invoked before all relocations have been performed, so an external call to __riscv_hwprobe() from an ifunc selector won't work. To address this, pass a pointer to the __riscv_hwprobe() function into ifunc selectors as the second argument (alongside dl_hwcap, which was already being passed). Include a typedef as well for convenience, so that ifunc users don't have to go through contortions to call this routine. Users will need to remember to check the second argument for NULL, to account for older glibcs that don't pass the function. Signed-off-by: Evan Green <evan@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
84 lines
3 KiB
C
84 lines
3 KiB
C
/* RISC-V architecture probe interface
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _SYS_HWPROBE_H
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#define _SYS_HWPROBE_H 1
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#include <features.h>
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#include <stddef.h>
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#ifdef __has_include
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# if __has_include (<asm/hwprobe.h>)
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# include <asm/hwprobe.h>
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# endif
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#endif
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/* Define a (probably stale) version of the interface if the Linux headers
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aren't present. */
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#ifndef RISCV_HWPROBE_KEY_MVENDORID
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struct riscv_hwprobe {
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signed long long int key;
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unsigned long long int value;
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};
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#define RISCV_HWPROBE_KEY_MVENDORID 0
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#define RISCV_HWPROBE_KEY_MARCHID 1
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#define RISCV_HWPROBE_KEY_MIMPID 2
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#define RISCV_HWPROBE_KEY_BASE_BEHAVIOR 3
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#define RISCV_HWPROBE_BASE_BEHAVIOR_IMA (1 << 0)
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#define RISCV_HWPROBE_KEY_IMA_EXT_0 4
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#define RISCV_HWPROBE_IMA_FD (1 << 0)
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#define RISCV_HWPROBE_IMA_C (1 << 1)
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#define RISCV_HWPROBE_IMA_V (1 << 2)
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#define RISCV_HWPROBE_EXT_ZBA (1 << 3)
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#define RISCV_HWPROBE_EXT_ZBB (1 << 4)
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#define RISCV_HWPROBE_EXT_ZBS (1 << 5)
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#define RISCV_HWPROBE_EXT_ZICBOZ (1 << 6)
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#define RISCV_HWPROBE_KEY_CPUPERF_0 5
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#define RISCV_HWPROBE_MISALIGNED_UNKNOWN (0 << 0)
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#define RISCV_HWPROBE_MISALIGNED_EMULATED (1 << 0)
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#define RISCV_HWPROBE_MISALIGNED_SLOW (2 << 0)
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#define RISCV_HWPROBE_MISALIGNED_FAST (3 << 0)
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#define RISCV_HWPROBE_MISALIGNED_UNSUPPORTED (4 << 0)
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#define RISCV_HWPROBE_MISALIGNED_MASK (7 << 0)
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#define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE 6
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#endif /* RISCV_HWPROBE_KEY_MVENDORID */
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__BEGIN_DECLS
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extern int __riscv_hwprobe (struct riscv_hwprobe *__pairs, size_t __pair_count,
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size_t __cpu_count, unsigned long int *__cpus,
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unsigned int __flags)
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__nonnull ((1)) __wur
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__fortified_attr_access (__read_write__, 1, 2)
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__fortified_attr_access (__read_only__, 4, 3);
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/* A pointer to the __riscv_hwprobe vDSO function is passed as the second
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argument to ifunc selector routines. Include a function pointer type for
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convenience in calling the function in those settings. */
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typedef int (*__riscv_hwprobe_t) (struct riscv_hwprobe *__pairs, size_t __pair_count,
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size_t __cpu_count, unsigned long int *__cpus,
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unsigned int __flags)
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__nonnull ((1)) __wur
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__fortified_attr_access (__read_write__, 1, 2)
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__fortified_attr_access (__read_only__, 4, 3);
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__END_DECLS
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#endif /* sys/hwprobe.h */
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