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ea14d04e9a
Add basic support for hwcap3 and hwcap4 in dynamic loader and ifunc resolvers. Describe new backward-compatible prototype for GNU indirect function resolvers that use a pointer to uint64_t array in stead of a pointer to the __ifunc_arg_t struct. This patch also adds macro _IFUNC_HWCAP_MAX to specify current number of hwcap elements. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* Machine-dependent ELF indirect relocation inline functions.
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AArch64 version.
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Copyright (C) 2012-2025 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 _DL_IREL_H
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#define _DL_IREL_H
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#include <stdio.h>
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#include <ldsodefs.h>
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#include <sys/ifunc.h>
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#define _IFUNC_ARG_SIZE_VER0 24 /* sizeof 1st published __ifunc_arg_t */
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#define _IFUNC_ARG_SIZE_VER1 40 /* sizeof 2nd published __ifunc_arg_t */
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#define sizeof_field(TYPE, MEMBER) sizeof ((((TYPE *)0)->MEMBER))
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#define offsetofend(TYPE, MEMBER) \
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(offsetof (TYPE, MEMBER) + sizeof_field (TYPE, MEMBER))
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_Static_assert (sizeof (__ifunc_arg_t) == _IFUNC_ARG_SIZE_VER1,
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"sizeof (__ifunc_arg_t) != _IFUNC_ARG_SIZE_VER1");
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_Static_assert (_IFUNC_ARG_SIZE_VER1
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== (_IFUNC_HWCAP_MAX + 1) * sizeof (unsigned long),
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"_IFUNC_ARG_SIZE_VER1 and _IFUNC_HWCAP_MAX mismatch");
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#undef offsetofend
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#undef sizeof_field
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#define ELF_MACHINE_IRELA 1
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static inline ElfW(Addr)
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__attribute ((always_inline))
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elf_ifunc_invoke (ElfW(Addr) addr)
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{
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__ifunc_arg_t arg;
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arg._size = sizeof (arg);
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arg._hwcap = GLRO(dl_hwcap);
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arg._hwcap2 = GLRO(dl_hwcap2);
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arg._hwcap3 = GLRO(dl_hwcap3);
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arg._hwcap4 = GLRO(dl_hwcap4);
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return ((ElfW(Addr) (*) (uint64_t, const __ifunc_arg_t *)) (addr))
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(GLRO(dl_hwcap) | _IFUNC_ARG_HWCAP, &arg);
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}
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static inline void
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__attribute ((always_inline))
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elf_irela (const ElfW(Rela) *reloc)
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{
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ElfW(Addr) *const reloc_addr = (void *) reloc->r_offset;
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const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info);
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if (__glibc_likely (r_type == R_AARCH64_IRELATIVE))
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{
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ElfW(Addr) value = elf_ifunc_invoke (reloc->r_addend);
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*reloc_addr = value;
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}
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else
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__libc_fatal ("Unexpected reloc type in static binary.\n");
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}
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#endif
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