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d51fa0a9b1
The aarch64 ELF spec has support for a variant of the normal procedure call standard that doesn't follow the normal register convention, e.g. using more registers as arguments, or different register state is preserved. Add support to rtld to handle this. As we don't know which registers need to be preserved disable lazy binding for these functions. Reviewed by: kib Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D44869
98 lines
3.6 KiB
C
98 lines
3.6 KiB
C
/*-
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* Copyright (c) 1999, 2000 John D. Polstra.
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* Copyright (c) 2014 the FreeBSD Foundation
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* All rights reserved.
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*
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* Portions of this software were developed by Andrew Turner
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef RTLD_MACHDEP_H
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#define RTLD_MACHDEP_H 1
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#include <sys/types.h>
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#include <machine/atomic.h>
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#include <machine/tls.h>
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struct Struct_Obj_Entry;
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#define MD_OBJ_ENTRY \
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bool variant_pcs : 1; /* Object has a variant pcs function */
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/* Return the address of the .dynamic section in the dynamic linker. */
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#define rtld_dynamic(obj) \
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({ \
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Elf_Addr _dynamic_addr; \
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asm volatile("adr %0, _DYNAMIC" : "=&r"(_dynamic_addr)); \
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(const Elf_Dyn *)_dynamic_addr; \
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})
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bool arch_digest_dynamic(struct Struct_Obj_Entry *obj, const Elf_Dyn *dynp);
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bool arch_digest_note(struct Struct_Obj_Entry *obj, const Elf_Note *note);
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Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
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const struct Struct_Obj_Entry *defobj, const struct Struct_Obj_Entry *obj,
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const Elf_Rel *rel);
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#define make_function_pointer(def, defobj) \
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((defobj)->relocbase + (def)->st_value)
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#define call_initfini_pointer(obj, target) \
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(((InitFunc)(target))())
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#define call_init_pointer(obj, target) \
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(((InitArrFunc)(target))(main_argc, main_argv, environ))
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/*
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* Pass zeros into the ifunc resolver so we can change them later. The first
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* 8 arguments on arm64 are passed in registers so make them known values
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* if we decide to use them later. Because of this ifunc resolvers can assume
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* no arguments are passed in, and if this changes later will be able to
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* compare the argument with 0 to see if it is set.
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*/
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#define call_ifunc_resolver(ptr) \
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(((Elf_Addr (*)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, \
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uint64_t, uint64_t, uint64_t))ptr)(0, 0, 0, 0, 0, 0, 0, 0))
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#define round(size, align) \
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(((size) + (align) - 1) & ~((align) - 1))
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#define calculate_first_tls_offset(size, align, offset) \
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round(16, align)
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#define calculate_tls_offset(prev_offset, prev_size, size, align, offset) \
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round(prev_offset + prev_size, align)
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#define calculate_tls_post_size(align) \
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round(TLS_TCB_SIZE, align) - TLS_TCB_SIZE
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typedef struct {
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unsigned long ti_module;
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unsigned long ti_offset;
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} tls_index;
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extern void *__tls_get_addr(tls_index *ti);
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#define md_abi_variant_hook(x)
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#endif
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