6e4fdb5c9d
This is based on the amd64 implementation. Support for both PLT and non-PLT (e.g. a global variable initilised with a pointer to an ifunc) cases are supported. We don't pass anything to the resolver as it is expected they will read the ID registers directly, with the number of registers with CPU info likely to increase in the future. Reviewed by: kib Approved by: re (gjb) Differential Revision: https://reviews.freebsd.org/D17341
97 lines
3.5 KiB
C
97 lines
3.5 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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* $FreeBSD$
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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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struct Struct_Obj_Entry;
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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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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 passeed 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) \
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round(16, align)
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#define calculate_tls_offset(prev_offset, prev_size, size, align) \
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round(prev_offset + prev_size, align)
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#define calculate_tls_end(off, size) ((off) + (size))
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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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#define TLS_TCB_SIZE 16
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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 RTLD_DEFAULT_STACK_PF_EXEC PF_X
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#define RTLD_DEFAULT_STACK_EXEC PROT_EXEC
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#define md_abi_variant_hook(x)
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#endif
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