eeef183376
rtld-elf has some vestigial support for building as a static executable. r45501 introduced a partial implementation with a prescient note that it "might never be enabled." r153515 introduced ELF symbol versioning support, and removed part of the unused build infrastructure for static rtld. GNU ld populates rela relocation addends and GOT entries with the same values, and rtld's run-time dynamic executable check relied on this. Alternate toolchains may not populate the GOT entries, which caused RTLD_IS_DYNAMIC to return false. Simplify rtld by just removing the unused check. If we want to restore static rtld support later on we ought to introduce a build-time #ifdef flag. PR: 214972 Reviewed by: kan MFC after: 1 month Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D8687
116 lines
3.9 KiB
C
116 lines
3.9 KiB
C
/*-
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* Copyright (c) 1999, 2000 John D. Polstra.
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* Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* Portions of this software were developed by SRI International and the
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* University of Cambridge Computer Laboratory under DARPA/AFRL contract
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* FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Portions of this software were developed by the University of Cambridge
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* Computer Laboratory as part of the CTSRD Project, with support from the
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* UK Higher Education Innovation Fund (HEIF).
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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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uint64_t set_gp(struct Struct_Obj_Entry *obj);
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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("lla %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,
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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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({ \
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uint64_t old0; \
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old0 = set_gp(obj); \
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(((InitFunc)(target))()); \
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__asm __volatile("mv gp, %0" :: "r"(old0)); \
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})
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#define call_init_pointer(obj, target) \
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({ \
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uint64_t old1; \
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old1 = set_gp(obj); \
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(((InitArrFunc)(target))(main_argc, main_argv, environ)); \
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__asm __volatile("mv gp, %0" :: "r"(old1)); \
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})
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#define call_ifunc_resolver(ptr) \
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(((Elf_Addr (*)(void))ptr)())
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/*
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* Lazy binding entry point, called via PLT.
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*/
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void _rtld_bind_start(void);
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/*
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* TLS
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*/
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#define TLS_TP_OFFSET 0x0
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#define TLS_DTV_OFFSET 0x800
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#define TLS_TCB_SIZE 16
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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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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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