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ebf8934652
On rela architectures GNU BFD ld and gold store the relocation addend in GOT entries (in addition to the relocation's r_addend field). rtld previously relied on this to access its own _DYNAMIC symbol in order to apply its own relocations. However, recording addends in the GOT is not specified by the ABI, and some versions of LLVM's LLD linker leave the GOT uninitialized on rela architectures. BFD ld does not populate the GOT on sparc64, and sparc64 rtld has a machine-dependent rtld_dynamic_addr() function that returns the _DYNAMIC address. Use the same approach on amd64, obtaining the %rip- relative _DYNAMIC address following a suggestion from Rafael Espíndola. Architectures other than amd64 should be addressed in future work. PR: 214972 Reviewed by: kib MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D9180
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/*-
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* Copyright (c) 1999, 2000 John D. Polstra.
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* All rights reserved.
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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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Elf_Dyn *rtld_dynamic_addr(void);
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#define rtld_dynamic(obj) rtld_dynamic_addr()
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/* Fixup the jump slot at "where" to transfer control to "target". */
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static inline Elf_Addr
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reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
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const struct Struct_Obj_Entry *obj,
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const struct Struct_Obj_Entry *refobj, const Elf_Rel *rel)
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{
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#ifdef dbg
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dbg("reloc_jmpslot: *%p = %p", (void *)(where),
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(void *)(target));
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#endif
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(*(Elf_Addr *)(where) = (Elf_Addr)(target));
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return target;
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}
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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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extern uint32_t cpu_feature;
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extern uint32_t cpu_feature2;
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extern uint32_t cpu_stdext_feature;
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extern uint32_t cpu_stdext_feature2;
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#define call_ifunc_resolver(ptr) \
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(((Elf_Addr (*)(uint32_t, uint32_t, uint32_t, uint32_t))ptr)( \
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cpu_feature, cpu_feature2, cpu_stdext_feature, cpu_stdext_feature2))
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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(size, align)
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#define calculate_tls_offset(prev_offset, prev_size, size, align) \
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round((prev_offset) + (size), align)
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#define calculate_tls_end(off, size) (off)
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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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void *__tls_get_addr(tls_index *ti) __exported;
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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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