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457 lines
14 KiB
C
457 lines
14 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. IA-64 version.
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Copyright (C) 1995-2023 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_machine_h
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#define dl_machine_h 1
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#define ELF_MACHINE_NAME "ia64"
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#include <assert.h>
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#include <string.h>
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#include <link.h>
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#include <errno.h>
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#include <dl-fptr.h>
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#include <tls.h>
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#include <dl-static-tls.h>
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#include <dl-machine-rel.h>
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/* Translate a processor specific dynamic tag to the index
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in l_info array. */
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#define DT_IA_64(x) (DT_IA_64_##x - DT_LOPROC + DT_NUM)
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static inline void __attribute__ ((always_inline))
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__ia64_init_bootstrap_fdesc_table (struct link_map *map)
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{
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Elf64_Addr *boot_table;
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/* careful: this will be called before got has been relocated... */
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asm (";; addl %0 = @gprel (_dl_boot_fptr_table), gp" : "=r"(boot_table));
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map->l_mach.fptr_table_len = ELF_MACHINE_BOOT_FPTR_TABLE_LEN;
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map->l_mach.fptr_table = boot_table;
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}
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#define ELF_MACHINE_BEFORE_RTLD_RELOC(map, dynamic_info) \
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__ia64_init_bootstrap_fdesc_table (map);
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/* Return nonzero iff ELF header is compatible with the running host. */
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static inline int __attribute__ ((unused))
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elf_machine_matches_host (const Elf64_Ehdr *ehdr)
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{
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return ehdr->e_machine == EM_IA_64;
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}
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/* Return the link-time address of _DYNAMIC. */
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static inline Elf64_Addr __attribute__ ((unused, const))
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elf_machine_dynamic (void)
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{
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Elf64_Addr *p;
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__asm__ (
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".section .sdata\n"
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" .type __dynamic_ltv#, @object\n"
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" .size __dynamic_ltv#, 8\n"
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"__dynamic_ltv:\n"
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" data8 @ltv(_DYNAMIC#)\n"
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".previous\n"
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" addl %0 = @gprel(__dynamic_ltv#), gp ;;"
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: "=r" (p));
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return *p;
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}
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/* Return the run-time load address of the shared object. */
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static inline Elf64_Addr __attribute__ ((unused))
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elf_machine_load_address (void)
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{
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Elf64_Addr ip;
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int *p;
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__asm__ (
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"1: mov %0 = ip\n"
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".section .sdata\n"
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"2: data4 @ltv(1b)\n"
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" .align 8\n"
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".previous\n"
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" addl %1 = @gprel(2b), gp ;;"
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: "=r" (ip), "=r" (p));
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return ip - (Elf64_Addr) *p;
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}
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/* Set up the loaded object described by L so its unrelocated PLT
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entries will jump to the on-demand fixup code in dl-runtime.c. */
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static inline int __attribute__ ((unused, always_inline))
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elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
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int lazy, int profile)
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{
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extern void _dl_runtime_resolve (void);
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extern void _dl_runtime_profile (void);
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if (lazy)
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{
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register Elf64_Addr gp __asm__ ("gp");
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Elf64_Addr *reserve, doit;
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/*
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* Careful with the typecast here or it will try to add l-l_addr
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* pointer elements
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*/
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reserve = ((Elf64_Addr *)
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(l->l_info[DT_IA_64 (PLT_RESERVE)]->d_un.d_ptr + l->l_addr));
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/* Identify this shared object. */
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reserve[0] = (Elf64_Addr) l;
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/* This function will be called to perform the relocation. */
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if (!profile)
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doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_resolve)->ip;
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else
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{
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if (GLRO(dl_profile) != NULL
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&& _dl_name_match_p (GLRO(dl_profile), l))
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{
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/* This is the object we are looking for. Say that we really
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want profiling and the timers are started. */
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GL(dl_profile_map) = l;
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}
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doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_profile)->ip;
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}
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reserve[1] = doit;
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reserve[2] = gp;
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}
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return lazy;
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}
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/* Names of the architecture-specific auditing callback functions. */
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#define ARCH_LA_PLTENTER ia64_gnu_pltenter
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#define ARCH_LA_PLTEXIT ia64_gnu_pltexit
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/* Undo the adds out0 = 16, sp below to get at the value we want in
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__libc_stack_end. */
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#define DL_STACK_END(cookie) \
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((void *) (((long) (cookie)) - 16))
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/* Initial entry point code for the dynamic linker.
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The C function `_dl_start' is the real entry point;
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its return value is the user program's entry point. */
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#define RTLD_START asm ( \
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".text\n" \
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" .global _start#\n" \
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" .proc _start#\n" \
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"_start:\n" \
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"0: { .mii\n" \
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" .prologue\n" \
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" .save rp, r0\n" \
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" .body\n" \
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" .prologue\n" \
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" .save ar.pfs, r32\n" \
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" alloc loc0 = ar.pfs, 0, 3, 4, 0\n" \
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" .body\n" \
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" mov r2 = ip\n" \
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" addl r3 = @gprel(0b), r0\n" \
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" ;;\n" \
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" }\n" \
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" { .mlx\n" \
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" /* Calculate the GP, and save a copy in loc1. */\n" \
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" sub gp = r2, r3\n" \
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" movl r8 = 0x9804c0270033f\n" \
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" ;;\n" \
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" }\n" \
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" { .mii\n" \
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" mov ar.fpsr = r8\n" \
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" sub loc1 = r2, r3\n" \
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" /* _dl_start wants a pointer to the pointer to the arg block and\n" \
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" the arg block starts with an integer, thus the magic 16. */\n" \
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" adds out0 = 16, sp\n" \
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" }\n" \
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" { .bbb\n" \
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" br.call.sptk.many b0 = _dl_start#\n" \
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" ;;\n" \
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" }\n" \
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" .endp _start#\n" \
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" /* FALLTHRU */\n" \
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" .global _dl_start_user#\n" \
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" .proc _dl_start_user#\n" \
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"_dl_start_user:\n" \
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" .prologue\n" \
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" .save rp, r0\n" \
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" .body\n" \
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" .prologue\n" \
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" .save ar.pfs, r32\n" \
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" .body\n" \
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" { .mii\n" \
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" /* Save the pointer to the user entry point fptr in loc2. */\n" \
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" mov loc2 = ret0\n" \
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" addl r2 = @ltoff(_dl_argc), gp\n" \
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" ;;\n" \
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" }\n" \
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" { .mii\n" \
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" ld8 out1 = [r2] /* Get the _dl_argc address. */\n" \
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" addl r3 = @ltoff(_dl_argv), gp\n" \
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" ;;\n" \
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" }\n" \
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" { .mmi\n" \
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" ld8 out2 = [r3] /* Get the _dl_argv address. */\n" \
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" ld8 out1 = [out1] /* Get the adjusted _dl_argc. */\n" \
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" addl r2 = @gprel(_rtld_local), gp\n" \
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" ;;\n" \
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" }\n" \
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" { .mmi\n" \
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" sxt4 out3 = out1 /* envp = argv + argc + 1 */\n" \
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" ;;\n" \
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" }\n" \
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" { .mmi\n" \
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" adds out3 = 1, out3\n" \
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" ;;\n" \
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" }\n" \
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" { .mmi\n" \
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" ld8 out2 = [out2] /* Get the adjusted _dl_argv. */\n" \
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" shladd out3 = out3, 3, r0\n" \
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" ;;\n" \
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" }\n" \
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" { .mmb\n" \
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" add out3 = out3, out2\n" \
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" ld8 out0 = [r2] /* Get the linkmap. */\n" \
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" br.call.sptk.many b0 = _dl_init#\n" \
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" }\n" \
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" /* Pass our finalizer function to the user,\n" \
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" and jump to the user's entry point. */\n" \
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" { .mmi\n" \
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" ld8 r3 = [loc2], 8\n" \
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" mov b0 = r0\n" \
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" }\n" \
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" { .mmi\n" \
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" addl ret0 = @ltoff(@fptr(_dl_fini#)), gp\n" \
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" ;;\n" \
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" mov b6 = r3\n" \
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" }\n" \
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" { .mmi\n" \
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" ld8 ret0 = [ret0]\n" \
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" ld8 gp = [loc2]\n" \
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" mov ar.pfs = loc0\n" \
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" ;;\n" \
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" }\n" \
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" { .mfb\n" \
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" br.sptk.many b6\n" \
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" ;;\n" \
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" }\n" \
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" .endp _dl_start_user#\n" \
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".previous\n");
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#ifndef RTLD_START_SPECIAL_INIT
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#define RTLD_START_SPECIAL_INIT /* nothing */
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#endif
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/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or TLS
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variable, so undefined references should not be allowed to define the
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value.
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ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one
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of the main executable's symbols, as for a COPY reloc, which we don't
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use. */
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/* ??? Ignore *MSB for now. */
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#define elf_machine_type_class(type) \
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(((type) == R_IA64_IPLTLSB || (type) == R_IA64_DTPMOD64LSB \
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|| (type) == R_IA64_DTPREL64LSB || (type) == R_IA64_TPREL64LSB) \
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* ELF_RTYPE_CLASS_PLT)
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/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
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#define ELF_MACHINE_JMP_SLOT R_IA64_IPLTLSB
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/* Return the address of the entry point. */
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#define ELF_MACHINE_START_ADDRESS(map, start) \
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({ \
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ElfW(Addr) addr; \
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DL_DT_FUNCTION_ADDRESS(map, start, static, addr) \
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addr; \
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})
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/* Fixup a PLT entry to bounce directly to the function at VALUE. */
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static inline struct fdesc __attribute__ ((always_inline))
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elf_machine_fixup_plt (struct link_map *l, lookup_t t,
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const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
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const Elf64_Rela *reloc,
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Elf64_Addr *reloc_addr, struct fdesc value)
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{
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/* l is the link_map for the caller, t is the link_map for the object
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* being called */
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/* got has already been relocated in elf_get_dynamic_info() */
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reloc_addr[1] = value.gp;
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/* we need a "release" here to ensure that the gp is visible before
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the code entry point is updated: */
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((volatile Elf64_Addr *) reloc_addr)[0] = value.ip;
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return value;
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}
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/* Return the final value of a plt relocation. */
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static inline struct fdesc
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elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
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struct fdesc value)
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{
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/* No need to handle rel vs rela since IA64 is rela only */
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return (struct fdesc) { value.ip + reloc->r_addend, value.gp };
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}
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#endif /* !dl_machine_h */
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#ifdef RESOLVE_MAP
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#define R_IA64_TYPE(R) ((R) & -8)
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#define R_IA64_FORMAT(R) ((R) & 7)
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#define R_IA64_FORMAT_32MSB 4
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#define R_IA64_FORMAT_32LSB 5
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#define R_IA64_FORMAT_64MSB 6
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#define R_IA64_FORMAT_64LSB 7
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/* Perform the relocation specified by RELOC and SYM (which is fully
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resolved). MAP is the object containing the reloc. */
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static inline void
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__attribute ((always_inline))
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elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
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const Elf64_Rela *reloc,
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const Elf64_Sym *sym,
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const struct r_found_version *version,
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void *const reloc_addr_arg,
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int skip_ifunc)
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{
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Elf64_Addr *const reloc_addr = reloc_addr_arg;
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const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info);
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Elf64_Addr value;
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/* We cannot use a switch here because we cannot locate the switch
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jump table until we've self-relocated. */
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#if !defined RTLD_BOOTSTRAP
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if (__builtin_expect (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_REL64LSB),
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0))
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{
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assert (ELF64_R_TYPE (reloc->r_info) == R_IA64_REL64LSB);
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value = *reloc_addr + map->l_addr;
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}
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else
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#endif
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if (__builtin_expect (r_type == R_IA64_NONE, 0))
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return;
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else
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{
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struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version,
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r_type);
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/* RESOLVE_MAP() will return NULL if it fail to locate the symbol. */
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if (sym_map != NULL)
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{
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value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
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if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DIR64LSB))
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;/* No adjustment. */
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else if (r_type == R_IA64_IPLTLSB)
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{
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elf_machine_fixup_plt (NULL, NULL, NULL, NULL, reloc, reloc_addr,
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DL_FIXUP_MAKE_VALUE (sym_map, value));
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return;
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}
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else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_FPTR64LSB))
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value = _dl_make_fptr (sym_map, sym, value);
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else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_PCREL64LSB))
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value -= (Elf64_Addr) reloc_addr & -16;
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else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DTPMOD64LSB))
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#ifdef RTLD_BOOTSTRAP
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/* During startup the dynamic linker is always index 1. */
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value = 1;
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#else
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/* Get the information from the link map returned by the
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resolv function. */
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value = sym_map->l_tls_modid;
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else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DTPREL64LSB))
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value -= sym_map->l_addr;
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#endif
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else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_TPREL64LSB))
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{
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#ifndef RTLD_BOOTSTRAP
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CHECK_STATIC_TLS (map, sym_map);
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#endif
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value += sym_map->l_tls_offset - sym_map->l_addr;
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}
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else
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_dl_reloc_bad_type (map, r_type, 0);
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}
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else
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value = 0;
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}
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/* ??? Ignore MSB and Instruction format for now. */
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if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_64LSB)
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*reloc_addr = value;
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else if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_32LSB)
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*(int *) reloc_addr = value;
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else if (r_type == R_IA64_IPLTLSB)
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{
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reloc_addr[0] = 0;
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reloc_addr[1] = 0;
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}
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else
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_dl_reloc_bad_type (map, r_type, 0);
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}
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/* Let do-rel.h know that on IA-64 if l_addr is 0, all RELATIVE relocs
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can be skipped. */
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#define ELF_MACHINE_REL_RELATIVE 1
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static inline void
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__attribute ((always_inline))
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elf_machine_rela_relative (Elf64_Addr l_addr, const Elf64_Rela *reloc,
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void *const reloc_addr_arg)
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{
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Elf64_Addr *const reloc_addr = reloc_addr_arg;
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/* ??? Ignore MSB and Instruction format for now. */
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assert (ELF64_R_TYPE (reloc->r_info) == R_IA64_REL64LSB);
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*reloc_addr += l_addr;
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}
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/* Perform a RELATIVE reloc on the .got entry that transfers to the .plt. */
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static inline void
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__attribute ((always_inline))
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elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
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Elf64_Addr l_addr, const Elf64_Rela *reloc,
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int skip_ifunc)
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{
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Elf64_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
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const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info);
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if (r_type == R_IA64_IPLTLSB)
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{
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reloc_addr[0] += l_addr;
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reloc_addr[1] += l_addr;
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}
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else if (r_type == R_IA64_NONE)
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return;
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else
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_dl_reloc_bad_type (map, r_type, 1);
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}
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#endif /* RESOLVE_MAP */
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