582 lines
15 KiB
C
582 lines
15 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. IA-64 version.
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Copyright (C) 1995, 1996, 1997, 2000 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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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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/* 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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/* An FPTR is a function descriptor. Properly they consist of just
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FUNC and GP. But we want to traverse a binary tree too. */
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#define IA64_BOOT_FPTR_SIZE 256
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struct ia64_fptr
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{
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Elf64_Addr func;
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Elf64_Addr gp;
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struct ia64_fptr *next;
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};
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extern struct ia64_fptr __boot_ldso_fptr[];
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extern struct ia64_fptr *__fptr_next;
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extern struct ia64_fptr *__fptr_root;
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extern int __fptr_count;
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extern Elf64_Addr __ia64_make_fptr (const struct link_map *, Elf64_Addr,
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struct ia64_fptr **, struct ia64_fptr *);
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/* Return nonzero iff E_MACHINE is compatible with the running host. */
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static inline int
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elf_machine_matches_host (Elf64_Word e_machine)
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{
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return 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
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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
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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
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elf_machine_runtime_setup (struct link_map *l, 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) ((struct ia64_fptr *)&_dl_runtime_resolve)->func;
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else
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{
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if (_dl_name_match_p (_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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_dl_profile_map = l;
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}
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doit = (Elf64_Addr) ((struct ia64_fptr *)&_dl_runtime_profile)->func;
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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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/*
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This code is used in dl-runtime.c to call the `fixup' function
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and then redirect to the address it returns. `fixup()' takes two
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arguments, however fixup_profile() takes three.
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The ABI specifies that we will never see more than 8 input
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registers to a function call, thus it is safe to simply allocate
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those, and simpler than playing stack games.
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- 12/09/99 Jes
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*/
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#define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name) \
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extern void tramp_name (void); \
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asm ( "\
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.global " #tramp_name "#
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.proc " #tramp_name "#
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" #tramp_name ":
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{ .mmi
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alloc loc0 = ar.pfs, 8, 2, 3, 0
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adds r2 = -144, r12
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adds r3 = -128, r12
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}
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{ .mii
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adds r12 = -160, r12
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mov loc1 = b0
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mov out2 = b0 /* needed by fixup_profile */
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;;
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}
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{ .mmi
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stf.spill [r2] = f8, 32
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stf.spill [r3] = f9, 32
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mov out0 = r16
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;;
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}
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{ .mmi
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stf.spill [r2] = f10, 32
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stf.spill [r3] = f11, 32
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shl out1 = r15, 4
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;;
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}
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{ .mmi
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stf.spill [r2] = f12, 32
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stf.spill [r3] = f13, 32
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shladd out1 = r15, 3, out1
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;;
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}
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{ .mmb
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stf.spill [r2] = f14
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stf.spill [r3] = f15
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br.call.sptk.many b0 = " #fixup_name "#
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}
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{ .mii
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ld8 r9 = [ret0], 8
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adds r2 = 16, r12
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adds r3 = 32, r12
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;;
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}
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{ .mmi
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ldf.fill f8 = [r2], 32
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ldf.fill f9 = [r3], 32
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mov b0 = loc1
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;;
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}
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{ .mmi
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ldf.fill f10 = [r2], 32
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ldf.fill f11 = [r3], 32
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mov b6 = r9
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;;
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}
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{ .mmi
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ldf.fill f12 = [r2], 32
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ldf.fill f13 = [r3], 32
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mov ar.pfs = loc0
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;;
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}
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{ .mmi
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ldf.fill f14 = [r2], 32
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ldf.fill f15 = [r3], 32
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adds r12 = 160, r12
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;;
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}
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/* An alloc is needed for the break system call to work.
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We don't care about the old value of the pfs register. */
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{ .mmb
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alloc r2 = ar.pfs, 0, 0, 8, 0
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ld8 gp = [ret0]
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br.sptk.many b6
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;;
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}
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.endp " #tramp_name "#")
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#ifndef PROF
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#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
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TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup); \
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TRAMPOLINE_TEMPLATE (_dl_runtime_profile, profile_fixup);
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#else
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#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
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TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup); \
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strong_alias (_dl_runtime_resolve, _dl_runtime_profile);
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#endif
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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
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.global _start#
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.proc _start#
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_start:
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0: { .mii
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alloc loc0 = ar.pfs, 0, 3, 4, 0
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mov r2 = ip
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addl r3 = @gprel(0b), r0
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;;
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}
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{ .mlx
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/* Calculate the GP, and save a copy in loc1. */
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sub gp = r2, r3
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movl r8 = 0x9804c0270033f
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;;
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}
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{ .mii
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mov ar.fpsr = r8
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sub loc1 = r2, r3
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/* _dl_start wants a pointer to the pointer to the arg block
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and the arg block starts with an integer, thus the magic 16. */
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adds out0 = 16, sp
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}
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{ .bbb
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br.call.sptk.many b0 = _dl_start#
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;;
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}
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.endp _start#
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/* FALLTHRU */
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.global _dl_start_user#
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.proc _dl_start_user#
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_dl_start_user:
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{ .mii
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/* Save the pointer to the user entry point fptr in loc2. */
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mov loc2 = ret0
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/* Store the highest stack address. */
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addl r2 = @ltoff(__libc_stack_end#), gp
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addl r3 = @gprel(_dl_skip_args), gp
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;;
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}
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{ .mmi
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ld8 r2 = [r2]
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ld4 r3 = [r3]
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adds r11 = 24, sp /* Load the address of argv. */
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;;
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}
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{ .mii
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st8 [r2] = sp
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adds r10 = 16, sp /* Load the address of argc. */
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mov out2 = r11
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;;
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/* See if we were run as a command with the executable file
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name as an extra leading argument. If so, adjust the argv
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pointer to skip _dl_skip_args words.
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Note that _dl_skip_args is an integer, not a long - Jes
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The stack pointer has to be 16 byte aligned. We cannot simply
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addjust the stack pointer. We have to move the whole argv and
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envp. H.J. */
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}
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{ .mmi
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ld8 out1 = [r10] /* is argc actually stored as a long
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or as an int? */
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;;
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sub out1 = out1, r3 /* Get the new argc. */
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shladd r15 = r3, 3, r11 /* The address of the argv we move */
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;;
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}
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/* ??? Could probably merge these two loops into 3 bundles.
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using predication to control which set of copies we're on. */
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1: /* Copy argv. */
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{ .mfi
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ld8 r16 = [r15], 8 /* Load the value in the old argv. */
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;;
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}
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{ .mib
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st8 [r11] = r16, 8 /* Store it in the new argv. */
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cmp.ne p6, p7 = 0, r16
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(p6) br.cond.dptk.few 1b
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;;
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}
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{ .mib
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mov out3 = r11
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addl out0 = @ltoff(_dl_loaded), gp
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}
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1: /* Copy env. */
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{ .mfi
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ld8 r16 = [r15], 8 /* Load the value in the old env. */
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;;
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}
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{ .mib
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st8 [r11] = r16, 8 /* Store it in the new env. */
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cmp.ne p6, p7 = 0, r16
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(p6) br.cond.dptk.few 1b
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;;
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}
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{ .mmb
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st8 [r10] = out1 /* Record the new argc. */
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ld8 out0 = [out0]
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}
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{ .mfb
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ld8 out0 = [out0] /* get the linkmap */
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br.call.sptk.many b0 = _dl_init#
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;;
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}
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/* Pass our finializer function to the user,
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and jump to the user's entry point. */
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{ .mmi
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ld8 r3 = [loc2], 8
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mov b0 = r0
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}
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{ .mmi
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addl ret0 = @ltoff(@fptr(_dl_fini#)), gp
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;;
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mov b6 = r3
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}
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{ .mmi
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ld8 ret0 = [ret0]
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ld8 gp = [loc2]
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mov ar.pfs = loc0
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;;
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}
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{ .mfb
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br.sptk.many b6
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;;
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}
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.endp _dl_start_user#
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.previous");
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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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/* Nonzero iff TYPE describes relocation of a PLT entry, so
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PLT entries should not be allowed to define the value. */
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/* ??? Ignore IPLTMSB for now. */
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#define elf_machine_lookup_noplt_p(type) ((type) == R_IA64_IPLTLSB)
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/* Nonzero iff TYPE should not be allowed to resolve to one of
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the main executable's symbols, as for a COPY reloc, which we don't use. */
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#define elf_machine_lookup_noexec_p(type) (0)
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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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/* According to the IA-64 specific documentation, Rela is always used. */
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#define ELF_MACHINE_NO_REL 1
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/* Since ia64's stack has to be 16byte aligned, we cannot arbitrarily
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move the stack pointer. */
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#define ELF_MACHINE_FIXED_STACK 1
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/* Return the address of the entry point. */
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extern ElfW(Addr) _dl_start_address (const struct link_map *map,
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ElfW(Addr) start);
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#define ELF_MACHINE_START_ADDRESS(map, start) \
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_dl_start_address ((map), (start))
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#define elf_machine_profile_fixup_plt(l, reloc, rel_addr, value) \
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elf_machine_fixup_plt ((l), (reloc), (rel_addr), (value))
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#define elf_machine_profile_plt(reloc_addr) ((Elf64_Addr) (reloc_addr))
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/* Fixup a PLT entry to bounce directly to the function at VALUE. */
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static inline Elf64_Addr
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elf_machine_fixup_plt (struct link_map *l, lookup_t t,
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const Elf64_Rela *reloc,
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Elf64_Addr *reloc_addr, Elf64_Addr 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] = t->l_info[DT_PLTGOT]->d_un.d_ptr;
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reloc_addr[0] = value;
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return (Elf64_Addr) reloc_addr;
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}
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|
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/* Return the final value of a plt relocation. */
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static inline Elf64_Addr
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elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
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Elf64_Addr value)
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|
{
|
|
/* No need to handle rel vs rela since IA64 is rela only */
|
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return value + reloc->r_addend;
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}
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|
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#endif /* !dl_machine_h */
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|
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#ifdef RESOLVE_MAP
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|
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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
|
|
resolved). MAP is the object containing the reloc. */
|
|
static inline void
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elf_machine_rela (struct link_map *map,
|
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const Elf64_Rela *reloc,
|
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const Elf64_Sym *sym,
|
|
const struct r_found_version *version,
|
|
Elf64_Addr *const reloc_addr)
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|
{
|
|
unsigned long const r_type = ELF64_R_TYPE (reloc->r_info);
|
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Elf64_Addr value;
|
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|
|
#ifndef RTLD_BOOTSTRAP
|
|
/* This is defined in rtld.c, but nowhere in the static libc.a; make the
|
|
reference weak so static programs can still link. This declaration
|
|
cannot be done when compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP)
|
|
because rtld.c contains the common defn for _dl_rtld_map, which is
|
|
incompatible with a weak decl in the same file. */
|
|
weak_extern (_dl_rtld_map);
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|
#endif
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|
|
/* We cannot use a switch here because we cannot locate the switch
|
|
jump table until we've self-relocated. */
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|
|
if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_REL64LSB))
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|
{
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value = *reloc_addr;
|
|
#ifndef RTLD_BOOTSTRAP
|
|
/* Already done in dynamic linker. */
|
|
if (map != &_dl_rtld_map)
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#endif
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value += map->l_addr;
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|
}
|
|
else if (r_type == R_IA64_NONE)
|
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return;
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|
else
|
|
{
|
|
struct link_map *sym_map;
|
|
|
|
/*
|
|
* RESOLVE_MAP() will return NULL if it fail to locate the symbol
|
|
*/
|
|
if ((sym_map = RESOLVE_MAP (&sym, version, r_type)))
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|
{
|
|
value = sym ? sym_map->l_addr + sym->st_value : 0;
|
|
value += reloc->r_addend;
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|
|
if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DIR64LSB))
|
|
;/* No adjustment. */
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|
else if (r_type == R_IA64_IPLTLSB)
|
|
{
|
|
elf_machine_fixup_plt (NULL, sym_map, reloc, reloc_addr, value);
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|
return;
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|
}
|
|
else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_FPTR64LSB))
|
|
#ifndef RTLD_BOOTSTRAP
|
|
value = __ia64_make_fptr (sym_map, value, &__fptr_root, NULL);
|
|
#else
|
|
{
|
|
struct ia64_fptr *p_boot_ldso_fptr;
|
|
struct ia64_fptr **p_fptr_root;
|
|
int *p_fptr_count;
|
|
|
|
/* Special care must be taken to address these variables
|
|
during bootstrap. Further, since we don't know exactly
|
|
when __fptr_next will be relocated, we index directly
|
|
off __boot_ldso_fptr. */
|
|
asm ("addl %0 = @gprel(__boot_ldso_fptr#), gp\n\t"
|
|
"addl %1 = @gprel(__fptr_root#), gp\n\t"
|
|
"addl %2 = @gprel(__fptr_count#), gp"
|
|
: "=r"(p_boot_ldso_fptr),
|
|
"=r"(p_fptr_root),
|
|
"=r"(p_fptr_count));
|
|
|
|
/*
|
|
* Go from the top - __ia64_make_fptr goes from the bottom,
|
|
* this way we will never clash.
|
|
*/
|
|
value = __ia64_make_fptr (sym_map, value, p_fptr_root,
|
|
&p_boot_ldso_fptr[--*p_fptr_count]);
|
|
}
|
|
#endif
|
|
else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_PCREL64LSB))
|
|
value -= (Elf64_Addr)reloc_addr & -16;
|
|
else
|
|
assert (! "unexpected dynamic reloc type");
|
|
}
|
|
else
|
|
value = 0;
|
|
}
|
|
|
|
/* ??? Ignore MSB and Instruction format for now. */
|
|
if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_64LSB)
|
|
*reloc_addr = value;
|
|
else if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_32LSB)
|
|
*(int *)reloc_addr = value;
|
|
else if (r_type == R_IA64_IPLTLSB)
|
|
{
|
|
reloc_addr[0] = 0;
|
|
reloc_addr[1] = 0;
|
|
}
|
|
else
|
|
assert (! "unexpected dynamic reloc format");
|
|
}
|
|
|
|
|
|
/* Perform a RELATIVE reloc on the .got entry that transfers to the .plt. */
|
|
static inline void
|
|
elf_machine_lazy_rel (struct link_map *map,
|
|
Elf64_Addr l_addr, const Elf64_Rela *reloc)
|
|
{
|
|
Elf64_Addr * const reloc_addr = (void *)(l_addr + reloc->r_offset);
|
|
unsigned long const r_type = ELF64_R_TYPE (reloc->r_info);
|
|
|
|
if (r_type == R_IA64_IPLTLSB)
|
|
{
|
|
reloc_addr[0] += l_addr;
|
|
reloc_addr[1] += l_addr;
|
|
}
|
|
else if (r_type == R_IA64_NONE)
|
|
return;
|
|
else
|
|
assert (! "unexpected PLT reloc type");
|
|
}
|
|
|
|
#endif /* RESOLVE_MAP */
|