HP/PA specific dynamic linker internals.
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/* Machine-dependent ELF dynamic relocation inline functions. PA-RISC version.
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Copyright (C) 1995, 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
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Contributed by David Huggins-Daines <dhd@debian.org>
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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 "hppa"
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#include <sys/param.h>
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#include <string.h>
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#include <link.h>
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#include <assert.h>
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/* These must match the definition of the stub in bfd/elf32-hppa.c. */
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#define SIZEOF_PLT_STUB (4*4)
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#define GOT_FROM_PLT_STUB (4*4)
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/* A PLABEL 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. See
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dl-fptr.c for the code (it may be made common between HPPA and
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IA-64 in the future).
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We call these 'fptr' to make it easier to steal code from IA-64. */
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/* ld.so currently has 12 PLABEL32 relocs. We'll keep this constant
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large for now in case we require more, as the rest of these will be
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used by the dynamic program itself (libc.so has quite a few
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PLABEL32 relocs in it). */
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#define HPPA_BOOT_FPTR_SIZE 256
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struct hppa_fptr
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{
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Elf32_Addr func;
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Elf32_Addr gp;
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struct hppa_fptr *next;
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};
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extern struct hppa_fptr __boot_ldso_fptr[];
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extern struct hppa_fptr *__fptr_root;
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extern int __fptr_count;
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extern Elf32_Addr __hppa_make_fptr (const struct link_map *, Elf32_Addr,
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struct hppa_fptr **, struct hppa_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 (Elf32_Half e_machine)
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{
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return e_machine == EM_PARISC;
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}
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/* Return the link-time address of _DYNAMIC. */
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static inline Elf32_Addr
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elf_machine_dynamic (void)
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{
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Elf32_Addr dynamic;
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#if 0
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/* Use this method if GOT address not yet set up. */
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asm ("\
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b,l 1f,%0
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depi 0,31,2,%0
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1: addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 8),%0
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ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 12)(%%r1),%0"
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: "=r" (dynamic) : : "r1");
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#else
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/* This works because we already have our GOT address available. */
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dynamic = (Elf32_Addr) &_DYNAMIC;
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#endif
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return dynamic;
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}
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/* Return the run-time load address of the shared object. */
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static inline Elf32_Addr
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elf_machine_load_address (void)
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{
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Elf32_Addr dynamic, dynamic_linkaddress;
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asm ("\
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b,l 1f,%0
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depi 0,31,2,%0
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1: addil L'_DYNAMIC - ($PIC_pcrel$0 - 8),%0
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ldo R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%%r1),%1
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addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%0
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ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%%r1),%0"
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: "=r" (dynamic_linkaddress), "=r" (dynamic) : : "r1");
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return dynamic - dynamic_linkaddress;
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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 Elf32_Addr
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elf_machine_fixup_plt (struct link_map *map, lookup_t t,
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const Elf32_Rela *reloc,
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Elf32_Addr *reloc_addr, Elf32_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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reloc_addr[1] = D_PTR (t, l_info[DT_PLTGOT]);
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reloc_addr[0] = value;
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/* Return the PLT slot rather than the function value so that the
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trampoline can load the new LTP. */
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return (Elf32_Addr) reloc_addr;
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}
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/* Return the final value of a plt relocation. */
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static inline Elf32_Addr
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elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
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Elf32_Addr value)
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{
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/* We are rela only */
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return value + reloc->r_addend;
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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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Elf32_Addr jmprel = D_PTR(l, l_info[DT_JMPREL]);
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if (lazy && jmprel)
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{
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Elf32_Addr *got = NULL;
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Elf32_Addr l_addr;
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Elf32_Addr end_jmprel;
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Elf32_Addr iplt;
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/* Relocate all the PLT slots. */
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l_addr = l->l_addr;
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end_jmprel = jmprel + l->l_info[DT_PLTRELSZ]->d_un.d_val;
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for (iplt = jmprel; iplt < end_jmprel; iplt += sizeof (Elf32_Rela))
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{
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const Elf32_Rela *reloc;
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Elf32_Word r_type;
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Elf32_Word r_sym;
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struct hppa_fptr *fptr;
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reloc = (const Elf32_Rela *) iplt;
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r_type = ELF32_R_TYPE (reloc->r_info);
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r_sym = ELF32_R_SYM (reloc->r_info);
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if (__builtin_expect (r_type == R_PARISC_IPLT, 1))
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{
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fptr = (struct hppa_fptr *) (reloc->r_offset + l_addr);
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if (r_sym != 0)
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{
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/* Relocate the pointer to the stub. */
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fptr->func += l_addr;
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/* Instead of the LTP value, we put the reloc offset
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here. The trampoline code will load the proper
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LTP and pass the reloc offset to the fixup
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function. */
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fptr->gp = iplt - jmprel;
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if (!got)
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{
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static union {
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unsigned char c[8];
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Elf32_Addr i[2];
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} sig = {{0x00,0xc0,0xff,0xee, 0xde,0xad,0xbe,0xef}};
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/* Find our .got section. It's right after the
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stub. */
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got = (Elf32_Addr *) (fptr->func + GOT_FROM_PLT_STUB);
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/* Sanity check to see if the address we are
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going to check below is within a reasonable
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approximation of the bounds of the PLT (or,
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at least, is at an address that won't fault
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on read). Then check for the magic signature
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above. */
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if (fptr->func < (Elf32_Addr) fptr + sizeof(*fptr))
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return 0;
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if (fptr->func >
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((Elf32_Addr) fptr
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+ SIZEOF_PLT_STUB
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+ ((l->l_info[DT_PLTRELSZ]->d_un.d_val / sizeof (Elf32_Rela))
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* 8)))
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return 0;
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if (got[-2] != sig.i[0] || got[-1] != sig.i[1])
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return 0; /* No lazy linking for you! */
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}
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}
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else
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{
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/* Relocate this *ABS* entry. */
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fptr->func = reloc->r_addend + l_addr;
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fptr->gp = D_PTR (l, l_info[DT_PLTGOT]);
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}
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}
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else if (__builtin_expect (r_type != R_PARISC_NONE, 0))
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_dl_reloc_bad_type (l, r_type, 1);
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}
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if (got)
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{
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register Elf32_Addr ltp __asm__ ("%r19");
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/* Identify this shared object. */
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got[1] = (Elf32_Addr) l;
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/* This function will be called to perform the relocation. */
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if (__builtin_expect (!profile, 1))
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got[-2] =
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(Elf32_Addr) ((struct hppa_fptr *)
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((unsigned long) &_dl_runtime_resolve & ~3))->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
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we really want profiling and the timers are
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started. */
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_dl_profile_map = l;
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}
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got[-2] =
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(Elf32_Addr) ((struct hppa_fptr *)
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((unsigned long) &_dl_runtime_profile & ~3))->func;
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}
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got[-1] = ltp;
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}
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}
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return lazy;
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}
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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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.globl _start
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.type _start,@function
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_start:
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/* The kernel does not give us an initial stack frame. */
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ldo 64(%sp),%sp
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/* Save the relevant arguments (yes, those are the correct
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registers, the kernel is weird) in their stack slots. */
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stw %r25,-40(%sp) /* argc */
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stw %r24,-44(%sp) /* argv */
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/* We need the LTP, and we need it now. */
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/* $PIC_pcrel$0 points 8 bytes past the current instruction,
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just like a branch reloc. This sequence gets us the runtime
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address of _DYNAMIC. */
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bl 0f,%r19
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depi 0,31,2,%r19 /* clear priviledge bits */
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0: addil L'_DYNAMIC - ($PIC_pcrel$0 - 8),%r19
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ldo R'_DYNAMIC - ($PIC_pcrel$0 - 12)(%r1),%r26
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/* Also get the link time address from the first entry of the GOT. */
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addil L'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 16),%r19
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ldw R'_GLOBAL_OFFSET_TABLE_ - ($PIC_pcrel$0 - 20)(%r1),%r20
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sub %r26,%r20,%r20 /* Calculate load offset */
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/* Rummage through the dynamic entries, looking for DT_PLTGOT. */
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ldw,ma 8(%r26),%r19
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1: cmpib,=,n 3,%r19,2f /* tag == DT_PLTGOT? */
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cmpib,<>,n 0,%r19,1b
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ldw,ma 8(%r26),%r19
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/* Uh oh! We didn't find one. Abort. */
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iitlbp %r0,(%r0)
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2: ldw -4(%r26),%r19 /* Found it, load value. */
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add %r19,%r20,%r19 /* And add the load offset. */
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/* Our initial stack layout is rather different from everyone
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else's due to the unique PA-RISC ABI. As far as I know it
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looks like this:
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----------------------------------- (this frame created above)
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| 32 bytes of magic |
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|---------------------------------|
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| 32 bytes argument/sp save area |
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|---------------------------------| ((current->mm->env_end) + 63 & ~63)
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| N bytes of slack |
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|---------------------------------|
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| envvar and arg strings |
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|---------------------------------|
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| ELF auxiliary info |
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| (up to 28 words) |
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|---------------------------------|
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| Environment variable pointers |
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| upwards to NULL |
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|---------------------------------|
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| Argument pointers |
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| upwards to NULL |
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|---------------------------------|
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| argc (1 word) |
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-----------------------------------
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So, obviously, we can't just pass %sp to _dl_start. That's
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okay, argv-4 will do just fine.
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The pleasant part of this is that if we need to skip
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arguments we can just decrement argc and move argv, because
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the stack pointer is utterly unrelated to the location of
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the environment and argument vectors. */
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/* This is always within range so we'll be okay. */
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bl _dl_start,%rp
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ldo -4(%r24),%r26
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/* FALLTHRU */
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.globl _dl_start_user
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.type _dl_start_user,@function
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_dl_start_user:
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/* Save the entry point in %r3. */
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copy %ret0,%r3
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/* Remember the lowest stack address. */
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addil LT'__libc_stack_end,%r19
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ldw RT'__libc_stack_end(%r1),%r20
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stw %sp,0(%r20)
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/* See if we were called as a command with the executable file
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name as an extra leading argument. */
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addil LT'_dl_skip_args,%r19
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ldw RT'_dl_skip_args(%r1),%r20
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ldw 0(%r20),%r20
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ldw -40(%sp),%r25 /* argc */
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comib,= 0,%r20,.Lnofix /* FIXME: will be mispredicted */
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ldw -44(%sp),%r24 /* argv (delay slot) */
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sub %r25,%r20,%r25
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stw %r25,-40(%sp)
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sh2add %r20,%r24,%r24
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stw %r24,-44(%sp)
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.Lnofix:
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/* Call _dl_init(_dl_loaded, argc, argv, envp). */
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addil LT'_dl_loaded,%r19
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ldw RT'_dl_loaded(%r1),%r26
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ldw 0(%r26),%r26
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/* envp = argv + argc + 1 */
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sh2add %r25,%r24,%r23
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bl _dl_init,%r2
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ldo 4(%r23),%r23 /* delay slot */
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/* Reload argc, argv to the registers start.S expects them in (feh) */
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ldw -40(%sp),%r25
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ldw -44(%sp),%r24
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/* _dl_fini does have a PLT slot now. I don't know how to get
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to it though, so this hack will remain. */
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.section .data
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__dl_fini_plabel:
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.word _dl_fini
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.word 0xdeadbeef
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.previous
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addil LT'__dl_fini_plabel,%r19
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ldw RT'__dl_fini_plabel(%r1),%r23
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stw %r19,4(%r23)
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bv %r0(%r3)
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depi 2,31,2,%r23 /* delay slot */");
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/* This code gets called via the .plt stub, and is used in
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dl-runtime.c to call the `fixup' function and then redirect to the
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address it returns.
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Enter with r19 = reloc offset, r20 = got-8, r21 = fixup ltp. */
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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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/* Trampoline for " #tramp_name " */
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.globl " #tramp_name "
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.type " #tramp_name ",@function
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" #tramp_name ":
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/* Save return pointer */
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stw %r2,-20(%sp)
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/* Save argument registers in the call stack frame. */
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stw %r26,-36(%sp)
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stw %r25,-40(%sp)
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stw %r24,-44(%sp)
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stw %r23,-48(%sp)
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/* Build a call frame. */
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stwm %sp,64(%sp)
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/* Set up args to fixup func. */
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ldw 8+4(%r20),%r26 /* got[1] == struct link_map * */
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copy %r19,%r25 /* reloc offset */
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/* Call the real address resolver. */
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bl " #fixup_name ",%r2
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copy %r21,%r19 /* delay slot, set fixup func ltp */
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ldwm -64(%sp),%sp
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/* Arguments. */
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ldw -36(%sp),%r26
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ldw -40(%sp),%r25
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ldw -44(%sp),%r24
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ldw -48(%sp),%r23
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/* Return pointer. */
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ldw -20(%sp),%r2
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/* Call the real function. */
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ldw 0(%r28),%r22
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bv %r0(%r22)
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ldw 4(%r28),%r19
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");
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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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/* Nonzero iff TYPE describes a relocation that should
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skip the executable when looking up the symbol value. */
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#define elf_machine_lookup_noexec_p(type) ((type) == R_PARISC_COPY)
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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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#define elf_machine_lookup_noplt_p(type) ((type) == R_PARISC_IPLT \
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|| (type) == R_PARISC_EPLT)
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/* Used by ld.so for ... something ... */
|
||||
#define ELF_MACHINE_JMP_SLOT R_PARISC_IPLT
|
||||
|
||||
/* We only use RELA. */
|
||||
#define ELF_MACHINE_NO_REL 1
|
||||
|
||||
#endif /* !dl_machine_h */
|
||||
|
||||
/* These are only actually used where RESOLVE_MAP is defined, anyway. */
|
||||
#ifdef RESOLVE_MAP
|
||||
|
||||
static inline void
|
||||
elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
|
||||
const Elf32_Sym *sym, const struct r_found_version *version,
|
||||
Elf32_Addr *const reloc_addr)
|
||||
{
|
||||
const Elf32_Sym *const refsym = sym;
|
||||
unsigned long const r_type = ELF32_R_TYPE (reloc->r_info);
|
||||
struct link_map *sym_map;
|
||||
Elf32_Addr value;
|
||||
|
||||
#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);
|
||||
#endif
|
||||
|
||||
/* RESOLVE_MAP will return a null value for undefined syms, and
|
||||
non-null for all other syms. In particular, relocs with no
|
||||
symbol (symbol index of zero), also called *ABS* relocs, will be
|
||||
resolved to MAP. (The first entry in a symbol table is all
|
||||
zeros, and an all zero Elf32_Sym has a binding of STB_LOCAL.)
|
||||
See RESOLVE_MAP definition in elf/dl-reloc.c */
|
||||
#ifdef RTLD_BOOTSTRAP
|
||||
/* RESOLVE_MAP in rtld.c doesn't have the local sym test. */
|
||||
sym_map = (ELF32_ST_BIND (sym->st_info) != STB_LOCAL
|
||||
? RESOLVE_MAP (&sym, version, r_type) : map);
|
||||
#else
|
||||
sym_map = RESOLVE_MAP (&sym, version, r_type);
|
||||
#endif
|
||||
if (sym_map)
|
||||
{
|
||||
value = sym ? sym_map->l_addr + sym->st_value : 0;
|
||||
value += reloc->r_addend;
|
||||
}
|
||||
else
|
||||
value = 0;
|
||||
|
||||
switch (r_type)
|
||||
{
|
||||
case R_PARISC_DIR32:
|
||||
#ifndef RTLD_BOOTSTRAP
|
||||
/* All hell breaks loose if we try to relocate these twice,
|
||||
because any initialized variables in ld.so that refer to
|
||||
other ones will have their values reset. In particular,
|
||||
__fptr_next will be reset, sometimes causing endless loops in
|
||||
__hppa_make_fptr(). So don't do that. */
|
||||
if (map == &_dl_rtld_map)
|
||||
return;
|
||||
#endif
|
||||
/* Otherwise, nothing more to do here. */
|
||||
break;
|
||||
|
||||
case R_PARISC_PLABEL32:
|
||||
/* Easy rule: If there is a symbol and it is global, then we
|
||||
need to make a dynamic function descriptor. Otherwise we
|
||||
have the address of a PLT slot for a local symbol which we
|
||||
know to be unique. */
|
||||
if (sym == NULL
|
||||
|| sym_map == NULL
|
||||
|| ELF32_ST_BIND (sym->st_info) == STB_LOCAL)
|
||||
break;
|
||||
|
||||
/* Okay, we need to make ourselves a PLABEL then. See the IA64
|
||||
code for an explanation of how this works. */
|
||||
#ifndef RTLD_BOOTSTRAP
|
||||
value = __hppa_make_fptr (sym_map, value, &__fptr_root, NULL);
|
||||
#else
|
||||
{
|
||||
struct hppa_fptr *p_boot_ldso_fptr;
|
||||
struct hppa_fptr **p_fptr_root;
|
||||
int *p_fptr_count;
|
||||
unsigned long dot;
|
||||
|
||||
/* Go from the top of __boot_ldso_fptr. As on IA64, we
|
||||
probably haven't relocated the necessary values by this
|
||||
point so we have to find them ourselves. */
|
||||
|
||||
asm ("bl 0f,%0
|
||||
depi 0,31,2,%0
|
||||
0: addil L'__boot_ldso_fptr - ($PIC_pcrel$0 - 8),%0
|
||||
ldo R'__boot_ldso_fptr - ($PIC_pcrel$0 - 12)(%%r1),%1
|
||||
addil L'__fptr_root - ($PIC_pcrel$0 - 16),%0
|
||||
ldo R'__fptr_root - ($PIC_pcrel$0 - 20)(%%r1),%2
|
||||
addil L'__fptr_count - ($PIC_pcrel$0 - 24),%0
|
||||
ldo R'__fptr_count - ($PIC_pcrel$0 - 28)(%%r1),%3"
|
||||
:
|
||||
"=r" (dot),
|
||||
"=r" (p_boot_ldso_fptr),
|
||||
"=r" (p_fptr_root),
|
||||
"=r" (p_fptr_count));
|
||||
|
||||
value = __hppa_make_fptr (sym_map, value, p_fptr_root,
|
||||
&p_boot_ldso_fptr[--*p_fptr_count]);
|
||||
}
|
||||
#endif
|
||||
break;
|
||||
|
||||
case R_PARISC_IPLT:
|
||||
if (__builtin_expect (sym_map != NULL, 1))
|
||||
elf_machine_fixup_plt (NULL, sym_map, reloc, reloc_addr, value);
|
||||
else
|
||||
{
|
||||
/* If we get here, it's a (weak) undefined sym. */
|
||||
elf_machine_fixup_plt (NULL, map, reloc, reloc_addr, value);
|
||||
}
|
||||
return;
|
||||
|
||||
case R_PARISC_COPY:
|
||||
if (__builtin_expect (sym == NULL, 0))
|
||||
/* This can happen in trace mode if an object could not be
|
||||
found. */
|
||||
break;
|
||||
if (__builtin_expect (sym->st_size > refsym->st_size, 0)
|
||||
|| (__builtin_expect (sym->st_size < refsym->st_size, 0)
|
||||
&& __builtin_expect (_dl_verbose, 0)))
|
||||
{
|
||||
const char *strtab;
|
||||
|
||||
strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
|
||||
_dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>",
|
||||
": Symbol `", strtab + refsym->st_name,
|
||||
"' has different size in shared object, "
|
||||
"consider re-linking\n", NULL);
|
||||
}
|
||||
memcpy (reloc_addr, (void *) value,
|
||||
MIN (sym->st_size, refsym->st_size));
|
||||
return;
|
||||
|
||||
case R_PARISC_NONE: /* Alright, Wilbur. */
|
||||
return;
|
||||
|
||||
default:
|
||||
_dl_reloc_bad_type (map, r_type, 0);
|
||||
}
|
||||
|
||||
*reloc_addr = value;
|
||||
}
|
||||
|
||||
static inline void
|
||||
elf_machine_lazy_rel (struct link_map *map,
|
||||
Elf32_Addr l_addr, const Elf32_Rela *reloc)
|
||||
{
|
||||
/* We don't have anything to do here. elf_machine_runtime_setup has
|
||||
done all the relocs already. */
|
||||
}
|
||||
|
||||
#endif /* RESOLVE_MAP */
|
Loading…
Reference in New Issue