/* Copyright (C) 2001, 2002, 2003, 2004, 2009 Red Hat, Inc.
   Written by Jakub Jelinek <jakub@redhat.com>, 2001.

* SPDX-License-Identifier: GPL-2.0-or-later
*/

#include <config.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <locale.h>
#include <error.h>
#include <argp.h>
#include <stdlib.h>

#include "prelink.h"
#include "fptr.h"

static int
ia64_adjust_dyn (DSO *dso, int n, GElf_Dyn *dyn, GElf_Addr start,
		 GElf_Addr adjust)
{
  if (dyn->d_tag == DT_IA_64_PLT_RESERVE)
    {
      int sec = addr_to_sec (dso, dyn->d_un.d_ptr);
      Elf64_Addr data;

      if (sec != -1)
	{
	  data = read_ule64 (dso, dyn->d_un.d_ptr + 8);

	  /* If .got[1] points to .plt + 0x30, it needs to be adjusted.  */
	  if (data && data >= start)
	    {
	      int i;

	      for (i = 1; i < dso->ehdr.e_shnum; i++)
		if (data == dso->shdr[i].sh_addr + 0x30
		    && dso->shdr[i].sh_type == SHT_PROGBITS
		    && strcmp (strptr (dso, dso->ehdr.e_shstrndx,
				       dso->shdr[i].sh_name), ".plt") == 0)
		  {
		    write_le64 (dso, dyn->d_un.d_ptr + 8, data + adjust);
		    break;
		  }
	    }
	}

      if (dyn->d_un.d_ptr >= start)
	dyn->d_un.d_ptr += adjust;
      return 1;
    }

  return 0;
}

static int
ia64_adjust_rel (DSO *dso, GElf_Rel *rel, GElf_Addr start,
		 GElf_Addr adjust)
{
  error (0, 0, "%s: IA-64 doesn't support REL relocs", dso->filename);
  return 1;
}

static int
ia64_adjust_rela (DSO *dso, GElf_Rela *rela, GElf_Addr start,
		  GElf_Addr adjust)
{
  if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_REL32MSB
      && rela->r_addend >= start)
    {
      rela->r_addend += adjust;
      switch (GELF_R_TYPE (rela->r_info) & 3)
	{
	case 0: write_be32 (dso, rela->r_offset, rela->r_addend); break;
	case 1: write_le32 (dso, rela->r_offset, rela->r_addend); break;
	case 2: write_be64 (dso, rela->r_offset, rela->r_addend); break;
	case 3: write_le64 (dso, rela->r_offset, rela->r_addend); break;
	}
    }
  else if ((GELF_R_TYPE (rela->r_info) & ~1) == R_IA64_IPLTMSB)
    {
      GElf_Addr val, gp;

      if (GELF_R_TYPE (rela->r_info) & 1)
	{
	  val = read_ule64 (dso, rela->r_offset);
	  gp = read_ule64 (dso, rela->r_offset + 8);
	}
      else
	{
	  val = read_ube64 (dso, rela->r_offset);
	  gp = read_ube64 (dso, rela->r_offset + 8);
	}
      if (gp == dso->info[DT_PLTGOT])
	{
	  if (val >= start)
	    val += adjust;
	  if (gp >= start)
	    gp += adjust;
	}
      if (GELF_R_TYPE (rela->r_info) & 1)
	{
	  write_le64 (dso, rela->r_offset, val);
	  write_le64 (dso, rela->r_offset + 8, gp);
	}
      else
	{
	  write_le64 (dso, rela->r_offset, val);
	  write_le64 (dso, rela->r_offset + 8, gp);
	}
    }
  return 0;
}

static int
ia64_prelink_rel (struct prelink_info *info, GElf_Rel *rel, GElf_Addr reladdr)
{
  error (0, 0, "%s: IA-64 doesn't support REL relocs", info->dso->filename);
  return 1;
}

static int
ia64_prelink_rela (struct prelink_info *info, GElf_Rela *rela,
		   GElf_Addr relaaddr)
{
  DSO *dso;
  GElf_Addr value;

  if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_REL32MSB
      || GELF_R_TYPE (rela->r_info) == R_IA64_NONE)
    /* Fast path: nothing to do.  */
    return 0;
  dso = info->dso;
  value = info->resolve (info, GELF_R_SYM (rela->r_info),
			 GELF_R_TYPE (rela->r_info));
  value += rela->r_addend;
  if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_DIR32MSB)
    {
      /* Nothing to do.  */
    }
  else if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_PCREL32MSB)
    {
      value -= rela->r_offset & -16;
    }
  else if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_FPTR32MSB)
    {
      /* FIXME */
    }
  else if ((GELF_R_TYPE (rela->r_info) & ~1) == R_IA64_IPLTMSB)
    {
      GElf_Addr gp = info->resolveent->pltgot;

      if (GELF_R_TYPE (rela->r_info) & 1)
	{
	  write_le64 (dso, rela->r_offset, value);
	  write_le64 (dso, rela->r_offset + 8, gp);
	}
      else
	{
	  write_be64 (dso, rela->r_offset, value);
	  write_be64 (dso, rela->r_offset + 8, gp);
	}

      return 0;
    }
  else
    {
      error (0, 0, "%s: Unknown ia64 relocation type %d", dso->filename,
	     (int) GELF_R_TYPE (rela->r_info));
      return 1;
    }

  switch (GELF_R_TYPE (rela->r_info) & 3)
    {
    case 0: write_be32 (dso, rela->r_offset, value); break;
    case 1: write_le32 (dso, rela->r_offset, value); break;
    case 2: write_be64 (dso, rela->r_offset, value); break;
    case 3: write_le64 (dso, rela->r_offset, value); break;
    }
  return 0;
}

static int
ia64_apply_conflict_rela (struct prelink_info *info, GElf_Rela *rela,
			  char *buf, GElf_Addr dest_addr)
{
  if ((GELF_R_TYPE (rela->r_info) & ~1) == R_IA64_IPLTMSB)
    {
      GElf_Addr gp = 0;
      int i;

      for (i = 0; i < info->ent->ndepends; ++i)
	if (info->ent->depends[i]->base <= rela->r_addend
	    && info->ent->depends[i]->end > rela->r_addend)
	  {
	    gp = info->ent->depends[i]->pltgot;
	    break;
	  }

      if (i == info->ent->ndepends)
	abort ();

      if (GELF_R_TYPE (rela->r_info) & 1)
	{
	  buf_write_le64 (buf, rela->r_addend);
	  buf_write_le64 (buf + 8, gp);
	}
      else
	{
	  buf_write_be64 (buf, rela->r_addend);
	  buf_write_be64 (buf + 8, gp);
	}
      return 0;
    }

  switch (GELF_R_TYPE (rela->r_info))
    {
    case R_IA64_DIR32MSB: buf_write_be32 (buf, rela->r_addend); break;
    case R_IA64_DIR32LSB: buf_write_le32 (buf, rela->r_addend); break;
    case R_IA64_DIR64MSB: buf_write_be64 (buf, rela->r_addend); break;
    case R_IA64_DIR64LSB: buf_write_le64 (buf, rela->r_addend); break;
    default:
      abort ();
    }
  return 0;
}

static int
ia64_apply_rel (struct prelink_info *info, GElf_Rel *rel, char *buf)
{
  error (0, 0, "%s: IA-64 doesn't support REL relocs", info->dso->filename);
  return 1;
}

static int
ia64_apply_rela (struct prelink_info *info, GElf_Rela *rela, char *buf)
{
  GElf_Addr value;

  value = info->resolve (info, GELF_R_SYM (rela->r_info),
			 GELF_R_TYPE (rela->r_info));
  value += rela->r_addend;
  if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_DIR32MSB)
    {
      /* Nothing to do.  */
    }
  else if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_PCREL32MSB)
    {
      value -= rela->r_offset & -16;
    }
  else if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_FPTR32MSB)
    {
      /* FIXME */
    }
  else if ((GELF_R_TYPE (rela->r_info) & ~1) == R_IA64_IPLTMSB)
    {
      GElf_Addr gp = info->resolveent->pltgot;

      if (GELF_R_TYPE (rela->r_info) & 1)
	{
	  buf_write_le64 (buf, value);
	  buf_write_le64 (buf + 8, gp);
	}
      else
	{
	  buf_write_be64 (buf, value);
	  buf_write_be64 (buf + 8, gp);
	}
      return 0;
    }
  else
    return 1;

  switch (GELF_R_TYPE (rela->r_info) & 3)
    {
    case 0: buf_write_be32 (buf, value); break;
    case 1: buf_write_le32 (buf, value); break;
    case 2: buf_write_be64 (buf, value); break;
    case 3: buf_write_le64 (buf, value); break;
    }
  return 0;
}

static int
ia64_prelink_conflict_rel (DSO *dso, struct prelink_info *info, GElf_Rel *rel,
			   GElf_Addr reladdr)
{
  error (0, 0, "%s: IA-64 doesn't support REL relocs", dso->filename);
  return 1;
}

static int
ia64_prelink_conflict_rela (DSO *dso, struct prelink_info *info,
			    GElf_Rela *rela, GElf_Addr relaaddr)
{
  GElf_Addr value;
  struct prelink_conflict *conflict;
  GElf_Rela *ret;

  if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_REL32MSB
      || GELF_R_TYPE (rela->r_info) == R_IA64_NONE
      || info->dso == dso)
    /* Fast path: nothing to do.  */
    return 0;
  conflict = prelink_conflict (info, GELF_R_SYM (rela->r_info),
			       GELF_R_TYPE (rela->r_info));
  if (conflict == NULL)
    return 0;
  else if (conflict->ifunc)
    {
      error (0, 0, "%s: STT_GNU_IFUNC not handled on IA-64 yet",
	     dso->filename);
      return 1;
    }
  value = conflict_lookup_value (conflict);
  ret = prelink_conflict_add_rela (info);
  if (ret == NULL)
    return 1;
  ret->r_offset = rela->r_offset;
  ret->r_info = GELF_R_INFO (0, GELF_R_TYPE (rela->r_info));
  if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_DIR32MSB
      || (GELF_R_TYPE (rela->r_info) & ~1) == R_IA64_IPLTMSB)
    {
      ret->r_addend = value + rela->r_addend;
      return 0;
    }
  else if ((GELF_R_TYPE (rela->r_info) & ~3) == R_IA64_PCREL32MSB)
    {
      ret->r_addend = value + rela->r_addend - (rela->r_offset & -16);
      ret->r_info = GELF_R_INFO (0, GELF_R_TYPE (rela->r_info)
				    + R_IA64_DIR32MSB - R_IA64_PCREL32MSB);
      return 0;
    }
  else if (GELF_R_TYPE (rela->r_info) == R_IA64_COPY)
    {
      error (0, 0, "R_IA64_COPY should not be present in shared libraries");
      return 1;
    }
  error (0, 0, "%s: Unknown ia64 relocation type %d", dso->filename,
	 (int) GELF_R_TYPE (rela->r_info));
  return 1;
}

static int
ia64_rel_to_rela (DSO *dso, GElf_Rel *rel, GElf_Rela *rela)
{
  error (0, 0, "%s: IA-64 doesn't support REL relocs", dso->filename);
  return 1;
}

static int
ia64_need_rel_to_rela (DSO *dso, int first, int last)
{
  return 0;
}

static GElf_Addr
ia64_create_opd (struct prelink_info *info, int first, int last, int plt)
{
  Elf_Data *d;
  Elf_Scn *scn;
  Elf64_Rela *rela, *relaend;
  DSO *dso = info->dso;
  int sec;

  if (opd_init (info))
    return -1;

  if (plt)
    info->ent->opd->plt_start = dso->shdr[dso->shdr[plt].sh_info].sh_addr;
  else
    info->ent->opd->plt_start = dso->shdr[dso->dynamic].sh_addr;
  sec = first;
  while (sec <= last)
    {
      d = NULL;
      scn = dso->scn[sec++];
      while ((d = elf_getdata (scn, d)) != NULL)
	{
	  rela = (Elf64_Rela *) d->d_buf;
	  relaend = rela + d->d_size / sizeof (Elf64_Rela);
	  for (; rela < relaend; rela++)
	    if ((ELF64_R_TYPE (rela->r_info) & ~3) == R_IA64_FPTR32MSB
		&& opd_add (info, ELF64_R_SYM (rela->r_info),
			    R_IA64_FPTR64LSB))
	      return -1;
	}
    }

  sec = first;
  while (sec)
    {
      d = NULL;
      if (sec == plt)
	break;
      scn = dso->scn[sec++];
      if (sec == last + 1)
	sec = plt;
      while ((d = elf_getdata (scn, d)) != NULL)
	{
	  rela = (Elf64_Rela *) d->d_buf;
	  relaend = rela + d->d_size / sizeof (Elf64_Rela);
	  for (; rela < relaend; rela++)
	    if ((ELF64_R_TYPE (rela->r_info) & ~1) == R_IA64_IPLTMSB)
	      opd_note_plt (info, ELF64_R_SYM (rela->r_info), R_IA64_IPLTLSB,
			    rela->r_offset);
	}
    }

  return opd_size (info, 16);
}

static int
ia64_arch_prelink (struct prelink_info *info)
{
  DSO *dso;
  int plt = -1, got = -1, i;
  const char *name;

  /* Write address of .plt + 0x30 into .got[1].
     .plt + 0x30 is what .IA_64.pltoff[0] contains unless prelinking.  */

  dso = info->dso;
  for (i = 1; i < dso->ehdr.e_shnum; i++)
    if (dso->shdr[i].sh_type == SHT_PROGBITS)
      {
	name = strptr (dso, dso->ehdr.e_shstrndx, dso->shdr[i].sh_name);
	if (! strcmp (name, ".got"))
	  {
	    if (got != -1)
	      {
		error (0, 0, "%s: More than one .got section", dso->filename);
		return 1;
	      }
	    got = i;
	  }
	else if (! strcmp (name, ".plt"))
	  {
	    if (plt != -1)
	      {
		error (0, 0, "%s: More than one .plt section", dso->filename);
		return 1;
	      }
	    plt = i;
	  }
      }

  if (plt == -1)
    return 0;

  if (got == -1)
    {
      error (0, 0, "%s: Has .plt section but not .got section", dso->filename);
      return 1;
    }

  write_le64 (dso, dso->shdr[got].sh_addr + 8, dso->shdr[plt].sh_addr + 0x30);
  return 0;
}

static int
ia64_reloc_size (int reloc_type)
{
  if ((reloc_type & ~1) == R_IA64_IPLTMSB)
    return 16;
  return (reloc_type & 2) ? 8 : 4;
}

static int
ia64_reloc_class (int reloc_type)
{
  switch (reloc_type)
    {
    case R_IA64_IPLTLSB:
    case R_IA64_IPLTMSB:
      return RTYPE_CLASS_PLT;
    default: return RTYPE_CLASS_VALID;
    }
}

PL_ARCH(ia64) = {
  .name = "IA-64",
  .class = ELFCLASS64,
  .machine = EM_IA_64,
  .alternate_machine = { EM_NONE },
  .R_JMP_SLOT = R_IA64_IPLTLSB,
  .R_COPY = -1,
  .R_RELATIVE = R_IA64_REL64LSB,
  .rtype_class_valid = RTYPE_CLASS_VALID,
  .dynamic_linker = "/lib/ld-linux-ia64.so.2",
  .adjust_dyn = ia64_adjust_dyn,
  .adjust_rel = ia64_adjust_rel,
  .adjust_rela = ia64_adjust_rela,
  .prelink_rel = ia64_prelink_rel,
  .prelink_rela = ia64_prelink_rela,
  .prelink_conflict_rel = ia64_prelink_conflict_rel,
  .prelink_conflict_rela = ia64_prelink_conflict_rela,
  .apply_conflict_rela = ia64_apply_conflict_rela,
  .apply_rel = ia64_apply_rel,
  .apply_rela = ia64_apply_rela,
  .rel_to_rela = ia64_rel_to_rela,
  .need_rel_to_rela = ia64_need_rel_to_rela,
  .create_opd = ia64_create_opd,
  .reloc_size = ia64_reloc_size,
  .reloc_class = ia64_reloc_class,
  .max_reloc_size = 16,
  .arch_prelink = ia64_arch_prelink,
  /* Although TASK_UNMAPPED_BASE is 0x2000000000000000, we leave some
     area so that mmap of /etc/ld.so.cache and ld.so's malloc
     does not take some library's VA slot.
     Also, if this guard area isn't too small, typically
     even dlopened libraries will get the slots they desire.  */
  .mmap_base = 0x2000000010000000LL,
  .mmap_end =  0x4000000000000000LL,
  .max_page_size = 0x10000,
  /* The kernel can be configured for 4K, 8K, 16K and 64K,
     but most kernels have at least 8K.  */
  .page_size = 0x02000
};