/* Copyright (C) 2001, 2002, 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"

static int
sparc_adjust_dyn (DSO *dso, int n, GElf_Dyn *dyn, GElf_Addr start,
		  GElf_Addr adjust)
{
  if (dyn->d_tag == DT_PLTGOT)
    {
      int i;

      for (i = 1; i < dso->ehdr.e_shnum; ++i)
	if (! strcmp (strptr (dso, dso->ehdr.e_shstrndx,
			      dso->shdr[i].sh_name), ".got"))
	  {
	    Elf32_Addr data;

	    data = read_ube32 (dso, dso->shdr[i].sh_addr);
	    /* .got[0] points to _DYNAMIC, it needs to be adjusted.  */
	    if (data == dso->shdr[n].sh_addr && data >= start)
	      write_be32 (dso, dso->shdr[i].sh_addr, data + adjust);
	    break;
	  }
    }

  return 0;
}

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

static int
sparc_adjust_rela (DSO *dso, GElf_Rela *rela, GElf_Addr start,
		   GElf_Addr adjust)
{
  if (GELF_R_TYPE (rela->r_info) == R_SPARC_RELATIVE)
    {
      if (rela->r_addend)
	{
	  if ((Elf32_Addr) rela->r_addend >= start)
	    rela->r_addend += (Elf32_Sword) adjust;
	}
      else
	{
	  GElf_Addr val = read_ube32 (dso, rela->r_offset);

	  if (val >= start)
	    write_be32 (dso, rela->r_offset, val + adjust);
	}
    }
  return 0;
}

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

static void
sparc_fixup_plt (DSO *dso, GElf_Rela *rela, GElf_Addr value)
{
  Elf32_Sword disp = value - rela->r_offset;

  if (disp >= -0x800000 && disp < 0x800000)
    {
      /* b,a value
	  nop
	 nop  */
      write_be32 (dso, rela->r_offset, 0x30800000 | ((disp >> 2) & 0x3fffff));
      write_be32 (dso, rela->r_offset + 4, 0x01000000);
      write_be32 (dso, rela->r_offset + 8, 0x01000000);
    }
  else
    {
      /* sethi %hi(value), %g1
	 jmpl %g1 + %lo(value), %g0
	  nop  */
      write_be32 (dso, rela->r_offset, 0x03000000 | ((value >> 10) & 0x3fffff));
      write_be32 (dso, rela->r_offset + 4, 0x81c06000 | (value & 0x3ff));
      write_be32 (dso, rela->r_offset + 8, 0x01000000);
    }
}

static int
sparc_prelink_rela (struct prelink_info *info, GElf_Rela *rela,
		    GElf_Addr relaaddr)
{
  DSO *dso = info->dso;
  GElf_Addr value;

  if (GELF_R_TYPE (rela->r_info) == R_SPARC_NONE)
    return 0;
  else if (GELF_R_TYPE (rela->r_info) == R_SPARC_RELATIVE)
    {
      /* 32-bit SPARC handles RELATIVE relocs as
	 *(int *)rela->r_offset += l_addr + rela->r_addend.
	 RELATIVE relocs against .got traditionally used to have the
	 addend in memory pointed by r_offset and 0 r_addend,
	 other RELATIVE relocs and more recent .got RELATIVE relocs
	 too have 0 in memory and non-zero r_addend.  For prelinking,
	 we need the value in memory to be already relocated for
	 l_addr == 0 case, so we have to make sure r_addend will be 0.  */
      if (rela->r_addend == 0)
	return 0;
      value = read_ube32 (dso, rela->r_offset);
      value += rela->r_addend;
      rela->r_addend = 0;
      write_be32 (dso, rela->r_offset, value);
      /* Tell prelink_rela routine it should update the relocation.  */
      return 2;
    }
  value = info->resolve (info, GELF_R_SYM (rela->r_info),
			 GELF_R_TYPE (rela->r_info));
  value += rela->r_addend;
  switch (GELF_R_TYPE (rela->r_info))
    {
    case R_SPARC_GLOB_DAT:
    case R_SPARC_32:
    case R_SPARC_UA32:
      write_be32 (dso, rela->r_offset, value);
      break;
    case R_SPARC_JMP_SLOT:
      sparc_fixup_plt (dso, rela, value);
      break;
    case R_SPARC_8:
      write_8 (dso, rela->r_offset, value);
      break;
    case R_SPARC_16:
    case R_SPARC_UA16:
      write_be16 (dso, rela->r_offset, value);
      break;
    case R_SPARC_LO10:
      write_be32 (dso, rela->r_offset,
		  (value & 0x3ff) | (read_ube32 (dso, rela->r_offset) & ~0x3ff));
      break;
    case R_SPARC_HI22:
      write_be32 (dso, rela->r_offset,
		  ((value >> 10) & 0x3fffff)
		  | (read_ube32 (dso, rela->r_offset) & 0xffc00000));
      break;
    case R_SPARC_DISP8:
      write_8 (dso, rela->r_offset, value - rela->r_offset);
      break;
    case R_SPARC_DISP16:
      write_be16 (dso, rela->r_offset, value - rela->r_offset);
      break;
    case R_SPARC_DISP32:
      write_be32 (dso, rela->r_offset, value - rela->r_offset);
      break;
    case R_SPARC_WDISP30:
      write_be32 (dso, rela->r_offset,
		  (((value - rela->r_offset) >> 2) & 0x3fffffff)
		  | (read_ube32 (dso, rela->r_offset) & 0xc0000000));
      break;
    case R_SPARC_TLS_DTPOFF32:
      write_be32 (dso, rela->r_offset, value + rela->r_addend);
      break;
    /* DTPMOD32 and TPOFF32 is impossible to predict in shared libraries
       unless prelink sets the rules.  */
    case R_SPARC_TLS_DTPMOD32:
      if (dso->ehdr.e_type == ET_EXEC)
	{
	  error (0, 0, "%s: R_SPARC_TLS_DTPMOD32 reloc in executable?",
		 dso->filename);
	  return 1;
	}
      break;
    case R_SPARC_TLS_TPOFF32:
      if (dso->ehdr.e_type == ET_EXEC && info->resolvetls)
	write_be32 (dso, rela->r_offset,
		    value + rela->r_addend - info->resolvetls->offset);
      break;
    case R_SPARC_TLS_LE_HIX22:
      if (dso->ehdr.e_type == ET_EXEC && info->resolvetls)
	write_be32 (dso, rela->r_offset,
		    (read_ube32 (dso, rela->r_offset) & 0xffc00000)
		    | (((~(value + rela->r_addend - info->resolvetls->offset))
			>> 10) & 0x3fffff));
      break;
    case R_SPARC_TLS_LE_LOX10:
      if (dso->ehdr.e_type == ET_EXEC && info->resolvetls)
	write_be32 (dso, rela->r_offset,
		    (read_ube32 (dso, rela->r_offset) & 0xffffe000) | 0x1c00
		    | ((value + rela->r_addend - info->resolvetls->offset)
		       & 0x3ff));
      break;
    case R_SPARC_COPY:
      if (dso->ehdr.e_type == ET_EXEC)
	/* COPY relocs are handled specially in generic code.  */
	return 0;
      error (0, 0, "%s: R_SPARC_COPY reloc in shared library?", dso->filename);
      return 1;
    default:
      error (0, 0, "%s: Unknown sparc relocation type %d", dso->filename,
	     (int) GELF_R_TYPE (rela->r_info));
      return 1;
    }
  return 0;
}

static int
sparc_apply_conflict_rela (struct prelink_info *info, GElf_Rela *rela,
			   char *buf, GElf_Addr dest_addr)
{
  switch (GELF_R_TYPE (rela->r_info))
    {
    case R_SPARC_32:
    case R_SPARC_UA32:
      buf_write_be32 (buf, rela->r_addend);
      break;
    case R_SPARC_16:
    case R_SPARC_UA16:
      buf_write_be16 (buf, rela->r_addend);
      break;
    case R_SPARC_8:
      buf_write_8 (buf, rela->r_addend);
      break;
    default:
      abort ();
    }
  return 0;
}

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

static int
sparc_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;
  switch (GELF_R_TYPE (rela->r_info))
    {
    case R_SPARC_NONE:
      break;
    case R_SPARC_DISP32:
      value -= rela->r_offset;
    case R_SPARC_GLOB_DAT:
    case R_SPARC_32:
    case R_SPARC_UA32:
      buf_write_be32 (buf, value);
      break;
    case R_SPARC_DISP16:
      value -= rela->r_offset;
    case R_SPARC_16:
    case R_SPARC_UA16:
      buf_write_be16 (buf, value);
      break;
    case R_SPARC_DISP8:
      value -= rela->r_offset;
    case R_SPARC_8:
      buf_write_8 (buf, value);
      break;
    case R_SPARC_LO10:
      buf_write_be32 (buf, (buf_read_ube32 (buf) & ~0x3ff) | (value & 0x3ff));
      break;
    case R_SPARC_HI22:
      buf_write_be32 (buf, (buf_read_ube32 (buf) & 0xffc00000)
			   | ((value >> 10) & 0x3fffff));
      break;
    case R_SPARC_WDISP30:
      buf_write_be32 (buf, (buf_read_ube32 (buf) & 0xc0000000)
			   | (((value - rela->r_offset) >> 2) & 0x3fffffff));
      break;
    case R_SPARC_RELATIVE:
      error (0, 0, "%s: R_SPARC_RELATIVE in ET_EXEC object?",
	     info->dso->filename);
      return 1;
    default:
      return 1;
    }
  return 0;
}

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

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

  if (GELF_R_TYPE (rela->r_info) == R_SPARC_RELATIVE
      || GELF_R_TYPE (rela->r_info) == R_SPARC_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)
    {
      if (info->curtls == NULL)
	return 0;
      switch (GELF_R_TYPE (rela->r_info))
	{
	/* Even local DTPMOD32 and TPOFF32 relocs need conflicts.  */
	case R_SPARC_TLS_DTPMOD32:
	case R_SPARC_TLS_TPOFF32:
	case R_SPARC_TLS_LE_HIX22:
	case R_SPARC_TLS_LE_LOX10:
	  break;
	default:
	  return 0;
	}
      value = 0;
    }
  else if (conflict->ifunc)
    {
      error (0, 0, "%s: STT_GNU_IFUNC not handled on SPARC yet",
	     dso->filename);
      return 1;
    }
  else
    {
      /* DTPOFF32 wants to see only real conflicts, not lookups
	 with reloc_class RTYPE_CLASS_TLS.  */
      if (GELF_R_TYPE (rela->r_info) == R_SPARC_TLS_DTPOFF32
	  && conflict->lookup.tls == conflict->conflict.tls
	  && conflict->lookupval == conflict->conflictval)
	return 0;

      value = conflict_lookup_value (conflict);
    }
  ret = prelink_conflict_add_rela (info);
  if (ret == NULL)
    return 1;
  ret->r_offset = rela->r_offset;
  value += rela->r_addend;
  r_type = GELF_R_TYPE (rela->r_info);
  switch (r_type)
    {
    case R_SPARC_DISP32:
      value -= rela->r_offset;
    case R_SPARC_GLOB_DAT:
    case R_SPARC_32:
      r_type = R_SPARC_32;
      break;
    case R_SPARC_DISP16:
      value -= rela->r_offset;
    case R_SPARC_16:
      r_type = R_SPARC_16;
      break;
    case R_SPARC_DISP8:
      value -= rela->r_offset;
    case R_SPARC_8:
      r_type = R_SPARC_8;
      break;
    /* Attempt to transform all reloc which read-modify-write into
       simple writes.  */
    case R_SPARC_LO10:
      value = (read_ube32 (dso, rela->r_offset) & ~0x3ff) | (value & 0x3ff);
      r_type = R_SPARC_32;
      break;
    case R_SPARC_HI22:
      value = (read_ube32 (dso, rela->r_offset) & 0xffc00000)
	      | ((value >> 10) & 0x3fffff);
      r_type = R_SPARC_32;
      break;
    case R_SPARC_WDISP30:
      value = (read_ube32 (dso, rela->r_offset) & 0xc0000000)
	      | (((value - rela->r_offset) >> 2) & 0x3fffffff);
      r_type = R_SPARC_32;
      break;
    case R_SPARC_UA16:
    case R_SPARC_UA32:
    case R_SPARC_JMP_SLOT:
      break;
    case R_SPARC_TLS_DTPMOD32:
    case R_SPARC_TLS_DTPOFF32:
    case R_SPARC_TLS_TPOFF32:
    case R_SPARC_TLS_LE_HIX22:
    case R_SPARC_TLS_LE_LOX10:
      if (conflict != NULL
	  && (conflict->reloc_class != RTYPE_CLASS_TLS
	      || conflict->lookup.tls == NULL))
	{
	  error (0, 0, "%s: TLS reloc not resolving to STT_TLS symbol",
		 dso->filename);
	  return 1;
	}
      r_type = R_SPARC_32;
      tls = conflict ? conflict->lookup.tls : info->curtls;
      switch (GELF_R_TYPE (rela->r_info))
	{
	case R_SPARC_TLS_DTPMOD32:
	  value = tls->modid;
	  break;
	case R_SPARC_TLS_DTPOFF32:
	  break;
	case R_SPARC_TLS_TPOFF32:
	  value -= tls->offset;
	  break;
	case R_SPARC_TLS_LE_HIX22:
	  value -= tls->offset;
	  value = (read_ube32 (dso, rela->r_offset) & 0xffc00000)
		  | (((~value) >> 10) & 0x3fffff);
	  break;
	case R_SPARC_TLS_LE_LOX10:
	  value -= tls->offset;
	  value = (read_ube32 (dso, rela->r_offset) & 0xffffe000) | 0x1c00
		  | (value & 0x3ff);
	  break;
	}
      break;
    default:
      error (0, 0, "%s: Unknown Sparc relocation type %d", dso->filename,
	     r_type);
      return 1;
    }
  ret->r_info = GELF_R_INFO (0, r_type);
  ret->r_addend = (Elf32_Sword) value;
  return 0;
}

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

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

static int
sparc_arch_prelink (struct prelink_info *info)
{
  return 0;
}

static int
sparc_undo_prelink_rela (DSO *dso, GElf_Rela *rela, GElf_Addr relaaddr)
{
  int sec;

  switch (GELF_R_TYPE (rela->r_info))
    {
    case R_SPARC_NONE:
      return 0;
    case R_SPARC_RELATIVE:
      /* 32-bit SPARC handles RELATIVE relocs as
	 *(int *)rela->r_offset += l_addr + rela->r_addend.
	 RELATIVE relocs against .got traditionally used to have the
	 addend in memory pointed by r_offset and 0 r_addend,
	 other RELATIVE relocs and more recent RELATIVE relocs have 0
	 in memory and non-zero r_addend.
	 Always store 0 to memory when doing undo.  */
      assert (rela->r_addend == 0);
      rela->r_addend = (Elf32_Sword) read_ube32 (dso, rela->r_offset);
      write_be32 (dso, rela->r_offset, 0);
      /* Tell undo_prelink_rela routine it should update the
	 relocation.  */
      return 2;
    case R_SPARC_GLOB_DAT:
    case R_SPARC_32:
    case R_SPARC_UA32:
    case R_SPARC_DISP32:
    case R_SPARC_TLS_DTPMOD32:
    case R_SPARC_TLS_DTPOFF32:
    case R_SPARC_TLS_TPOFF32:
      write_be32 (dso, rela->r_offset, 0);
      break;
    case R_SPARC_JMP_SLOT:
      sec = addr_to_sec (dso, rela->r_offset);
      if (sec != -1)
	{
	  /* sethi .-.plt, %g1
	     b,a .plt+0  */
	  write_be32 (dso, rela->r_offset,
		      0x03000000
		      | ((rela->r_offset - dso->shdr[sec].sh_addr)
			 & 0x3fffff));
	  write_be32 (dso, rela->r_offset + 4,
		      0x30800000
		      | (((dso->shdr[sec].sh_addr - rela->r_offset - 4) >> 2)
			 & 0x3fffff));
	}
      break;
    case R_SPARC_8:
    case R_SPARC_DISP8:
      write_8 (dso, rela->r_offset, 0);
      break;
    case R_SPARC_16:
    case R_SPARC_UA16:
    case R_SPARC_DISP16:
      write_be16 (dso, rela->r_offset, 0);
      break;
    case R_SPARC_LO10:
      write_be32 (dso, rela->r_offset,
		  read_ube32 (dso, rela->r_offset) & ~0x3ff);
      break;
    case R_SPARC_TLS_LE_LOX10:
      write_be32 (dso, rela->r_offset,
		  read_ube32 (dso, rela->r_offset) & 0xffffe000);
      break;
    case R_SPARC_HI22:
    case R_SPARC_TLS_LE_HIX22:
      write_be32 (dso, rela->r_offset,
		  read_ube32 (dso, rela->r_offset) & 0xffc00000);
      break;
    case R_SPARC_WDISP30:
      write_be32 (dso, rela->r_offset,
		  read_ube32 (dso, rela->r_offset) & 0xc0000000);
      break;
    case R_SPARC_COPY:
      if (dso->ehdr.e_type == ET_EXEC)
	/* COPY relocs are handled specially in generic code.  */
	return 0;
      error (0, 0, "%s: R_SPARC_COPY reloc in shared library?", dso->filename);
      return 1;
    default:
      error (0, 0, "%s: Unknown sparc relocation type %d", dso->filename,
	     (int) GELF_R_TYPE (rela->r_info));
      return 1;
    }
  return 0;
}

static int
sparc_reloc_size (int reloc_type)
{
  switch (reloc_type)
    {
    case R_SPARC_8:
    case R_SPARC_DISP8:
      return 1;
    case R_SPARC_16:
    case R_SPARC_DISP16:
    case R_SPARC_UA16:
      return 2;
    default:
      break;
    }
  return 4;
}

static int
sparc_reloc_class (int reloc_type)
{
  switch (reloc_type)
    {
    case R_SPARC_COPY: return RTYPE_CLASS_COPY;
    case R_SPARC_JMP_SLOT: return RTYPE_CLASS_PLT;
    case R_SPARC_TLS_DTPMOD32:
    case R_SPARC_TLS_DTPOFF32:
    case R_SPARC_TLS_TPOFF32:
    case R_SPARC_TLS_LE_HIX22:
    case R_SPARC_TLS_LE_LOX10:
      return RTYPE_CLASS_TLS;
    default: return RTYPE_CLASS_VALID;
    }
}

PL_ARCH(sparc) = {
  .name = "SPARC",
  .class = ELFCLASS32,
  .machine = EM_SPARC,
  .alternate_machine = { EM_SPARC32PLUS },
  .R_JMP_SLOT = R_SPARC_JMP_SLOT,
  .R_COPY = R_SPARC_COPY,
  .R_RELATIVE = R_SPARC_RELATIVE,
  .rtype_class_valid = RTYPE_CLASS_VALID,
  .dynamic_linker = "/lib/ld-linux.so.2",
  .adjust_dyn = sparc_adjust_dyn,
  .adjust_rel = sparc_adjust_rel,
  .adjust_rela = sparc_adjust_rela,
  .prelink_rel = sparc_prelink_rel,
  .prelink_rela = sparc_prelink_rela,
  .prelink_conflict_rel = sparc_prelink_conflict_rel,
  .prelink_conflict_rela = sparc_prelink_conflict_rela,
  .apply_conflict_rela = sparc_apply_conflict_rela,
  .apply_rel = sparc_apply_rel,
  .apply_rela = sparc_apply_rela,
  .rel_to_rela = sparc_rel_to_rela,
  .need_rel_to_rela = sparc_need_rel_to_rela,
  .reloc_size = sparc_reloc_size,
  .reloc_class = sparc_reloc_class,
  .max_reloc_size = 4,
  .arch_prelink = sparc_arch_prelink,
  .undo_prelink_rela = sparc_undo_prelink_rela,
  /* Although TASK_UNMAPPED_BASE is 0x70000000, 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 = 0x71000000LL,
  .mmap_end =  0x80000000LL,
  .max_page_size = 0x10000,
  .page_size = 0x1000
};