From d9947f2dc0c2cd812f8e64380d5f6f53705a5280 Mon Sep 17 00:00:00 2001

From: Mark Wielaard <mark@klomp.org>

Date: Tue, 19 Jan 2021 04:12:33 +0100

Subject: [PATCH 6/6] debugedit: Handle DWARF-5 debug_line and debug_line_str.

Handle the new DWARF5 .debug_line tables and the new DW_FORM_line_strp.

DWARF5 tables are handled separately from the earlier tables. They

will never change size, but they do need updates to the .debug_str

or .debug_line_str references.

Based on a patch from Jan Kratochvil <jan.kratochvil@redhat.com>

---

 tools/debugedit.c | 471 ++++++++++++++++++++++++++++++++++++++++------

 1 file changed, 410 insertions(+), 61 deletions(-)

diff --git a/tools/debugedit.c b/tools/debugedit.c

index be5fee85b..d6a0058e9 100644

--- a/tools/debugedit.c

+++ b/tools/debugedit.c

@@ -103,6 +103,8 @@ static bool need_string_replacement = false;

 /* Whether we need to do any updates of the string indexes (DW_FORM_strp)

    in debug_info for string indexes. */

 static bool need_strp_update = false;

+/* Likewise for DW_FORM_line_strp. */

+static bool need_line_strp_update = false;

 /* If the debug_line changes size we will need to update the

    DW_AT_stmt_list attributes indexes in the debug_info. */

 static bool need_stmt_update = false;

@@ -192,7 +194,7 @@ typedef struct

   const char *filename;

   int lastscn;

   size_t phnum;

-  struct strings strings;

+  struct strings debug_str, debug_line_str;

   struct debug_lines lines;

   GElf_Shdr shdr[0];

 } DSO;

@@ -553,10 +555,11 @@ setup_relbuf (DSO *dso, debug_section *sec, int *reltype)

       /* Relocations against section symbols are uninteresting in REL.  */

       if (dso->shdr[i].sh_type == SHT_REL && sym.st_value == 0)

 	continue;

-      /* Only consider relocations against .debug_str, .debug_line

-	 and .debug_abbrev.  */

+      /* Only consider relocations against .debug_str, .debug_line,

+	 .debug_line_str, and .debug_abbrev.  */

       if (sym.st_shndx != debug_sections[DEBUG_STR].sec

 	  && sym.st_shndx != debug_sections[DEBUG_LINE].sec

+	  && sym.st_shndx != debug_sections[DEBUG_LINE_STR].sec

 	  && sym.st_shndx != debug_sections[DEBUG_ABBREV].sec)

 	continue;

       rela.r_addend += sym.st_value;

@@ -768,6 +771,7 @@ no_memory:

 	      || (form > DW_FORM_flag_present

 		  && !(form == DW_FORM_ref_sig8

 		       || form == DW_FORM_data16

+		       || form == DW_FORM_line_strp

 		       || form == DW_FORM_implicit_const

 		       || form == DW_FORM_addrx

 		       || form == DW_FORM_loclistx

@@ -1049,17 +1053,20 @@ string_find_entry (struct strings *strings, size_t old_idx)

    a replacement file string has been recorded for it, otherwise

    returns false.  */

 static bool

-record_file_string_entry_idx (struct strings *strings, size_t old_idx)

+record_file_string_entry_idx (bool line_strp, DSO *dso, size_t old_idx)

 {

+  struct strings *strings = line_strp ? &dso->debug_line_str : &dso->debug_str;

   bool ret = false;

   struct stridxentry *entry = string_find_new_entry (strings, old_idx);

   if (entry != NULL)

     {

-      if (old_idx >= debug_sections[DEBUG_STR].size)

-	error (1, 0, "Bad string pointer index %zd", old_idx);

+      debug_section *sec = &debug_sections[line_strp

+					   ? DEBUG_LINE_STR : DEBUG_STR];

+      if (old_idx >= sec->size)

+	error (1, 0, "Bad string pointer index %zd (%s)", old_idx, sec->name);

       Strent *strent;

-      const char *old_str = (char *)debug_sections[DEBUG_STR].data + old_idx;

+      const char *old_str = (char *)sec->data + old_idx;

       const char *file = skip_dir_prefix (old_str, base_dir);

       if (file == NULL)

 	{

@@ -1103,15 +1110,18 @@ record_file_string_entry_idx (struct strings *strings, size_t old_idx)

    base_dir with dest_dir, just records the existing string associated

    with the index. */

 static void

-record_existing_string_entry_idx (struct strings *strings, size_t old_idx)

+record_existing_string_entry_idx (bool line_strp, DSO *dso, size_t old_idx)

 {

+  struct strings *strings = line_strp ? &dso->debug_line_str : &dso->debug_str;

   struct stridxentry *entry = string_find_new_entry (strings, old_idx);

   if (entry != NULL)

     {

-      if (old_idx >= debug_sections[DEBUG_STR].size)

-	error (1, 0, "Bad string pointer index %zd", old_idx);

+      debug_section *sec = &debug_sections[line_strp

+					   ? DEBUG_LINE_STR : DEBUG_STR];

+      if (old_idx >= sec->size)

+	error (1, 0, "Bad string pointer index %zd (%s)", old_idx, sec->name);

-      const char *str = (char *)debug_sections[DEBUG_STR].data + old_idx;

+      const char *str = (char *)sec->data + old_idx;

       Strent *strent = strtab_add_len (strings->str_tab,

 				       str, strlen (str) + 1);

       if (strent == NULL)

@@ -1244,13 +1254,28 @@ get_line_table (DSO *dso, size_t off, struct line_table **table)

   /* version */

   t->version = read_16 (ptr);

-  if (t->version != 2 && t->version != 3 && t->version != 4)

+  if (t->version != 2 && t->version != 3 && t->version != 4 && t->version != 5)

     {

       error (0, 0, "%s: DWARF version %d unhandled", dso->filename,

 	     t->version);

       return false;

     }

+  if (t->version >= 5)

+    {

+      /* address_size */

+      assert (ptr_size != 0);

+      if (ptr_size != read_8 (ptr))

+	{

+	  error (0, 0, "%s: .debug_line address size differs from .debug_info",

+		 dso->filename);

+	  return false;

+	}

+

+      /* segment_selector_size */

+      (void) read_8 (ptr);

+    }

+

   /* header_length */

   unsigned char *endprol = ptr + 4;

   t->header_length = read_32 (ptr);

@@ -1343,7 +1368,9 @@ edit_dwarf2_line (DSO *dso)

   linedata->d_size = dso->lines.debug_lines_len;

   linedata->d_buf = dso->lines.line_buf;

+  debug_sections[DEBUG_LINE].data = linedata->d_buf;

   debug_sections[DEBUG_LINE].size = linedata->d_size;

+  debug_sections[DEBUG_LINE].elf_data = linedata;

   /* Make sure the line tables are sorted on the old index. */

   qsort (dso->lines.table, dso->lines.used, sizeof (struct line_table),

@@ -1483,9 +1510,10 @@ edit_dwarf2_line (DSO *dso)

     }

 }

-/* Record or adjust (according to phase) DW_FORM_strp.  */

+/* Record or adjust (according to phase) DW_FORM_strp or DW_FORM_line_strp.  */

 static void

-edit_strp (DSO *dso, unsigned char *ptr, int phase, bool handled_strp)

+edit_strp (DSO *dso, bool line_strp, unsigned char *ptr, int phase,

+	   bool handled_strp)

 {

   unsigned char *ptr_orig = ptr;

@@ -1500,15 +1528,18 @@ edit_strp (DSO *dso, unsigned char *ptr, int phase, bool handled_strp)

       if (! handled_strp)

 	{

 	  size_t idx = do_read_32_relocated (ptr);

-	  record_existing_string_entry_idx (&dso->strings, idx);

+	  record_existing_string_entry_idx (line_strp, dso, idx);

 	}

     }

-  else if (need_strp_update) /* && phase == 1 */

+  else if (line_strp

+	   ? need_line_strp_update : need_strp_update) /* && phase == 1 */

     {

       struct stridxentry *entry;

       size_t idx, new_idx;

+      struct strings *strings = (line_strp

+				 ? &dso->debug_line_str : &dso->debug_str);

       idx = do_read_32_relocated (ptr);

-      entry = string_find_entry (&dso->strings, idx);

+      entry = string_find_entry (strings, idx);

       new_idx = strent_offset (entry->entry);

       do_write_32_relocated (ptr, new_idx);

     }

@@ -1759,6 +1790,254 @@ read_dwarf4_line (DSO *dso, unsigned char *ptr, char *comp_dir,

   return true;

 }

+/* Called by read_dwarf5_line first for directories and then file

+   names as they both have the same format.  */

+static bool

+read_dwarf5_line_entries (DSO *dso, unsigned char **ptrp,

+			  struct line_table *table, int phase,

+			  char ***dirs, int *ndir,

+			  const char *entry_name)

+{

+  /* directory_entry_format_count */

+  /* file_name_entry_format_count */

+  unsigned format_count = read_8 (*ptrp);

+

+  unsigned char *formats = *ptrp;

+

+  /* directory_entry_format */

+  /* file_name_entry_format */

+  for (unsigned formati = 0; formati < format_count; ++formati)

+    {

+      read_uleb128 (*ptrp);

+      read_uleb128 (*ptrp);

+    }

+

+  /* directories_count */

+  /* file_names_count */

+  unsigned entry_count = read_uleb128 (*ptrp);

+

+  bool collecting_dirs = dest_dir && phase == 0 && *dirs == NULL;

+  bool writing_files = dest_dir && phase == 0 && *dirs != NULL;

+  if (collecting_dirs)

+    {

+      *ndir = entry_count;

+      *dirs = malloc (entry_count * sizeof (char *));

+      if (*dirs == NULL)

+	error (1, errno, "%s: Could not allocate debug_line dirs",

+	       dso->filename);

+    }

+

+  /* directories */

+  /* file_names */

+  for (unsigned entryi = 0; entryi < entry_count; ++entryi)

+    {

+      char *dir = NULL;

+      char *file = NULL;;

+      unsigned char *format_ptr = formats;

+      for (unsigned formati = 0; formati < format_count; ++formati)

+	{

+	  unsigned lnct = read_uleb128 (format_ptr);

+	  unsigned form = read_uleb128 (format_ptr);

+	  bool handled_form = false;

+	  bool handled_strp = false;

+	  bool line_strp = form == DW_FORM_line_strp;

+	  if (lnct == DW_LNCT_path)

+	    {

+	      switch (form)

+		{

+		case DW_FORM_strp:

+		case DW_FORM_line_strp:

+		  if (dest_dir && phase == 0)

+		    {

+		      size_t idx = do_read_32_relocated (*ptrp);

+		      if (record_file_string_entry_idx (line_strp, dso, idx))

+			{

+			  if (line_strp)

+			    need_line_strp_update = true;

+			  else

+			    need_strp_update = true;

+			}

+		      handled_strp = true;

+		      if (collecting_dirs || writing_files)

+			{

+			  debug_section *sec = &debug_sections[line_strp

+                                           ? DEBUG_LINE_STR : DEBUG_STR];

+			  if (collecting_dirs)

+			    dir = (char *)sec->data + idx;

+			  if (writing_files)

+			    file = (char *)sec->data + idx;

+			}

+		    }

+		  break;

+		default:

+		  error (0, 0, "%s: Unsupported "

+			 ".debug_line %s %u path DW_FORM_0x%x",

+			 dso->filename, entry_name, entryi, form);

+		  return false;

+		}

+	    }

+	  if (writing_files && lnct == DW_LNCT_directory_index)

+	    {

+	      int dirndx;

+	      switch (form)

+		{

+		case DW_FORM_udata:

+		  handled_form = true;

+		  dirndx = read_uleb128 (*ptrp);

+		  break;

+		case DW_FORM_data1:

+		  dirndx = **ptrp;

+		  break;

+		case DW_FORM_data2:

+		  dirndx = do_read_16 (*ptrp);

+		  break;

+		case DW_FORM_data4:

+		  dirndx = do_read_32 (*ptrp);

+		  break;

+		default:

+		  error (0, 0, "%s: Unsupported "

+			 ".debug_line %s %u dirndx DW_FORM_0x%x",

+			 dso->filename, entry_name, entryi, form);

+		  return false;

+		}

+

+	      if (dirndx > *ndir)

+		{

+		  error (0, 0, "%s: Bad dir number %u in .debug_line %s",

+			 dso->filename, entryi, entry_name);

+		  return false;

+		}

+	      dir = (*dirs)[dirndx];

+	    }

+

+	  switch (form)

+	    {

+	    case DW_FORM_strp:

+	    case DW_FORM_line_strp:

+	      edit_strp (dso, line_strp, *ptrp, phase, handled_strp);

+	      break;

+	    }

+

+	  if (!handled_form)

+	    {

+	      switch (skip_form (dso, &form, ptrp))

+		{

+		case FORM_OK:

+		  break;

+		case FORM_ERROR:

+		  return false;

+		case FORM_INDIRECT:

+		  error (0, 0, "%s: Unsupported "

+			 ".debug_line %s %u DW_FORM_indirect",

+			 dso->filename, entry_name, entryi);

+		  return false;

+		}

+	    }

+	}

+

+      if (collecting_dirs)

+	(*dirs)[entryi] = dir;

+

+      if (writing_files)

+	{

+	  char *comp_dir = (*dirs)[0];

+	  size_t comp_dir_len = strlen(comp_dir);

+	  size_t file_len = strlen (file);

+	  size_t dir_len = strlen (dir);

+

+	  char *s = malloc (comp_dir_len + 1 + file_len + 1 + dir_len + 1);

+	  if (s == NULL)

+	    {

+	      error (0, ENOMEM, "%s: Reading file table", dso->filename);

+	      return false;

+	    }

+	  if (file[0] == '/')

+	    {

+	      memcpy (s, file, file_len + 1);

+	    }

+	  else if (dir[0] == '/')

+	    {

+	      memcpy (s, dir, dir_len);

+	      s[dir_len] = '/';

+	      memcpy (s + dir_len + 1, file, file_len + 1);

+	    }

+	  else

+	    {

+	      char *p = s;

+	      if (comp_dir_len != 0)

+		{

+		  memcpy (s, comp_dir, comp_dir_len);

+		  s[comp_dir_len] = '/';

+		  p += comp_dir_len + 1;

+		}

+	      memcpy (p, dir, dir_len);

+	      p[dir_len] = '/';

+	      memcpy (p + dir_len + 1, file, file_len + 1);

+	    }

+	  canonicalize_path (s, s);

+	  if (list_file_fd != -1)

+	    {

+	      const char *p = NULL;

+	      if (base_dir == NULL)

+		p = s;

+	      else

+		{

+		  p = skip_dir_prefix (s, base_dir);

+		  if (p == NULL && dest_dir != NULL)

+		    p = skip_dir_prefix (s, dest_dir);

+		}

+

+	      if (p)

+		{

+		  size_t size = strlen (p) + 1;

+		  while (size > 0)

+		    {

+		      ssize_t ret = write (list_file_fd, p, size);

+		      if (ret == -1)

+			break;

+		      size -= ret;

+		      p += ret;

+		    }

+		}

+	    }

+

+	  free (s);

+	}

+    }

+

+  return true;

+}

+

+/* Part of read_dwarf2_line processing DWARF-5.  */

+static bool

+read_dwarf5_line (DSO *dso, unsigned char *ptr, struct line_table *table,

+		  int phase)

+{

+  char **dirs = NULL;

+  int ndir;

+  /* Skip header.  */

+  ptr += (4 /* unit len */

+          + 2 /* version */

+          + (table->version < 5 ? 0 : 0

+             + 1 /* address_size */

+             + 1 /* segment_selector*/)

+          + 4 /* header len */

+          + 1 /* min instr len */

+          + (table->version >= 4) /* max op per instr, if version >= 4 */

+          + 1 /* default is stmt */

+          + 1 /* line base */

+          + 1 /* line range */

+          + 1 /* opcode base */

+          + table->opcode_base - 1); /* opcode len table */

+

+  bool retval = (read_dwarf5_line_entries (dso, &ptr, table, phase,

+					   &dirs, &ndir, "directory")

+		 && read_dwarf5_line_entries (dso, &ptr, table, phase,

+					      &dirs, &ndir, "file name"));

+  free (dirs);

+  return retval;

+}

+

 /* Called during phase zero for each debug_line table referenced from

    .debug_info.  Outputs all source files seen and records any

    adjustments needed in the debug_list data structures. Returns true

@@ -1778,6 +2057,9 @@ read_dwarf2_line (DSO *dso, uint32_t off, char *comp_dir)

   ptr = debug_sections[DEBUG_LINE].data + off;

   ptr += (4 /* unit len */

 	  + 2 /* version */

+	  + (table->version < 5 ? 0 : 0

+	     + 1 /* address_size */

+	     + 1 /* segment_selector*/)

 	  + 4 /* header len */

 	  + 1 /* min instr len */

 	  + (table->version >= 4) /* max op per instr, if version >= 4 */

@@ -1787,8 +2069,13 @@ read_dwarf2_line (DSO *dso, uint32_t off, char *comp_dir)

 	  + 1 /* opcode base */

 	  + table->opcode_base - 1); /* opcode len table */

-  if (! read_dwarf4_line (dso, ptr, comp_dir, table))

-   return false;

+  /* DWARF version 5 line tables won't change size. But they might need

+     [line]strp recording/updates. Handle that part later.  */

+  if (table->version < 5)

+    {

+      if (! read_dwarf4_line (dso, ptr, comp_dir, table))

+	return false;

+    }

   dso->lines.debug_lines_len += 4 + table->unit_length + table->size_diff;

   return table->replace_dirs || table->replace_files;

@@ -1807,20 +2094,22 @@ find_new_list_offs (struct debug_lines *lines, size_t idx)

   return table->new_idx;

 }

-/* Read DW_FORM_strp collecting compilation directory.  */

+/* Read DW_FORM_strp or DW_FORM_line_strp collecting compilation directory.  */

 static void

-edit_attributes_str_comp_dir (DSO *dso, unsigned char **ptrp, int phase,

-			      char **comp_dirp, bool *handled_strpp)

+edit_attributes_str_comp_dir (bool line_strp, DSO *dso, unsigned char **ptrp,

+			      int phase, char **comp_dirp, bool *handled_strpp)

 {

   const char *dir;

   size_t idx = do_read_32_relocated (*ptrp);

   /* In phase zero we collect the comp_dir.  */

   if (phase == 0)

     {

-      if (idx >= debug_sections[DEBUG_STR].size)

-	error (1, 0, "%s: Bad string pointer index %zd for comp_dir",

-	       dso->filename, idx);

-      dir = (char *) debug_sections[DEBUG_STR].data + idx;

+      debug_section *sec = &debug_sections[line_strp

+					   ? DEBUG_LINE_STR : DEBUG_STR];

+      if (sec->data == NULL || idx >= sec->size)

+	error (1, 0, "%s: Bad string pointer index %zd for comp_dir (%s)",

+	       dso->filename, idx, sec->name);

+      dir = (char *) sec->data + idx;

       free (*comp_dirp);

       *comp_dirp = strdup (dir);

@@ -1828,8 +2117,13 @@ edit_attributes_str_comp_dir (DSO *dso, unsigned char **ptrp, int phase,

   if (dest_dir != NULL && phase == 0)

     {

-      if (record_file_string_entry_idx (&dso->strings, idx))

-	need_strp_update = true;

+      if (record_file_string_entry_idx (line_strp, dso, idx))

+	{

+	  if (line_strp)

+	    need_line_strp_update = true;

+	  else

+	    need_strp_update = true;

+	}

       *handled_strpp = true;

     }

 }

@@ -1937,17 +2231,24 @@ edit_attributes (DSO *dso, unsigned char *ptr, struct abbrev_tag *t, int phase)

 			}

 		    }

 		}

-	      else if (form == DW_FORM_strp &&

-		       debug_sections[DEBUG_STR].data)

-		edit_attributes_str_comp_dir (dso, &ptr, phase, &comp_dir,

+	      else if (form == DW_FORM_strp)

+		edit_attributes_str_comp_dir (false /* line_strp */, dso,

+					      &ptr, phase, &comp_dir,

 					      &handled_strp);

+	      else if (form == DW_FORM_line_strp)

+		edit_attributes_str_comp_dir (true /* line_strp */, dso, &ptr,

+					      phase, &comp_dir, &handled_strp);

 	    }

 	  else if ((t->tag == DW_TAG_compile_unit

 		    || t->tag == DW_TAG_partial_unit)

-		   && t->attr[i].attr == DW_AT_name

-		   && form == DW_FORM_strp

-		   && debug_sections[DEBUG_STR].data)

+		   && ((form == DW_FORM_strp

+			&& debug_sections[DEBUG_STR].data)

+		       || (form == DW_FORM_line_strp

+			   && debug_sections[DEBUG_LINE_STR].data))

+		   && t->attr[i].attr == DW_AT_name)

 	    {

+	      bool line_strp = form == DW_FORM_line_strp;

+

 	      /* DW_AT_name is the primary file for this compile

 		 unit. If starting with / it is a full path name.

 		 Note that we don't handle DW_FORM_string in this

@@ -1957,11 +2258,14 @@ edit_attributes (DSO *dso, unsigned char *ptr, struct abbrev_tag *t, int phase)

 	      /* In phase zero we will look for a comp_dir to use.  */

 	      if (phase == 0)

 		{

-		  if (idx >= debug_sections[DEBUG_STR].size)

+		  debug_section *sec = &debug_sections[line_strp

+						       ? DEBUG_LINE_STR

+						       : DEBUG_STR];

+		  if (idx >= sec->size)

 		    error (1, 0,

-			   "%s: Bad string pointer index %zd for unit name",

-			   dso->filename, idx);

-		  char *name = (char *) debug_sections[DEBUG_STR].data + idx;

+			   "%s: Bad string pointer index %zd for unit name (%s)",

+			   dso->filename, idx, sec->name);

+		  char *name = (char *) sec->data + idx;

 		  if (*name == '/' && comp_dir == NULL)

 		    {

 		      char *enddir = strrchr (name, '/');

@@ -1982,8 +2286,13 @@ edit_attributes (DSO *dso, unsigned char *ptr, struct abbrev_tag *t, int phase)

 		 pass (1) stores it (the new index). */

 	      if (dest_dir && phase == 0)

 		{

-		  if (record_file_string_entry_idx (&dso->strings, idx))

-		    need_strp_update = true;

+		  if (record_file_string_entry_idx (line_strp, dso, idx))

+		    {

+		      if (line_strp)

+			need_line_strp_update = true;

+		      else

+			need_strp_update = true;

+		    }

 		  handled_strp = true;

 		}

 	    }

@@ -1991,7 +2300,10 @@ edit_attributes (DSO *dso, unsigned char *ptr, struct abbrev_tag *t, int phase)

 	  switch (form)

 	    {

 	    case DW_FORM_strp:

-	      edit_strp (dso, ptr, phase, handled_strp);

+	      edit_strp (dso, false /* line_strp */, ptr, phase, handled_strp);

+	      break;

+	    case DW_FORM_line_strp:

+	      edit_strp (dso, true /* line_strp */, ptr, phase, handled_strp);

 	      break;

 	    }

@@ -2196,11 +2508,11 @@ edit_info (DSO *dso, int phase, struct debug_section *sec)

 /* Rebuild .debug_str.  */

 static void

-edit_dwarf2_any_str (DSO *dso)

+edit_dwarf2_any_str (DSO *dso, struct strings *strings, debug_section *secp)

 {

-  Strtab *strtab = dso->strings.str_tab;

-  Elf_Data *strdata = debug_sections[DEBUG_STR].elf_data;

-  int strndx = debug_sections[DEBUG_STR].sec;

+  Strtab *strtab = strings->str_tab;

+  Elf_Data *strdata = secp->elf_data;

+  int strndx = secp->sec;

   Elf_Scn *strscn = dso->scn[strndx];

   /* Out with the old. */

@@ -2212,8 +2524,8 @@ edit_dwarf2_any_str (DSO *dso)

      but the old ebl version will just abort on out of

      memory... */

   strtab_finalize (strtab, strdata);

-  debug_sections[DEBUG_STR].size = strdata->d_size;

-  dso->strings.str_buf = strdata->d_buf;

+  secp->size = strdata->d_size;

+  strings->str_buf = strdata->d_buf;

 }

 static int

@@ -2359,12 +2671,14 @@ edit_dwarf2 (DSO *dso)

   bool info_rel_updated = false;

   bool types_rel_updated = false;

   bool macro_rel_updated = false;

+  bool line_rel_updated = false;

   for (phase = 0; phase < 2; phase++)

     {

       /* If we don't need to update anyhing, skip phase 1. */

       if (phase == 1

 	  && !need_strp_update

+	  && !need_line_strp_update

 	  && !need_string_replacement

 	  && !need_stmt_update)

 	break;

@@ -2582,15 +2896,14 @@ edit_dwarf2 (DSO *dso)

 		      if (phase == 0)

 			{

 			  size_t idx = read_32_relocated (ptr);

-			  record_existing_string_entry_idx (&dso->strings,

-							    idx);

+			  record_existing_string_entry_idx (false, dso, idx);

 			}

 		      else

 			{

 			  struct stridxentry *entry;

 			  size_t idx, new_idx;

 			  idx = do_read_32_relocated (ptr);

-			  entry = string_find_entry (&dso->strings, idx);

+			  entry = string_find_entry (&dso->debug_str, idx);

 			  new_idx = strent_offset (entry->entry);

 			  write_32_relocated (ptr, new_idx);

 			}

@@ -2610,24 +2923,50 @@ edit_dwarf2 (DSO *dso)

 	    }

 	}

-      /* Same for the debug_str section. Make sure everything is

-	 in place for phase 1 updating of debug_info

+

+      /* Now handle all the DWARF5 line tables, they contain strp

+	 and/or line_strp entries that need to be registered/rewritten.  */

+      setup_relbuf(dso, &debug_sections[DEBUG_LINE], &reltype);

+      rel_updated = false;

+

+      /* edit_dwarf2_line will have set this up, unless there are no

+	 moved/resized (DWARF4) lines. In which case we can just use

+	 the original section data. new_idx will have been setup

+	 correctly, even if it is the same as old_idx.  */

+      unsigned char *line_buf = (unsigned char *)dso->lines.line_buf;

+      if (line_buf == NULL)

+	line_buf = debug_sections[DEBUG_LINE].data;

+      for (int ldx = 0; ldx < dso->lines.used; ldx++)

+	{

+	  struct line_table *t = &dso->lines.table[ldx];

+	  if (t->version >= 5)

+	    read_dwarf5_line (dso, line_buf + t->new_idx, t, phase);

+	}

+      if (rel_updated)

+	line_rel_updated = true;

+

+      /* Same for the debug_str and debug_line_str sections.

+	 Make sure everything is in place for phase 1 updating of debug_info

 	 references. */

       if (phase == 0 && need_strp_update)

-	edit_dwarf2_any_str (dso);

-

+	edit_dwarf2_any_str (dso, &dso->debug_str,

+			     &debug_sections[DEBUG_STR]);

+      if (phase == 0 && need_line_strp_update)

+	edit_dwarf2_any_str (dso, &dso->debug_line_str,

+			     &debug_sections[DEBUG_LINE_STR]);

     }

   /* After phase 1 we might have rewritten the debug_info with

      new strp, strings and/or linep offsets.  */

-  if (need_strp_update || need_string_replacement || need_stmt_update) {

+  if (need_strp_update || need_line_strp_update

+      || need_string_replacement || need_stmt_update) {

     dirty_section (DEBUG_INFO);

     if (debug_sections[DEBUG_TYPES].data != NULL)

       dirty_section (DEBUG_TYPES);

   }

   if (need_strp_update || need_stmt_update)

     dirty_section (DEBUG_MACRO);

-  if (need_stmt_update)

+  if (need_stmt_update || need_line_strp_update)

     dirty_section (DEBUG_LINE);

   /* Update any relocations addends we might have touched. */

@@ -2653,6 +2992,9 @@ edit_dwarf2 (DSO *dso)

 	}

     }

+  if (line_rel_updated)

+    update_rela_data (dso, &debug_sections[DEBUG_LINE]);

+

   return 0;

 }

@@ -2745,7 +3087,8 @@ fdopen_dso (int fd, const char *name)

     }

   dso->filename = (const char *) strdup (name);

-  setup_strings (&dso->strings);

+  setup_strings (&dso->debug_str);

+  setup_strings (&dso->debug_line_str);

   setup_lines (&dso->lines);

   return dso;

@@ -2753,7 +3096,8 @@ error_out:

   if (dso)

     {

       free ((char *) dso->filename);

-      destroy_strings (&dso->strings);

+      destroy_strings (&dso->debug_str);

+      destroy_strings (&dso->debug_line_str);

       destroy_lines (&dso->lines);

       free (dso);

     }

@@ -3034,7 +3378,9 @@ main (int argc, char *argv[])

      in elfutils before 0.169 we will have to update and write out all

      section data if any data has changed (when ELF_F_LAYOUT was

      set). https://sourceware.org/bugzilla/show_bug.cgi?id=21199 */

-  bool need_update = need_strp_update || need_stmt_update;

+  bool need_update = (need_strp_update

+		      || need_line_strp_update

+		      || need_stmt_update);

 #if !_ELFUTILS_PREREQ (0, 169)

   /* string replacements or build_id updates don't change section size. */

@@ -3106,10 +3452,12 @@ main (int argc, char *argv[])

 	      GElf_Xword sec_size = shdr->sh_size;

 	      /* We might have changed the size (and content) of the

-		 debug_str or debug_line section. */

+		 debug_str, debug_line_str or debug_line section. */

 	      size_t secnum = elf_ndxscn (scn);

 	      if (secnum == debug_sections[DEBUG_STR].sec)

 		sec_size = debug_sections[DEBUG_STR].size;

+	      if (secnum == debug_sections[DEBUG_LINE_STR].sec)

+		sec_size = debug_sections[DEBUG_LINE_STR].size;

 	      if (secnum == debug_sections[DEBUG_LINE].sec)

 		sec_size = debug_sections[DEBUG_LINE].size;

@@ -3179,7 +3527,8 @@ main (int argc, char *argv[])

   chmod (file, stat_buf.st_mode);

   free ((char *) dso->filename);

-  destroy_strings (&dso->strings);

+  destroy_strings (&dso->debug_str);

+  destroy_strings (&dso->debug_line_str);

   destroy_lines (&dso->lines);

   free (dso);

-- 

2.18.4