File dwz-0.12-ignore-nobits.patch of Package dwz

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File dwz-0.12-ignore-nobits.patch of Package dwz (Revision ff2b3f5eb088472b230abfbb5646ddd7)

Currently displaying revision ff2b3f5eb088472b230abfbb5646ddd7 , Show latest

diff --git a/dwz.c b/dwz.c
index b3b779d..5ab45a2 100644
--- a/dwz.c
+++ b/dwz.c
@@ -10016,6 +10016,26 @@ error_out:
   return NULL;
 }
 
+/* Sort shdr indices after sh_offset.  */
+static DSO *shdr_sort_compar_dso;
+static int
+shdr_sort_compar (const void *p1, const void *p2)
+{
+  const int *idx1 = (const int *)p1;
+  const int *idx2 = (const int *)p2;
+  if (shdr_sort_compar_dso->shdr[*idx1].sh_offset
+      < shdr_sort_compar_dso->shdr[*idx2].sh_offset)
+    return -1;
+  else if (shdr_sort_compar_dso->shdr[*idx1].sh_offset
+	   > shdr_sort_compar_dso->shdr[*idx2].sh_offset)
+    return 1;
+  if (*idx1 < *idx2)
+    return -1;
+  else if (*idx1 > *idx2)
+    return 1;
+  return 0;
+}
+
 /* Store new ELF into FILE.  debug_sections array contains
    new_data/new_size pairs where needed.  */
 static int
@@ -10090,7 +10110,14 @@ write_dso (DSO *dso, const char *file, struct stat *st)
 	if (off < min_shoff)
 	  min_shoff = off;
 	for (j = 1; j < dso->ehdr.e_shnum; ++j)
-	  if (dso->shdr[j].sh_offset > off)
+	  if (dso->shdr[j].sh_offset > off
+	      /* Do not adjust SHT_NOBITS sh_offset here, the kernel
+	         for example lays out those in the middle of some
+		 other sections which may cause their offset to wrap
+		 around zero.
+		 ???  Now in theory not adjusting means we might end up
+		 with those having a higher offset than any other section.  */
+	      && dso->shdr[j].sh_type != SHT_NOBITS)
 	    dso->shdr[j].sh_offset += diff;
 	if (ehdr.e_shoff > off)
 	  ehdr.e_shoff += diff;
@@ -10123,6 +10150,7 @@ write_dso (DSO *dso, const char *file, struct stat *st)
 
   if (min_shoff != ~(GElf_Off) 0)
     {
+      /* Any section needs sh_offset adjustment to meet sh_addralign?  */
       for (j = 1; j < dso->ehdr.e_shnum; ++j)
 	if (dso->shdr[j].sh_offset >= min_shoff
 	    && dso->shdr[j].sh_addralign > 1
@@ -10133,21 +10161,34 @@ write_dso (DSO *dso, const char *file, struct stat *st)
 	      && (ehdr.e_shoff & (ehdr.e_ident[EI_CLASS] == ELFCLASS64
 				  ? 7 : 3)) != 0))
 	{
+	  /* Compute a section index list sorted after sh_offset.  */
+	  int *shdrmap = alloca (dso->ehdr.e_shnum * sizeof (int));
+	  for (j = 0; j < dso->ehdr.e_shnum; ++j)
+	    shdrmap[j] = j;
+	  shdr_sort_compar_dso = dso;
+	  qsort (shdrmap, dso->ehdr.e_shnum, sizeof (int),
+		 shdr_sort_compar);
+	  shdr_sort_compar_dso = NULL;
+
 	  /* Need to fix up sh_offset/e_shoff.  Punt if all the sections
 	     >= min_shoff aren't non-ALLOC.  */
 	  GElf_Off last_shoff = 0;
 	  int k = -1;
 	  bool shdr_placed = false;
 	  for (j = 1; j < dso->ehdr.e_shnum; ++j)
-	    if (dso->shdr[j].sh_offset < min_shoff && !last_shoff)
+	    if (dso->shdr[shdrmap[j]].sh_offset < min_shoff && !last_shoff)
+	      continue;
+	    else if (dso->shdr[shdrmap[j]].sh_type == SHT_NOBITS)
+	      /* NOBITS are just left in place where they are and their
+		 sh_size does not matter.  */
 	      continue;
-	    else if ((dso->shdr[j].sh_flags & SHF_ALLOC) != 0)
+	    else if ((dso->shdr[shdrmap[j]].sh_flags & SHF_ALLOC) != 0)
 	      {
 		error (0, 0, "Allocatable section in %s after non-allocatable "
 			     "ones", dso->filename);
 		return 1;
 	      }
-	    else if (dso->shdr[j].sh_offset < last_shoff)
+	    else if (dso->shdr[shdrmap[j]].sh_offset < last_shoff)
 	      {
 		error (0, 0, "Section offsets in %s not monotonically "
 			     "increasing", dso->filename);
@@ -10157,7 +10198,8 @@ write_dso (DSO *dso, const char *file, struct stat *st)
 	      {
 		if (k == -1)
 		  k = j;
-		last_shoff = dso->shdr[j].sh_offset + dso->shdr[j].sh_size;
+		last_shoff = (dso->shdr[shdrmap[j]].sh_offset
+			      + dso->shdr[shdrmap[j]].sh_size);
 	      }
 	  last_shoff = min_shoff;
 	  for (j = k; j <= dso->ehdr.e_shnum; ++j)
@@ -10165,7 +10207,7 @@ write_dso (DSO *dso, const char *file, struct stat *st)
 	      if (!shdr_placed
 		  && ehdr.e_shoff >= min_shoff
 		  && (j == dso->ehdr.e_shnum
-		      || ehdr.e_shoff < dso->shdr[j].sh_offset))
+		      || ehdr.e_shoff < dso->shdr[shdrmap[j]].sh_offset))
 		{
 		  if (ehdr.e_ident[EI_CLASS] == ELFCLASS64)
 		    ehdr.e_shoff = (last_shoff + 7) & -8;
@@ -10176,13 +10218,18 @@ write_dso (DSO *dso, const char *file, struct stat *st)
 		}
 	      if (j == dso->ehdr.e_shnum)
 		break;
-	      dso->shdr[j].sh_offset = last_shoff;
-	      if (dso->shdr[j].sh_addralign > 1)
-		dso->shdr[j].sh_offset
-		  = (last_shoff + dso->shdr[j].sh_addralign - 1)
-		    & ~(dso->shdr[j].sh_addralign - (GElf_Off) 1);
-	      last_shoff = dso->shdr[j].sh_offset + dso->shdr[j].sh_size;
-	      if (addsec != -1 && j == addsec)
+	      /* Do not touch SHT_NOBITS section offsets and more importantly
+	         do not account for their size.  */
+	      if (dso->shdr[shdrmap[j]].sh_type == SHT_NOBITS)
+		continue;
+	      dso->shdr[shdrmap[j]].sh_offset = last_shoff;
+	      if (dso->shdr[shdrmap[j]].sh_addralign > 1)
+		dso->shdr[shdrmap[j]].sh_offset
+		  = (last_shoff + dso->shdr[shdrmap[j]].sh_addralign - 1)
+		    & ~(dso->shdr[shdrmap[j]].sh_addralign - (GElf_Off) 1);
+	      last_shoff = (dso->shdr[shdrmap[j]].sh_offset
+			    + dso->shdr[shdrmap[j]].sh_size);
+	      if (addsec != -1 && shdrmap[j] == addsec)
 		last_shoff += addsize;
 	    }
 	}

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File dwz-0.12-ignore-nobits.patch of Package dwz (Revision ff2b3f5eb088472b230abfbb5646ddd7)

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