[packages/elfutils.git] / elfutils-strip-copy-symtab.patch

2006-09-19  Jakub Jelinek  <jakub@redhat.com>

	* strip.c (handle_elf): Formatting.  If any relocation sections
	stripped into separate debug info reference symtab that is kept,
	emit symtab/strtab also into the separate debug info file.

--- elfutils/src/strip.c
+++ elfutils/src/strip.c
@@ -399,6 +399,7 @@ handle_elf (int fd, Elf *elf, const char
     Elf_Scn *newscn;
     struct Ebl_Strent *se;
     Elf32_Word *newsymidx;
+    void *debug_data;
   } *shdr_info = NULL;
   Elf_Scn *scn;
   size_t cnt;
@@ -826,8 +827,39 @@ handle_elf (int fd, Elf *elf, const char
      The ones that are not removed in the stripped file are SHT_NOBITS.  */
   if (debug_fname != NULL)
     {
+      /* libbfd and apps using it don't cope with separate debuginfo objects
+	 with relocation sections against SHT_NOBITS .symtab/.strtab
+	 - libbfd isn't able to look up the .symtab/.strtab in the stripped
+	 object instead.  As a workaround, emit .symtab/.strtab in both
+	 places.  */
       for (cnt = 1; cnt < shnum; ++cnt)
 	{
+	  if (shdr_info[cnt].idx == 0
+	      && (shdr_info[cnt].shdr.sh_type == SHT_REL
+		  || shdr_info[cnt].shdr.sh_type == SHT_RELA)
+	      && (shdr_info[cnt].shdr.sh_flags & SHF_ALLOC) == 0)
+	    {
+	      Elf32_Word symtabidx = shdr_info[cnt].old_sh_link;
+	      struct shdr_info *si = &shdr_info[symtabidx];
+	      si->debug_data = "";
+	      shdr_info[si->old_sh_link].debug_data = "";
+	      if (si->symtab_idx)
+		shdr_info[si->symtab_idx].debug_data = "";
+
+	      if (si->shdr.sh_type != SHT_SYMTAB
+		  || (si->shdr.sh_flags & SHF_ALLOC)
+		  || shdr_info[si->old_sh_link].shdr.sh_type != SHT_STRTAB
+		  || (shdr_info[si->old_sh_link].shdr.sh_flags & SHF_ALLOC)
+		  || (si->symtab_idx
+		      && (shdr_info[si->symtab_idx].shdr.sh_flags
+			  & SHF_ALLOC)))
+		error (EXIT_FAILURE, 0,
+		       gettext ("invalid symtab/strtab referenced by nonallocated section"));
+	    }
+	}
+
+      for (cnt = 1; cnt < shnum; ++cnt)
+	{
 	  scn = elf_newscn (debugelf);
 	  if (scn == NULL)
 	    error (EXIT_FAILURE, 0,
@@ -835,7 +867,8 @@ handle_elf (int fd, Elf *elf, const char
 		   elf_errmsg (-1));
 
 	  bool discard_section = (shdr_info[cnt].idx > 0
-				  && cnt != ehdr->e_shstrndx);
+				  && cnt != ehdr->e_shstrndx
+				  && shdr_info[cnt].debug_data == NULL);
 
 	  /* Set the section header in the new file.  */
 	  GElf_Shdr debugshdr = shdr_info[cnt].shdr;
@@ -864,6 +897,13 @@ handle_elf (int fd, Elf *elf, const char
 	  *debugdata = *shdr_info[cnt].data;
 	  if (discard_section)
 	    debugdata->d_buf = NULL;
+	  else if (shdr_info[cnt].debug_data != NULL)
+	    {
+	      shdr_info[cnt].debug_data = xmalloc (debugdata->d_size);
+	      memcpy (shdr_info[cnt].debug_data, debugdata->d_buf,
+		      debugdata->d_size);
+	      debugdata->d_buf = shdr_info[cnt].debug_data;
+	    }
 	}
 
       /* Finish the ELF header.  Fill in the fields not handled by
@@ -1055,7 +1095,7 @@ handle_elf (int fd, Elf *elf, const char
 	    shdr_info[shdr_info[cnt].shdr.sh_info].idx;
 
 	/* Get the data from the old file if necessary.  We already
-           created the data for the section header string table.  */
+	   created the data for the section header string table.  */
 	if (cnt < shnum)
 	  {
 	    if (shdr_info[cnt].data == NULL)
@@ -1264,6 +1304,13 @@ handle_elf (int fd, Elf *elf, const char
 	      if (shdr_info[shdr_info[cnt].old_sh_link].newsymidx == NULL)
 		continue;
 
+	      /* If the symbol table is not discarded, but additionally
+		 duplicated in separate debug file and this section
+		 is discarded, don't adjust anything.  */
+	      if (shdr_info[cnt].idx == 0
+		  && shdr_info[shdr_info[cnt].old_sh_link].debug_data != NULL)
+		continue;
+
 	      Elf32_Word *newsymidx
 		= shdr_info[shdr_info[cnt].old_sh_link].newsymidx;
 	      Elf_Data *d = elf_getdata (shdr_info[cnt].idx == 0
@@ -1322,6 +1369,13 @@ handle_elf (int fd, Elf *elf, const char
 	      if (shdr_info[symtabidx].newsymidx == NULL)
 		continue;
 
+	      /* If the symbol table is not discarded, but additionally
+		 duplicated in separate debug file and this section
+		 is discarded, don't adjust anything.  */
+	      if (shdr_info[cnt].idx == 0
+		  && shdr_info[symtabidx].debug_data != NULL)
+		continue;
+
 	      assert (shdr_info[cnt].idx > 0);
 
 	      /* The hash section in the new file.  */
@@ -1447,7 +1501,7 @@ handle_elf (int fd, Elf *elf, const char
 			  chain[hidx] = inner;
 			}
 		    }
-	        }
+		}
 	    }
 	  else if (shdr_info[cnt].shdr.sh_type == SHT_GNU_versym)
 	    {
@@ -1460,6 +1514,13 @@ handle_elf (int fd, Elf *elf, const char
 	      if (shdr_info[symtabidx].newsymidx == NULL)
 		continue;
 
+	      /* If the symbol table is not discarded, but additionally
+		 duplicated in separate debug file and this section
+		 is discarded, don't adjust anything.  */
+	      if (shdr_info[cnt].idx == 0
+		  && shdr_info[symtabidx].debug_data != NULL)
+		continue;
+
 	      assert (shdr_info[cnt].idx > 0);
 
 	      /* The symbol version section in the new file.  */
@@ -1504,20 +1565,27 @@ handle_elf (int fd, Elf *elf, const char
 	  else if (shdr_info[cnt].shdr.sh_type == SHT_GROUP)
 	    {
 	      /* Check whether the associated symbol table changed.  */
-	      if (shdr_info[shdr_info[cnt].old_sh_link].newsymidx != NULL)
-		{
-		  /* Yes the symbol table changed.  Update the section
-		     header of the section group.  */
-		  scn = elf_getscn (newelf, shdr_info[cnt].idx);
-		  GElf_Shdr shdr_mem;
-		  GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
-		  assert (shdr != NULL);
+	      if (shdr_info[shdr_info[cnt].old_sh_link].newsymidx == NULL)
+		continue;
 
-		  size_t stabidx = shdr_info[cnt].old_sh_link;
-		  shdr->sh_info = shdr_info[stabidx].newsymidx[shdr->sh_info];
+	      /* If the symbol table is not discarded, but additionally
+		 duplicated in separate debug file and this section
+		 is discarded, don't adjust anything.  */
+	      if (shdr_info[cnt].idx == 0
+		  && shdr_info[shdr_info[cnt].old_sh_link].debug_data != NULL)
+		continue;
 
-		  (void) gelf_update_shdr (scn, shdr);
-		}
+	      /* Yes the symbol table changed.  Update the section
+		 header of the section group.  */
+	      scn = elf_getscn (newelf, shdr_info[cnt].idx);
+	      GElf_Shdr shdr_mem;
+	      GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
+	      assert (shdr != NULL);
+
+	      size_t stabidx = shdr_info[cnt].old_sh_link;
+	      shdr->sh_info = shdr_info[stabidx].newsymidx[shdr->sh_info];
+
+	      (void) gelf_update_shdr (scn, shdr);
 	    }
 	}
     }
@@ -1647,7 +1715,10 @@ handle_elf (int fd, Elf *elf, const char
 	 table indices.  */
       if (any_symtab_changes)
 	for (cnt = 1; cnt <= shdridx; ++cnt)
-	  free (shdr_info[cnt].newsymidx);
+	  {
+	    free (shdr_info[cnt].newsymidx);
+	    free (shdr_info[cnt].debug_data);
+	  }
 
       /* Free the memory.  */
       if ((shnum + 2) * sizeof (struct shdr_info) > MAX_STACK_ALLOC)
Commit	Line	Data
5cf1fa4c JB	1	2006-09-19 Jakub Jelinek <jakub@redhat.com>
	2
	3	* strip.c (handle_elf): Formatting. If any relocation sections
	4	stripped into separate debug info reference symtab that is kept,
	5	emit symtab/strtab also into the separate debug info file.
	6
	7	--- elfutils/src/strip.c
	8	+++ elfutils/src/strip.c
	9	@@ -399,6 +399,7 @@ handle_elf (int fd, Elf *elf, const char
	10	Elf_Scn *newscn;
	11	struct Ebl_Strent *se;
	12	Elf32_Word *newsymidx;
	13	+ void *debug_data;
	14	} *shdr_info = NULL;
	15	Elf_Scn *scn;
	16	size_t cnt;
	17	@@ -826,8 +827,39 @@ handle_elf (int fd, Elf *elf, const char
	18	The ones that are not removed in the stripped file are SHT_NOBITS. */
	19	if (debug_fname != NULL)
	20	{
	21	+ /* libbfd and apps using it don't cope with separate debuginfo objects
	22	+ with relocation sections against SHT_NOBITS .symtab/.strtab
	23	+ - libbfd isn't able to look up the .symtab/.strtab in the stripped
	24	+ object instead. As a workaround, emit .symtab/.strtab in both
	25	+ places. */
	26	for (cnt = 1; cnt < shnum; ++cnt)
	27	{
	28	+ if (shdr_info[cnt].idx == 0
	29	+ && (shdr_info[cnt].shdr.sh_type == SHT_REL
	30	+ \|\| shdr_info[cnt].shdr.sh_type == SHT_RELA)
	31	+ && (shdr_info[cnt].shdr.sh_flags & SHF_ALLOC) == 0)
	32	+ {
	33	+ Elf32_Word symtabidx = shdr_info[cnt].old_sh_link;
	34	+ struct shdr_info *si = &shdr_info[symtabidx];
	35	+ si->debug_data = "";
	36	+ shdr_info[si->old_sh_link].debug_data = "";
	37	+ if (si->symtab_idx)
	38	+ shdr_info[si->symtab_idx].debug_data = "";
	39	+
	40	+ if (si->shdr.sh_type != SHT_SYMTAB
	41	+ \|\| (si->shdr.sh_flags & SHF_ALLOC)
	42	+ \|\| shdr_info[si->old_sh_link].shdr.sh_type != SHT_STRTAB
	43	+ \|\| (shdr_info[si->old_sh_link].shdr.sh_flags & SHF_ALLOC)
	44	+ \|\| (si->symtab_idx
	45	+ && (shdr_info[si->symtab_idx].shdr.sh_flags
	46	+ & SHF_ALLOC)))
	47	+ error (EXIT_FAILURE, 0,
	48	+ gettext ("invalid symtab/strtab referenced by nonallocated section"));
	49	+ }
	50	+ }
	51	+
	52	+ for (cnt = 1; cnt < shnum; ++cnt)
	53	+ {
	54	scn = elf_newscn (debugelf);
	55	if (scn == NULL)
	56	error (EXIT_FAILURE, 0,
	57	@@ -835,7 +867,8 @@ handle_elf (int fd, Elf *elf, const char
	58	elf_errmsg (-1));
	59
	60	bool discard_section = (shdr_info[cnt].idx > 0
	61	- && cnt != ehdr->e_shstrndx);
	62	+ && cnt != ehdr->e_shstrndx
	63	+ && shdr_info[cnt].debug_data == NULL);
	64
65	/* Set the section header in the new file. */
66	GElf_Shdr debugshdr = shdr_info[cnt].shdr;
67	@@ -864,6 +897,13 @@ handle_elf (int fd, Elf *elf, const char
68	debugdata = shdr_info[cnt].data;
69	if (discard_section)
70	debugdata->d_buf = NULL;
71	+ else if (shdr_info[cnt].debug_data != NULL)
72	+ {
73	+ shdr_info[cnt].debug_data = xmalloc (debugdata->d_size);
74	+ memcpy (shdr_info[cnt].debug_data, debugdata->d_buf,
75	+ debugdata->d_size);
76	+ debugdata->d_buf = shdr_info[cnt].debug_data;
77	+ }
78	}
79
80	/* Finish the ELF header. Fill in the fields not handled by
81	@@ -1055,7 +1095,7 @@ handle_elf (int fd, Elf *elf, const char
82	shdr_info[shdr_info[cnt].shdr.sh_info].idx;
83
84	/* Get the data from the old file if necessary. We already
85	- created the data for the section header string table. */
86	+ created the data for the section header string table. */
87	if (cnt < shnum)
88	{
89	if (shdr_info[cnt].data == NULL)
90	@@ -1264,6 +1304,13 @@ handle_elf (int fd, Elf *elf, const char
91	if (shdr_info[shdr_info[cnt].old_sh_link].newsymidx == NULL)
92	continue;
93
94	+ /* If the symbol table is not discarded, but additionally
95	+ duplicated in separate debug file and this section
96	+ is discarded, don't adjust anything. */
97	+ if (shdr_info[cnt].idx == 0
98	+ && shdr_info[shdr_info[cnt].old_sh_link].debug_data != NULL)
99	+ continue;
100	+
101	Elf32_Word *newsymidx
102	= shdr_info[shdr_info[cnt].old_sh_link].newsymidx;
103	Elf_Data *d = elf_getdata (shdr_info[cnt].idx == 0
104	@@ -1322,6 +1369,13 @@ handle_elf (int fd, Elf *elf, const char
105	if (shdr_info[symtabidx].newsymidx == NULL)
106	continue;
107
108	+ /* If the symbol table is not discarded, but additionally
109	+ duplicated in separate debug file and this section
110	+ is discarded, don't adjust anything. */
111	+ if (shdr_info[cnt].idx == 0
112	+ && shdr_info[symtabidx].debug_data != NULL)
113	+ continue;
114	+
115	assert (shdr_info[cnt].idx > 0);
116
117	/* The hash section in the new file. */
118	@@ -1447,7 +1501,7 @@ handle_elf (int fd, Elf *elf, const char
119	chain[hidx] = inner;
120	}
121	}
122	- }
123	+ }
124	}
125	else if (shdr_info[cnt].shdr.sh_type == SHT_GNU_versym)
126	{
127	@@ -1460,6 +1514,13 @@ handle_elf (int fd, Elf *elf, const char
128	if (shdr_info[symtabidx].newsymidx == NULL)
129	continue;
130
131	+ /* If the symbol table is not discarded, but additionally
132	+ duplicated in separate debug file and this section
133	+ is discarded, don't adjust anything. */
134	+ if (shdr_info[cnt].idx == 0
135	+ && shdr_info[symtabidx].debug_data != NULL)
136	+ continue;
137	+
138	assert (shdr_info[cnt].idx > 0);
139
140	/* The symbol version section in the new file. */
141	@@ -1504,20 +1565,27 @@ handle_elf (int fd, Elf *elf, const char
142	else if (shdr_info[cnt].shdr.sh_type == SHT_GROUP)
143	{
144	/* Check whether the associated symbol table changed. */
145	- if (shdr_info[shdr_info[cnt].old_sh_link].newsymidx != NULL)
146	- {
147	- /* Yes the symbol table changed. Update the section
148	- header of the section group. */
149	- scn = elf_getscn (newelf, shdr_info[cnt].idx);
150	- GElf_Shdr shdr_mem;
151	- GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
152	- assert (shdr != NULL);
153	+ if (shdr_info[shdr_info[cnt].old_sh_link].newsymidx == NULL)
154	+ continue;
155
156	- size_t stabidx = shdr_info[cnt].old_sh_link;
157	- shdr->sh_info = shdr_info[stabidx].newsymidx[shdr->sh_info];
158	+ /* If the symbol table is not discarded, but additionally
159	+ duplicated in separate debug file and this section
160	+ is discarded, don't adjust anything. */
161	+ if (shdr_info[cnt].idx == 0
162	+ && shdr_info[shdr_info[cnt].old_sh_link].debug_data != NULL)
163	+ continue;
164
165	- (void) gelf_update_shdr (scn, shdr);
166	- }
167	+ /* Yes the symbol table changed. Update the section
168	+ header of the section group. */
169	+ scn = elf_getscn (newelf, shdr_info[cnt].idx);
170	+ GElf_Shdr shdr_mem;
171	+ GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
172	+ assert (shdr != NULL);
173	+
174	+ size_t stabidx = shdr_info[cnt].old_sh_link;
175	+ shdr->sh_info = shdr_info[stabidx].newsymidx[shdr->sh_info];
176	+
177	+ (void) gelf_update_shdr (scn, shdr);
178	}
179	}
180	}
181	@@ -1647,7 +1715,10 @@ handle_elf (int fd, Elf *elf, const char
182	table indices. */
183	if (any_symtab_changes)
184	for (cnt = 1; cnt <= shdridx; ++cnt)
185	- free (shdr_info[cnt].newsymidx);
186	+ {
187	+ free (shdr_info[cnt].newsymidx);
188	+ free (shdr_info[cnt].debug_data);
189	+ }
190
191	/* Free the memory. */
192	if ((shnum + 2) * sizeof (struct shdr_info) > MAX_STACK_ALLOC)
193