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elfutils/elfutils-strip-copy-symtab....

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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;
@@ -826,6 +827,37 @@ 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);
@@ -835,6 +867,7 @@ handle_elf (int fd, Elf *elf, const char
elf_errmsg (-1));
bool discard_section = (shdr_info[cnt].idx > 0
+ && shdr_info[cnt].debug_data == NULL
&& shdr_info[cnt].shdr.sh_type != SHT_NOTE
&& cnt != ehdr->e_shstrndx);
@@ -865,6 +898,13 @@ 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
@@ -1056,7 +1096,7 @@ 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)
@@ -1283,6 +1323,13 @@ 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
@@ -1341,6 +1388,13 @@ 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. */
@@ -1460,7 +1514,7 @@ handle_elf (int fd, Elf *elf, const char
chain[hidx] = inner;
}
}
- }
+ }
}
else if (shdr_info[cnt].shdr.sh_type == SHT_GNU_versym)
{
@@ -1473,6 +1527,13 @@ 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. */
@@ -1515,20 +1576,27 @@ 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);
}
}
}
@@ -1658,7 +1726,10 @@ 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)
--- elfutils/tests/run-strip-test5.sh.~1~
+++ elfutils/tests/run-strip-test5.sh
@@ -1,5 +1,5 @@
original=testfile8
-stripped=testfile16
-debugfile=testfile16.debug
+stripped=testfile16.symtab
+debugfile=testfile16.symtab.debug
. $srcdir/run-strip-test.sh
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