Hi!
info->dlpi_addr == 0 is true for executables (but those have also
info->dlpi_name set to ""), but not just for those, it is true also
for successfully prelinked shared libraries or any other libraries that
have been linked at non-zero offset and the dynamic linker managed to mmap
them where they were prelinked resp. linked to.
BTW, I'm surprised you aren't adding base_address (well, in fact it is
actually not base address, but load bias, difference between load address
and link base address) to elf_initialize_syminfo created symbol addresses,
because all of them should be biased by the load address.
And, elf_initialize_syminfo should ignore st_shndx == SHN_UNDEF symbols,
those shouldn't be biased but not even entered into the table.
2013-11-18 Jakub Jelinek <ja...@redhat.com>
* elf.c (phdr_callback): Process info->dlpi_addr == 0 normally.
--- libbacktrace/elf.c.jj 2013-11-18 09:59:08.000000000 +0100
+++ libbacktrace/elf.c 2013-11-18 12:48:07.780700382 +0100
@@ -863,12 +863,8 @@ phdr_callback (struct dl_phdr_info *info
fileline elf_fileline_fn;
int found_dwarf;
- /* There is not much we can do if we don't have the module name. If
- the base address is 0, this is probably the executable, which we
- already loaded. */
- if (info->dlpi_name == NULL
- || info->dlpi_name[0] == '\0'
- || info->dlpi_addr == 0)
+ /* There is not much we can do if we don't have the module name. */
+ if (info->dlpi_name == NULL || info->dlpi_name[0] == '\0')
return 0;
descriptor = backtrace_open (info->dlpi_name, pd->error_callback, pd->data,
Jakub
