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linux: Add /usr/lib/debug symbol path checking

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Debian likes to hive off symbol information to separate -dbg packages,
installing the debug information in a parallel tree rooted at /usr/lib/debug.
libunwind doesn't know how to find these files but it's easy, per the tested,
attached patch, to make it so. I don't see /usr/lib/debug at
http://www.pathname.com/fhs/pub/fhs-2.3.html#USRLIBLIBRARIESFORPROGRAMMINGANDPA
but
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/4/html/Debugging_with_gdb/separate-debug-files.html
says it's not just Debian and hints it might be driven by gdb. I do see mention
of /usr/lib/debug in libunwind already, but only in a DWARF-specific part of
the code.  A minor concern might be checking errno to see if the problem is
ENOENT before trying the alternate path. That might be better than flogging a
mmap problem or being out of file handles or whatever.
This commit is contained in:
Martin Dorey 2016-06-30 12:52:24 -07:00 committed by Dave Watson
parent a51cf49031
commit 1f4929c05d
1 changed files with 7 additions and 1 deletions
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8
src/os-linux.c
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@ -37,6 +37,7 @@ tdep_get_elf_image (struct elf_image *ei, pid_t pid, unw_word_t ip,
struct map_iterator mi;
int found = 0, rc;
unsigned long hi;
char debug_path[PATH_MAX];
if (maps_init (&mi, pid) < 0)
return -1;
@ -57,7 +58,12 @@ tdep_get_elf_image (struct elf_image *ei, pid_t pid, unw_word_t ip,
{
strncpy(path, mi.path, pathlen);
}
rc = elf_map_image (ei, mi.path);
snprintf (debug_path, sizeof (debug_path), "/usr/lib/debug%s", mi.path);
rc = elf_map_image (ei, debug_path);
if (rc != 0)
{
rc = elf_map_image (ei, mi.path);
}
maps_close (&mi);
return rc;
}