PR10000: emit _stp_relocate* calculations correctly for kernel/module global $data

* translate.cxx (dump_unwindsyms): Also emit STT_OBJECT symbols,
  therefore .data etc. sections into stap-symbols.h.

* tapsets.cxx (iterate_over_modules): Omit a dwfl_getmodules()
  RC-checking assertion that blocked meaningful $context var
  error messages.
  (dwflpp::emit_address): Bypass dwfl_module_relocate_address()
  for kernel symbols as it has been unreliable; subtract sess.sym_stext
  manually.

* testsuite/buildok/seventeen.stp: Extend test with module $global.

1 files changed, 4 insertions, 3 deletions

diff --git a/translate.cxx b/translate.cxx
index 0b81d9bb..47fffd1e 100644
--- a/translate.cxx
+++ b/translate.cxx
@@ -4564,7 +4564,7 @@ dump_unwindsyms (Dwfl_Module *m,
               // base address outself. (see also below).
               extra_offset = sym.st_value - base;
               if (c->session.verbose > 2)
-                clog << "Found kernel _stext 0x" << hex << extra_offset << dec << endl;
+                clog << "Found kernel _stext extra offset 0x" << hex << extra_offset << dec << endl;
             }
 
           // We only need the function symbols to identify kernel-mode
@@ -4572,8 +4572,9 @@ dump_unwindsyms (Dwfl_Module *m,
           // These fake absolute addresses occur in some older i386
           // kernels to indicate they are vDSO symbols, not real
           // functions in the kernel.
-          if (GELF_ST_TYPE (sym.st_info) == STT_FUNC &&
-              ! (sym.st_shndx == SHN_UNDEF || sym.st_shndx == SHN_ABS))
+          if ((GELF_ST_TYPE (sym.st_info) == STT_FUNC ||
+               GELF_ST_TYPE (sym.st_info) == STT_OBJECT) // PR10000: also need .data
+               && !(sym.st_shndx == SHN_UNDEF || sym.st_shndx == SHN_ABS))
             {
               Dwarf_Addr sym_addr = sym.st_value;
               const char *secname = NULL;