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authorWill Schmidt <will_schmidt@vnet.ibm.com>2021-08-05 12:46:32 -0500
committerWill Schmidt <will_schmidt@vnet.ibm.com>2021-08-05 12:46:32 -0500
commitbad23de35435e5663740c6710671c418246c8137 (patch)
tree759b93f8e170cc60aa38fb80ce1cda9a3daa55cb /gdb
parent4b0cf3d6d0ff4a737f8aee2ed388fbc72ba941be (diff)
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[gdb] Handle .TOC. sections during gdb-compile for rs6000 target.
[gdb] Handle .TOC. sections during gdb-compile for rs6000 target. When we encounter a .TOC. symbol in the object we are loading, we need to associate this with the .toc section in order to properly resolve other symbols in the object. IF a .toc section is not found, iterate the sections until we find one with the SEC_ALLOC flag. If that also fails, fall back to using the *ABS* section, pointed to by bfd_abs_section_ptr.
Diffstat (limited to 'gdb')
-rw-r--r--gdb/compile/compile-object-load.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/gdb/compile/compile-object-load.c b/gdb/compile/compile-object-load.c
index 1c51280..a25eb61 100644
--- a/gdb/compile/compile-object-load.c
+++ b/gdb/compile/compile-object-load.c
@@ -722,6 +722,47 @@ compile_object_load (const compile_file_names &file_names,
sym->value = 0;
continue;
}
+ if (strcmp (sym->name, ".TOC.") == 0)
+ {
+ /* Handle the .TOC. symbol as the linker would do. Set the .TOC.
+ sections value to 0x8000 (see bfd/elf64-ppc.c TOC_BASE_OFF);
+ point the symbol section at the ".toc" section;
+ and pass the toc->vma value into bfd_set_gp_value().
+ If the .toc section is not found, use the first section
+ with the SEC_ALLOC flag set. In the unlikely case that
+ we still do not have a section identified, fall back to using
+ the "*ABS*" section. */
+ asection *toc_fallback = bfd_get_section_by_name(abfd.get(), ".toc");
+ if (toc_fallback == NULL)
+ {
+ for (asection *tsect = abfd->sections; tsect != nullptr;
+ tsect = tsect->next)
+ {
+ if (bfd_section_flags (tsect) & SEC_ALLOC)
+ {
+ toc_fallback = tsect;
+ break;
+ }
+ }
+ }
+
+ if (toc_fallback == NULL)
+ /* If we've gotten here, we have not found a section usable
+ as a backup for the .toc section. In this case, use the
+ absolute (*ABS*) section. */
+ toc_fallback = bfd_abs_section_ptr;
+
+ sym->section = toc_fallback;
+ sym->value = 0x8000;
+ bfd_set_gp_value(abfd.get(), toc_fallback->vma);
+ if (compile_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "Connectiong ELF symbol \"%s\" to the .toc section (%s)\n",
+ sym->name,
+ paddress (target_gdbarch (), sym->value));
+ continue;
+ }
+
bmsym = lookup_minimal_symbol (sym->name, NULL, NULL);
switch (bmsym.minsym == NULL
? mst_unknown : MSYMBOL_TYPE (bmsym.minsym))