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| author | Alan Modra <amodra@gmail.com> | 2020-07-07 09:58:10 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2020-07-07 18:26:33 +0930 |
| commit | 23f5e55ed170c58c66437cc234887cecd5a11866 (patch) | |
| tree | 18b44f85ca2f28968ede60e9db3f426d70daf8e8 /bfd/xcofflink.c | |
| parent | c800188601ee6f537d268fcadfbac7be0389ced7 (diff) | |
| download | gdb-23f5e55ed170c58c66437cc234887cecd5a11866.zip gdb-23f5e55ed170c58c66437cc234887cecd5a11866.tar.gz gdb-23f5e55ed170c58c66437cc234887cecd5a11866.tar.bz2 | |
XCOFF ld segfaults when running ld testsuite
The binutils XCOFF support doesn't handle random linker scripts very
well at all. These tweaks to final_link fix segfaults when some
linker created sections are discarded due to "/DISCARD/ : { *(.*) }"
in scripts. The xcoff_mark change is necessary to not segfault on
symbols defined in scripts, which may be bfd_link_hash_defined yet
have u.def.section set to bfd_und_section_ptr. (Which might seem odd,
but occurs during early stages of linking before input sections are
mapped.)
* xcofflink.c (xcoff_mark): Don't mark const sections.
(bfd_xcoff_record_link_assignment): Add FIXME.
(_bfd_xcoff_bfd_final_link): Don't segfault on assorted magic
sections being discarded by linker script.
Diffstat (limited to 'bfd/xcofflink.c')
| -rw-r--r-- | bfd/xcofflink.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/bfd/xcofflink.c b/bfd/xcofflink.c index 4497be2..985e221 100644 --- a/bfd/xcofflink.c +++ b/bfd/xcofflink.c @@ -2898,7 +2898,7 @@ xcoff_mark_symbol_by_name (struct bfd_link_info *info, static bfd_boolean xcoff_mark (struct bfd_link_info *info, asection *sec) { - if (bfd_is_abs_section (sec) + if (bfd_is_const_section (sec) || (sec->flags & SEC_MARK) != 0) return TRUE; @@ -3210,7 +3210,13 @@ bfd_xcoff_link_count_reloc (bfd *output_bfd, } /* This function is called for each symbol to which the linker script - assigns a value. */ + assigns a value. + FIXME: In cases like the linker test ld-scripts/defined5 where a + symbol is defined both by an input object file and the script, + the script definition doesn't override the object file definition + as is usual for other targets. At least not when the symbol is + output. Other uses of the symbol value by the linker do use the + script value. */ bfd_boolean bfd_xcoff_record_link_assignment (bfd *output_bfd, @@ -6327,7 +6333,9 @@ _bfd_xcoff_bfd_final_link (bfd *abfd, struct bfd_link_info *info) /* Write out the loader section contents. */ o = xcoff_hash_table (info)->loader_section; - if (o) + if (o != NULL + && o->size != 0 + && o->output_section != bfd_abs_section_ptr) { BFD_ASSERT ((bfd_byte *) flinfo.ldrel == (xcoff_hash_table (info)->loader_section->contents @@ -6339,19 +6347,25 @@ _bfd_xcoff_bfd_final_link (bfd *abfd, struct bfd_link_info *info) /* Write out the magic sections. */ o = xcoff_hash_table (info)->linkage_section; - if (o->size > 0 + if (o != NULL + && o->size != 0 + && o->output_section != bfd_abs_section_ptr && ! bfd_set_section_contents (abfd, o->output_section, o->contents, (file_ptr) o->output_offset, o->size)) goto error_return; o = xcoff_hash_table (info)->toc_section; - if (o->size > 0 + if (o != NULL + && o->size != 0 + && o->output_section != bfd_abs_section_ptr && ! bfd_set_section_contents (abfd, o->output_section, o->contents, (file_ptr) o->output_offset, o->size)) goto error_return; o = xcoff_hash_table (info)->descriptor_section; - if (o->size > 0 + if (o != NULL + && o->size != 0 + && o->output_section != bfd_abs_section_ptr && ! bfd_set_section_contents (abfd, o->output_section, o->contents, (file_ptr) o->output_offset, o->size)) @@ -6374,7 +6388,9 @@ _bfd_xcoff_bfd_final_link (bfd *abfd, struct bfd_link_info *info) /* Write out the debugging string table. */ o = xcoff_hash_table (info)->debug_section; - if (o != NULL) + if (o != NULL + && o->size != 0 + && o->output_section != bfd_abs_section_ptr) { struct bfd_strtab_hash *debug_strtab; |