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| author | Alan Modra <amodra@gmail.com> | 2015-01-27 23:40:05 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2015-01-28 18:30:54 +1030 |
| commit | dbd1e97e32057af2841e5150daa2e2d4cb046a3b (patch) | |
| tree | ad21bab1f655d821724de5eab738bd4016aff80d /ld/emultempl/ppc64elf.em | |
| parent | 3f8107ab38095bb3db840f9f14a0fd339f55e06e (diff) | |
| download | gdb-dbd1e97e32057af2841e5150daa2e2d4cb046a3b.zip gdb-dbd1e97e32057af2841e5150daa2e2d4cb046a3b.tar.gz gdb-dbd1e97e32057af2841e5150daa2e2d4cb046a3b.tar.bz2 | |
PowerPC64 changes for xlc
The changes to reorder sections for better relro protection on powerpc64,
3e2b0f31, 23283c1b, and 5ad18f16, run into a problem with xlc.
xlc -qdatalocal puts global variables into .toc, which means that .toc
must be writable. The simplest way to accomplish this is to edit the
linker script to remove .toc sections from .got on detecting xlc object
files.
bfd/
* elf64-ppc.h (struct ppc64_elf_params): Add "object_in_toc".
* elf64-ppc.c (ppc64_elf_add_symbol_hook): Assume that global symbols
in .toc indicate xlc compiled code that might require a rw .toc.
ld/
* emulparams/elf64ppc.sh (INITIAL_READWRITE_SECTIONS): Define.
* emultempl/ppc64elf.em (params): Init new field.
(ppc_after_open): New function.
(LDEMUL_AFTER_OPEN): Define.
* ldlang.c (lang_final): Whitespace fix.
ld/testsuite/
* ld-powerpc/tocvar.d, * ld-powerpc/tocvar.s: New test.
* ld-powerpc/tocnovar.d, * ld-powerpc/tocnovar.s: New test.
* ld-powerpc/powerpc.exp: Run tocvar and tocnovar.
Diffstat (limited to 'ld/emultempl/ppc64elf.em')
| -rw-r--r-- | ld/emultempl/ppc64elf.em | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/ld/emultempl/ppc64elf.em b/ld/emultempl/ppc64elf.em index a803c5c..5a784fd 100644 --- a/ld/emultempl/ppc64elf.em +++ b/ld/emultempl/ppc64elf.em @@ -39,7 +39,7 @@ static struct ppc64_elf_params params = { NULL, &ppc_layout_sections_again, 1, 0, 0, ${DEFAULT_PLT_STATIC_CHAIN-0}, -1, 0, - 0, -1, -1}; + 0, -1, -1, 0}; /* Fake input file for stubs. */ static lang_input_statement_type *stub_file; @@ -98,6 +98,37 @@ ppc_create_output_section_statements (void) einfo ("%F%P: can not init BFD: %E\n"); } +/* Called after opening files but before mapping sections. */ + +static void +ppc_after_open (void) +{ + if (stub_file != NULL && link_info.relro && params.object_in_toc) + { + /* We have a .toc section that might be written to at run time. + Don't put .toc into the .got output section. */ + lang_output_section_statement_type *got; + + got = lang_output_section_find (".got"); + if (got != NULL) + { + lang_statement_union_type *s; + for (s = got->children.head; s != NULL; s = s->header.next) + if (s->header.type == lang_wild_statement_enum + && s->wild_statement.filename == NULL) + { + struct wildcard_list **i = &s->wild_statement.section_list; + while (*i != NULL) + if (strcmp ((*i)->spec.name, ".toc") == 0) + *i = (*i)->next; + else + i = &(*i)->next; + } + } + } + gld${EMULATION_NAME}_after_open (); +} + /* Move the input section statement at *U which happens to be on LIST to be just before *TO. */ @@ -874,8 +905,9 @@ PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}' # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation # +LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern +LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements +LDEMUL_AFTER_OPEN=ppc_after_open LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation LDEMUL_FINISH=gld${EMULATION_NAME}_finish -LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements -LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern |