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Control powerpc64-ld provision of register save/restore

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This patch allows the user to override powerpc64-ld's default for
providing linker generated register save and restore functions as used
by gcc -Os code.  Normally these are not provided by ld -r, so Linux
kernel modules have needed to include their own copies.

bfd/
	* elf64-ppc.h (struct ppc64_elf_params): Add save_restore_funcs.
	* elf64-ppc.c (ppc64_elf_func_desc_adjust): Use it to control
	provision of out-of-line register save/restore routines.
ld/
	* emultempl/ppc64elf.em (params): Init new field.
	(ppc_create_output_section_statements): Set params.save_restore_funcs
	default.
	(PARSE_AND_LIST_*): Add support for --save-restore-funcs and
	--no-save-restore-funcs.
This commit is contained in:
Alan Modra 2014-02-19 14:23:12 +10:30
parent e095146be2
commit 7d4c687d56
5 changed files with 42 additions and 3 deletions
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6
bfd/ChangeLog
View File

@ -1,3 +1,9 @@
2014-02-19 Alan Modra <amodra@gmail.com>
* elf64-ppc.h (struct ppc64_elf_params): Add save_restore_funcs.
* elf64-ppc.c (ppc64_elf_func_desc_adjust): Use it to control
provision of out-of-line register save/restore routines.
2014-02-18 Jack Carter <jack.carter@imgtec.com>
* elfxx-mips.c(_bfd_mips_elf_modify_segment_map): Deleted hard coding of

2
bfd/elf64-ppc.c
View File

@ -6852,7 +6852,7 @@ ppc64_elf_func_desc_adjust (bfd *obfd ATTRIBUTE_UNUSED,
/* Provide any missing _save* and _rest* functions. */
htab->sfpr->size = 0;
if (!info->relocatable)
if (htab->params->save_restore_funcs)
for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++)
if (!sfpr_define (info, &funcs[i]))
return FALSE;

3
bfd/elf64-ppc.h
View File

@ -55,6 +55,9 @@ struct ppc64_elf_params
/* Whether to emit symbols for stubs. */
int emit_stub_syms;
/* Whether to generate out-of-line register save/restore for gcc -Os code. */
int save_restore_funcs;
};
bfd_boolean ppc64_elf_init_stub_bfd

8
ld/ChangeLog
View File

@ -1,3 +1,11 @@
2014-02-19 Alan Modra <amodra@gmail.com>
* emultempl/ppc64elf.em (params): Init new field.
(ppc_create_output_section_statements): Set params.save_restore_funcs
default.
(PARSE_AND_LIST_*): Add support for --save-restore-funcs and
--no-save-restore-funcs.
2014-02-17 Alan Modra <amodra@gmail.com>
* emultemps/ppc64elf.em (params): New static struct replacing

26
ld/emultempl/ppc64elf.em
View File

@ -39,7 +39,7 @@ static struct ppc64_elf_params params = { NULL,
&ppc_layout_sections_again,
1, 0, 0,
${DEFAULT_PLT_STATIC_CHAIN-0}, -1, 0,
0, -1};
0, -1, -1};
/* Fake input file for stubs. */
static lang_input_statement_type *stub_file;
@ -96,6 +96,8 @@ ppc_create_output_section_statements (void)
stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
ldlang_add_file (stub_file);
params.stub_bfd = stub_file->the_bfd;
if (params.save_restore_funcs < 0)
params.save_restore_funcs = !link_info.relocatable;
if (!ppc64_elf_init_stub_bfd (&link_info, &params))
einfo ("%F%P: can not init BFD: %E\n");
}
@ -646,7 +648,9 @@ PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
#define OPTION_NO_PLT_ALIGN (OPTION_PLT_ALIGN + 1)
#define OPTION_STUBSYMS (OPTION_NO_PLT_ALIGN + 1)
#define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
#define OPTION_DOTSYMS (OPTION_NO_STUBSYMS + 1)
#define OPTION_SAVRES (OPTION_NO_STUBSYMS + 1)
#define OPTION_NO_SAVRES (OPTION_SAVRES + 1)
#define OPTION_DOTSYMS (OPTION_NO_SAVRES + 1)
#define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
#define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
#define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
@ -669,6 +673,8 @@ PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
{ "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
{ "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
{ "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
{ "save-restore-funcs", no_argument, NULL, OPTION_SAVRES },
{ "no-save-restore-funcs", no_argument, NULL, OPTION_NO_SAVRES },
{ "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
{ "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },
{ "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT },
@ -723,6 +729,14 @@ PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
--no-dotsyms Don'\''t do anything special in version scripts.\n"
));
fprintf (file, _("\
--save-restore-funcs Provide register save and restore routines used\n\
by gcc -Os code. Defaults to on for normal\n\
final link, off for ld -r.\n"
));
fprintf (file, _("\
--no-save-restore-funcs Don'\''t provide these routines.\n"
));
fprintf (file, _("\
--no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
));
fprintf (file, _("\
@ -805,6 +819,14 @@ PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
dotsyms = 0;
break;
case OPTION_SAVRES:
params.save_restore_funcs = 1;
break;
case OPTION_NO_SAVRES:
params.save_restore_funcs = 0;
break;
case OPTION_NO_TLS_OPT:
no_tls_opt = 1;
break;