2005-11-04 18:36:59 -05:00
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#ifdef CONFIG_PPC64
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2006-03-28 07:15:54 -05:00
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#define PROVIDE32(x) PROVIDE(__unused__##x)
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2005-11-04 18:36:59 -05:00
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#else
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2006-03-28 07:15:54 -05:00
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#define PROVIDE32(x) PROVIDE(x)
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2005-11-04 18:36:59 -05:00
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#endif
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2008-04-15 15:52:26 -04:00
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#include <asm/page.h>
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2005-09-26 02:04:21 -04:00
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#include <asm-generic/vmlinux.lds.h>
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2007-07-04 00:04:31 -04:00
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#include <asm/cache.h>
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2005-09-26 02:04:21 -04:00
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2005-11-03 00:03:06 -05:00
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ENTRY(_stext)
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2008-07-21 19:03:45 -04:00
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PHDRS {
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kernel PT_LOAD FLAGS(7); /* RWX */
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notes PT_NOTE FLAGS(0);
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dummy PT_NOTE FLAGS(0);
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/* binutils < 2.18 has a bug that makes it misbehave when taking an
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ELF file with all segments at load address 0 as input. This
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happens when running "strip" on vmlinux, because of the AT() magic
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in this linker script. People using GCC >= 4.2 won't run into
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this problem, because the "build-id" support will put some data
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into the "notes" segment (at a non-zero load address).
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To work around this, we force some data into both the "dummy"
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segment and the kernel segment, so the dummy segment will get a
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non-zero load address. It's not enough to always create the
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"notes" segment, since if nothing gets assigned to it, its load
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address will be zero. */
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}
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2005-09-30 02:16:52 -04:00
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#ifdef CONFIG_PPC64
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OUTPUT_ARCH(powerpc:common64)
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jiffies = jiffies_64;
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#else
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2005-09-26 02:04:21 -04:00
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OUTPUT_ARCH(powerpc:common)
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jiffies = jiffies_64 + 4;
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2005-09-30 02:16:52 -04:00
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#endif
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2005-09-26 02:04:21 -04:00
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SECTIONS
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{
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2006-03-28 07:15:54 -05:00
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/* Sections to be discarded. */
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/DISCARD/ : {
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*(.exitcall.exit)
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2008-01-20 08:15:03 -05:00
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EXIT_DATA
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2006-03-28 07:15:54 -05:00
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}
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2005-09-26 02:04:21 -04:00
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2006-03-28 07:15:54 -05:00
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. = KERNELBASE;
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2005-09-26 02:04:21 -04:00
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2006-03-28 07:15:54 -05:00
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/*
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* Text, read only data and other permanent read-only sections
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*/
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/* Text and gots */
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2008-04-15 15:52:28 -04:00
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.text : AT(ADDR(.text) - LOAD_OFFSET) {
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2007-09-13 16:42:35 -04:00
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ALIGN_FUNCTION();
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*(.text.head)
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2006-12-06 20:14:04 -05:00
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_text = .;
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powerpc: Introduce infrastructure for feature sections with alternatives
The current feature section logic only supports nop'ing out code, this means
if you want to choose at runtime between instruction sequences, one or both
cases will have to execute the nop'ed out contents of the other section, eg:
BEGIN_FTR_SECTION
or 1,1,1
END_FTR_SECTION_IFSET(FOO)
BEGIN_FTR_SECTION
or 2,2,2
END_FTR_SECTION_IFCLR(FOO)
and the resulting code will be either,
or 1,1,1
nop
or,
nop
or 2,2,2
For small code segments this is fine, but for larger code blocks and in
performance criticial code segments, it would be nice to avoid the nops.
This commit starts to implement logic to allow the following:
BEGIN_FTR_SECTION
or 1,1,1
FTR_SECTION_ELSE
or 2,2,2
ALT_FTR_SECTION_END_IFSET(FOO)
and the resulting code will be:
or 1,1,1
or,
or 2,2,2
We achieve this by extending the existing FTR macros. The current feature
section semantic just becomes a special case, ie. if the else case is empty
we nop out the default case.
The key limitation is that the size of the else case must be less than or
equal to the size of the default case. If the else case is smaller the
remainder of the section is nop'ed.
We let the linker put the else case code in with the rest of the text,
so that relative branches from the else case are more likley to link,
this has the disadvantage that we can't free the unused else cases.
This commit introduces the required macro and linker script changes, but
does not enable the patching of the alternative sections.
We also need to update two hand-made section entries in reg.h and timex.h
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-06-23 21:32:54 -04:00
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*(.text .fixup .text.init.refok .exit.text.refok __ftr_alt_*)
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2006-03-28 07:15:54 -05:00
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SCHED_TEXT
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LOCK_TEXT
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KPROBES_TEXT
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2005-09-26 02:04:21 -04:00
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2006-03-28 07:15:54 -05:00
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#ifdef CONFIG_PPC32
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*(.got1)
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__got2_start = .;
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*(.got2)
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__got2_end = .;
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#endif /* CONFIG_PPC32 */
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. = ALIGN(PAGE_SIZE);
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_etext = .;
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PROVIDE32 (etext = .);
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2008-07-21 19:03:45 -04:00
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} :kernel
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2006-03-28 07:15:54 -05:00
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/* Read-only data */
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RODATA
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/* Exception & bug tables */
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2008-04-15 15:52:28 -04:00
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__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
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2005-09-26 02:04:21 -04:00
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__start___ex_table = .;
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*(__ex_table)
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__stop___ex_table = .;
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}
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2008-07-21 19:03:45 -04:00
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NOTES :kernel :notes
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/* The dummy segment contents for the bug workaround mentioned above
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near PHDRS. */
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2008-07-24 20:08:41 -04:00
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.dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
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2008-07-21 19:03:45 -04:00
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LONG(0xf177)
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} :kernel :dummy
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2007-07-19 04:48:38 -04:00
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2006-03-28 07:15:54 -05:00
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/*
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* Init sections discarded at runtime
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*/
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. = ALIGN(PAGE_SIZE);
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__init_begin = .;
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2008-04-15 15:52:28 -04:00
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.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
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2006-03-28 07:15:54 -05:00
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_sinittext = .;
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2008-01-20 08:15:03 -05:00
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INIT_TEXT
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2006-03-28 07:15:54 -05:00
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_einittext = .;
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2008-07-21 19:03:45 -04:00
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} :kernel
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2006-03-28 07:15:54 -05:00
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/* .exit.text is discarded at runtime, not link time,
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* to deal with references from __bug_table
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*/
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2008-04-15 15:52:28 -04:00
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.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
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2008-01-20 08:15:03 -05:00
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EXIT_TEXT
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}
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2006-03-28 07:15:54 -05:00
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2008-04-15 15:52:28 -04:00
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.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
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2008-01-20 08:15:03 -05:00
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INIT_DATA
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2006-03-28 07:15:54 -05:00
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__vtop_table_begin = .;
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*(.vtop_fixup);
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__vtop_table_end = .;
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__ptov_table_begin = .;
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*(.ptov_fixup);
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__ptov_table_end = .;
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2006-05-19 03:04:48 -04:00
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#ifdef CONFIG_PPC_ISERIES
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__dt_strings_start = .;
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*(.dt_strings);
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__dt_strings_end = .;
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#endif
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2006-03-28 07:15:54 -05:00
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}
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. = ALIGN(16);
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2008-04-15 15:52:28 -04:00
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.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
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2006-03-28 07:15:54 -05:00
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__setup_start = .;
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*(.init.setup)
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__setup_end = .;
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}
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2008-04-15 15:52:28 -04:00
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.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
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2006-03-28 07:15:54 -05:00
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__initcall_start = .;
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2006-10-27 14:41:44 -04:00
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INITCALLS
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2006-03-28 07:15:54 -05:00
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__initcall_end = .;
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}
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2008-04-15 15:52:28 -04:00
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.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
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2006-03-28 07:15:54 -05:00
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__con_initcall_start = .;
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*(.con_initcall.init)
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__con_initcall_end = .;
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}
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SECURITY_INIT
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. = ALIGN(8);
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2008-04-15 15:52:28 -04:00
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__ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
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2005-09-30 02:16:52 -04:00
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__start___ftr_fixup = .;
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*(__ftr_fixup)
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__stop___ftr_fixup = .;
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}
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2008-07-01 11:16:40 -04:00
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. = ALIGN(8);
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__lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
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__start___lwsync_fixup = .;
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*(__lwsync_fixup)
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__stop___lwsync_fixup = .;
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}
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2006-09-25 04:19:00 -04:00
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#ifdef CONFIG_PPC64
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. = ALIGN(8);
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2008-04-15 15:52:28 -04:00
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__fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
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2006-09-25 04:19:00 -04:00
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__start___fw_ftr_fixup = .;
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*(__fw_ftr_fixup)
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__stop___fw_ftr_fixup = .;
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}
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#endif
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2007-02-10 04:44:44 -05:00
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#ifdef CONFIG_BLK_DEV_INITRD
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2006-03-28 07:15:54 -05:00
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. = ALIGN(PAGE_SIZE);
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2008-04-15 15:52:28 -04:00
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.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
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2006-03-28 07:15:54 -05:00
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__initramfs_start = .;
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*(.init.ramfs)
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__initramfs_end = .;
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}
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2007-02-10 04:44:44 -05:00
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#endif
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2007-05-02 13:27:12 -04:00
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. = ALIGN(PAGE_SIZE);
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2008-04-15 15:52:28 -04:00
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.data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
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2006-03-28 07:15:54 -05:00
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__per_cpu_start = .;
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*(.data.percpu)
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2007-07-19 04:48:12 -04:00
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*(.data.percpu.shared_aligned)
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2006-03-28 07:15:54 -05:00
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__per_cpu_end = .;
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}
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2005-09-26 02:04:21 -04:00
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2006-03-28 07:15:54 -05:00
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. = ALIGN(8);
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2008-04-15 15:52:28 -04:00
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.machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
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2006-03-28 07:15:54 -05:00
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__machine_desc_start = . ;
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*(.machine.desc)
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__machine_desc_end = . ;
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}
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/* freed after init ends here */
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. = ALIGN(PAGE_SIZE);
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__init_end = .;
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/*
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* And now the various read/write data
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*/
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. = ALIGN(PAGE_SIZE);
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_sdata = .;
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2005-09-26 02:04:21 -04:00
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2005-09-30 02:16:52 -04:00
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#ifdef CONFIG_PPC32
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2008-04-15 15:52:28 -04:00
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.data : AT(ADDR(.data) - LOAD_OFFSET) {
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2007-05-17 07:38:44 -04:00
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DATA_DATA
|
2006-03-28 07:15:54 -05:00
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*(.sdata)
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*(.got.plt) *(.got)
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}
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2005-09-30 02:16:52 -04:00
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#else
|
2008-04-15 15:52:28 -04:00
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.data : AT(ADDR(.data) - LOAD_OFFSET) {
|
2007-06-16 22:29:04 -04:00
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DATA_DATA
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*(.data.rel*)
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*(.toc1)
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2006-03-28 07:15:54 -05:00
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*(.branch_lt)
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}
|
2005-09-26 02:04:21 -04:00
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2008-04-15 15:52:28 -04:00
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.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
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2006-03-28 07:15:54 -05:00
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*(.opd)
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}
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|
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2008-04-15 15:52:28 -04:00
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.got : AT(ADDR(.got) - LOAD_OFFSET) {
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2006-03-28 07:15:54 -05:00
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__toc_start = .;
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*(.got)
|
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*(.toc)
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}
|
2005-09-30 02:16:52 -04:00
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#endif
|
2005-09-26 02:04:21 -04:00
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2006-03-28 07:15:54 -05:00
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. = ALIGN(PAGE_SIZE);
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_edata = .;
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PROVIDE32 (edata = .);
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/* The initial task and kernel stack */
|
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#ifdef CONFIG_PPC32
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. = ALIGN(8192);
|
2005-09-30 02:16:52 -04:00
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#else
|
2006-03-28 07:15:54 -05:00
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. = ALIGN(16384);
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|
#endif
|
2008-04-15 15:52:28 -04:00
|
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.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
|
2006-03-28 07:15:54 -05:00
|
|
|
*(.data.init_task)
|
|
|
|
}
|
2005-09-26 02:04:21 -04:00
|
|
|
|
2006-03-28 07:15:54 -05:00
|
|
|
. = ALIGN(PAGE_SIZE);
|
2008-04-15 15:52:28 -04:00
|
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.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
|
2006-03-28 07:15:54 -05:00
|
|
|
*(.data.page_aligned)
|
|
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|
}
|
2005-09-26 02:04:21 -04:00
|
|
|
|
2008-04-15 15:52:28 -04:00
|
|
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.data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
|
2006-03-28 07:15:54 -05:00
|
|
|
*(.data.cacheline_aligned)
|
|
|
|
}
|
2005-09-26 02:04:21 -04:00
|
|
|
|
2007-07-04 00:04:31 -04:00
|
|
|
. = ALIGN(L1_CACHE_BYTES);
|
2008-04-15 15:52:28 -04:00
|
|
|
.data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
|
2007-07-04 00:04:31 -04:00
|
|
|
*(.data.read_mostly)
|
|
|
|
}
|
|
|
|
|
2006-03-28 07:15:54 -05:00
|
|
|
. = ALIGN(PAGE_SIZE);
|
2008-04-15 15:52:28 -04:00
|
|
|
.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
|
2006-03-28 07:15:54 -05:00
|
|
|
__nosave_begin = .;
|
|
|
|
*(.data.nosave)
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
|
|
__nosave_end = .;
|
|
|
|
}
|
2005-10-10 08:38:46 -04:00
|
|
|
|
2006-03-28 07:15:54 -05:00
|
|
|
/*
|
|
|
|
* And finally the bss
|
|
|
|
*/
|
|
|
|
|
2008-04-15 15:52:28 -04:00
|
|
|
.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
|
2006-03-28 07:15:54 -05:00
|
|
|
__bss_start = .;
|
|
|
|
*(.sbss) *(.scommon)
|
|
|
|
*(.dynbss)
|
|
|
|
*(.bss)
|
|
|
|
*(COMMON)
|
|
|
|
__bss_stop = .;
|
|
|
|
}
|
2005-09-26 02:04:21 -04:00
|
|
|
|
2006-03-28 07:15:54 -05:00
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|
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. = ALIGN(PAGE_SIZE);
|
|
|
|
_end = . ;
|
|
|
|
PROVIDE32 (end = .);
|
2005-09-26 02:04:21 -04:00
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|
|
}
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