2016-02-03 22:58:10 +08:00
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/* ld script to make ARM Linux kernel
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* taken from the i386 version by Russell King
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* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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*/
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#include <asm-generic/vmlinux.lds.h>
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#include <asm/cache.h>
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#include <asm/thread_info.h>
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#include <asm/memory.h>
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#include <asm/page.h>
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#define PROC_INFO \
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. = ALIGN(4); \
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VMLINUX_SYMBOL(__proc_info_begin) = .; \
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*(.proc.info.init) \
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VMLINUX_SYMBOL(__proc_info_end) = .;
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#define IDMAP_TEXT \
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ALIGN_FUNCTION(); \
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VMLINUX_SYMBOL(__idmap_text_start) = .; \
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*(.idmap.text) \
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VMLINUX_SYMBOL(__idmap_text_end) = .; \
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. = ALIGN(PAGE_SIZE); \
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VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \
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*(.hyp.idmap.text) \
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VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;
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#ifdef CONFIG_HOTPLUG_CPU
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#define ARM_CPU_DISCARD(x)
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#define ARM_CPU_KEEP(x) x
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#else
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#define ARM_CPU_DISCARD(x) x
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#define ARM_CPU_KEEP(x)
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#endif
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#if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \
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defined(CONFIG_GENERIC_BUG)
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#define ARM_EXIT_KEEP(x) x
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#define ARM_EXIT_DISCARD(x)
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#else
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#define ARM_EXIT_KEEP(x)
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#define ARM_EXIT_DISCARD(x) x
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#endif
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OUTPUT_ARCH(arm)
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ENTRY(stext)
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#ifndef __ARMEB__
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jiffies = jiffies_64;
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#else
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jiffies = jiffies_64 + 4;
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#endif
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SECTIONS
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{
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/*
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* XXX: The linker does not define how output sections are
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* assigned to input sections when there are multiple statements
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* matching the same input section name. There is no documented
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* order of matching.
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*
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* unwind exit sections must be discarded before the rest of the
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* unwind sections get included.
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*/
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/DISCARD/ : {
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*(.ARM.exidx.exit.text)
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*(.ARM.extab.exit.text)
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ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
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ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
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ARM_EXIT_DISCARD(EXIT_TEXT)
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ARM_EXIT_DISCARD(EXIT_DATA)
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EXIT_CALL
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#ifndef CONFIG_MMU
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*(.text.fixup)
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*(__ex_table)
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#endif
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#ifndef CONFIG_SMP_ON_UP
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*(.alt.smp.init)
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#endif
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*(.discard)
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*(.discard.*)
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}
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. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
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2016-02-10 02:34:43 +08:00
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_xiprom = .; /* XIP ROM area to be mapped */
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2016-02-03 22:58:10 +08:00
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.head.text : {
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_text = .;
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HEAD_TEXT
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}
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.text : { /* Real text segment */
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_stext = .; /* Text and read-only data */
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IDMAP_TEXT
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__exception_text_start = .;
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*(.exception.text)
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__exception_text_end = .;
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IRQENTRY_TEXT
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TEXT_TEXT
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SCHED_TEXT
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LOCK_TEXT
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KPROBES_TEXT
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*(.gnu.warning)
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*(.glue_7)
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*(.glue_7t)
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. = ALIGN(4);
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*(.got) /* Global offset table */
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ARM_CPU_KEEP(PROC_INFO)
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}
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RO_DATA(PAGE_SIZE)
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. = ALIGN(4);
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__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
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__start___ex_table = .;
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#ifdef CONFIG_MMU
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*(__ex_table)
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#endif
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__stop___ex_table = .;
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}
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#ifdef CONFIG_ARM_UNWIND
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/*
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* Stack unwinding tables
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*/
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. = ALIGN(8);
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.ARM.unwind_idx : {
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__start_unwind_idx = .;
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*(.ARM.exidx*)
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__stop_unwind_idx = .;
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}
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.ARM.unwind_tab : {
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__start_unwind_tab = .;
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*(.ARM.extab*)
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__stop_unwind_tab = .;
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}
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#endif
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NOTES
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_etext = .; /* End of text and rodata section */
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/*
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* The vectors and stubs are relocatable code, and the
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* only thing that matters is their relative offsets
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*/
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__vectors_start = .;
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ARM: 8515/2: move .vectors and .stubs sections back into the kernel VMA
Commit b9b32bf70f2f ("ARM: use linker magic for vectors and vector stubs")
updated the linker script to emit the .vectors and .stubs sections into a
VMA range that is zero based and disjoint from the normal static kernel
region. The reason for that was that this way, the sections can be placed
exactly 4 KB apart, while the payload of the .vectors section is only 32
bytes.
Since the symbols that are part of the .stubs section are emitted into the
kallsyms table, they appear with zero based addresses as well, e.g.,
00001004 t vector_rst
00001020 t vector_irq
000010a0 t vector_dabt
00001120 t vector_pabt
000011a0 t vector_und
00001220 t vector_addrexcptn
00001240 t vector_fiq
00001240 T vector_fiq_offset
As this confuses perf when it accesses the kallsyms tables, commit
7122c3e9154b ("scripts/link-vmlinux.sh: only filter kernel symbols for
arm") implemented a somewhat ugly special case for ARM, where the value
of CONFIG_PAGE_OFFSET is passed to scripts/kallsyms, and symbols whose
addresses are below it are filtered out. Note that this special case only
applies to CONFIG_XIP_KERNEL=n, not because the issue the patch addresses
exists only in that case, but because finding a limit below which to apply
the filtering is not entirely straightforward.
Since the .vectors and .stubs sections contain position independent code
that is never executed in place, we can emit it at its most likely runtime
VMA (for more recent CPUs), which is 0xffff0000 for the vector table and
0xffff1000 for the stubs. Not only does this fix the perf issue with
kallsyms, allowing us to drop the special case in scripts/kallsyms
entirely, it also gives debuggers a more realistic view of the address
space, and setting breakpoints or single stepping through code in the
vector table or the stubs is more likely to work as expected on CPUs that
use a high vector address. E.g.,
00001240 A vector_fiq_offset
...
c0c35000 T __init_begin
c0c35000 T __vectors_start
c0c35020 T __stubs_start
c0c35020 T __vectors_end
c0c352e0 T _sinittext
c0c352e0 T __stubs_end
...
ffff1004 t vector_rst
ffff1020 t vector_irq
ffff10a0 t vector_dabt
ffff1120 t vector_pabt
ffff11a0 t vector_und
ffff1220 t vector_addrexcptn
ffff1240 T vector_fiq
(Note that vector_fiq_offset is now an absolute symbol, which kallsyms
already ignores by default)
The LMA footprint is identical with or without this change, only the VMAs
are different:
Before:
Idx Name Size VMA LMA File off Algn
...
14 .notes 00000024 c0c34020 c0c34020 00a34020 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
15 .vectors 00000020 00000000 c0c35000 00a40000 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
16 .stubs 000002c0 00001000 c0c35020 00a41000 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
17 .init.text 0006b1b8 c0c352e0 c0c352e0 00a452e0 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
...
After:
Idx Name Size VMA LMA File off Algn
...
14 .notes 00000024 c0c34020 c0c34020 00a34020 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
15 .vectors 00000020 ffff0000 c0c35000 00a40000 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
16 .stubs 000002c0 ffff1000 c0c35020 00a41000 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
17 .init.text 0006b1b8 c0c352e0 c0c352e0 00a452e0 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
...
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2016-02-10 18:41:08 +08:00
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.vectors 0xffff0000 : AT(__vectors_start) {
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2016-02-03 22:58:10 +08:00
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*(.vectors)
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}
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. = __vectors_start + SIZEOF(.vectors);
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__vectors_end = .;
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__stubs_start = .;
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ARM: 8515/2: move .vectors and .stubs sections back into the kernel VMA
Commit b9b32bf70f2f ("ARM: use linker magic for vectors and vector stubs")
updated the linker script to emit the .vectors and .stubs sections into a
VMA range that is zero based and disjoint from the normal static kernel
region. The reason for that was that this way, the sections can be placed
exactly 4 KB apart, while the payload of the .vectors section is only 32
bytes.
Since the symbols that are part of the .stubs section are emitted into the
kallsyms table, they appear with zero based addresses as well, e.g.,
00001004 t vector_rst
00001020 t vector_irq
000010a0 t vector_dabt
00001120 t vector_pabt
000011a0 t vector_und
00001220 t vector_addrexcptn
00001240 t vector_fiq
00001240 T vector_fiq_offset
As this confuses perf when it accesses the kallsyms tables, commit
7122c3e9154b ("scripts/link-vmlinux.sh: only filter kernel symbols for
arm") implemented a somewhat ugly special case for ARM, where the value
of CONFIG_PAGE_OFFSET is passed to scripts/kallsyms, and symbols whose
addresses are below it are filtered out. Note that this special case only
applies to CONFIG_XIP_KERNEL=n, not because the issue the patch addresses
exists only in that case, but because finding a limit below which to apply
the filtering is not entirely straightforward.
Since the .vectors and .stubs sections contain position independent code
that is never executed in place, we can emit it at its most likely runtime
VMA (for more recent CPUs), which is 0xffff0000 for the vector table and
0xffff1000 for the stubs. Not only does this fix the perf issue with
kallsyms, allowing us to drop the special case in scripts/kallsyms
entirely, it also gives debuggers a more realistic view of the address
space, and setting breakpoints or single stepping through code in the
vector table or the stubs is more likely to work as expected on CPUs that
use a high vector address. E.g.,
00001240 A vector_fiq_offset
...
c0c35000 T __init_begin
c0c35000 T __vectors_start
c0c35020 T __stubs_start
c0c35020 T __vectors_end
c0c352e0 T _sinittext
c0c352e0 T __stubs_end
...
ffff1004 t vector_rst
ffff1020 t vector_irq
ffff10a0 t vector_dabt
ffff1120 t vector_pabt
ffff11a0 t vector_und
ffff1220 t vector_addrexcptn
ffff1240 T vector_fiq
(Note that vector_fiq_offset is now an absolute symbol, which kallsyms
already ignores by default)
The LMA footprint is identical with or without this change, only the VMAs
are different:
Before:
Idx Name Size VMA LMA File off Algn
...
14 .notes 00000024 c0c34020 c0c34020 00a34020 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
15 .vectors 00000020 00000000 c0c35000 00a40000 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
16 .stubs 000002c0 00001000 c0c35020 00a41000 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
17 .init.text 0006b1b8 c0c352e0 c0c352e0 00a452e0 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
...
After:
Idx Name Size VMA LMA File off Algn
...
14 .notes 00000024 c0c34020 c0c34020 00a34020 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
15 .vectors 00000020 ffff0000 c0c35000 00a40000 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
16 .stubs 000002c0 ffff1000 c0c35020 00a41000 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
17 .init.text 0006b1b8 c0c352e0 c0c352e0 00a452e0 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
...
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2016-02-10 18:41:08 +08:00
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.stubs ADDR(.vectors) + 0x1000 : AT(__stubs_start) {
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2016-02-03 22:58:10 +08:00
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*(.stubs)
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}
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. = __stubs_start + SIZEOF(.stubs);
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__stubs_end = .;
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ARM: 8515/2: move .vectors and .stubs sections back into the kernel VMA
Commit b9b32bf70f2f ("ARM: use linker magic for vectors and vector stubs")
updated the linker script to emit the .vectors and .stubs sections into a
VMA range that is zero based and disjoint from the normal static kernel
region. The reason for that was that this way, the sections can be placed
exactly 4 KB apart, while the payload of the .vectors section is only 32
bytes.
Since the symbols that are part of the .stubs section are emitted into the
kallsyms table, they appear with zero based addresses as well, e.g.,
00001004 t vector_rst
00001020 t vector_irq
000010a0 t vector_dabt
00001120 t vector_pabt
000011a0 t vector_und
00001220 t vector_addrexcptn
00001240 t vector_fiq
00001240 T vector_fiq_offset
As this confuses perf when it accesses the kallsyms tables, commit
7122c3e9154b ("scripts/link-vmlinux.sh: only filter kernel symbols for
arm") implemented a somewhat ugly special case for ARM, where the value
of CONFIG_PAGE_OFFSET is passed to scripts/kallsyms, and symbols whose
addresses are below it are filtered out. Note that this special case only
applies to CONFIG_XIP_KERNEL=n, not because the issue the patch addresses
exists only in that case, but because finding a limit below which to apply
the filtering is not entirely straightforward.
Since the .vectors and .stubs sections contain position independent code
that is never executed in place, we can emit it at its most likely runtime
VMA (for more recent CPUs), which is 0xffff0000 for the vector table and
0xffff1000 for the stubs. Not only does this fix the perf issue with
kallsyms, allowing us to drop the special case in scripts/kallsyms
entirely, it also gives debuggers a more realistic view of the address
space, and setting breakpoints or single stepping through code in the
vector table or the stubs is more likely to work as expected on CPUs that
use a high vector address. E.g.,
00001240 A vector_fiq_offset
...
c0c35000 T __init_begin
c0c35000 T __vectors_start
c0c35020 T __stubs_start
c0c35020 T __vectors_end
c0c352e0 T _sinittext
c0c352e0 T __stubs_end
...
ffff1004 t vector_rst
ffff1020 t vector_irq
ffff10a0 t vector_dabt
ffff1120 t vector_pabt
ffff11a0 t vector_und
ffff1220 t vector_addrexcptn
ffff1240 T vector_fiq
(Note that vector_fiq_offset is now an absolute symbol, which kallsyms
already ignores by default)
The LMA footprint is identical with or without this change, only the VMAs
are different:
Before:
Idx Name Size VMA LMA File off Algn
...
14 .notes 00000024 c0c34020 c0c34020 00a34020 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
15 .vectors 00000020 00000000 c0c35000 00a40000 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
16 .stubs 000002c0 00001000 c0c35020 00a41000 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
17 .init.text 0006b1b8 c0c352e0 c0c352e0 00a452e0 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
...
After:
Idx Name Size VMA LMA File off Algn
...
14 .notes 00000024 c0c34020 c0c34020 00a34020 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
15 .vectors 00000020 ffff0000 c0c35000 00a40000 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
16 .stubs 000002c0 ffff1000 c0c35020 00a41000 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
17 .init.text 0006b1b8 c0c352e0 c0c352e0 00a452e0 2**5
CONTENTS, ALLOC, LOAD, READONLY, CODE
...
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2016-02-10 18:41:08 +08:00
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PROVIDE(vector_fiq_offset = vector_fiq - ADDR(.vectors));
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2016-02-03 22:58:10 +08:00
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INIT_TEXT_SECTION(8)
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.exit.text : {
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ARM_EXIT_KEEP(EXIT_TEXT)
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}
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.init.proc.info : {
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ARM_CPU_DISCARD(PROC_INFO)
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}
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.init.arch.info : {
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__arch_info_begin = .;
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*(.arch.info.init)
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__arch_info_end = .;
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}
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.init.tagtable : {
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__tagtable_begin = .;
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*(.taglist.init)
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__tagtable_end = .;
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}
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#ifdef CONFIG_SMP_ON_UP
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|
.init.smpalt : {
|
|
|
|
|
__smpalt_begin = .;
|
|
|
|
|
*(.alt.smp.init)
|
|
|
|
|
__smpalt_end = .;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
.init.pv_table : {
|
|
|
|
|
__pv_table_begin = .;
|
|
|
|
|
*(.pv_table)
|
|
|
|
|
__pv_table_end = .;
|
|
|
|
|
}
|
|
|
|
|
.init.data : {
|
|
|
|
|
INIT_SETUP(16)
|
|
|
|
|
INIT_CALLS
|
|
|
|
|
CON_INITCALL
|
|
|
|
|
SECURITY_INITCALL
|
|
|
|
|
INIT_RAM_FS
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
|
PERCPU_SECTION(L1_CACHE_BYTES)
|
|
|
|
|
#endif
|
|
|
|
|
|
2016-02-10 02:34:43 +08:00
|
|
|
_exiprom = .; /* End of XIP ROM area */
|
2016-02-03 22:58:10 +08:00
|
|
|
__data_loc = ALIGN(4); /* location in binary */
|
|
|
|
|
. = PAGE_OFFSET + TEXT_OFFSET;
|
|
|
|
|
|
|
|
|
|
.data : AT(__data_loc) {
|
|
|
|
|
_data = .; /* address in memory */
|
|
|
|
|
_sdata = .;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* first, the init task union, aligned
|
|
|
|
|
* to an 8192 byte boundary.
|
|
|
|
|
*/
|
|
|
|
|
INIT_TASK_DATA(THREAD_SIZE)
|
|
|
|
|
|
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
|
|
|
__init_begin = .;
|
|
|
|
|
INIT_DATA
|
|
|
|
|
ARM_EXIT_KEEP(EXIT_DATA)
|
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
|
|
|
__init_end = .;
|
|
|
|
|
|
|
|
|
|
NOSAVE_DATA
|
|
|
|
|
CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
|
|
|
|
|
READ_MOSTLY_DATA(L1_CACHE_BYTES)
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* and the usual data section
|
|
|
|
|
*/
|
|
|
|
|
DATA_DATA
|
|
|
|
|
CONSTRUCTORS
|
|
|
|
|
|
|
|
|
|
_edata = .;
|
|
|
|
|
}
|
|
|
|
|
_edata_loc = __data_loc + SIZEOF(.data);
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_HAVE_TCM
|
|
|
|
|
/*
|
|
|
|
|
* We align everything to a page boundary so we can
|
|
|
|
|
* free it after init has commenced and TCM contents have
|
|
|
|
|
* been copied to its destination.
|
|
|
|
|
*/
|
|
|
|
|
.tcm_start : {
|
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
|
|
|
__tcm_start = .;
|
|
|
|
|
__itcm_start = .;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Link these to the ITCM RAM
|
|
|
|
|
* Put VMA to the TCM address and LMA to the common RAM
|
|
|
|
|
* and we'll upload the contents from RAM to TCM and free
|
|
|
|
|
* the used RAM after that.
|
|
|
|
|
*/
|
|
|
|
|
.text_itcm ITCM_OFFSET : AT(__itcm_start)
|
|
|
|
|
{
|
|
|
|
|
__sitcm_text = .;
|
|
|
|
|
*(.tcm.text)
|
|
|
|
|
*(.tcm.rodata)
|
|
|
|
|
. = ALIGN(4);
|
|
|
|
|
__eitcm_text = .;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Reset the dot pointer, this is needed to create the
|
|
|
|
|
* relative __dtcm_start below (to be used as extern in code).
|
|
|
|
|
*/
|
|
|
|
|
. = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);
|
|
|
|
|
|
|
|
|
|
.dtcm_start : {
|
|
|
|
|
__dtcm_start = .;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* TODO: add remainder of ITCM as well, that can be used for data! */
|
|
|
|
|
.data_dtcm DTCM_OFFSET : AT(__dtcm_start)
|
|
|
|
|
{
|
|
|
|
|
. = ALIGN(4);
|
|
|
|
|
__sdtcm_data = .;
|
|
|
|
|
*(.tcm.data)
|
|
|
|
|
. = ALIGN(4);
|
|
|
|
|
__edtcm_data = .;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Reset the dot pointer or the linker gets confused */
|
|
|
|
|
. = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);
|
|
|
|
|
|
|
|
|
|
/* End marker for freeing TCM copy in linked object */
|
|
|
|
|
.tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
|
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
|
|
|
__tcm_end = .;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
BSS_SECTION(0, 0, 0)
|
|
|
|
|
_end = .;
|
|
|
|
|
|
|
|
|
|
STABS_DEBUG
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* These must never be empty
|
|
|
|
|
* If you have to comment these two assert statements out, your
|
|
|
|
|
* binutils is too old (for other reasons as well)
|
|
|
|
|
*/
|
|
|
|
|
ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
|
|
|
|
|
ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* The HYP init code can't be more than a page long,
|
|
|
|
|
* and should not cross a page boundary.
|
|
|
|
|
* The above comment applies as well.
|
|
|
|
|
*/
|
|
|
|
|
ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
|
|
|
|
|
"HYP init code too big or misaligned")
|