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x86/kernel: Move ENTRY_TEXT to the start of the image

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Since commit:

  7734a0f31e99 ("x86/boot: Robustify calling startup_{32,64}() from the decompressor code")

it is no longer necessary for .head.text to appear at the start of the
image. Since ENTRY_TEXT needs to appear PMD-aligned, it is easier to
just place it at the start of the image, rather than line it up with the
end of the .text section. The amount of padding required should be the
same, but this arrangement also permits .head.text to be split off and
emitted separately, which is needed by a subsequent change.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lore.kernel.org/r/20241205112804.3416920-14-ardb+git@google.com
This commit is contained in:
Ard Biesheuvel 2024-12-05 12:28:10 +01:00 committed by Ingo Molnar
parent 3b6f99a94b
commit 35350eb689
1 changed files with 13 additions and 13 deletions
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26
arch/x86/kernel/vmlinux.lds.S
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@ -121,19 +121,6 @@ SECTIONS
.text : AT(ADDR(.text) - LOAD_OFFSET) { .text : AT(ADDR(.text) - LOAD_OFFSET) {
_text = .; _text = .;
_stext = .; _stext = .;
/* bootstrapping code */
HEAD_TEXT
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
KPROBES_TEXT
SOFTIRQENTRY_TEXT
#ifdef CONFIG_MITIGATION_RETPOLINE
*(.text..__x86.indirect_thunk)
*(.text..__x86.return_thunk)
#endif
STATIC_CALL_TEXT
ALIGN_ENTRY_TEXT_BEGIN ALIGN_ENTRY_TEXT_BEGIN
*(.text..__x86.rethunk_untrain) *(.text..__x86.rethunk_untrain)
ENTRY_TEXT ENTRY_TEXT
@ -147,6 +134,19 @@ SECTIONS
*(.text..__x86.rethunk_safe) *(.text..__x86.rethunk_safe)
#endif #endif
ALIGN_ENTRY_TEXT_END ALIGN_ENTRY_TEXT_END
/* bootstrapping code */
HEAD_TEXT
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
KPROBES_TEXT
SOFTIRQENTRY_TEXT
#ifdef CONFIG_MITIGATION_RETPOLINE
*(.text..__x86.indirect_thunk)
*(.text..__x86.return_thunk)
#endif
STATIC_CALL_TEXT
*(.gnu.warning) *(.gnu.warning)
} :text = 0xcccccccc } :text = 0xcccccccc