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x86/power: Support objtool validation in hibernate_asm_64.S

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The OBJECT_FILES_NON_STANDARD annotation is used to tell objtool to
ignore a file.  File-level ignores won't work when validating vmlinux.o.

Instead, convert restore_image() and core_restore_code() to be ELF
functions.  Their code is conventional enough for objtool to be able to
understand them.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/974f8ceb5385e470f72e93974c70ab5c894bb0dc.1611263462.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2021-01-21 15:29:36 -06:00
parent 125f0b7d24
commit 9077c016a3
2 changed files with 4 additions and 5 deletions
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1
arch/x86/power/Makefile
View file

@ -1,5 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
OBJECT_FILES_NON_STANDARD_hibernate_asm_$(BITS).o := y
# __restore_processor_state() restores %gs after S3 resume and so should not
# itself be stack-protected

8
arch/x86/power/hibernate_asm_64.S
View file

@ -99,7 +99,7 @@ SYM_FUNC_START(swsusp_arch_suspend)
ret
SYM_FUNC_END(swsusp_arch_suspend)
SYM_CODE_START(restore_image)
SYM_FUNC_START(restore_image)
/* prepare to jump to the image kernel */
movq restore_jump_address(%rip), %r8
movq restore_cr3(%rip), %r9
@ -115,10 +115,10 @@ SYM_CODE_START(restore_image)
movq relocated_restore_code(%rip), %rcx
ANNOTATE_RETPOLINE_SAFE
jmpq *%rcx
SYM_CODE_END(restore_image)
SYM_FUNC_END(restore_image)
/* code below has been relocated to a safe page */
SYM_CODE_START(core_restore_code)
SYM_FUNC_START(core_restore_code)
/* switch to temporary page tables */
movq %rax, %cr3
/* flush TLB */
@ -147,4 +147,4 @@ SYM_CODE_START(core_restore_code)
/* jump to the restore_registers address from the image header */
ANNOTATE_RETPOLINE_SAFE
jmpq *%r8
SYM_CODE_END(core_restore_code)
SYM_FUNC_END(core_restore_code)