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x86/asm: Annotate local pseudo-functions 

Use the newly added SYM_CODE_START_LOCAL* to annotate beginnings of
all pseudo-functions (those ending with END until now) which do not
have ".globl" annotation. This is needed to balance END for tools that
generate debuginfo. Note that ENDs are switched to SYM_CODE_END too so
that everybody can see the pairing.

C-like functions (which handle frame ptr etc.) are not annotated here,
hence SYM_CODE_* macros are used here, not SYM_FUNC_*. Note that the
32bit version of early_idt_handler_common already had ENDPROC -- switch
that to SYM_CODE_END for the same reason as above (and to be the same as
64bit).

While early_idt_handler_common is LOCAL, it's name is not prepended with
".L" as it happens to appear in call traces.

bad_get_user*, and bad_put_user are now aligned, as they are separate
functions. They do not mind to be aligned -- no need to be compact
there.

early_idt_handler_common is aligned now too, as it is after
early_idt_handler_array, so as well no need to be compact there.

verify_cpu is self-standing and included in other .S files, so align it
too.

The others have alignment preserved to what it used to be (using the
_NOALIGN variant of macros).

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Alexios Zavras <alexios.zavras@intel.com>
Cc: Allison Randal <allison@lohutok.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Cao jin <caoj.fnst@cn.fujitsu.com>
Cc: Enrico Weigelt <info@metux.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: linux-arch@vger.kernel.org
Cc: Maran Wilson <maran.wilson@oracle.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20191011115108.12392-6-jslaby@suse.cz
This commit is contained in:
Jiri Slaby 2019-10-11 13:50:45 +02:00 committed by Borislav Petkov
parent 76dc6d6001
commit ef77e6880b
6 changed files with 14 additions and 10 deletions
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3
arch/x86/entry/entry_64.S
View File

@ -1061,7 +1061,7 @@ EXPORT_SYMBOL(native_load_gs_index)
_ASM_EXTABLE(.Lgs_change, .Lbad_gs)
.section .fixup, "ax"
/* running with kernelgs */
.Lbad_gs:
SYM_CODE_START_LOCAL_NOALIGN(.Lbad_gs)
SWAPGS /* switch back to user gs */
.macro ZAP_GS
/* This can't be a string because the preprocessor needs to see it. */
@ -1072,6 +1072,7 @@ EXPORT_SYMBOL(native_load_gs_index)
xorl %eax, %eax
movl %eax, %gs
jmp 2b
SYM_CODE_END(.Lbad_gs)
.previous
/* Call softirq on interrupt stack. Interrupts are off. */

4
arch/x86/kernel/head_32.S
View File

@ -409,7 +409,7 @@ ENTRY(early_idt_handler_array)
.endr
ENDPROC(early_idt_handler_array)
early_idt_handler_common:
SYM_CODE_START_LOCAL(early_idt_handler_common)
/*
* The stack is the hardware frame, an error code or zero, and the
* vector number.
@ -460,7 +460,7 @@ early_idt_handler_common:
decl %ss:early_recursion_flag
addl $4, %esp /* pop pt_regs->orig_ax */
iret
ENDPROC(early_idt_handler_common)
SYM_CODE_END(early_idt_handler_common)
/* This is the default interrupt "handler" :-) */
ENTRY(early_ignore_irq)

4
arch/x86/kernel/head_64.S
View File

@ -291,7 +291,7 @@ ENTRY(early_idt_handler_array)
UNWIND_HINT_IRET_REGS offset=16
END(early_idt_handler_array)
early_idt_handler_common:
SYM_CODE_START_LOCAL(early_idt_handler_common)
/*
* The stack is the hardware frame, an error code or zero, and the
* vector number.
@ -333,7 +333,7 @@ early_idt_handler_common:
20:
decl early_recursion_flag(%rip)
jmp restore_regs_and_return_to_kernel
END(early_idt_handler_common)
SYM_CODE_END(early_idt_handler_common)
#define NEXT_PAGE(name) \
.balign PAGE_SIZE; \

4
arch/x86/kernel/verify_cpu.S
View File

@ -31,7 +31,7 @@
#include <asm/cpufeatures.h>
#include <asm/msr-index.h>
ENTRY(verify_cpu)
SYM_FUNC_START_LOCAL(verify_cpu)
pushf # Save caller passed flags
push $0 # Kill any dangerous flags
popf
@ -137,4 +137,4 @@ ENTRY(verify_cpu)
popf # Restore caller passed flags
xorl %eax, %eax
ret
ENDPROC(verify_cpu)
SYM_FUNC_END(verify_cpu)

6
arch/x86/lib/getuser.S
View File

@ -115,21 +115,23 @@ ENDPROC(__get_user_8)
EXPORT_SYMBOL(__get_user_8)
.Lbad_get_user_clac:
SYM_CODE_START_LOCAL(.Lbad_get_user_clac)
ASM_CLAC
bad_get_user:
xor %edx,%edx
mov $(-EFAULT),%_ASM_AX
ret
SYM_CODE_END(.Lbad_get_user_clac)
#ifdef CONFIG_X86_32
.Lbad_get_user_8_clac:
SYM_CODE_START_LOCAL(.Lbad_get_user_8_clac)
ASM_CLAC
bad_get_user_8:
xor %edx,%edx
xor %ecx,%ecx
mov $(-EFAULT),%_ASM_AX
ret
SYM_CODE_END(.Lbad_get_user_8_clac)
#endif
_ASM_EXTABLE_UA(1b, .Lbad_get_user_clac)

3
arch/x86/lib/putuser.S
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@ -91,11 +91,12 @@ ENTRY(__put_user_8)
ENDPROC(__put_user_8)
EXPORT_SYMBOL(__put_user_8)
.Lbad_put_user_clac:
SYM_CODE_START_LOCAL(.Lbad_put_user_clac)
ASM_CLAC
.Lbad_put_user:
movl $-EFAULT,%eax
RET
SYM_CODE_END(.Lbad_put_user_clac)
_ASM_EXTABLE_UA(1b, .Lbad_put_user_clac)
_ASM_EXTABLE_UA(2b, .Lbad_put_user_clac)