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Subject[PATCH v8 05/28] x86/asm: annotate local pseudo-functions
Date
Use the newly added SYM_CODE_START_LOCAL* to annotate starts of all
pseudo-functions (those ending END until now) which do not have ".globl"
annotation. This is needed to balance END for tools that generate
debuginfo. Note that we switch from END to SYM_CODE_END too so that
everybody can see the pairing.

We are not annotating C-like functions (which handle frame ptr etc.)
here, hence we use SYM_CODE_* macros here, not SYM_FUNC_*. Note that
early_idt_handler_common already had ENDPROC -- switch that to
SYM_CODE_END for the same reason as above.

bogus_64_magic, bad_address, 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).

[v3] annotate more functions
[v4] describe the alignments changes

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <x86@kernel.org>
---
arch/x86/entry/entry_64.S | 3 ++-
arch/x86/kernel/acpi/wakeup_64.S | 3 ++-
arch/x86/kernel/head_32.S | 4 ++--
arch/x86/kernel/head_64.S | 4 ++--
arch/x86/kernel/verify_cpu.S | 4 ++--
arch/x86/lib/getuser.S | 6 ++++--
arch/x86/lib/putuser.S | 3 ++-
7 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 9701464341e4..68cb3a9ee65e 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1059,7 +1059,7 @@ EXPORT_SYMBOL(native_load_gs_index)
_ASM_EXTABLE(.Lgs_change, bad_gs)
.section .fixup, "ax"
/* running with kernelgs */
-bad_gs:
+SYM_CODE_START_LOCAL_NOALIGN(bad_gs)
SWAPGS /* switch back to user gs */
.macro ZAP_GS
/* This can't be a string because the preprocessor needs to see it. */
@@ -1070,6 +1070,7 @@ bad_gs:
xorl %eax, %eax
movl %eax, %gs
jmp 2b
+SYM_CODE_END(bad_gs)
.previous

/* Call softirq on interrupt stack. Interrupts are off. */
diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
index a142c5ee0d4f..9f1852428a2d 100644
--- a/arch/x86/kernel/acpi/wakeup_64.S
+++ b/arch/x86/kernel/acpi/wakeup_64.S
@@ -37,8 +37,9 @@ ENTRY(wakeup_long64)
jmp *%rax
ENDPROC(wakeup_long64)

-bogus_64_magic:
+SYM_CODE_START_LOCAL(bogus_64_magic)
jmp bogus_64_magic
+SYM_CODE_END(bogus_64_magic)

ENTRY(do_suspend_lowlevel)
FRAME_BEGIN
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index d1e213da4782..0bae769b7b59 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -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)
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 6c1bf7ae55ff..6fedcda37634 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -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)

__INITDATA

diff --git a/arch/x86/kernel/verify_cpu.S b/arch/x86/kernel/verify_cpu.S
index a024c4f7ba56..641f0fe1e5b4 100644
--- a/arch/x86/kernel/verify_cpu.S
+++ b/arch/x86/kernel/verify_cpu.S
@@ -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)
diff --git a/arch/x86/lib/getuser.S b/arch/x86/lib/getuser.S
index 304f958c27b2..494d6d24e19e 100644
--- a/arch/x86/lib/getuser.S
+++ b/arch/x86/lib/getuser.S
@@ -115,21 +115,23 @@ ENDPROC(__get_user_8)
EXPORT_SYMBOL(__get_user_8)


-bad_get_user_clac:
+SYM_CODE_START_LOCAL(bad_get_user_clac)
ASM_CLAC
bad_get_user:
xor %edx,%edx
mov $(-EFAULT),%_ASM_AX
ret
+SYM_CODE_END(bad_get_user_clac)

#ifdef CONFIG_X86_32
-bad_get_user_8_clac:
+SYM_CODE_START_LOCAL(bad_get_user_8_clac)
ASM_CLAC
bad_get_user_8:
xor %edx,%edx
xor %ecx,%ecx
mov $(-EFAULT),%_ASM_AX
ret
+SYM_CODE_END(bad_get_user_8_clac)
#endif

_ASM_EXTABLE_UA(1b, bad_get_user_clac)
diff --git a/arch/x86/lib/putuser.S b/arch/x86/lib/putuser.S
index 14bf78341d3c..adeabbdd13cf 100644
--- a/arch/x86/lib/putuser.S
+++ b/arch/x86/lib/putuser.S
@@ -91,11 +91,12 @@ ENTRY(__put_user_8)
ENDPROC(__put_user_8)
EXPORT_SYMBOL(__put_user_8)

-bad_put_user_clac:
+SYM_CODE_START_LOCAL(bad_put_user_clac)
ASM_CLAC
bad_put_user:
movl $-EFAULT,%eax
RET
+SYM_CODE_END(bad_put_user_clac)

_ASM_EXTABLE_UA(1b, bad_put_user_clac)
_ASM_EXTABLE_UA(2b, bad_put_user_clac)
--
2.22.0
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