Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 asm updates from Ingo Molnar:
 "The main changes in this cycle were:

   - Cross-arch changes to move the linker sections for NOTES and
     EXCEPTION_TABLE into the RO_DATA area, where they belong on most
     architectures. (Kees Cook)

   - Switch the x86 linker fill byte from x90 (NOP) to 0xcc (INT3), to
     trap jumps into the middle of those padding areas instead of
     sliding execution. (Kees Cook)

   - A thorough cleanup of symbol definitions within x86 assembler code.
     The rather randomly named macros got streamlined around a
     (hopefully) straightforward naming scheme:

        SYM_START(name, linkage, align...)
        SYM_END(name, sym_type)

        SYM_FUNC_START(name)
        SYM_FUNC_END(name)

        SYM_CODE_START(name)
        SYM_CODE_END(name)

        SYM_DATA_START(name)
        SYM_DATA_END(name)

     etc - with about three times of these basic primitives with some
     label, local symbol or attribute variant, expressed via postfixes.

     No change in functionality intended. (Jiri Slaby)

   - Misc other changes, cleanups and smaller fixes"

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (67 commits)
  x86/entry/64: Remove pointless jump in paranoid_exit
  x86/entry/32: Remove unused resume_userspace label
  x86/build/vdso: Remove meaningless CFLAGS_REMOVE_*.o
  m68k: Convert missed RODATA to RO_DATA
  x86/vmlinux: Use INT3 instead of NOP for linker fill bytes
  x86/mm: Report actual image regions in /proc/iomem
  x86/mm: Report which part of kernel image is freed
  x86/mm: Remove redundant address-of operators on addresses
  xtensa: Move EXCEPTION_TABLE to RO_DATA segment
  powerpc: Move EXCEPTION_TABLE to RO_DATA segment
  parisc: Move EXCEPTION_TABLE to RO_DATA segment
  microblaze: Move EXCEPTION_TABLE to RO_DATA segment
  ia64: Move EXCEPTION_TABLE to RO_DATA segment
  h8300: Move EXCEPTION_TABLE to RO_DATA segment
  c6x: Move EXCEPTION_TABLE to RO_DATA segment
  arm64: Move EXCEPTION_TABLE to RO_DATA segment
  alpha: Move EXCEPTION_TABLE to RO_DATA segment
  x86/vmlinux: Move EXCEPTION_TABLE to RO_DATA segment
  x86/vmlinux: Actually use _etext for the end of the text segment
  vmlinux.lds.h: Allow EXCEPTION_TABLE to live in RO_DATA
  ...

8 files changed, 55 insertions, 54 deletions

diff --git a/arch/x86/realmode/rm/header.S b/arch/x86/realmode/rm/header.S
index 6363761cc74c..af04512c02d9 100644
--- a/arch/x86/realmode/rm/header.S
+++ b/arch/x86/realmode/rm/header.S
@@ -14,7 +14,7 @@
 	.section ".header", "a"
 
 	.balign	16
-GLOBAL(real_mode_header)
+SYM_DATA_START(real_mode_header)
 	.long	pa_text_start
 	.long	pa_ro_end
 	/* SMP trampoline */
@@ -33,11 +33,9 @@ GLOBAL(real_mode_header)
 #ifdef CONFIG_X86_64
 	.long	__KERNEL32_CS
 #endif
-END(real_mode_header)
+SYM_DATA_END(real_mode_header)
 
 	/* End signature, used to verify integrity */
 	.section ".signature","a"
 	.balign 4
-GLOBAL(end_signature)
-	.long	REALMODE_END_SIGNATURE
-END(end_signature)
+SYM_DATA(end_signature, .long REALMODE_END_SIGNATURE)
diff --git a/arch/x86/realmode/rm/reboot.S b/arch/x86/realmode/rm/reboot.S
index cd2f97b9623b..f10515b10e0a 100644
--- a/arch/x86/realmode/rm/reboot.S
+++ b/arch/x86/realmode/rm/reboot.S
@@ -19,7 +19,7 @@
  */
 	.section ".text32", "ax"
 	.code32
-ENTRY(machine_real_restart_asm)
+SYM_CODE_START(machine_real_restart_asm)
 
 #ifdef CONFIG_X86_64
 	/* Switch to trampoline GDT as it is guaranteed < 4 GiB */
@@ -33,7 +33,7 @@ ENTRY(machine_real_restart_asm)
 	movl	%eax, %cr0
 	ljmpl	$__KERNEL32_CS, $pa_machine_real_restart_paging_off
 
-GLOBAL(machine_real_restart_paging_off)
+SYM_INNER_LABEL(machine_real_restart_paging_off, SYM_L_GLOBAL)
 	xorl	%eax, %eax
 	xorl	%edx, %edx
 	movl	$MSR_EFER, %ecx
@@ -63,6 +63,7 @@ GLOBAL(machine_real_restart_paging_off)
 	movl	%ecx, %gs
 	movl	%ecx, %ss
 	ljmpw	$8, $1f
+SYM_CODE_END(machine_real_restart_asm)
 
 /*
  * This is 16-bit protected mode code to disable paging and the cache,
@@ -127,13 +128,13 @@ bios:
 	.section ".rodata", "a"
 
 	.balign	16
-GLOBAL(machine_real_restart_idt)
+SYM_DATA_START(machine_real_restart_idt)
 	.word	0xffff		/* Length - real mode default value */
 	.long	0		/* Base - real mode default value */
-END(machine_real_restart_idt)
+SYM_DATA_END(machine_real_restart_idt)
 
 	.balign	16
-GLOBAL(machine_real_restart_gdt)
+SYM_DATA_START(machine_real_restart_gdt)
 	/* Self-pointer */
 	.word	0xffff		/* Length - real mode default value */
 	.long	pa_machine_real_restart_gdt
@@ -153,4 +154,4 @@ GLOBAL(machine_real_restart_gdt)
 	 * semantics we don't have to reload the segments once CR0.PE = 0.
 	 */
 	.quad	GDT_ENTRY(0x0093, 0x100, 0xffff)
-END(machine_real_restart_gdt)
+SYM_DATA_END(machine_real_restart_gdt)
diff --git a/arch/x86/realmode/rm/stack.S b/arch/x86/realmode/rm/stack.S
index 8d4cb64799ea..0fca64061ad2 100644
--- a/arch/x86/realmode/rm/stack.S
+++ b/arch/x86/realmode/rm/stack.S
@@ -6,15 +6,13 @@
 #include <linux/linkage.h>
 
 	.data
-GLOBAL(HEAP)
-	.long	rm_heap
-GLOBAL(heap_end)
-	.long	rm_stack
+SYM_DATA(HEAP,		.long rm_heap)
+SYM_DATA(heap_end,	.long rm_stack)
 
 	.bss
 	.balign	16
-GLOBAL(rm_heap)
-	.space	2048
-GLOBAL(rm_stack)
+SYM_DATA(rm_heap,	.space 2048)
+
+SYM_DATA_START(rm_stack)
 	.space	2048
-GLOBAL(rm_stack_end)
+SYM_DATA_END_LABEL(rm_stack, SYM_L_GLOBAL, rm_stack_end)
diff --git a/arch/x86/realmode/rm/trampoline_32.S b/arch/x86/realmode/rm/trampoline_32.S
index 1868b158480d..3fad907a179f 100644
--- a/arch/x86/realmode/rm/trampoline_32.S
+++ b/arch/x86/realmode/rm/trampoline_32.S
@@ -29,7 +29,7 @@
 	.code16
 
 	.balign	PAGE_SIZE
-ENTRY(trampoline_start)
+SYM_CODE_START(trampoline_start)
 	wbinvd			# Needed for NUMA-Q should be harmless for others
 
 	LJMPW_RM(1f)
@@ -54,18 +54,20 @@ ENTRY(trampoline_start)
 	lmsw	%dx			# into protected mode
 
 	ljmpl	$__BOOT_CS, $pa_startup_32
+SYM_CODE_END(trampoline_start)
 
 	.section ".text32","ax"
 	.code32
-ENTRY(startup_32)			# note: also used from wakeup_asm.S
+SYM_CODE_START(startup_32)			# note: also used from wakeup_asm.S
 	jmp	*%eax
+SYM_CODE_END(startup_32)
 
 	.bss
 	.balign 8
-GLOBAL(trampoline_header)
-	tr_start:		.space	4
-	tr_gdt_pad:		.space	2
-	tr_gdt:			.space	6
-END(trampoline_header)
+SYM_DATA_START(trampoline_header)
+	SYM_DATA_LOCAL(tr_start,	.space 4)
+	SYM_DATA_LOCAL(tr_gdt_pad,	.space 2)
+	SYM_DATA_LOCAL(tr_gdt,		.space 6)
+SYM_DATA_END(trampoline_header)
 	
 #include "trampoline_common.S"
diff --git a/arch/x86/realmode/rm/trampoline_64.S b/arch/x86/realmode/rm/trampoline_64.S
index aee2b45d83b8..251758ed7443 100644
--- a/arch/x86/realmode/rm/trampoline_64.S
+++ b/arch/x86/realmode/rm/trampoline_64.S
@@ -38,7 +38,7 @@
 	.code16
 
 	.balign	PAGE_SIZE
-ENTRY(trampoline_start)
+SYM_CODE_START(trampoline_start)
 	cli			# We should be safe anyway
 	wbinvd
 
@@ -78,12 +78,14 @@ ENTRY(trampoline_start)
 no_longmode:
 	hlt
 	jmp no_longmode
+SYM_CODE_END(trampoline_start)
+
 #include "../kernel/verify_cpu.S"
 
 	.section ".text32","ax"
 	.code32
 	.balign 4
-ENTRY(startup_32)
+SYM_CODE_START(startup_32)
 	movl	%edx, %ss
 	addl	$pa_real_mode_base, %esp
 	movl	%edx, %ds
@@ -137,38 +139,39 @@ ENTRY(startup_32)
 	 * the new gdt/idt that has __KERNEL_CS with CS.L = 1.
 	 */
 	ljmpl	$__KERNEL_CS, $pa_startup_64
+SYM_CODE_END(startup_32)
 
 	.section ".text64","ax"
 	.code64
 	.balign 4
-ENTRY(startup_64)
+SYM_CODE_START(startup_64)
 	# Now jump into the kernel using virtual addresses
 	jmpq	*tr_start(%rip)
+SYM_CODE_END(startup_64)
 
 	.section ".rodata","a"
 	# Duplicate the global descriptor table
 	# so the kernel can live anywhere
 	.balign	16
-	.globl tr_gdt
-tr_gdt:
+SYM_DATA_START(tr_gdt)
 	.short	tr_gdt_end - tr_gdt - 1	# gdt limit
 	.long	pa_tr_gdt
 	.short	0
 	.quad	0x00cf9b000000ffff	# __KERNEL32_CS
 	.quad	0x00af9b000000ffff	# __KERNEL_CS
 	.quad	0x00cf93000000ffff	# __KERNEL_DS
-tr_gdt_end:
+SYM_DATA_END_LABEL(tr_gdt, SYM_L_LOCAL, tr_gdt_end)
 
 	.bss
 	.balign	PAGE_SIZE
-GLOBAL(trampoline_pgd)		.space	PAGE_SIZE
+SYM_DATA(trampoline_pgd, .space PAGE_SIZE)
 
 	.balign	8
-GLOBAL(trampoline_header)
-	tr_start:		.space	8
-	GLOBAL(tr_efer)		.space	8
-	GLOBAL(tr_cr4)		.space	4
-	GLOBAL(tr_flags)	.space	4
-END(trampoline_header)
+SYM_DATA_START(trampoline_header)
+	SYM_DATA_LOCAL(tr_start,	.space 8)
+	SYM_DATA(tr_efer,		.space 8)
+	SYM_DATA(tr_cr4,		.space 4)
+	SYM_DATA(tr_flags,		.space 4)
+SYM_DATA_END(trampoline_header)
 
 #include "trampoline_common.S"
diff --git a/arch/x86/realmode/rm/trampoline_common.S b/arch/x86/realmode/rm/trampoline_common.S
index 8d8208dcca24..5033e640f957 100644
--- a/arch/x86/realmode/rm/trampoline_common.S
+++ b/arch/x86/realmode/rm/trampoline_common.S
@@ -1,4 +1,4 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 	.section ".rodata","a"
 	.balign	16
-tr_idt: .fill 1, 6, 0
+SYM_DATA_LOCAL(tr_idt, .fill 1, 6, 0)
diff --git a/arch/x86/realmode/rm/wakeup_asm.S b/arch/x86/realmode/rm/wakeup_asm.S
index 05ac9c17c811..02d0ba16ae33 100644
--- a/arch/x86/realmode/rm/wakeup_asm.S
+++ b/arch/x86/realmode/rm/wakeup_asm.S
@@ -17,7 +17,7 @@
 	.section ".data", "aw"
 
 	.balign	16
-GLOBAL(wakeup_header)
+SYM_DATA_START(wakeup_header)
 	video_mode:	.short	0	/* Video mode number */
 	pmode_entry:	.long	0
 	pmode_cs:	.short	__KERNEL_CS
@@ -31,13 +31,13 @@ GLOBAL(wakeup_header)
 	realmode_flags:	.long	0
 	real_magic:	.long	0
 	signature:	.long	WAKEUP_HEADER_SIGNATURE
-END(wakeup_header)
+SYM_DATA_END(wakeup_header)
 
 	.text
 	.code16
 
 	.balign	16
-ENTRY(wakeup_start)
+SYM_CODE_START(wakeup_start)
 	cli
 	cld
 
@@ -73,7 +73,7 @@ ENTRY(wakeup_start)
 	movw	%ax, %fs
 	movw	%ax, %gs
 
-	lidtl	wakeup_idt
+	lidtl	.Lwakeup_idt
 
 	/* Clear the EFLAGS */
 	pushl $0
@@ -135,6 +135,7 @@ ENTRY(wakeup_start)
 #else
 	jmp	trampoline_start
 #endif
+SYM_CODE_END(wakeup_start)
 
 bogus_real_magic:
 1:
@@ -152,7 +153,7 @@ bogus_real_magic:
 	 */
 
 	.balign	16
-GLOBAL(wakeup_gdt)
+SYM_DATA_START(wakeup_gdt)
 	.word	3*8-1		/* Self-descriptor */
 	.long	pa_wakeup_gdt
 	.word	0
@@ -164,15 +165,15 @@ GLOBAL(wakeup_gdt)
 	.word	0xffff		/* 16-bit data segment @ real_mode_base */
 	.long	0x93000000 + pa_real_mode_base
 	.word	0x008f		/* big real mode */
-END(wakeup_gdt)
+SYM_DATA_END(wakeup_gdt)
 
 	.section ".rodata","a"
 	.balign	8
 
 	/* This is the standard real-mode IDT */
 	.balign	16
-GLOBAL(wakeup_idt)
+SYM_DATA_START_LOCAL(.Lwakeup_idt)
 	.word	0xffff		/* limit */
 	.long	0		/* address */
 	.word	0
-END(wakeup_idt)
+SYM_DATA_END(.Lwakeup_idt)
diff --git a/arch/x86/realmode/rmpiggy.S b/arch/x86/realmode/rmpiggy.S
index c078dba40cef..c8fef76743f6 100644
--- a/arch/x86/realmode/rmpiggy.S
+++ b/arch/x86/realmode/rmpiggy.S
@@ -10,12 +10,10 @@
 
 	.balign PAGE_SIZE
 
-GLOBAL(real_mode_blob)
+SYM_DATA_START(real_mode_blob)
 	.incbin	"arch/x86/realmode/rm/realmode.bin"
-END(real_mode_blob)
+SYM_DATA_END_LABEL(real_mode_blob, SYM_L_GLOBAL, real_mode_blob_end)
 
-GLOBAL(real_mode_blob_end);
-
-GLOBAL(real_mode_relocs)
+SYM_DATA_START(real_mode_relocs)
 	.incbin	"arch/x86/realmode/rm/realmode.relocs"
-END(real_mode_relocs)
+SYM_DATA_END(real_mode_relocs)