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x86/entry/32, x86/boot/32: Use local labels 

Add the local label prefix to all non-function named labels in head_32.S
and entry_32.S.  In addition to decluttering the symbol table, it also
will help stack traces to be more sensible.  For example, the last
reported function in the idle task stack trace will be startup_32_smp()
instead of is486().

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/14f9f7afd478b23a762f40734da1a57c0c273f6e.1474480779.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Josh Poimboeuf 2016-09-21 16:03:59 -05:00 committed by Ingo Molnar
parent 59df226831
commit 1b00255f32
2 changed files with 38 additions and 37 deletions
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43
arch/x86/entry/entry_32.S
View File

@ -307,13 +307,13 @@ END(ret_from_exception)
#ifdef CONFIG_PREEMPT
ENTRY(resume_kernel)
DISABLE_INTERRUPTS(CLBR_ANY)
need_resched:
.Lneed_resched:
cmpl $0, PER_CPU_VAR(__preempt_count)
jnz restore_all
testl $X86_EFLAGS_IF, PT_EFLAGS(%esp) # interrupts off (exception path) ?
jz restore_all
call preempt_schedule_irq
jmp need_resched
jmp .Lneed_resched
END(resume_kernel)
#endif
@ -334,7 +334,7 @@ GLOBAL(__begin_SYSENTER_singlestep_region)
*/
ENTRY(xen_sysenter_target)
addl $5*4, %esp /* remove xen-provided frame */
jmp sysenter_past_esp
jmp .Lsysenter_past_esp
#endif
/*
@ -371,7 +371,7 @@ ENTRY(xen_sysenter_target)
*/
ENTRY(entry_SYSENTER_32)
movl TSS_sysenter_sp0(%esp), %esp
sysenter_past_esp:
.Lsysenter_past_esp:
pushl $__USER_DS /* pt_regs->ss */
pushl %ebp /* pt_regs->sp (stashed in bp) */
pushfl /* pt_regs->flags (except IF = 0) */
@ -504,9 +504,9 @@ ENTRY(entry_INT80_32)
restore_all:
TRACE_IRQS_IRET
restore_all_notrace:
.Lrestore_all_notrace:
#ifdef CONFIG_X86_ESPFIX32
ALTERNATIVE "jmp restore_nocheck", "", X86_BUG_ESPFIX
ALTERNATIVE "jmp .Lrestore_nocheck", "", X86_BUG_ESPFIX
movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS
/*
@ -518,22 +518,23 @@ restore_all_notrace:
movb PT_CS(%esp), %al
andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax
cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax
je ldt_ss # returning to user-space with LDT SS
je .Lldt_ss # returning to user-space with LDT SS
#endif
restore_nocheck:
.Lrestore_nocheck:
RESTORE_REGS 4 # skip orig_eax/error_code
irq_return:
.Lirq_return:
INTERRUPT_RETURN
.section .fixup, "ax"
ENTRY(iret_exc )
pushl $0 # no error code
pushl $do_iret_error
jmp error_code
.previous
_ASM_EXTABLE(irq_return, iret_exc)
_ASM_EXTABLE(.Lirq_return, iret_exc)
#ifdef CONFIG_X86_ESPFIX32
ldt_ss:
.Lldt_ss:
/*
* Setup and switch to ESPFIX stack
*
@ -562,7 +563,7 @@ ldt_ss:
*/
DISABLE_INTERRUPTS(CLBR_EAX)
lss (%esp), %esp /* switch to espfix segment */
jmp restore_nocheck
jmp .Lrestore_nocheck
#endif
ENDPROC(entry_INT80_32)
@ -882,7 +883,7 @@ ftrace_call:
popl %edx
popl %ecx
popl %eax
ftrace_ret:
.Lftrace_ret:
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
.globl ftrace_graph_call
ftrace_graph_call:
@ -952,7 +953,7 @@ GLOBAL(ftrace_regs_call)
popl %gs
addl $8, %esp /* Skip orig_ax and ip */
popf /* Pop flags at end (no addl to corrupt flags) */
jmp ftrace_ret
jmp .Lftrace_ret
popf
jmp ftrace_stub
@ -963,7 +964,7 @@ ENTRY(mcount)
jb ftrace_stub /* Paging not enabled yet? */
cmpl $ftrace_stub, ftrace_trace_function
jnz trace
jnz .Ltrace
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
cmpl $ftrace_stub, ftrace_graph_return
jnz ftrace_graph_caller
@ -976,7 +977,7 @@ ftrace_stub:
ret
/* taken from glibc */
trace:
.Ltrace:
pushl %eax
pushl %ecx
pushl %edx
@ -1116,7 +1117,7 @@ ENTRY(nmi)
movl %ss, %eax
cmpw $__ESPFIX_SS, %ax
popl %eax
je nmi_espfix_stack
je .Lnmi_espfix_stack
#endif
pushl %eax # pt_regs->orig_ax
@ -1132,7 +1133,7 @@ ENTRY(nmi)
/* Not on SYSENTER stack. */
call do_nmi
jmp restore_all_notrace
jmp .Lrestore_all_notrace
.Lnmi_from_sysenter_stack:
/*
@ -1143,10 +1144,10 @@ ENTRY(nmi)
movl PER_CPU_VAR(cpu_current_top_of_stack), %esp
call do_nmi
movl %ebp, %esp
jmp restore_all_notrace
jmp .Lrestore_all_notrace
#ifdef CONFIG_X86_ESPFIX32
nmi_espfix_stack:
.Lnmi_espfix_stack:
/*
* create the pointer to lss back
*/
@ -1164,7 +1165,7 @@ nmi_espfix_stack:
call do_nmi
RESTORE_REGS
lss 12+4(%esp), %esp # back to espfix stack
jmp irq_return
jmp .Lirq_return
#endif
END(nmi)

32
arch/x86/kernel/head_32.S
View File

@ -248,19 +248,19 @@ page_pde_offset = (__PAGE_OFFSET >> 20);
#ifdef CONFIG_PARAVIRT
/* This is can only trip for a broken bootloader... */
cmpw $0x207, pa(boot_params + BP_version)
jb default_entry
jb .Ldefault_entry
/* Paravirt-compatible boot parameters. Look to see what architecture
we're booting under. */
movl pa(boot_params + BP_hardware_subarch), %eax
cmpl $num_subarch_entries, %eax
jae bad_subarch
jae .Lbad_subarch
movl pa(subarch_entries)(,%eax,4), %eax
subl $__PAGE_OFFSET, %eax
jmp *%eax
bad_subarch:
.Lbad_subarch:
WEAK(lguest_entry)
WEAK(xen_entry)
/* Unknown implementation; there's really
@ -270,14 +270,14 @@ WEAK(xen_entry)
__INITDATA
subarch_entries:
.long default_entry /* normal x86/PC */
.long .Ldefault_entry /* normal x86/PC */
.long lguest_entry /* lguest hypervisor */
.long xen_entry /* Xen hypervisor */
.long default_entry /* Moorestown MID */
.long .Ldefault_entry /* Moorestown MID */
num_subarch_entries = (. - subarch_entries) / 4
.previous
#else
jmp default_entry
jmp .Ldefault_entry
#endif /* CONFIG_PARAVIRT */
#ifdef CONFIG_HOTPLUG_CPU
@ -317,7 +317,7 @@ ENTRY(startup_32_smp)
call load_ucode_ap
#endif
default_entry:
.Ldefault_entry:
#define CR0_STATE (X86_CR0_PE | X86_CR0_MP | X86_CR0_ET | \
X86_CR0_NE | X86_CR0_WP | X86_CR0_AM | \
X86_CR0_PG)
@ -347,7 +347,7 @@ default_entry:
pushfl
popl %eax # get EFLAGS
testl $X86_EFLAGS_ID,%eax # did EFLAGS.ID remained set?
jz enable_paging # hw disallowed setting of ID bit
jz .Lenable_paging # hw disallowed setting of ID bit
# which means no CPUID and no CR4
xorl %eax,%eax
@ -357,13 +357,13 @@ default_entry:
movl $1,%eax
cpuid
andl $~1,%edx # Ignore CPUID.FPU
jz enable_paging # No flags or only CPUID.FPU = no CR4
jz .Lenable_paging # No flags or only CPUID.FPU = no CR4
movl pa(mmu_cr4_features),%eax
movl %eax,%cr4
testb $X86_CR4_PAE, %al # check if PAE is enabled
jz enable_paging
jz .Lenable_paging
/* Check if extended functions are implemented */
movl $0x80000000, %eax
@ -371,7 +371,7 @@ default_entry:
/* Value must be in the range 0x80000001 to 0x8000ffff */
subl $0x80000001, %eax
cmpl $(0x8000ffff-0x80000001), %eax
ja enable_paging
ja .Lenable_paging
/* Clear bogus XD_DISABLE bits */
call verify_cpu
@ -380,7 +380,7 @@ default_entry:
cpuid
/* Execute Disable bit supported? */
btl $(X86_FEATURE_NX & 31), %edx
jnc enable_paging
jnc .Lenable_paging
/* Setup EFER (Extended Feature Enable Register) */
movl $MSR_EFER, %ecx
@ -390,7 +390,7 @@ default_entry:
/* Make changes effective */
wrmsr
enable_paging:
.Lenable_paging:
/*
* Enable paging
@ -419,7 +419,7 @@ enable_paging:
*/
movb $4,X86 # at least 486
cmpl $-1,X86_CPUID
je is486
je .Lis486
/* get vendor info */
xorl %eax,%eax # call CPUID with 0 -> return vendor ID
@ -430,7 +430,7 @@ enable_paging:
movl %ecx,X86_VENDOR_ID+8 # last 4 chars
orl %eax,%eax # do we have processor info as well?
je is486
je .Lis486
movl $1,%eax # Use the CPUID instruction to get CPU type
cpuid
@ -444,7 +444,7 @@ enable_paging:
movb %cl,X86_MASK
movl %edx,X86_CAPABILITY
is486:
.Lis486:
movl $0x50022,%ecx # set AM, WP, NE and MP
movl %cr0,%eax
andl $0x80000011,%eax # Save PG,PE,ET