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Commit b8b1d08b authored by Alexander van Heukelum's avatar Alexander van Heukelum Committed by Ingo Molnar
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x86: entry_64.S: split out some macro's and move common code to paranoid_exit 



Impact: cleanup

DISABLE_INTERRUPTS(CLBR_NONE)/TRACE_IRQS_OFF is now always
executed just before paranoid_exit. Move it there.

Split out paranoidzeroentry, paranoiderrorentry, and
paranoidzeroentry_ist to get more readable macro's.

Signed-off-by: default avatarAlexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e2f6bc25

arch/x86/kernel/entry_64.S

+51 −51
Original line number Diff line number Diff line
@@ -1026,6 +1026,39 @@ END(spurious_interrupt) 
	CFI_ENDPROC

	.endm



	.macro paranoidzeroentry sym

	INTR_FRAME

	PARAVIRT_ADJUST_EXCEPTION_FRAME

	pushq $-1		/* ORIG_RAX: no syscall to restart */

	CFI_ADJUST_CFA_OFFSET 8

	subq $15*8, %rsp

	call save_paranoid

	TRACE_IRQS_OFF

	movq %rsp,%rdi		/* pt_regs pointer */

	xorl %esi,%esi		/* no error code */

	call \sym

	jmp paranoid_exit	/* %ebx: no swapgs flag */

	CFI_ENDPROC

	.endm



	.macro paranoidzeroentry_ist sym ist

 	INTR_FRAME

	PARAVIRT_ADJUST_EXCEPTION_FRAME

	pushq $-1		/* ORIG_RAX: no syscall to restart */

	CFI_ADJUST_CFA_OFFSET 8

	subq $15*8, %rsp

	call save_paranoid

	TRACE_IRQS_OFF

	movq %rsp,%rdi		/* pt_regs pointer */

	xorl %esi,%esi		/* no error code */

	movq %gs:pda_data_offset, %rbp

	subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)

	call \sym

	addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)

	jmp paranoid_exit	/* %ebx: no swapgs flag */

	CFI_ENDPROC

	.endm



	.macro errorentry sym

	XCPT_FRAME

	PARAVIRT_ADJUST_EXCEPTION_FRAME
@@ -1042,27 +1075,20 @@ END(spurious_interrupt) 
	.endm



	/* error code is on the stack already */

	.macro paranoidentry sym ist=0

	.macro paranoiderrorentry sym

	XCPT_FRAME

	PARAVIRT_ADJUST_EXCEPTION_FRAME

	subq $15*8,%rsp

	CFI_ADJUST_CFA_OFFSET 15*8

	call save_paranoid

	DEFAULT_FRAME 0

	.if \ist

	movq	%gs:pda_data_offset, %rbp

	.endif

	TRACE_IRQS_OFF

	movq %rsp,%rdi

	movq ORIG_RAX(%rsp),%rsi

	movq $-1,ORIG_RAX(%rsp)

	.if \ist

	subq	$EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)

	.endif

	movq %rsp,%rdi			/* pt_regs pointer */

	movq ORIG_RAX(%rsp),%rsi	/* get error code */

	movq $-1,ORIG_RAX(%rsp)		/* no syscall to restart */

	call \sym

	.if \ist

	addq	$EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)

	.endif

	DISABLE_INTERRUPTS(CLBR_NONE)

	TRACE_IRQS_OFF

	jmp paranoid_exit		/* %ebx: no swapgs flag */

	CFI_ENDPROC

	.endm



	/*
@@ -1081,6 +1107,8 @@ END(spurious_interrupt) 
	/* ebx:	no swapgs flag */

KPROBE_ENTRY(paranoid_exit)

	INTR_FRAME

	DISABLE_INTERRUPTS(CLBR_NONE)

	TRACE_IRQS_OFF

	testl %ebx,%ebx				/* swapgs needed? */

	jnz paranoid_restore

	testl $3,CS(%rsp)
@@ -1331,13 +1359,7 @@ END(device_not_available) 


	/* runs on exception stack */

KPROBE_ENTRY(debug)

 	INTR_FRAME

	PARAVIRT_ADJUST_EXCEPTION_FRAME

	pushq $0

	CFI_ADJUST_CFA_OFFSET 8

	paranoidentry do_debug, DEBUG_STACK

	jmp paranoid_exit

 	CFI_ENDPROC

	paranoidzeroentry_ist do_debug, DEBUG_STACK

KPROBE_END(debug)



	/* runs on exception stack */
@@ -1351,14 +1373,12 @@ KPROBE_ENTRY(nmi) 
	DEFAULT_FRAME 0

	/* paranoidentry do_nmi, 0; without TRACE_IRQS_OFF */

	movq %rsp,%rdi

	movq ORIG_RAX(%rsp),%rsi

	movq $-1,ORIG_RAX(%rsp)

	movq $-1,%rsi

	call do_nmi

	DISABLE_INTERRUPTS(CLBR_NONE)

#ifdef CONFIG_TRACE_IRQFLAGS

	/* paranoidexit; without TRACE_IRQS_OFF */

	/* ebx:	no swapgs flag */

nmi_exit:

	DISABLE_INTERRUPTS(CLBR_NONE)

	testl %ebx,%ebx				/* swapgs needed? */

	jnz nmi_restore

	testl $3,CS(%rsp)
@@ -1398,13 +1418,7 @@ nmi_schedule: 
KPROBE_END(nmi)



KPROBE_ENTRY(int3)

 	INTR_FRAME

	PARAVIRT_ADJUST_EXCEPTION_FRAME

 	pushq $0

 	CFI_ADJUST_CFA_OFFSET 8

 	paranoidentry do_int3, DEBUG_STACK

 	jmp paranoid_exit

 	CFI_ENDPROC

	paranoidzeroentry_ist do_int3, DEBUG_STACK

KPROBE_END(int3)



ENTRY(overflow)
@@ -1425,11 +1439,7 @@ END(coprocessor_segment_overrun) 


	/* runs on exception stack */

ENTRY(double_fault)

	XCPT_FRAME

	PARAVIRT_ADJUST_EXCEPTION_FRAME

	paranoidentry do_double_fault

	jmp paranoid_exit

	CFI_ENDPROC

	paranoiderrorentry do_double_fault

END(double_fault)



ENTRY(invalid_TSS)
@@ -1442,11 +1452,7 @@ END(segment_not_present) 


	/* runs on exception stack */

ENTRY(stack_segment)

	XCPT_FRAME

	PARAVIRT_ADJUST_EXCEPTION_FRAME

	paranoidentry do_stack_segment

	jmp paranoid_exit

	CFI_ENDPROC

	paranoiderrorentry do_stack_segment

END(stack_segment)



KPROBE_ENTRY(general_protection)
@@ -1468,13 +1474,7 @@ END(spurious_interrupt_bug) 
#ifdef CONFIG_X86_MCE

	/* runs on exception stack */

ENTRY(machine_check)

	INTR_FRAME

	PARAVIRT_ADJUST_EXCEPTION_FRAME

	pushq $0

	CFI_ADJUST_CFA_OFFSET 8

	paranoidentry do_machine_check

	jmp paranoid_exit

	CFI_ENDPROC

	paranoidzeroentry do_machine_check

END(machine_check)

#endif