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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/x86/lib/thunk_64.S
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/*

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 * Save registers before calling assembly functions. This avoids

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 * disturbance of register allocation in some inline assembly constructs.

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 * Copyright 2001,2002 by Andi Kleen, SuSE Labs.

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 * Added trace_hardirqs callers - Copyright 2007 Steven Rostedt, Red Hat, Inc.

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 * Subject to the GNU public license, v.2. No warranty of any kind.

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 */

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	#include <linux/linkage.h>

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	#include <asm/dwarf2.h>

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	#include <asm/calling.h>			

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	#include <asm/rwlock.h>

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	/* rdi:	arg1 ... normal C conventions. rax is saved/restored. */ 	

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	.macro thunk name,func

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	.globl \name

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\name:	

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	CFI_STARTPROC

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	SAVE_ARGS

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	call \func

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	jmp  restore

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	CFI_ENDPROC

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	.endm

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#ifdef CONFIG_TRACE_IRQFLAGS

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	/* put return address in rdi (arg1) */

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	.macro thunk_ra name,func

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	.globl \name

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\name:

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	CFI_STARTPROC

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	SAVE_ARGS

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	/* SAVE_ARGS pushs 9 elements */

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	/* the next element would be the rip */

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	movq 9*8(%rsp), %rdi

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	call \func

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	jmp  restore

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	CFI_ENDPROC

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	.endm

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	thunk_ra trace_hardirqs_on_thunk,trace_hardirqs_on_caller

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	thunk_ra trace_hardirqs_off_thunk,trace_hardirqs_off_caller

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#endif

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#ifdef CONFIG_DEBUG_LOCK_ALLOC

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	thunk lockdep_sys_exit_thunk,lockdep_sys_exit

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#endif

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	/* SAVE_ARGS below is used only for the .cfi directives it contains. */

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	CFI_STARTPROC

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	SAVE_ARGS

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restore:

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	RESTORE_ARGS

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	ret	

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	CFI_ENDPROC

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