diff options
Diffstat (limited to 'arch/x86/lib/thunk_64.S')
| -rw-r--r-- | arch/x86/lib/thunk_64.S | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/x86/lib/thunk_64.S b/arch/x86/lib/thunk_64.S new file mode 100644 index 00000000..782b082c --- /dev/null +++ b/arch/x86/lib/thunk_64.S @@ -0,0 +1,54 @@ +/* + * Save registers before calling assembly functions. This avoids + * disturbance of register allocation in some inline assembly constructs. + * Copyright 2001,2002 by Andi Kleen, SuSE Labs. + * Added trace_hardirqs callers - Copyright 2007 Steven Rostedt, Red Hat, Inc. + * Subject to the GNU public license, v.2. No warranty of any kind. + */ + + #include <linux/linkage.h> + #include <asm/dwarf2.h> + #include <asm/calling.h> + #include <asm/rwlock.h> + + /* rdi: arg1 ... normal C conventions. rax is saved/restored. */ + .macro thunk name,func + .globl \name +\name: + CFI_STARTPROC + SAVE_ARGS + call \func + jmp restore + CFI_ENDPROC + .endm + +#ifdef CONFIG_TRACE_IRQFLAGS + /* put return address in rdi (arg1) */ + .macro thunk_ra name,func + .globl \name +\name: + CFI_STARTPROC + SAVE_ARGS + /* SAVE_ARGS pushs 9 elements */ + /* the next element would be the rip */ + movq 9*8(%rsp), %rdi + call \func + jmp restore + CFI_ENDPROC + .endm + + thunk_ra trace_hardirqs_on_thunk,trace_hardirqs_on_caller + thunk_ra trace_hardirqs_off_thunk,trace_hardirqs_off_caller +#endif + +#ifdef CONFIG_DEBUG_LOCK_ALLOC + thunk lockdep_sys_exit_thunk,lockdep_sys_exit +#endif + + /* SAVE_ARGS below is used only for the .cfi directives it contains. */ + CFI_STARTPROC + SAVE_ARGS +restore: + RESTORE_ARGS + ret + CFI_ENDPROC |