From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- arch/x86/lib/thunk_64.S | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 arch/x86/lib/thunk_64.S (limited to 'arch/x86/lib/thunk_64.S') diff --git a/arch/x86/lib/thunk_64.S b/arch/x86/lib/thunk_64.S new file mode 100644 index 00000000..a63efd6b --- /dev/null +++ b/arch/x86/lib/thunk_64.S @@ -0,0 +1,45 @@ +/* + * 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 +#include +#include + + /* rdi: arg1 ... normal C conventions. rax is saved/restored. */ + .macro THUNK name, func, put_ret_addr_in_rdi=0 + .globl \name +\name: + CFI_STARTPROC + + /* this one pushes 9 elems, the next one would be %rIP */ + SAVE_ARGS + + .if \put_ret_addr_in_rdi + movq_cfi_restore 9*8, rdi + .endif + + call \func + jmp restore + CFI_ENDPROC + .endm + +#ifdef CONFIG_TRACE_IRQFLAGS + THUNK trace_hardirqs_on_thunk,trace_hardirqs_on_caller,1 + THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1 +#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 -- cgit v1.3.1