| Andi Kleen | cc1e684 | 2006-09-26 10:52:29 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Save registers before calling assembly functions. This avoids |
| 3 | * disturbance of register allocation in some inline assembly constructs. |
| 4 | * Copyright 2001,2002 by Andi Kleen, SuSE Labs. |
| Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 5 | * Added trace_hardirqs callers - Copyright 2007 Steven Rostedt, Red Hat, Inc. |
| Andi Kleen | cc1e684 | 2006-09-26 10:52:29 +0200 | [diff] [blame] | 6 | * Subject to the GNU public license, v.2. No warranty of any kind. |
| 7 | */ |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/linkage.h> |
| 10 | #include <asm/dwarf2.h> |
| 11 | #include <asm/calling.h> |
| 12 | #include <asm/rwlock.h> |
| 13 | |
| 14 | /* rdi: arg1 ... normal C conventions. rax is saved/restored. */ |
| 15 | .macro thunk name,func |
| 16 | .globl \name |
| 17 | \name: |
| 18 | CFI_STARTPROC |
| 19 | SAVE_ARGS |
| 20 | call \func |
| 21 | jmp restore |
| 22 | CFI_ENDPROC |
| 23 | .endm |
| 24 | |
| Ingo Molnar | 6375e2b | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 25 | #ifdef CONFIG_TRACE_IRQFLAGS |
| Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 26 | /* put return address in rdi (arg1) */ |
| 27 | .macro thunk_ra name,func |
| 28 | .globl \name |
| 29 | \name: |
| 30 | CFI_STARTPROC |
| 31 | SAVE_ARGS |
| 32 | /* SAVE_ARGS pushs 9 elements */ |
| 33 | /* the next element would be the rip */ |
| 34 | movq 9*8(%rsp), %rdi |
| 35 | call \func |
| 36 | jmp restore |
| 37 | CFI_ENDPROC |
| 38 | .endm |
| 39 | |
| 40 | thunk_ra trace_hardirqs_on_thunk,trace_hardirqs_on_caller |
| 41 | thunk_ra trace_hardirqs_off_thunk,trace_hardirqs_off_caller |
| Ingo Molnar | 6375e2b | 2006-07-03 00:24:45 -0700 | [diff] [blame] | 42 | #endif |
| Peter Zijlstra | 10cd706 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 43 | |
| 44 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 45 | thunk lockdep_sys_exit_thunk,lockdep_sys_exit |
| 46 | #endif |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | /* SAVE_ARGS below is used only for the .cfi directives it contains. */ |
| 49 | CFI_STARTPROC |
| 50 | SAVE_ARGS |
| 51 | restore: |
| 52 | RESTORE_ARGS |
| 53 | ret |
| 54 | CFI_ENDPROC |