summaryrefslogtreecommitdiffstats
path: root/arch/x86/lib/thunk_64.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/lib/thunk_64.S')
-rw-r--r--arch/x86/lib/thunk_64.S67
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/x86/lib/thunk_64.S b/arch/x86/lib/thunk_64.S
new file mode 100644
index 000000000000..55e586d352d3
--- /dev/null
+++ b/arch/x86/lib/thunk_64.S
@@ -0,0 +1,67 @@
+/*
+ * 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.
+ * 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
+
+ /* rdi: arg1 ... normal C conventions. rax is passed from C. */
+ .macro thunk_retrax name,func
+ .globl \name
+\name:
+ CFI_STARTPROC
+ SAVE_ARGS
+ call \func
+ jmp restore_norax
+ CFI_ENDPROC
+ .endm
+
+
+ .section .sched.text
+#ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
+ thunk rwsem_down_read_failed_thunk,rwsem_down_read_failed
+ thunk rwsem_down_write_failed_thunk,rwsem_down_write_failed
+ thunk rwsem_wake_thunk,rwsem_wake
+ thunk rwsem_downgrade_thunk,rwsem_downgrade_wake
+#endif
+
+ thunk __down_failed,__down
+ thunk_retrax __down_failed_interruptible,__down_interruptible
+ thunk_retrax __down_failed_trylock,__down_trylock
+ thunk __up_wakeup,__up
+
+#ifdef CONFIG_TRACE_IRQFLAGS
+ thunk trace_hardirqs_on_thunk,trace_hardirqs_on
+ thunk trace_hardirqs_off_thunk,trace_hardirqs_off
+#endif
+
+ /* SAVE_ARGS below is used only for the .cfi directives it contains. */
+ CFI_STARTPROC
+ SAVE_ARGS
+restore:
+ RESTORE_ARGS
+ ret
+ CFI_ENDPROC
+
+ CFI_STARTPROC
+ SAVE_ARGS
+restore_norax:
+ RESTORE_ARGS 1
+ ret
+ CFI_ENDPROC