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-rw-r--r--kernel/arch/x86/lib/thunk_32.S45
1 files changed, 45 insertions, 0 deletions
diff --git a/kernel/arch/x86/lib/thunk_32.S b/kernel/arch/x86/lib/thunk_32.S
new file mode 100644
index 000000000..5eb715087
--- /dev/null
+++ b/kernel/arch/x86/lib/thunk_32.S
@@ -0,0 +1,45 @@
+/*
+ * Trampoline to trace irqs off. (otherwise CALLER_ADDR1 might crash)
+ * Copyright 2008 by Steven Rostedt, Red Hat, Inc
+ * (inspired by Andi Kleen's thunk_64.S)
+ * Subject to the GNU public license, v.2. No warranty of any kind.
+ */
+ #include <linux/linkage.h>
+ #include <asm/asm.h>
+ #include <asm/dwarf2.h>
+
+ /* put return address in eax (arg1) */
+ .macro THUNK name, func, put_ret_addr_in_eax=0
+ .globl \name
+\name:
+ CFI_STARTPROC
+ pushl_cfi_reg eax
+ pushl_cfi_reg ecx
+ pushl_cfi_reg edx
+
+ .if \put_ret_addr_in_eax
+ /* Place EIP in the arg1 */
+ movl 3*4(%esp), %eax
+ .endif
+
+ call \func
+ popl_cfi_reg edx
+ popl_cfi_reg ecx
+ popl_cfi_reg eax
+ ret
+ CFI_ENDPROC
+ _ASM_NOKPROBE(\name)
+ .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_PREEMPT
+ THUNK ___preempt_schedule, preempt_schedule
+#ifdef CONFIG_CONTEXT_TRACKING
+ THUNK ___preempt_schedule_context, preempt_schedule_context
+#endif
+#endif
+