diff options
Diffstat (limited to 'kernel/arch/x86/lib/thunk_32.S')
| -rw-r--r-- | kernel/arch/x86/lib/thunk_32.S | 45 |
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 + |