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thunk/restore functions are also used for tracing irqoff etc. and those are involved in kprobe's exception handling. Prohibit probing on them to avoid kernel crash. Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Reviewed-by: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/20140417081726.26341.3872.stgit@ltc230.yrl.intra.hitachi.co.jp Signed-off-by: Ingo Molnar <mingo@kernel.org>
30 lines
699 B
ArmAsm
30 lines
699 B
ArmAsm
/*
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* Trampoline to trace irqs off. (otherwise CALLER_ADDR1 might crash)
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* Copyright 2008 by Steven Rostedt, Red Hat, Inc
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* (inspired by Andi Kleen's thunk_64.S)
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* Subject to the GNU public license, v.2. No warranty of any kind.
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*/
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#include <linux/linkage.h>
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#include <asm/asm.h>
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#ifdef CONFIG_TRACE_IRQFLAGS
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/* put return address in eax (arg1) */
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.macro thunk_ra name,func
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.globl \name
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\name:
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pushl %eax
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pushl %ecx
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pushl %edx
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/* Place EIP in the arg1 */
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movl 3*4(%esp), %eax
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call \func
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popl %edx
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popl %ecx
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popl %eax
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ret
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_ASM_NOKPROBE(\name)
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.endm
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thunk_ra trace_hardirqs_on_thunk,trace_hardirqs_on_caller
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thunk_ra trace_hardirqs_off_thunk,trace_hardirqs_off_caller
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#endif
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