78a9909aab
notrace signals that a function should not be traced. Most of the time this is used by tracers to annotate code that cannot be traced - it's in a volatile state (such as in user vdso context or NMI context) or it's in the tracer internals. Signed-off-by: Ingo Molnar <mingo@elte.hu>
61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
#ifndef __ASM_LINKAGE_H
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#define __ASM_LINKAGE_H
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#undef notrace
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#define notrace __attribute__((no_instrument_function))
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#ifdef CONFIG_X86_64
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#define __ALIGN .p2align 4,,15
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#define __ALIGN_STR ".p2align 4,,15"
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#endif
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#ifdef CONFIG_X86_32
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#define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
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/*
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* For 32-bit UML - mark functions implemented in assembly that use
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* regparm input parameters:
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*/
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#define asmregparm __attribute__((regparm(3)))
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/*
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* Make sure the compiler doesn't do anything stupid with the
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* arguments on the stack - they are owned by the *caller*, not
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* the callee. This just fools gcc into not spilling into them,
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* and keeps it from doing tailcall recursion and/or using the
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* stack slots for temporaries, since they are live and "used"
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* all the way to the end of the function.
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*
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* NOTE! On x86-64, all the arguments are in registers, so this
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* only matters on a 32-bit kernel.
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*/
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#define asmlinkage_protect(n, ret, args...) \
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__asmlinkage_protect##n(ret, ##args)
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#define __asmlinkage_protect_n(ret, args...) \
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__asm__ __volatile__ ("" : "=r" (ret) : "0" (ret), ##args)
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#define __asmlinkage_protect0(ret) \
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__asmlinkage_protect_n(ret)
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#define __asmlinkage_protect1(ret, arg1) \
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__asmlinkage_protect_n(ret, "g" (arg1))
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#define __asmlinkage_protect2(ret, arg1, arg2) \
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__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2))
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#define __asmlinkage_protect3(ret, arg1, arg2, arg3) \
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__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3))
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#define __asmlinkage_protect4(ret, arg1, arg2, arg3, arg4) \
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__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
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"g" (arg4))
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#define __asmlinkage_protect5(ret, arg1, arg2, arg3, arg4, arg5) \
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__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
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"g" (arg4), "g" (arg5))
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#define __asmlinkage_protect6(ret, arg1, arg2, arg3, arg4, arg5, arg6) \
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__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
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"g" (arg4), "g" (arg5), "g" (arg6))
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#endif
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#ifdef CONFIG_X86_ALIGNMENT_16
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#define __ALIGN .align 16,0x90
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#define __ALIGN_STR ".align 16,0x90"
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#endif
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#endif
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