3b6c52b5b6
Impact: make ENTRY()/END() macros more capable
It's usefull to catch unbalanced or messed or mixed declarations of ENTRY and
KPROBES. These macros would help a bit.
For example the following code would compile without problems
ENTRY_X86(mcount)
retq
END_X86(mcount)
But if you forget and mess the following form
ENTRY_X86(mcount)
retq
END(mcount)
ENTRY_X86(ftrace_caller)
The assembler will issue the following message:
Error: ENTRY_X86/KPROBE_X86 unbalanced,missed,mixed
Actually the checking is performed at every _X86 macro
so maybe it's good idea to put ENTRY_KPROBE_FINAL_X86
at the end of .S file to be sure you didn't miss anything.
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Alexander van Heukelum <heukelum@mailshack.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
#ifndef _ASM_X86_LINKAGE_H
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#define _ASM_X86_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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/*
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* to check ENTRY_X86/END_X86 and
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* KPROBE_ENTRY_X86/KPROBE_END_X86
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* unbalanced-missed-mixed appearance
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*/
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#define __set_entry_x86 .set ENTRY_X86_IN, 0
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#define __unset_entry_x86 .set ENTRY_X86_IN, 1
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#define __set_kprobe_x86 .set KPROBE_X86_IN, 0
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#define __unset_kprobe_x86 .set KPROBE_X86_IN, 1
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#define __macro_err_x86 .error "ENTRY_X86/KPROBE_X86 unbalanced,missed,mixed"
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#define __check_entry_x86 \
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.ifdef ENTRY_X86_IN; \
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.ifeq ENTRY_X86_IN; \
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__macro_err_x86; \
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.abort; \
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.endif; \
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.endif
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#define __check_kprobe_x86 \
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.ifdef KPROBE_X86_IN; \
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.ifeq KPROBE_X86_IN; \
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__macro_err_x86; \
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.abort; \
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.endif; \
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.endif
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#define __check_entry_kprobe_x86 \
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__check_entry_x86; \
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__check_kprobe_x86
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#define ENTRY_KPROBE_FINAL_X86 __check_entry_kprobe_x86
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#define ENTRY_X86(name) \
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__check_entry_kprobe_x86; \
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__set_entry_x86; \
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.globl name; \
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__ALIGN; \
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name:
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#define END_X86(name) \
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__unset_entry_x86; \
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__check_entry_kprobe_x86; \
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.size name, .-name
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#define KPROBE_ENTRY_X86(name) \
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__check_entry_kprobe_x86; \
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__set_kprobe_x86; \
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.pushsection .kprobes.text, "ax"; \
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.globl name; \
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__ALIGN; \
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name:
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#define KPROBE_END_X86(name) \
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__unset_kprobe_x86; \
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__check_entry_kprobe_x86; \
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.size name, .-name; \
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.popsection
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#endif /* _ASM_X86_LINKAGE_H */
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