forked from Minki/linux
3b6c223b1b
This adds mcount recording and updates dynamic ftrace for ARM to work with the new ftrace dyamic tracing implementation. It also adds support for the mcount format used by newer ARM compilers. With dynamic tracing, mcount() is implemented as a nop. Callsites are patched on startup with nops, and dynamically patched to call to the ftrace_caller() routine as needed. Acked-by: Steven Rostedt <rostedt@goodmis.org> [recordmcount.pl change] Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
#ifndef _ASM_ARM_FTRACE
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#define _ASM_ARM_FTRACE
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#ifdef CONFIG_FUNCTION_TRACER
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#define MCOUNT_ADDR ((unsigned long)(__gnu_mcount_nc))
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#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
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#ifndef __ASSEMBLY__
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extern void mcount(void);
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extern void __gnu_mcount_nc(void);
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#ifdef CONFIG_DYNAMIC_FTRACE
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struct dyn_arch_ftrace {
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#ifdef CONFIG_OLD_MCOUNT
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bool old_mcount;
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#endif
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};
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static inline unsigned long ftrace_call_adjust(unsigned long addr)
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{
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return addr;
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}
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extern void ftrace_caller_old(void);
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extern void ftrace_call_old(void);
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#endif
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#endif
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#endif
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#ifndef __ASSEMBLY__
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#if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
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/*
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* return_address uses walk_stackframe to do it's work. If both
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* CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
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* information. For this to work in the function tracer many functions would
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* have to be marked with __notrace. So for now just depend on
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* !CONFIG_ARM_UNWIND.
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*/
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void *return_address(unsigned int);
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#else
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extern inline void *return_address(unsigned int level)
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{
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return NULL;
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}
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#endif
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#define HAVE_ARCH_CALLER_ADDR
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#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
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#define CALLER_ADDR1 ((unsigned long)return_address(1))
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#define CALLER_ADDR2 ((unsigned long)return_address(2))
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#define CALLER_ADDR3 ((unsigned long)return_address(3))
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#define CALLER_ADDR4 ((unsigned long)return_address(4))
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#define CALLER_ADDR5 ((unsigned long)return_address(5))
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#define CALLER_ADDR6 ((unsigned long)return_address(6))
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#endif /* ifndef __ASSEMBLY__ */
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#endif /* _ASM_ARM_FTRACE */
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