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ARM: 6318/1: ftrace: fix and update dynamic ftrace

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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>
This commit is contained in:
Rabin Vincent
2010-08-10 19:43:28 +01:00
committed by Russell King
parent f9810a8253
commit 3b6c223b1b
4 changed files with 155 additions and 58 deletions
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19
arch/arm/include/asm/ftrace.h
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@ -2,12 +2,29 @@
#define _ASM_ARM_FTRACE
#ifdef CONFIG_FUNCTION_TRACER
#define MCOUNT_ADDR ((long)(mcount))
#define MCOUNT_ADDR ((unsigned long)(__gnu_mcount_nc))
#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
#ifndef __ASSEMBLY__
extern void mcount(void);
extern void __gnu_mcount_nc(void);
#ifdef CONFIG_DYNAMIC_FTRACE
struct dyn_arch_ftrace {
#ifdef CONFIG_OLD_MCOUNT
bool old_mcount;
#endif
};
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
return addr;
}
extern void ftrace_caller_old(void);
extern void ftrace_call_old(void);
#endif
#endif
#endif