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ftrace: Make CALLER_ADDRx macros more generic

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Most archs with HAVE_ARCH_CALLER_ADDR have pretty much the same
definitions of CALLER_ADDRx(n). Instead of duplicating the code for all
the archs, define a ftrace_return_address0() and
ftrace_return_address(n) that can be overwritten by the archs if they
need to do something different. Instead of 7 macros in every arch, we
now only have at most 2 (and actually only 1 as
ftrace_return_address0() should be the same for all archs).

The CALLER_ADDRx(n) will now be defined in linux/ftrace.h and use the
ftrace_return_address*(n?) macros. This removes a lot of the duplicate
code.

Link: http://lkml.kernel.org/p/[email protected]

Signed-off-by: AKASHI Takahiro <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
This commit is contained in:
AKASHI Takahiro 2014-05-20 20:31:04 +09:00 • committed by Steven Rostedt
commit eed542d696
6 changed files with 26 additions and 63 deletions
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14
arch/xtensa/include/asm/ftrace.h
View file

@ -12,24 +12,18 @@
#include <asm/processor.h>
#define HAVE_ARCH_CALLER_ADDR
#ifndef __ASSEMBLY__
#define CALLER_ADDR0 ({ unsigned long a0, a1; \
#define ftrace_return_address0 ({ unsigned long a0, a1; \
__asm__ __volatile__ ( \
"mov %0, a0\n" \
"mov %1, a1\n" \
: "=r"(a0), "=r"(a1)); \
MAKE_PC_FROM_RA(a0, a1); })
#ifdef CONFIG_FRAME_POINTER
extern unsigned long return_address(unsigned level);
#define CALLER_ADDR1 return_address(1)
#define CALLER_ADDR2 return_address(2)
#define CALLER_ADDR3 return_address(3)
#else /* CONFIG_FRAME_POINTER */
#define CALLER_ADDR1 (0)
#define CALLER_ADDR2 (0)
#define CALLER_ADDR3 (0)
#endif /* CONFIG_FRAME_POINTER */
#define ftrace_return_address(n) return_address(n)
#endif
#endif /* __ASSEMBLY__ */
#ifdef CONFIG_FUNCTION_TRACER