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sh: tracing: Use the DWARF unwinder for CALLER_ADDRx

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The major reason for implementing the DWARF unwinder in the first place
was so that we could stop using __builtin_return_address(n), which
doesn't work on SH for n > 0.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
This commit is contained in:
Matt Fleming 2009-10-11 17:56:17 +01:00
parent 5e3679c594
commit d26cddbbd2
1 changed files with 47 additions and 0 deletions
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47
arch/sh/include/asm/ftrace.h
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@ -32,6 +32,53 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
return addr;
}
#ifdef CONFIG_DWARF_UNWINDER
#include <asm/dwarf.h>
#define HAVE_ARCH_CALLER_ADDR
static inline unsigned long dwarf_return_address(int depth)
{
struct dwarf_frame *frame;
unsigned long ra;
int i;
for (i = 0, frame = NULL, ra = 0; i <= depth; i++) {
struct dwarf_frame *tmp;
tmp = dwarf_unwind_stack(ra, frame);
if (frame)
dwarf_free_frame(frame);
frame = tmp;
if (!frame || !frame->return_addr)
break;
ra = frame->return_addr;
}
/* Failed to unwind the stack to the specified depth. */
WARN_ON(i != depth + 1);
if (frame)
dwarf_free_frame(frame);
return ra;
}
#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
#define CALLER_ADDR1 dwarf_return_address(1)
#define CALLER_ADDR2 dwarf_return_address(2)
#define CALLER_ADDR3 dwarf_return_address(3)
#define CALLER_ADDR4 dwarf_return_address(4)
#define CALLER_ADDR5 dwarf_return_address(5)
#define CALLER_ADDR6 dwarf_return_address(6)
#endif /* CONFIG_DWARF_UNWINDER */
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_FUNCTION_TRACER */