ac4fac8cb2
This splits out the unwinder implementation and adds a new return_address() abstraction modelled after the ARM code. The DWARF unwinder is tied in to this, returning NULL otherwise in the case of being unable to support arbitrary depths. This enables us to get correct behaviour with the unwinder enabled, as well as disabling the arbitrary depth support when frame pointers are enabled, as arbitrary depths with __builtin_return_address() are not supported regardless. With this abstraction it's also possible to layer on a simplified implementation with frame pointers in the event that the unwinder isn't enabled, although this is left as a future exercise. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
#ifndef __ASM_SH_FTRACE_H
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#define __ASM_SH_FTRACE_H
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#ifdef CONFIG_FUNCTION_TRACER
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#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
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#define FTRACE_SYSCALL_MAX NR_syscalls
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#ifndef __ASSEMBLY__
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extern void mcount(void);
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#define MCOUNT_ADDR ((long)(mcount))
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#ifdef CONFIG_DYNAMIC_FTRACE
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#define CALL_ADDR ((long)(ftrace_call))
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#define STUB_ADDR ((long)(ftrace_stub))
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#define GRAPH_ADDR ((long)(ftrace_graph_call))
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#define CALLER_ADDR ((long)(ftrace_caller))
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#define MCOUNT_INSN_OFFSET ((STUB_ADDR - CALL_ADDR) - 4)
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#define GRAPH_INSN_OFFSET ((CALLER_ADDR - GRAPH_ADDR) - 4)
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struct dyn_arch_ftrace {
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/* No extra data needed on sh */
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};
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#endif /* CONFIG_DYNAMIC_FTRACE */
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static inline unsigned long ftrace_call_adjust(unsigned long addr)
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{
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/* 'addr' is the memory table address. */
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return addr;
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}
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/* arch/sh/kernel/return_address.c */
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extern void *return_address(unsigned int);
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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 /* __ASSEMBLY__ */
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#endif /* CONFIG_FUNCTION_TRACER */
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#endif /* __ASM_SH_FTRACE_H */
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