powerpc32, ftrace: port function graph tracer to ppc32, static only
This patch ports the function graph tracer for PowerPC, but only for static function tracing. Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -111,7 +111,7 @@ config PPC
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select HAVE_FTRACE_MCOUNT_RECORD
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select HAVE_DYNAMIC_FTRACE
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select HAVE_FUNCTION_TRACER
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select HAVE_FUNCTION_GRAPH_TRACER if PPC64
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select HAVE_FUNCTION_GRAPH_TRACER if PPC64 || !DYNAMIC_FTRACE
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select ARCH_WANT_OPTIONAL_GPIOLIB
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select HAVE_IDE
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select HAVE_IOREMAP_PROT
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@ -1199,9 +1199,11 @@ _GLOBAL(_mcount)
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mtctr r5
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bctrl
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nop
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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b ftrace_graph_caller
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#endif
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MCOUNT_RESTORE_FRAME
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bctr
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@ -1210,4 +1212,43 @@ _GLOBAL(_mcount)
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_GLOBAL(ftrace_stub)
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blr
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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_GLOBAL(ftrace_graph_caller)
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/* load r4 with local address */
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lwz r4, 44(r1)
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subi r4, r4, MCOUNT_INSN_SIZE
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/* get the parent address */
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addi r3, r1, 52
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bl prepare_ftrace_return
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nop
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MCOUNT_RESTORE_FRAME
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/* old link register ends up in ctr reg */
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bctr
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_GLOBAL(return_to_handler)
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/* need to save return values */
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stwu r1, -32(r1)
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stw r3, 20(r1)
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stw r4, 16(r1)
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stw r31, 12(r1)
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mr r31, r1
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bl ftrace_return_to_handler
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nop
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/* return value has real return address */
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mtlr r3
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lwz r3, 20(r1)
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lwz r4, 16(r1)
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lwz r31,12(r1)
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lwz r1, 0(r1)
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/* Jump back to real return address */
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blr
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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#endif /* CONFIG_MCOUNT */
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@ -603,7 +603,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
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"1: " PPC_LL "%[old], 0(%[parent])\n"
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"2: " PPC_STL "%[return_hooker], 0(%[parent])\n"
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" li %[faulted], 0\n"
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"3:"
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"3:\n"
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".section .fixup, \"ax\"\n"
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"4: li %[faulted], 1\n"
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