riscv/ftrace: Add basic support

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This patch contains basic ftrace support for RV64I platform.
Specifically, function tracer (HAVE_FUNCTION_TRACER), function graph
tracer (HAVE_FUNCTION_GRAPH_TRACER), and a frame pointer test
(HAVE_FUNCTION_GRAPH_FP_TEST) are implemented following the
instructions in Documentation/trace/ftrace-design.txt.

Note that the functions in both ftrace.c and setup.c should not be
hooked with the compiler's -pg option: to prevent infinite self-
referencing for the former, and to ignore early setup stuff for the
latter.

Signed-off-by: Alan Kao <alankao@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

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Alan Kao 2017-12-18 17:52:48 +08:00 • committed by Palmer Dabbelt

parent 5d44bf2065

commit 10626c32e3

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6 changed files with 189 additions and 1 deletions

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5

arch/riscv/Kconfig

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1

arch/riscv/include/asm/Kbuild

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10

arch/riscv/include/asm/ftrace.h

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7

arch/riscv/kernel/Makefile

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41

arch/riscv/kernel/ftrace.c

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126

arch/riscv/kernel/mcount.S

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