x86/ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL

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The previous patch ("function_graph: Support recording and printing
the return value of function") has laid the groundwork for the for
the funcgraph-retval, and this modification makes it available on
the x86 platform.

We introduce a new structure called fgraph_ret_regs for the x86
platform to hold return registers and the frame pointer. We then
fill its content in the return_to_handler and pass its address
to the function ftrace_return_to_handler to record the return
value.

Link: https://lkml.kernel.org/r/53a506f0f18ff4b7aeb0feb762f1c9a5e9b83ee9.1680954589.git.pengdonglin@sangfor.com.cn

Signed-off-by: Donglin Peng <pengdonglin@sangfor.com.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

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Donglin Peng 2023-04-08 05:42:20 -07:00 • committed by Steven Rostedt (Google)

parent 3646970322

commit d938ba1768

4 changed files with 30 additions and 6 deletions

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1

arch/x86/Kconfig

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20

arch/x86/include/asm/ftrace.h

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8

arch/x86/kernel/ftrace_32.S

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7

arch/x86/kernel/ftrace_64.S

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